JP2009234489A - Vehicular electronic control brake power supply system, and backup power supply charging/discharging method for the same - Google Patents

Abstract

It is an object of the present invention to provide an electronically controlled brake power supply system for vehicles that reduces performance deterioration of an auxiliary power supply.
An alternator for generating a predetermined voltage, a main storage battery connected to be rechargeable by the alternator, an electronically controlled brake to which an operating voltage is supplied by the alternator or the main storage battery, and an electron connected to be rechargeable by the alternator In a vehicle electronically controlled brake power supply system comprising a backup power supply for a control brake, the backup power supply includes a first capacitor charged by an alternator when the vehicle ignition switch is turned on, and the vehicle ignition switch is turned off. And a second capacitor connected in parallel with the first capacitor and receiving and charging a portion of the charge stored in the first capacitor; and To do.
[Selection] Figure 1

Description

  The present invention relates to a vehicle electronic control brake power supply system and a backup power supply charge / discharge method for a vehicle electronic control brake power supply system.

  An electronically controlled brake (ECB) mounted on a vehicle electrically implements brake control related to braking of the vehicle. For this reason, the electronically controlled brake enables flexible and fuzzy brake control regardless of the driver's intention to input the braking operation of the vehicle. On the other hand, the brake control always requires electric energy. There is also a restriction that

  Generally, an alternator (generator) that converts engine driving force or the like into electric energy is mounted on the vehicle. In addition, a battery (main storage battery) that is the main power source for the overall electric energy of the vehicle is also installed. When the alternator is operating normally, the electric energy generated by the alternator is charged and stored in the battery.

  In addition, since the electronically controlled brake of the vehicle cannot obtain a sufficient amount of power generation when the alternator starts to operate or when the alternator is not in operation, the battery can meet the demand for electric energy.

  On the other hand, the electronically controlled brake is required to operate with high reliability regardless of whether the alternator is operating, whether the driver is driving the vehicle or the driver is not driving the vehicle. In other words, even if the battery voltage drops or the alternator breaks down, enough electric energy cannot be obtained from the battery or alternator, the electronically controlled brake is sufficiently reliable and efficient in nature. It is preferable to be able to operate automatically.

  For this reason, the electronic control brake is provided with an auxiliary power source for the electronic control brake that assists the battery. As an auxiliary power source for the electronically controlled brake, for example, a current stabilization circuit using a switching converter using a choke coil is used.

  The switching converter can boost the output voltage of the battery. Therefore, even when the battery is damaged due to overdischarge or the like and the output voltage is lowered, the operating voltage required for the operation of the devices connected to the battery is boosted using the current stabilization circuit. It is possible to secure by.

  In addition, a power supply in which the electric double layer capacitor cell is divided into a plurality of capacitor groups has been proposed. This power supply normally has a plurality of divided capacitor groups connected in parallel. In addition, when the battery fails, a plurality of divided capacitor groups are connected in series to compensate for the voltage drop of the capacitor cell and ensure the output voltage.

Such a power supply device for an electric vehicle is disclosed in, for example, Patent Document 1 below.
JP 2002-125303 A Special table 2007-520187

  However, conventionally known switching converters are not only large and bulky but also heavy. Therefore, it cannot be said that it is suitable as a vehicle-mounted component that requires a reduction in size and weight.

  In addition, when a capacitor is used as an auxiliary power source, there is a concern that the output voltage of the auxiliary power source may decrease due to deterioration of the capacitor itself.

  The present invention has been made in view of the problems as described above, and is capable of supplying a necessary operating voltage with high reliability and power saving. It aims at providing the backup power supply charge / discharge method of a system.

  An electronically controlled brake power supply system for a vehicle according to the present invention includes an alternator that generates a voltage by a power source of a vehicle, a main storage battery that is connected to be rechargeable by the alternator, and an electronic control that is supplied with an operating voltage by the alternator or the main storage battery. In an electronically controlled brake power supply system for a vehicle comprising a brake and a backup power supply for an electronically controlled brake connected in a chargeable manner by an alternator, the backup power supply is charged by the alternator when the ignition switch of the vehicle is turned on. When the ignition switch of the vehicle is turned off, the first capacitor is connected in parallel with the first capacitor and receives a part of the electric charge accumulated in the first capacitor to be charged. And a capacitor.

  The vehicle electronically controlled brake power supply system according to the present invention preferably includes an alternator generation voltage detector for detecting a voltage generated by the alternator, and the backup power supply connects the first capacitor and the second capacitor in parallel. Alternatively, a switching unit that can be switched between series connection and non-connection is provided, and when the ignition switch of the vehicle is turned on, the voltage generated by the alternator detected by the alternator generation voltage detection unit is the operation of the electronically controlled brake. If the voltage is smaller than the voltage, the first capacitor and the second capacitor are connected in series so that the series voltage of the first capacitor and the second capacitor is supplied to the electronic brake, and the alternator generation voltage detector The voltage generated by the detected alternator is the operating voltage of the electronically controlled brake. If larger, the first capacitor and the second capacitor are disconnected, the voltage generated by the alternator is supplied to the first capacitor to charge the first capacitor, and the ignition switch of the vehicle is turned off. In this case, the second capacitor is a switching unit in which the first capacitor and the second capacitor are connected in parallel so that a part of the electric charge stored in the first capacitor is received and charged. It is characterized by.

  Further, the vehicle electronically controlled brake power supply system according to the present invention further preferably includes a main storage battery voltage detection unit that detects the voltage of the main storage battery, and the switching unit is configured to turn off the main switch when the ignition switch of the vehicle is turned on. If the voltage of the main storage battery detected by the storage battery voltage detection unit and the voltage generated by the alternator detected by the alternator generation voltage detection unit are both lower than the operating voltage of the electronically controlled brake, the first capacitor and the second capacitor The first capacitor and the second capacitor are connected in series so that the series voltage is supplied to the electronically controlled brake, and the voltage of the main storage battery detected by the main storage battery voltage detection unit is detected by the alternator generation voltage detection unit. If any of the voltages generated by the alternator that is greater than the operating voltage of the electronically controlled brake is A Yapashita a second capacitor is disconnected, characterized in that the first capacitor is a switching unit for charging the first capacitor by supplying a voltage of the voltage or main battery alternator generates.

  In addition, the vehicle electronically controlled brake power supply system according to the present invention preferably further includes a main storage battery voltage detection unit that detects the voltage of the main storage battery, and the backup power supply detects the charging voltage of the first capacitor. A changeover switch capable of switching the charge voltage detector, the second capacitor charge voltage detector for detecting the charge voltage of the second capacitor, and the first capacitor and the second capacitor to be connected in parallel, connected in series or disconnected. And a switching unit having a main storage battery charge switch that can be connected to charge the main storage battery by a series voltage of the first capacitor and the second capacitor, wherein the ignition switch of the vehicle is turned off. The charging voltage of the first capacitor detected by the first capacitor charging voltage detector If the voltage added to the charging voltage of the second capacitor detected by the capacitor charging voltage detector is larger than the voltage of the main battery detected by the main battery voltage detector, the first capacitor and the second capacitor The main battery charge switch is turned on so that the main battery is charged by the series voltage by the series connection, and the first capacitor charge voltage detected by the first capacitor charge voltage detector and the second capacitor charge voltage detector are detected. If the voltage added to the charge voltage of the second capacitor is not larger than the voltage of the main storage battery detected by the main storage battery voltage detection unit, the second capacitor will remove a part of the charge accumulated in the first capacitor. The switching unit includes a first capacitor and a second capacitor connected in parallel so as to be received and charged.

  Another vehicle electronically controlled brake power supply system according to the present invention includes an alternator that generates a voltage from a power source of the vehicle, a main storage battery that is rechargeably connected by the alternator, and an operating voltage supplied by the alternator or the main storage battery. In a vehicle electronically controlled brake power supply system comprising an electronically controlled brake and a backup power source of an electronically controlled brake connected to be rechargeable by an alternator or a main storage battery, the backup power source can be switched between a parallel connection and a series connection. If either the alternator or the main storage battery fails when the first and second capacitors connected to the vehicle and the ignition switch of the vehicle are turned on, they are fully charged by the alternator or the main storage battery. First capacity to be charged to about half of capacity And the second capacitor are connected in parallel, and if both the alternator and the main storage battery fail, the first voltage is supplied to the electronic brake so that the first capacitor and the second capacitor are connected in series. The switching part which makes a capacitor and a 2nd capacitor connect in series is provided.

  In the vehicle electronically controlled brake power supply system according to the present invention, preferably, the electronically controlled brake power supply system includes a voltage detector that detects a voltage between the alternator and the main storage battery, a first capacitor connected in parallel, and a second capacitor. And a constant voltage supply unit that converts the voltage of the alternator or the main storage battery so as to charge up to about half of the full charge capacity of each of the capacitors, and the switching unit, when the ignition switch of the vehicle is turned on, When it is determined by the voltage detected by the voltage detector that either the alternator or the main storage battery is not in failure, the first capacitor and the second capacitor from the constant voltage supply unit are each half of the full charge capacity. The first capacitor and the second capacitor are connected in parallel so that they are charged to the extent that they are charged. The first capacitor and the second capacitor are connected so as to supply a series voltage of the first capacitor and the second capacitor to the electronically controlled brake when it is determined that both the generator and the main storage battery are in failure. Is a switching unit that is connected in series.

  The vehicle electronically controlled brake power supply system according to the present invention is more preferably characterized in that the capacitance of the first capacitor and the capacitance of the second capacitor are the same.

  Further, a backup power supply / discharge method for a vehicle electronically controlled brake power supply system according to the present invention includes an alternator that generates a voltage by a power source of a vehicle, a main storage battery that is connected to be chargeable by the alternator, and an alternator or a main storage battery. In a backup power supply / discharge method of a vehicle electronic control brake power supply system comprising an electronic control brake to which an operating voltage is supplied and a backup power supply of an electronic control brake connected to be able to be charged by an alternator, the backup power supply is supplied by an alternator A first capacitor to be charged, and a second capacitor to be charged by receiving a part of the electric charge accumulated in the first capacitor when connected in parallel with the first capacitor, When the ignition switch is turned on, the first capacity The first capacitor so that when the ignition switch of the vehicle is turned off, the second capacitor receives and charges a part of the charge accumulated in the first capacitor when the ignition switch of the vehicle is turned off. And a second capacitor connected in parallel.

  Also, in the backup power supply / discharge method of the vehicle electronically controlled brake power supply system according to the present invention, preferably the vehicle electronically controlled brake power supply system includes an alternator generation voltage detection unit that detects a voltage generated by the alternator, and a backup power supply Includes a switching unit capable of switching the first capacitor and the second capacitor in parallel connection, series connection or non-connection, and detects an alternator generation voltage detection unit when a vehicle ignition switch is turned on. In the first voltage comparison step for comparing the voltage generated by the electronic control brake and the operating voltage of the electronically controlled brake, and in the first voltage comparison step, the voltage generated by the alternator generated by the alternator generation voltage detector is electronically controlled. When the operating voltage of the brake is lower, the switching unit In the step of connecting the first capacitor and the second capacitor in series so that the series voltage of the capacitor and the second capacitor is supplied to the electronic brake, and the first voltage comparison step, the alternator generation voltage When the voltage generated by the alternator detected by the detection unit is larger than the operating voltage of the electronically controlled brake, the switching unit disconnects the first capacitor and the second capacitor, and the alternator is connected to the first capacitor. Supplying the voltage to be generated and charging the first capacitor; and when the ignition switch of the vehicle is turned off, the switching unit uses the second capacitor to store a part of the charge accumulated in the first capacitor. A first capacitor and a second capacitor connected in parallel so as to be received and charged

  Further, in the backup power supply / discharge method of the vehicle electronic control brake power system according to the present invention, more preferably, the vehicle electronic control brake power supply system further includes a main storage battery voltage detection unit for detecting the voltage of the main storage battery, When the ignition switch is turned on, the voltage generated by the alternator generated by the alternator generation voltage detector is compared with the operating voltage of the electronic brake, and the voltage of the main battery detected by the main battery voltage detector In the second voltage comparison step for comparing the operation voltage of the electronically controlled brake and the second voltage comparison step, the main storage battery voltage detected by the main storage battery voltage detection unit and the alternator generation voltage detection unit If both the voltage generated by the alternator is smaller than the operating voltage of the electronically controlled brake, the first capacitor The switching unit is configured to connect the first capacitor and the second capacitor in series so that the series voltage of the capacitor and the second capacitor is supplied to the electronic control brake, and in the second voltage comparison step, If either the main storage battery voltage detected by the main storage battery voltage detection unit or the alternator generation voltage detected by the alternator generation voltage detection unit is greater than the operating voltage of the electronic brake, the first capacitor The switching unit includes a step of disconnecting the first capacitor and the second capacitor so as to charge the first capacitor by supplying the voltage generated by the alternator or the voltage of the main storage battery. And

  Further, the backup power supply / discharge method of the vehicle electronically controlled brake power supply system according to the present invention is more preferably provided such that the vehicle electronically controlled brake power supply system includes a main storage battery voltage detection unit for detecting the voltage of the main storage battery, A first capacitor charge voltage detector for detecting a charge voltage of the first capacitor, a second capacitor charge voltage detector for detecting a charge voltage of the second capacitor, the first capacitor and the second capacitor, A switching unit having a changeover switch that can be switched between parallel connection, series connection, and non-connection, and a main storage battery charge switch that can be connected to charge the main storage battery by a series voltage of the first capacitor and the second capacitor When the vehicle ignition switch is turned off, the first capacitor charge voltage detection An addition voltage of the charging voltage of the first capacitor detected by the charging voltage of the second capacitor detected by the second capacitor charging voltage detection unit, the voltage of the main storage battery detected by the main storage battery voltage detection unit, In the third voltage comparison step and the third voltage comparison step, the first capacitor charge voltage detected by the first capacitor charge voltage detector and the second capacitor charge voltage detector detected by the second capacitor charge voltage detector When the voltage added to the charging voltage of the second capacitor is larger than the voltage of the main storage battery detected by the main storage battery voltage detection unit, the switching unit connects the first capacitor and the second capacitor in series. , A step of turning on the main storage battery charging switch so as to charge the main storage battery with the series voltage of the first capacitor and the second capacitor, and a third voltage comparison The added voltage of the charging voltage of the first capacitor detected by the first capacitor charging voltage detector and the charging voltage of the second capacitor detected by the second capacitor charging voltage detector is the main storage battery voltage detection. So that the second capacitor receives and charges a part of the charge stored in the first capacitor when the voltage is not larger than the voltage of the main storage battery detected by the unit. And a second capacitor connected in parallel, and a step of turning off the main battery charging switch.

  In addition, another backup power source charging / discharging method for a vehicle electronically controlled brake power system according to the present invention includes an alternator that generates a voltage from a power source of a vehicle, a main storage battery that is rechargeably connected by the alternator, an alternator or a main In a backup power supply / discharge method of a vehicle electronic control brake power supply system comprising: an electronic control brake to which an operating voltage is supplied by a storage battery; and a backup power supply of an electronic control brake connected to be rechargeable by an alternator or a main storage battery. The backup power supply of the control brake is connected to the first capacitor and the second capacitor connected in a switchable manner between the parallel connection and the series connection, and the first capacitor and the second capacitor are switched to the parallel connection or the series connection. Vehicle switching When either of the alternator and the main storage battery is not faulty when the switch is turned on, the switching unit is configured so that the alternator or the main storage battery is charged to about half of the full charge capacity. If both the step of connecting the first capacitor and the second capacitor in parallel and the alternator and the main storage battery fail, the series voltage of the first capacitor and the second capacitor is supplied to the electronic brake. Thus, the switching unit includes a step of connecting the first capacitor and the second capacitor in series.

  Also, the backup power supply / discharge method of the vehicle electronically controlled brake power supply system according to the present invention is preferably configured such that the electronically controlled brake power supply system detects a voltage between the alternator and the main storage battery, and the alternator or the main storage battery. A constant voltage supply unit that converts the voltage so that the first capacitor and the second capacitor connected in parallel are each charged to about half the full charge capacity, and the ignition switch of the vehicle is turned on. In this case, either the alternator or the main storage battery is determined by the failure determination step for determining whether or not both the alternator and the main storage battery are failed based on the voltage detected by the voltage detection unit. When it is determined that there is no failure, set the first capacitor and the second capacitor from the constant voltage supply unit to about half of the full charge capacity. When the switching unit determines that both the alternator and the main storage battery are in failure by the step of connecting the first capacitor and the second capacitor in parallel and the failure determination step so as to charge at In addition, the switching unit includes a step of connecting the first capacitor and the second capacitor in series so as to supply a series voltage of the first capacitor and the second capacitor to the electronic control brake. Features.

  Further, the backup power supply charging / discharging method for the vehicle electronically controlled brake power supply system according to the present invention is more preferably characterized in that the capacitance of the first capacitor and the capacitance of the second capacitor are the same. To do.

  According to the present invention, an electronically controlled brake power supply system for a vehicle that reduces the performance deterioration of the auxiliary power supply can be obtained. In addition, an energy-saving electronically controlled brake power supply system for vehicles that suppresses energy loss can be obtained. Moreover, it can be set as the vehicle electronically controlled brake power supply system etc. which can back up power quickly.

  The vehicle electronically controlled brake power supply system exemplified in the first embodiment includes two capacitor groups of first and second as backup power supplies (auxiliary power supplies). The first capacitor group is typically fully charged to 12V by an alternator or a main storage battery (battery) when the ignition switch of the vehicle is on. As a result, the first capacitor group fully charged to 12 V serves as a backup power source for the electronically controlled brake when the vehicle is running.

  Specifically, in the vehicle electronically controlled brake power supply system, during normal driving of the vehicle, the alternator functions normally to generate and output a voltage of approximately 12 V or more, and the main storage battery also requires an output voltage (for example, 12V) is maintained. Therefore, during normal driving of such a vehicle, the operation voltage necessary for the brake operation is supplied to the vehicle electronic control brake from the alternator or the main storage battery. The output voltage of the alternator or the main storage battery is also supplied to the first capacitor group provided in the backup power supply, and the first capacitor group is substantially fully charged to about 12V.

  The second capacitor group is connected in parallel with the first capacitor group when the ignition switch of the vehicle is off. The second capacitor group is charged by the first capacitor group by receiving a part of the electric charge corresponding to the voltage charged in the first capacitor group. The first capacitor group and the second capacitor group typically have the same full charge capacity (e.g., equivalent to 12V voltage).

  As a result, the electronically controlled brake power supply system for a vehicle has an electrical energy equivalent to a voltage of about 12V that is fully charged in the first capacitor group when the ignition switch of the vehicle is turned on (typically when the vehicle is running). Is divided and applied to the second capacitor group when the ignition switch of the vehicle is off (typically when the vehicle is stopped).

  Therefore, when the ignition switch of the vehicle is off, the first capacitor group and the second capacitor group each store electric energy corresponding to a voltage of about 6V corresponding to about half of the full charge of about 12V. Become.

  Here, the performance of capacitors generally tends to deteriorate when fully charged (for example, 12 V), which is the withstand voltage limit, and deteriorates when half charged (for example, 6 V), which is about half of the withstand voltage limit. It is known that it tends to be difficult.

  The vehicle electronically controlled brake power supply system exemplified in the embodiment maintains the first capacitor group and the second capacitor group in a substantially half-charged state when the ignition switch of the vehicle is off. Therefore, the electronically controlled brake power supply system for vehicles can reduce the performance deterioration of the capacitor of the backup power supply even when the vehicle is parked for a long period of time.

  In addition, the vehicle electronically controlled brake power supply system is fully charged to the first capacitor group as conventionally performed in order to reduce the performance deterioration of the first capacitor group when the ignition switch of the vehicle is off. There is no need to wastely discharge power through a resistor. For this reason, the electronically controlled brake power supply system for vehicles illustrated in the embodiment is an energy-saving and highly energy-efficient electronically controlled brake power supply system for vehicles. Moreover, the vehicle electronically controlled brake power supply system exemplified in the embodiment is an eco-friendly ecosystem.

  On the other hand, an electronically controlled brake power supply system for vehicles supplies a voltage (typically about 12V typically) required for the operation of the electronically controlled brake from the first capacitor group provided in the backup power supply when the alternator or the main storage battery fails. To do. Thereby, this vehicle electronically controlled brake power supply system can ensure the operation of the electronically controlled brake with high reliability even in the event of an emergency.

  Further, immediately after the ignition switch of the vehicle is turned on, there is a concern that the alternator is generally starting up and is not functioning sufficiently. In addition, immediately after the ignition switch of the vehicle is turned on, a large amount of electric power is required for starting up the initial operation of other devices, and there is a concern that the output voltage of the main storage battery may temporarily decrease.

  For this reason, the vehicle electronically controlled brake power supply system exemplified in the embodiment preferably supplies the voltage of the backup power source to the electronically controlled brake immediately after the ignition switch of the vehicle is turned on. Specifically, the electronically controlled brake power supply system for a vehicle connects a first capacitor group and a second capacitor group included in the backup power supply in series immediately after the ignition switch of the vehicle is turned on.

  Then, immediately after the ignition switch of the vehicle is turned on, the vehicle electronic control brake power supply system supplies the electronic control brake with the series voltage of the first capacitor group and the second capacitor group. As a result, the electronically controlled brake power supply system for a vehicle can ensure the operation of the electronically controlled brake even immediately after the ignition switch of the vehicle is turned on, so that the electronically controlled brake system becomes more reliable. .

  Also, the vehicle electronically controlled brake power supply system is in a half-charged state in which the first capacitor group is typically charged with approximately 6V of electrical energy immediately before the vehicle ignition switch is turned on. Yes. For this reason, the electronically controlled brake power supply system for a vehicle sets the first capacitor group to a fully charged state necessary for operating the electronically controlled brake after the vehicle ignition switch is turned on. , Not much time.

  For example, the vehicle electronically controlled brake power supply system exemplified in the embodiment, even if it takes about 2 minutes to fully charge the first capacitor group that is normally not charged to 12V, In order to fully charge the first capacitor group to 12V, this can be done in a short time. Therefore, after the ignition switch of the vehicle is turned on, the electronic control brake power supply system for a vehicle that can quickly start backup of the electronic control brake can be obtained by the first capacitor group that is quickly fully charged.

  Therefore, the first embodiment will be described in detail below based on the drawings. In the following description, the first capacitor and the second capacitor are assumed to be a group of capacitors each including one or a plurality of capacitors, unless otherwise specified.

(First embodiment)
A configuration outline of an electronically controlled brake power supply system 100 for a vehicle exemplified in the first embodiment will be described with reference to FIG. FIG. 1 is a conceptual block diagram of a configuration of an electronically controlled brake power supply system 100 for a vehicle. In the following description, unless otherwise noted, switching on corresponds to short-circuiting and switching off corresponds to opening.

  As shown in FIG. 1, an electronically controlled brake power supply system 100 for a vehicle includes an ignition switch 1 that serves as a trigger for starting an engine of a vehicle or starting a power supply system. The vehicle electronically controlled brake power supply system 100 includes an alternator 2 that generates electric power by the driving force of the activated engine and the like, and a main storage battery 3 that is connected to the alternator 2 so as to be rechargeable. The main storage battery 3 is a storage battery that serves as a main power source for the entire vehicle.

  The vehicle electronically controlled brake power supply system 100 includes an alternator generation voltage detection unit 15 that detects a voltage generated by the alternator 2. The vehicle electronically controlled brake power supply system 100 includes a main storage battery voltage detection unit 16 that detects the voltage of the main storage battery 3.

  The vehicle electronically controlled brake power supply system 100 includes an electronically controlled brake (ECB) 5 that is operated by a voltage supplied from the alternator 2 and the main storage battery 3 via the battery line 4 in a normal state. Further, the vehicle electronic control brake power supply system 100 includes a backup power supply 6 in order to stably supply the operating voltage of the electronic control brake 5.

  The backup power source 6 includes a first capacitor 7 that serves as a backup power source when the ignition switch 1 is mainly turned on. The backup power supply 6 includes a second capacitor 8 that reduces the voltage of the first capacitor 7 by receiving the charge of the first capacitor 7 mainly when the ignition switch 1 is turned off. It is assumed that the first capacitor 7 and the second capacitor 8 typically have the same capacitance, and have a voltage of about 12 V when fully charged.

  In addition, the vehicle electronic control brake power supply system 100 includes a first capacitor charging voltage detection unit 18 that detects a voltage charged in the first capacitor 7. The vehicle electronically controlled brake power supply system 100 includes a second capacitor charging voltage detection unit 19 that detects a voltage charged in the second capacitor 8.

  The first capacitor 7 and the second capacitor 8 are controlled by the switching unit 9 to be switched between serial connection, parallel connection, and non-connection. The switching unit 9 includes a changeover switch 10 that switches the first capacitor 7 and the second capacitor 8 between series connection, parallel connection, and non-connection. The changeover switch 10 also includes a terminal B that connects the first capacitor 7 and the second capacitor 8 in series, and a terminal A that connects the first capacitor 7 and the second capacitor 8 in parallel. .

  In addition, the switching unit 9 includes a ground switch 11 that connects a portion where the first capacitor 7 is connected to the terminal B side of the changeover switch 10 to the ground. In addition, the switching unit 9 includes a main storage battery charging switch 12 that bypasses a portion where the first capacitor 7 and the second capacitor 8 are connected to the terminal A side of the changeover switch 10 with the main storage battery.

  Moreover, the switching part 9 is provided with the switch control part 13 which controls the changeover switch 10, the ground switch 11, and the main storage battery charge switch 12, respectively. Further, the switch control unit 13 adds the voltage detected by the first capacitor charging voltage detection unit 18 and the voltage detected by the second capacitor charging voltage detection unit 19, so that the first capacitor 7 and the second capacitor 8 are added. The voltage addition part 17 which calculates the serial voltage with is provided.

  The switch control unit 13 includes an electronic control brake operation voltage storage unit 20 in which an operation voltage necessary for the operation of the electronic control brake 5 is stored in advance. The operating voltage required for the electronically controlled brake 5 stored in the electronically controlled brake operating voltage storage unit 20 is typically 12V.

  Further, the switch control unit 13 includes a series voltage of the first capacitor 7 and the second capacitor 8 calculated by the voltage addition unit 17, a voltage detected by the alternator generation voltage detection unit 15, and a main storage battery voltage detection unit 16. Is provided with a voltage comparison unit 14 for comparing each of the voltage detected in step 1 and the operation voltage of the electronic control brake 5 stored in the electronic control brake operation voltage storage unit 20. Then, the switch control unit 13 switches and controls the changeover switch 10, the ground switch 11, and the main storage battery charging switch 12 based on the result of comparison by the voltage comparison unit 14, and the like.

  The vehicle electronically controlled brake power supply system 100 having the above-described configuration can appropriately switch the connection between the first capacitor 7 and the second capacitor 8. Then, by appropriately switching the connection between the first capacitor 7 and the second capacitor 8, the time for which the first capacitor 7 is held in a fully charged state is reduced without impairing the function of the backup power source 6. . As a result, the performance degradation of the first capacitor 7 can be suppressed, and the vehicle electronic control brake power supply system 100 including the backup power supply 6 having a long life and high reliability can be obtained.

  In addition, when the ignition switch 1 is off, the vehicle electronically controlled brake power supply system 100 can hold the first capacitor 7 in a half-charged state (typically 6 V), so that the ignition switch 1 is on. Sometimes the charging time until the first capacitor 7 is fully charged is short. For this reason, since the backup power supply 6 can start backup quickly, the vehicular electronic control brake power supply system 100 is a safer system.

  Next, an operation sequence in which the switch control unit 13 controls the changeover switch 10, the ground switch 11, and the main storage battery charging switch 12 will be described with reference to FIG. FIG. 2 is a diagram illustrating an operation sequence of the changeover switch 10, the ground switch 11, and the main storage battery charging switch 12.

  2A, the ignition switch 1 (IG) is turned on, the changeover switch 10 (SW10) is turned off, the ground switch 11 (SW11) is turned on, and the main storage battery charging switch 12 is turned on. (SW12) is turned off. Therefore, in the period T1, only the first capacitor 7 is charged from the alternator 2 or the main storage battery 3.

  In the period T1, the first capacitor 7 is charged to a full charge of about 12V. The first capacitor 7 serves as a backup power source for the electronic control brake 5 in the unlikely event that the output voltage necessary for the operation of the electronic control brake 5 cannot be obtained from the alternator 2 and the main storage battery 3. An operating voltage of 12V is output.

  Next, in the period T2, the ignition switch 1 (IG) is off, the changeover switch 10 (SW10) is on (terminal A side), the ground switch 11 (SW11) is on, and the main storage battery charge switch 12 (SW12) is off. It becomes. Therefore, in the period T2, a part of the electric charge corresponding to the voltage of about 12V fully charged in the first capacitor 7 moves to the second capacitor 8 connected in parallel with the first capacitor 7. Therefore, in the period T2, the voltages of the first capacitor 7 and the second capacitor 8 are equal, and both are approximately 6V.

  In other words, even when the ignition switch 1 is turned off, the vehicle electronically controlled brake power supply system 100 does not need to forcibly discharge the electrical energy of the first capacitor 7 through the resistor and discard it. In addition, even when the ignition switch 1 is turned off, the vehicle electronic control brake power supply system 100 causes the first capacitor 7 and the second capacitor 8 to be in a substantially half charged state by the switch control as shown in the period T2. Maintained. For this reason, the vehicle electronic control brake power supply system 100 can suppress the deterioration of the first capacitor 7 and the second capacitor 8.

  Next, in the period T3, the ignition switch 1 (IG) is turned off, the changeover switch 10 (SW10) is turned off, the ground switch 11 (SW11) is turned on, and the main storage battery charging switch 12 (SW12) is turned off. As a result, the first capacitor 7 and the second capacitor 8 are disconnected, and the first capacitor 7 and the second capacitor 8 are each kept in a half-charged state independently. The first capacitor 7 and the second capacitor 8 may have a slight voltage drop due to natural discharge over time.

  Next, in the period T4, the vehicle electronic control brake power supply system 100 performs the same switch control as in the period T1. That is, in the period T4 of the operation sequence illustrated in FIG. 2A, the ignition switch 1 (IG) is turned on (short circuit), the changeover switch 10 (SW10) is turned off (opened), and the ground switch 11 (SW11) is turned on. (Short circuit), the main storage battery charging switch 12 (SW12) is turned off (opened).

  Here, the voltage of about 6 V is maintained in the first capacitor 7 in the period T4 in a substantially half-charged state continuously from the period T3. For this reason, after the ignition switch 1 (IG) is turned on in the period T4, the first capacitor 7 is charged almost instantaneously to about 12V of full charge. When the voltage of the first capacitor 7 is 0 V that is not charged at all, it usually takes about 2 minutes to charge to about 12 V, which is fully charged.

  Further, since the electronic control brake 5 has an operating voltage of about 12V required to start normal operation, a backup voltage for operating the electronic control brake 5 with high reliability and reliability is also required to be about 12V or more. is there. As described above, the vehicular electronically controlled brake power supply system 100 can start backup of the electronically controlled brake 5 quickly by quickly charging the first capacitor 7.

  In addition, in the period T5 of the operation sequence illustrated in FIG. 2B, the ignition switch 1 (IG) is on, the changeover switch 10 (SW10) is on (terminal B side), the ground switch 11 (SW11) is off, The main battery charging switch 12 (SW12) is turned off. Therefore, in the period T5, the first capacitor 7 and the second capacitor 8 are connected in series.

  In the period T5, the series voltage of the first capacitor 7 and the second capacitor 8 connected in series is approximately 12V as described above. Further, this series voltage of about 12V is supplied to the electronic control brake 5 only for the period T5 immediately after the ignition switch 1 is turned on. Immediately after the ignition switch 1 is turned on, generally a large amount of electric energy is required for starting up the electronic devices of the vehicle. Further, immediately after the ignition switch 1 is turned on, there is a concern that the output voltage of the alternator 2 is not sufficient because the engine is also starting up.

  Therefore, immediately after the ignition switch 1 is turned on, there is a concern that the operating voltage of about 12 V required for the operation of the electronic control brake 5 is not sufficiently supplied from the alternator 2 and the main storage battery 3 to the electronic control brake 5. The As described above, the electronic control brake power supply system 100 for a vehicle has a first capacitor 7 and a second capacitor 8 that are about 12V in the electronic control brake 5 in the period T5 immediately after the ignition switch 1 is turned on. Supply a series voltage with. As a result, the vehicle electronic control brake power supply system 100 can ensure a stable operation of the electronic control brake 5 immediately after the ignition switch 1 is turned on.

  Next, in the period T6, the ignition switch 1 (IG) is turned on, the changeover switch 10 (SW10) is turned off, the ground switch 11 (SW11) is turned on, and the main storage battery charging switch 12 (SW12) is turned off. Therefore, in the period T6, only the first capacitor 7 is charged from the alternator 2 or the main storage battery 3.

  In the period T6, the first capacitor 7 is rapidly charged to a full charge of about 12V. The first capacitor 7 serves as a backup power source for the electronic control brake 5 in the unlikely event that the output voltage necessary for the operation of the electronic control brake 5 cannot be obtained from the alternator 2 and the main storage battery 3 and is about 12V. The operating voltage is output.

  Next, in the period T7, the ignition switch 1 (IG) is turned off, the changeover switch 10 (SW10) is turned on (terminal A side), the ground switch 11 (SW11) is turned on, and the main storage battery charging switch 12 (SW12) is turned off. It becomes. Therefore, in the period T7, a part of the electric charge corresponding to a voltage of about 12V fully charged in the first capacitor 7 moves to the second capacitor 8 connected in parallel with the first capacitor 7. To do. Therefore, in the period T7, the voltages of the first capacitor 7 and the second capacitor 8 are equal, and both are approximately 6V.

  In other words, even when the ignition switch 1 is turned off, the vehicle electronically controlled brake power supply system 100 does not need to discard the electrical energy of the first capacitor 7 by forced discharge through the resistor. In addition, even when the ignition switch 1 is turned off, the vehicle electronic control brake power supply system 100 causes the first capacitor 7 and the second capacitor 8 to be in the half-charged state by the switch control as shown in the period T7. Therefore, deterioration of the first capacitor 7 and the second capacitor 8 can be suppressed.

  Next, in the period T8, the ignition switch 1 (IG) is turned off, the changeover switch 10 (SW10) is turned off, the ground switch 11 (SW11) is turned on, and the main storage battery charging switch 12 (SW12) is turned off. Thereby, the 1st capacitor 7 and the 2nd capacitor 8 are disconnected, and the 1st capacitor 7 and the 2nd capacitor 8 are held as a half charge state separately, respectively. Note that the first capacitor 7 and the second capacitor 8 each have a slight voltage drop due to natural discharge over time.

  In addition, the electronic control brake power supply system 100 for a vehicle uses the first capacitor 7 when the electronic control brake 5 does not require a backup power supply (for example, when parking and typically the ignition switch 1 is off). And the second capacitor 8 can be recovered in the main storage battery 3.

  Therefore, an operation process for recovering the electric energy of the first capacitor 7 and the second capacitor 8 in the main storage battery 3 will be described below with reference to FIG. FIG. 3 is a diagram illustrating an operation sequence of the switches when the electric energy is recovered in the electronically controlled brake power supply system 100 for the vehicle.

  In the period T9 of the operation sequence illustrated in FIG. 3A, the vehicular electronically controlled brake power supply system 100 performs the same switch operation as the above-described T1, and thus the description thereof is omitted here.

  Next, in the period T10, the ignition switch 1 (IG) is off, the changeover switch 10 (SW10) is on (terminal B side), the ground switch 11 (SW11) is off, and the main storage battery charge switch 12 (SW12) is on. It becomes. Accordingly, in the period T10, the first capacitor 7 and the second capacitor 8 are connected in series.

  In the period T10, the series voltage of the first capacitor 7 and the second capacitor 8 connected in series is typically about 12V + 6V and about 18V. Further, a part of the electric energy corresponding to the series voltage of about 18V is recovered in the main storage battery 3 only during the period T10 after the ignition switch 1 is turned off. As a result, the vehicle electronic control brake power supply system 100 does not waste the electrical energy remaining in the first capacitor 7 and the second capacitor 8 after the ignition switch 1 is turned off. And can.

  In addition, by charging the main storage battery 3 in the period T <b> 10, the series voltage of the first capacitor 7 and the second capacitor 8 is reduced to about 12 V, which is the same as that of the main storage battery 3. In addition, the first capacitor 7 and the second capacitor 8 typically have the same capacitance, and hence the same voltage drop occurs.

  For example, the first capacitor 7 is assumed to drop in voltage from about 12V fully charged to about 9V by charging the main storage battery 3 in the period T10. The second capacitor 8 is assumed to drop in voltage from about 6V to about 3V by charging the main storage battery 3 in the period T10.

  Next, in the period T11, the vehicular electronically controlled brake power supply system 100 performs the same switch operation as that of the above-described T2, and thus the description thereof is omitted here.

  In addition, in the period T12 of the operation sequence illustrated in FIG. 3B, the ignition switch 1 (IG) is on, the changeover switch 10 (SW10) is on (terminal B side), the ground switch 11 (SW11) is off, The main battery charging switch 12 (SW12) is turned off. Therefore, in the period T12, the first capacitor 7 and the second capacitor 8 are connected in series.

  In the period T12, the series voltage of the first capacitor 7 and the second capacitor 8 connected in series is about 12V as described above. Further, a series voltage of about 12V is supplied to the electronic control brake 5 only during the period T12 immediately after the ignition switch 1 is turned on. Immediately after the ignition switch 1 is turned on, generally a large amount of electric energy is required for starting up the electronic devices of the vehicle. Further, immediately after the ignition switch 1 is turned on, there is a concern that the output voltage of the alternator 2 is not sufficient due to the engine being in a starting operation or the like.

  Therefore, immediately after the ignition switch 1 is turned on, there is a concern that the operating voltage of about 12 V required for the operation of the electronic control brake 5 is not supplied from the alternator 2 and the main storage battery 3 to the electronic control brake 5. In the period T12 immediately after the ignition switch 1 is turned on, the vehicle electronically controlled brake power supply system 100 is connected to the electronically controlled brake 5 with the first capacitor 7 and the second capacitor 8 having approximately 12V as described above. Supply series voltage. As a result, the vehicle electronic control brake power supply system 100 can ensure a stable operation of the electronic control brake 5 immediately after the ignition switch 1 is turned on.

  In addition, after the ignition switch 1 is turned on, the vehicle electronic control brake power supply system 100 is configured so that the output voltage of the alternator generation voltage detection unit 15 or the main battery voltage detection unit 16 becomes equal to or higher than the operating voltage of the electronic control brake 5. The switch operation in the period T12 can be switched to the switch operation shown in the period T13. In addition, the vehicle electronic control brake power supply system 100 may switch the switch operation in the period T12 to the switch operation shown in the period T13 after a predetermined time has elapsed after the ignition switch 1 is turned on. In this case, it is preferable from the viewpoint of the stable operation of the electronically controlled brake 5 to perform the switch operation shown in the period T13 after a predetermined time required for the initial operation of the alternator 2 has elapsed.

  Next, in the period T13, the ignition switch 1 (IG) is turned on, the changeover switch 10 (SW10) is turned off, the ground switch 11 (SW11) is turned on, and the main storage battery charging switch 12 (SW12) is turned off. Accordingly, in the period T13, only the first capacitor 7 is charged from the alternator 2 or the main storage battery 3.

  In the period T13, the first capacitor 7 is rapidly charged to a full charge of about 12V. The first capacitor 7 serves as a backup power source for the electronic control brake 5 in the unlikely event that the output voltage necessary for the operation of the electronic control brake 5 cannot be obtained from the alternator 2 and the main storage battery 3, and is approximately 12V. The operating voltage is output.

  Next, in the period T14, the ignition switch 1 (IG) is off, the changeover switch 10 (SW10) is on (terminal B side), the ground switch 11 (SW11) is off, and the main storage battery charge switch 12 (SW12) is on. It becomes. Accordingly, in the period T14, the first capacitor 7 and the second capacitor 8 are connected in series.

  In the period T14, the series voltage of the first capacitor 7 and the second capacitor 8 connected in series is typically 12V + 6V and about 18V. Further, a part of the electric energy corresponding to the series voltage of about 18V is recovered by the main storage battery 3 only during the period T14 after the ignition switch 1 is turned off.

  As a result, the vehicle electronically controlled brake power supply system 100 does not waste the electrical energy remaining in the first capacitor 7 and the second capacitor 8 after the ignition switch 1 is turned off. Power system.

  In addition, by charging the main storage battery 3 in the period T <b> 14, the series voltage of the first capacitor 7 and the second capacitor 8 is reduced to about 12 V, which is the same as that of the main storage battery 3. Moreover, since the first capacitor 7 and the second capacitor 8 typically have the same capacitance, it is assumed that the same voltage drop occurs.

  The first capacitor 7 is assumed to drop in voltage from about 12V to about 9V, for example, by charging the main storage battery 3 in the period T14. Further, the second capacitor 8 is assumed to drop in voltage from about 6V to about 3V, for example, by charging the main storage battery 3 in the period T14.

  The vehicle electronically controlled brake power supply system 100 performs the switch operation shown in the period T14 until the output voltage of the main storage battery 3 and the series voltage of the first capacitor 7 and the second capacitor 8 become equal. The main storage battery 3 is charged. Specifically, the vehicle electronically controlled brake power supply system 100 adds the output voltage of the main storage battery voltage detector 16 and the voltage detected by the first capacitor charge voltage detector 18 and the second capacitor charge voltage detector 19. While the voltage is equal or the output voltage of the main storage battery voltage detection unit 16 is low, the main storage battery 3 is charged by the switch operation shown in the period T14. Note that while the first capacitor 7 and the second capacitor 8 are connected in series, the first capacitor 7 and the second capacitor 8 are controlled by the voltage detected by the first capacitor charging voltage detector 18. The series voltage may be detected. In this case, the voltage adding unit 17 may cause the voltage comparing unit 14 to pass through the voltage detected by the first capacitor charging voltage detecting unit 18 without performing the adding process.

  Next, in the period T15, the vehicular electronically controlled brake power supply system 100 performs the same switch operation as that of the above-described T2, and thus the description thereof is omitted here.

  Next, the operation of the vehicle electronic control brake power supply system 100 will be described in detail with reference to FIG. FIG. 4 is a schematic diagram showing an operation flow of the electronically controlled brake power supply system 100 for a vehicle. Hereinafter, description will be made sequentially according to the steps shown in FIG. The operation flow described below corresponds to the switch control flow shown in FIG.

(Step S41)
The vehicle electronic control brake power supply system 100 determines whether or not the ignition switch 1 is turned on. The ignition switch 1 is a switch that activates an electronic device of the entire vehicle and activates an engine. If the ignition switch 1 is turned on, the process proceeds to step S42. If the ignition switch 1 is not turned on, the process waits in step S41.

(Step S42)
The voltage comparison unit 14 of the switch control unit 13 includes the output voltage detected by the alternator generation voltage detection unit 15 or the main storage battery voltage detection unit 16 and the electronic control brake 5 recorded in advance in the electronic control brake operation voltage storage unit 20. Compare the operating voltage required for operation. Then, as a result of the comparison by the voltage comparison unit 14, the output voltage detected by the alternator generation voltage detection unit 15 or the main storage battery voltage detection unit 16 is recorded in the electronic control brake operation voltage storage unit 20 in advance. If it is greater than the operating voltage required for operation, the process proceeds to step S43.

  Further, as a result of the comparison by the voltage comparison unit 14, the output voltage detected by the alternator generation voltage detection unit 15 or the main storage battery voltage detection unit 16 is stored in the electronic control brake operation voltage storage unit 20 in advance. If it is not greater than the operating voltage required for operation, the process proceeds to step S48.

(Step S43)
The switch control unit 13 does not connect the changeover switch 10 to the terminal A or the terminal B, and disconnects the first capacitor 7 and the second capacitor 8. Since the switch controller 13 disconnects the first capacitor 7 and the second capacitor 8, the second capacitor 8 is disconnected from the battery line 4, so that it is not newly charged. .

  Further, since the switch controller 13 disconnects the first capacitor 7 and the second capacitor 8, the second capacitor 8 is disconnected from the first capacitor 7. No charge of 7 will be received. At this time, the switch controller 13 turns on the ground switch 11 (closes) and turns off the main storage battery charging switch 12 (opens).

(Step S44)
The first capacitor 7 is charged to approximately 12 V by the output voltage of the alternator 2 or the main storage battery 3 via the battery line 4. As illustrated in FIG. 1, the first capacitor 7 can supply an operating voltage to the electronic control brake 5 as long as the ignition switch 1 is turned on (closed). For this reason, the voltage of approximately 12 V charged in the first capacitor 7 becomes the backup power supply voltage of the electronic control brake 5. In addition, when the 1st capacitor 7 is a half charge state, it can charge to about 12V full charge instantly.

(Step S45)
If the alternator 2 has no failure such as power generation failure and typically an output voltage of about 12V or more is output to the battery line 4, the process proceeds to step S46. When the alternator 2 has no failure such as a power generation failure, specifically, for example, the voltage detected by the voltage comparison unit 14 by the alternator generation voltage detection unit 15 and the electronic control brake operation voltage storage unit 20 are stored. It can be determined by comparing the operating voltage required for the operation of the electronically controlled brake 5. The switch control unit 13 is an operation necessary for the operation of the electronic control brake 5 in which the voltage detected by the alternator generation voltage detection unit 15 is stored in the electronic control brake operation voltage storage unit 20 based on the comparison result of the voltage comparison unit 14. If it is larger than the voltage, it can be determined that there is no failure.

  Further, the switch control unit 13 compares the voltage detected by the alternator generation voltage detection unit 15 with the voltage comparison unit 14 as to whether or not the predetermined voltage is about 12V or more. It can be judged that there is no failure. Further, the alternator generation voltage detection unit 15 is not limited to that illustrated in FIG. 1, and may be provided at any location of the battery line 4.

  Further, when the main storage battery 3 has no failure such as terminal disconnection and typically an output voltage of about 12 V or more is output to the battery line 4, the process proceeds to step S46. When the main storage battery 3 has no failure such as terminal disconnection, specifically, the voltage detected by the voltage comparison unit 14 by the main storage battery voltage detection unit 16 and the electronic control brake operation voltage storage unit 20 are stored. It can be determined by comparing the operating voltage required for the operation of the electronically controlled brake 5. The switch control unit 13 is an operation necessary for the operation of the electronic control brake 5 in which the voltage detected by the main storage battery voltage detection unit 16 is stored in the electronic control brake operation voltage storage unit 20 based on the comparison result of the voltage comparison unit 14. If it is larger than the voltage, it can be determined that there is no failure.

  Further, the switch control unit 13 compares the voltage detected by the main storage battery voltage detection unit 16 with the voltage comparison unit 14 to determine whether or not the voltage is approximately 12V or more of the predetermined voltage. It can be judged that there is no fall. Moreover, the main storage battery voltage detection part 16 is not restricted to what is illustrated in FIG. 1, You may provide in the arbitrary locations of the battery line 4. FIG.

  Further, there is a failure such as a power generation failure in the alternator 2, typically when an output voltage of about 12 V or more is not output to the battery line 4, or there is a failure such as a terminal disconnection in the main storage battery 3, Typically, when an output voltage of approximately 12 V is not output to the battery line 4, the process proceeds to step S4a.

(Step S46)
The switch control unit 13 determines whether or not the ignition switch 1 is turned off (opened). If the ignition switch 1 is turned off (opened), the process proceeds to step S47. If the ignition switch 1 is not turned off (opened), the process returns to step S45.

(Step S47)
The switch control unit 13 connects the first capacitor 7 and the second capacitor 8 in parallel. If the switch control unit 13 connects the first capacitor 7 and the second capacitor 8 in parallel, the second capacitor 8 is caused by a part of the charge equivalent to about 12V charged in the first capacitor 7. Is charged. The charging voltages of the first capacitor 7 and the second capacitor 8 are equal to each other and become approximately 6V. As a result, both the first capacitor 7 and the second capacitor 8 are in a substantially half-charged state, so that it is possible to prevent the occurrence of deterioration of the capacitor that is known to occur in the fully charged state.

  Specifically, the switch control unit 13 connects the changeover switch 10 to the terminal A. At this time, the switch control unit 13 turns on (closes) the ground switch 11 and turns off (opens) the main storage battery charging switch 12.

(Step S48)
The switch control unit 13 connects the first capacitor 7 and the second capacitor 8 in series. Specifically, the switch control unit 13 connects the changeover switch 10 to the terminal B side. At this time, the switch control unit 13 turns off (opens) the ground switch 11 and turns off (opens) the main storage battery charging switch 12.

(Step S49)
The vehicle electronic control brake power supply system 100 supplies a series voltage of the first capacitor 7 and the second capacitor 8 to the electronic control brake 5. Since the series voltage of the first capacitor 7 and the second capacitor 8 is approximately 12 V, it can be the operating voltage of the electronic control brake 5.

  Therefore, in the vehicle electronic control brake power supply system 100, the output voltage supplied from the alternator 2 or the main storage battery 3 to the battery line 4 is temporarily lower than 12V immediately after the ignition switch 1 is turned on in step S41. Even if the situation arises, the operating voltage of the electronic control brake 5 can be continuously supplied.

(Step S4a)
The backup power supply 6 supplies the electronic control brake 5 with a voltage of approximately 12 V fully charged in the first capacitor 7. As a result, the vehicle electronic control brake power supply system 100 can stably supply the operation voltage necessary for the operation of the electronic control brake 5 even when the alternator 2 or the main storage battery 3 fails.

  Next, the electric energy recovery operation of the vehicle electronic control brake power supply system 100 will be described in detail with reference to FIG. FIG. 5 is a schematic diagram showing an electric energy recovery operation flow of the vehicle electronically controlled brake power supply system 100. Hereinafter, description will be made sequentially according to the steps shown in FIG. The operation flow described below corresponds to the switch control flow shown in FIG.

(Step S51)
The vehicle electronically controlled brake power supply system 100 determines whether the ignition switch 1 is on (closed). The ignition switch 1 is a switch that activates an electronic device of the entire vehicle and activates an engine. If the ignition switch 1 is turned on (closed), the process proceeds to step S52. If the ignition switch 1 is not turned on (closed), the process waits in step S51.

(Step S52)
The switch control unit 13 connects the first capacitor 7 and the second capacitor 8 in series. Specifically, the switch control unit 13 connects the changeover switch 10 to the terminal B side. Further, the switch control unit 13 turns off the ground switch 11 (opens) and turns off (opens) the main storage battery charging switch 12.

  Further, the switch controller 13 may automatically and quickly connect the first capacitor 7 and the second capacitor 8 in series when the ignition switch 1 is turned on (closed) in step S51.

  In addition, after the ignition switch 1 is turned on (closed) in step S51, the switch control unit 13 performs the determination process described in step S42, and then connects the first capacitor 7 and the second capacitor 8 in series. It is good also as a connection. This step S52 corresponds to the switch control flow period T12 shown in FIG.

(Step S53)
The vehicle electronic control brake power supply system 100 supplies a series voltage of the first capacitor 7 and the second capacitor 8 to the electronic control brake 5. Since the series voltage of the first capacitor 7 and the second capacitor 8 is approximately 12 V, it can be the operating voltage of the electronic control brake 5.

  Therefore, in the vehicle electronic control brake power supply system 100, immediately after the ignition switch 1 is turned on in step S51, the output voltage supplied from the alternator 2 or the main storage battery 3 to the battery line 4 is temporarily lower than 12V. Even if the situation arises, the operating voltage of the electronic control brake 5 can be continuously supplied.

(Step S54)
The voltage comparison unit 14 of the switch control unit 13 includes an output voltage detected by the alternator generation voltage detection unit 15 and an operation voltage necessary for the operation of the electronic control brake 5 recorded in advance in the electronic control brake operation voltage storage unit 20. Compare As a result of the comparison by the voltage comparison unit 14, the output voltage detected by the alternator generation voltage detection unit 15 is based on the operation voltage necessary for the operation of the electronic control brake 5 recorded in advance in the electronic control brake operation voltage storage unit 20. If larger, the process proceeds to step S55.

  Further, as a result of the comparison by the voltage comparison unit 14 of the switch control unit 13, the output voltage detected by the alternator generation voltage detection unit 15 is the operation of the electronic control brake 5 recorded in advance in the electronic control brake operation voltage storage unit 20. If it is not greater than the required operating voltage, the process returns to step S52.

  By this step S54, the operation of step S52 is continued until the alternator 2 generates a voltage necessary for operating the electronic control brake 5 after the ignition switch 1 is turned on (closed). Then, when the alternator 2 generates a voltage necessary for operating the electronic control brake 5 after the ignition switch 1 is turned on (closed), the process proceeds to step S55.

(Step S55)
The switch control unit 13 does not connect the changeover switch 10 to the terminal A or the terminal B, and disconnects the first capacitor 7 and the second capacitor 8. Since the switch controller 13 disconnects the first capacitor 7 and the second capacitor 8, the second capacitor 8 is disconnected from the battery line 4, so that it is not charged.

  Further, since the switch controller 13 disconnects the first capacitor 7 and the second capacitor 8, the second capacitor 8 is disconnected from the first capacitor 7. No charge of 7 will be received. At this time, the switch controller 13 turns on the ground switch 11 (closes) and turns off the main storage battery charging switch 12 (opens).

(Step S56)
The first capacitor 7 is charged to approximately 12 V by the output voltage of the alternator 2 or the main storage battery 3 via the battery line 4. As illustrated in FIG. 1, the first capacitor 7 can supply an operating voltage to the electronic control brake 5 as long as the ignition switch 1 is turned on (closed). For this reason, the voltage of approximately 12 V charged in the first capacitor 7 becomes the backup power supply voltage of the electronic control brake 5. In addition, when the first capacitor 7 is in a half-charged state, the vehicle electronically controlled brake power supply system 100 can instantaneously charge up to 12V full charge.

  This step S56 corresponds to the period T13 of the switch control flow shown in FIG.

(Step S57)
The vehicle electronic control brake power supply system 100 determines whether or not the alternator 2 or the main storage battery 3 has a failure. The determination operation processing for determining whether or not there is a failure in step S57 overlaps with the operation processing content already described in step S45, and therefore description thereof is omitted here.

  If there is no failure in the alternator 2 or the main storage battery 3, the process proceeds to step S58. If there is a failure in the alternator 2 or the main storage battery 3, the process proceeds to step S5b.

(Step S58)
The switch control unit 13 determines whether or not the ignition switch 1 is turned off (opened). If the ignition switch 1 is turned off (opened), the process proceeds to step S59. If the ignition switch 1 is not turned off (opened), the process returns to step S57.

(Step S59)
The voltage adding unit 17 adds the detection voltage of the first capacitor charging voltage detection unit 18 and the detection voltage of the second capacitor charging voltage detection unit 19 to obtain the series voltage of the first capacitor 7 and the second capacitor 8. calculate. Moreover, the voltage comparison unit 14 compares the series voltage of the first capacitor 7 and the second capacitor 8 calculated by the voltage addition unit 17 with the detection voltage of the main storage battery voltage detection unit 16.

  If the output voltage (typically 12V) of the main storage battery 3 is equal to or higher than the series voltage of the first capacitor 7 and the second capacitor 8 according to the comparison result in the voltage comparison unit 14, the process proceeds to step S5a. Moreover, if the voltage of the main storage battery 3 is not equal to or higher than the series voltage of the first capacitor 7 and the second capacitor 8 according to the comparison result in the voltage comparison unit 14, the process proceeds to step S5c.

  If the ignition switch 1 is turned off (opened) in step S58 without performing the determination step in step S59, the process may automatically proceed to step S5c.

(Step S5a)
The switch control unit 13 connects the first capacitor 7 and the second capacitor 8 in parallel. If the switch control unit 13 connects the first capacitor 7 and the second capacitor 8 in parallel, the second capacitor 8 is caused by a part of the charge equivalent to about 12V charged in the first capacitor 7. Is charged. The charging voltages of the first capacitor 7 and the second capacitor 8 are both equal to approximately 6V. Thereby, since both the first capacitor 7 and the second capacitor 8 are in a substantially half-charged state, it is possible to prevent the occurrence of deterioration in the fully charged state.

  Specifically, the switch control unit 13 connects the changeover switch 10 to the terminal A. At this time, the switch control unit 13 turns on (closes) the ground switch 11 and turns off (opens) the main storage battery charging switch 12. This step S5a corresponds to the period T15 of the switch control flow shown in FIG.

(Step S5b)
The backup power supply 6 supplies the electronic control brake 5 with a voltage of approximately 12 V fully charged in the first capacitor 7. As a result, the vehicle electronically controlled brake power supply system 100 can stably supply the operating voltage necessary for the operation of the electronically controlled brake 5 even when the alternator 2 or the main storage battery 3 fails.

(Step S5c)
The switch control unit 13 connects the first capacitor 7 and the second capacitor 8 in series. Specifically, the switch control unit 13 connects the changeover switch 10 to the terminal B side. At this time, the switch control unit 13 turns off the ground switch 11 (opens) and turns on (closes) the main storage battery charging switch 12. When the switch control unit 13 turns on (closes) the main storage battery charging switch 12, a bypass path is formed from the first capacitor 7 and the second capacitor 8 connected in series to the main storage battery 3. .

  Further, the switch controller 13 may automatically and quickly connect the first capacitor 7 and the second capacitor 8 in series if the ignition switch 1 is turned off (opened) in step S58.

  Further, after the ignition switch 1 is turned off (opened) in step S58, the switch control unit 13 performs the determination process as described in step S59, and then connects the first capacitor 7 and the second capacitor 8 in series. It is good also as a connection.

  The series voltage of the first capacitor 7 and the second capacitor 8 connected in series by the switch control unit 13 is supplied to the main storage battery 3 via the main storage battery charging switch 12. Thereby, a part of the electric energy stored in the first capacitor 7 and the second capacitor 8 is recovered in the main storage battery 3.

  For example, if the voltage of the first capacitor 7 is 12V full charge and the charge voltage of the second capacitor 8 is 6V half charge, the series voltage 18V is supplied to the main storage battery 3. Then, the electric energy is recovered until the voltage of the first capacitor 7 is 9V, the voltage of the second capacitor 8 is 3V, and the series voltage is about 12V which is the same as that of the main storage battery 3. Thus, the energy-saving electronically controlled brake power supply system 100 for a vehicle can be obtained without wastefully discarding the electric energy stored in the first capacitor 7 and the second capacitor 8.

  Further, when the collection of the electric energy is completed, the voltage of the first capacitor 7 and the second capacitor 8 becomes 6V of half charge by the operation process described in step 5a. And deterioration of the second capacitor 8 can be suppressed. This step S5c corresponds to the period T14 of the switch control flow shown in FIG.

  Next, a second embodiment of a vehicle electronically controlled brake power supply system 600 that includes a constant voltage supply unit of 6.5 V and uses a voltage of the constant voltage supply unit to substantially charge a capacitor halfway will be described.

(Second embodiment)
FIG. 6 is a conceptual block diagram of a configuration of a vehicle electronic control brake power supply system 600 according to the second embodiment. The vehicle electronic control brake power supply system 600 exemplified in the second embodiment includes a voltage detection unit 602 that detects the voltage of the battery line 4. The backup power supply 606 of the vehicle electronic control brake power supply system 600 can switch the first capacitor 607 and the second capacitor 608 between serial connection, parallel connection, and non-connection by switch control of the switching unit 609. is there.

  In addition, the backup power source 606 is a constant voltage at which the voltage (typically 12V) of the battery line 4 is 6.5V, and the first capacitor 607 and the second capacitor 608 are substantially half charged at a voltage of 6.5V. A voltage supply unit 630 is provided.

  In addition, the switching unit 609 includes a changeover switch 610 that switches the first capacitor 607 and the second capacitor 608 between series connection, parallel connection, and non-connection. The changeover switch 610 includes a terminal B that connects the first capacitor 607 and the second capacitor 608 in series, and a terminal A that connects the first capacitor 607 and the second capacitor 608 in parallel. .

  In addition, the switching unit 609 includes a switch control unit 613. When the switch control unit 613 connects the first capacitor 607 and the second capacitor 608 in parallel, the first capacitor 607 and the second capacitor 608 are each set to a voltage of 6.5 V from the constant voltage supply unit 630. When supplied, it is almost half charged.

  The ground switch 611 is a switch for grounding the terminal B in which the first capacitor 607 and the second capacitor 608 are connected in series. The switch control unit 613 includes an electronic control brake operation voltage storage unit 620 that stores in advance an operation voltage necessary for the operation of the electronic control brake 5. The switch control unit 613 includes a voltage comparison unit 614 that compares the voltage detected by the voltage detection unit 602 with the voltage stored in the electronic control brake operation voltage storage unit 620. The switch control unit 613 controls the switch operation of the changeover switch 610 and the ground switch 611 based on the comparison result in the voltage comparison unit 614 and the like.

  Moreover, since the description already repeated in the first embodiment is repeated, the same reference numerals as those in FIG. 1 are given, and the description is omitted here.

  Next, a switch operation sequence of the vehicle electronically controlled brake power supply system 600 will be described with reference to FIG. FIG. 7 is a diagram illustrating an operation sequence of the changeover switch 610 and the ground switch 611 of the vehicle electronic control brake power supply system 600 according to the second embodiment.

  FIG. 7A shows an example in which the backup power supply 606 half-charges each of the first capacitor 607 and the second capacitor 608 to 6.5 V when the ignition switch 1 is turned on (closed). It is shown.

  In the period T16 shown in FIG. 7A, when the ignition switch 1 (IG) is turned on (closed), the switch control unit 613 turns on the changeover switch 610 (SW1) (closed on the terminal A side). Then, the ground switch 611 (SW2) is turned on (closed). Thus, the first capacitor 607 and the second capacitor 608 are connected in parallel, and the first capacitor 607 and the second capacitor 608 are respectively connected by the voltage of approximately 6.5 V from the constant voltage supply unit 630. Half-charged to 6.5V. That is, it is assumed that the constant voltage supply unit 630 supplies a voltage that provides approximately half charging of the first capacitor 607 and the second capacitor 608.

  It should be noted that the vehicle electronic control brake power supply system 600 has a first capacitor 607 and a second capacitor 608 connected in series, as will be described later, if a failure occurs in the alternator 2 and the main storage battery 3. Connect. Then, the backup power source 606 supplies a series voltage (typically about 13 V) of the first capacitor 607 and the second capacitor 608 to the electronic control brake 5. The electronic control brake 5 can operate satisfactorily even at the time of failure by the series voltage supplied from the first capacitor 607 and the second capacitor 608.

  Next, in the period T17 shown in FIG. 7A, when the ignition switch 1 (IG) is turned off (open), the switch control unit 613 turns the changeover switch 610 (SW1) off (open), The ground switch 611 (SW2) is turned on (closed). As a result, the first capacitor 607 and the second capacitor 608 are separated from each other and held independently while being substantially half-charged to 6.5V.

  For this reason, the vehicle electronically controlled brake power supply system 600 can suppress deterioration of the first capacitor 607 and the second capacitor 608 that are known to occur easily at full charge (approximately 12 V).

  FIG. 7B is a diagram showing a typical example in which the vehicle electronic control brake power supply system 600 supplies a backup voltage to the electronic control brake 5 immediately after the ignition switch 1 is turned on (closed).

  7B, when the ignition switch 1 (IG) is turned on (closed), the switch control unit 613 turns on the changeover switch 610 (SW1) (closes to the terminal B side). ) And the ground switch 611 (SW2) is turned off (open). Thereby, the first capacitor 607 and the second capacitor 608 are connected in series.

  Then, the backup power source 606 supplies a series voltage (typically about 13 V) of the first capacitor 607 and the second capacitor 608 to the electronic control brake 5. Immediately after the ignition switch 1 is turned on (closed), a plurality of electronic devices of the vehicle are activated at the same time, so the voltage of the main storage battery 3 may be instantaneously reduced. Further, immediately after the ignition switch 1 is turned on (closed), the alternator 2 is not yet functioning sufficiently, and there is a concern that a voltage sufficient to operate the electronic control brake 5 is not generated. .

  On the other hand, it may be assumed that the vehicle starts traveling immediately after the ignition switch 1 is turned on (closed). For this reason, it is preferable to quickly supply the electronic control brake 5 with an operating voltage that allows the electronic control brake 5 to operate even immediately after the ignition switch 1 is turned on (closed).

  The vehicle electronic control brake power supply system 600 supplies a series voltage of the first capacitor 607 and the second capacitor 608 to the electronic control brake 5 in a transition period immediately after the ignition switch 1 is turned on (closed). It is possible to ensure a reliable brake operation.

  Next, in the period T19 shown in FIG. 7B, when the ignition switch 1 (IG) is turned on (closed), the switch control unit 613 turns on the changeover switch 610 (SW1) (terminal A side). And the ground switch 611 (SW2) is turned on (closed). As a result, the first capacitor 607 and the second capacitor 608 are connected in parallel. In addition, the first capacitor 607 and the second capacitor 608 are substantially half-charged to 6.5 V by the voltage of approximately 6.5 V from the constant voltage supply unit 630.

  Next, in the period T20 shown in FIG. 7B, when the ignition switch 1 (IG) is turned off (opened), the switch control unit 613 turns the changeover switch 610 (SW1) off (opened), The ground switch 611 (SW2) is turned on (closed). As a result, the first capacitor 607 and the second capacitor 608 are separated from each other and held separately in a state of being substantially half-charged to 6.5V. For this reason, the vehicle electronically controlled brake power supply system 600 can suppress deterioration of the first capacitor 607 and the second capacitor 608 that are known to occur easily at full charge (approximately 12 V).

  FIG. 7C is a diagram illustrating a switch operation sequence when a failure occurs in the vehicle electronic control brake power supply system 600. Here, the failure typically means a situation where the alternator 2 or the main storage battery 3 cannot supply the battery line 4 with an output voltage necessary for the operation of the electronic control brake 5.

  In a period T21 shown in FIG. 7C, when the ignition switch 1 (IG) is turned on (closed), the switch control unit 613 turns on the changeover switch 610 (SW1) (closes to the terminal A side). And the ground switch 611 (SW2) is turned on (closed). Since the operation here is the same as the operation in the period T16 already described, the description is omitted here.

  Further, it is assumed that a failure has occurred in the alternator 2 and the main storage battery 3 in the period T21 shown in FIG. When a failure occurs in the alternator 2 and the main storage battery 3, the output voltage to the battery line 4 detected by the voltage detector 602 decreases. Typically, the voltage comparison unit 614 detects that the voltage detected by the voltage detection unit 602 is lower than the operation voltage necessary for the operation of the electronic control brake 5 recorded in advance in the electronic control brake operation voltage storage unit 620. The trigger is output to the switch control unit 613. In such a case, since the voltage for operating the electronic control brake 5 is insufficient, a reliable operation of the electronic control brake 5 cannot be expected.

  Therefore, the switch control unit 613 executes a switch operation process shown in the period T22. In the period T22 shown in FIG. 7C, when the ignition switch 1 (IG) is turned on (closed), the switch control unit 613 turns on the changeover switch 610 (SW1) (closes to the terminal B side). And the ground switch 611 (SW2) is turned off (opened). Thereby, the first capacitor 607 and the second capacitor 608 are connected in series.

  Then, the backup power source 606 supplies a series voltage (typically about 13 V) of the first capacitor 607 and the second capacitor 608 to the electronic control brake 5. Therefore, the electronic control brake 5 can operate satisfactorily even at the time of failure by the series voltage supplied from the first capacitor 607 and the second capacitor 608.

  Next, the operation of the vehicle electronic control brake power supply system 600 will be described in detail with reference to FIG. FIG. 8 is a schematic diagram showing an operation flow of the electronically controlled brake power supply system 600 for a vehicle. Hereinafter, description will be made sequentially according to the steps shown in FIG. The operation flow described below corresponds to the control flow of the switches shown in FIGS. 7B and 7C.

(Step S81)
The vehicle electronic control brake power supply system 600 determines whether or not the ignition switch 1 is turned on. The ignition switch 1 is a switch that activates an electronic device of the entire vehicle and activates an engine. If the ignition switch 1 is turned on, the process proceeds to step S82. If the ignition switch 1 is not turned on, the process waits in step S81.

(Step S82)
The vehicle electronic control brake power supply system 600 determines whether or not the voltage of the battery line 4 detected by the voltage detection unit 602 is 13 V or higher. If the voltage of the battery line 4 detected by the voltage detector 602 is 13 V or higher, the process proceeds to step S83. If the voltage of the battery line 4 detected by the voltage detector 602 is not 13 V or higher, the process proceeds to step S86.

  Here, in the vehicle electronically controlled brake power supply system 600, when the alternator 2 is sufficiently generating power, the alternator 2 generates a voltage of about 13V. For this reason, when the alternator 2 is sufficiently generating power, a voltage of about 13 V is output to the battery line 4. Therefore, if a voltage of about 13 V is not output to the battery line 4, the vehicle electronically controlled brake power supply system 600 has failed in the alternator 2 or the alternator 2 is in the initial stage of activation and still generates sufficient power. Judge that there is no state.

  Specifically, the voltage comparison unit 614 compares the voltage detected by the voltage detection unit 602 with a predetermined voltage 13V. As a result of the comparison by the voltage comparison unit 614, if the voltage detected by the voltage detection unit 602 is equal to or higher than a predetermined voltage of 13V, the process proceeds to step S83. Further, as a result of the comparison by the voltage comparison unit 614, if the voltage detected by the voltage detection unit 602 is not equal to or higher than the predetermined voltage of 13V, the process proceeds to step S86.

  Note that the predetermined voltage (13V) may be an operation voltage (12V) necessary for the operation of the electronic control brake 5 stored in advance in the electronic control brake operation voltage storage unit 620, for example. In addition, the vehicle electronic control brake power supply system 600 may further include a storage unit that stores a predetermined voltage (13 V) serving as an index for determining whether or not the alternator 2 is generating power normally.

(Step S83)
The switch control unit 613 connects the first capacitor 607 and the second capacitor 608 in parallel. Specifically, the switch control unit 613 turns on (closes) the changeover switch 610 on the terminal A side and turns on (closes) the ground switch 611. This step S83 corresponds to the switch control flow period T19 shown in FIG. This step S83 corresponds to a period T21 of the switch control flow shown in FIG.

(Step S84)
The vehicular electronically controlled brake power supply system 600 includes a first capacitor 607 and a second capacitor 608 connected in parallel by a constant voltage supply unit 630 that sets the output voltage of the alternator 2 or the main storage battery 3 to 6.5V. Charge to 6.5V.

(Step S85)
The vehicle electronic control brake power supply system 600 determines whether or not there is a failure. If there is a failure, the process proceeds to step S86. If there is no failure, the process returns to step S83.

  Specifically, the voltage comparison unit 614 compares the voltage detected by the voltage detection unit 602 with the operation voltage necessary for the operation of the electronic control brake 5 stored in advance in the electronic control brake operation voltage storage unit 620. .

  If the voltage detected by the voltage detection unit 602 is greater than the operation voltage required for the operation of the electronic control brake 5 stored in advance in the electronic control brake operation voltage storage unit 620 as a result of the comparison by the voltage comparison unit 614, step S83. Return to. In addition, as a result of comparison by the voltage comparison unit 614, if the voltage detected by the voltage detection unit 602 is not greater than the operation voltage required for the operation of the electronic control brake 5 stored in advance in the electronic control brake operation voltage storage unit 620. Proceed to step S86.

(Step S86)
The switch control unit 613 connects the first capacitor 607 and the second capacitor 608 in series. Specifically, the switch control unit 613 connects the changeover switch 610 to the terminal B side. At this time, the switch control unit 613 turns off (opens) the ground switch 611.

  This step S86 corresponds to the period T22 of the switch control flow shown in FIG. Further, when the process has come from step S82 to step S86, this step S86 corresponds to the switch control flow period T18 shown in FIG. 7B.

(Step S87)
The vehicle electronically controlled brake power supply system 600 supplies a series voltage of the first capacitor 607 and the second capacitor 608 to the electronically controlled brake 5. Since the series voltage of the first capacitor 607 and the second capacitor 608 is approximately 13 V, it can be the operating voltage of the electronic control brake 5. Accordingly, the vehicle electronic control brake power supply system 600 can continuously supply the operating voltage of the electronic control brake 5 even in the event of a failure.

(Step S88)
The vehicle electronic control brake power supply system 600 determines whether or not the ignition switch 1 is turned off (opened). When the ignition switch 1 is turned off (opened), the operation flow ends. If the ignition switch 1 is not turned off (opened), the process returns to step S82.

  Further, when the ignition switch 1 is turned off (opened), the switch control unit 613 may perform switch control as shown in a switch control flow period T20 shown in FIG. 7B. That is, the vehicle electronically controlled brake power supply system 600 may hold the charging voltage of 6.5 V for the first capacitor 607 and the second capacitor 608 individually and independently.

  Further, the vehicle electronic control brake power supply system 600 may hold a charging voltage of 6.5 V while the first capacitor 607 and the second capacitor 608 are connected in parallel. In addition, in both cases where the first capacitor 607 and the second capacitor 608 are held individually or in parallel connection, the first capacitor 607 The voltage with the second capacitor 608 decreases.

  As described above, since the electronically controlled brake power supply system 600 for a vehicle places the first capacitor 607 and the second capacitor 608 in a substantially half-charged state (typically 6.5V), there is a concern during full charge. It is possible to suppress the occurrence of deterioration of the capacitor. In the event of a failure, the vehicle electronic control brake power supply system 600 supplies the operating voltage required for the electronic control brake 5 by connecting the first capacitor 607 and the second capacitor 608 in series. To do. Therefore, the vehicle electronic control brake power supply system 600 including the highly reliable and long-life backup power supply 606 can be obtained.

  It should be noted that the vehicle electronic control brake power supply system 100 and the vehicle electronic control brake power supply system 600 described above can be used by changing their configurations and operations within a self-evident range. In addition, the above-described vehicle electronic control brake power supply system 100 and the vehicle electronic control brake power supply system 600 do not preclude the provision of other devices or the like in addition to or in place of the components described above. .

  One or a plurality of capacitors and the like included in the first capacitors 7 and 607 and the second capacitors 8 and 608 each have a voltage of approximately 12 V when fully charged, and a voltage of approximately 6 V when half charged. It is particularly preferable from the viewpoint of preventing deterioration of each individual capacitor. The first capacitors 7 and 607 and the second capacitors 8 and 608 are appropriately inserted with a step of spontaneous discharge or forced discharge in the operation described above in order to discharge excessive accumulated charges. May be.

1 is a conceptual block diagram of a configuration of an electronically controlled brake power supply system for a vehicle according to a first embodiment. It is a figure which shows the operation | movement sequence of the switch of the electronically controlled brake power supply system for vehicles concerning 1st embodiment. It is a figure which shows the operation | movement sequence of the switch at the time of the electrical energy collection | recovery of the electronically controlled brake power supply system for vehicles concerning 1st embodiment. It is a schematic diagram which shows the operation | movement flow of the electronically controlled brake power supply system for vehicles. It is a schematic diagram which shows the electric energy collection | recovery operation | movement flow of the electronically controlled brake power supply system for vehicles. It is a composition conceptual block diagram of the electronically controlled brake power supply system for vehicles concerning a second embodiment. It is a figure which shows the operation | movement sequence with a changeover switch and ground switch concerning 2nd embodiment. It is a schematic diagram which shows the operation | movement flow of the electronically controlled brake power supply system for vehicles concerning 2nd embodiment.

Explanation of symbols

1 .... Ignition switch, 2 .... Alternator, 3 .... Main storage battery, 4 .... Battery line, 5 .... Electronic brake, 6 .... Backup power supply, 7 .... First capacitor, 8 .... Second capacitor Capacitor, 9 ·· Switching unit, 10 ·· Changeover switch, 11 ·· Ground switch, 12 ·· Main battery charge switch, 13 ·· Switch control unit, 14 ·· Voltage comparison unit, 15 ·· Alternator generation voltage detection unit 16 .. Main storage battery voltage detector 17.. Voltage adder 18. First capacitor charge voltage detector 19. Second capacitor charge voltage detector 20. 100 ... Vehicle electronic control brake power supply system.

Claims (14)

An alternator that generates a voltage from a power source of a vehicle, a main storage battery that is connected to be rechargeable by the alternator, an electronic control brake that is supplied with an operating voltage by the alternator or the main storage battery, and a rechargeable connection that is connected by the alternator An electronically controlled brake power supply system for a vehicle comprising a backup power supply for the electronically controlled brake,
The backup power supply is
A first capacitor charged by the alternator when an ignition switch of the vehicle is turned on;
A second capacitor connected in parallel with the first capacitor and receiving and charging a portion of the charge stored in the first capacitor when the ignition switch of the vehicle is turned off;
An electronically controlled brake power supply system for vehicles. The electronically controlled brake power supply system for vehicles according to claim 1,
An alternator generation voltage detector for detecting a voltage generated by the alternator;
The backup power source includes a switching unit capable of switching the first capacitor and the second capacitor to be connected in parallel or in series or disconnected.
The switching unit is
When the ignition switch of the vehicle is turned on,
The first capacitor and the second capacitor are connected in series so as to supply a series voltage of the first capacitor and the second capacitor to the electronic brake.
If the voltage generated by the alternator detected by the alternator generation voltage detector is greater than the operating voltage of the electronically controlled brake,
The first capacitor and the second capacitor are disconnected, the voltage generated by the alternator is supplied to the first capacitor to charge the first capacitor,
When the ignition switch of the vehicle is turned off,
A switching unit in which the first capacitor and the second capacitor are connected in parallel so that the second capacitor receives a part of the charge stored in the first capacitor and is charged; ,
An electronically controlled brake power supply system for vehicles. In the vehicle electronically controlled brake power supply system according to claim 2,
A main storage battery voltage detection unit for detecting a voltage of the main storage battery;
The switching unit is
When the ignition switch of the vehicle is turned on,
The first capacitor and the second capacitor are connected in series so as to supply a series voltage of the first capacitor and the second capacitor to the electronic brake.
If any of the voltage of the main storage battery detected by the main storage battery voltage detection unit and the voltage generated by the alternator detected by the alternator generation voltage detection unit is greater than the operating voltage of the electronic control brake,
A switching unit that disconnects the first capacitor and the second capacitor and supplies the voltage generated by the alternator or the voltage of the main storage battery to the first capacitor to charge the first capacitor. An electronically controlled brake power supply system for vehicles. In the vehicle electronically controlled brake power supply system according to any one of claims 1 to 3,
A main storage battery voltage detection unit for detecting the voltage of the main storage battery;
The backup power supply includes a first capacitor charge voltage detector that detects a charge voltage of the first capacitor;
A second capacitor charging voltage detector for detecting a charging voltage of the second capacitor;
The main storage battery is charged by a changeover switch capable of switching the first capacitor and the second capacitor in parallel connection, series connection or non-connection, and a series voltage of the first capacitor and the second capacitor. A switching unit having a main storage battery charge switch connectable to,
The switching unit is
When the ignition switch of the vehicle is turned off,
An addition voltage of the charging voltage of the first capacitor detected by the first capacitor charging voltage detector and the charging voltage of the second capacitor detected by the second capacitor charging voltage detector is the main storage battery. If it is larger than the voltage of the main storage battery detected by the voltage detector,
Short-circuiting the main storage battery charging switch so as to charge the main storage battery by a series voltage due to a series connection of the first capacitor and the second capacitor;
An addition voltage of the charging voltage of the first capacitor detected by the first capacitor charging voltage detector and the charging voltage of the second capacitor detected by the second capacitor charging voltage detector is the main storage battery. If it is not larger than the voltage of the main battery detected by the voltage detector,
The first capacitor and the second capacitor are opened so that the main capacitor charging switch is opened and the second capacitor receives and charges a part of the charge stored in the first capacitor. Is a switching unit that is connected in parallel,
An electronically controlled brake power supply system for vehicles. An alternator that generates a predetermined voltage, a main storage battery that is connected to be rechargeable by the alternator, an electronically controlled brake that is supplied with an operating voltage by the alternator or the main storage battery, and can be charged by the alternator or the main storage battery. In the vehicle electronic control brake power supply system, comprising: a connected backup power supply of the electronic control brake;
The backup power supply includes a first capacitor and a second capacitor connected to be switchable between a parallel connection and a series connection,
If both the alternator and the main storage battery fail, the first capacitor and the second capacitor are supplied so that a series voltage of the first capacitor and the second capacitor is supplied to the electronic brake. A switching unit having a capacitor connected in series,
An electronically controlled brake power supply system for vehicles. In the vehicle electronically controlled brake power supply system according to claim 5,
The electronically controlled brake power supply system is
A voltage detector that detects a voltage between the alternator and the main storage battery; and the alternator or the second capacitor so that the first capacitor and the second capacitor connected in parallel are each charged to about half of a full charge capacity. A constant voltage supply unit for converting the voltage of the main storage battery,
The switching unit is
When the ignition switch of the vehicle is turned on,
When it is determined by the voltage detected by the voltage detection unit that either the alternator or the main storage battery is not in failure, the first capacitor and the second capacitor are connected from the constant voltage supply unit. The first capacitor and the second capacitor are connected in parallel so as to charge up to about half of the full charge capacity,
When it is determined that both the alternator and the main storage battery are in failure based on the voltage detected by the voltage detection unit, the series voltage of the first capacitor and the second capacitor is applied to the electronically controlled brake. In order to supply, is a switching unit in which the first capacitor and the second capacitor are connected in series,
An electronically controlled brake power supply system for vehicles. In the vehicle electronically controlled brake power supply system according to any one of claims 1 to 6,
The vehicular electronically controlled brake power supply system, wherein the capacitance of the first capacitor and the capacitance of the second capacitor are the same. An alternator that generates a voltage from a power source of a vehicle, a main storage battery that is connected to be rechargeable by the alternator, an electronic control brake that is supplied with an operating voltage by the alternator or the main storage battery, and a rechargeable connection that is connected by the alternator A backup power supply / discharge method of a vehicle electronic control brake power supply system comprising:
The backup power supply is charged by receiving a first capacitor charged by the alternator and a part of the electric charge stored in the first capacitor connected in parallel with the first capacitor. And a capacitor,
Charging the first capacitor with the alternator when a vehicle ignition switch is turned on; and
When the ignition switch of the vehicle is turned off, the first capacitor and the second capacitor are so charged that the second capacitor receives and charges a part of the electric charge stored in the first capacitor. A step of connecting the capacitors in parallel with each other;
A backup power supply charging / discharging method for an electronically controlled brake power supply system for vehicles. The backup power supply charging / discharging method of the electronically controlled brake power supply system for vehicles according to claim 8,
The vehicle electronic control brake power supply system includes an alternator generation voltage detection unit that detects a voltage generated by the alternator,
The backup power source includes a switching unit capable of switching the first capacitor and the second capacitor to be connected in parallel or in series or disconnected.
When the ignition switch of the vehicle is turned on,
A first voltage comparison step for comparing the voltage generated by the alternator detected by the alternator generation voltage detector and the operating voltage of the electronically controlled brake;
In the first voltage comparison step, when the voltage generated by the alternator detected by the alternator generation voltage detector is smaller than the operating voltage of the electronically controlled brake,
Connecting the first capacitor and the second capacitor in series so that the switching unit supplies a series voltage of the first capacitor and the second capacitor to the electronic control brake; ,
In the first voltage comparison step, when the voltage generated by the alternator detected by the alternator generation voltage detector is larger than the operating voltage of the electronically controlled brake,
The switching unit disconnects the first capacitor and the second capacitor, and supplies the voltage generated by the alternator to the first capacitor to charge the first capacitor;
When the ignition switch of the vehicle is turned off,
The switching unit is configured to connect the first capacitor and the second capacitor in parallel so that the second capacitor receives and charges a part of the electric charge accumulated in the first capacitor. And a process of
A backup power supply charging / discharging method for an electronically controlled brake power supply system for vehicles. In the backup power supply charging / discharging method of the electronically controlled brake power supply system for vehicles according to claim 9,
The vehicle electronically controlled brake power supply system further includes a main storage battery voltage detection unit that detects a voltage of the main storage battery,
When the ignition switch of the vehicle is turned on,
The voltage generated by the alternator detected by the alternator generation voltage detector and the operating voltage of the electronic control brake are compared, the voltage of the main storage battery detected by the main storage battery voltage detector, and the electronic control A second voltage comparison step for comparing the operating voltage of the brake;
In the second voltage comparison step, the voltage of the main storage battery detected by the main storage battery voltage detection unit and the voltage generated by the alternator detected by the alternator generation voltage detection unit are both operating voltages of the electronic control brake. Smaller than
The switching unit connecting the first capacitor and the second capacitor in series so as to supply a series voltage of the first capacitor and the second capacitor to the electronic control brake; ,
In the second voltage comparison step, one of the voltage of the main storage battery detected by the main storage battery voltage detection unit and the voltage generated by the alternator detected by the alternator generation voltage detection unit is the electronic control brake. If the operating voltage is greater than
The switching unit is configured to supply the voltage generated by the alternator to the first capacitor or the voltage of the main storage battery to charge the first capacitor, and the switching unit includes the first capacitor and the second capacitor. A step of disconnecting
A backup power supply charging / discharging method for an electronically controlled brake power supply system for vehicles. The backup power supply charging / discharging method of the vehicle electronically controlled brake power supply system according to any one of claims 8 to 10,
The vehicle electronically controlled brake power supply system includes a main storage battery voltage detection unit that detects a voltage of the main storage battery,
The backup power supply includes a first capacitor charge voltage detector that detects a charge voltage of the first capacitor;
A second capacitor charging voltage detector for detecting a charging voltage of the second capacitor; a changeover switch capable of switching the first capacitor and the second capacitor in parallel connection, series connection or non-connection;
A switching unit having a main storage battery charge switch connectable to charge the main storage battery with a series voltage of the first capacitor and the second capacitor;
When the ignition switch of the vehicle is turned off,
An addition voltage of the charging voltage of the first capacitor detected by the first capacitor charging voltage detector and the charging voltage of the second capacitor detected by the second capacitor charging voltage detector, and the main storage battery A third voltage comparison step for comparing the voltage of the main storage battery detected by the voltage detector;
In the third voltage comparison step, the charging voltage of the first capacitor detected by the first capacitor charging voltage detector and the charging voltage of the second capacitor detected by the second capacitor charging voltage detector Is larger than the voltage of the main storage battery detected by the main storage battery voltage detection unit,
The switching unit connects the first capacitor and the second capacitor in series, and charges the main storage battery with a series voltage of the first capacitor and the second capacitor. A step of short-circuiting the storage battery charging switch;
In the third voltage comparison step, the charging voltage of the first capacitor detected by the first capacitor charging voltage detector and the charging voltage of the second capacitor detected by the second capacitor charging voltage detector Is not larger than the voltage of the main storage battery detected by the main storage battery voltage detection unit,
The switching unit is configured to connect the first capacitor and the second capacitor in parallel so that the second capacitor receives and charges a part of the charge accumulated in the first capacitor. And opening the main storage battery charge switch;
A backup power supply charging / discharging method for an electronically controlled brake power supply system for vehicles. An alternator that generates a voltage from a power source of a vehicle, a main storage battery that is connected to be rechargeable by the alternator, an electronic control brake that is supplied with an operating voltage by the alternator or the main storage battery, and the alternator or the main storage battery. A backup power supply / discharge method for an electronically controlled brake power supply system for a vehicle, comprising:
A backup power source of the electronically controlled brake includes a first capacitor and a second capacitor connected in a switchable manner between a parallel connection and a series connection, and the first capacitor and the second capacitor connected in parallel or in series. A switching unit that can be switched and connected to the connection,
When the vehicle's ignition switch is turned on,
If either of the alternator and the main storage battery does not fail, the switching unit includes the first capacitor so that the alternator or the main storage battery is charged to about half of a full charge capacity. And connecting the second capacitor in parallel;
If both the alternator and the main storage battery fail, the switching unit supplies the series voltage of the first capacitor and the second capacitor to the electronically controlled brake. Connecting a capacitor and the second capacitor in series;
A backup power supply charging / discharging method for an electronically controlled brake power supply system for vehicles. The backup power supply charging / discharging method of the vehicle electronic control brake power supply system according to claim 12,
The electronically controlled brake power supply system is
A voltage detection unit for detecting a voltage between the alternator and the main storage battery, and a voltage of the alternator or the main storage battery to each of the first capacitor and the second capacitor connected in parallel to each other about half of a full charge capacity A constant voltage supply unit that converts the voltage so as to charge up to
When the ignition switch of the vehicle is turned on,
A failure determination step of determining whether or not both the alternator and the main storage battery are in failure by the voltage detected by the voltage detection unit;
When it is determined by the failure determination step that either the alternator or the main storage battery is not in failure, the first capacitor and the second capacitor are respectively filled from the constant voltage supply unit. The switching unit is configured to connect the first capacitor and the second capacitor in parallel so as to charge up to about half of the charge capacity;
When the failure determination step determines that both the alternator and the main storage battery have failed, the series voltage of the first capacitor and the second capacitor is supplied to the electronically controlled brake. As described above, the switching unit includes connecting the first capacitor and the second capacitor in series.
A backup power supply charging / discharging method for an electronically controlled brake power supply system for vehicles. The backup power supply charging / discharging method of the vehicle electronic control brake power supply system according to any one of claims 8 to 13,
The electrostatic capacity of said 1st capacitor and the electrostatic capacity of said 2nd capacitor are the same. The backup power supply charging / discharging method of the electronically controlled brake power supply system for vehicles characterized by the above-mentioned.

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