JP2019122062A - Electric vehicle - Google Patents

Abstract

To enable traveling even when disconnection abnormality occurs in a connection line.SOLUTION: When a vehicle is started up, when it is diagnosed so that, a charging relay is deposited by deposition diagnosis of a charging relay when finishing charging of a power storage unit, traveling of a vehicle is restricted. When deposition diagnosis of the charging relay is not executed when finishing charging of the power storage unit, a request is performed to connect an external side connection part to a vehicle side connection part, then connection of the vehicle side connection part and external side connection part is confirmed and then the deposition diagnosis of the charging relay is performed. In charging of the power storage unit, even when connection between the vehicle side connection part and the external side connection part cannot be confirmed by a connection line, if communication with an external part direct current power supply is possible by a communication line, the deposition diagnosis of the charging relay is performed and then charging of the power storage unit is finished.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electrically powered vehicle, and more particularly to an electrically powered vehicle that is connected to an onboard power storage device and an external DC power supply device to perform external charging.

  Conventionally, as an electrically powered vehicle of this type, there is a connection between a connection connector and a storage device in a state in which a connection cable connected to a charging cable of a DC power supply external to the vehicle is connected after the charging by the DC power supply ends. What performs welding diagnosis of the 1st charge relay and the 2nd charge relay which accept connection of is proposed (for example, refer to patent documents 1). In this vehicle, welding diagnosis of only one of the first charging relay and the second charging relay is performed while the vehicle is traveling.

JP, 2013-188068, A

  The above-mentioned vehicle is provided with a connection line for confirming the connection between the connection connector and the charging cable, and is charged with communication with the vehicle side and the external DC power supply side, and connected based on the signal from the connection line during charging. It is determined whether the connector and the charging cable are connected. When charging is finished with the connector connected to the charging cable, welding diagnosis of the charging relay is performed. When it is determined that the connection connector is not connected to the charging cable, the system main relay is turned off so as to immediately disconnect the power storage device mounted on the vehicle in order to prevent an electric shock or the like. Even when a disconnection abnormality occurs in the connection line during charging, it is determined that the connection connector is not connected to the charging cable, so the system main relay is turned off so as to immediately disconnect the power storage device mounted on the vehicle. In such a vehicle, when it is determined that charging is completed without performing welding diagnosis of the charging relay at startup, it may be required to connect the charging cable to the connection connector in order to perform welding diagnosis of the charging relay. In this case, when it is determined that the charging cable is not connected to the connection connector during charging, it is requested to connect the charging cable to the connection connector at the time of start-up, and it takes time to start the vehicle. Moreover, when the disconnection abnormality has arisen in the connection line, since welding diagnosis can not be performed, the case where it can not drive | work arises.

  The main object of the electric vehicle of the present invention is to enable traveling even when a disconnection abnormality occurs in the connection line.

  The electric vehicle of the present invention adopts the following means in order to achieve the above-mentioned main object.

The electric vehicle of the present invention is
A storage device,
An electric motor that outputs power by power supplied from the storage device to a power line;
A system main relay for connecting and disconnecting the storage device to the power line;
A vehicle-side connection portion attached to a charging line connected to the motor side from the system main relay of the power line and connected to an external-side connection portion of an external DC power supply device;
A charging relay attached to the charging line;
A communication line connected to the external DC power supply device via the vehicle side connection portion and the external side connection portion;
A connection line for confirming that the outside connection part is connected to the vehicle connection part;
A control device that controls the system main relay and the charging relay, and controls the charging of the power storage device by the power from the external DC power supply device while communicating with the external DC power supply device;
An electric vehicle comprising
The controller is
If the connection between the vehicle-side connection unit and the external connection unit can not be confirmed during charging of the storage device, the system main relay is immediately turned off to end charging of the storage device.
When charging of the power storage device is finished in a state where connection between the vehicle side connection portion and the external side connection portion is confirmed, welding diagnosis of the charging relay is performed with the system main relay turned on. After that, the system main relay is turned off to complete the end of charging of the storage device,
When starting up the vehicle, when it is determined that the charging relay is welded by welding diagnosis of the charging relay at the time of ending charging of the power storage device, travel of the vehicle is restricted;
When starting the vehicle, when the welding diagnosis of the charging relay is not executed when the charging of the power storage device is finished, the vehicle side connecting portion is requested to connect the external side connecting portion, and Check the connection between the vehicle-side connection and the outside connection, and prohibit travel when the connection between the vehicle-side connection and the outside connection can not be confirmed, and the vehicle-side connection and the outside connection When the connection with the unit has been confirmed, welding diagnosis of the charging relay is performed and when it is diagnosed that welding is performed, the travel of the vehicle is limited.
Furthermore,
The control device can communicate with the external DC power supply device through the communication line even when the connection between the vehicle-side connection portion and the external connection portion can not be confirmed by the connection line during charging of the storage device. If this is the case, the welding diagnosis of the charging relay is performed and then the charging of the power storage device is ended.
It is characterized by

  In the electrically powered vehicle of the present invention, a storage device, an electric motor outputting power by the power supplied from the storage device to the electric power line, a system main relay for connecting and releasing the connection of the storage device to the power line, external DC A vehicle-side connection connected to the external connection of the power supply device, a charging relay, a communication line connected to the external DC power supply via the vehicle-side connection and the external connection, a vehicle-side connection And a connection line for confirming that the external connection unit is connected to the unit. The vehicle side connection part is attached to the charge line connected to the electric motor side from the system main relay of an electric power line. A charging relay is attached to the charging line.

  According to the electric vehicle of the present invention, when it is not possible to confirm the connection between the vehicle side connection portion and the external side connection portion during charging of the power storage device, the system main relay is immediately turned off and charging of the power storage device is ended. As a result, it is possible to suppress the inconvenience (such as electric shock) due to the system main relay being turned on. In addition, when charging of the power storage device is completed in a state where the connection between the vehicle side connection portion and the external side connection portion is confirmed, the welding diagnosis of the charging relay is performed with the system main relay turned on. The system main relay is turned off to complete the termination of charging of the power storage device. As a result, the processing for the presence or absence of welding of the charging relay can be made quick at the next startup of the vehicle.

  The electric vehicle according to the present invention restricts the traveling of the vehicle when it is diagnosed that the charging relay is welded by the welding diagnosis of the charging relay when the charging of the power storage device is finished when the vehicle is started. As a limitation of traveling of the vehicle, for example, traveling is permitted under the condition that the vehicle side connection portion is in a closed state when only one of the positive and negative relays of the charging relay is welded, for charging When both the positive electrode side and the negative electrode side of the relay are welded, it is possible to consider one that prohibits traveling. Further, the electric vehicle of the present invention connects the external connection portion to the vehicle-side connection portion when the welding diagnosis of the charging relay is not executed when the charging of the power storage device is finished when starting the vehicle. Ask. Then, the connection between the vehicle-side connection portion and the outside-side connection portion is confirmed, and the traveling is prohibited when the connection between the vehicle-side connection portion and the outside-side connection portion can not be confirmed. Thereby, the inconvenience (electric shock etc.) that the charging relay is welded can be suppressed. On the other hand, when the connection between the vehicle side connection portion and the external side connection portion can be confirmed, welding diagnosis of the charging relay is performed, and when it is determined that welding is performed, travel of the vehicle is limited. Thereby, the welding diagnosis of the charging relay can be performed more reliably, and the inconvenience (electric shock or the like) of the welding of the charging relay can be suppressed.

  Furthermore, the electric vehicle of the present invention can communicate with the external DC power supply device through the communication line even when the connection between the vehicle side connection and the external connection through the connection line can not be confirmed during charging of the storage device. After the welding diagnosis of the charging relay is performed, the charging of the power storage device is ended. As a result, even when the disconnection of the connection line is abnormal, the traveling permission or the traveling restriction can be performed without performing the welding diagnosis of the charging relay at the time of starting the next vehicle. As a result, traveling can be enabled even when a disconnection abnormality occurs in the connection line.

  Here, even when the connection between the vehicle-side connection unit and the outside connection unit can not be confirmed by the connection line, if communication with the external DC power supply device is possible by the communication line, immediately perform welding diagnosis of the charging relay to charge it. It may be finished, or it may wait for the charging to be completed, perform welding diagnosis of the charging relay, and end the charging.

It is a block diagram which shows the outline of a structure of the electric vehicle 20 as one Example of this invention. 5 is a flowchart showing an example of a charging end welding diagnosis processing routine executed by the electronic control unit 70. FIG. 5 is a flowchart showing an example of a start-up welding diagnosis processing routine executed by the electronic control unit 70;

  Next, modes for carrying out the present invention will be described using examples.

  FIG. 1 is a block diagram schematically showing the configuration of an electric vehicle 20 as an embodiment of the present invention. As illustrated, the electric vehicle 20 of the embodiment has a motor 32, an inverter 34, a battery 36, a boost converter 40, a high voltage side power line 42, a low voltage side power line 44, and a system main relay 38. , A charging power line 50, a vehicle-side inlet 54, and an electronic control unit 70.

  The motor 32 is configured as a synchronous generator motor, and includes a rotor in which permanent magnets are embedded, and a stator in which a three-phase coil is wound. The rotor of the motor 32 is connected to a drive shaft 26 connected to drive wheels 22 a and 22 b via a differential gear 24.

  The inverter 34 is connected to the motor 32 and to the high voltage side power line 42. The inverter 34 is configured as a known inverter circuit having six transistors and six diodes.

  The battery 36 is configured as, for example, a lithium ion secondary battery or a nickel hydrogen secondary battery, and is connected to the low voltage side power line 44.

  The boost converter 40 is connected to the high voltage side power line 42 and the low voltage side power line 44, and is configured as a known buck-boost converter circuit having two transistors, two diodes, and a reactor. There is.

  A high voltage side capacitor 46 is connected to a positive electrode bus and a negative electrode bus of the high voltage side power line 42, and a low voltage side capacitor 48 is attached to a positive electrode bus and a negative electrode bus of the low voltage side power line 44. There is. A system main relay 38 is attached to the low voltage side power line 44. The system main relay 38 includes a positive side relay SMRB provided on a positive side bus of the low voltage side power line 44, a negative side relay SMRG provided on a negative side bus of the low voltage side power line 44, and a negative side relay SMRG. It has a precharging circuit in which a precharging resistor R and a precharging relay SMRP are connected in series so as to bypass.

  One end of the charging power line 50 is connected to the boost converter 40 side (motor 32 side) than the system main relay 38 of the low voltage side power line 44, and the other end is connected to the vehicle side inlet 54. A charging relay 52 is attached to the charging power line 50. The charging relay 52 has a positive electrode side relay DCRB provided on the positive electrode side line of the charging power line 50 and a negative electrode side relay DCRB provided on the negative electrode side line of the charging power line 50. The charging power line 50 is connected to the external charging power line 150 from the external DC power supply 120 by connecting the external connector 154 of the external DC power supply 120 to the vehicle-side inlet 54. Although not shown, the external DC power supply device 120 is connected to an external commercial power supply, converts power from the commercial power supply into DC power, and supplies the DC power from the external charging power line 150.

  When the external connector 154 is connected to the vehicle-side inlet 54, the connection line 58 is connected to the external connection line 158 of the external DC power supply device 120 via the external connector 154, and via the external connector 154. A communication line 60 connected to the external communication line 160 connected to the external DC power supply 120 is connected.

  The electronic control unit 70 is configured as a microprocessor centering on the CPU 72, and in addition to the CPU 72, a ROM 74 for storing processing programs, a RAM 76 for temporarily storing data, a flash memory (not shown), an input / output port not shown And a communication port not shown.

  Signals from various sensors are input to the electronic control unit 70 through input ports. As a signal input to the electronic control unit 70, for example, a rotational position θm from a rotational position detection sensor (for example, resolver) 32a for detecting a rotational position of the rotor of the motor 32 and a voltage attached between terminals of the battery 36 The voltage VB from the sensor 36a and the current IB from the current sensor 36b attached to the output terminal of the battery 36 can be mentioned. In addition, voltage VH of high voltage side capacitor 46 (high voltage side power line 42) from voltage sensor 46a attached between terminals of high voltage side capacitor 46, voltage sensor attached between terminals of low voltage side capacitor 48 The voltage VL of the low voltage side capacitor 48 (low voltage side power line 44) from 48a can also be mentioned. Further, the charging voltage Vchg from the voltage sensor 50a attached to the charging power line 50 is also input. Further, a connection line 58 connected to the vehicle-side inlet 54 and a lid signal line 62 from the lid sensor 56 attached to the vehicle-side inlet 54 are connected to the input port of the electronic control unit 70. In addition, since the electronic control unit 70 also functions as a drive control device of a vehicle, information necessary for travel control is also input. As such information, although not shown, for example, an ignition signal from an ignition switch, a shift position from a shift position sensor that detects an operation position of a shift lever, and an accelerator pedal position sensor that detects a depression amount of an accelerator pedal. The accelerator opening degree, the brake pedal position from the brake pedal position sensor that detects the depression amount of the brake pedal, the vehicle speed from the vehicle speed sensor, and the like can be mentioned.

  Various control signals are outputted from the electronic control unit 70 through the output port. As a signal output from the electronic control unit 70, for example, a switching control signal to a transistor of the inverter 34, a switching control signal to a transistor of the boost converter 40, a drive control signal to the system main relay 38, a charging relay 52 Drive control signals and the like.

  The electronic control unit 70 communicates with the external DC power supply 120 by connecting the communication line 60 connected to the communication port to the external communication line 160.

  Next, the operation of the electric vehicle 20 of the embodiment thus configured, particularly welding of the charging relay 52 by charging the battery 36 using power from the external DC power supply 120 (hereinafter simply referred to as "external charging") The operation will be described when making a diagnosis. FIG. 2 is a flow chart showing an example of a charging end welding diagnosis processing routine executed by the electronic control unit 70, and FIG. 3 is a flow chart showing an example of a startup welding diagnosis processing routine executed by the electronic control unit 70. It is. The end-of-charge welding diagnosis processing routine of FIG. 2 is executed when the external connector 154 is connected to the vehicle-side inlet 54 and external charging is completed. The start-up welding diagnosis processing routine of FIG. 3 is executed when the system of the vehicle is started. The following will be described in order.

  When the welding completion welding diagnosis processing routine of FIG. 2 is executed, the electronic control unit 70 first confirms the connection between the vehicle-side inlet 54 and the external connector 154 by the connection line 58 (step S100). When the connection between the vehicle-side inlet 54 and the external connector 154 by the connection line 58 is confirmed, it is determined whether the external charging is completed (step S110). For this termination determination, for example, it is determined that external charging is terminated when an operation for termination of charging is performed by the operator when the preset charging time has elapsed, or when the battery 36 has reached full charging. It can be done by When it is determined that the external charging is not completed, the process returns to the process of confirming the connection between the vehicle-side inlet 54 and the external connector 154 by the connection line 58 in step S100, and the external charging is continued. Therefore, while the confirmation of the connection between the vehicle-side inlet 54 and the external connector 154 by the connection line 58 is continued, the external charging is continued until it is determined that the external charging is completed.

  If it is determined in step S110 that the external charging is completed, the external charging ending process is performed (step S120), and welding diagnosis of the charging relay 52 is performed (step S130). The termination processing of the external charging can include, for example, communication of termination of charging to the external DC power supply device 120, and the like. The welding diagnosis of the charging relay 52 can be performed, for example, based on the change in the voltage of the charging power line 50 detected by the voltage sensor 50a when the positive side relay DCRB and the negative side relay DCRB are turned on and off. It is determined whether the result of the welding diagnosis is welding (step S140), and when it is diagnosed that the charging relay 52 is not welded, no welding (normal) is determined (step S150), and the system main relay 38 Is interrupted (step S170), and this routine ends. On the other hand, when it is determined in step S140 that the charging relay 52 is welded, welding (abnormality) is determined (step S160), the system main relay 38 is shut off (step S170), and this routine is ended.

  When the connection between the vehicle-side inlet 54 and the external connector 154 by the connection line 58 is not confirmed in step S100, it is determined whether communication with the external DC power supply device 120 by the communication line 60 is interrupted (step S180) . When it is determined that communication with the external DC power supply device 120 by the communication line 60 is not interrupted, the vehicle-side inlet 54 and the external-side connector 154 are connected, but it is determined that the connection line 58 is broken. Do. In this case, charge termination processing for termination of the external charge is performed (step S120), welding diagnosis of the charging relay 52 is performed (step S130), and the welding 52 is not welded (normal) or welded (abnormal) Then, the system main relay 38 is shut off (step S170), and this routine ends.

  When it is determined in step S180 that communication with the external DC power supply device 120 by the communication line 60 is interrupted, it is determined that the vehicle-side inlet 54 and the external-side connector 154 are not connected, avoiding problems such as electric shock. Therefore, the system main relay 38 is immediately shut off (step S190), welding diagnosis non-execution of the charging relay 52 is recorded (step S200), and this routine is ended. The welding diagnosis unexecuted recording of the charging relay 52 can be performed, for example, by writing to a predetermined address of a flash memory (not shown) of the electronic control unit 70.

  Next, welding diagnosis of the charging relay 52 at the time of startup will be described using the startup time welding diagnosis processing routine of FIG. 3. When the start-up welding diagnosis processing routine is executed, the electronic control unit 70 first confirms the welding diagnosis at the end of the external charge (step S300). Confirmation of welding diagnosis at the end of external charging is either confirmation of non-welding (normality) of charging relay 52, confirmation of welding (abnormality) of charging relay 52, or non-execution of welding diagnosis of charging relay 52. It is confirmation of existence. In the welding diagnosis at the end of the external charging, when the charging relay 52 is determined not to be welded (normal), the traveling is permitted (step S310), and this routine is ended. On the other hand, in step S300, in the welding diagnosis at the end of the external charging, when the charging relay 52 is determined to be welding (abnormal), travel restriction is imposed (step S320), and this routine is ended. When only one of the positive side relay DCRB and the negative side relay DCRB of the charging relay 52 is welded, the charging lid is closed by the lid signal from the lid sensor 56 via the lid signal line 62 as travel limitation. Allows travel when the charging lid is open and prohibits travel when the charging lid is open. In addition, when both the positive electrode side relay DCRB and the negative electrode side relay DCRB of the charging relay 52 are welded, traveling is prohibited.

  If it is determined in step S300 that welding diagnosis at the end of external charging has not been performed, a request to connect the external connector 154 to the vehicle-side inlet 54 is made (step S330). Subsequently, it is determined whether or not the connection between the vehicle-side inlet 54 and the external connector 154 by the connection line 58 has been made within a predetermined time after the request to connect the external connector 154 to the vehicle-side inlet 54 is made. It confirms (step S340). Here, as the predetermined time, a time (for example, 5 seconds or 10 seconds) sufficient to connect the vehicle-side inlet 54 and the external-side connector 154 after the request is made can be used. If the connection between the vehicle-side inlet 54 and the external connector 154 by the connection line 58 can not be confirmed within a predetermined time, traveling is prohibited (step S350), and the present routine is ended. When the connection between the vehicle-side inlet 54 and the external connector 154 by the connection line 58 can be confirmed within a predetermined time, welding diagnosis of the charging relay 52 is performed (steps S360 and S370), and the charging relay 52 is not welded. If it is determined that (normal) is determined, traveling is permitted (step S380), and this routine ends. If it is determined that the charging relay 52 is welded (abnormal), travel restriction is imposed (step S320), and this routine is ended. The travel restriction in this case is the same as when it is determined in step S300 that the charging relay 52 is determined to be welded (abnormal).

  In the electric vehicle 20 according to the embodiment described above, when the connection between the vehicle-side inlet 54 and the external-side connector 154 can not be confirmed during the external charging of the battery 36, the system main relay 38 is turned off immediately to end the charging of the battery 36. . As a result, it is possible to suppress the inconvenience (such as electric shock) due to the system main relay 38 being turned on. Also, when the external charging of the battery 36 is ended in a state where the connection between the vehicle side inlet 54 and the external side connector 154 is confirmed, the welding diagnosis of the charging relay 52 is performed with the system main relay 38 turned on. After that, the system main relay 38 is turned off to complete the end of charging of the battery 36. As a result, the processing for the presence or absence of welding of the charging relay 52 can be made quick at the next startup of the vehicle.

  In the electric vehicle 20 of the embodiment, when the system activation of the vehicle is performed, if welding (abnormality) of the charging relay 52 is determined by welding diagnosis of the charging relay 52 when the external charging of the battery 36 is finished, the vehicle Limit travel. As a result, traveling can be performed according to the degree of welding of the charging relay 52.

  The electric vehicle 20 according to the embodiment connects the external connector 154 to the vehicle-side inlet 54 when the welding diagnosis of the charging relay 62 is not performed when the charging of the battery 36 is finished when the system is started. I request it. Then, the connection between the vehicle-side inlet 54 and the external connector 154 is confirmed, and the travel is prohibited when the connection between the vehicle-side inlet 54 and the external connector 154 can not be confirmed. Thereby, the inconvenience (electric shock etc.) that welding relay 52 is welded can be suppressed. On the other hand, when the connection between the vehicle inlet 54 and the external connector 154 is confirmed, welding diagnosis of the charging relay 52 is performed. Thereby, welding diagnosis of the charging relay 52 can be performed more reliably. Then, when it is determined by the welding diagnosis that the charging relay 52 is welded, the travel of the vehicle is limited. Thereby, the inconvenience (electric shock etc.) that welding relay 52 is welded can be suppressed.

  The electric vehicle 20 of the embodiment communicates with the external DC power supply device 20 through the communication line 60 even when the connection between the vehicle-side inlet 54 and the external connector 154 can not be confirmed by the connection line 58 during the external charging of the battery 36. If not interrupted, welding diagnosis of the charging relay 52 is performed and then external charging of the battery 36 is ended. As a result, even when the disconnection of the connection line 58 is abnormal, the traveling permission or the traveling restriction can be performed without performing the welding diagnosis of the charging relay 52 when the system of the next vehicle is started. As a result, traveling can be enabled even when a disconnection abnormality occurs in the connection line 58.

  In the electric vehicle 20 of the embodiment, when it is determined that the communication with the external DC power supply device 120 by the communication line 60 is not interrupted even when the connection between the vehicle-side inlet 54 and the external connector 154 can not be confirmed by the connection line 58 The welding diagnosis of the charging relay 52 is immediately performed, and external charging is finished. However, it is also possible to wait for the completion of the external charging, perform welding diagnosis of the charging relay 52, and end the external charging.

  In the electric vehicle 20 of the embodiment, the battery 36 is used as the power storage device, but any device capable of storing power may be used, and a capacitor or the like may be used.

  In the embodiment, the form of the electric vehicle 20 provided with the motor 32 is used. However, a hybrid vehicle may also be provided that includes an engine in addition to the motor 32.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the section of "Means for Solving the Problems" will be described. In the embodiment, the battery 36 corresponds to a "power storage device", the motor 32 corresponds to a "motor", the system main relay 38 corresponds to a "system main relay", and the vehicle side inlet 54 is a "vehicle side connection portion" The charging relay 52 corresponds to a "charging relay", the communication line 60 corresponds to a "communication line", the connection line 58 corresponds to a "connection line", and the electronic control unit 70 is a "control device." Equivalent to

  In addition, the correspondence of the main elements of the embodiment and the main elements of the invention described in the section of the means for solving the problem implements the invention described in the column of the means for solving the problem in the example. The present invention is not limited to the elements of the invention described in the section of “Means for Solving the Problems”, as it is an example for specifically explaining the mode for carrying out the invention. That is, the interpretation of the invention described in the section of the means for solving the problem should be made based on the description of the section, and the embodiment is an embodiment of the invention described in the section of the means for solving the problem. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all by these Examples, In the range which does not deviate from the summary of this invention, it becomes various forms Of course it can be implemented.

  The present invention is applicable to the manufacturing industry of electric vehicles and the like.

  DESCRIPTION OF SYMBOLS 20 electric vehicle, 22a, 22b drive wheel, 24 differential gear, 26 drive shaft, 32 motor, 32a rotational position detection sensor, 32u, 32v, 36b current sensor, 34 inverter, 36 battery, 36a, 46a, 48a voltage sensor, 40 Boost converter, 42 high voltage side power line, 44 low voltage side power line, 46 high voltage side capacitor, 48 low voltage side capacitor, 50 charging power line, 52 charging relay, 54 vehicle side inlet, 56 lid sensor, 58 Connection line, 60 communication line, 62 lid signal line, 70 electronic control unit, 72 CPU, 74 ROM, 76 RAM, 120 external DC power supply unit, 150 external charging power line, 154 external connector, 158 external connection line , 160 External side communication line, DCRB positive relay, DCRG negative relay, resistor for R precharging, SMRB positive relay, SMRG negative relay SMRG, SMRP relay for precharging.

Claims (1)

A storage device,
An electric motor that outputs power by power supplied from the storage device to a power line;
A system main relay for connecting and disconnecting the storage device to the power line;
A vehicle-side connection portion attached to a charging line connected to the motor side from the system main relay of the power line and connected to an external-side connection portion of an external DC power supply device;
A charging relay attached to the charging line;
A communication line connected to the external DC power supply device via the vehicle side connection portion and the external side connection portion;
A connection line for confirming that the outside connection part is connected to the vehicle connection part;
A control device that controls the system main relay and the charging relay, and controls the charging of the power storage device by the power from the external DC power supply device while communicating with the external DC power supply device;
An electric vehicle comprising
The controller is
If the connection between the vehicle-side connection unit and the external connection unit can not be confirmed during charging of the storage device, the system main relay is immediately turned off to end charging of the storage device.
When charging of the power storage device is finished in a state where connection between the vehicle side connection portion and the external side connection portion is confirmed, welding diagnosis of the charging relay is performed with the system main relay turned on. After that, the system main relay is turned off to complete the end of charging of the storage device,
When starting up the vehicle, when it is determined that the charging relay is welded by welding diagnosis of the charging relay at the time of ending charging of the power storage device, travel of the vehicle is restricted;
When starting the vehicle, when the welding diagnosis of the charging relay is not executed when the charging of the power storage device is finished, the vehicle side connecting portion is requested to connect the external side connecting portion, and Check the connection between the vehicle-side connection and the outside connection, and prohibit travel when the connection between the vehicle-side connection and the outside connection can not be confirmed, and the vehicle-side connection and the outside connection When the connection with the unit has been confirmed, welding diagnosis of the charging relay is performed and when it is diagnosed that welding is performed, the travel of the vehicle is limited.
Furthermore,
The control device can communicate with the external DC power supply device through the communication line even when the connection between the vehicle-side connection portion and the external connection portion can not be confirmed by the connection line during charging of the storage device. If this is the case, the welding diagnosis of the charging relay is performed and then the charging of the power storage device is ended.
An electric vehicle characterized by

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