WO2015037441A1

WO2015037441A1 - Control system

Info

Publication number: WO2015037441A1
Application number: PCT/JP2014/072411
Authority: WO
Inventors: 崇裕長濱
Original assignee: 株式会社オートネットワーク技術研究所; 住友電装株式会社; 住友電気工業株式会社
Priority date: 2013-09-13
Filing date: 2014-08-27
Publication date: 2015-03-19
Also published as: JP2015056857A

Abstract

　Provided is a control system that makes it possible, when re-energization is performed in a case in which self-cutoff occurs after energization has started, to energize the load in a sustained manner and drive the load normally. A controller (31) of a microcomputer (3) of the control system (1) performs an ON/OFF control, through a controller (21), on an FET (20) of an IPD (2) for connecting/disconnecting a battery (11) and an HID light (5) to/from each other. The IPD (2) has a current detector (22), and performs self-cutoff in which the IPD (2) itself switches the FET (20) off when the current detected by the current detector (22) is equal to or greater than a threshold value. The controller (31) determines whether or not the controller (21) has performed self-cutoff, and upon determining that the controller (21) has performed self-cutoff, outputs, to the controller (21), a command for performing ON/OFF control on the FET (20) so as to feed a pulse voltage to the HID light (5).

Description

Control system

The present invention relates to an instruction output device that outputs an instruction to supply power to a load from a power source such as a battery, or an instruction to shut off the power supply, and to supply power to the load according to the instruction output from the instruction output device, or to interrupt the power supply The present invention relates to a control system including a power supply control device that performs the above.

Currently, an instruction output device that outputs a power supply instruction or a cut-off instruction from the battery to a load, and a power supply control device that supplies power to the load or cuts off the power supply according to the power supply instruction or the cut-off instruction output by the instruction output device. A control system is proposed (for example, Patent Document 1).

In the control system described in Patent Document 1, the power supply control device performs power supply / interruption by turning on / off a switch provided in the middle of the electric wire connecting the battery and the load. The instruction output device receives an operation instruction / stop instruction for instructing the operation / stop of the load from the outside, and the instruction output device sends a power supply instruction / cut-off instruction according to the input operation instruction / stop instruction to the power supply control device. Output.

Electric power is supplied to the electrical components mounted on the vehicle from the power supply control device via the wires of the harness. However, if an overcurrent occurs, the wires may be burned out.
The power supply device of Patent Document 2 is configured to perform power supply / cutoff by turning on / off a transistor element, and detects an energization current of the transistor element, and the detected current value is equal to or greater than a predetermined value. In this case, the transistor element is turned off. When the transistor element is turned off, an overcurrent or a motor lock current can be considered as the cause of the off, so the control unit of the power supply apparatus determines the cause of the off based on the detected current value. In this power supply device, when it is determined that the cause of the off is the lock current of the motor, the transistor element is turned on again after a predetermined time has elapsed.

JP 2012-122869 A JP2011-223835A

When the power supply device of Patent Document 2 is an IPD (Intelligent Power Device), it accepts a power supply instruction from the above-described instruction output device, energizes the load, and an overcurrent flows through the electric wire or enters a heating state. If it is determined that the power supply is in a self-protection state, it has a self-protection function that cuts off the power supply to the load even when a power supply instruction is received from the instruction output device. In this case, when the self-blocking is released and the IPD turns on the transistor element again, a lock current is generated, so that the transistor element is also blocked and the load cannot be quickly energized.

In addition, the IPD self-protection function has the following problems.
When the load supplied with power by the IPD is, for example, an HID (High Intensity Discharge) light whose driving is controlled by ballast, a plurality of inrush currents are generated by charging the ballast capacitor after power supply is started by turning on the transistor element. May occur several times.

FIG. 6 is a graph showing the relationship between time (elapsed time) and current, with the horizontal axis representing time and the vertical axis representing current (current flowing through the ballast: A). In FIG. 6, a broken line indicates a threshold value of current for performing self-interruption. As shown in FIG. 6, immediately after the energization to the load is turned on, the current threshold is set high so that self-interruption does not occur due to the inrush current generated at this time. That is, when the first inrush current occurs, self-interruption does not occur, and energization to the load is continued.
After a predetermined time has elapsed, the threshold value is set low to protect the IPD. Therefore, when the inrush current is generated for the second time or later after the threshold value is lowered, the value of the inrush current exceeds the threshold value, so that self-interruption occurs and the power supply to the load is interrupted. As described above, the threshold value is set in two stages.
When the energization is turned on again after the self-interruption has occurred, the self-interruption may occur due to the second inrush current, so that the power cannot be continuously supplied to the load.

The present invention has been made in view of such circumstances, and when self-interruption occurs after the start of power supply, when the power is supplied again, the load continues even if the inrush current occurs multiple times. It is an object of the present invention to provide a control system that can supply power to the battery and can drive a load normally.

A control system according to the present invention includes an instruction output device that outputs an instruction to turn on / off a switch that connects / disconnects a power source and a load, and a current detection unit that detects a current flowing from the power source to the load. In accordance with the instruction input from the instruction output device, the switch is turned on / off, and when the value of the current detected by the current detection means is greater than or equal to a threshold value, the switch is turned off by itself. In the control system including the power supply control device, the instruction output device performs first self-interruption by the first determination unit that determines whether the power supply control device performs the self-interruption, and the first determination unit. Control instruction output means for outputting an instruction to control on / off of the switch so as to supply a pulse voltage to the load when determined. And butterflies.

In the present invention, when it is determined that the power supply control device has performed self-interruption, the instruction output device outputs an instruction to turn on / off the switch to supply a pulse voltage to the load to the power supply control device. Since the on / off control of the switch is repeated, the threshold of the overcurrent for determining whether or not the power supply control device performs self-cutoff is high so that the self-cutoff does not occur due to the inrush current immediately after the switch is turned on. The set state is repeated. Therefore, even when inrush current occurs multiple times after the switch is turned on, self-interruption occurs once. After canceling this self-interruption and switching to pulsed on / off control, the self-interrupt No interruption occurs, and energization is continued.

The control system according to the present invention includes a second determination unit that determines whether or not a first time has elapsed after the instruction output device outputs an instruction to turn on the switch to the power supply control device. The control instruction output means outputs an instruction to perform the on / off control when the first determination means determines that the self-blocking has been performed and the second determination means determines that the first time has elapsed. It is characterized by doing.

When the load is, for example, an HID light, after the switch is turned on, the time for generating the inrush current for the second time and thereafter is determined.
In the present invention, when an inrush current occurs two or more times after energization is turned on, and the self-interruption occurs due to the second and subsequent inrush currents, the first time is set to a time slightly before the time when the second inrush current occurs. By setting, when a self-interruption occurs after the first time has elapsed, this is based on the second inrush current. Therefore, the self-blocking can be released without any problem and switched to the pulse-like on / off control. If a fault such as a ground fault of the harness occurs before the first time has elapsed, the energization is controlled to be on, so the overcurrent threshold is lower than the threshold immediately after the energization is on, and self-interruption is ensured. Arise. At this time, it is possible to prompt the user to deal with a failure without releasing the self-blocking and switching to the pulsed on / off control.

In the control system according to the present invention, the instruction output device determines whether or not the second time longer than the first time has elapsed, and the second time elapses by the third determination means. And a means for outputting an instruction to turn on the switch when it is determined that the switch is turned on.

In the present invention, by setting the second time to a time at which no inrush current occurs, when a fault such as a ground fault of the harness occurs after the second time has elapsed and switched to on-control, an overcurrent Since the threshold value is lower than the threshold value immediately after the energization is turned on, the self-interruption surely occurs. At this time, it is possible to prompt the user to deal with a failure without releasing the self-blocking and switching to the pulsed on / off control.

According to the present invention, when it is determined that the power supply control device has performed self-interruption, the instruction output device cancels the self-interruption and instructs the switch to perform on / off control so that the pulse voltage is supplied to the load. Since the power is output to the power supply control device, even if an inrush current occurs after a predetermined time has elapsed after energization again, self-interruption does not occur based on this, and the energization is continued and the load is driven normally.

It is a block diagram which shows the principal part structure of the Example of the control system which concerns on this invention. It is a graph which shows the relationship between a control area and the electric current which flows into a ballast. It is a graph which shows the relationship between time and load output. It is a graph which shows the relationship between time and the electric current which flows into a ballast. It is a flowchart which shows the procedure of the electric power feeding / cutoff process which the control part of a microcomputer (henceforth a microcomputer) performs. It is a flowchart which shows the procedure of the electric power feeding / cutoff process which the control part of a microcomputer performs. It is a graph which shows the relationship between time and the electric current which flows into a ballast.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.

FIG. 1 is a block diagram showing a main configuration of an embodiment of a control system according to the present invention. This control system 1 is preferably mounted on a vehicle and includes an IPD 2, a microcomputer 3, a ballast 4, and an HID light 5.

The IPD 2 is connected between the positive terminal of the battery 11 and the ballast 4. The IPD 2 is further connected to the microcomputer 3. The ballast 4 is further connected to an HID light 5.
The negative terminal of the battery 11 and the ballast 4 are grounded.

The power supply instruction / interruption instruction (on instruction / off instruction) for instructing the power supply from the battery 11 to the HID light 5 or the interruption of the power supply is input from the microcomputer 3 to the IPD 2. The IPD 2 performs power supply / interruption from the battery 11 to the ballast 4 according to the input power supply instruction / interruption instruction, and the ballast 4 performs power supply / interruption to the HID light 5. The IPD 2 functions as a power supply control device.

The microcomputer 3 receives an operation instruction / stop instruction for instructing the operation or stop of the HID light 5 from the outside by an input using a user input device (not shown) or the like. The microcomputer 3 outputs to the IPD 2 a power supply instruction / cut-off instruction corresponding to an operation instruction / stop instruction input from the outside. The microcomputer 3 functions as an instruction output device.

The HID light 5 operates when power is supplied from the battery 11 and stops operating when power supply from the battery 11 is interrupted. The ballast 4 controls the operation / stop of the HID light 5. The ballast 4 includes a capacitor, and an inrush current is generated three times after power is supplied.

The IPD 2 includes an N-channel type FET (Field Effect Transistor) 20, a control unit 21, a current detection unit 22, a drive unit 23, and a self-protection unit 24. The drain of the FET 20 is connected to the positive terminal of the battery 11, the source is connected to one end of the ballast 4, and the gate is connected to the driving unit 23 and the self-protecting unit 24. Each of the current detection unit 22, the drive unit 23, and the self-protection unit 24 is connected to the control unit 21.

The FET 20 functions as a switch. When a voltage higher than a certain voltage is applied to the gate, the current flows from the drain to the gate and turns on. When the voltage applied to the gate is less than the certain voltage, Is turned off without flowing from the drain to the gate. A voltage is applied to the gate of the FET 20 by the drive unit 23, and the drive unit 23 turns the FET 20 on and off by adjusting the voltage applied to the gate of the FET 20.

The current detection unit 22 detects the load current flowing from the positive terminal of the battery 11 to the ballast 4 and outputs current value data indicating the detected load current value to the control unit 21.

The power supply instruction / cut-off instruction is input to the driving unit 23 from the microcomputer 3 via the control unit 21. When the power supply instruction is input, the drive unit 23 turns on the FET 20 and supplies power from the battery 11 to the HID light 5 via the ballast 4. When the interruption instruction is input, the drive unit 23 turns off the FET 20 and interrupts the power supply from the battery 11 to the HID light 5.

The control unit 21 receives the current value data from the current detection unit 22. When the load current value indicated by the input current value data is equal to or greater than the predetermined current value (threshold value), the control unit 21 turns off the FET 20 by the self-protection unit 24 regardless of the power supply instruction / interruption instruction output from the microcomputer 3. Thus, the power supply from the battery 11 to the HID light 5 is cut off (self-cutting).

When the power supply from the battery 11 to the HID light 5 is cut off, the control unit 21 outputs a cut-off signal indicating that the power supply has been cut off to the microcomputer 3 regardless of the power supply instruction / cut-off instruction. Here, when a power supply instruction is input from the microcomputer 3 to the IPD 2, the self-blocking is canceled.

The microcomputer 3 includes a control unit 31, a storage unit 32, a timing unit 33, an input unit 34, an output unit 35, and a notification unit 36. The control unit 31, the storage unit 32, the time measuring unit 33, the input unit 34, the output unit 35, and the notification unit 36 are each connected to a bus 37. The control unit 31 is composed of, for example, a CPU (Central Processing Unit). Each of the input unit 34 and the output unit 35 is connected to the control unit 21 of the IPD 2 in addition to the bus 37.

The input unit 34 receives the current value data from the current detection unit 22, and the input unit 34 outputs the input current value data to the control unit 31.

In the input unit 34, a cutoff signal is input from the control unit 21 of the IPD 2, and an operation instruction / stop instruction is input from the outside. The input unit 34 notifies the control unit 31 of an operation instruction / stop instruction input from the outside.

When the cutoff signal is input from the control unit 21, the input unit 34 informs the control unit 31 that the control unit 21 cuts off the power supply from the battery 11 to the HID light 5 regardless of the power supply instruction / interruption instruction. Notice.

The output unit 35 outputs a power supply instruction / cut-off instruction to the control unit 21 of the IPD 2 in accordance with an instruction from the control unit 31.
The storage unit 32 is a non-volatile memory, and the contents stored in the storage unit 32 are written and read by the control unit 31.
The notification unit 36 performs notification according to an instruction from the control unit 31. The notification unit 36 displays a message on a display unit (not shown), lights a lamp, or sounds a buzzer, for example, when self-blocking occurs and the blocking state continues as described later. Notification.

The control unit 31 instructs the output unit 35 to output to the control unit 21 of the IPD 2 a power supply instruction / stop instruction corresponding to the operation instruction / stop instruction input to the input unit 34.
In addition, when the control unit 31 outputs a power supply instruction to the control unit 21 and then inputs that the IPD 2 has performed self-shutoff, as will be described later, an on instruction and an off instruction are provided according to the elapsed time from the power supply instruction. Then, an on / off instruction is output to the control unit 21 of the IPD 2.

FIG. 2 is a graph showing the relationship between the control section and the current (current flowing through the ballast 4). Here, a case where an inrush current occurs three times will be described. In FIG. 2, the timing at which the control unit 31 outputs a power supply instruction to the control unit 21 is a time “T0”. The time T1 is set to be shorter than the time when the second inrush current occurs in the ballast 4. Time T2 is set to a time when no inrush current occurs. The control mode of the FET 20 includes a normal “ON control mode” in which the FET 20 is ON-controlled and a “rush current countermeasure mode” in which the FET 20 is ON / OFF controlled in a pulse shape.

As shown in FIG. 2, the control section includes the following three sections.
A) Overcurrent judgment section: Time T0 to T1
When the first inrush current occurs in the ballast 4 at the beginning of this section, the self-interruption determination threshold is set high as described with reference to FIG. In this section, since the second inrush current due to the ballast 4 does not occur, the IPD 2 does not normally shut off. The overcurrent threshold is lower than the threshold immediately after the energization is turned on after a predetermined time (see FIGS. 3A, 3B, and 6). When a fault such as a ground fault of the harness occurs, It certainly occurs. In this case, the “rush current countermeasure mode” is not performed, and the shut-off state is maintained and the user is notified.

B) Section for determining whether or not to implement the “rush current countermeasure mode”: time T1 to T2
In this section, a second inrush current is generated by the ballast 4. Therefore, even if it is normal, self-blocking may occur. When the self-cutoff occurs, the control unit 31 releases the self-cutoff and implements the “inrush current countermeasure mode”, and performs on / off control for a certain number of times. Since the on / off control is repeated, the state in which the threshold value immediately after turning on the FET 20 is set high as shown in FIGS. 3A, 3B, and 6 is repeated. Therefore, even when an inrush current occurs multiple times after the FET 20 is turned on, after the FET 20 is turned on again, self-interruption does not occur based on the inrush current, and energization is continued. If self-interruption occurs again during this section, it is considered that a fault such as a ground fault of the harness has occurred. Therefore, the “inrush current countermeasure mode” is not performed again, and the disconnected state is maintained.

C) Section in which "Inrush current countermeasure mode" is not implemented: Time T2 ~
In this section, since the time during which an inrush current is generated after the resumption of energization is exceeded, the self-interruption does not normally occur. Since the overcurrent threshold is lower than the threshold immediately after the energization is turned on, when a fault such as a ground fault of the harness occurs, the self-interruption surely occurs. In this case, the “rush current countermeasure mode” is not performed, and the cut-off state is maintained.

FIG. 3A is a graph showing the relationship between time and load output (voltage applied by the ballast 4 to the HID light 5: V), and FIG. 3B is a graph showing the relationship between time and current (current flowing through the ballast 4: A). It is.
When receiving the operation instruction, the control unit 31 turns on the FET 20 and supplies a certain amount of voltage to the load (on control mode).
After the elapse of time T1, a second inrush current is generated. At this time, the control unit 31 performs on / off control of the FET 20 (inrush current countermeasure mode). A first inrush current occurs after the start of the on / off control, but the self-shutoff does not occur because the threshold value of the self-shutoff determination current is high. Since ON / OFF is repeated as shown in FIG. 3B, the current threshold is always maintained at a high level. Accordingly, no self-blocking occurs when an inrush current occurs after turning on again.
After the elapse of time T2˜, the control unit 31 switches to on control (on control mode).

The detailed operation of the control unit 31 will be described below. 4 and 5 are flowcharts illustrating the procedure of the power supply / cutoff process executed by the control unit 31. FIG.
First, the control unit 31 determines whether an operation instruction has been received from the outside via the input unit 34 (S1). When it is determined that the operation instruction has not been received (S1: NO), the control unit 31 causes the control unit 21 of the IPD 2 to output a cutoff instruction via the output unit 35. As a result, the control unit 21 instructs the drive unit 23 to turn off the FET 20 (S2), and the process returns to step S1.
When it is determined that the operation instruction has been received (S1: YES), the control unit 31 causes the control unit 21 of the IPD 2 to output a power supply instruction via the output unit 35 (S3). Thereby, the control unit 21 turns on the FET 20 by the driving unit 23 and supplies power to the HID light 5 from the battery 11 via the ballast 4. The control mode of the FET 20 is an “on control mode”.

The control unit 31 starts measuring time by the time measuring unit 33 (S4).
The control unit 31 determines whether or not the IPD 2 has performed self-blocking (S5). When it is determined that the IPD 2 is not performing self-blocking (S5: NO), the control unit 31 determines whether a stop instruction has been received from the outside (S6). If it is determined that the stop instruction has not been received (S6: NO), the control unit 31 returns the process to step S5. As a result, ON is maintained until self-blocking occurs or a stop instruction is accepted.
When it is determined that the stop instruction has been received (S6: YES), the control unit 31 instructs the FET 20 to be turned off (S7), and the process returns to step S1.

When it is determined that the IPD 2 has performed self-blocking (S5: YES), the control unit 31 determines whether the time measured by the time measuring unit 33 is 0 or more and less than T1 (S8).
If the control unit 31 determines that the time is 0 or more and less than T1 (S8: YES), the self-interruption occurring in this section is due to a fault such as a ground fault in the harness as described above. 31 instructs the FET 20 to be turned off, notifies the occurrence of self-blocking by the notification unit 36, and ends the process (S16). As a result, the user can cope with the failure, and the electric wire is prevented from being burned out.

When it is determined that the time is not greater than 0 and less than T1Ｔ (S8: NO), the control unit 31 determines whether the time is greater than or equal to T1 and less than T2９ (S9). If control unit 31 determines that the time is not T1 or more and less than T2 (S9: NO), that is, if the time is determined to be T2 or more, the process proceeds to step S16. As described above, the self-interruption that occurs when the time is equal to or greater than T2 is due to a fault such as a ground fault in the harness. Therefore, the control unit 31 instructs the FET 20 to be turned off in step S16, and the notification unit 36 The occurrence of self-blocking is notified and the process is terminated.

When the control unit 31 determines that the time is T1 or more and less than T2 (S9: YES), the control unit 31 causes the control unit 21 of the IPD 2 to output an on / off control instruction via the output unit 35. Accordingly, the control unit 21 instructs the drive unit 23 to turn on / off the FET 20 (S10). The control mode of the FET 20 is switched from the “ON control mode” to the “rush current countermeasure mode”.

The control unit 31 determines whether the IPD 2 has performed self-blocking (S11). If the control unit 31 determines that the IPD 2 has performed self-interruption (S11: YES), the control unit 31 is not due to a second inrush current as described above, but due to a fault such as a ground fault in the harness. Advances the process to step S16, instructs the FET 20 to turn off in step S16, notifies the occurrence of self-blocking by the notification unit 36, and ends the process.

When it is determined that the IPD 2 is not performing self-blocking (S11: NO), the control unit 31 determines whether a stop instruction has been received from the outside (S12). When it is determined that the stop instruction has been received (S12: YES), the control unit 31 instructs the FET 20 to be turned off (S15), and the process returns to step S1.

When it is determined that the stop instruction has not been received (S12: NO), the controller 31 determines whether or not the measured time is T2 or more (S13). If the controller 31 determines that the time is not equal to or greater than T2 (S13: NO), the process returns to step S11.
If the control unit 31 determines that the time is T2 or more (S13: YES), the control unit 21 causes the drive unit 23 to output an instruction to turn on the FET 20 (S14), and the process returns to step S5.

As described above, in the present embodiment, when it is determined that the IPD 2 has performed self-blocking within the section B in FIG. 2 described above, the microcomputer 3 supplies the pulse voltage to the HID light 5. An instruction to turn on / off the FET 20 is output to the IPD 2. Since the on / off control of the FET 20 is repeated, the state where the overcurrent threshold is set high is repeated. Therefore, even when an inrush current is generated twice or more immediately after the switch is turned on and after a lapse of a predetermined time, self-interruption occurs based on the inrush current generated after switching to the on / off control. No energization is continued.

In the present embodiment, the case where the control unit 21 performs self-cutting when the load current value is equal to or greater than the predetermined current value is described, but the present invention is not limited to this. When the detected current value is greater than or equal to the threshold value, the IPD 2 performs self-interruption, and when the current value is less than the threshold value, the temperature of the electric wire is calculated based on the current value detected by the microcomputer 3, and the calculated temperature is You may comprise so that FET20 may be turned off when a threshold value is exceeded. In this case as well, self-interruption due to inrush current can be suppressed by performing on / off control of the FET 20 when self-interruption occurs once and the energization is resumed after handling the failure.

In the present embodiment, the FET 20 only needs to function as a switch. Therefore, a switch such as a P-channel FET or a bipolar transistor may be used instead of the FET 20.
Furthermore, the load is not limited when the HID light 5 is used.
When the FET 20 is on / off controlled, PWM control may be performed in which the duty ratio is adjusted to be large or small according to the magnitude of the current value detected by the current detection unit 22.

The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

The present invention relates to an instruction output device that outputs a power supply / shutoff instruction to a load from a power source such as a battery, and an IPD (Intelligent Power Device) that performs power supply / shutdown to a load in accordance with the instruction output from the instruction output device. It can utilize for a control system provided with an electric power feeding control device.

1 Control System 2 IPD (Power Supply Control Device)
20 FET
21 control part 22 current detection part (current detection means)
23 Drive unit 24 Self-protection unit 3 Microcomputer (instruction output device)
31 Control Unit 32 Storage Unit 33 Timekeeping Unit 34 Input Unit 35 Output Unit 36 Notification Unit 37 Bus 4 Ballast 5 HID Light 11 Battery

Claims

An instruction output device for outputting an instruction to turn on / off a switch for connecting / disconnecting a power source and a load;
Current detection means for detecting a current flowing from the power source to the load, and the switch is turned on / off according to the instruction input from the instruction output device, and a current value detected by the current detection means is In a control system comprising: a power supply control device that performs self-shut-off that turns off the switch when the threshold is equal to or greater than
The instruction output device includes:
First determination means for determining whether or not the power supply control device has performed the self-interruption;
Control instruction output means for outputting an instruction for on / off control of the switch so as to supply a pulse voltage to the load when the first determination means determines that the self-cutoff has been performed. Control system.
The instruction output device includes:
A second determination unit for determining whether or not a first time has elapsed after outputting an instruction to turn on the switch to the power supply control device;
The control instruction output means outputs an instruction to perform the on / off control when the first determination means determines that the self-blocking has been performed and the second determination means determines that the first time has elapsed. The control system according to claim 1.
The instruction output device includes:
Third determination means for determining whether a second time longer than the first time has elapsed;
The control system according to claim 2, further comprising: a unit that outputs an instruction to turn on the switch when the third determination unit determines that the second time has elapsed.