阅读说明：本技术 充电管理系统 (charging management system ) 是由 森本亨 于 2019-04-25 设计创作，主要内容包括：本发明涉及充电管理系统,充电管理系统包括车辆、和包含连接器的外部充电设备。上述车辆包括第2电阻、电压调整电路以及电子控制单元。上述电子控制单元构成为控制上述电压调整电路。上述电子控制单元构成为在第1状态与第2状态的任一个状态的情况下,判定为产生了在接地用端子无法将车辆侧接地线与设备侧接地线连接的异常。(The present invention relates to a charging management system including a vehicle, and an external charging apparatus including a connector. The vehicle comprises a No. 2 resistor, a voltage adjusting circuit and an electronic control unit. The electronic control unit is configured to control the voltage adjustment circuit. The electronic control unit is configured to determine that an abnormality that the vehicle-side ground line and the equipment-side ground line cannot be connected to each other at the ground terminal has occurred in either of the 1 st state and the 2 nd state.)

1. A charge management system, comprising:

A vehicle; and

An external charging device including a connector including a power line to which a predetermined voltage is applied, a device-side ground line that grounds the external charging device, and a 1 st resistor connected to the power line and the device-side ground line,

The vehicle includes: an electrical storage device; an inlet configured to supply electric power from the external charging device to the power storage device in a state where the connector of the external charging device is connected; and a charge management device configured to manage a state of a predetermined charge that is performed in a state where the connector of the external charging apparatus is connected to the inlet, the predetermined charge being a charge of the power storage device by electric power from the external charging apparatus,

the inlet includes a grounding terminal, a 1 st terminal and a 2 nd terminal,

The grounding terminal connects the device-side ground to a vehicle-side ground that grounds a body of the vehicle in a state where the connector is connected, the 1 st terminal connects the vehicle-side ground to the power line in a state where the connector is connected, and the 2 nd terminal connects to the device-side ground in a state where the connector is connected,

the charging management device comprises a No. 2 resistor, a voltage adjusting circuit and an electronic control unit,

A 1 st end of the 2 nd resistor is connected to the 2 nd terminal, the voltage adjustment circuit is configured to adjust a voltage between the 2 nd end of the 2 nd resistor and the vehicle-side ground, the electronic control unit is configured to control the voltage adjustment circuit, the electronic control unit is configured to determine that an abnormality that the vehicle-side ground and the equipment-side ground cannot be connected to each other at the grounding terminal occurs in either of a 1 st state and a 2 nd state,

The 1 st state is a state in which the electronic control unit controls the voltage adjustment circuit so that the 2 nd terminal of the 2 nd resistor has a high impedance and a voltage difference obtained by subtracting a voltage of the vehicle-side ground from a voltage of the 2 nd terminal is a negative predetermined value,

The 2 nd state is a state in which the electronic control unit controls the voltage adjustment circuit so that the voltage between the 2 nd end of the 2 nd resistor and the vehicle-side ground becomes 0 and the voltage difference becomes a negative predetermined value.

2. The charge management system according to claim 1,

The charge management device includes a negative voltage detection circuit that outputs a detection signal when the voltage difference is the negative prescribed value,

The electronic control unit is configured to determine that the abnormality in which the vehicle-side ground and the equipment-side ground cannot be connected to each other at the ground terminal has occurred when the detection signal is input.

3. The charge management system according to claim 2,

The negative voltage detection circuit includes a diode having a cathode connected to the 2 nd terminal, and a dc power supply having an anode connected to an anode of the diode and a cathode connected to a ground line on the vehicle side.

Technical Field

the present invention relates to a charge management system, and more particularly, to a charge management system for a vehicle including an external charging device and a charge management device including a power storage device, an inlet (unlet).

background

As such a charge management system, a charge management system has been proposed which manages a state of external charging in which an electric storage device (battery) of a vehicle is charged with electric power from an external charging apparatus (AC charger) (for example, refer to japanese patent laid-open No. 2017 and 15635). In this device, the external charging device is provided with a disconnection detection circuit that detects disconnection of a charging device-side ground line that grounds the external charging device, thereby detecting disconnection of the charging device-side ground line by the external charging device.

However, in the above-described charge management system, when the vehicle-side ground that grounds the vehicle body is connected to the external charging apparatus-side ground, even if an abnormality occurs in which the vehicle-side ground cannot be connected to the external charging apparatus-side ground due to disconnection or the like, the abnormality cannot be detected in the vehicle. Therefore, it is not possible to cope with a case where it is necessary to detect an abnormality in connection between the vehicle-side ground line and the external charging equipment-side ground line in the vehicle due to specifications or the like.

Disclosure of Invention

The invention detects whether an abnormality occurs in connection between a vehicle-side ground wire and an external charging device-side ground wire.

In order to achieve the above-described main object, the charge management device of the present invention adopts the following configuration.

The invention provides a charging management system. The charging management system includes a vehicle and an external charging device. The external charging device includes a connector. The connector includes a power line, a device-side ground line, and a 1 st resistor. The power line is applied with a predetermined voltage. The device-side ground line grounds the external charging device. The 1 st resistor is connected to the power line and the device side ground. The vehicle includes an electric storage device, an inlet, and a charge management device. The inlet is configured to supply electric power from the external charging device to the power storage device in a state where the connector of the external charging device is connected. The charging management device is configured to manage a predetermined charging state performed in a state where the connector of the external charging device is connected to the inlet. The predetermined charging is charging the power storage device with electric power from the external charging device. The inlet includes a ground terminal, a 1 st terminal and a 2 nd terminal. The grounding terminal connects the device-side ground to a vehicle-side ground that grounds a body of the vehicle in a state where the connector is connected. The 1 st terminal connects the vehicle-side ground line to the power line in a state where the connector is connected. The 2 nd terminal is connected to the device-side ground in a state where the connector is connected. The charging management device comprises a No. 2 resistor, a voltage adjusting circuit and an electronic control unit. The 1 st end of the 2 nd resistor is connected to the 2 nd terminal. The voltage adjustment circuit is configured to adjust a voltage between the 2 nd terminal of the 2 nd resistor and the vehicle-side ground. The electronic control unit is configured to control the voltage adjustment circuit. The electronic control unit is configured to determine that an abnormality occurs in which the vehicle-side ground and the equipment-side ground cannot be connected to each other at the ground terminal in either of the 1 st state and the 2 nd state. The 1 st state is a state in which the electronic control unit controls the voltage adjustment circuit so that the 2 nd terminal of the 2 nd resistor has a high impedance and a voltage difference obtained by subtracting a voltage of the vehicle-side ground from a voltage of the 2 nd terminal is a negative predetermined value. The 2 nd state is a state in which the electronic control unit controls the voltage adjustment circuit so that the voltage between the 2 nd end of the 2 nd resistor and the vehicle-side ground becomes 0 and the voltage difference becomes a negative predetermined value.

According to the above configuration, it is possible to detect whether or not an abnormality in connection of the vehicle-side ground and the charging apparatus-side ground occurs in the vehicle.

In the charge management system, the charge management device may include a negative voltage detection circuit that outputs a detection signal when the voltage difference is the negative predetermined value. The electronic control unit may be configured to determine that an abnormality that the vehicle-side ground line and the equipment-side ground line cannot be connected to each other at the ground terminal has occurred when the detection signal is input. According to the above configuration, by providing the negative voltage detection circuit independently of the electronic control unit, it is possible to detect whether or not an abnormality in connection between the vehicle-side ground and the charging apparatus-side ground has occurred in the vehicle even when the electronic control unit cannot detect a voltage difference obtained by subtracting the voltage of the vehicle-side ground from the voltage of the 2 nd terminal.

In the charge management system, the negative voltage detection circuit may include a diode and a dc power supply. A cathode of the diode may be connected to the 2 nd terminal. The positive electrode of the dc power supply may be connected to the anode of the diode. The negative electrode of the dc power supply may be connected to the vehicle-side ground. According to the above configuration, when a voltage difference obtained by subtracting the voltage of the vehicle-side ground from the voltage of the 2 nd terminal is a positive value, the diode can suppress a current from flowing from the 2 nd terminal to the dc power supply.

Drawings

the above and still further features and advantages of the present invention will be apparent from the following detailed description of the embodiments with reference to the accompanying drawings, in which like elements are given like reference numerals.

Fig. 1 is an explanatory diagram for explaining how a vehicle equipped with a charge management device according to an embodiment of the present invention is charged with electric power from a charging station.

fig. 2 is a configuration diagram showing an example of a connection relationship between a vehicle and a charging station.

Fig. 3 is a flowchart showing an example of a determination processing routine executed by the charging ECU.

Fig. 4 is a time chart showing an example of a connection state of the charging station, a state of on/off of the power supply, a state of the voltage VR4 at the end of the resistor R4 on the PNP bipolar transistor BP1 side, a detection voltage AD1, a state of on/off of the transistor Tr, and a time change of the detection voltage AD2 when the connection between the grounding terminal PE and the vehicle-side grounding line PE2 is normal.

Fig. 5 is an explanatory diagram for explaining the flow of current in the power supply on process in the case where the connection between the ground terminal PE and the vehicle-side ground line PE2 is normal.

Fig. 6 is an explanatory diagram for explaining the flow of current in the power supply disconnection process in the case where the connection of the ground terminal PE and the vehicle-side ground line PE2 is normal.

Fig. 7 is a time chart showing an example of a connection state of the charging station, a state of on/off of the power supply, a state of on/off of the voltage VR4 at the end of the resistor R4 on the side of the PNP bipolar transistor BP1, the detection voltage AD1, a state of on/off of the transistor Tr, and a time change of the detection voltage AD2 when an abnormality such as disconnection occurs in the connection between the grounding terminal PE and the vehicle-side grounding line PE 2.

Fig. 8 is an explanatory diagram for explaining the flow of current in the power supply on process in the case where an abnormality such as disconnection occurs in the connection between ground terminal PE and vehicle-side ground line PE 2.

Fig. 9 is an explanatory diagram for explaining the flow of current in the power supply disconnection process in the case where an abnormality such as disconnection occurs in the connection between the ground terminal PE and the vehicle-side ground line PE 2.

Fig. 10 is a configuration diagram showing an example of a connection relationship between a vehicle and a charging station according to a modification.

fig. 11 is a configuration diagram showing an example of a connection relationship between a vehicle and a charging station according to a modification.

Fig. 12 is a configuration diagram showing an example of a connection relationship between a vehicle and a charging station according to a modification.

Detailed Description

Next, a mode for carrying out the present invention will be described with reference to examples.

Fig. 1 is an explanatory diagram for explaining how a vehicle 20 equipped with a charge management device as one embodiment of the present invention is charged with electric power from a charging station 10. Fig. 2 is a configuration diagram showing an example of a connection relationship between the vehicle 20 and the charging station 10. Vehicle 20 of the embodiment is configured as, for example, an electric vehicle or a hybrid vehicle, and includes, as power sources for traveling, a motor (not shown), battery 22, inlet 24, resistor R4, voltage adjustment circuit 26, negative voltage detection circuit 30, and charge ECU 34.

The battery 22 is configured as, for example, a lithium ion secondary battery or a nickel metal hydride secondary battery. The battery 22 exchanges electric power with a motor, not shown.

The inlet 24 is accommodated in an accommodating portion 22a which is a recess formed in the outer surface of the vehicle body. A cover 22b is rotatably attached to the housing portion 22a to cover the housing portion 22 a. The cover 22b prevents water, dust, and the like from entering the inlet 24. The inlet 24 is connected to the battery 22 through a charging cord 25. Therefore, when connector 16 of charging station 10, which is an external charging device, is connected to inlet 24, the high-voltage dc voltage from charging station 10 is directly input to quickly charge battery 22. A charging relay (hereinafter, referred to as "CHR") 27 is attached to the charging wire 25. The CHR27 is controlled on and off by the charging ECU 34. When the CHR27 is turned on, the battery 22 can be charged by the dc voltage from the charging station 10.

Here, the structure of the charging station 10 will be described. The charging station 10 includes a power conversion unit 12, a power source 14, a resistor R1, and a connector 16.

The power conversion unit 12 converts an ac voltage from the industrial power system into a dc voltage. Power line PL1 connected to the output terminal of power converter 12 is connected to charging cord 25 of vehicle 20 in a state where connector 16 is connected to inlet 24 of vehicle 20, and applies a dc voltage to charging cord 25.

The power supply 14 is connected to the power line PL2 via a resistor RPL, and is connected between the power line PL2 and a station-side ground line PE1 that grounds the entire charging station 10. Power supply 14 applies a dc voltage of voltage Vchr to power line PL 2. The voltage Vchr is set to a voltage (e.g., 11V, 12V, 13V, etc.) according to the specification of the charging station 10, for example.

The connector 16 incorporates resistors R1 and R2 and a switch SW 1. Resistor R1 is connected to power line PL2, and to station-side ground line PE1 via switch SW 1. One end of the resistor R2 is connected to the station-side ground line PE 1. The structure of the charging station 10 is described above.

The inlet 24 includes a grounding terminal PE, detection terminals CC1 and CC2, and a resistor R3. The grounding terminal PE is connected to a vehicle-side grounding line PE2 for grounding the vehicle body. Ground terminal PE connects station-side ground line PE1 to vehicle-side ground line PE2 in a state where connector 16 is connected to inlet 24. The detection terminal CC1 is connected to the vehicle-side ground PE2 via a resistor R3. Detection terminal CC1 is connected to power line PL2 in a state where connector 16 is connected to inlet 24. The detection terminal CC2 is connected to the charge ECU34 via a resistor R11. Detection terminal CC2 is connected to station-side ground line PE1 via resistor R2 in a state where connector 16 is connected to inlet 24.

One end of the resistor R4 is connected to the detection terminal CC 2.

The voltage regulator circuit 26 is connected to the other end of the resistor R4 and the vehicle-side ground PE2, and includes a power supply 28, a PNP bipolar transistor BP1, an NPN bipolar transistor BP2, and resistors R5 to R8. The positive electrode of the power supply 28 is connected to the emitter of the PNP bipolar transistor BP1, and the negative electrode thereof is connected to the vehicle-side ground PE 2. The power supply 28 applies a dc voltage of the voltage Vsup to the emitter of the PNP bipolar transistor BP 1. The base of the PNP bipolar transistor BP1 is connected to the emitter via a resistor R5 and to the collector of the NPN bipolar transistor BP2 via a resistor R6. The voltage Vsup is set to the same voltage (for example, 11V, 12V, 13V, or the like) as a voltage predetermined as an operation voltage of the charging ECU 34. The collector of the PNP bipolar transistor BP1 is connected to the other end of the resistor R4. The base of the NPN bipolar transistor BP2 is connected to a signal line Ls to which a control signal Sbp of the charging ECU is applied via a resistor R7. The emitter of the NPN bipolar transistor BP2 is connected to the vehicle-side ground line PE 2. Resistor R8 is connected to signal line Ls and vehicle-side ground line PE 2. In the voltage regulator circuit 26 configured as described above, when the control signal Sbp reaches a predetermined on voltage, the NPN bipolar transistor BP2 and the PNP bipolar transistor BP1 are turned on, and the voltage of the power supply 28 is applied to the other end of the resistor R4, and when the control signal Sbp reaches a predetermined off voltage, the NPN bipolar transistor BP2 and the PNP bipolar transistor BP1 are turned off, and the application of the voltage of the power supply 28 to the other end of the resistor R4 is stopped, so that the other end of the resistor R4 has a high impedance.

The negative voltage detection circuit 30 is connected between the detection terminal CC2 and the vehicle-side ground PE2, and includes an N-channel MOSFET (hereinafter referred to as a "transistor") Tr, a diode D, a power supply 32, and resistors R9 and R10. The transistor Tr has a gate connected to the vehicle-side ground PE2 and a source connected to the detection terminal CC 2. The cathode of the diode D is connected to the drain of the transistor Tr. The diode D suppresses a current from flowing from the detection terminal CC2 to the power supply 32. The positive electrode of the power supply 32 is connected to the anode of the diode D via resistors R9 and R10, and the negative electrode is connected to a vehicle-side ground PE 2. The power supply 32 applies a dc voltage of a voltage Vdet (for example, 4V, 5V, 6V, or the like) to one end of the resistor R9. The detection voltage AD2 at the connection point of the resistor R9 and the resistor R10 is input to the charging ECU 34. The negative voltage detection circuit 30 configured as described above turns off the transistor Tr when a voltage difference dV obtained by subtracting the voltage VCC2 at the detection terminal CC2 from the voltage (value 0) at the vehicle-side ground PE2 is lower than the threshold voltage Vth (positive value) of the transistor Tr. At this time, the detection voltage AD2 at the connection point between the resistor R9 and the resistor R10 becomes a voltage V2 slightly lower than the voltage Vdet. When the voltage difference dV is equal to or higher than the threshold voltage Vth, the transistor Tr is turned on. At this time, the detection voltage AD2 at the connection point between the resistor R9 and the resistor R10 is a voltage near the voltage VCC2 at the detection terminal CC 2.

The charging ECU34 is configured as a microprocessor including a CPU, not shown, and includes a ROM that stores processing programs, a RAM that temporarily stores data, an input/output port, a communication port, and the like, in addition to the CPU. The charge ECU34 receives, via an input port, a detection voltage AD1 input from a detection terminal CC2 via a resistor R11, a detection voltage AD2 as a voltage at a connection point between the resistor R9 and the resistor R10, and the like. A control signal to the CHR27, a control signal Sbp to the NPN bipolar transistor BP2, and the like are output from the charge ECU34 via an output port. When connector 16 is connected to inlet 24, charging ECU34 CAN communicate with a CAN circuit, not shown, of charging station 10 via the CAN circuit, not shown. The charging ECU34 transmits a charging start command instructing to start charging to the charging station 10, transmits the state of the battery 22, and transmits a charging stop command instructing to stop charging to the charging station 10 when the battery 22 is abnormal.

In the vehicle 20 of the embodiment configured as described above, when the connector 16 of the charging station 10 is connected to the inlet 24 of the vehicle 20, the CHR27 is turned on to transmit a charging start command to the charging station 10. Charging station 10 that has received the charging start command starts external charging in which battery 22 is charged via charging line 25 by applying a dc voltage to power line PL 1.

Next, the operation of the vehicle 20 of the embodiment configured as described above, particularly the operation when abnormality of the grounding terminal PE is determined, will be described. Fig. 3 is a flowchart showing an example of a determination processing routine executed by the charging ECU 34. The present routine is executed at every prescribed time (for example, at every 10msec) during parking of the vehicle 20. Here, the vehicle 20 is determined to be in the parking state when the shift range, not shown, is the parking range. During execution of the present routine, the switch SW1 built in the connector 16 of the charging station 10 is turned on.

When the present routine is executed, the CPU of the charging ECU34 executes a power-on process of applying the voltage Vsup of the power supply 28 to the resistor R4 (step S100). In the power-on process, the NPN bipolar transistor BP2 and the PNP bipolar transistor BP1 are turned on by using the control signal Sbp as an on voltage.

Next, the detection voltage AD1 is input (step S110), and it is determined whether or not the input detection voltage AD1 is the voltage V1 (step S120). Voltage V1 is a voltage that is input to charge ECU34 via resistor R11 when NPN bipolar transistor BP2 and PNP bipolar transistor BP1 are turned on in a state where connector 16 of charging station 10 and inlet 24 of vehicle 20 are not connected. When connector 16 of charging station 10 and inlet 24 of vehicle 20 are not connected, detected voltage AD1 is the same as voltage V1. Therefore, the process of step S120 is a process of determining whether or not the connector 16 of the charging station 10 and the inlet 24 of the vehicle 20 are not connected.

when detected voltage AD1 is voltage V1 at step S120, it is determined that connector 16 of charging stand 10 and inlet 24 of vehicle 20 are not connected (step S140), and the routine is ended.

When the detected voltage AD1 is not the voltage V1 in step S120, it is determined whether the detected voltage AD1 is within a prescribed range (step S130). The predetermined range is a range determined in advance as a voltage range that can be obtained by detecting voltage AD1 when connector 16 of charging station 10 is connected to inlet 24 of vehicle 20, and is, for example, a range of 3V or more and less than 9V. When connector 16 of charging station 10 is connected to inlet 24 of vehicle 20, detected voltage AD1 becomes a voltage lower than voltage V1 and higher than the voltage (value 0) of vehicle-side ground PE2, and is determined by voltage V1, the resistance value of each resistor on the current path, power supply 28, the manufacturing error of each resistor, and the like. The predetermined range is determined in consideration of the range of the voltage that can be obtained by the detection voltage AD 1.

When detected voltage AD1 is within the predetermined range in step S130, it is determined that connector 16 of charging stand 10 is being connected to inlet 24 of vehicle 20 (step S150).

Next, a power-off process of turning off the power supply 28 is executed (step S160). In the power supply disconnection process, the NPN bipolar transistor BP2 and the PNP bipolar transistor BP1 are turned off using the control signal Sbp as a disconnection voltage.

Next, the detection voltage AD2 is input (step S170), and it is determined whether or not the detection voltage AD2 is 0 (step S180). Here, the reason why it is determined whether or not the detection voltage AD2 has a value of 0 will be described.

Fig. 4 is a time chart showing an example of a connection state of charging stand 10, a state of on/off of power supply 28, a voltage VR4 at one end of resistor R4 on the side of PNP bipolar transistor BP1, detection voltage AD1, a state of on/off of transistor Tr, and a time change of detection voltage AD2 when the connection between ground terminal PE and vehicle-side ground line PE2 is normal. Fig. 5 is an explanatory diagram for explaining the flow of current in the power supply on process in the case where the connection between the ground terminal PE and the vehicle-side ground line PE2 is normal. Fig. 6 is an explanatory diagram for explaining the flow of current in the power supply disconnection process in the case where the connection of the ground terminal PE and the vehicle-side ground line PE2 is normal. The thick line arrows of fig. 5 and 6 show the flow of current. When the connection between ground terminal PE and vehicle-side ground line PE2 is normal, as shown in fig. 4 and 5, when the power supply on process is being executed (time t1 to time t2), detection voltage AD1 becomes a positive value, so that transistor Tr is turned off, detection voltage AD2 becomes voltage V2, and closed currents flow on the charging station 10 side and the vehicle 20 side, respectively. When the power supply disconnection process is executed (time t2 to t3), as shown in fig. 4 and 6, since the voltage VR4 has a value of 0 and the detection voltage AD1 has a value of 0, the transistor Tr continues to be turned off, the detection voltage AD2 maintains the voltage V2, and a closed current flows only on the charging station 10 side. In this way, when the power supply disconnection process is executed in a case where the connection of the ground terminal PE and the vehicle-side ground line PE2 is normal, the detection voltage AD2 is maintained at the voltage V2.

Fig. 7 is a time chart showing an example of a connection state of charging stand 10, a state of on/off of power supply 28, a state of voltage VR4 at one end of resistor R4 on the side of PNP bipolar transistor BP1, detection voltage AD1, a state of on/off of transistor Tr, and a time change of detection voltage AD2 when an abnormality such as disconnection occurs in the connection between ground terminal PE and vehicle-side ground line PE 2. Fig. 8 is an explanatory diagram for explaining the flow of current in the power supply on process in the case where an abnormality such as disconnection occurs in the connection between ground terminal PE and vehicle-side ground line PE 2. Fig. 9 is an explanatory diagram for explaining the flow of current in the power supply disconnection process in the case where an abnormality such as disconnection occurs in the connection between the ground terminal PE and the vehicle-side ground line PE 2. In fig. 8 and 9, thick line arrows show the flow of current. When an abnormality occurs in the connection between ground terminal PE and vehicle-side ground line PE2, as shown in fig. 7 and 8, when the power supply on process is executed (time t4 to t5), detection voltage AD1 becomes a positive value, so transistor Tr is turned off, detection voltage AD2 becomes voltage V2, and a part of the current on the charging station 10 side continuously flows to the vehicle 20 side. When the power-off process is executed (time t5 to time t6), as shown in fig. 7 and 9, the voltage VR4 is near the negative voltage V5, the detection voltage AD1 is the negative voltage V5, the transistor Tr is turned on, and the detection voltage AD2 is 0. In this way, when the power supply disconnection process is performed, detection voltage AD2 becomes voltage V2 when the connection of grounding terminal PE and vehicle-side ground PE2 is normal, and detection voltage AD2 becomes value 0 when abnormality occurs in the connection of grounding terminal PE and vehicle-side ground PE 2. Therefore, by determining whether or not detection voltage AD2 is equal to 0, it is possible to determine whether or not an abnormality has occurred in the connection between grounding terminal PE and vehicle-side ground line PE 2. For this reason, in step S180, it is determined whether or not the detection voltage AD2 is equal to 0.

If detected voltage AD2 is not 0 in step S180, it is determined that the connection between grounding terminal PE and vehicle-side ground PE2 is normal, and the routine is ended.

When detection voltage AD2 has reached a value of 0 in step S180, it is determined that an abnormality has occurred in the connection between grounding terminal PE and vehicle-side ground wire PE2 (step S190), and the routine is terminated. By this processing, it is possible to detect whether or not an abnormality has occurred in the connection between the ground terminal PE and the vehicle-side ground line PE2, that is, the connection between the vehicle-side ground line PE2 and the station-side ground line PE 1.

When detected voltage AD1 is out of the predetermined range in step S130, it is determined that some abnormality has occurred in charge ECU34 (step S200), and the routine is ended. This makes it possible to determine whether or not an abnormality has occurred in the connection between ground terminal PE and vehicle-side ground line PE2, and whether or not an abnormality has occurred in charge ECU 34.

As described above, charging station 10 incorporates, in connector 16, power line PL2 to which voltage Vchr is applied, station-side ground line PE1 that grounds charging station 10, and resistor R1 connected to power line PL2 and station-side ground line PE 1. Vehicle 20 mounted with the charge management device of the embodiment incorporates, in inlet 24, a grounding terminal PE for connecting vehicle-side ground line PE2, which grounds the vehicle body in the state where connector 16 is connected, to station-side ground line PE1, a detection terminal CC1 for connecting vehicle-side ground line PE2 to power line PL2 in the state where connector 16 is connected, and a detection terminal CC2 for connecting to station-side ground line PE1 via resistor R2 in the state where connector 16 is connected. Further, the charging ECU34, which includes a resistor R4 having one end connected to the detection terminal CC2, a voltage adjustment circuit 26 that adjusts the voltage between the other end of the resistor R4 and the vehicle-side ground PE2, and the charging ECU34 that controls the voltage adjustment circuit 26, determines that an abnormality occurs in which the vehicle-side ground PE2 and the station-side ground PE1 cannot be connected to the ground terminal PE when the detection voltage AD1 (a voltage obtained by subtracting the voltage of the vehicle-side ground PE2 from the voltage of the detection terminal CC 2) is a negative voltage V5 when the voltage adjustment circuit 26 is controlled so that the other end of the resistor R4 has a high impedance. This makes it possible to detect whether or not an abnormality has occurred in the connection between vehicle-side ground line PE2 and station-side ground line PE 1.

In vehicle 20 equipped with the charge management device according to the embodiment, negative voltage detection circuit 30 that outputs detection voltage AD2 having a value of 0 when detection voltage AD1 is a negative predetermined value is provided, and when detection voltage AD2 is a value of 0, it is determined that an abnormality occurs in which vehicle-side ground line PE2 and station-side ground line PE1 cannot be connected to each other at ground terminal PE, and thus it is possible to detect whether or not an abnormality occurs in connection between vehicle-side ground line PE2 and station-side ground line PE1 in vehicle 20 even when charging ECU34 cannot detect a voltage difference dV that is obtained by subtracting the voltage of vehicle-side ground line PE2 from voltage VCC2 at detection terminal CC 2.

Further, since the negative voltage detection circuit 30 includes the diode D having the cathode connected to the detection terminal CC2, and the power supply 32 having the anode connected to the anode of the diode D and the cathode connected to the vehicle-side ground PE2, it is possible to suppress a current from flowing from the detection terminal CC2 to the power supply 32.

The vehicle 20 equipped with the charge management device of the embodiment includes the negative voltage detection circuit 30, but may not include the negative voltage detection circuit 30 as exemplified in the vehicle 120 of the modification of fig. 10. In this case, in the charge ECU34, it is sufficient if it is determined that an abnormality occurs in the grounding terminal PE that the vehicle-side ground line PE2 and the station-side ground line PE1 cannot be connected to each other when the detection voltage AD1 is a negative voltage when the power supply disconnection process is executed.

Although the vehicle 20 mounted with the charge management device of the embodiment includes the voltage adjustment circuit 26, the vehicle may include a voltage adjustment circuit 226 instead of the voltage adjustment circuit 26 as illustrated in the vehicle 220 of the modification of fig. 11. The voltage adjustment circuit 226 includes a power supply 228 capable of adjusting an output voltage between the other end of the resistor R4 and the vehicle-side ground PE 2. The power supply 228 is controlled by the charging ECU 34. In this way, instead of the power-off processing in step S160, the voltage at the other end of the resistor R4 may be adjusted to a value of 0 by the power supply 228. This makes it possible to detect whether or not an abnormality has occurred in the connection between vehicle-side ground line PE2 and station-side ground line PE 1. As illustrated in the vehicle 320 according to the modification of fig. 12, the negative voltage detection circuit 30 in the configuration of the vehicle 220 may not be provided.

The charge management system including the vehicle 20 equipped with the charge management device of the embodiment and the charging station 10 includes the resistors RPL, R2, and R3, but may not include the resistors RPL, R2, and R3.

In the vehicle 20 mounted with the charge management device of the embodiment, the battery 22 is provided as the power storage device, but a capacitor may be provided instead of the battery 22.

The correspondence between the main components of the embodiments and the main components of the invention described in the section of the summary of the invention will be described. In the embodiment, battery 22 is an example of "power storage device", inlet 24 is an example of "inlet", charging station 10 is an example of "external charging equipment", connector 16 is an example of "connector", power line PL2 is an example of "power line", station-side ground line PE1 is an example of "equipment-side ground line", resistor R1 is an example of "1 st resistor", grounding terminal PE is an example of "grounding terminal", detection terminal CC1 is an example of "1 st terminal", detection terminal CC2 is an example of "2 nd terminal", resistor R4 is an example of "2 nd resistor", voltage adjustment circuit 26 is an example of "voltage adjustment circuit", and charging ECU34 is an example of "control device". The negative voltage detection circuit 30 is an example of a "negative voltage detection circuit". The diode D is an example of a "diode", and the power supply 28 is an example of a "dc power supply".

In addition, the correspondence relationship between the main components of the embodiment and the main components of the invention described in the summary of the invention is an example for specifically describing the mode for carrying out the invention described in the summary of the invention in the embodiment, and therefore, the invention components described in the summary of the invention are not limited. That is, the invention described in the summary of the invention should be explained based on the description in this column, and the embodiment is merely a specific example of the invention described in the summary of the invention.

While the embodiments for carrying out the present invention have been described above with reference to the examples, it is needless to say that the present invention is not limited to the examples and can be carried out in various ways within a range not departing from the gist of the present invention.

The present invention can be used in the manufacturing industry of charge management devices and the like.