JP2017120191A - Failure determination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a failure determination device capable of improving the reliability of failure determination of a voltage sensor while avoiding electric shock of a charging worker.SOLUTION: In a state that a first main contactor and a second main contactor are ON, after turning ON either a first forcible leak circuit or a second forcible leak circuit, when a voltage sensor detects a voltage, a control unit evaluates the validity of the voltage detection of the voltage sensor. Determining that no voltage is detected, the control unit determines whether a leakage detection circuit detects an electrical leak. When any electrical leak is detected, the control unit evaluates the validity the non-detection of voltage by the voltage sensor.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a failure determination device that determines a failure of a voltage sensor.

  A quick charge connector provided to charge the battery for driving an electric vehicle, provided with a quick charge contactor between the main contactor and the quick charge connector so that no voltage is generated outside except during quick charge. It has been known.

  On the other hand, in order to detect whether or not a voltage is applied to the quick charge connector other than during quick charge, for example, as shown in FIG. 10, the quick charge contactor Cmp and the quick charge contactor Cmn, A total voltage sensor provided between the two is known. The total voltage sensor is a device that transmits a voltage detection signal (ON) to the control device (BMU) when the threshold voltage is exceeded, and transmits a voltage detection signal (OFF) when the voltage falls below the threshold voltage.

  In the failure determination device including such a quick charge connector, when both the quick charge contactors Cmp and Cmn are in an OFF state and the vehicle is not moving, that is, when the total voltage sensor is ON during non-rapid charge, It is known that the control device determines that there is a risk of electric shock to the worker through the quick charge connector because the total voltage sensor is broken, and performs control to turn off the main contactor and ensure the safety of the worker. ing.

  Further, in the relay welding diagnosis apparatus, when the relay is provided on each of the P pole side and the N pole side between the vehicle and the quick charging facility and charging is performed, the first voltage detection is performed before both of the relays are turned on. A technique is known in which a circuit diagnosis is performed, a second voltage detection circuit diagnosis is performed when both relays are turned on, and the circuit diagnosis unit determines whether or not the voltage detection circuit has failed in both diagnoses. (See Patent Document 1 below).

JP 2013-207961 A

  In the circuit configuration shown in FIG. 10, since the total voltage sensor is a single system, the validity of the ON / OFF signal transmitted from the total voltage sensor cannot be determined. That is, there is a possibility that the total voltage sensor has failed and is transmitting an ON / OFF signal, but this cannot be determined.

  Here, it is conceivable to determine the validity of the ON / OFF signal of the total voltage sensor by providing another total voltage sensor in the circuit configuration and making the total voltage sensor a double system. However, providing another total voltage sensor leads to an increase in the cost of manufacturing the failure determination device.

  In the case of a circuit configuration in which two total voltage sensors are provided, no voltage is generated in the quick charge contactor in order for the control device to determine whether the main contactor may be turned on again (total voltage sensor). Is not detecting the voltage). At this time, the main contactor must be turned on in order to execute the determination that the control device detects that the total voltage sensor is OFF. At that time, depending on the state of the quick charge contactor, there is a risk of an electric shock from an operator who performs quick charge.

  Therefore, even if only the total voltage sensor is set to the double system, the electric shock risk of the worker cannot be re-examined after the electric shock protection measure, and the product including the failure determination device, for example, restart by the vehicle (both mains There arises a problem that the contactor cannot be turned on.

  Further, since the total voltage sensor is connected to the quick charge connector, for example, it is possible to execute the quick charge contactor welding determination by the vehicle alone, but if the welding determination is performed when the vehicle is stopped, there is a risk of electric shock to the operator. There are limited situations in which the control device can perform welding determination.

  That is, in the circuit configuration shown in FIG. 10, the validity of the ON / OFF signal of the total voltage sensor cannot be determined, and if the quick charge contactor is turned ON again to make the total voltage sensor detect the voltage, the operator There is a risk of electric shock (as described above, once the electric shock prevention function is activated, for example, the vehicle alone cannot be restarted). Similarly, if the total voltage sensor is used to determine the welding of the quick charge contactor Then there is a risk of electric shock to the worker.

  The present invention has been made in view of the above circumstances, and can improve the reliability of voltage sensor failure determination with an inexpensive configuration and can avoid the risk of electric shock of an operator who performs rapid charging. An object is to provide a failure determination device.

  The failure determination device of the present invention includes a battery, a first charging connector used for charging the battery, a second charging connector used in a pair with the first charging connector for charging the battery, A first main contactor provided between one end of the battery and the first charging connector; a second main contactor provided between the other end of the battery and the second charging connector; A first charging contactor provided between the first main contactor and the first charging connector; a second charging contactor provided between the second main contactor and the second charging connector; A voltage for detecting a voltage between the first charging contactor and the first charging connector and between the second charging contactor and the second charging connector. And a leakage detecting circuit for detecting a leakage of a power supply circuit for supplying power from the battery, and between the first charging contactor and the first charging connector to forcibly generate a leakage. A first forced leakage circuit; a second forced leakage circuit that is connected between the second charging contactor and the second charging connector and forcibly generates a leakage; and the first main contactor; Controlling the second main contactor, the first charging contactor, the second charging contactor, the leakage detection circuit, the first forced leakage circuit, and the second forced leakage circuit, and detecting the leakage And a control unit that receives a first signal indicating detection of leakage from the circuit and a second signal indicating detection of voltage from the voltage sensor.

  Further, the control unit, after the first main contactor and the second main contactor are ON, after turning on either the first forced leakage circuit and the second forced leakage circuit, A first determination unit that determines whether or not the second signal is received from the voltage sensor; and a voltage of the voltage sensor when the first determination unit determines that the second signal is received. When the first validity evaluation means for evaluating the validity of detection and the first determination means determine that the second signal is not received, the first signal is received from the leakage detection circuit. A second determination unit that determines whether or not the first signal is received by the second determination unit; and a second determination unit that evaluates validity of voltage non-detection of the voltage sensor. And a validity evaluation means. That.

  The first validity evaluation means determines whether or not the first charging contactor is welded by using the first forced leakage circuit, and uses the second forced leakage circuit to Whether the first charging contactor and the second charging contactor are welded together, the voltage sensor is determined to be normal, and the first charging contactor is determined to be normal. When the first charging contactor and the second charging contactor are not welded together, the voltage sensor is determined to be abnormal.

  The second validity evaluation means determines whether or not the first charging contactor is welded using the first forced leakage circuit, and uses the second forced leakage circuit to determine the first validity leakage circuit. And determining whether or not the second charging contactor is welded. If it is determined that the first charging contactor is welded, the voltage sensor is turned on when the second charging contactor is determined to be welding. It may be determined that the voltage sensor is abnormal, and the voltage sensor may be determined to be normal under a certain condition when the second charging contactor is not welded.

  The second validity evaluation means determines whether or not the first charging contactor is welded using the first forced leakage circuit, and uses the second forced leakage circuit. If it is determined whether the second charging contactor is welded and it is determined that the first charging contactor is welded, the voltage sensor has detected a voltage, or the second charging contactor Until the contactor is determined to be welded, the voltage sensor voltage detection determination and the second charging contactor welding determination are repeated, the voltage sensor detects ON, and the second charging contactor If it is determined that is a weld, the voltage sensor may be determined to be normal.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to improve the reliability of the failure determination of a voltage sensor with an inexpensive structure, the failure determination apparatus which can avoid the electric shock risk of the operator who performs quick charge can be provided.

The figure which shows an example of schematic structure of the failure determination apparatus which concerns on embodiment of this invention. The flowchart which shows an example of the failure determination process which the control part which concerns on the same embodiment performs. The flowchart which shows an example of the ON detection validity confirmation process which the control part which concerns on the same embodiment performs. The figure for demonstrating the failure determination result of a control part based on the ON detection validity confirmation process which concerns on the same embodiment. It is a flowchart which shows an example of the 1st OFF detection validity confirmation process which the control part which concerns on the same embodiment performs. The figure for demonstrating the failure determination result of a control part based on the 1st OFF detection validity confirmation process which concerns on the same embodiment. The flowchart which shows an example of the 2nd OFF detection validity confirmation process which the control part which concerns on the 2nd Embodiment of this invention performs. The figure for demonstrating the failure determination result of a control part based on the OFF detection validity confirmation process which concerns on the same embodiment. The flowchart which shows an example of the restart determination process which the control part which concerns on the 3rd Embodiment of this invention performs. The figure which shows the structure of the failure determination apparatus in a prior art example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram illustrating an example of the configuration of the failure determination apparatus 1. The failure determination device is, for example, a failure of a voltage sensor for ensuring safety for an operator when a vehicle using a motor that operates with electric power supplied from a driving battery performs charging from a quick charging device. It is an apparatus which determines. Note that the failure determination device is not limited to being applied to a vehicle that uses a motor as a drive source, but is a device that includes a voltage sensor that ensures safety for an operator when performing rapid charging from the rapid charging device. Can be applied to.

  As shown in FIG. 1, the driving battery V is connected to the main contactor 11. The main contactor 11 is a contactor for turning ON / OFF the driving battery V, the high voltage load 13 and the quick charging connector 15. The main contactor 11 is connected to the quick charging connector 15 by the power supply path 12.

  More specifically, the main contactor 11 includes a P-side main contactor (first main contactor) 11p and an N-side main contactor (second main contactor) 11n. The quick charge connector 15 includes a P-side quick charge connector (first quick charge connector) 15p and an N-side quick charge connector 15 (second quick charge connector) n. Furthermore, the power supply path 12 includes a P-side power supply path 12p and an N-side power supply path 12n. The P-side quick charge connector 15p is used for quick charging of the drive battery V, and the N-side quick charge connector 15n is used for pairing with the P-side quick charge connector 15p for quick charge of the drive battery V. .

  In addition, a quick charge contactor 14 is provided in the power supply path 12 that connects the main contactor 11 and the quick charge connector 15. The quick charge contactor 14 is a contactor for turning on and off the main contactor 11 and the quick charge connector 15.

  More specifically, the quick charge contactor 14 includes a P-side quick charge contactor (first quick charge contactor) 14p and an N-side quick charge contactor (second quick charge contactor) 14n. The P-side quick charge contactor 14p is provided in the power supply path 12p between the P-side main contactor 11p and the P-side quick charge connector 15p. The N-side quick charge contactor 14n is provided in the power supply path 12n between the N-side main contactor 11n and the N-side quick charge connector 15n.

  The high voltage load 13 is, for example, a motor. The motor is, for example, a vehicle drive source. One end of the high-voltage load 13 is connected to the P-side power supply path 12p between the P-side main contactor 11p and the P-side quick charge contactor 15p, and the other end is connected to the N-side main contactor 11n and the N-side quick charge contactor 15n. It is connected to the N-side power supply path 12n.

  The total voltage sensor 16 is a sensor that detects the voltage Vd of the voltage supply path 12 in order to ensure safety for an operator who performs quick charging. One end of the total voltage sensor 16 is connected to the P-side power supply path 12p between the P-side quick charge contactor 14p and the P-side quick charge connector 15p, and the other end is connected to the N-side quick charge contactor 14n and the N-side quick charge connector 15n. To the N-side power supply path 12n.

  The failure determination device 1 is provided with a forced leakage device (first forced leakage circuit) Cp that generates forced leakage in the power supply path 12 and a forced leakage circuit (second forced leakage circuit) Cn. In the first embodiment, a forced leakage circuit Cp is connected to the P-side power supply path 12p between the P-side quick charge contactor 14p and the P-side quick charge connector 15p, and the N-side quick charge contactor 14n and the N-side A forced leakage circuit Cn is connected to the N-side power supply path 12n between the quick charge connector 15n.

  The forced leakage circuit Cp includes a switch SWp and a resistor Rp connected to the ground, and is configured such that the switch SWp operates based on a forced leakage drive signal Sp received from a BMU (described later) 31. The power supply path 12p and the resistor Rp are connected / disconnected in accordance with the forced leakage drive signal Sp, and the forced leakage circuit Cp is configured to be forcibly leakable.

  Similarly to the forced leakage circuit Cp, the forced leakage circuit Cn includes a switch SWn and a resistor Rn connected to the ground so that the switch SWn operates based on the forced leakage drive signal Sn received from the BMU 31. It is configured. The power supply path 12n and the resistor Rn are connected / disconnected in accordance with the forced leakage drive signal Sn, and the forced leakage circuit Cn is configured to be forcibly leaked.

  Furthermore, the failure determination apparatus 1 is provided with a leakage detection circuit 17. The leakage detection circuit 17 is a circuit that detects whether or not a leakage has occurred in the power supply path 12. The line extending from the leakage detection circuit 17 is branched at the connection point 18, one line is connected to the N-side main contactor 11n, and the other line is connected to the driving battery V.

  As described above, the failure determination device 1 includes the P-side main contactor 11p, the N-side main contactor 11n, the P-side power supply path 12p, the N-side power supply path 12n, the high voltage load 13, the P-side quick charge contactor 14p, N-side quick charge contactor 14n, N-side quick charge connector 15n, P-side quick charge connector 15p, total voltage sensor 16, leakage detection circuit 17, forced leakage circuits Cp and Cn, connection point 18, and drive battery V are included. .

  The leakage detection circuit 17 includes a signal generator 19, a capacitor 20, a filter 21, and a detection circuit 22. The line extending from the signal generator 19 is connected to the connection point 18 through the capacitor 20. One end of the filter 21 is connected between the signal generator 19 and the capacitor 20, and the other end of the filter 21 is connected to the detection circuit 22.

  In the leakage detection circuit 17 configured as described above, a signal is output from the signal generator 19 when leakage is detected, whereby charging and discharging of the capacitor 20 is periodically repeated. Here, the charging / discharging cycle of the capacitor 20 when no leakage occurs in the power supply path 12 is different from the charging / discharging cycle of the capacitor 20 when leakage occurs in the power supply path 12. This is because the resistance value changes in the power supply path 12 at the time of electric leakage. The detection circuit 22 detects the charging / discharging cycle (or time) of the capacitor 20 via the filter 21.

  In addition, the leakage detection circuit 17 performs leakage detection control based on the control of a BMU (Battery Management Unit) 31.

  More specifically, the leakage detection circuit 17 outputs a signal to the capacitor 20 based on an instruction from the BMU 31 and detects the charge / discharge cycle (or time) of the capacitor 20. In addition, the leakage detection circuit 17 compares the detection result with the charge / discharge cycle (or time) of the capacitor 20 when the leakage does not occur when the leakage does not occur, and based on the comparison result. Then, it is determined whether or not a leakage has been detected, and a leakage detection signal indicating whether or not a leakage has been detected is output to the BMU 31. In the present embodiment, the leakage detection signal is a signal (ON: first signal) output to the BMU 31 when leakage is detected, and a signal (OFF) is output when leakage is not detected. I will explain it.

  The BMU 31 executes charge control, temperature control, cooling control, and the like of the drive battery V in accordance with instructions from an ECU (Electronic Control Unit: not shown).

  Further, the BMU 31 transmits a control signal instructing the leakage detection circuit 17 to execute leakage detection, and receives a leakage detection signal indicating the result of leakage detection from the leakage detection circuit 17. In the present embodiment, the BMU 31 determines whether or not a leakage has been detected in the power supply path 12 based on whether or not a leakage detection signal (ON) is received.

  Further, when the total voltage sensor 16 detects a voltage, the BMU 31 receives a voltage detection signal (ON: second signal) from the total voltage sensor 16. Therefore, the BMU 31 can detect whether or not a voltage is generated between the quick charge contactor 14 and the quick charge connector 15 based on whether or not the voltage detection signal is received from the total voltage sensor 16. it can.

  Further, the BMU 31 controls each of the contactors (P-side main contactor 11p, N-side main contactor 11n, P-side quick charge contactor 14p, and N) in addition to the control of the leakage detection circuit 17 and the reception control of the voltage detection signal from the total voltage sensor 16. ON / OFF control of the side quick charge contactor 14n), forced leakage control of the forced leakage circuits Cp and Cn, and operation control of the high voltage load 13 are executed.

  Next, failure determination processing executed by the BMU 31 will be described. FIG. 2 is a flowchart illustrating an example of a failure determination process executed by the BMU 31. The BMU 31 executes this failure determination process as appropriate (for example, at predetermined time intervals).

  The following processing is based on the premise that both the P-side main contactor 11p and the N-side main contactor 11n are ON, and both the P-side quick charge contactor 14p and the N-side quick charge contactor 14n are OFF. It is. In addition, it is desirable to execute the following processing after the BMU 31 confirms that the operation of the leakage detection circuit 17 is normal by a leakage check or the like.

  First, the BMU 31 controls the forced leakage circuit Cp or Cn and turns on one of the forced leakage circuits (ST101). In the present embodiment, the case where the forced leakage circuit Cp is first turned on will be described. However, the present invention is not limited to this order, and the forced leakage circuit Cn may be turned on first. The BMU 31 forcibly leaks the forced leakage circuit Cp by outputting the forced leakage drive signal Sp to the forced leakage circuit Cp and connecting the switch SWp to the resistor Rp.

  Next, the BMU 31 determines whether or not the total voltage sensor 16 has detected ON (that is, generation of a voltage) based on whether or not a voltage detection signal has been received from the total voltage sensor 16 (ST102: No. 1). 1 determination means).

  When it is determined that the total voltage sensor 16 has detected ON (ST102: YES), the BMU 31 confirms the validity of the ON detection of the total voltage sensor 16 (ST103: first validity evaluation means). The ON detection validity confirmation processing of the total voltage sensor 16 will be described later with reference to FIGS.

  If it is determined that the total voltage sensor 16 has not detected ON (ST102: NO), has the BMU 31 detected a leakage in the power supply path 12 based on the leakage detection signal received from the leakage detection circuit 17? It is determined whether or not (ST104). It is desirable that the BMU 31 executes a process for separating the leakage of the power supply path 12, that is, the leakage of the high voltage path or the leakage of the forced leakage circuit Cp (welding of the P-side quick charge contactor 14p). For example, the BMU 31 may determine which of the leakages is based on the detected voltage level, and determine whether the leakage is in the high voltage path or the leakage in the forced leakage circuit Cp.

  When it is determined that the BMU 31 has not detected a leakage (ST104: NO), the process returns to the determination in step ST102.

  When it is determined that the BMU 31 has detected a leakage (ST104: YES), the BMU 31 confirms the validity of the OFF detection of the total voltage sensor 16 (ST105: second validity evaluation unit). Two processes can be considered for the OFF detection validity confirmation process of the total voltage sensor 16. For this reason, in the first embodiment, the first OFF detection validity confirmation process will be described later with reference to FIGS. 5 and 6. In the second embodiment, the second OFF detection validity confirmation is performed. The processing will be described later with reference to FIGS.

  Next, the ON detection validity checking process for checking the validity of the ON detection of the total voltage sensor 16 will be described. FIG. 3 is a flowchart showing an example of the ON detection validity confirmation process executed by the BMU 31.

  As shown in FIG. 3, first, as described above, the BMU 31 controls the forced leakage circuit Cp, turns on the forced leakage circuit Cp (ST201), and confirms that the total voltage sensor 16 is detected to be ON in this state. Confirm (ST202).

  Next, the BMU 31 controls the N-side main contactor 11n and turns off the N-side main contactor 11n (ST203).

  Next, the BMU 31 determines whether or not the total voltage sensor 16 has detected OFF (ST204).

  When it is determined that the total voltage sensor 16 has not been detected to be OFF (ST204: NO), the BMU 31 confirms that the OFF detection of the total voltage sensor 16 is abnormal (ST205). In addition, when determining the welding of a quick charge contactor, you may make it BMU31 perform the welding determination process using the forced leak circuits Cp and Cn, without complete | finishing a process. In this case, when the process of step ST205 ends, the process proceeds to step ST207.

  If it is determined that the total voltage sensor 16 has detected OFF (ST204: YES), the BMU 31 confirms that the OFF detection of the total voltage sensor 16 is normal (ST206).

  Next, the BMU 31 determines whether or not leakage has been detected based on the leakage detection signal from the leakage detection circuit 17 (ST207).

  When it is determined that the leakage is detected (ST207: YES), the BMU 31 controls the forced leakage circuit Cp and turns off the forced leakage circuit Cp (ST208).

  Next, the BMU 31 determines, based on the leakage detection signal from the leakage detection circuit 17, whether or not non-leakage has been detected, that is, whether or not leakage has been detected after the forced leakage circuit Cp is turned OFF ( ST209).

  When it is determined that it is not non-leakage detection (ST209: NO), the BMU 31 confirms that it is normal leakage (ST210).

  When it is determined that non-leakage detection is detected (ST209: YES), the BMU 31 confirms that the P-side quick charge contactor 14p is welded (ST211).

  On the other hand, when it is determined in step ST207 that the leakage detection is not detected (ST207: NO), the BMU 31 confirms non-welding of the P-side quick charge contactor 14p (ST212).

  After executing the process of step ST212 or ST212, the BMU 31 controls the P-side main contactor 11p to turn off the P-side main contactor 11p (ST213).

  The BMU 31 can execute the welding determination of the P-side quick charge contactor 14p by the processing from the above-described steps ST207 to ST213.

  After performing the welding determination of the P-side quick charge contactor 14p, the BMU 31 controls the N-side main contactor 11n, turns on the N-side main contactor 11n (ST214), controls the forced leakage circuit Cn, and forces the leakage circuit. Cn is turned on to generate a leakage (ST215).

  Next, the BMU 31 determines whether or not leakage has been detected based on the leakage detection signal received from the leakage detection circuit 17 (ST216).

  When it is determined that the leakage is detected (ST216: YES), the BMU 31 controls the forced leakage circuit Cn, turns off the forced leakage circuit Cn, and stops the forced leakage (ST217).

  Next, the BMU 31 confirms the welding of the N-side quick charge contactor 14n (ST218).

  When it is determined that the leakage detection is not performed (ST216: NO), the BMU 31 confirms non-welding of the N-side quick charge contactor 14n (ST219).

  The BMU 31 can execute the welding determination of the N-side quick charge contactor 14n by the processing from the above-described steps ST214 to ST219.

  Next, the BMU 31 executes a failure determination process for the total voltage sensor 16 (ST220). A determination method of the failure determination process in the ON detection validity confirmation process will be described later with reference to FIG.

  After any one of steps ST205, ST210, and ST220 is completed, the BMU 31 turns off both the main contactors 11, that is, the P-side main contactor 11p and the N-side main contactor 11n (ST221), and performs the processing. finish.

  FIG. 4 is a diagram for explaining the failure determination result T1 of the BMU 31 based on the ON detection validity confirmation process.

  As shown in FIG. 4, the BMU 31 can obtain a failure determination result from a combination of the welding determination result of the P-side quick charge contactor 14p and the welding determination result of the N-side quick charge contactor 14n.

  When both the P-side quick charge contactor 14p and the N-side quick charge contactor 14n are welded, it is determined that both the total voltage sensor 16 and the forced leakage circuits Cp and Cn are normal.

  When the P-side quick charge contactor 14p is welded and the N-side quick charge contactor 14n is not welded, it is determined that the forced leakage circuit Cn is abnormal.

  When the P-side quick charge contactor 14p is not welded and the N-side quick charge contactor 14n is welded, it is determined that the forced leakage circuit Cp is abnormal.

  When both the P-side quick charge contactor 14p and the N-side quick charge contactor 14n are not welded, it is determined that both the total voltage sensor 16 and the forced leakage circuits Cp and Cn are abnormal.

  As described above, the BMU 31 obtains failure determination results for the total voltage sensor 16 and the forced leakage circuits Cp and Cn.

  Next, the first OFF detection validity checking process for checking the validity of the OFF detection of the total voltage sensor 16 will be described. FIG. 5 is a flowchart illustrating an example of the first OFF detection validity checking process executed by the BMU 31.

  As shown in FIG. 5, first, as already described (refer to FIG. 2), the BMU 31 controls the forced leakage circuit Cp and turns on the forced leakage circuit Cp (ST301). In this state, the leakage detection circuit 17 Confirms that leakage has been detected (ST302).

  Next, the BMU 31 controls the forced leakage circuit Cp and turns off the forced leakage circuit Cp (ST303).

  Next, the BMU 31 determines based on the leakage detection signal from the leakage detection circuit 17 whether it is non-leakage detection, that is, whether leakage has not been detected after the forced leakage circuit Cp is turned OFF (ST304). ).

  When it is determined that it is not non-leakage detection (ST304: NO), the BMU 31 confirms that it is normal leakage (ST305).

  When it is determined that non-leakage is detected (ST304: YES), the BMU 31 confirms that the P-side quick charge contactor 14p is welded (ST306).

  The BMU 31 can execute the welding determination of the P-side quick charge contactor 14p by the processes of the above-described steps ST303, ST304, and ST306.

  Next, the BMU 31 controls the forced leakage circuit Cn to turn on the forced leakage circuit Cn (ST307).

  Next, the BMU 31 determines whether or not leakage has been detected based on the leakage detection signal from the leakage detection circuit 17 (ST308).

  When it is determined that the electric leakage is detected (ST308: YES), the BMU 31 confirms the welding of the N-side quick charge contactor 14n (ST309).

  If it is determined that the leakage detection is not detected (ST308: NO), the BMU 31 confirms non-welding of the N-side quick charge contactor 14n (ST310).

  Next, the BMU 31 controls the forced leakage circuit Cn and turns off the forced leakage circuit Cn (STST 311).

  The BMU 31 can execute the welding determination of the N-side quick charge contactor 14n by the processing of the above-described steps ST307 to ST310.

  Next, the BMU 31 executes a failure determination process for the total voltage sensor 16 (ST312). A determination method of the failure determination process in the first OFF detection validity confirmation process will be described later with reference to FIG.

  When the processes of steps ST305 and ST312 are completed, the BMU 31 turns off both the main contactor 11, that is, the P-side main contactor 11p and the N-side main contactor 11n as necessary (ST313). Under what conditions, the main contactor 11 is turned off based on a predetermined policy. Note that the processing in step ST313 may not be provided.

  FIG. 6 is a diagram for explaining the failure determination result T2 of the BMU 31 based on the first OFF detection validity confirmation process. It is assumed that the P-side quick charge contactor 14p is welded (see ST306).

  As shown in FIG. 6, when the N-side quick charge contactor 14n is welded, it is determined that the total voltage sensor 16 is abnormal. When the N-side quick charge contactor 14n is not welded, it is determined that the total voltage sensor 16 is normal under certain conditions. The constant condition is, for example, that when the N-side quick charge contactor 14n is not welded, the total voltage sensor 16 does not react, so that the forced leakage circuit Cn is not fixed OFF. Whether or not the forced leakage circuit Cn is fixed OFF may be confirmed, for example, by duplicating the forced leakage circuit.

  According to the failure determination device 1 configured as described above, the reliability of failure determination of the total voltage sensor 16 can be improved, and the risk of electric shock of an operator who performs quick charging can be avoided.

  Furthermore, since it is possible to improve the reliability of failure determination of the total voltage sensor 16 by providing only one total voltage sensor 16, in other words, without providing two or more voltage sensors, the failure determination device 1 Can be made cheaper.

(Second Embodiment)
In the second embodiment, the second OFF detection validity confirmation process will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the structure same as 1st Embodiment, and suppose that detailed description is abbreviate | omitted.

  FIG. 7 is a flowchart showing an example of the second OFF detection validity confirmation process executed by the BMU 31. Note that the processing in steps ST401 to ST407 is the same as the processing in steps ST301 to ST307, and thus detailed description thereof will be omitted, and the processing after step ST408 will be described in detail.

  As shown in FIG. 7, when the process of step ST407 ends, the BMU 31 determines whether or not the total voltage sensor 16 is ON detection based on the voltage detection signal received from the total voltage sensor 16 (ST408). .

  When it is determined that the total voltage sensor 16 is ON detection (ST408: YES), the BMU 31 confirms that the total voltage sensor 16 is ON (ST409).

  When it is determined that the total voltage sensor 16 is not ON detection (ST408: NO), the BMU 31 confirms that the total voltage sensor 16 is OFF (ST410).

  The BMU 31 can determine whether or not the total voltage sensor 16 is performing voltage detection (total voltage sensor detection determination) by the processing of the above-described steps ST408 to ST410.

  When the process of step ST409 or ST410 is completed, the BMU 31 determines whether or not the leakage detection is based on the leakage detection signal received from the leakage detection circuit 17 (ST411).

  When it is determined that the leakage is detected (ST411: YES), the BMU 31 confirms the welding of the N-side quick charge contactor 14n (ST412).

  If it is determined that there is no leakage detection (ST411: NO), the BMU 31 confirms non-welding of the N-side quick charge contactor 11n (ST413).

  The BMU 31 can execute the welding determination of the N-side quick charge contactor 11n by the processing from the above-described steps ST407 to ST413.

  Next, the BMU 31 executes a failure determination process for the total voltage sensor 16 (ST414). A determination method of the failure determination process in the second OFF detection validity confirmation process will be described later with reference to FIG.

  Next, whether the BMU 31 is a leakage detection based on a leakage detection signal received from the leakage detection circuit 17 or whether the total voltage sensor 16 is an ON detection based on a voltage detection signal received from the total voltage sensor 16. It is determined whether or not (ST415).

  When it is determined that the BMU 31 does not detect leakage or the total voltage sensor 16 does not detect ON (ST415: NO), the process returns to step ST408. Thus, the processing is repeated until it is determined whether the total voltage sensor 16 is ON detection or whether the P-side and N-side quick charge contactors 14p, 14n are both welded.

  When it is determined that the BMU 31 detects leakage or the total voltage sensor 16 detects ON (ST415: YES), the BMU 31 controls the forced leakage circuit Cn and turns off the forced leakage circuit Cn (ST416).

  Next, the BMU 31 turns off the main contactor 11 as necessary (ST417). Since the process of step ST417 is the same process as step ST313 described above, detailed description thereof is omitted.

  FIG. 8 is a diagram for explaining the failure determination result T3 of the BMU 31 based on the second OFF detection validity confirmation process. It is assumed that the P-side quick charge contactor 14p is welded (see ST406).

  As shown in FIG. 8, when the total voltage sensor 16 is ON detected and the N-side quick charge contactor 14n is welded, it is determined that the total voltage sensor 16 is normal.

  When the total voltage sensor 16 is ON detection and the N-side quick charge contactor 14n is not welded, it is determined that the forced leakage circuit Cn is abnormal.

  When the total voltage sensor 16 is OFF detection and the N-side quick charge contactor 14n is welded, it is determined that the total voltage sensor 16 is abnormal (fixed OFF).

  If the total voltage sensor 16 is OFF detection and the N-side quick charge contactor 14n is not welded, the processing is continued until the total voltage sensor 16 detects ON or the side quick charge contactor 14n is detected to be welded. Is repeated.

  According to the failure determination device 1 of the second embodiment, the same effects as the failure determination device 1 of the first embodiment can be obtained.

  Further, the failure determination device 1 reliably detects whether the total voltage sensor 16 is ON detection or the N-side quick charge contactor 14n is both welded when the P-side quick charge contactor 14p is welded. Can do.

(Third embodiment)
Next, a third embodiment will be described. The third embodiment is different in that the BMU 31 executes a restart determination process in addition to the processes of the first and second embodiments. In addition, the same code | symbol is attached | subjected to the structure same as 1st Embodiment, and suppose that detailed description is abbreviate | omitted.

  When the failure determination device 1 is configured to detect the voltage using the total voltage sensor 16 as in the first and second embodiments described above, the P-side quick charge contactor 14p and the N-side when the vehicle is stopped When both the quick charge contactors 14n are turned off by the BMU 31, when the voltage is detected by the total voltage sensor 16, the BMU 31 performs control to turn off both the P-side main contactor 11p and the N-side main contactor 11n as fail-safe. It is possible to do it.

  On the other hand, since the total voltage sensor 16 is used to determine the risk of electric shock to the worker, when the P-side main contactor 11p and the N-side main contactor 11n are turned off, the P-side main contactor 11p and the N-side main contactor are thereafter turned off. 11n cannot be turned ON and the vehicle cannot be restarted. How to determine whether to restart in order to solve such a problem will be described below.

  FIG. 9 is a flowchart illustrating an example of the restart determination process executed by the BMU 31. As a premise of the following processing, both the P-side main contactor 11p and the N-side main contactor 11n are in an OFF state, and similarly, both the P-side quick charge contactor 14p and the N-side quick charge contactor 14n are OFF. Is in a state.

  As shown in FIG. 9, the BMU 31 starts a leakage detection process (ST501). As a premise, both the forced circuit circuits Cp and Cn are in the OFF state, and the leakage detection circuit 17 operates normally.

  First, the BMU 31 controls the P-side main contactor 11p to turn on the P-side main contactor 11p (ST502).

  Next, the BMU 31 outputs a forced leakage drive signal Sp to the forced leakage circuit Cp, causing the forced leakage circuit Cp to be forced to leak (ST503).

  Next, based on the leakage detection signal received from leakage detection circuit 17, BMU 31 determines whether or not leakage has been detected, that is, whether or not OFF has been received as the leakage detection signal (ST504).

  When it is determined that leakage has been detected (ST504: YES), the BMU 31 confirms the welding of the P-side quick charge contactor 14p (ST505).

  When it is determined that the leakage detection is not performed (ST504: NO), the BMU 31 confirms non-welding of the P-side quick charge contactor 14p (ST506).

  When the process of step ST505 or ST506 is completed, the BMU 31 stops the forced leakage drive signal Sp output to the forced leakage circuit Cp and stops the forced leakage of the forced leakage circuit Cp (ST507).

  Next, the BMU 31 controls the P-side main contactor 11p and turns off the P-side main contactor 11p (ST508).

  The BMU 31 can execute the welding determination of the P-side quick charge contactor 14p by the processing of the above-described steps ST502 to ST508.

  Next, the BMU 31 controls the N-side main contactor 11n to turn on the N-side main contactor 11n (ST509).

  Next, the BMU 31 outputs a forced leakage drive signal Sn to the forced leakage circuit Cn, causing the forced leakage circuit Cn to be forced to leak (ST510).

  Next, the BMU 31 determines whether or not leakage has been detected based on the leakage detection signal received from the leakage detection circuit 17 (ST511).

  When it is determined that leakage has been detected (ST511: YES), the BMU 31 confirms the welding of the N-side quick charge contactor 14n (ST512).

  When it is determined that the leakage detection is not performed (ST511: NO), the BMU 31 confirms non-welding of the P-side quick charge contactor 14n (ST513).

  When the process of step ST513 or ST514 is completed, the BMU 31 stops the output of the forced leakage drive signal Sn to the forced leakage circuit Cn and stops the forced leakage of the forced leakage circuit Cn (ST515).

  Next, the BMU 31 controls the N-side main contactor 11n and turns off the N-side main contactor 11n (ST516).

  The BMU 31 can execute the welding determination of the N-side quick charge contactor 11n by the processing of the above-described steps ST510 to ST516.

  Next, the BMU 31 executes a restart determination process (ST517). In the third embodiment, the BMU 31 determines restart as in the following (a) to (c). In the present embodiment, the restart is determined as shown in (a) to (c), but under what conditions the restart can be performed can be arbitrarily set.

  (A) When it can be confirmed that both the P-side quick charge contactor 14p and the N-side quick charge contactor 14n are not welded, that is, not welded together, the BMU 31 determines that restart is possible.

  (B) If it can be confirmed that the P-side quick charge contactor 14p and the N-side quick charge contactor 14n are welded together, the BMU 31 determines that the restart is impossible.

  (C) When it is confirmed that either one (one side) of the P-side quick charge contactor 14p or the N-side quick charge contactor 14n is welded, the BMU 31 can be restarted under certain conditions. judge. Here, the fixed condition is, for example, a case where it is confirmed that the forced leakage circuits Cp and Cn are normal.

  According to the failure determination device 1 of the third embodiment, when the restart condition (a) or (c) is satisfied, an electric shock risk occurs once, and the P-side main contactor 11p and the N-side main contactor 11n are turned off. Even in this case, the vehicle can be restarted, that is, the P-side main contactor 11p and the N-side main contactor 11n can be turned on, and the vehicle can be driven. Note that the timing at which the restart process is executed is based on a predetermined policy, but may be performed, for example, when a vehicle driver performs a predetermined operation.

  In the third embodiment, the welding determination of the quick charge contactor 14 is performed in the order of the P-side quick charge contactor 14p and the N-side quick charge contactor 14n. However, the N-side quick charge contactor 14n and the P-side quick charge are determined. The welding determination may be performed in the order of the contactor 14p, as in the first and second embodiments.

  Further, in each of the above embodiments, the present invention has been described by applying the present invention to the case of determining a failure at the time of rapid charging. However, the present invention is not limited to this, and the present invention is not a case of rapid charging (for normal charging). Case) is also applicable.

  The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, you may delete some components from all the components shown by embodiment mentioned above. Furthermore, you may combine the structure of different embodiment.

DESCRIPTION OF SYMBOLS 1 ... Failure determination apparatus, 11 ... Main contactor, 11p ... P side main contactor, 11n ... N side main contactor, 12 ... Power supply path, 12p ... P side power supply path, 12n ... N side power supply path, 13 ... High Voltage load, 14 ... Quick charge contactor, 14p ... P side quick charge contactor, 14n ... N side quick charge contactor, 15 ... Quick charge connector, 15p ... P side quick charge connector, 15n ... N side quick charge connector, 16 ... Total Voltage sensor, 17 ... Leakage detection circuit, 18 ... Connection point, 19 ... Signal generator, 20 ... Capacitor, 21 ... Filter, 22 ... Detection circuit, 31 ... BMU, Cp, Cn ... Forced leakage circuit, V ... Battery for driving

Claims (5)

Battery,
A first charging connector used for charging the battery;
A second charging connector used as a pair with the first charging connector for charging the battery;
A first main contactor provided between one end of the battery and the first charging connector;
A second main contactor provided between the other end of the battery and the second charging connector;
A first charging contactor provided between the first main contactor and the first charging connector;
A second charging contactor provided between the second main contactor and the second charging connector;
A voltage sensor for detecting a voltage between the first charging contactor and the first charging connector and between the second charging contactor and the second charging connector;
A leakage detection circuit that detects a leakage of a power supply circuit that supplies power from the battery; and
A first forced leakage circuit connected between the first charging contactor and the first charging connector and forcibly generating a leakage;
A second forced leakage circuit connected between the second charging contactor and the second charging connector and forcibly generating a leakage;
The first main contactor, the second main contactor, the first charging contactor, the second charging contactor, the leakage detection circuit, the first forced leakage circuit, and the second forced leakage circuit. A control unit that controls and receives a first signal indicating detection of leakage from the leakage detection circuit and a second signal indicating detection of voltage from the voltage sensor;
A failure determination apparatus comprising: The controller is
In a state where the first main contactor and the second main contactor are ON, after either the first forced leakage circuit or the second forced leakage circuit is turned ON, the second sensor contacts the second forced leakage circuit. First determination means for determining whether or not a signal of
When it is determined that the second signal is received by the first determination unit, a first validity evaluation unit that evaluates the validity of voltage detection of the voltage sensor;
Second determination means for determining whether or not the first signal is received from the leakage detection circuit when the first determination means determines that the second signal is not received;
When it is determined that the first signal is received by the second determination unit, a second validity evaluation unit that evaluates the validity of voltage non-detection of the voltage sensor;
The failure determination apparatus according to claim 1, comprising: The first validity evaluation means includes:
It is determined whether the first charging contactor is welded using the first forced leakage circuit, and whether the second charging contactor is welded using the second forced leakage circuit. Determine whether
When the first charging contactor and the second charging contactor are welded together, it is determined that the voltage sensor is normal,
When the first charging contactor and the second charging contactor are not welded together, it is determined that the voltage sensor is abnormal.
The failure determination device according to claim 2. The second validity evaluation means includes:
It is determined whether the first charging contactor is welded using the first forced leakage circuit, and whether the second charging contactor is welded using the second forced leakage circuit. Determine whether
When it is determined that the first charging contactor is welded, it is determined that the voltage sensor is abnormal when it is determined that the second charging contactor is welded, and the second charging contactor is not Determining that the voltage sensor is normal under certain conditions when it is welded;
The failure determination device according to claim 2. The second validity evaluation means includes:
It is determined whether the first charging contactor is welded using the first forced leakage circuit, and whether the second charging contactor is welded using the second forced leakage circuit. Determine whether
If it is determined that the first charging contactor is welded, the voltage sensor detects the voltage until the voltage sensor detects a voltage or until it is determined that the second charging contactor is welded. When the determination and the welding determination of the second charging contactor are repeated, ON is detected by the voltage sensor, and it is determined that the second charging contactor is welding, the voltage sensor is normal. judge,
The failure determination device according to claim 2.

Images