Vehicle, vehicle control device and charging system

Abstract

To provide a vehicle, a vehicle control device, and a charging system that can appropriately switch to a power transmission path corresponding to an output possible voltage of an external power supply.SOLUTION: An EV-ECU executes processing including: S100 of determining whether or not an output possible voltage of a charging station is lower than a predetermined voltage; S102 of, when it is determined that the output possible voltage is lower than the predetermined voltage (YES in S100), outputting an OFF signal as a permission-prohibition signal DCEN1; S104 of outputting an ON signal as a permission-prohibition signal DCEN2; step S106 of, when it is determined that the output possible voltage is equal to or higher than the predetermined voltage (NO in S100), outputting an ON signal as the permission-prohibition signal DCEN1; and step S108 of outputting an ON signal as the permission-prohibition signal DCEN2.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to control of a vehicle in which an on-board power storage device can be charged using an external power source. [Background technology]

[0002] Vehicles such as electric vehicles that can charge an on-board power storage device using an external power source may be provided with a power conversion device such as a converter for converting power received from the external power source into power for charging the on-board power storage device. The power storage device can be charged by using such a power conversion device to step up or step down the power from the external power source, or 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 (Patent Document 1) discloses a technique for a vehicle equipped with multiple batteries and multiple boost converters, in which power from an external power source is used to charge at least one of multiple power storage devices mounted on the vehicle using at least one of the multiple boost converters. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2008 / 041418 Summary of the Invention [Problem to be solved by the invention]

[0005] Meanwhile, the voltage of the electric storage device mounted on the vehicle is becoming higher, but since the external power source does not necessarily support charging the high-voltage electric storage device, the vehicle may be equipped with a power conversion device that boosts the voltage from the external power source when the voltage that can be supplied from the external power source to the vehicle is insufficient. As a result, when the external power source supports the high-voltage electric storage device, the electric storage device can be charged by supplying power from the external power source to the electric storage device without passing through the power conversion device. Also, when the external power source does not support the high-voltage electric storage device, the electric storage device can be charged by boosting the voltage to a voltage that allows charging the electric storage device using the power conversion device and supplying the power to the electric storage device. Such an operation is realized, for example, by switching the transmission path of the electric power using a switching device such as a relay, but if the relay is switched inappropriately, an inrush current or the like may occur.

[0006] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to provide a vehicle, a vehicle control device, and a charging system that appropriately switches to a power transmission path that corresponds to the output voltage of an external power source. [Means for solving the problem]

[0007] A vehicle according to an aspect of the present disclosure includes an inlet connectable to an external power source outside the vehicle, a power conversion device connected to the inlet, a power storage device chargeable using power supplied via the inlet, a first power line connecting the inlet and the power storage device via the power conversion device, a second power line connecting the inlet and the power storage device without passing through the power conversion device, a first relay switchable between a conductive state that connects the second power line and a cut-off state that cuts off the continuity of the second power line, and a first control device that controls the first relay. When a voltage that can be supplied from the external power source is lower than a voltage range in which the power storage device can be charged, the first control device switches the first relay to the cut-off state.

[0008] In this way, when the voltage that can be supplied from the external power source is lower than the voltage range in which the power storage device can be charged, the first relay is brought into an interrupted state, thereby preventing a current from flowing from the power storage device to the external power source, and therefore, it is possible to appropriately switch to a power transmission path that corresponds to the output voltage of the external power source.

[0009] In one embodiment, the vehicle further includes a second control device different from the first control device. The second control device acquires information on a voltage that can be supplied from the external power source, and when the voltage that can be supplied from the external power source included in the acquired information is lower than a voltage range, the second control device switches the first relay to an off state regardless of a command for the first relay generated in the first control device.

[0010] In this way, even if the first control device cannot generate a normal command signal, the first relay can be brought into an interrupted state.

[0011] In yet another embodiment, the vehicle further includes a second relay switchable between a conductive state in which the first power line is conductive and a cut-off state in which the first power line is cut-off. When a voltage that can be supplied from the external power source is within a voltage range, the first control device sets the first relay to a conductive state and the second relay to a cut-off state.

[0012] In this manner, when the voltage that can be supplied from the external power source is within the voltage range, the first relay is in a conductive state and the second relay is in a cut-off state, so that the power supplied to the inlet directly, without passing through the power conversion device, can be supplied to the power storage device to charge the power storage device.

[0013] In yet another embodiment, the vehicle further includes a detection device for detecting a voltage at the inlet, and the second control device turns off the first relay and the second relay regardless of commands for the first relay and the second relay generated in the first control device when the voltage that can be externally supplied is lower than the voltage range and the voltage at the inlet is higher than a threshold value.

[0014] In this manner, when the voltage that can be supplied from outside is lower than the voltage range and the voltage at the inlet is higher than the threshold value, the first relay and the second relay are brought into an off state regardless of the command for the first relay and the second relay generated in the first control device, thereby preventing current from flowing from the vehicle side to the external power supply side.

[0015] A vehicle control device according to another aspect of the present disclosure is a vehicle control device mounted on a vehicle. The vehicle includes an inlet connectable to an external power source outside the vehicle, a power conversion device connected to the inlet, a power storage device chargeable using power supplied via the inlet, a first power line connecting the inlet and the power storage device via the power conversion device, a second power line connecting the inlet and the power storage device without passing through the power conversion device, and a first relay switchable between a conductive state that conducts the second power line and a cut-off state that cuts off the conduction of the second power line. The vehicle control device includes an acquisition unit that acquires a voltage that can be supplied from the external power source, and a control unit that controls the first relay to be in a cut-off state when the voltage that can be supplied from the external power source is lower than a voltage range that can charge the power storage device.

[0016] A charging system according to yet another aspect of the present disclosure includes a vehicle and an external power supply outside the vehicle. The vehicle includes an inlet connectable to the external power supply, a power conversion device connected to the inlet, a power storage device chargeable using power supplied via the inlet, a first power line connecting the inlet and the power storage device via the power conversion device, a second power line connecting the inlet and the power storage device without passing through the power conversion device, and a first relay switchable between a conductive state that conducts the second power line and a cut-off state that cuts off the conduction of the second power line. The external power supply includes a control device that controls the first relay. 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 control device switches the first relay to a cut-off state. Effect of the Invention

[0017] 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 that corresponds to the possible output voltage of an external power supply. [Brief description of the drawings]

[0018] [Figure 1] 1 is a diagram illustrating an example of a configuration of a charging system according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram illustrating an example of a detailed configuration of a charging integrated ECU. [Diagram 3] 4 is a flowchart showing an example of a process executed by the EV-ECU. [Figure 4] FIG. 10 is a diagram illustrating an example of a configuration of a vehicle according to a modified example. [Diagram 5] FIG. 13 is a diagram illustrating an example of a detailed configuration of a charging integrated ECU in a modified example. [Figure 6] FIG. 13 is a diagram illustrating an example of a configuration of a vehicle according to another modified example. [Figure 7] 10 is a flowchart showing an example of a process executed by a microcomputer of a charging integrated ECU in another modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and their description will not be repeated.

[0020] Fig. 1 is a diagram that illustrates an example of the configuration of a charging system 1 according to the present embodiment. With reference to Fig. 1, the charging system 1 includes a vehicle 2 and a charging station 800. The vehicle 2 includes a battery pack 10, a step-up / step-down unit 40, an inlet 60, an EV-ECU (Electronic Control Unit) 100, a charging integrated ECU 300, a first load unit 500, and a second load unit 600. The vehicle 2 is assumed to be, for example, an electrically powered vehicle such as an electric vehicle or a hybrid vehicle.

[0021] The battery pack 10 includes a power storage device 12 , a system main relay (SMR: System Mail Relay) unit 20 , a battery ECU 200 , a battery voltage sensor 110 , and a battery current sensor 112 .

[0022] The EV-ECU 100 includes a processor such as a central processing unit (CPU), memories such as a read only memory (ROM) and a random access memory (RAM), and input / output ports (none of which are shown) for inputting and outputting various signals. The EV-ECU 100 manages the operating states of on-board electrical devices such as the SMR unit 20 based on signals from various sensors and programs stored in the memory. The EV-ECU 100 outputs, for example, a signal indicating whether or not the operation of the first relay 52 is permitted by a first command for the first relay 52 generated in the charging integrated ECU 300, to the charging integrated ECU 300 as a permission / prohibition signal DCEN1. Furthermore, the EV-ECU 100 outputs, for example, a signal indicating whether or not the operation of the second relay 54 and the third relay 56 is permitted by a second command and a third command for the second relay 54 and the third relay 56 generated in the charging integrated ECU 300, to the charging integrated ECU 300 as a permission / prohibition signal DCEN2.

[0023] The power storage device 12 is a rechargeable DC power source, and includes, 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 an electric device included in the first load unit 500. The power storage device 12 can also be charged by power supplied from the step-up / step-down unit 40 or the first load unit 500. The power storage device 12 is, for example, an assembled battery made up 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.

[0024] The SMR unit 20 is electrically connected between the power storage device 12, the step-up / step-down unit 40, and the first load unit 500. A close / open command to the SMR unit 20 is issued from the EV-ECU 100. The SMR unit 20 includes, for example, a first SMR 22, a second SMR 24, a third SMR 26, and a pre-charge resistor 28. The close / open command to the SMR unit 20 includes a close / open command to the first SMR 22, a close / open command to the second SMR 24, and a close / open command to the third SMR 26.

[0025] 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 inlet 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 inlet 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 to the second SMR 24 provided on the first negative line NL1. The pre-charge resistor 28 is connected in series with the third SMR 26 on the second negative line NL2.

[0026] The battery ECU 200 includes a processor such as a CPU, memories such as a ROM and a RAM, and input / output ports (none of which are shown) for inputting and outputting various signals. The battery ECU 200 manages the state of charge of the power storage device 12 based on signals received from the battery voltage sensor 110 and the battery current sensor 112 and programs stored in the memory.

[0027] The battery voltage sensor 110 detects a battery voltage VB of the power storage device 12 and transmits a signal indicating the detected battery voltage VB to the battery ECU 200. The battery voltage sensor 110 is provided, for example, between the first positive electrode line PL1 and the first negative electrode line NL1 and in parallel with the power storage device 12. The battery voltage sensor 110 detects the voltage between the first positive electrode line PL1 and the first negative electrode line NL1 as the battery voltage VB.

[0028] The battery current sensor 112 detects a battery current IB flowing through the power storage device 12, and transmits a signal indicating the detected battery current IB to the battery ECU 200. The battery current sensor 112 is connected in series to the second SMR 24, and detects the detected current as the battery current IB.

[0029] The battery ECU 200 calculates the SOC (State Of Charge) of the power storage device 12 using the battery current IB and the battery voltage VB. As a method for calculating the SOC, various known methods can be adopted, such as a method based on current value integration (Coulomb counting) or a method based on open circuit voltage (OCV) estimation. The battery ECU 200 transmits information related to the calculated SOC to the EV-ECU 100 and the charging integration ECU 300.

[0030] The first load unit 500 includes an electric device that operates at a predetermined first voltage (for example, 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 performs power conversion between the battery pack 10 and the MG. The PCU includes, for example, an inverter that drives the MG using power supplied from the battery pack 10, and a converter that adjusts the level of the DC voltage supplied to the inverter (neither shown).

[0031] The MG is driven by an inverter included in the PCU, for example, when the vehicle 2 is running. The power of the MG is transmitted to the drive wheels.

[0032] An inlet 60 is provided on the exterior of the vehicle 2. A step-up / step-down unit 40 is connected to the inlet 60. The step-up / step-down unit 40, for example, steps up or steps down the power supplied to the inlet 60 and supplies the power to a first load unit 500 or a second load unit 600.

[0033] The inlet 60 has a shape that allows attachment of a connector 802 of a charging stand 800, which is an external power source. When the connector 802 is attached to the inlet 60, a contact built into the inlet 60 comes into contact with a contact built into the connector 802, establishing a conductive state between the inlet 60 and the connector 802. The connector 802 is connected to the charging stand 800 via a cable or the like. FIG 1 shows, as an example, a state in which the connector 802 is attached to the inlet 60.

[0034] Charging station 800 is a charging station that allows charging with an upper limit of the charging voltage of, for example, 500V or less.

[0035] The step-up / step-down unit 40 includes a step-up / step-down 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 / step-down ECU 400 .

[0036] The step-up / step-down converter 42 steps up the power supplied from the charging stand 800 in response to a control signal from the step-up / step-down ECU 400, and supplies the stepped-up power to the battery pack 10 and the first load unit 500. Between the step-up / step-down converter 42 and the charging relay unit 50, a second load unit 600 is connected to a power line branched off from the first positive electrode line PL1 and the first negative electrode line NL1. For example, the second load unit 600 may be supplied with power directly from the charging stand 800 via the inlet 60 and the charging relay unit 50. The second load unit 600 includes, for example, an electric device (for example, a PCU, a MG, etc.) that operates at a predetermined second voltage (for example, a voltage of 500 V or less).

[0037] The step-up / step-down ECU 400 includes a processor such as a CPU, memories such as a ROM and a RAM, and input / output ports (none of which are shown) for inputting and outputting various signals. The step-up / step-down ECU 400 controls the step-up / step-down converter 42 based on signals received from the first voltage sensor 150 and the second voltage sensor 152 and programs stored in the memory.

[0038] The first voltage sensor 150 detects the voltage VL input to the step-up / step-down converter 42 (i.e., the voltage between the first positive electrode line PL1 and the first negative electrode line NL1 between the charging relay unit 50 and the step-up / step-down converter 42) and transmits a signal indicative of the detected voltage VL to the step-up / step-down ECU 400.

[0039] The second voltage sensor 152 detects the voltage VH output from the step-up / step-down converter 42 (i.e., the voltage between the first positive electrode line PL1 and the first negative electrode line NL1 between the step-up / step-down converter 42 and the battery pack 10) and transmits a signal indicative of the detected voltage VH to the step-up / step-down ECU 400.

[0040] The charging relay unit 50 is electrically connected between the inlet 60 and the step-up / step-down converter 42. A command to close / open the charging relay unit 50 is issued from the charging integrated ECU 300. The charging relay unit 50 includes a first relay 52, a second relay 54, and a third relay 56.

[0041] The first relay 52 is provided on the second positive line PL2. One end of the second positive line PL2 is connected to a position between an inlet 60 on the first positive line PL1 and a second relay 54 described later. The other end of the second positive line PL2 is connected to a position between a step-up / step-down converter 42 on the first positive line PL1 and the battery pack 10. The second relay 54 is provided at a position between the inlet 60 on the first positive line PL1 and the step-up / step-down converter 42. The third relay 56 is provided at a position between the inlet 60 on the first negative line NL1 and the step-up / step-down converter 42.

[0042] Each of the first relay 52, the second relay 54, and the third relay 56 operates in response to a control signal from the charging integrated ECU 300. That is, the command to close / open the charging relay unit 50 includes a command to close / open the first relay 52, a command to close / open the second relay 54, and a command to close / open the third relay 56.

[0043] The charging integrated ECU 300 includes a microcomputer including a processor such as a CPU, memories such as a ROM and a RAM, and input / output ports for inputting and outputting various signals, and a plurality of logic circuits for outputting drive signals for the first relay 52, the second relay 54, and the third relay 56 using signals output from the microcomputer and signals input from the EV-ECU 100. The microcomputer and the logic circuits will be described later.

[0044] When the connector 802 is attached to the inlet 60, the charging integrated ECU 300 controls at least one of the first relay 52, the second relay 54, and the third relay 56 based on information indicating whether the connector 802 is attached to the inlet 60, information regarding the power supplied from the charging stand 800 obtained from the charging stand 800, a signal received from the third voltage sensor 154, and a program stored in the memory.

[0045] The third voltage sensor 154 detects a voltage VDC between the first negative line NL1 and a connection point of the first positive line PL1 to one end of the second positive line PL2. The third voltage sensor 154 transmits a signal indicating the detected voltage VDC to the charging integrated ECU 300.

[0046] For example, the inlet 60 is provided with a detection circuit or a detection sensor (not shown) that detects whether or not the connector 802 is attached. When the connector 802 is attached to the inlet 60, the detection circuit or the detection sensor outputs a signal indicating the attachment to the charging integrated ECU 300. The charging integrated ECU 300 determines that the connector 802 is attached to the inlet 60 by receiving the signal as information indicating whether or not the connector 802 is attached to the inlet 60.

[0047] Furthermore, the charging integrated ECU 300 controls at least one of the first relay 52, the second relay 54, and the third relay 56 using information related to the power supplied from the charging stand 800. The charging integrated ECU 300 may obtain the information related to the power supplied from the charging stand 800, for example, through wireless communication with the charging stand 800, or may obtain the information related to the power supplied from the charging stand 800 through wired communication using a power line or a communication line.

[0048] The voltage of the power storage device 12 mounted on the vehicle 2 having the above-mentioned configuration is becoming higher, but the charging stand 800 does not necessarily support charging of the high-voltage power storage device. Therefore, by providing the above-mentioned step-up / step-down converter 42 in the vehicle 2, when the charging stand 800 supports the high-voltage power storage device, it becomes possible to supply power to the power storage device 12 from the charging stand without going through the step-up / step-down converter 42 and charge the power storage device 12. Also, when the charging stand 800 does not support the high-voltage power storage device, the step-up / step-down converter 42 is used to step up the voltage to a voltage at which the power storage device 12 can be charged, and then the power is supplied to the power storage device 12, thereby making it possible to charge the power storage device 12. Such an operation is realized by switching the power transmission path using the above-mentioned charging relay unit 50, but if the relay is switched inappropriately, an inrush current or the like may occur.

[0049] Therefore, in this embodiment, when the voltage supplied from the charging stand 800 is lower than the voltage range in which the storage device 12 can be charged, the charging integrated ECU 300 opens the first relay 52 to electrically cut off the second positive electrode line PL2.

[0050] In this way, it is possible to prevent a current from flowing from the power storage device 12 to the charging stand 800. Therefore, it is possible to appropriately switch to a power transmission path that corresponds to the available output voltage of the charging stand 800.

[0051] Furthermore, when the voltage that can be supplied from the charging stand 800, contained in the information regarding the voltage that can be supplied from the charging stand 800, is lower than the voltage range, the EV-ECU 100 turns off the first relay 52 regardless of the command for the first relay 52 generated in the charging integrated ECU 300.

[0052] In this way, even if the charging integrated ECU 300 cannot generate a normal command signal, the first relay 52 can be brought into the cut-off state.

[0053] Hereinafter, a detailed configuration of the charging integrated ECU 300 will be described with reference to Fig. 2. Fig. 2 is a diagram showing an example of a detailed configuration of the charging integrated ECU 300.

[0054] As shown in FIG. 2, the charging integrated ECU 300 includes a microcomputer 302, a first AND (logical product) circuit 304, a second AND circuit 306, and a third AND circuit 308.

[0055] The microcomputer 302 outputs a first command for the first relay 52 to a first AND circuit 304. Furthermore, the microcomputer 302 outputs a second command for the second relay 54 to a second AND circuit 306. Furthermore, the microcomputer 302 outputs a third command for the third relay 56 to a third AND circuit 308. Each of the first command, the second command, and the third command includes, for example, an OFF signal that outputs "0" corresponding to a command to a cutoff state, and an ON signal that outputs "1" corresponding to a command to a conductive state.

[0056] The microcomputer 302 determines the state (either a conductive state or a cut-off state) of each of the first relay 52, the second relay 54, and the third relay 56 based on information related to the voltage that can be supplied from the charging stand 800.

[0057] The microcomputer 302 outputs a signal indicating an ON state (e.g., "1") as a command signal to a logic circuit corresponding to a relay to be brought into a conductive state (hereinafter referred to as a relay to be brought into a conductive state). The microcomputer 302 outputs a signal indicating an OFF state (e.g., "0") as a command signal to a logic circuit corresponding to a relay to be brought into a cut-off state (hereinafter referred to as a relay to be brought into a non-conductive state).

[0058] For example, when the microcomputer 302 determines the first relay 52 as the relay to be turned on and the second relay 54 and the third relay 56 as relays to be turned off, the microcomputer 302 outputs an ON signal to the first AND circuit 304 and outputs an OFF signal to each of the second AND circuit 306 and the third AND circuit 308.

[0059] For example, when the microcomputer 302 determines the first relay 52 as a relay to be non-conductive and determines the second relay 54 and the third relay 56 as relays to be conductive, it outputs an OFF signal to the first ANS circuit 304 and outputs an ON signal to each of the second AND circuit 306 and the third AND circuit 308.

[0060] In addition to the first command, the first AND circuit 304 receives the permission / denial signal DCEN1 from the EV-ECU 100. Furthermore, in addition to the second command, the second AND circuit 306 receives the permission / denial signal DCEN2 from the EV-ECU 100. Furthermore, in addition to the third command, the third AND circuit 308 receives the permission / denial signal DCEN2 from the EV-ECU 100.

[0061] The first AND circuit 304 generates a drive signal DFR1 using the first command from the microcomputer 302 and the permission / denial signal DCEN1 from the EV-ECU 100, and outputs the drive signal DFR1 to the first relay 52.

[0062] Specifically, the first AND circuit 304 outputs a signal corresponding to the logical AND of the first command from the microcomputer 302 and the permission / denial signal DCEN1 from the EV-ECU 100 to the first relay 52 as a drive signal DFR1.

[0063] For example, when the permission / denial signal DCEN1 is a signal indicating permission (for example, 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. ​​That is, when an ON signal is output as the first command from the microcomputer 302, the first AND circuit 304 outputs the ON signal as the drive signal DFR1 to the first relay 52. ​​On the other hand, when an OFF signal is output as the first command from the microcomputer 302, the first AND circuit 304 outputs the OFF signal as the drive signal DFR1 to the first relay 52.

[0064] On the other hand, for example, when the permission / denial signal DCEN1 is a signal indicating prohibition (for example, a signal corresponding to "0"), the first AND circuit 304 outputs an off signal as the drive signal DFR1 to the first relay 52 regardless of whether the first command from the microcomputer 302 is an on signal or an off signal.

[0065] The second AND circuit 306 generates a drive signal DFR2 using the second command from the microcomputer 302 and the permission / denial signal DCEN2 from the EV-ECU 100, and outputs the drive signal DFR2 to the second relay .

[0066] Specifically, the second AND circuit 306 outputs a signal corresponding to the logical AND of the second command from the microcomputer 302 and the permission / denial signal DCEN2 from the EV-ECU 100 to the second relay 54 as a drive signal DFR2.

[0067] For example, when the permission / denial signal DCEN2 is a signal indicating permission (for example, 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. That is, when an ON signal is output from the microcomputer 302 as the second command, the second AND circuit 306 outputs an ON signal to the second relay 54 as the drive signal DFR2.

[0068] On the other hand, for example, when the permission / denial signal DCEN2 is a signal indicating prohibition (for example, a signal corresponding to "0"), the second AND circuit 306 outputs an off signal as the drive signal DFR2 to the second relay 54 regardless of whether the second command from the microcomputer 302 is an on signal or an off signal.

[0069] The third AND circuit 308 generates a drive signal DFR3 using the third command from the microcomputer 302 and the permission / denial signal DCEN2 from the EV-ECU 100, and outputs the drive signal DFR3 to the third relay 56.

[0070] Specifically, the third AND circuit 308 outputs a signal corresponding to the logical AND of the third command from the microcomputer 302 and the permission / denial signal DCEN2 from the EV-ECU 100 to the third relay 56 as a drive signal DFR3.

[0071] The operation of the third AND circuit 308 differs from the operation of the second AND circuit 306 illustrated above in that a third command is input instead of a second command, and a drive signal DFR3 is output instead of a drive signal DFR2. Otherwise, the configuration and operation are the same as those of the second AND circuit, and therefore detailed description thereof will not be repeated.

[0072] For example, when the connector 802 is attached to the inlet 60, the microcomputer 302 determines which relays are to be made conductive and which relays are to be made non-conductive using information related to the voltage that can be supplied from the charging stand 800.

[0073] For example, when the voltage that can be supplied from charging stand 800 is within the voltage range in which power storage device 12 can be charged, microcomputer 302 determines first relay 52 and third relay 56 as relays to be turned on, and determines second relay 54 as a relay to be turned off. Therefore, microcomputer 302 outputs an ON signal as a first command and a third command to first AND circuit 304 and third AND circuit 308, respectively, and outputs an OFF signal as a second command to second AND circuit 306.

[0074] On the other hand, for example, when the voltage that can be supplied from charging stand 800 is lower than the voltage range in which power storage device 12 can be charged, microcomputer 302 determines second relay 54 and third relay 56 as relays to be turned on, and determines first relay 52 as a relay to be turned off. Therefore, microcomputer 302 outputs an ON signal as a second command and a third command to second AND circuit 306 and third AND circuit 308, respectively, and outputs an OFF signal as a first command to first AND circuit 304.

[0075] In addition, for example, when the SOC of the power storage device 12 acquired from the battery ECU 200 falls within a range corresponding to a fully charged state, the microcomputer 302 outputs an off signal as a first command, a second command and a third command to the first AND circuit 304, the second AND circuit 306 and the third AND circuit 308, respectively.

[0076] In the present embodiment of the vehicle 2 having the above-described configuration, as described above, when the voltage that can be supplied from the charging stand 800 is lower than the voltage range in which the power storage device 12 can be charged, the EV-ECU 100 outputs an off signal as the permission / denial signal DCEN1.

[0077] An example of processing executed by EV-ECU 100 will be described below with reference to Fig. 3. Fig. 3 is a flowchart showing an example of processing executed by EV-ECU 100. A series of processing shown in this flowchart is repeatedly executed by EV-ECU 100 at every predetermined control period.

[0078] In step (hereinafter, step will be abbreviated as S) 100, EV-ECU 100 determines whether the available output voltage of charging stand 800 is lower than a predetermined voltage. EV-ECU 100 determines whether the available output voltage of charging stand 800 is lower than the predetermined voltage, for example, by using information related to charging power acquired from charging stand 800. The method of acquiring information related to charging power is as described above, and therefore detailed description thereof will not be repeated. The predetermined voltage is, for example, a voltage of about 500V. If it is determined that the available output voltage of charging stand 800 is lower than the predetermined voltage (YES in S100), processing proceeds to S102.

[0079] In S102, the EV-ECU 100 outputs an OFF signal as the permission / denial signal DCEN1, after which the process proceeds to S104.

[0080] In S104, EV-ECU 100 outputs an ON signal as permission / denial signal DCEN2. Then, the process ends. If it is determined that the available output voltage of charging station 800 is equal to or higher than the predetermined voltage (NO in S100), the process proceeds to S106.

[0081] In S106, the EV-ECU 100 outputs an ON signal as the permission / denial signal DCEN1, after which the process proceeds to S108.

[0082] In S108, EV-ECU 100 outputs an ON signal as permission / denial signal DCEN2, and then the process ends.

[0083] An example of the operation of the EV-ECU 100 and the charging integrated ECU 300 in the present embodiment based on the above-described structure and flowchart will be described.

[0084] For example, it is assumed that connector 802 of charging stand 800 is attached to inlet 60 of stopped vehicle 2. Furthermore, it is assumed that the upper limit of the possible output voltage of charging stand 800 is lower than a predetermined voltage.

[0085] When the connector 802 of the charging stand 800 is attached to the inlet 60, information regarding the charging power is acquired from the charging stand 800, and it is determined whether the output voltage of the charging stand 800 contained in the acquired information is lower than a predetermined voltage (S100).

[0086] If the available output voltage of the charging station 800 is lower than a predetermined voltage (YES in S100), an OFF signal is output to the charging integrated ECU 300 as the permission / denial signal DCEN1 (S102), and an ON signal is output to the charging integrated ECU 300 as the permission / denial signal DCEN2.

[0087] For example, when the connector 802 is attached to the inlet 60 and the available output voltage of the charging stand 800 is lower than a predetermined voltage, the microcomputer 302 of the charging integrated ECU 300 determines the second relay 54 and the third relay 56 as relays to be turned on and determines the first relay 52 as a relay to be turned off. Therefore, the microcomputer 302 outputs an ON signal as a second command and a third command to the second AND circuit 306 and the third AND circuit 308, respectively, and outputs an OFF signal as a first command to the first AND circuit 304.

[0088] When an ON signal is input from the EV-ECU 100 to the second AND circuit 306 and the third AND circuit 308 as the permission / denial signal DCEN2, the second AND circuit 306 and the third AND circuit 308 output ON signals as drive signals DFR2, DFR3 to the second relay 54 and the third relay 56, and the first AND circuit 304 outputs an OFF signal as drive signal DFR1 to the first relay 52. ​​At this time, the second positive line PL2 is cut off and the first positive line PL1 is made conductive. Therefore, power from the charging stand 800 is supplied to the power storage device 12 via the step-up / step-down converter 42.

[0089] In addition, an off signal is input to the first AND circuit 304 as the permission / denial signal DCEN1 from the EV-ECU 100. Therefore, even if an on signal is input to the first AND circuit 304 as the first command due to an abnormality in the microcomputer 302, an off signal is output from the first AND circuit 304 as the drive signal DFR1, thereby preventing the first relay 52 from entering a conductive state.

[0090] If the output voltage of the charging station 800 is higher than a predetermined voltage (NO in S100), an ON signal is output as the permission / denial signal DCEN1 to the charging integrated ECU 300 (S106), and an ON signal is output as the permission / denial signal DCEN2 to the charging integrated ECU 300 (S108).

[0091] For example, when the connector 802 is attached to the inlet 60 and the available output voltage of the charging stand 800 is higher than a predetermined voltage, the microcomputer 302 of the charging integrated ECU 300 determines the first relay 52 and the third relay 56 as relays to be turned on and determines the second relay 54 as a relay to be turned off. Therefore, the microcomputer 302 outputs an ON signal as a first command and a third command to the first AND circuit 304 and the third AND circuit 308, respectively, and outputs an OFF signal as a second command to the second AND circuit 306.

[0092] When an ON signal is input from the EV-ECU 100 to the first AND circuit 304 as the permission / denial signal DCEN1 and an ON signal is input from the EV-ECU 100 to the second AND circuit 306 and the third AND circuit 308 as the permission / denial signal DCEN2, the first AND circuit 304 and the third AND circuit 308 output ON signals as the drive signals DFR1 and DFR3 to the first relay 52 and the third relay 56, respectively, and the second AND circuit 306 outputs an OFF signal as the drive signal DFR2 to the second relay 54. At this time, the second positive line PL2 is made conductive, and the conduction between the connection point of the first positive line PL1 with one end of the second positive line PL2 and the connection point with the other end of the second positive line PL2 is interrupted. Therefore, the power from the charging stand 800 is supplied to the power storage device 12 without passing through the step-up / step-down converter 42.

[0093] As described above, in vehicle 2 according to the present embodiment, when the voltage that can be supplied from charging stand 800, which is an external power source, is lower than the voltage range in which power storage device 12 can be charged, first relay 52 is brought into an interrupted state, thereby making it possible to suppress a current from flowing from power storage device 12 to charging stand 800. In particular, since an OFF signal is input to first AND circuit 304 as permission / denial signal DCEN1, even if an ON signal is input to first AND circuit 304 as a first command due to an abnormality in microcomputer 302, an OFF signal is output from first AND circuit 304, so that first relay 52 can be brought into an interrupted state. Therefore, it is possible to provide a vehicle, a vehicle control device, and a charging system that appropriately switch to a power transmission path that corresponds to the outputtable voltage of the external power source.

[0094] Modifications will be described below. In the above-described embodiment, the permission / denial signals DCEN1, DCEN2 are set depending on whether the output voltage of the charging stand 800 is lower than a predetermined voltage. However, for example, in addition to the output voltage of the charging stand 800, the permission / denial signals DCEN1, DCEN2 may be set depending on whether the voltage VDC detected by the third voltage sensor 154 is greater than a threshold value.

[0095] Fig. 4 is a diagram that illustrates an example of a configuration of a vehicle 2 according to a modified example. The charging integrated ECU 300 illustrated in Fig. 4 differs from the charging integrated ECU 300 illustrated in Fig. 1 in that a detection result of the third voltage sensor 154 is output to the EV-ECU 100 in addition to the charging integrated ECU 300. The rest of the configuration is the same as the configuration of the vehicle 2 illustrated in Fig. 1 except for the cases described below. Therefore, detailed description thereof will not be repeated.

[0096] 4, in this modification, the third voltage sensor 154 is configured to be able to output a signal indicating the detected voltage VDC to each of the charging integrated ECU 300 and the EV-ECU 100. Note that the charging integrated ECU 300 may output the voltage VDC obtained from the third voltage sensor 154 to the EV-ECU 100.

[0097] An example of processing executed by EV-ECU 100 will be described below with reference to Fig. 5. Fig. 5 is a flowchart showing an example of processing executed by EV-ECU 100 in a modified example. A series of processing shown in this flowchart is repeatedly executed by EV-ECU 100 at every predetermined control period.

[0098] In S200, EV-ECU 100 determines whether or not the available output voltage of charging stand 800 is lower than a predetermined voltage. The method of determination is as described above, and therefore detailed description thereof will not be repeated. If it is determined that the available output voltage of charging stand 800 is lower than the predetermined voltage (YES in S200), the process proceeds to S202.

[0099] 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 described as being the same as a predetermined voltage, for example, but it is not limited to being the same as the predetermined voltage as long as it is a value that can at least determine that the voltage on the inlet 60 side is higher than the output voltage of charging stand 800. If it is determined that voltage VDC is greater than threshold value Va (YES in S202), the process proceeds to S204.

[0100] In S204, the EV-ECU 100 outputs an ON signal as the permission / denial signal DCEN1, after which the process proceeds to S206.

[0101] In S206, EV-ECU 100 outputs an OFF signal as permission / denial signal DCEN2, and then the process ends.

[0102] In S208, the EV-ECU 100 outputs an ON signal as the permission / denial signal DCEN1, after which the process proceeds to S210.

[0103] In S210, EV-ECU 100 outputs an ON signal as permission / denial signal DCEN2. Then, the process ends. If it is determined that voltage VDC is equal to or lower than threshold value Va (NO in S202), the process proceeds to S212.

[0104] In S212, the EV-ECU 100 outputs an OFF signal as the permission / denial signal DCEN1, after which the process proceeds to S214.

[0105] In S214, the EV-ECU 100 outputs an ON signal as the permission / denial signal DCEN2, and then the process ends.

[0106] An example of the operation of the EV-ECU 100 and the charging integrated ECU 300 in the present embodiment based on the above-described structure and flowchart will be described.

[0107] For example, it is assumed that the connector 802 of the charging stand 800 is connected to the inlet 60 of the vehicle 2 while the vehicle is stopped. Also, it is assumed that the maximum output voltage of the charging stand 800 is lower than a predetermined voltage.

[0108] When the connector 802 of the charging stand 800 is attached to the inlet 60, information regarding the charging power is acquired from the charging stand 800, and it is determined whether the output voltage of the charging stand 800 contained in the acquired information is lower than a predetermined voltage (S200).

[0109] If the output voltage of the charging station 800 is lower than a predetermined voltage (YES in S200) and the voltage VDC is equal to or lower than the threshold value Va (NO in S202), an OFF signal is output to the charging integrated ECU 300 as the permission / denial signal DCEN1 (S212), and an ON signal is output to the charging integrated ECU 300 as the permission / denial signal DCEN2.

[0110] Therefore, an OFF signal is output from the first AND circuit 304 to the first relay 52 as the drive signal DFR1, an ON signal is output from the second AND circuit 306 to the second relay 54 as the drive signal DFR2, and an ON signal is output from the third AND circuit 308 to the third relay 56 as the drive signal DFR3. At this time, the conduction of the second positive electrode line PL2 is interrupted, and the first positive electrode line PL1 is made conductive. Therefore, power from the charging stand 800 is supplied to the power storage device 12 via the step-up / step-down converter 42.

[0111] In addition, an off signal is input to the first AND circuit 304 as the permission / denial signal DCEN1 from the EV-ECU 100. Therefore, even if an on signal is input to the first AND circuit 304 as the first command due to an abnormality in the microcomputer 302, an off signal is output from the first AND circuit 304 as the drive signal DFR1, thereby preventing the first relay 52 from entering a conductive state.

[0112] On the other hand, when an abnormality occurs such as the first relay being stuck in the on state or an abnormality occurs in the step-up / step-down converter 42 causing the voltage of the storage device 12 to be supplied to the inlet 60, and thus the voltage VDC becomes higher than the threshold value Va (YES in S202), an off signal is output as the permission / denial signal DCEN1, and an off signal is output as the permission / denial signal DCEN2.

[0113] As a result, even if an ON signal is output as the second command and the third command, an OFF signal is output from the first AND circuit 304 to the first relay 52 as the drive signal DFR1, an OFF signal is output from the second AND circuit 306 to the second relay 54 as the drive signal DFR2, and an OFF signal is output from the third AND circuit 308 to the third relay 56 as the drive signal DFR3. At this time, the first positive electrode line PL1, the second positive electrode line PL2, and the first negative electrode line NL1 are all in an interrupted state. Therefore, it is possible to suppress a current from flowing from the power storage device 12 to the charging stand 800.

[0114] Furthermore, in the above embodiment, a configuration in which one relay is provided on the second positive electrode line PL2 has been described as an example, but two relays may be provided on the second positive electrode line PL2.

[0115] Fig. 6 is a diagram that illustrates an example of a configuration of a vehicle 2 according to another modified example. The charging integrated ECU 300 illustrated in Fig. 6 differs from the vehicle 2 illustrated in Fig. 1 in that a fourth relay 58 is further provided for the second positive electrode line PL2 in addition to the first relay 52. ​​The rest of the configuration is the same as the configuration of the vehicle 2 illustrated in Fig. 1 except as described below. Therefore, detailed description thereof will not be repeated.

[0116] 6, in this modification, a first relay 52 and a fourth relay 58 connected in series to each other are provided in the second positive electrode line PL2. Note that the charging integrated ECU 300 may be configured to output a drive signal DFR1 from the first AND circuit 306 to the first relay 52 and to output a drive signal DFR4 from the first AND circuit 306 to the fourth relay 58, for example. Alternatively, the charging integrated ECU 300 may be configured to further include a fourth AND circuit (not shown) that outputs a logical AND of DCEN1 and the first command from the microcomputer 302, and to output a drive signal DFR4 from the fourth AND circuit to the fourth relay 58.

[0117] In this way, even if an on signal is unintentionally output as the first command due to an abnormality in microcomputer 302 as described above, the permission / denial signal DCEN1 is an off signal, so that the first relay 52 and the fourth relay 58 can be maintained in an off state. Furthermore, even if either the first relay 52 or the fourth relay 58 is stuck in the on state, the continuity of the second positive line PL2 can be cut off using the relay that is not stuck.

[0118] Furthermore, for example, after charging is completed, the stuck state of at least any of the first relay 52, the second relay 54, the third relay 56 and the fourth relay 58 can be detected by switching between a conductive state and a cut-off state.

[0119] 7 is a flowchart showing an example of processing executed by the microcomputer 302 of the charging integrated ECU 300 in another modified example. A series of processing shown in this flowchart is executed when an execution condition is met, such as after charging is completed, in the microcomputer 302. For ease of explanation, it is assumed that the EV-ECU 100 outputs on signals as the permission / denial signals DCEN1 and DCEN2.

[0120] In S300, the microcomputer 302 sets the first relay 52, the second relay 54, the third relay 56, and the fourth relay 58 to their initial states. That is, the microcomputer 302 outputs an ON signal as the first command, the third command, and the fourth command, and outputs an OFF signal as the second command.

[0121] In S302, the microcomputer 302 sets the third relay 56 to an OFF state. That is, the microcomputer 302 outputs an OFF signal as a third command.

[0122] In S304, microcomputer 302 determines whether voltage VDC is less than predetermined value A. Predetermined value A is, for example, a predetermined value that is lower than the voltage of power storage device 12. If it is determined that voltage VDC is less than predetermined value A (YES in S304), the process proceeds to S306.

[0123] In S306, microcomputer 302 sets first relay 52 to the OFF state. That is, microcomputer 302 outputs an OFF signal as a first command. Thereafter, the process proceeds to S310. If it is determined that voltage VDC is not less than predetermined value A (NO in S304), the process proceeds to S308.

[0124] In S308, the microcomputer 302 determines that the third relay 56 is stuck in the on state. The microcomputer 302 sets, for example, a failure determination flag indicating that the third relay 56 is stuck in the on state to the on state. After that, the process proceeds to S306.

[0125] In S310, the microcomputer 302 sets the third relay 56 to the ON state. Then, the process proceeds to S312.

[0126] 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 it is determined that voltage VDC is less than predetermined value B (YES in S312), the process proceeds to S314.

[0127] In S314, the microcomputer 302 sets the fourth relay 58 to the OFF state. That is, the microcomputer 302 outputs an OFF signal as a fourth command. Thereafter, the process proceeds to S318. If it is determined that the voltage VDC is not less than the predetermined value B (NO in S312), the process proceeds to S316.

[0128] In S316, the microcomputer 302 determines that the first relay 52 is stuck in the on state. The microcomputer 302 sets, for example, a failure determination flag indicating that the first relay 52 is stuck in the on state to the on state. After that, the process proceeds to S314.

[0129] In S318, the microcomputer 302 sets the first relay 52 to the ON state. Then, the process proceeds to S320.

[0130] 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 both predetermined value A and predetermined value B. If it is determined that voltage VDC is less than predetermined value C (YES in S320), the process proceeds to S322.

[0131] In S322, the microcomputer 302 sets the third relay 56 to the off state. Then, the process proceeds to S326. If it is determined that the voltage VDC is not less than the predetermined value C (NO in S320), the process proceeds to S324.

[0132] In S324, the microcomputer 302 determines that the fourth relay 58 is stuck in the on state. The microcomputer 302 sets, for example, a failure determination flag indicating that the fourth relay 58 is stuck in the on state to the on state. After that, the process proceeds to S322.

[0133] In S326, the microcomputer 302 sets the first relay 52 to the OFF state. Then, the process proceeds to S328.

[0134] 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 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.

[0135] In S330, microcomputer 302 outputs the determination result. Microcomputer 302 may output, for example, information indicating that repair is necessary, information about the fault location based on the states of various fault determination flags, or the like, as the determination result to a display device, etc. If it is determined that voltage VDC is not less than predetermined value D (NO in S328), the process proceeds to S332.

[0136] In S332, the microcomputer 302 determines that both the first relay 52 and the third relay 56 of both poles are stuck in the ON state. Then, the process proceeds to S330.

[0137] The operation of the charging integrated ECU 300 in this modified example based on the above-described structure and flowchart will be described.

[0138] For example, assume that charging of power storage device 12 is completed. At this time, after being 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), it is determined that third relay 56 is stuck in the on state (S308).

[0139] Thereafter, or when it is determined that the voltage VDC is less than the predetermined value A (YES in S304), the first relay 52 is set to the OFF state (S306) and the third relay 56 is set to the ON state (S310). At this time, when it is determined that the voltage VDC is not less than the predetermined value B (NO in S312), it is determined that the first relay 52 is stuck in the ON state (S316).

[0140] Thereafter, or when it is determined that the voltage VDC is less than the predetermined value B (YES in S312), the fourth relay 58 is set to the OFF state (S314), and the first relay 52 is set to the ON state (S318).

[0141] At this time, if the voltage VDC is not less than the predetermined value C (NO in S320), it is determined that the fourth relay 58 is stuck in the on state (S324).

[0142] Thereafter, or when it is determined that the voltage VDC is less than the predetermined value C (YES in S320), the third relay 56 is set to the OFF state (S322), and the first relay 52 is set to the OFF state (S326).

[0143] At this time, if the voltage VDC is not less than the predetermined value D (NO in S328), it is determined that both the first relay 52 and the third relay 56 are stuck in the on state (S332).

[0144] Thereafter, or if voltage VDC is less than predetermined value D (YES in S328), the result of the determination is output (S330).

[0145] In this way, it is possible to determine with high accuracy whether or not each relay is stuck in the on state.

[0146] Furthermore, in the above-described embodiment, the permission / denial signals DCEN1, DCEN2 generated in the EV-ECU 100 are described as being output to the charging integrated ECU 300. However, for example, the permission / denial signals DCEN1, DCEN2 may be generated in a control device (not shown) included in the charging stand 800, and the generated permission / denial signals DCEN1, DCEN2 may be input to the charging integrated ECU 300.

[0147] The above-described modified examples may be implemented in whole or in part in appropriate combination. The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0148] 1 Charging system, 2 Vehicle, 10 Battery pack, 12 Energy storage device, 20 SMR unit, 28 Precharge resistor, 40 Step-up / down unit, 42 Step-up / down converter, 50 Charging relay unit, 52 First relay, 54 Second relay, 56 Third relay, 58 Fourth relay, 60 Inlet, 100 EV-ECU, 110 Battery voltage sensor, 112 Battery current sensor, 150 First voltage sensor, 152 Second voltage sensor, 154 Third voltage sensor, 200 Battery ECU, 300 Charging integration ECU, 302 Microcomputer, 304 First AND circuit, 306 Second AND circuit, 308 Third AND circuit, 400 Step-up / down ECU, 500 First load unit, 600 Second load unit, 800 Charging stand, 802 Connector.

Claims

1. an inlet connectable to an external power source outside the vehicle; A power converter connected to the inlet; a power storage device that can be charged using power supplied via the inlet; a first power line connecting the inlet and the power storage device via the power conversion device; a second power line that connects the inlet and the power storage device without passing through the power conversion device; a first relay switchable between a conductive state in which the second power line is conductive and a cut-off state in which the second power line is cut off; A first control device that controls the first relay; a second control device different from the first control device; the first control device brings the first relay into the cut-off 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; The second control device acquires information regarding a voltage that can be supplied from the external power source, and if the voltage that can be supplied from the external power source included in the acquired information is lower than the voltage range, the second control device brings the first relay into the cut-off state regardless of a command for the first relay generated in the first control device.

2. the vehicle further includes a second relay switchable between a conductive state in which the first power line is conductive and a cut-off state in which the first power line is cut off, 2 . The vehicle according to claim 1 , wherein the first control device brings the first relay into the conductive state and the second relay into the cut-off state when a voltage that can be supplied from the external power supply is within the voltage range.

3. The vehicle further includes a detection device for detecting a voltage at the inlet.

3. The vehicle according to claim 2, wherein the second control device brings the first relay and the second relay into the cut-off state regardless of a command for the first relay and the second relay generated in the first control device when the externally supplyable voltage is lower than the voltage range and the voltage at the inlet is higher than a threshold value.

4. A vehicle control device mounted on a vehicle, the vehicle including: an inlet connectable to an external power supply outside the vehicle; a power conversion device connected to the inlet; a power storage device chargeable using power supplied via the inlet; a first power line connecting the inlet and the power storage device via the power conversion device; a second power line connecting the inlet and the power storage device without passing through the power conversion device; and a first relay switchable between a conductive state that connects the second power line and a cut-off state that cuts off the continuity of the second power line, The vehicle control device includes: an acquisition unit that acquires a voltage that can be supplied from the external power source; a first control unit that controls the first relay so that the first relay is brought into the cut-off 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; A second control unit different from the first control unit, The second control unit acquires information regarding a voltage that can be supplied from the external power source, and when the voltage that can be supplied from the external power source included in the acquired information is lower than the voltage range, the second control unit brings the first relay into the cut-off state regardless of a command for the first relay generated in the first control unit.

5. Vehicles and an external power source outside the vehicle; The vehicle is an inlet connectable to the external power source; A power converter connected to the inlet; a power storage device that can be charged using power supplied via the inlet; a first power line connecting the inlet and the power storage device via the power conversion device; a second power line that connects the inlet and the power storage device without passing through the power conversion device; a first relay switchable between a conductive state in which the second power line is conductive and a cut-off state in which the second power line is cut off, the external power supply includes a first control device that controls the first relay and a second control device different from the first control device; the first control device brings the first relay into the cut-off state when a 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 acquires information regarding the voltage that can be supplied from the external power source, and if the voltage that can be supplied from the external power source included in the acquired information is lower than the voltage range, the second control device brings the first relay into the cut-off state regardless of a command for the first relay generated in the first control device.

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