Vehicle, vehicle control device, and charging system

Abstract

The present invention discloses a vehicle, a vehicle control device, and a charging system. The vehicle includes: a first power line configured to connect an outlet and a power storage device via a power conversion device; a second power line configured to connect the outlet and the power storage device without the power conversion device; a first relay configured to switch between a first conductive state that conducts the second power line and a first disconnected state that disconnects the second power line; and a first control device. The first control device is configured to switch the first relay to the first disconnected state when the voltage that can be supplied from the external power supply is lower than the voltage range within which the power storage device can be charged.

Description

Technical Field

[0001] The present disclosure relates to a vehicle, a vehicle control device, and a charging system capable of charging an on-vehicle power storage device using an external power supply. Background Art

[0002] In some vehicles, such as electric vehicles, an external power source can be used to charge an onboard power storage device. Such vehicles may also be equipped with a power conversion device. A power conversion device is a converter, for example, that converts power received from an external power source into power used to charge the onboard power storage device. By using such a power conversion device to step up or down the voltage of the power from the external power source, the power storage device can be charged. Alternatively, the power storage device can be charged by directly supplying power from the external power source to the power storage device without using a power conversion device.

[0003] For example, International Publication No. 2008 / 041418 discloses a vehicle equipped with multiple power storage devices (batteries) and multiple boost converters. In this vehicle, at least one of the multiple power storage devices is charged using power from an external power supply and at least one of the multiple boost converters. Summary of the Invention

[0004] However, the voltage of power storage devices installed in vehicles is being increased. However, external power supplies are sometimes not compatible with charging high-voltage power storage devices. Therefore, there are cases where a power conversion device is installed on the vehicle. The power conversion device boosts the voltage from the external power supply when the voltage that can be supplied from the external power supply to the vehicle is insufficient. Thus, when the external power supply is compatible with the high-voltage power storage device, the power storage device can be charged by supplying power from the external power supply to the power storage device without passing through the power conversion device. Alternatively, when the external power supply is not compatible with the high-voltage power storage device, the power from the external power supply is boosted using the power conversion device to a voltage that can charge the power storage device, thereby supplying power to the power storage device. Such an operation is achieved, for example, by switching the power transmission path using a switching device such as a relay. However, when the relay is switched inappropriately, there are cases where an inrush current or the like occurs.

[0005] The present disclosure provides a vehicle, a vehicle control device, and a charging system capable of appropriately switching to a power transmission path corresponding to an outputtable voltage of an external power supply.

[0006] A vehicle according to one embodiment of the present disclosure includes: an inlet configured to be connected to an external power source outside the vehicle; a power conversion device configured to be connected to the inlet; a power storage device configured to be charged using power supplied via the inlet; a first power line configured to connect the inlet and the power storage device via the power conversion device; a second power line configured to connect the inlet and the power storage device without the power conversion device; a first relay configured to switch between a first conductive state that conducts the second power line and a first disconnected state that disconnects the second power line; and a first control device configured to control the first relay. The first control device is configured to switch the first relay to the first disconnected state when a voltage that can be supplied from the external power source is lower than a voltage range within which the power storage device can be charged.

[0007] Thus, when the voltage that can be supplied from the external power supply falls below the voltage range within which the power storage device can be charged, the first relay enters the first disconnected state. Hereinafter, the voltage range within which the power storage device can be charged will be referred to simply as the "voltage range." This suppresses current flow from the power storage device to the external power supply. Consequently, it is possible to appropriately switch to a power transmission path that corresponds to the external power supply's output voltage.

[0008] In one embodiment, the vehicle may further include a second control device that is different from the first control device. The second control device may be configured to obtain information regarding a voltage that can be supplied from an external power supply, and, when the voltage that can be supplied from the external power supply included in the obtained information is lower than a voltage range, place the first relay in the first disconnected state regardless of a command generated by the first control device for the first relay.

[0009] Thus, even when the first control device cannot generate a normal command signal, the first relay can be placed in the first disconnection state.

[0010] Furthermore, in one embodiment, the vehicle may further include a second relay configured to switch between a second conductive state for conducting the first power line and a second disconnected state for disconnecting the first power line. The first control device may also be configured to, when the voltage that can be supplied from the external power supply is within the voltage range, place the first relay in the first conductive state and place the second relay in the second disconnected state.

[0011] Thus, when the voltage that can be supplied from the external power supply is within the voltage range, the first relay is in the first on state and the second relay is in the second off state. Therefore, the power supplied to the outlet directly without passing through the power conversion device can be supplied to the power storage device to charge the power storage device.

[0012] Furthermore, in one embodiment, the vehicle may further include a detection device for detecting the voltage at the outlet. The second control device is configured to, when the voltage that can be supplied from the external power supply is lower than the voltage range and the voltage at the outlet is higher than a threshold value, place the first relay in the first disconnected state and place the second relay in the second disconnected state, regardless of commands generated by the first control device for the first relay and the second relay.

[0013] Thus, when the voltage that can be supplied from the external power supply is lower than the voltage range and the voltage at the outlet is higher than the threshold, regardless of the commands generated by the first control device for the first and second relays, the first relay enters the first disconnection state and the second relay enters the second disconnection state. This can suppress current flow from the vehicle to the external power supply.

[0014] Another embodiment of the present disclosure relates to a vehicle control device mounted on a vehicle. The vehicle includes: an inlet configured to be connected to an external power source outside the vehicle; a power conversion device configured to be connected to the inlet; a power storage device configured to be charged using power supplied via the inlet; a first power line configured to connect the inlet and the power storage device via the power conversion device; a second power line configured to connect the inlet and the power storage device without the power conversion device; and a first relay configured to switch between a first conductive state that conducts the second power line and a first disconnected state that disconnects the second power line. The vehicle control device includes: an acquisition unit configured to acquire a voltage that can be supplied from the external power source; and a control unit configured to control the first relay so that the first relay enters the first disconnected state when the voltage that can be supplied from the external power source is lower than a voltage range within which the power storage device can be charged.

[0015] Another embodiment of the present disclosure relates to a charging system comprising a vehicle and an external power source external to the vehicle. The vehicle includes: an inlet configured to be connected to the external power source; a power conversion device configured to be connected to the inlet; a power storage device configured to be charged using power supplied via the inlet; a first power line configured to connect the inlet and the power storage device via the power conversion device; a second power line configured to connect the inlet and the power storage device without the power conversion device; and a first relay configured to switch between a first conductive state in which the second power line is conductive and a first disconnected state in which the second power line is disconnected. The external power source includes a control device configured to control the first relay. The control device is configured to place the first relay in a first disconnected state when the voltage supplied from the external power source is lower than a voltage range in which the power storage device can be charged.

[0016] According to the present disclosure, it is possible to provide a vehicle, a vehicle control device, and a charging system that appropriately switch to a power transmission path corresponding to an outputtable voltage of an external power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals represent like elements, and appended hereto:

[0018] Figure 1 This is a diagram schematically showing an example of the configuration of a charging system according to the present embodiment.

[0019] Figure 2 This is a diagram showing an example of a detailed configuration of the integrated charging ECU.

[0020] Figure 3 This is a flowchart showing an example of processing executed by the EV-ECU.

[0021] Figure 4 This is a diagram schematically showing an example of the structure of a vehicle according to a modification.

[0022] Figure 5 This is a flowchart showing an example of processing executed by the EV-ECU in the modification.

[0023] Figure 6 This is a diagram schematically showing an example of the structure of a vehicle according to another modified example.

[0024] Figure 7 This is a flowchart showing an example of processing executed by the microcomputer of the charging integrated ECU in another modification. DETAILED DESCRIPTION

[0025] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the drawings, identical or corresponding parts are denoted by identical reference numerals and their description will not be repeated.

[0026] Figure 1 1 is a diagram schematically showing an example of the configuration of the charging system 1 according to the present embodiment. Figure 1 Charging system 1 includes vehicle 2 and charging station 800. Vehicle 2 includes a battery pack 10, a buck-boost unit 40, an inlet 60, an EV-ECU (Electronic Control Unit) 100, an integrated charging ECU 300, a first load unit 500, and a second load unit 600. Vehicle 2 is, for example, an electric vehicle such as an electric vehicle or a hybrid vehicle.

[0027] The battery pack 10 includes a power storage device 12 , a system main relay (SMR) unit 20 , a battery ECU 200 , a battery voltage sensor 110 , and a battery current sensor 112 .

[0028] The EV-ECU 100 includes a processor such as a CPU (Central Processing Unit), memory such as ROM (Read Only Memory) and RAM (Random Access Memory), and input / output ports (not shown) for inputting and outputting various signals. The EV-ECU 100 manages the operating status of onboard electrical devices such as the SMR unit 20 based on signals from various sensors and programs stored in the memory. For example, the EV-ECU 100 outputs a permission / disapproval signal DCEN1 to the integrated charging ECU 300. The permission / disapproval signal DCEN1 indicates whether the operation of the first relay 52 is permitted or not in response to the first command generated by the integrated charging ECU 300. Furthermore, the EV-ECU 100 outputs a permission / disapproval signal DCEN2 to the integrated charging ECU 300. Permission / disapproval signal DCEN2 indicates permission / disapproval of the operation of second relay 54 and third relay 56 in response to the second and third commands generated by integrated charging ECU 300 for second relay 54 and third relay 56 .

[0029] The power storage device 12 is a rechargeable DC power source, configured to include, for example, a secondary battery such as a nickel-metal hydride battery or a lithium-ion battery having a liquid or solid electrolyte. A capacitor such as an electric double-layer capacitor can also be used as the power storage device 12. The power storage device 12 supplies power to the electrical equipment included in the first load unit 500. Furthermore, the power storage device 12 can be charged by power supplied from the buck-boost unit 40 or the first load unit 500. The power storage device 12 is configured, for example, as a battery pack composed of a plurality of battery cells. In this embodiment, the power storage device 12 includes, for example, a power storage device having a voltage greater than 500V.

[0030] The SMR unit 20 is electrically connected between the power storage device 12, the buck-boost unit 40, and the first load unit 500. The EV-ECU 100 issues a command to close / open the SMR unit 20. The SMR unit 20 includes, for example, a first SMR 22, a second SMR 24, a third SMR 26, and a precharge resistor 28. The command to close / open the SMR unit 20 includes a command to close / open the first SMR 22, a command to close / open the second SMR 24, and a command to close / open the third SMR 26.

[0031] The first SMR 22 is provided on the first positive line PL1. The first positive line PL1 includes a power line connecting the positive terminal of the socket 60 and the positive terminal of the power storage device 12. The second SMR 24 is provided on the first negative line NL1. The first negative line NL1 includes a power line connecting the negative terminal of the socket 60 and the negative terminal of the power storage device 12. The third SMR 26 is provided on the second negative line NL2. The second negative line NL2 is connected in parallel with the second SMR 24 provided on the first negative line NL1. The precharge resistor 28 is connected in series with the third SMR 26 on the second negative line NL2.

[0032] Battery ECU 200 includes a processor such as a CPU, memory such as ROM and RAM, and input / output ports (not shown) for inputting and outputting various signals. Battery ECU 200 manages the state of charge of power storage device 12 based on signals received from battery voltage sensor 110 and battery current sensor 112 and programs stored in memory.

[0033] Battery voltage sensor 110 detects battery voltage VB of power storage device 12 and transmits a signal indicating the detected battery voltage VB to battery ECU 200. Battery voltage sensor 110 is provided, for example, between first positive line PL1 and first negative line NL1, in parallel with power storage device 12. Battery voltage sensor 110 detects the voltage between first positive line PL1 and first negative line NL1 as battery voltage VB.

[0034] Battery current sensor 112 detects battery current IB flowing through power storage device 12 and transmits a signal indicating the detected battery current IB to battery ECU 200. Battery current sensor 112 is connected in series with second SMR 24 and detects the current flowing through power storage device 12 as battery current IB.

[0035] Battery ECU 200 calculates the SOC (State of Charge) of power storage device 12 using battery current IB and battery voltage VB. Various methods can be used to calculate SOC, such as those based on current value accumulation (coulomb counting) or estimation based on open circuit voltage (OCV). Battery ECU 200 transmits information regarding the calculated SOC to EV-ECU 100 and integrated charging ECU 300.

[0036] The first load unit 500 includes electrical equipment that operates at a predetermined first voltage (e.g., a voltage greater than 500V). The first load unit 500 includes, for example, a power control unit (PCU) and a motor generator (MG) (neither shown). The PCU converts power between the battery pack 10 and the MG. For example, the PCU includes an inverter that drives the MG using power supplied from the battery pack 10, and a converter (neither shown) that adjusts the level of the DC voltage supplied to the inverter.

[0037] The MG is driven by the inverter included in the PCU, for example, when the vehicle 2 is traveling. The power of the MG is transmitted to the drive wheels.

[0038] An inlet 60 is provided on the exterior of the vehicle 2. The buck-boost unit 40 is connected to the inlet 60. The buck-boost unit 40, for example, boosts or lowers the voltage of the power supplied to the inlet 60 and supplies the power to the first load unit 500 and the second load unit 600.

[0039] The socket 60 has a shape that can be connected to the connector 802 of the charging station 800 as an external power source. When the connector 802 is installed in the socket 60, the contacts built into the socket 60 and the contacts built into the connector 802 come into contact, and the socket 60 and the connector 802 become conductive. The connector 802 is connected to the charging station 800 via a cable or the like. Figure 1 , a state in which the connector 802 is mounted to the socket 60 is shown as an example.

[0040] Charging station 800 is, for example, a charging station capable of charging with an upper limit value of the charging voltage being 500 V or less.

[0041] The step-up / down voltage unit 40 includes a step-up / down voltage converter 42 , a charging relay unit 50 , a first voltage sensor 150 , a second voltage sensor 152 , a third voltage sensor 154 , and a step-up / down voltage ECU 400 .

[0042] The buck-boost converter 42 boosts the power supplied from the charging station 800 in response to a control signal from the buck-boost ECU 400, and supplies the boosted power to the battery pack 10 and the first load unit 500. A second load unit 600 is connected between the buck-boost converter 42 and the charging relay unit 50 to a power line branching from the first positive line PL1 and the first negative line NL1. The power supplied from the charging station 800 can be directly supplied to the second load unit 600, for example, via the inlet 60 and the charging relay unit 50. The second load unit 600 includes, for example, electrical equipment (e.g., a PCU, MG, etc.) that operates at a predetermined second voltage (e.g., a voltage of 500V or less).

[0043] The buck-boost ECU 400 includes a processor such as a CPU, memory such as ROM and RAM, and input / output ports (not shown) for inputting and outputting various signals. The buck-boost ECU 400 controls the buck-boost converter 42 based on signals received from the first and second voltage sensors 150 and 152 and a program stored in the memory.

[0044] The first voltage sensor 150 detects the voltage VL input to the boost-buck converter 42 (i.e., the voltage between the first positive line PL1 and the first negative line NL1 between the charging relay unit 50 and the boost-buck converter 42), and sends a signal indicating the detected voltage VL to the boost-buck ECU 400.

[0045] Second voltage sensor 152 detects voltage VH output from boost / buck converter 42 (i.e., voltage between first positive line PL1 and first negative line NL1 between boost / buck converter 42 and battery pack 10 ), and transmits a signal indicating detected voltage VH to boost / buck ECU 400 .

[0046] The charging relay unit 50 is electrically connected between the inlet 60 and the step-up / down converter 42. The charging integrated ECU 300 issues a command to close / open the charging relay unit 50. The charging relay unit 50 includes a first relay 52, a second relay 54, and a third relay 56.

[0047] First relay 52 is provided on second positive line PL2. One end of second positive line PL2 is connected to a position on first positive line PL1 between socket 60 and second relay 54 (described later). The other end of second positive line PL2 is connected to a position on first positive line PL1 between buck-boost converter 42 and battery pack 10. Second relay 54 is provided on first positive line PL1 between socket 60 and buck-boost converter 42. Third relay 56 is provided on first negative line NL1 between socket 60 and buck-boost converter 42.

[0048] The first relay 52, the second relay 54, and the third relay 56 are each operated in response to a control signal from the integrated charging ECU 300. Specifically, the on / off command for the charging relay unit 50 includes a on / off command for the first relay 52, a on / off command for the second relay 54, and a on / off command for the third relay 56.

[0049] Integrated charging ECU 300 includes a microcomputer comprising a processor such as a CPU, memory such as ROM and RAM, and input / output ports for inputting and outputting various signals; and a plurality of logic circuits for outputting drive signals for first relay 52, second relay 54, and third relay 56, using signals output from the microcomputer and signals input from EV-ECU 100. The microcomputer and logic circuits will be described later.

[0050] When the connector 802 is installed on the socket 60, the charging integrated ECU 300 controls at least any one of the first relay 52, the second relay 54 and the third relay 56 based on information indicating whether the connector 802 is installed on the socket 60, information related to the power supplied from the charging station 800 obtained from the charging station 800, a signal received from the third voltage sensor 154 and a program stored in the memory.

[0051] Third voltage sensor 154 detects voltage VDC between a connection point between first positive line PL1 and one end of second positive line PL2 and first negative line NL1 . Third voltage sensor 154 transmits a signal indicating detected voltage VDC to integrated charging ECU 300 .

[0052] For example, a detection circuit or a detection sensor (not shown) is provided in inlet 60 to detect whether connector 802 is installed. When connector 802 is installed in inlet 60, the detection circuit or the detection sensor outputs a signal indicating installation to integrated charging ECU 300. Integrated charging ECU 300 receives this signal as information indicating whether connector 802 is installed in inlet 60 and determines that connector 802 is installed in inlet 60.

[0053] Furthermore, integrated charging ECU 300 controls at least one of first relay 52, second relay 54, and third relay 56 using information regarding the power supplied from charging station 800. Integrated charging ECU 300 may obtain information regarding the power supplied from charging station 800 through, for example, wireless communication with charging station 800, or through wired communication using a power line or communication line.

[0054] The voltage of the power storage device 12 mounted on the vehicle 2, which has the above-described structure, is being increasingly increased. However, there are cases where the charging station 800 is not compatible with charging the high-voltage power storage device. Therefore, the vehicle 2 is provided with a step-up / down converter 42 as described above. If the charging station 800 is compatible with the high-voltage power storage device, the power storage device 12 can be charged by supplying power from the charging station 800 without passing through the step-up / down converter 42. Alternatively, if the charging station 800 is not compatible with the high-voltage power storage device, the power storage device 12 can be charged by supplying power that has been boosted using the step-up / down converter 42 to a voltage capable of charging the power storage device 12. This operation is achieved by switching the power transmission path using the above-mentioned charging relay unit 50. However, if the relay is switched inappropriately, an inrush current may occur.

[0055] Therefore, in the present embodiment, when the voltage supplied from charging station 800 is lower than the voltage range capable of charging power storage device 12 , charging integrated ECU 300 opens first relay 52 to electrically disconnect second positive line PL2 (first disconnection state).

[0056] This can suppress the flow of current from power storage device 12 to charging station 800 . Therefore, it is possible to appropriately switch to a power transmission path corresponding to the outputtable voltage of charging station 800 .

[0057] Furthermore, when the voltage that can be supplied from charging station 800 included in the information related to the voltage that can be supplied from charging station 800 is lower than the voltage range, EV-ECU 100 puts first relay 52 into the disconnected state (first disconnected state) regardless of the instruction to first relay 52 generated by integrated charging ECU 300.

[0058] Thus, even when charging integrated ECU 300 cannot generate a normal command signal, first relay 52 can be placed in the disconnected state.

[0059] Below, refer to Figure 2 , the detailed structure of the integrated charging ECU 300 will be described. Figure 2 1 is a diagram showing an example of a detailed configuration of integrated charging ECU 300 .

[0060] like Figure 2 As shown, the integrated charging ECU 300 includes a microcomputer 302 , a first AND (logical product) circuit 304 , a second AND circuit 306 , and a third AND circuit 308 .

[0061] Microcomputer 302 outputs a first command to first relay 52 to first AND circuit 304. Furthermore, microcomputer 302 outputs a second command to second relay 54 to second AND circuit 306. Furthermore, microcomputer 302 outputs a third command to third relay 56 to third AND circuit 308. Each of the first, second, and third commands includes, for example, outputting an OFF signal of "0" corresponding to a command to a disconnected state, and outputting an ON signal of "1" corresponding to a command to a conductive state.

[0062] Microcomputer 302 determines the state (either the on state or the off state) of each of first relay 52 , second relay 54 , and third relay 56 based on information on the voltage that can be supplied from charging station 800 .

[0063] The microcomputer 302 outputs a signal indicating an ON state (e.g., "1") as a command signal to the logic circuit corresponding to the relay set to the ON state (hereinafter referred to as the "conduction target relay"). The microcomputer 302 outputs a signal indicating an OFF state (e.g., "0") as a command signal to the logic circuit corresponding to the relay set to the OFF state (hereinafter referred to as the "non-conduction target relay").

[0064] For example, when the microcomputer 302 determines the first relay 52 as the conduction target relay and the second relay 54 and the third relay 56 as the non-conduction target relays, the microcomputer 302 outputs an ON signal to the first AND circuit 304 and outputs an OFF signal to the second AND circuit 306 and the third AND circuit 308 respectively.

[0065] For example, when the microcomputer 302 determines the first relay 52 as the non-conduction target relay and the second relay 54 and the third relay 56 as the conduction target relays, the microcomputer 302 outputs an OFF signal to the first AND circuit 304 and outputs an ON signal to the second AND circuit 306 and the third AND circuit 308 .

[0066] In addition to the first command, first AND circuit 304 receives a permission / disapproval signal DCEN1 from EV-ECU 100. Furthermore, in addition to the second command, second AND circuit 306 receives a permission / disapproval signal DCEN2 from EV-ECU 100. Furthermore, in addition to the third command, third AND circuit 308 receives a permission / disapproval signal DCEN2 from EV-ECU 100.

[0067] First AND circuit 304 outputs a drive signal DFR1 generated using a first command from microcomputer 302 and a permission / disapproval signal DCEN1 from EV-ECU 100 to first relay 52 .

[0068] Specifically, first AND circuit 304 outputs a signal corresponding to the logical product of the first command from microcomputer 302 and permission / failure signal DCEN1 from EV-ECU 100 to first relay 52 as drive signal DFR1 .

[0069] For example, when the permission / disapproval signal DCEN1 indicates permission (e.g., a signal corresponding to "1"), the first AND circuit 304 outputs the first command from the microcomputer 302 as the drive signal DFR1 to the first relay 52. ​​Specifically, when the microcomputer 302 outputs an ON signal as the first command, the ON signal is output from the first AND circuit 304 as the drive signal DFR1 to the first relay 52. ​​Furthermore, when the microcomputer 302 outputs an OFF signal as the first command, the OFF signal is output from the first AND circuit 304 as the drive signal DFR1 to the first relay 52.

[0070] On the other hand, when the permission signal DCEN1 is a signal indicating prohibition (e.g., a signal corresponding to "0"), the first AND circuit 304 outputs the OFF signal as the drive signal DFR1 to the first relay 52 regardless of whether the first instruction from the microcomputer 302 is an ON signal or an OFF signal.

[0071] Second AND circuit 306 outputs a drive signal DFR2 generated using the second command from microcomputer 302 and permission signal DCEN2 from EV-ECU 100 to second relay 54 .

[0072] Specifically, second AND circuit 306 outputs a signal corresponding to the logical product of the second command from microcomputer 302 and permission / failure signal DCEN2 from EV-ECU 100 to second relay 54 as drive signal DFR2 .

[0073] For example, when the permission / disapproval signal DCEN2 indicates permission (e.g., a signal corresponding to "1"), the second AND circuit 306 outputs the second command from the microcomputer 302 as the drive signal DFR2 to the second relay 54. Specifically, when the microcomputer 302 outputs an ON signal as the second command, the ON signal is output from the second AND circuit 306 to the second relay 54 as the drive signal DFR2.

[0074] On the other hand, when the permission signal DCEN2 of the second AND circuit 306 is a signal indicating prohibition (for example, a signal corresponding to "0"), the OFF signal is output to the second relay 54 as the drive signal DFR2 regardless of whether the second instruction from the microcomputer 302 is an ON signal or an OFF signal.

[0075] Third AND circuit 308 outputs a drive signal DFR3 generated using the third command from microcomputer 302 and permission / disapproval signal DCEN2 from EV-ECU 100 to third relay 56 .

[0076] Specifically, third AND circuit 308 outputs a signal corresponding to the logical product of the third command from microcomputer 302 and permission / failure signal DCEN2 from EV-ECU 100 to third relay 56 as drive signal DFR3 .

[0077] The operation of the third AND circuit 308 differs from the operation of the second AND circuit 306 as illustrated above in that the third instruction is input instead of the second instruction, and the drive signal DFR3 is output instead of the drive signal DFR2. The remaining structure and operation are the same as those of the second AND circuit 306, so their detailed description will not be repeated.

[0078] For example, when connector 802 is attached to inlet 60 , microcomputer 302 uses information on a voltage that can be supplied from charging station 800 to determine a relay to be conducted and a relay to be non-conducted.

[0079] For example, when the voltage that can be supplied from charging station 800 is within the voltage range capable of charging power storage device 12, microcomputer 302 determines first relay 52 and third relay 56 as the relays to be turned on, and determines second relay 54 as the relay to be turned off. Therefore, microcomputer 302 outputs an ON signal as a first command to first AND circuit 304 and a third command to third AND circuit 308, respectively, and outputs an OFF signal as a second command to second AND circuit 306.

[0080] On the other hand, if the voltage that can be supplied from charging station 800 is lower than the voltage range capable of charging power storage device 12, microcomputer 302 determines second relay 54 and third relay 56 as the relays to be turned on, and determines first relay 52 as the relay to be turned off. Therefore, microcomputer 302 outputs an ON signal as the second command to second AND circuit 306 and a third command to third AND circuit 308, respectively, and outputs an OFF signal as the first command to first AND circuit 304.

[0081] Furthermore, when the SOC of the power storage device 12 obtained from the battery ECU 200 is within the range corresponding to the fully charged state, the microcomputer 302 outputs OFF signals as the first, second, and third commands to the first, second, and third AND circuits 304, 306, and 308, respectively.

[0082] In vehicle 2 having the above configuration, in this embodiment, EV-ECU 100 outputs an OFF signal as permission signal DCEN1 when the voltage that can be supplied from charging station 800 is lower than the voltage range within which power storage device 12 can be charged, as described above.

[0083] Below, refer to Figure 3 , an example of processing executed by EV-ECU 100 is described. Figure 3 1 is a flowchart showing an example of processing executed by EV-ECU 100. In EV-ECU 100, a series of processing shown in this flowchart is repeatedly executed every predetermined control cycle.

[0084] In step (hereinafter referred to as S) 100, EV-ECU 100 determines whether the output voltage of charging station 800 is lower than a predetermined voltage. EV-ECU 100 uses, for example, information related to charging power obtained from charging station 800 to determine whether the output voltage of charging station 800 is lower than a predetermined voltage. The method for obtaining information related to charging power has been described above, so its detailed description will not be repeated. The predetermined voltage is, for example, a voltage of approximately 500V. If it is determined that the output voltage of charging station 800 is lower than the predetermined voltage ("Yes" in S100), the process transfers to S102.

[0085] In S102 , EV-ECU 100 outputs an OFF signal as permission / failure signal DCEN1 . The process then proceeds to S104 .

[0086] In S104 , EV-ECU 100 outputs an ON signal as permission / disapproval signal DCEN2 . The process then ends. If it is determined that the output voltage of charging station 800 is equal to or higher than a predetermined voltage (No in S100 ), the process proceeds to S106 .

[0087] In S106 , EV-ECU 100 outputs an ON signal as permission / disapproval signal DCEN1 , and then the process proceeds to S108 .

[0088] In S108 , EV-ECU 100 outputs an ON signal as permission / failure signal DCEN2 , and the process ends.

[0089] An example of the operation of EV-ECU 100 and integrated charging ECU 300 in the present embodiment based on the above-described structure and flowchart will be described.

[0090] For example, assume that connector 802 of charging station 800 is attached to inlet 60 of stopped vehicle 2. Also, assume that the upper limit of the output voltage of charging station 800 is lower than a predetermined voltage.

[0091] When connector 802 of charging station 800 is attached to inlet 60 , information on charging power is obtained from charging station 800 , and it is determined whether the output voltage of charging station 800 included in the obtained information is lower than a predetermined voltage ( S100 ).

[0092] When the output voltage of charging station 800 is lower than a predetermined voltage (YES in S100 ), an OFF signal is output to integrated charging ECU 300 as permission signal DCEN1 ( S102 ), and an ON signal is output to integrated charging ECU 300 as permission signal DCEN2 ( S104 ).

[0093] For example, when connector 802 is attached to inlet 60 and the output voltage of charging station 800 falls below a predetermined voltage, microcomputer 302 of integrated charging ECU 300 determines second relay 54 and third relay 56 as relays to be turned on and first relay 52 as relay to be turned off. Therefore, microcomputer 302 outputs an ON signal as a second command to second AND circuit 306 and a third command to third AND circuit 308, respectively, and outputs an OFF signal as a first command to first AND circuit 304.

[0094] When an ON signal is input from EV-ECU 100 as permission / disapproval signal DCEN2 to second and third AND circuits 306 and 308, ON signals are output from second and third AND circuits 306 and 308 as drive signals DFR2 and DFR3 to second and third relays 54 and 56, respectively. An OFF signal is output from first AND circuit 304 as drive signal DFR1 to first relay 52. ​​At this point, conduction of second positive line PL2 is interrupted, and conduction of first positive line PL1 is restored. Consequently, electric power from charging station 800 is supplied to power storage device 12 via step-up / step-down converter 42.

[0095] In addition, the OFF signal is input from the EV-ECU 100 to the first AND circuit 304 as the permission / disapproval signal DCEN1. Therefore, even if the ON signal is input as the first instruction to the first AND circuit 304 due to an abnormality in the microcomputer 302, the OFF signal is output from the first AND circuit 304 as the drive signal DFR1, thereby suppressing the first relay 52 from becoming the conductive state (the first conductive state).

[0096] When the output voltage of charging station 800 is equal to or higher than a predetermined voltage (No in S100), an ON signal is output to integrated charging ECU 300 as permission signal DCEN1 (S106), and an ON signal is output to integrated charging ECU 300 as permission signal DCEN2 (S108).

[0097] For example, when connector 802 is attached to inlet 60 and the output voltage of charging station 800 is equal to or higher than a predetermined voltage, microcomputer 302 of integrated charging ECU 300 determines first relay 52 and third relay 56 as relays to be turned on and second relay 54 as relay to be turned off. Therefore, microcomputer 302 outputs an ON signal as a first command to first AND circuit 304 and a third command to third AND circuit 308, respectively, and an OFF signal as a second command to second AND circuit 306.

[0098] When an ON signal is input from EV-ECU 100 to first AND circuit 304 as enable / disable signal DCEN1, and an ON signal is input from EV-ECU 100 to second and third AND circuits 306 and 308 as enable / disable signal DCEN2, ON signals are output from first and third AND circuits 304 and 308 as drive signals DFR1 and DFR3, respectively, to first relay 52 and third relay 56, and an OFF signal is output from second AND circuit 306 as drive signal DFR2 to second relay 54. At this time, second positive line PL2 becomes conductive, and conductivity is severed between the connection point of first positive line PL1 with one end of second positive line PL2 and the connection point with the other end of second positive line PL2. Consequently, electric power from charging station 800 is supplied to power storage device 12 without passing through step-up / step-down converter 42.

[0099] As described above, according to vehicle 2 of this embodiment, when the voltage that can be supplied from charging station 800, serving as an external power source, falls below the voltage range within which power storage device 12 can be charged, first relay 52 is disconnected, thereby suppressing current flow from power storage device 12 to charging station 800. In particular, since an OFF signal is input to first AND circuit 304 as permission / disability signal DCEN1, even if an ON signal is input to first AND circuit 304 as the first command due to an abnormality in microcomputer 302, first AND circuit 304 outputs an OFF signal, thereby disconnecting first relay 52. ​​Consequently, a vehicle, vehicle control device, and charging system are provided that appropriately switch to a power transmission path corresponding to the output voltage of the external power source.

[0100] The following describes a modified example. In the above embodiment, permission / disability signals DCEN1 and DCEN2 are set based on whether the output voltage of charging station 800 is lower than a predetermined voltage. For example, permission / disability signals DCEN1 and DCEN2 may be set based not only on the output voltage of charging station 800 but also on whether the voltage VDC detected by third voltage sensor 154 is greater than a threshold value.

[0101] Figure 4 This is a diagram schematically showing an example of the structure of a vehicle 2 according to a modification. Figure 4 The charging integrated ECU 300 shown is compared with Figure 1 The difference between the charging integrated ECU 300 shown in FIG. 1 and FIG. 2 is that the detection result of the third voltage sensor 154 is output to the EV-ECU 100 in addition to the charging integrated ECU 300. The other configurations are the same as those described below. Figure 1 The structure of the vehicle 2 shown is the same, so its detailed description will not be repeated.

[0102] like Figure 4 As shown, in this modification, the third voltage sensor 154 is configured to output a signal indicating the detected voltage VDC to each of the integrated charging ECU 300 and the EV-ECU 100. Alternatively, the integrated charging ECU 300 may output the voltage VDC obtained from the third voltage sensor 154 to the EV-ECU 100.

[0103] Below, refer to Figure 5 , an example of processing executed by EV-ECU 100 is described. Figure 5 1 is a flowchart showing an example of processing executed by EV-ECU 100 in a modified example. In EV-ECU 100, a series of processing shown in this flowchart is repeatedly executed every predetermined control cycle.

[0104] In S200, EV-ECU 100 determines whether the output voltage of charging station 800 is lower than a predetermined voltage. The determination method has been described above, so its detailed description will not be repeated. If it is determined that the output voltage of charging station 800 is lower than the predetermined voltage ("YES" in S200), the process proceeds to S202.

[0105] In S202, EV-ECU 100 determines whether voltage VDC detected by third voltage sensor 154 is greater than threshold value Va. Threshold value Va is, for example, the same as a predetermined voltage. However, it is not particularly limited to the same value as the predetermined voltage, provided that it is at least sufficient to determine that the voltage on the inlet 60 side is higher than the output voltage of charging station 800. If voltage VDC is determined to be greater than threshold value Va ("YES" in S202), processing proceeds to S204.

[0106] In S204 , EV-ECU 100 outputs an OFF signal as permission / disapproval signal DCEN1 , and then the process proceeds to S206 .

[0107] In S206 , EV-ECU 100 outputs an OFF signal as permission / disapproval signal DCEN2 , and the process ends thereafter.

[0108] In S208 , EV-ECU 100 outputs an ON signal as permission / disapproval signal DCEN1 , and then the process proceeds to S210 .

[0109] In S210 , EV-ECU 100 outputs an ON signal as permission / disapproval signal DCEN2 . The process then ends. If it is determined that voltage VDC is equal to or less than threshold value Va (NO in S202 ), the process proceeds to S212 .

[0110] In S212 , EV-ECU 100 outputs an OFF signal as permission / disapproval signal DCEN1 , and then the process proceeds to S214 .

[0111] In S214 , EV-ECU 100 outputs an ON signal as permission / failure signal DCEN2 , and the process ends thereafter.

[0112] An example of the operation of EV-ECU 100 and integrated charging ECU 300 in this modification based on the above-described structure and flowchart will be described.

[0113] For example, it is assumed that connector 802 of charging station 800 is connected to inlet 60 of stopped vehicle 2. Also, it is assumed that the output voltage of charging station 800 is lower than a predetermined voltage.

[0114] When connector 802 of charging station 800 is attached to inlet 60 , information on charging power is obtained from charging station 800 , and it is determined whether the output voltage of charging station 800 included in the obtained information is lower than a predetermined voltage ( S200 ).

[0115] When the output voltage of the charging station 800 is lower than the predetermined voltage ("Yes" in S200) and the voltage VDC is lower than the threshold value Va ("No" in S202), an OFF signal is output to the integrated charging ECU 300 as the permission / disapproval signal DCEN1 (S212), and an ON signal is output to the integrated charging ECU 300 as the permission / disapproval signal DCEN2 (S214).

[0116] Therefore, an OFF signal is output from first AND circuit 304 as drive signal DFR1 to first relay 52, an ON signal is output from second AND circuit 306 as drive signal DFR2 to second relay 54, and an ON signal is output from third AND circuit 308 as drive signal DFR3 to third relay 56. At this point, conduction of second positive line PL2 is interrupted, and conduction of first positive line PL1 is restored. Consequently, electric power from charging station 800 is supplied to power storage device 12 via step-up / step-down converter 42.

[0117] Furthermore, since an OFF signal is input from EV-ECU 100 to first AND circuit 304 as permission / disapproval signal DCEN1, even if an ON signal is input as the first command to first AND circuit 304 due to an abnormality in microcomputer 302, first AND circuit 304 outputs an OFF signal as drive signal DFR1. Thus, first relay 52 is prevented from being in the on state.

[0118] On the other hand, when the voltage VDC becomes higher than the threshold value Va due to an abnormality such as the first relay 52 being fixed in the ON state or the voltage of the storage device 12 being supplied to the socket 60 due to an abnormality of the step-up / down converter 42 ("Yes" in S202), an OFF signal is output as the permission / disapproval signal DCEN1, and an OFF signal is output as the permission / disapproval signal DCEN2.

[0119] As a result, even if an ON signal is output as the second and third commands, an OFF signal is output from first AND circuit 304 as drive signal DFR1 to first relay 52, an OFF signal is output from second AND circuit 306 as drive signal DFR2 to second relay 54, and an OFF signal is output from third AND circuit 308 as drive signal DFR3 to third relay 56. At this time, first positive line PL1, second positive line PL2, and first negative line NL1 are all disconnected. Therefore, current flow from power storage device 12 to charging station 800 can be suppressed.

[0120] Furthermore, in the above embodiment, a configuration in which one relay is provided in the second positive electrode line PL2 has been described as an example. However, two relays may be provided in the second positive electrode line PL2.

[0121] Figure 6 This is a diagram schematically showing an example of the structure of a vehicle 2 according to another modified example. Figure 6 The vehicle 2 shown is compared to Figure 1 The difference between the vehicle 2 shown is that a fourth relay 58 is provided for the second positive line PL2 in addition to the first relay 52. ​​The other configurations are the same as those of the vehicle 2 except for the following. Figure 1 The structure of the vehicle 2 shown is the same, so its detailed description will not be repeated.

[0122] like Figure 6 As shown, in this modified example, a first relay 52 and a fourth relay 58 are provided in series on the second positive line PL2. Furthermore, the integrated charging ECU 300 may also be configured such that, for example, the first AND circuit 306 outputs a drive signal DFR1 to the first relay 52, and the first AND circuit 306 outputs a drive signal DFR4 to the fourth relay 58. Alternatively, the integrated charging ECU 300 may further include a fourth AND circuit (not shown) that outputs a logical product of DCEN1 and the first command from the microcomputer 302, and the fourth AND circuit outputs the drive signal DFR4 to the fourth relay 58.

[0123] Thus, even if an ON signal is unintentionally output as the first command due to an abnormality in microcomputer 302 as described above, the permission / disappointment signal DCEN1 is an OFF signal, thereby maintaining the disconnected state of first relay 52 and fourth relay 58. Furthermore, even if either first relay 52 or fourth relay 58 is fixed in the ON state, the relay that is not fixed in the ON state can be used to disconnect the conduction of second positive line PL2.

[0124] Furthermore, for example, after charging is completed, the fixed state of at least any one relay can be detected by switching the on state (the first on state, the second on state, the third on state, and the fourth on state) and the off state (the first off state, the second off state, the third off state, and the fourth off state) of the first relay 52, the second relay 54, the third relay 56, and the fourth relay 58.

[0125] Figure 7 This flowchart illustrates an example of processing executed by microcomputer 302 of integrated charging ECU 300 in another modified embodiment. When execution conditions are met, such as after charging is completed, microcomputer 302 executes the series of processing shown in this flowchart. For ease of explanation, EV-ECU 100 outputs ON signals as enable / disable signals DCEN1 and DCEN2.

[0126] In S300, microcomputer 302 sets first relay 52, second relay 54, third relay 56, and fourth relay 58 to the initial state. Specifically, microcomputer 302 outputs ON signals as the first, third, and fourth commands, and outputs an OFF signal as the second command.

[0127] In S302, the microcomputer 302 sets the third relay 56 to the OFF state. That is, the microcomputer 302 outputs an OFF signal as the third command.

[0128] In S304, microcomputer 302 determines whether voltage VDC is less than predetermined value A. Predetermined value A is, for example, a predetermined value lower than the voltage of power storage device 12. If voltage VDC is determined to be less than predetermined value A (YES in S304), the process proceeds to S306.

[0129] In S306, microcomputer 302 sets first relay 52 to the OFF state. Specifically, microcomputer 302 outputs an OFF signal as the first command. The process then moves to S310. If voltage VDC is determined to be not less than predetermined value A ("No" in S304), the process moves to S308.

[0130] In S308, microcomputer 302 determines that third relay 56 is stuck in the ON state. Microcomputer 302 sets a failure determination flag indicating that third relay 56 is stuck in the ON state to the ON state, for example. Thereafter, the process proceeds to S306.

[0131] In S310, the microcomputer 302 turns on the third relay 56. Thereafter, the process proceeds to S312.

[0132] In S312, microcomputer 302 determines whether voltage VDC is less than predetermined value B. Predetermined value B is, for example, a predetermined value lower than the voltage of power storage device 12, and may be the same as or different from predetermined value A. If voltage VDC is determined to be less than predetermined value B ("YES" in S312), the process proceeds to S314.

[0133] In S314, microcomputer 302 sets fourth relay 58 to the OFF state. Specifically, microcomputer 302 outputs an OFF signal as the fourth command. The process then moves to S318. If voltage VDC is determined to be not less than predetermined value B ("No" in S312), the process moves to S316.

[0134] In S316, the microcomputer 302 determines that the first relay 52 is stuck in the ON state. For example, the microcomputer 302 sets the failure determination flag indicating that the first relay 52 is stuck in the ON state to the ON state. Thereafter, the process shifts to S314.

[0135] In S318, the microcomputer 302 turns on the first relay 52. ​​Thereafter, the process proceeds to S320.

[0136] In S320, microcomputer 302 determines whether voltage VDC is less than predetermined value C. Predetermined value C is, for example, a predetermined value lower than the voltage of power storage device 12, and may be the same as at least one of predetermined value A and predetermined value B, or may be a value different from either predetermined value A or predetermined value B. If voltage VDC is determined to be less than predetermined value C ("YES" in S320), the process proceeds to S322.

[0137] In S322, microcomputer 302 sets third relay 56 to the OFF state. The process then proceeds to S326. If voltage VDC is determined to be not less than predetermined value C (No in S320), the process proceeds to S324.

[0138] In S324, microcomputer 302 determines that fourth relay 58 is stuck in the ON state. Microcomputer 302 sets a fault determination flag indicating that fourth relay 58 is stuck in the ON state to the ON state, for example. Thereafter, the process proceeds to S322.

[0139] In S326, the microcomputer 302 sets the first relay 52 to the OFF state. Thereafter, the process proceeds to S328.

[0140] In S328, microcomputer 302 determines whether voltage VDC is less than predetermined value D. Predetermined value D is, for example, a predetermined value lower than the voltage of power storage device 12, and may be the same as at least one of predetermined value A, predetermined value B, and predetermined value C, or may be a value different from any of predetermined value A, predetermined value B, and predetermined value C. If it is determined that voltage VDC is less than predetermined value D (YES in S328), the process proceeds to S330.

[0141] In S330, microcomputer 302 outputs the determination result. Microcomputer 302 may also output, as the determination result, information indicating the need for repair, information regarding the fault location based on the status of various fault determination flags, and the like to a display device. If voltage VDC is determined to be not less than predetermined value D ("No" in S328), processing proceeds to S332.

[0142] In S332, the microcomputer 302 determines that both the first relay 52 and the third relay 56 of the two poles are fixed in the ON state. Thereafter, the process proceeds to S330.

[0143] The operation of integrated charging ECU 300 in this modified example based on the above-described structure and flowchart will be described.

[0144] For example, consider the case where charging of power storage device 12 has been completed. In this case, after third relay 56 is set to the initial state (S300), third relay 56 is set to the OFF state (S302). At this time, if voltage VDC is not less than predetermined value A (No in S304), third relay 56 is determined to be fixed in the ON state (S308).

[0145] Thereafter, or if it is determined that voltage VDC is less than predetermined value A ("YES" in S304), first relay 52 is set to the OFF state (S306), and third relay 56 is set to the ON state (S310). At this time, if it is determined that voltage VDC is not less than predetermined value B ("NO" in S312), first relay 52 is determined to be fixed in the ON state (S316).

[0146] Thereafter, or when it is determined that voltage VDC is less than predetermined value B (YES in S312 ), fourth relay 58 is set to the OFF state ( S314 ), and first relay 52 is set to the ON state ( S318 ).

[0147] At this time, if voltage VDC is not less than predetermined value C (NO in S320 ), it is determined that fourth relay 58 is fixed in the ON state ( S324 ).

[0148] Thereafter, or when it is determined that voltage VDC is less than predetermined value C (YES in S320 ), third relay 56 is set to the OFF state ( S322 ), and first relay 52 is set to the OFF state ( S326 ).

[0149] At this time, if voltage VDC is not less than predetermined value D (NO in S328 ), it is determined that both first relay 52 and third relay 56 are fixed in the ON state ( S332 ).

[0150] Thereafter, or when voltage VDC is smaller than predetermined value D (YES in S328 ), a determination result is output ( S330 ).

[0151] This makes it possible to accurately determine whether each relay is fixed in the ON state.

[0152] Furthermore, in the above embodiment, the permission / failure signals DCEN1 and DCEN2 generated in the EV-ECU 100 are output to the integrated charging ECU 300. However, for example, the control device 804 ( Figure 1 ) generates permission / disapproval signals DCEN1 and DCEN2, and inputs the generated permission / disapproval signals DCEN1 and DCEN2 to integrated charging ECU 300. Furthermore, when the permission / disapproval signals DCEN1 and DCEN2 generated by EV-ECU 100 are output to integrated charging ECU 300, charging station 800 does not require control device 804 as an essential component.

[0153] Furthermore, all or part of the above-mentioned modifications may be appropriately combined and implemented.

[0154] The embodiments disclosed herein are to be construed in all respects as illustrative and not restrictive. The scope of the present disclosure is defined not by the above description but by the claims, and is intended to encompass all modifications within the meaning and scope equivalent to the claims.

Claims

1. A vehicle, characterized in that: include: a socket configured to be connected to an external power source outside the vehicle; a power conversion device configured to be connected to the socket; a power storage device configured to be charged using the power supplied via the socket; a first power line configured to connect the socket and the power storage device via the power conversion device; a second power line configured to connect the socket and the power storage device without passing through the power conversion device; a first relay configured to switch between a first conducting state for conducting the second power line and a first disconnecting state for disconnecting the second power line; a first control device configured to control the first relay; and a second control device different from the first control device, The first control device is configured to place the first relay in the first disconnected state when the voltage that can be supplied from the external power supply is lower than a voltage range in which the power storage device can be charged. The second control device is configured to obtain information related to the voltage that can be supplied from the external power supply, and when the voltage that can be supplied from the external power supply included in the obtained information is lower than the voltage range, regardless of the instruction generated by the first control device for the first relay, the first relay is placed in the first disconnection state.

2. The vehicle according to claim 1, characterized in that The system further includes a second relay configured to switch between a second conducting state for conducting the first power line and a second disconnecting state for disconnecting the first power line. The first control device is configured to place the first relay in the first on-state and place the second relay in the second off-state when the voltage that can be supplied from the external power supply is within the voltage range.

3. The vehicle according to claim 2, characterized in that Also includes a detection device for detecting the voltage at the socket, The first control device is configured to place the first relay in the first disconnected state and the second relay in the second disconnected state when the voltage that can be supplied from the external power supply is lower than the voltage range and the voltage at the outlet is higher than a threshold.

4. The vehicle according to claim 2, characterized in that Also includes a detection device for detecting the voltage at the socket, The second control device is configured to, when the voltage that can be supplied from the external power supply is lower than the voltage range and the voltage at the socket is higher than a threshold value, regardless of the instructions generated in the first control device for the first relay and the second relay, place the first relay in the first disconnected state and place the second relay in the second disconnected state.

5. A vehicle control device mounted on a vehicle, characterized in that: The vehicle has: a socket configured to be connected to an external power source outside the vehicle; a power conversion device configured to be connected to the socket; a power storage device configured to be charged using the power supplied via the socket; a first power line configured to connect the socket and the power storage device via the power conversion device; a second power line configured to connect the socket and the power storage device without intermediary of the power conversion device; and The first relay is configured to switch between a first conducting state for conducting the second power line and a first disconnecting state for disconnecting the second power line. Wherein, the vehicle control device includes: an acquisition unit configured to acquire a voltage that can be supplied from the external power supply; a first control unit configured to control the first relay so as to enter the first disconnected state when a voltage that can be supplied from the external power supply is lower than a voltage range in which the power storage device can be charged; and a second control unit different from the first control unit, configured to obtain information related to a voltage that can be supplied from the external power supply, and, when the voltage that can be supplied from the external power supply included in the obtained information is lower than the voltage range, control the first relay so that the first relay is placed in the first disconnected state, regardless of a command generated by the first control unit for the first relay.

6. A charging system, characterized in that: include: vehicle; as well as an external power source external to the vehicle, The vehicle comprises: a socket configured to be connected to the external power source; a power conversion device configured to be connected to the socket; a power storage device configured to be charged using the power supplied via the socket; a first power line configured to connect the socket and the power storage device via the power conversion device; a second power line configured to connect the socket and the power storage device without intermediary of the power conversion device; and The first relay is configured to switch between a first conducting state for conducting the second power line and a first disconnecting state for disconnecting the second power line. The external power supply includes a first control device configured to control the first relay and a second control device different from the first control device. The first control device is configured to place the first relay in the first disconnected state when the voltage supplied from the external power supply is lower than a voltage range in which the power storage device can be charged. The second control device is configured to obtain information related to the voltage that can be supplied from the external power supply, and when the voltage that can be supplied from the external power supply included in the obtained information is lower than the voltage range, regardless of the instruction generated by the first control device for the first relay, the first relay is placed in the first disconnection state.

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