JP5234599B2 - Power supply system fault diagnosis system for vehicle driver unit - Google Patents

Description

  The present invention relates to a system for diagnosing whether a failure has occurred in a power supply system that supplies power to a driver unit that drives a plurality of actuators such as a transmission of a vehicle.

Conventionally, as this type of system, a vehicle-mounted computer device including means for executing a failure diagnosis program has been disclosed (see, for example, Patent Document 1). In this vehicle-mounted computer apparatus, the power supply circuit includes a first circuit that passes through the main power switch of the vehicle, and a second circuit that bypasses the main power switch and passes through the second switch, and diagnoses the failure. The second switch is configured to automatically close when a fault location is detected after the program is executed. In the vehicle-mounted computer device configured as described above, when the failure location is automatically detected, even if the main power switch is turned off and the first circuit is opened, the power is received from the second circuit of the other system, and the diagnosis information By preventing the loss, it is possible to reliably grasp the failure status. In other words, by maintaining the diagnostic information retained by the self-diagnosis of this computer device without losing it, it is possible to recognize the failure status even after the service person can be involved. It has a great effect on the examination of failure countermeasures.
JP-A-62-28843 (Claim 1, specification, first page, lower right column, lines 7 to 11, specification second page, lower right column, line 4 to same page, same column, line 9)

  However, the vehicle-mounted computer device disclosed in the above-mentioned conventional patent document 1 includes two systems of the first and second circuits as the power switch circuit, and when a fault location is detected by executing the fault diagnosis program Although the first circuit is opened and the second circuit is closed, the second circuit is for holding the diagnostic information held by the self-diagnosis of the computer device without being lost, and the first circuit is opened. In other words, there is a problem that power is not supplied for vehicle control, and the vehicle cannot be driven to a service station or the like.

  The first object of the present invention is to notify the driver of the vehicle when diagnosing that the power supply system of the driver unit has failed, thereby enabling the driver to recognize the failure state at an early stage, and the main power supply circuit. Another object of the present invention is to provide a power supply system failure diagnosis system for a vehicle driver unit that can cause a vehicle to self-propel to a service station or the like even if one of the sub power supply circuits fails. A second object of the present invention is to provide a power supply system failure diagnosis system for a vehicle driver unit that can prevent malfunction of the driver unit by prioritizing the drive of the actuator by the driver unit over the power supply system failure diagnosis of the driver unit. It is to provide. The third object of the present invention is to make it possible to quickly and reliably determine the failure of the power supply system of the driver unit by relatively increasing the frequency of failure diagnosis of the power supply system of the driver unit. To provide a diagnostic system.

As shown in FIG. 1, the invention according to claim 1 includes a driver unit 12 that drives an actuator 11 of a vehicle, a main power circuit 14 that separately connects the driver unit 12 and a single power source 13, and a sub power source. A circuit 16; a monitor circuit 17 that monitors the supply state of power from the main power circuit 14 and the sub power circuit 16 to the driver unit 12; an informing means 18 that is provided in the driver's seat of the vehicle and notifies the driver; from the main power supply circuit 14 based on the detection output of the monitor circuit 17 which is obtained by switching alternately the supply of power to the driver unit 12 in the main power supply circuit 14 and the sub power source circuit 16, the secondary power supply circuit 16 and the monitor circuit 17 A power supply system failure diagnosis system for a vehicle driver unit comprising a controller 19 for diagnosing a failure and controlling the notification means 18 A.

  In the vehicle driver unit power supply system failure diagnosis system according to claim 1, when the vehicle is started, the controller 19 supplies the power supply 13 power to the driver unit 12 through the main power supply circuit 14, but the power supply 13 power is subsidized. The signal is switched to the first switching position where a signal not to be supplied through the power circuit 16 is sent to the main power circuit 14 and the sub power circuit 16, respectively. At this time, when the monitor circuit 17 detects the supply state of the power supply 13 to the driver unit 12, the controller 19 determines that the main power supply circuit 14 is normal and supplies the power supply 13 power to the driver unit 12 through the main power supply circuit 14. Although not, the signal for supplying the power 13 through the sub power circuit 16 is switched to the second switching position for sending the signal to the main power circuit 14 and the sub power circuit 16, respectively. At this time, when the monitor circuit 17 detects the supply state of the power 13 to the driver unit 12, the controller 19 determines that the sub power circuit 16 is normal, and the main power circuit 14, the sub power circuit 16, and the monitor circuit 17 Confirm that everything is normal.

  On the other hand, when the main power supply circuit 14 and the sub power supply circuit 16 are switched to the first switching position, the monitor circuit 17 cannot detect the supply of power 13 to the driver unit 12, and the main power supply circuit When the monitor circuit 17 detects the supply of power 13 to the driver unit 12 when the 14 and the sub power circuit 16 are switched to the second switching position, the controller 19 determines that the main power circuit 14 has failed. Then, the notification means 18 is controlled to notify the driver of the vehicle to that effect. Since the controller 19 supplies the power 13 with the power to the driver unit 12 through the sub power circuit 16, the vehicle can be driven by the driving operation of the driver, so that the vehicle can be quickly moved to a service station or the like. Further, when the main power circuit 14 and the sub power circuit 16 are switched to the first switching position, the monitor circuit 17 detects the supply of power 13 to the driver unit 12, and the main power circuit 14 and If the monitor circuit 17 cannot detect the supply of the power supply 13 to the driver unit 12 when the sub power supply circuit 16 is switched to the second switching position, the controller 19 again performs the main power supply circuit 14 and the sub power supply circuit 16. Is switched to the first switching position, and the monitor circuit 17 detects the supply of the power 13 to the driver unit 12, the controller 19 determines that the sub power circuit 16 has failed, and notifies the driver of the vehicle 18 of the notification means 18. To that effect. Then, the controller 19 supplies the power supply 13 power to the driver unit 12 through the main power supply circuit 14, so that the vehicle can be driven by the driving operation of the driver, so that the vehicle can be quickly moved to a service station or the like.

  Further, when the main power circuit 14 and the sub power circuit 16 are switched to the first switching position, the monitor circuit 17 cannot detect the supply of the power 13 to the driver unit 12, and the main power circuit When the monitor circuit 17 cannot detect the supply of power 13 to the driver unit 12 when the 14 and the sub power circuit 16 are switched to the second switching position, the controller 19 causes the monitor circuit 17 to fail. And the notification means 18 notifies the driver of the vehicle to that effect. And since the controller 19 supplies the power supply 13 electric power to the driver unit 12 through one or both of the main power supply circuit 14 and the sub power supply circuit 16, the vehicle can be driven by the driving operation of the driver. The vehicle can be quickly moved to a service station or the like. Further, when the monitor circuit 17 cannot detect the supply of the power 13 to the driver unit 12 in a state where the main power circuit 14 and the sub power circuit 16 are not switched to either the first or second switching position. The controller 19 determines that the monitor circuit 17 has failed and notifies the driver of the vehicle by the notification means 18. And since the controller 19 supplies the power supply 13 electric power to the driver unit 12 through one or both of the main power supply circuit 14 and the sub power supply circuit 16, the vehicle can be driven by the driving operation of the driver. The vehicle can be quickly moved to a service station or the like.

  The invention according to claim 2 is the invention according to claim 1, further comprising an operation sensor 23 for detecting an operation instruction related to the driver's actuator 11, as shown in FIG. Alternatively, when the operation sensor 23 detects the operation instruction in a state where power is supplied to the driver unit 12 through one or both of the sub power supply circuit 16, the controller 19 detects In addition, the actuator unit 11 is driven by controlling the driver unit 12 in preference to the failure diagnosis of the monitor circuit 17. In the power supply system failure diagnosis system for a vehicle driver unit described in claim 2, when the driver gives an operation instruction related to the actuator 11 (for example, operation of a shift lever), the operation sensor 23 detects this operation instruction. The controller 19 does not perform the switching operation of the main power supply circuit 14 and the sub power supply circuit 16 to the first or second switching position based on the detection output of the operation sensor 23. As a result, the driving of the actuator 11 by the driver unit 12 is prioritized over the failure diagnosis of the power supply system of the driver unit 12, so that the malfunction of the driver unit 12 can be prevented.

The invention according to claim 3 is the invention according to claim 1 or 2, and as shown in FIGS. 1 and 2, the interval for performing failure diagnosis of the main power supply circuit 14, the sub power supply circuit 16 and the monitor circuit 17 is It is characterized by being 1 minute. Further, the invention according to claim 4 is the invention according to claim 1 or 2, wherein, as shown in FIGS. 1 and 2, the unit of the driver unit 12 is generated by a signal from the main power signal line 14a of the main power circuit 14. A first time during which the power of the power supply 13 is supplied to the main body 12a and the power of the power supply 13 is not supplied to the unit main body 12a of the driver unit 12 by a signal from the sub power supply signal line 16a of the sub power supply circuit 16 ; power and does not supply power of the power supply 13 to the unit main body 12a of the driver unit 12 by a signal from the main power supply signal line 14a by the signal from the secondary power supply signal line 16a of the secondary power supply circuit 16 to the unit body 12a of the driver unit 12 of the The second time for supplying 13 electric powers is 1 second each. In the vehicle driver unit power supply system failure diagnosis system according to claims 3 and 4, the power supply system failure diagnosis frequency of the driver unit 12 is relatively increased every minute, so that the power supply of the driver unit 12 is supplied. System failure can be determined early and reliably. Although the failure diagnosis is performed at a predetermined interval, the sum of the first time and the second time is sufficiently shorter than the predetermined interval.

  According to the present invention, the main power circuit and the sub power circuit separately connect the driver unit and the power source, and the monitor circuit monitors the power supply state from the main power circuit and the sub power circuit to the driver unit. The controller diagnoses the failure of the main power supply circuit, the sub power supply circuit and the monitor circuit based on the detection output of the monitor circuit obtained by alternately switching the power supply from the power supply to the main power supply circuit and the sub power supply circuit, When it is determined that any of the main power supply circuit, the sub power supply circuit, or the monitor circuit has failed, the vehicle driver is notified that the circuit has failed. As a result, the driver can be made to recognize the failure state at an early stage. In addition, it is extremely unlikely that both the main power supply circuit and the sub power supply circuit will fail at the same time, so if the controller determines that either the main power supply circuit or the sub power supply circuit has failed, the controller will supply power to the main power supply circuit. Alternatively, the vehicle can be driven by the driver's driving operation by supplying the driver unit through a normal circuit of the auxiliary power supply circuit. As a result, the driver can quickly move the vehicle to a service station or the like.

  When the operation sensor detects an operation instruction related to the driver's actuator in a state where power is supplied to the driver unit from one or both of the main power supply circuit and the sub power supply circuit from the power supply, the controller If it is configured to drive the actuator by controlling the driver unit in preference to the failure diagnosis of the sub power supply circuit and the monitor circuit, when the driver gives an operation instruction regarding the actuator (for example, operation of the shift lever), The operation sensor detects this operation instruction, and the controller does not perform the switching operation of the main power supply circuit and the sub power supply circuit to the first or second switching position based on the detection output of the operation sensor. As a result, the controller prioritizes the drive of the actuator by the driver unit over the failure diagnosis of the power supply system of the driver unit, so that the malfunction of the driver unit can be prevented. Furthermore, if the interval of failure diagnosis of the main power supply circuit is set to 1 minute and the first time and the second time are each 1 second, the frequency of failure diagnosis of the power supply system of the driver unit becomes relatively high. The failure of the power supply system of the driver unit can be determined early and reliably.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings. As shown in FIG. 1, the power system failure diagnosis system includes a driver unit 12 that drives an actuator 11 of a vehicle, a main power circuit 14 and a sub power circuit 16 that connect the driver unit 12 and a power source 13 separately and independently. , A monitor circuit 17 for monitoring the power supply state from the main power supply circuit 14 and the sub power supply circuit 16 to the driver unit 12, a notification means 18 provided in the driver's seat of the vehicle and informing the driver, and detection of the monitor circuit 17 A controller 19 that diagnoses a failure of the main power circuit 14, the sub power circuit 16, and the monitor circuit 17 on the basis of the output and controls the notification means 18 is provided. The driver unit 12 is for driving and controlling the clutch 21 and the actuator 11 of the transmission 22 of vehicles such as trucks, buses, and passenger cars. As the actuator 11, a clutch actuator 11a for supplying / discharging pressure oil to / from the clutch booster 21a to connect / disconnect the clutch 21, or a shift fork (not shown) of the transmission 22 is moved to move a main shaft (not shown). And a shift actuator 11b connected to a transmission gear (not shown).

  The driver unit 12 includes a driver main body 12a, and a main transistor 12b and a sub-transistor 12c that separately supply the power of the power source 13 to the driver main body 12a. The main transistor 12b and the sub-transistor 12c are grounded emitter transistors, and both transistors 12b and 12c have a switching function and an amplification function, respectively. The collectors of the main transistor 12b and the subtransistor 12c are connected to the power source 13, and the emitters of the main transistor 12b and the subtransistor 12c are connected to the driver body 12a and then grounded. The notification means 18 includes a display (not shown) and a speaker (not shown) provided in the driver's seat. The display indicates that any of the main power supply circuit 14, sub power supply circuit 16 or monitor circuit 17 has failed. From the speaker, any of the main power supply circuit 14, sub power supply circuit 16 or monitor circuit 17 has failed. Configured to be announced. Further, a shift lever (not shown) operated by the driver is provided in the driver's seat, and a shift sensor 23 for detecting the operation position of the shift lever is provided in the vicinity of the shift lever. 1 is a clutch sensor that detects the on / off state of the clutch 21, and 26 is a gear stage sensor that detects the gear position of the transmission 22.

  The detection outputs of the shift sensor 23, the clutch sensor 24, and the gear position sensor 26 are connected to the control input of the controller 19, respectively. The control output of the controller 19 is connected to the notification means 18 and the driver main body 12a, respectively. One end of the monitor circuit 17 is connected to a junction point Y, which will be described later, of the emitters of the main transistor 12b and the subtransistor 12c, and the other end of the monitor circuit 17 is connected to a control input of the controller 19. The control output of the controller 19 is connected to the base of the main transistor 12b through the main power supply signal line 14a of the main power supply circuit 14, and is connected to the base of the subtransistor 12c through the sub power supply signal line 16a of the sub power supply circuit 16. The Further, the driver main body 12a is connected to the clutch actuator 11a and the shift actuator 11b, respectively. 1 is a branch point between a circuit connecting the power supply 13 and the collector of the main transistor 12b and a circuit connecting the power supply 13 and the collector of the sub-transistor 12c. 1 is a junction of a circuit that connects the emitter of the main transistor 12b and the driver main body 12a and a circuit that connects the emitter of the sub-transistor 12c and the driver main body 12a. In addition to the main power supply signal line 14a, the main power supply circuit 14 includes a main transistor 12b, a main collector line 14b between the X point and the collector of the main transistor 12b, and an emitter and Y point of the main transistor 12b. Main emitter line 14c. In addition to the sub power signal line 16a, the sub power circuit 16 includes a sub transistor 12c, a sub collector line 16b between the X point and the collector of the sub transistor 12c, an emitter of the sub transistor 12c, and a Y point. And a sub-emitter line 16c therebetween.

  The controller 19 is provided with an interval for performing failure diagnosis of the main power supply circuit 14, the sub power supply circuit 16 and the monitor circuit 17, and a signal that power is supplied to the main power supply circuit 14 and power is not supplied to the sub power supply circuit 17. A first time to be sent to the main power supply circuit 14 and the sub power supply circuit 16 respectively, and a signal that power is not supplied to the main power supply circuit 14 and power is supplied to the sub power supply circuit 16 are sent. Timers (not shown) are provided for measuring the second times respectively sent to. The interval for performing the failure diagnosis of the main power supply circuit 14, the sub power supply circuit 16, and the monitor circuit 17 is set to 1 minute. The first time and the second time are each set to 1 second. The first time and the second time may be the same time or different times as long as they are within the above ranges.

The operation of the power supply system failure diagnosis system for a vehicle driver unit configured as described above will be described with reference to the time charts of FIGS. 2 to 5 and the flowchart of FIG.
(1) When the main power supply circuit 14, the sub power supply circuit 16 and the monitor circuit 17 are normal When the driver starts the controller 19 with a key switch (not shown), the controller 19 14 is sent to the base of the main transistor 12b through the main power signal line 14a of the main power supply circuit 14 and the power of the power source 13 is supplied to the driver body 12a through the main collector line 14b, main transistor 12b and main emitter line 14c. Is sent to the base of the sub-transistor 12c through the sub-power signal line 16a of the sub-power supply circuit 16 to the base of the sub-transistor 12c. Switch (left part of FIG. 2). At this time, when the monitor circuit 17 detects the supply state of the power 13 to the driver unit 12 and this state continues for 1 second, the controller 19 determines that the main power supply circuit 14 is normal. After one second has elapsed, the controller 19 sends a signal that the power 13 power is not supplied to the driver unit 12 through the main collector line 14b, the main transistor 12b, and the main emitter line 14c of the main power circuit 14, and the main power signal of the main power circuit 14 A signal indicating that the power 13 is supplied through the sub-collector line 16b, the sub-transistor 12c and the sub-emitter line 16c of the sub-power supply circuit 16 is sent to the base of the main transistor 12b through the line 14a. Switching to the second switching position to be sent to the base of the sub-transistor 12c through the line 16a (left part of FIG. 2) At this time, when the monitor circuit 17 detects the supply state of the power 13 to the driver unit 12 and this state continues for 1 second, the controller 19 determines that the sub power supply circuit 16 is normal. The controller 19 finally determines that the main power supply circuit 14, the sub power supply circuit 16, and the monitor circuit 17 are all normal. On the other hand, in the state where electric power is supplied from the power supply 13 to the driver unit 12 through one or both of the main power supply circuit 14 and the sub power supply circuit 16, a shift lever is used for the driver to change the gear position of the transmission 22. Is operated, the shift sensor 23 detects that this shift lever has been operated. At this time, the controller 19 drives the actuator 11 by controlling the driver unit 12 in preference to the failure diagnosis of the main power supply circuit 14, the sub power supply circuit 16 and the monitor circuit 17. That is, when the driver operates the shift lever, the controller 19 does not switch the main power supply circuit 14 and the sub power supply circuit 16 to the first or second switching position based on the detection output of the shift sensor 23. Priority is given to driving the actuator 11 by the driver unit 12. As a result, malfunction of the driver unit 12 can be prevented.

(2) When the main power circuit 14 fails When the controller 19 switches the main power circuit 14 and the sub power circuit 16 to the first switching position, the monitor circuit 17 supplies the power 13 to the driver unit 12. If it cannot be detected (right part of FIG. 2) and this state continues for 1 second, the controller 19 makes a temporary determination that either the main power supply circuit 14 or the monitor circuit 17 has failed. When the controller 19 switches the main power supply circuit 14 and the sub power supply circuit 16 to the second switching position after one second has elapsed, the monitor circuit 17 detects the supply state of the power supply 13 to the driver unit 12 (FIG. 2). If the state continues for 0.1 second, the controller 19 determines that the sub power circuit 16 is normal and then determines that the main power circuit 14 has failed. Then, the controller 19 activates the notification means 18 to notify the driver that the main power supply circuit 14 has failed, and supplies power 13 to the driver unit 12 through the sub power supply circuit 16. As a result, since the vehicle can be driven by the driver's driving operation, the driver can quickly move the vehicle to a service station or the like, and the main power supply circuit 14 can be repaired at this service station.

(3) When the sub power circuit 16 fails When the controller 19 switches the main power circuit 14 and the sub power circuit 16 to the first switching position, the monitor circuit 17 supplies the power 13 to the driver unit 12. When this is detected (right part of FIG. 3) and this state continues for 1 second, it is determined that the main power supply circuit 14 is normal. After one second has elapsed, the controller 19 switches the main power supply circuit 14 and the sub power supply circuit 16 to the second switching position. At this time, if the monitor circuit 17 cannot detect the supply of the power 13 to the driver unit 12 (right part of FIG. 3) and this state continues for 1 second, the controller 19 is either the sub power circuit 16 or the monitor circuit 17. Tentatively determines that has failed. After one second has elapsed, the controller 19 switches the main power supply circuit 14 and the sub power supply circuit 16 to the first switching position again. At this time, the monitor circuit 17 detects the supply state of the power supply 13 to the driver unit 12 (right part of FIG. 3), and if this state continues for 0.1 second, the controller 19 indicates that the main power supply circuit 14 is normal. After the determination, it is finally determined that the sub power circuit 16 has failed. Then, the controller 19 operates the notification means 18 to notify the driver that the sub power supply circuit 16 has failed, and supplies power from the power supply 13 to the driver unit 12 through the main power supply circuit 14. As a result, since the vehicle can be driven by the driver's driving operation, the driver can quickly move the vehicle to a service station or the like, and the sub power circuit 16 can be repaired at this service station.

(4) When the monitor circuit 17 fails When the controller 19 switches the main power circuit 14 and the sub power circuit 16 to the first switching position, the monitor circuit 17 detects the supply of power 13 to the driver unit 12. If this is not possible (right part of FIG. 4) and this state continues for one second, the controller 19 makes a provisional determination that either the main power supply circuit 14 or the monitor circuit 17 has failed. After one second has elapsed, the controller 19 switches the main power supply circuit 14 and the sub power supply circuit 16 to the second switching position. At this time, the monitor circuit 17 cannot detect the supply of the power 13 to the driver unit 12 (right part of FIG. 4), and if this state continues for 0.1 second, the controller 19 eventually breaks down the monitor circuit 17 And confirm. Then, the controller 19 activates the notification means 18 to notify the driver that the monitor circuit 17 has failed, and the power of the power supply 13 passes through either one or both of the main power supply circuit 14 and the sub power supply circuit 17. To supply. As a result, since the vehicle can be driven by the driver's driving operation, the driver can quickly move the vehicle to a service station or the like, and the monitor circuit 17 can be repaired at this service station. On the other hand, the monitor circuit 17 can detect the supply of the power 13 to the driver unit 12 in a state where the controller 19 has not switched the main power circuit 14 and the sub power circuit 16 to either the first or second switching position. If this state continues for one second, the controller 19 determines that the monitor circuit 17 has failed. Then, the controller 19 activates the notification means 18 to notify the driver that the monitor circuit 17 has failed, and the power of the power supply 13 passes through one or both of the main power supply circuit 14 and the sub power supply circuit 16. To supply. As a result, since the vehicle can be driven by the driver's driving operation, the driver can quickly move the vehicle to a service station or the like, and the monitor circuit 17 can be repaired at this service station. When the key switch is turned off, the failure diagnosis is reset, and when the key switch is turned on next time, the failure diagnosis is performed from the beginning.

It is a block diagram which shows the power supply system failure diagnostic system of the driver unit for vehicles of this invention embodiment. It is a time chart which shows the state which the main power supply circuit failed. It is a time chart which shows the state which the sub power supply circuit failed. It is a time chart which shows the state where the monitor circuit failed. It is a time chart which shows the state where the monitor circuit failed. It is a flowchart which shows operation | movement of the power supply system failure diagnostic system when a main power supply circuit, a subpower supply circuit, or a monitor circuit fails.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Actuator 12 Driver unit 13 Power supply 14 Main power supply circuit 16 Sub power supply circuit 17 Monitor circuit 18 Notification means 19 Controller 23 Shift sensor (operation sensor)

Claims (4)

A driver unit (12) for driving the actuator (11) of the vehicle;
A main power circuit (14) and a sub power circuit (16) for separately connecting the driver unit (12) and a single power source (13), and
A monitor circuit (17) for monitoring a power supply state from the main power supply circuit (14) and the sub power supply circuit (16) to the driver unit (12);
Informing means (18) provided in the driver's seat of the vehicle to notify the driver;
The detected output of the power supply (13) said main power supply circuit supplying power to the driver unit (12) from (14) and said monitor circuit in the secondary power supply circuit (16) is obtained by switching alternately (17) And a controller (19) for diagnosing a failure of the main power supply circuit (14), the sub power supply circuit (16) and the monitor circuit (17) and controlling the notification means (18). Driver unit power supply system fault diagnosis system. It further comprises an operation sensor (23) for detecting an operation instruction related to the driver's actuator (11),
In a state where power is supplied from the power source (13) to the driver unit (12) through one or both of the main power circuit (14) and the sub power circuit (16), the operation sensor (23) performs the operation instruction. The controller (19) controls the driver unit (12) in preference to the failure diagnosis of the main power circuit (14), the sub power circuit (16) and the monitor circuit (17). The power supply system failure diagnosis system for a driver unit for a vehicle according to claim 1, wherein the system is configured to drive the actuator (11).   The power supply system fault diagnosis system for a vehicle driver unit according to claim 1 or 2, wherein the fault diagnosis interval of the main power supply circuit (14), the sub power supply circuit (16) and the monitor circuit (17) is one minute. The power of the power supply (13) is supplied to the unit body (12a) of the driver unit (12) by the signal from the main power supply signal line (14a ) of the main power supply circuit (14) and the sub power supply signal of the sub power supply circuit (16) A first time during which the power of the power source (13) is not supplied to the unit body (12a) of the driver unit (12) by a signal from the line (16a), and a main power signal line ( 14a) by the signal from the sub power supply signal line (16a) of the sub power circuit (16) without supplying the power of the power source (13) to the unit main body (12a) of the driver unit (12). The power supply system fault diagnosis system for a vehicle driver unit according to claim 1 or 2, wherein the second time for supplying the power of the power source (13 ) to the unit main body (12a) of the driver unit (12) is 1 second, respectively. .

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