JP6214430B2 - Control device for idle stop car - Google Patents

Description

  The present invention automatically stops the engine when a predetermined engine stop condition is satisfied, and supplies necessary power to the start means by the power storage means when the predetermined restart condition is satisfied when the engine is automatically stopped. The present invention relates to a control device for an idle stop vehicle that restarts an engine.

  Conventionally, a so-called idling stop vehicle starts an engine by an IG (ignition) on operation, and thereafter executes idling stop control until the engine stops by an IG off operation, and a predetermined automatic stop condition is satisfied. The engine is automatically stopped and the engine is automatically restarted when a predetermined restart condition is satisfied.

  In vehicles equipped with this kind of idling stop control function, the starter is usually driven by the discharge power of the in-vehicle battery, the engine is restarted, the alternator is driven by the driving force of the engine to generate electricity, and the in-vehicle battery is charged. (For example, Patent Document 1).

JP 2010-53794 A (see paragraphs 0019-0023)

  However, when restarting the engine with a starter, since it is not quiet and takes a long time to start, in recent years, the starter is used only at the time of the first engine start. It has been proposed to extend the life of the battery by using an alternator that has excellent start-up time and low current consumption.

  However, when the engine is restarted at idle stop, the engine restart may fail. If the cause is an abnormality of the alternator, the engine cannot be restarted by the alternator. Therefore, it is desired to take appropriate measures while suppressing battery consumption as much as possible.

  In an idle stop vehicle in which engine restart at idle stop is performed only by an alternator, the present invention can accurately restart the engine according to the amount of power stored in the power storage means even when engine restart fails. The purpose is to do.

  In order to achieve the above-described object, the control device for an idle stop vehicle of the present invention automatically stops the engine when a predetermined engine stop condition is satisfied, and the predetermined restart condition is satisfied when the engine is automatically stopped. In the idling stop vehicle control device for supplying necessary power to the starting means by the power storage means and restarting the engine, an alternator for generating electric power by the driving force of the engine and charging the generated power to the power storage means, Detection means for detecting the amount of electricity stored in the electricity storage means; and control means for performing engine restart control by the alternator instead of the start means by supplying power to the alternator by the electricity storage means when the restart condition is satisfied. The control means detects the detection when the engine restart control based on establishment of the restart condition fails. If the charged amount detected by the means is greater than or equal to a predetermined value, an attempt is made to restart the engine by the starting means, and if the charged amount is lower than the predetermined value, the engine is restarted by the alternator. It is characterized by trying to start (Claim 1).

  According to the first aspect of the present invention, when the engine is restarted by the alternator when the restart condition is satisfied, when the engine restart control is unsuccessful, the power storage amount of the power storage unit detected by the detection unit is determined in advance. If it is equal to or greater than the predetermined value, engine restart by the starting means is attempted, and if the stored amount is lower than a predetermined value, engine restart by the alternator is attempted.

  Therefore, even if the engine restart control fails when the restart condition is satisfied, the engine restart control by the starting means is performed on the condition that the amount of power stored in the power storage means is equal to or greater than a predetermined value. After the restart control fails, the engine can be reliably restarted by the starting means.

  On the other hand, if the amount of electricity stored in the electricity storage means is lower than a predetermined value, engine restart by the alternator is attempted, and if the engine can be restarted by the retry, engine restart by the alternator with excellent quietness and short start time As a result of shortening the starting time, battery consumption can be suppressed.

It is a block diagram of one embodiment of a control device of an idle stop car of the present invention. 2 is a timing chart for explaining the operation of FIG. 1.

  Next, in order to describe the present invention in more detail, an embodiment of the present invention will be described in detail with reference to FIG. 1 and FIG.

  FIG. 1 shows a block configuration of a vehicle control device provided in an idle stop vehicle 1. The idle stop vehicle 1 is a single lead battery having a relatively small capacity of 12V as a power source in order to reduce weight, size, and the like. 2 is provided. This battery 2 is the power storage means of the present invention, and the negative terminal is connected to the casing of the idle stop vehicle 1.

  In FIG. 1, 3 is an engine of the idle stop vehicle 1, 4 is a CVT (Continuously Variable Transmission) on the transmission side of the engine 3, and 5 is a starter that starts the engine 3. Power is supplied from the battery 2 via

  A battery sensor 8 is provided close to the battery 2 between the positive terminal of the battery 2 and the relay 6 to detect the temperature and current of the battery 2, and a rotational force of the engine 3 is transmitted via the belt 10. An alternator that charges the battery 2 with a power generation output during traveling or the like, and when a predetermined restart condition is established in a stop state by idle stop control, the belt is controlled by an idle stop control unit described later and functions as a motor. The engine 3 is restarted via 10. Information regarding whether the alternator 9 is abnormal is transmitted to the idle stop control unit 11.

  11 is an idle stop control unit formed by an idle control ECU (Electronic Control Unit), 12 is an EFI control unit formed by a fuel injection control (EFI) control ECU, and 13 is an ABS (Antilocked Braking System) control ECU. 14 is a CVT control unit formed by a CVT control ECU, and each control unit 11-14 is constituted by a microcomputer or the like, and exchanges information via a communication bus 15 such as CAN.

  Reference numeral 16 denotes a display unit formed by a dashboard combination meter, which receives various display data from the communication bus 15.

  Reference numeral 17 denotes a wheel speed sensor that gives vehicle speed detection information to the ABS control unit 13, and 18 denotes a hydraulic pressure sensor that gives detection information about the master cylinder pressure of the brake mechanism to the ABS control unit 13.

  Next, the general control and operation of the idle stop vehicle 1 will be described. When the driver turns on an IG key (not shown) to command engine start, an IG on signal is idled from the communication bus 15, for example. Based on this input, the idle stop control unit 11 is turned on by instantaneously energizing the relay 6, and the power of the battery 2 is supplied to the starter 5 to start the starter 5 and stop. The engine 3 is started (first start). For example, when the engine 3 is started and the battery 2 is once fully charged with the power generated by the alternator 9, the idle stop control unit 11 is thereafter operated until the engine 3 is stopped by the operation of turning off the IG key. Execute idle stop control. The starter 5 is used only when the engine 3 is started for the first time.

  The idle stop control unit 11 includes information on the EFI control unit 12 (engine information such as engine speed and cooling water temperature), information on the current and temperature of the battery 2, and the ABS control unit 13 via the communication bus 15. Information on the detected vehicle speed, master cylinder pressure, etc., lock-up clutch information of the CVT control unit 14, information on switches in various parts of the vehicle such as a stop lamp switch, a courtesy switch (not shown), and the like.

  Based on this information, the idle stop control unit 11 during the idle stop control confirms that the driver depresses the brake pedal according to a traffic light red signal or the like, and that the master cylinder pressure is equal to or higher than a predetermined depressing pressure. Upon detection, by confirming the establishment of a predetermined stop condition for idle stop control (for example, a condition that the stop lamp is lit and the vehicle speed is equal to or lower than the predetermined vehicle speed), the vehicle speed is lower than the predetermined vehicle speed even if the traveling is not completely stopped If the pressure drops to, the EFI control unit 12 is instructed to stop the engine, and the EFI control unit 12 throttles the fuel throttle to automatically stop the engine 3.

  Next, when the driver removes his foot from the brake pedal, for example, the traffic signal changes to a green light, and detects that the master cylinder pressure has decreased to a predetermined release pressure, the idle stop vehicle 1 performs a predetermined restart of the idle stop control. By confirming that the condition (for example, the condition that the stop lamp is turned off and the door is closed) is satisfied, the idle stop control unit 11 is turned on by instantaneously energizing the relay 6, and the power supply of the battery 2 is turned on. The power is supplied to 9 and the alternator 9 is operated as a motor, and the engine 3 stopped by the alternator 9 via the belt 10 is automatically restarted.

  Thereafter, automatic stop of the engine 3 based on establishment of a predetermined stop condition during deceleration and automatic restart of the engine 3 based on establishment of a predetermined restart condition are alternately performed.

  By the way, as described above, when the predetermined restart condition is satisfied while the engine 3 is automatically stopped while the predetermined stop condition of the idle stop control is satisfied and the engine 3 is automatically stopped during the traveling, The relay 6 is energized instantaneously and turned on, and the power source of the battery 2 is supplied to the alternator 9. Then, the alternator 9 operates as a motor, the engine 3 stopped by the alternator 9 via the belt 10 is driven, and the engine 3 is restarted.

  At this time, when the restart of the engine 3 by the alternator 9 fails, the idle stop control unit 11 performs an SOC indicating an accumulation state of the battery 2 based on the battery current, the battery temperature, and the like detected by the battery sensor 8. Is determined as the amount of stored electricity, and it is determined whether or not the amount of stored electricity when the restart control of the engine 3 fails is equal to or greater than a predetermined value (for example, 90%).

  If the charged amount is equal to or greater than the predetermined value, or if the idle stop control unit 11 has received abnormality information from the alternator 9, the relay 6 is instantaneously energized by the idle stop control unit 11 and turned on. Power is supplied to the starter 5 by the battery 2 and the restart of the engine 3 by the starter 5 is attempted. On the other hand, if the charged amount is lower than the predetermined value, the relay stop 6 is energized and turned on by the idle stop control unit 11, the power of the battery 2 is supplied to the alternator 9, and the alternator 9 tries to restart the engine 3. Is done.

  Further, if the restart of the engine 3 fails to be retried, the engine restart control by the starter 5 or the alternator 9 by the idle stop control unit 11 is repeated. Here, when the idle stop control unit 11 receives the abnormality information of the alternator 9, the abnormality of the alternator 9 is displayed on the display unit 16 under the control of the idle stop control unit 11. As described above, the function of detecting the charged amount of the battery 2 and the restart control function of the engine 3 by the idle stop control unit 11 after the failure of restart of the engine 3 correspond to the detection means and the control means in the present invention, respectively.

  Next, the control operation of the idle stop control unit 11 will be described with reference to the flowchart of FIG.

  As shown in FIG. 2, the idle stop control unit 11 confirms control conditions such as a stop condition and a restart condition of the engine 3 during traveling (step S1), and whether or not a predetermined stop condition is satisfied. A determination is made (step S2). If the determination result is NO, the process returns to step S1, and if the determination result is YES, the EFICU 12 is controlled by the idle stop control unit 11 to automatically stop the engine 3 (step S3). ).

  Then, it is determined whether or not a predetermined restart condition is satisfied while the engine is stopped by the idle stop control (step S4). If the determination result is NO, the process returns to step S1, and if the determination result is YES, The relay stop 6 is turned on instantaneously by the idle stop control unit 11 and power is supplied from the battery 2 to the alternator 9, and the alternator 9 is operated as a motor to attempt to restart the engine 3 (step S5). It is determined whether or not it is successful (step S6). If the determination result is YES, the operation ends.

  If the determination result in step S6 is NO, it is determined whether the stored amount of the battery 2 is equal to or greater than the predetermined value described above or whether the alternator 9 is abnormal (step S7), and the determination result is YES. For example, while the relay 6 is turned on instantaneously by the idle stop control unit 11 and power is supplied from the battery 2 to the starter 5 and the starter 5 is attempted to restart the engine 3 (step S8), the determination result of step S7 is NO. When it is determined that the charged amount of the battery 2 is lower than the predetermined value, the idle stop control unit 11 turns on the relay 6 instantaneously to supply power to the alternator 9 from the battery 2, and the alternator 9 is driven as a motor. The engine 3 is restarted again (step S9).

  After steps S8 and S9, it is determined whether or not the engine 3 has been successfully restarted (step S10). If this determination result is YES, the operation ends. In step S11, it is determined whether the charged amount of the battery 2 is equal to or greater than the predetermined value described above or the alternator 9 is abnormal (step S11). If the determination result is YES, the idle stop control unit 11 Then, the relay 6 is turned on instantaneously and power is supplied from the battery 2 to the starter 5, and the restart of the engine 3 by the starter 5 is retried (step S12).

  On the other hand, if the determination result in step S11 is NO and it is determined that the amount of electricity stored in the battery 2 is lower than the predetermined value, the idle stop control unit 11 turns on the relay 6 instantaneously to supply power from the battery 2 to the alternator 9. Then, the alternator 9 is driven as a motor and the engine 3 is restarted again (step S13). After steps S12 and S13, the operation ends. If the result of the engine restart attempt at Steps 12 and S13 is unsuccessful, the idle stop control unit 11 may display “restart impossible” on the display unit 16 to end the operation. .

  Therefore, according to the above-described embodiment, when the engine is restarted by the alternator 9 when the restart condition is satisfied, when the restart by the alternator 9 fails, the battery 2 detected by the idle stop control unit 11 is detected. If the charged amount is equal to or greater than a predetermined value, the engine restart by the starter 5 is tried. If the charged amount is lower than the predetermined value, the alternator 9 restarts the engine 3 again. Therefore, after the engine restart by the alternator 9 fails, the starter 5 can reliably restart the engine 3.

  On the other hand, if the charged amount of the battery 2 is lower than a predetermined value, the engine restart control by the alternator 9 is retried, and the engine restart by the alternator 9 having excellent quietness and a short start time can be performed. As a result of shortening the starting time, battery consumption can be suppressed.

  If the idle stop control unit 11 receives information that an abnormality has occurred in the alternator 9 when the alternator 9 fails to restart the engine, the idle stop control unit 11 causes the starter 5 to operate the engine 3. Therefore, the engine 3 can be reliably restarted.

  The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the spirit of the present invention.

  For example, in the above-described embodiment, whether the engine 3 is restarted by the starter 5 or the alternator 9 is restarted depending on whether or not the charged amount of the battery 2 when the restart of the engine 3 fails is greater than or equal to a predetermined value. In addition to the amount of power stored in the battery 2, the determination of whether the outside air temperature is equal to or higher than a predetermined temperature and whether the cooling water temperature of the engine 3 is equal to or higher than a predetermined temperature is added. The engine 3 may be restarted by the starter 5 or the alternator 9 may be restarted.

  In the above-described embodiment, the case where the SOC 90% is set to the predetermined value as the criterion for determining the storage amount of the battery 2 when the restart of the engine 3 fails is described. However, the predetermined value in this case is set to the SOC 90%. It is not limited.

1 Idle stop car 2 ... Battery (power storage means)
3 Engine 5 ... Starter (starting means)
9: Alternator 11 Idle stop control section (detection means, control means)

Claims (1)

When the predetermined engine stop condition is satisfied, the engine is automatically stopped, and when the predetermined restart condition is satisfied in the automatic engine stop state, the power is supplied to the start means by the power storage means to restart the engine. In the control device for the idle stop car to be started,
An alternator for generating electric power by the driving force of the engine and charging the generated electric power to the power storage means;
Detecting means for detecting the amount of electricity stored in the electricity storage means;
Control means for supplying power to the alternator by the power storage means and performing engine restart control by the alternator instead of the start means when the restart condition is satisfied,
When the engine restart control based on the establishment of the restart condition fails, the control means is controlled by the start means if the amount of power detected by the detection means is equal to or greater than a predetermined value. A control apparatus for an idle stop vehicle, wherein an engine restart is tried, and if the amount of stored electricity is lower than a predetermined value, the alternator tries to restart the engine.

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