Vehicle and vehicle control device

Abstract

To appropriately diagnose welding when the sequence of electric charging or discharging is repeated without intervention by a user.SOLUTION: A vehicle performs charging or discharging in accordance with the sequence that can ensure a standby period before insulation diagnosis after communication for starting charging or discharging (step S113). The vehicle includes: a power storage device capable of charging / discharging electric power; a charging relay configured to switch opening / closing of a contact point that shuts down or connects an electric path between a DC power supply facility and a power storage device; and an ECU configured to control charging / discharging of the power storage device and the charging relay. The ECU executes welding diagnosis of the contact point after controlling the contact point of the charging relay to be opened (step S123), determines whether or not the welding diagnosis is normally ended (step S124), and executes the welding diagnosis during the standby period when it is determined that the welding diagnosis is not normally ended at the time of controlling the contact point to be closed (step S131, step S132).SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a vehicle and a control device for the vehicle, and more particularly to a vehicle and a control device for the vehicle that charges or discharges according to a sequence that can ensure a waiting period before insulation diagnosis after communication to start charging or discharging. [Background technology]

[0002] In the past, in electric vehicles, even if DC charging was terminated before a diagnosis of welding of a charging relay provided between an inlet that connects a connector of a charging cable and an electricity storage device was completed, a diagnosis of welding was performed again when the lid covering the inlet was closed, and the vehicle was allowed to run even if one side of the charging relay was diagnosed as welding (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-73110 A Summary of the Invention [Problem to be solved by the invention]

[0004] There are standards for repeating a charge / discharge sequence multiple times, such as the charge / discharge sequences of V2G (Vehicle to Grid), V2H (Vehicle to Home), and V1G (Vehicle One Grid). In systems that comply with these standards, there is no timing for a user to intervene when switching between charge and discharge, and the user does not close the inlet cover. For this reason, when using the technology of Patent Document 1 in a system that complies with these standards, if the diagnosis of welding of the charging relay is not completed at the end of charging and discharging, a problem occurs in that it is not possible to re-diagnose welding when charging and discharging are resumed, and therefore charging and discharging cannot be resumed.

[0005] This disclosure has been made to solve such problems, and its purpose is to provide a vehicle and a vehicle control device that are capable of appropriately diagnosing welding when repeating a charging or discharging sequence without user intervention. [Means for solving the problem]

[0006] The vehicle according to this disclosure is a vehicle that charges or discharges according to a sequence that can ensure a standby period before an insulation diagnosis after communication for starting charging or discharging. The vehicle includes a power storage device that can charge or discharge electric power, a relay that switches between opening and closing a contact that cuts off or connects an electric path between an external device and the power storage device, and a control device that controls the charging and discharging of the power storage device and the relay. The control device executes a welding diagnosis of the contact after controlling the relay contact to open, determines whether the welding diagnosis has ended normally, and executes the welding diagnosis during the standby period if it determines that the welding diagnosis has not ended normally when controlling the contact to close.

[0007] According to this configuration, if the contact welding diagnosis is not normally completed after the relay contacts are controlled to be open, the welding diagnosis is executed during the waiting period before the insulation diagnosis after the communication for starting the charge or discharge. As a result, the welding diagnosis can be appropriately executed when the charge or discharge sequence is repeated without the intervention of the user.

[0008] The control device may be configured to execute an insulation diagnosis after executing the welding diagnosis during the standby period. With this configuration, it is possible to prevent the insulation diagnosis from being executed before the welding diagnosis has been completed.

[0009] The control device may include a memory, store the execution result of the welding diagnosis in the memory, and determine whether the welding diagnosis has been completed normally using the execution result stored in the memory. With this configuration, it becomes possible to appropriately determine whether the welding diagnosis has been completed normally.

[0010] The control device may store in the memory, as a result of the execution of the welding diagnosis, information indicating that the contacts are welded, information indicating that the contacts are not welded, or information indicating that the welding diagnosis did not end normally. With this configuration, it becomes possible to appropriately determine whether the welding diagnosis ended normally or not, using the execution result of the welding diagnosis.

[0011] According to another aspect of the disclosure, a vehicle control device charges or discharges according to a sequence that can ensure a standby period before an insulation diagnosis after communication for starting charging or discharging. The vehicle includes an electricity storage device that can charge and discharge electric power, and a relay that switches between opening and closing a contact that cuts off or connects an electric path between an external device and the electricity storage device. The control device controls charging and discharging of the electricity storage device and the relay, performs a welding diagnosis of the contact after controlling the relay contact to open, determines whether the welding diagnosis has ended normally, and performs the welding diagnosis during the standby period if it is determined that the welding diagnosis has not ended normally when controlling the contact to close.

[0012] According to this configuration, welding can be appropriately diagnosed when a charging or discharging sequence is repeated without user intervention. Effect of the Invention

[0013] According to this disclosure, it is possible to provide a vehicle and a vehicle control device that are capable of appropriately diagnosing welding when a charging or discharging sequence is repeated without user intervention. [Brief description of the drawings]

[0014] [Figure 1] 1 is a block diagram showing an example of the configuration of a charge / discharge system including a vehicle 10 according to the present embodiment. [Diagram 2] 4 is a flowchart showing the flow of a charge / discharge control process executed by an ECU of the vehicle in this embodiment. [Diagram 3]5 is a flowchart showing a flow of a welding diagnosis process during signal transmission / reception executed by an ECU of the vehicle in this embodiment. [Figure 4] 10 is a flowchart showing a flow of a charging control process executed by an ECU of a vehicle in a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] 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.

[0016] [First embodiment] FIG. 1 is a block diagram showing a configuration example of a charging / discharging system 1 including a vehicle 10 according to the present embodiment. With reference to FIG. 1, the charging / discharging system 1 includes a vehicle 10 and a DC power supply facility 200. An example will be described in which the vehicle 10 according to the present embodiment is an electric vehicle. However, the present invention is not limited to this, and the vehicle 10 is not limited to an electric vehicle as long as it is capable of DC charging, in which the vehicle-mounted power storage device 11 is charged by receiving direct current power supplied from the DC power supply facility 200 and is capable of discharging from the power storage device 11 to the DC power supply facility 200. For example, the vehicle 10 may be a plug-in hybrid vehicle or a fuel cell vehicle.

[0017] Vehicle 10 includes a power storage device 11, a monitoring unit 15, system main relays (hereinafter also referred to as "SMR (System Main Relay)") 21, 22, a power control unit (hereinafter also referred to as "PCU (Power Control Unit)") 30, a motor generator (hereinafter also referred to as "MG (Motor Generator)") 40, a power transmission gear 50, driving wheels 55, a display device 60, and an ECU (Electronic Control Unit) 100. Vehicle 10 also includes charging relays 71, 72, a voltage sensor 80, an inlet 90, and a communication device 130.

[0018] The power storage device 11 is mounted on the vehicle 10 as a driving power source (i.e., a power source) of the vehicle 10. The power storage device 11 is configured to include a plurality of stacked batteries. The batteries are, for example, secondary batteries such as nickel-metal hydride batteries and lithium-ion batteries. The batteries may be batteries having a liquid electrolyte between the positive and negative electrodes, or may be batteries having a solid electrolyte (all-solid-state batteries). The power storage device 11 may be any rechargeable DC power source, and a large-capacity capacitor may also be used.

[0019] The monitoring unit 15 monitors the state of the power storage device 11. Specifically, the monitoring unit 15 includes a voltage sensor 16, a current sensor 17, and a temperature sensor 18. The voltage sensor 16 detects the voltage of the power storage device 11. The current sensor 17 detects the current input to and output from the power storage device 11. The temperature sensor 18 detects the temperature of the power storage device 11. Each sensor outputs the detection result to the ECU 100.

[0020] The SMRs 21 and 22 are electrically connected between the power storage device 11 and the power lines PL and NL. Specifically, one end of the SMR 21 is electrically connected to the positive terminal of the power storage device 11, and the other end is electrically connected to the power line PL. One end of the SMR 22 is electrically connected to the negative terminal of the power storage device 11, and the other end is electrically connected to the power line NL. The open / closed states of the SMRs 21 and 22 are controlled by a control signal from the ECU 100. The open state is a state in which the relay contacts are open and the electric circuits before and after the contacts are connected. The closed state is a state in which the relay contacts are closed and the electric circuits before and after the contacts are interrupted.

[0021] PCU 30 collectively represents a power conversion device for receiving electric power from power storage device 11 and driving MG 40. PCU 30 is electrically connected to power lines PL, NL, and is controlled by ECU 100. PCU 30 includes, for example, an inverter for driving MG 40, a converter for boosting the electric power output from power storage device 11 and supplying the boosted power to the inverter, and the like.

[0022] The MG40 is an AC rotating electric machine, for example, a permanent magnet type synchronous motor having a rotor in which a permanent magnet is embedded. The rotor of the MG40 is mechanically connected to the drive wheels 55 via the power transmission gear 50. The MG40 generates kinetic energy for running the vehicle 10 by receiving AC power from the PCU 30. The kinetic energy generated by the MG40 is transmitted to the power transmission gear 50. On the other hand, when the vehicle 10 is decelerated or stopped, the MG40 converts the kinetic energy of the vehicle 10 into electric energy. The AC power generated by the MG40 is converted to DC power by the PCU 30 and supplied to the power storage device 11. This allows regenerative power to be stored in the power storage device 11. In this way, the MG40 is configured to generate a driving force or a braking force for the vehicle 10, accompanied by the exchange of power between the MG40 and the power storage device 11 (i.e., charging and discharging the power storage device 11).

[0023] When vehicle 10 is configured as a plug-in hybrid vehicle further equipped with an engine (not shown) as a power source, the output of the engine can be used as driving force for traveling in addition to the output of MG 40. Alternatively, a motor generator (not shown) that generates electricity using the engine output can be further equipped, and charging power for electricity storage device 11 can be generated using the engine output.

[0024] The display device 60 is configured to display predetermined information to the user of the vehicle 10 in response to a control command from the ECU 100. The display device 60 may be, for example, a multi-information display provided on an instrument panel of the vehicle 10 or a display screen of a navigation device, or may be provided separately from these.

[0025] Charging relays 71, 72 are electrically connected between power lines PL, NL and inlet 90. Specifically, one end of charging relay 71 is electrically connected to power line PL, and the other end is electrically connected to inlet 90 via power line CPL. One end of charging relay 72 is electrically connected to power line NL, and the other end is electrically connected to inlet 90 via power line CNL. The open / closed states of charging relay 71 and charging relay 72 are each controlled by a control signal from ECU 100.

[0026] The inlet 90 is configured to be connectable to a connector 310 provided at the tip of a charging cable 300 of the DC power supply equipment 200. The charging cable 300 includes power lines L1, L2, a communication signal line L3, and a charging start / stop signal line L4. When the connector 310 is connected to the inlet 90, the power lines L1, L2, the communication signal line L3, and the charging start / stop signal line L4 of the DC power supply equipment 200 are connected to the power lines CPL, CNL, the communication signal line SL, and the charging start / stop signal line XL of the vehicle 10, respectively.

[0027] The voltage sensor 80 is configured to detect a potential difference between the power lines CPL and CNL. That is, the voltage sensor 80 is configured to detect a voltage applied to the inlet 90. The voltage sensor 80 outputs a result of the detection to the ECU 100.

[0028] The communication device 130 is configured to be able to communicate with the DC power supply equipment 200 via a communication signal line SL. The communication between the vehicle 10 and the DC power supply equipment 200 is performed, for example, according to a communication protocol of a Controller Area Network (CAN). Hereinafter, communication according to the CAN communication protocol is also referred to as "CAN communication." Note that the communication between the vehicle 10 and the DC power supply equipment 200 is not limited to CAN communication, and may be performed, for example, by power line communication (PLC) or wireless communication.

[0029] The ECU 100 includes a CPU (Central Processing Unit) 110, a memory 120, and an input / output buffer (not shown), and receives input of signals from various sensors and outputs control signals to each device, while controlling each device. Note that these controls are not limited to processing by software, and can also be performed by configuring and processing using dedicated hardware (electronic circuits).

[0030] The ECU 100 is configured to be able to calculate the SOC (State Of Charge) of the power storage device 11. As a method of calculating the SOC of the power storage device 11, various known methods using the voltage of the power storage device 11 detected by the monitoring unit 15, the current input / output to / from the power storage device 11, and the like can be adopted.

[0031] The ECU 100 outputs the calculated SOC of the power storage device 11, the voltage of the power storage device 11, and the like to the DC power supply equipment 200 via the communication device 130. In addition, the ECU 100 transmits various commands via the communication device 130 to the DC power supply equipment 200, such as an output command requesting the DC power supply equipment 200 to output power, a stop command requesting the DC power supply equipment 200 to stop outputting power, and a charging current command value.

[0032] The ECU 100 controls the open / closed states of the SMRs 21 and 22. The ECU 100 also controls the open / closed states of the charging relays 71 and 72.

[0033] The DC power supply facility 200 includes a power conditioning system (PCS) 210, a communication device 220, a control device 230, a charging start switch 240, a charging stop switch 250, a leakage detector 260, and a relay D1.

[0034] The PCS 210 converts the AC power supplied from the power system 400 during charging into DC power.

[0035] The communication device 220 is configured to be capable of CAN communication with the communication device 130 of the vehicle 10 via a communication signal line L3.

[0036] The earth leakage detector 260 is provided in a power supply path to the vehicle 10, and detects the presence or absence of an earth leakage in the supply path. Specifically, the earth leakage detector 260 detects an equilibrium state of currents flowing in opposite directions in the power lines L1 and L2 that constitute the supply path, and detects the occurrence of an earth leakage when the equilibrium state is broken. The earth leakage detector 260 outputs the detection result to the control device 230.

[0037] The relay D1 is electrically connected between the output terminal of the power supply VCC and the charging start / stop signal line L4. The power supply VCC is a power supply for supplying drive power to each part such as the communication device 220 and the control device 230. The power supply VCC is generated, for example, by a power supply circuit (not shown) that receives DC power output from the PCS 210. The relay D1 connects / disconnects the path between the output terminal of the power supply VCC and the charging start / stop signal line L4 in response to a control signal from the control device 230.

[0038] The charging start switch 240 is a switch for starting DC charging. The charging start switch 240 is operated by a user when DC charging is started. When the charging start switch 240 is operated, the DC power supply equipment 200 starts a charging sequence.

[0039] Charging stop switch 250 is a switch for stopping DC charging. Charging stop switch 250 is operated by a user during DC charging, for example. When charging stop switch 250 is operated, DC power supply equipment 200 stops DC charging.

[0040] The control device 230 controls the relay D1 and the PCS 210 based on information received from the communication device 220, the operation of the charging start switch 240, and the charging stop switch 250.

[0041] In the past, in vehicle 10, even if DC charging was terminated without completing the diagnosis of welding of charging relays 71, 72 provided between inlet 90, which connects connector 310 of charging cable 300, and power storage device 11, there were some vehicles that would perform the diagnosis of welding again when the lid covering inlet 90 was closed, and would allow vehicle 10 to run even if one side of charging relays 71, 72 was diagnosed as welding.

[0042] There are standards for repeating a charge / discharge sequence multiple times, such as the charge / discharge sequences of V2G, V2H, and V1G. In a charge / discharge system 1 conforming to these standards, there is no timing for a user to intervene when switching between charge and discharge, and the user will not close the lid of the inlet 90. For this reason, when the above-mentioned conventional technology is used in a charge / discharge system 1 conforming to these standards, if the diagnosis of welding of the charging relays 71, 72 is not completed at the end of charging / discharging, a problem occurs in that the charging / discharging cannot be resumed when charging / discharging is resumed because a re-diagnosis of welding cannot be performed.

[0043] Therefore, the ECU 100 of the vehicle 10 in the charging / discharging system 1 of this disclosure performs a contact welding diagnosis after controlling the contacts of the charging relays 71, 72 to be open, determines whether the welding diagnosis has ended normally, and when controlling the contacts to be closed, if it determines that the welding diagnosis has not ended normally, performs the welding diagnosis during the waiting period that can be secured before the insulation diagnosis after communication to start charging or discharging.

[0044] As a result, if the contact welding diagnosis is not completed normally after the contacts of the charging relays 71, 72 are controlled to be open, the welding diagnosis is executed during the waiting period before the insulation diagnosis after the communication for starting charging or discharging. As a result, the welding diagnosis can be executed appropriately when the charging or discharging sequence is repeated without the intervention of the user.

[0045] Conventionally, there exists a VPP (Virtual Power Plant) in which a plurality of energy resources are bundled together and function as if they were a single power plant, with the power storage device 11 and the like functioning as one of the distributed energy resources. When the power storage device 11 of the vehicle 10 is used in this VPP, it may be used for charging and discharging between the power storage device 11 of the vehicle 10 and an external electrical facility such as an external power system 400. In such a case, charging and discharging are repeated between the power storage device 11 of the vehicle 10 and the external electrical facility without user intervention such as plugging and unplugging the connector 310 or operating a switch for charging and discharging.

[0046] 2 is a flowchart showing the flow of a charge / discharge control process executed by the ECU 100 of the vehicle 10 in this embodiment. This charge / discharge control process is called by the ECU 100 from a higher-level process at predetermined intervals and executed.

[0047] Referring to FIG. 2, in a VPP, an aggregator server that bundles a plurality of energy resources issues instructions to a control device (here, control device 230 of DC power supply equipment 200) of each energy resource (here, power storage device 11 of vehicle 10) regarding the supply and demand of power between the energy resource and an electrical facility (here, power system 400) in cooperation with ECU 100 of vehicle 10 in response to the instructions regarding the supply and demand of power.

[0048] In the charge / discharge control process, first, the CPU 110 of the ECU 100 of the vehicle 10 determines whether or not an instruction to resume charging / discharging has been received from the DC power supply equipment 200 after charging / discharging in response to an instruction on power supply and demand from the aggregator has been interrupted (step S111).

[0049] If it is determined that there is no instruction to resume charging / discharging (NO in step S111), the CPU 110 determines whether or not there has been an initial instruction to start charging / discharging from the DC power supply equipment 200 after the connector 310 was connected to the inlet 90 (step S112).

[0050] If it is determined that there has been an initial instruction to start charging / discharging (YES in step S112), CPU 110 transmits and receives a signal before insulation diagnosis between DC power supply equipment 200 and vehicle 10 as a sequence for charging / discharging (step S113).

[0051] For example, in the case of the GB / T V2G standard, signals transmitted and received before insulation diagnosis include a CDC signal for transmitting from the charger to the vehicle 10 that a physical connection between a charger or discharger such as DC power supply equipment 200 and the vehicle 10 has been detected to be complete, a BDC signal for transmitting from the vehicle 10 to the charger or discharger that a CDC signal has been received, a CHM signal for transmitting from the charger to the vehicle 10 that a control power supply has been detected to be complete in the charger, and a BHM signal for transmitting from the vehicle 10 to the charger or discharger that a CHM signal has been received. In the GB / T V2G standard, waiting periods are provided in the period from the output of the CDC signal to the output of the BDC signal and in the period from the output of the CHM signal to the output of the BHM signal.

[0052] After transmitting and receiving the signal before the insulation diagnosis, CPU 110 executes insulation diagnosis of the power line for charging and discharging (step S114). In the insulation diagnosis, it is diagnosed whether insulation is maintained between the power line between vehicle 10 and DC power supply equipment 200 and other parts. Specifically, CPU 110 determines whether insulation is maintained depending on whether a signal indicating that leakage detector 260 of DC power supply equipment 200 has not detected a leakage has been received from DC power supply equipment 200.

[0053] When the insulation diagnosis determines that insulation is maintained, the CPU 110 cooperates with the control device 230 of the DC power supply equipment 200 to execute control of either charging or discharging (step S115).

[0054] If it is determined that there is no initial instruction to start charging or discharging (NO in step S112), or after step S115, the CPU 110 determines whether or not there has been an instruction from the DC power supply equipment 200 to switch from charging to discharging or an instruction to switch from discharging to charging (step S121).

[0055] When it is determined that there is an instruction to switch between charging and discharging (YES in step S121), CPU 110 stops charging and discharging (step S122), executes a welding diagnosis of charging relays 71, 72, and stores the execution result of the welding diagnosis in memory 120 (step S123). Specifically, CPU 110 stores in memory 120, as the execution result of the welding diagnosis, information indicating a result that the contacts are welded, information indicating a result that the contacts are not welded, or information indicating a result that the welding diagnosis did not end normally.

[0056] For example, in the welding diagnosis, welding is determined as follows: CPU 110 outputs a control signal to charging relays 71, 72 to open both of them, determines whether the absolute value of voltage VDC detected by voltage sensor 80 is equal to or less than a predetermined voltage (for example, 0 V), and if it determines that it is not equal to or less than the predetermined voltage, determines that the contacts of both charging relays 71, 72 are welded. CPU 110 outputs a control signal to open charging relay 71 and outputs a control signal to close charging relay 72, determines whether the absolute value of voltage VDC detected by voltage sensor 80 is equal to or less than a predetermined voltage (for example, 0 V), and if it determines that it is not equal to or less than the predetermined voltage, determines that the contacts of charging relay 71 are welded. CPU 110 outputs a control signal to open charging relay 72 and a control signal to close charging relay 71, and determines whether the absolute value of voltage VDC detected by voltage sensor 80 is equal to or lower than a predetermined voltage (for example, 0 V). If it determines that the absolute value is not equal to or lower than the predetermined voltage, it determines that the contacts of charging relay 72 are welded.

[0057] CPU 110 determines whether the welding diagnosis in step S123 has failed or whether welding has occurred (step S124). If it has been determined that there is no welding (NO in step S124) or if it has been determined that the welding diagnosis has failed, CPU 110 executes charge / discharge switching control (for example, sequence control for switching between charge / discharge between vehicle 10 and DC power supply equipment 200) (step S125).

[0058] If it is determined that the contacts of the charging relays 71, 72 are welded (YES in step S124), the CPU 110 executes a process for the welded state (for example, a process for displaying on the display device 60 that the contacts of the charging relays 71, 72 are welded and a process for stopping predetermined functions such as the driving function of the vehicle 10) (step S126). After step S126, the CPU 110 ends the charge / discharge control process.

[0059] If it is determined that there is an instruction to resume charging / discharging (YES in step S111), CPU 110 determines whether or not the immediately preceding welding diagnosis was unsuccessful (step S131) ​​using the diagnosis results stored in memory 120. If it is determined that the welding diagnosis was not unsuccessful (NO in step S131), CPU 110 advances the process to be executed to the process of step S113 described above.

[0060] If it is determined that the welding diagnosis has failed (YES in step S131), the CPU 110 performs the transmission and reception of signals before the insulation diagnosis as described above as a sequence for charging and discharging between the DC power supply equipment 200 and the vehicle 10, and also performs a welding diagnosis of the charging relays 71, 72 during the waiting period for the signal transmission and reception (step S132).

[0061] 3 is a flowchart showing a flow of a signal transmission / reception welding diagnosis process executed by the ECU 100 of the vehicle 10 in this embodiment. Referring to FIG 3, this process is executed in step S132 of the charge / discharge control process in FIG 2.

[0062] First, the CPU 110 of the ECU 100 of the vehicle 10 receives a CDC signal from the DC power supply equipment 200 (step S132A). After receiving the CDC signal, the CPU 110 waits for a time t1 to transmit a BDC signal, and executes a welding diagnosis of the charging relays 71, 72 during the waiting period (step S132B). The waiting period t1 until the transmission of the BDC signal is a time that is predetermined in the sequence (in this case, the sequence of the GB / T V2G standard). When the time t1 has elapsed, the CPU 110 temporarily suspends the welding diagnosis even if the welding diagnosis has not ended, and outputs the BDC signal to the DC power supply equipment 200 (step S132C).

[0063] Next, the CPU 110 receives a CHM signal from the DC power supply equipment 200 (step S132D). After receiving the CHM signal, the CPU 110 waits for a time t2 to transmit a BHM signal, and if the welding diagnosis of the charging relays 71, 72 has been suspended during the waiting period, the CPU 110 continues the welding diagnosis (step S132E). The waiting period t2 until the transmission of the BHM signal is a time that is predetermined in the sequence (in this case, the sequence of the GB / T V2G standard). After the time t2 has elapsed, the CPU 110 outputs the BHM signal to the DC power supply equipment 200 (step S132F). Note that the time required for the welding diagnosis is less than the time t1+t2. After step S132F, the CPU 110 returns the process to be executed to the charge / discharge control process of FIG. 2.

[0064] Returning to Fig. 2, CPU 110 judges whether welding has been determined in the welding diagnosis of step S132 (step S133). If it is determined that welding has not occurred (NO in step S133), CPU 110 executes the above-mentioned processing of step S114 and thereafter. If it is determined that welding has occurred (YES in step S133), CPU 110 executes the above-mentioned processing of step S126 and thereafter.

[0065] If it is determined that there is no instruction to switch between charging and discharging (NO in step S121), or after step S125, CPU 110 determines whether or not there is an instruction to end charging and discharging from DC power supply equipment 200 (step S141). If it is determined that there is an instruction to end charging and discharging (YES in step S141), CPU 110 stops charging and discharging (step S142) and performs a welding diagnosis of charging relays 71, 72, similar to the above-mentioned step S123 (step S143).

[0066] CPU 110 judges whether welding has been determined in the welding diagnosis of step S143 (step S144). If it is determined that welding has not occurred (NO in step S124) or if it is determined that there is no instruction to end charging / discharging (NO in step S141), CPU 110 returns the process to be executed to the upper process that called this charging / discharging control process. If it is determined that welding has occurred (YES in step S144), CPU 110 executes the processes from step S126 onwards.

[0067] [Second embodiment] In the above-described first embodiment, an embodiment has been described in V2G, which is a bidirectional power exchange between the power storage device 11 of the vehicle 10 and the power grid 400. In the second embodiment, an embodiment in which power is supplied in one direction from the power grid 400 to the power storage device 11 of the vehicle 10 will be described.

[0068] 4 is a flowchart showing the flow of a charging control process executed by the ECU 100 of the vehicle 10 in the second embodiment. This charging control process is called by the ECU 100 from a higher-level process at predetermined intervals and executed.

[0069] Referring to FIG. 4, in a VPP, an aggregator server that bundles a plurality of energy resources issues an instruction to a control device (here, control device 230 of DC power supply equipment 200) of each energy resource (here, power storage device 11 of vehicle 10) to supply power between the energy resource and an electrical device (here, power system 400). In response to this instruction to supply power, control device 230 of DC power supply equipment 200 cooperates with ECU 100 of vehicle 10 to control the charging of power storage device 11.

[0070] In the charging control process, first, the CPU 110 of the ECU 100 of the vehicle 10 determines whether or not an instruction to start charging in response to an instruction to supply power from the aggregator has been received from the DC power supply equipment 200 (step S151).

[0071] When it is determined that there is an instruction to start charging (YES in step S151), CPU 110 determines whether or not the previous welding diagnosis was unsuccessful (step S152) by using the diagnosis result stored in memory 120. When it is determined that the welding diagnosis was not unsuccessful (NO in step S152), CPU 110 transmits and receives a signal before the insulation diagnosis between DC power supply equipment 200 and vehicle 10 as a sequence for charging, similar to step S113 in FIG. 2 (step S153).

[0072] After transmitting and receiving the signal before the insulation diagnosis, CPU 110 executes insulation diagnosis of the power line for charging and discharging, similarly to step S114 in FIG. 2 (step S154).

[0073] When it is determined in the insulation diagnosis that the insulation is maintained, the CPU 110 executes control of charging in cooperation with the control device 230 of the DC power supply equipment 200 (step S155).

[0074] If it is determined that the welding diagnosis has failed (YES in step S152), CPU 110 performs the transmission and reception of signals before the insulation diagnosis as described above as a sequence for charging between DC power supply equipment 200 and vehicle 10, as in step S115 of FIG. 2, and also performs a welding diagnosis of charging relays 71, 72 during the waiting period for signal transmission and reception (step S162).

[0075] CPU 110 determines whether welding has been determined in the welding diagnosis of step S162 (step S163). If it is determined that welding has not occurred (NO in step S163), CPU 110 executes the above-described processing of step S154 and subsequent steps. If it is determined that welding has occurred (YES in step S163), CPU 110 executes a welding process (for example, a process of displaying on display device 60 that the contacts of charging relays 71, 72 are welded and a process of stopping predetermined functions such as the driving function of vehicle 10) similarly to step S126 in FIG. 2 (step S166). After step S166, CPU 110 ends this charging control process.

[0076] If it is determined that there is no instruction to start charging (NO in step S151), or after step S155, CPU 110 determines whether or not there is an instruction to end charging / discharging from DC power supply equipment 200 (step S171). If it is determined that there is an instruction to end charging / discharging (YES in step S171), CPU 110 stops charging / discharging (step S172), and performs a welding diagnosis of charging relays 71, 72, similar to step S123 in Fig. 2, and stores the execution result of the welding diagnosis in memory 120 (step S173).

[0077] CPU 110 judges whether the welding diagnosis in step S173 has failed or whether welding has occurred (step S174). If it has judged that there is no welding (NO in step S174) or that there is no instruction to end charging / discharging (NO in step S171), CPU 110 returns the process to be executed to the upper process that called this charging control process. If it has judged that there is welding (YES in step S174), CPU 110 executes the processes from step S166 onwards.

[0078] [Variations] (1) In the embodiment described above, the processes of the steps shown in Figures 2 to 4 are executed as software by the CPU 110 of the ECU 100 of the vehicle 10. However, this is not limited thereto, and at least a part of the processes of the steps shown in Figures 2 to 4 may be executed by hardware provided in the vehicle 10.

[0079] (2) In the embodiment described above, the DC power supply facility 200 is a charger / discharger as shown in Fig. 1. However, the present invention is not limited to this, and the charger / discharger may be another device, for example, an AC power supply facility, a rapid charger / discharger, a normal charger / discharger, or an on-board charging cable.

[0080] (3) In the above-described embodiment, the sequence for charging and discharging between a charger / discharger such as DC power supply equipment 200 and vehicle 10 is a sequence of the GB / T V2G standard, as shown in Fig. 3. However, the sequence for charging and discharging is not limited to this, and may be a sequence of a standard other than GB / T V2G, a sequence of another standard (for example, the CHAdeMO standard, etc.), or a sequence unique to the manufacturer of vehicle 10 or a charger / discharger such as DC power supply equipment 200.

[0081] (4) In the embodiment described above, all of the processes shown in Fig. 2 and Fig. 4 are executed by the ECU 100 of the vehicle 10. However, this is not limited thereto, and at least a part of the processes shown in Fig. 4 and Fig. 4 may be executed by the control device 230 of the DC power supply equipment 200.

[0082] (5) In the embodiment described above, a welding diagnosis of the charging relays 71, 72 is executed during a standby period during communication, such as the waiting time for signal transmission and reception before an insulation diagnosis, as shown in step S132 in Fig. 2. However, the present invention is not limited to this, and the welding diagnosis may be executed before an insulation diagnosis, and may be executed during a period after communication, such as signal transmission and reception before an insulation diagnosis, and before an insulation diagnosis, or during a period obtained by delaying either signal transmission or reception before an insulation diagnosis.

[0083] (6) The above-described embodiments can be understood as disclosure of a charger or charger such as vehicle 10, DC power supply equipment 200, or charging / discharging system 1, or as disclosure of a control device such as ECU 100 of vehicle 10 or control device 230 of DC power supply equipment 200, or as disclosure of a control method or control program executed by these control devices.

[0084] [summary] (1) As shown in step S113 of Fig. 2, vehicle 10 is a vehicle that charges or discharges in accordance with a sequence that can ensure a waiting period before insulation diagnosis after communication for starting charging or discharging. As shown in Fig. 1, vehicle 10 includes power storage device 11 that can charge and discharge electric power, charging relays 71, 72 that switch between opening and closing contacts that connect or disconnect an electric path between DC power supply equipment 200 and power storage device 11, and ECU 100 that controls charging and discharging of power storage device 11 and charging relays 71, 72. As shown in Figures 2 and 4, ECU 100 performs a contact welding diagnosis after controlling the contacts of charging relays 71, 72 to be open (for example, step S123 in Figure 2, step S173 in Figure 4), and determines whether the welding diagnosis has ended normally (for example, step S124 in Figure 2, step S174 in Figure 4). When controlling the contacts to be closed, if it determines that the welding diagnosis has not ended normally, then it performs a welding diagnosis during a standby period (for example, steps S131 and S132 in Figure 2, steps S152 and S162 in Figure 4).

[0085] As a result, if the contact welding diagnosis is not completed normally after the contacts of the charging relays 71, 72 are controlled to be open, the welding diagnosis is executed during the waiting period before the insulation diagnosis after the communication for starting charging or discharging. As a result, the welding diagnosis can be executed appropriately when the charging or discharging sequence is repeated without the intervention of the user.

[0086] (2) As shown in Fig. 2 and Fig. 4, ECU 100 executes an insulation diagnosis after executing a welding diagnosis in a standby period (for example, if it is determined in step S133 of Fig. 2 that there is no welding, an insulation diagnosis is executed in step S114. If it is determined in step S163 of Fig. 4 that there is no welding, an insulation diagnosis is executed in step S154.) This makes it possible to prevent an insulation diagnosis from being executed before the welding diagnosis is completed.

[0087] (3) As shown in Fig. 1, ECU 100 includes memory 120. As shown in Fig. 2 and Fig. 4, the execution result of the welding diagnosis is stored in memory 120 (for example, step S123 in Fig. 2 and step S173 in Fig. 4), and the execution result stored in memory 120 is used to determine whether or not the welding diagnosis has been normally completed (for example, step S131 in Fig. 2 and step S152 in Fig. 4). This makes it possible to appropriately determine whether or not the welding diagnosis has been normally completed.

[0088] 2 and 4, ECU 100 stores in memory 120, as a result of execution of the welding diagnosis, information indicating that the contacts are welded, information indicating that the contacts are not welded, or information indicating that the welding diagnosis did not end normally (for example, step S123 in FIG. 2 and step S173 in FIG. 4). This makes it possible to appropriately determine whether or not the welding diagnosis ended normally using the execution result of the welding diagnosis.

[0089] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present disclosure is defined by the claims, not by the description of the embodiments described above, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0090] 1 Charging and discharging system, 10 vehicle, 11 power storage device, 15 monitoring unit, 16, 80 voltage sensor, 17 current sensor, 18 temperature sensor, 21, 22 SMR, 30 PCU, 40 MG, 50 power transmission gear, 55 drive wheel, 60 display device, 71, 72 charging relay, 90 inlet, 100 ECU, 110 CPU, 120 memory, 130, 220 communication device, 200 DC power supply equipment, 230 control device, 240 charging start switch, 250 charging stop switch, 260 leakage current detector, 300 charging cable, 310 connector, 400 power system.

Claims

1. A vehicle that charges or discharges according to a sequence that can ensure a waiting period before an insulation diagnosis after communication for starting charging or discharging, The vehicle is A power storage device capable of charging and discharging electric power; a relay that switches between opening and closing a contact that connects or breaks an electric path between an external device and the power storage device; a control device for controlling charging and discharging of the power storage device and the relay; The control device includes: After controlling the contact of the relay to be open, a welding diagnosis of the contact is performed; determining whether the welding diagnosis has been completed normally; When it is determined that the welding diagnosis has not ended normally when controlling the contacts to be closed, the welding diagnosis is executed during the waiting period.

2. The control device includes: The vehicle according to claim 1 , wherein the insulation diagnosis is performed after the welding diagnosis is performed during the waiting period.

3. The control device includes a memory. The control device includes: storing the execution result of the welding diagnosis in the memory; 3. The vehicle according to claim 1, wherein the execution result stored in the memory is used to determine whether the welding diagnosis has been normally completed.

4. 4. The vehicle according to claim 3, wherein the control device stores in the memory, as a result of execution of the welding diagnosis, information indicating a result that the contacts are welded, information indicating a result that the contacts are not welded, or information indicating a result that the welding diagnosis did not end normally.

5. A control device for a vehicle that charges or discharges according to a sequence that can ensure a waiting period before an insulation diagnosis after communication for starting charging or discharging, The vehicle is A power storage device capable of charging and discharging electric power; a relay that switches between opening and closing a contact that connects or breaks an electric path between an external device and the power storage device, The control device includes: Controlling charging and discharging of the power storage device and the relay; After controlling the contact of the relay to be open, a welding diagnosis of the contact is performed; determining whether the welding diagnosis has been completed normally; A vehicle control device that, when controlling the contacts to be closed, determines that the welding diagnosis has not ended normally, executes the welding diagnosis during the standby period.

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