JP5104803B2 - Method for detecting closed closure of charging system, charger and relay - Google Patents

Description

  The present invention relates to a charging system for an electric vehicle, and more particularly, to a technique for detecting closed adhesion of a relay between a vehicle-side connector of an electric vehicle and an in-vehicle battery.

  In recent years, development of electric vehicles that can be charged by chargers installed in various places such as parking lots and dedicated charging stands has been progressing. In such an electric vehicle, normally, a relay is disposed on a charging line between the vehicle-side connector to which the charger-side connector of the charger is mounted for charging and the in-vehicle battery. It is devised so that the voltage of the in-vehicle battery is not applied to the terminal of the vehicle-side connector by opening.

  However, although the relay is controlled to open, there are cases where the relay is not opened due to a failure or the like. This phenomenon is called closed adhesion or welding. In Patent Document 1, before both of the relays arranged on the positive electrode side and the negative electrode side line constituting the power line between a load such as a motor and an inverter and the in-vehicle battery are welded, at least one of the relays A relay welding detection device capable of detecting welding is disclosed. This relay welding detection device detects the welding of one relay by controlling the closing of one relay and controlling the opening of the other relay and measuring the input voltage to the load at that time with a voltmeter. Moreover, the welding of the other relay is also detected by replacing the relay to be opened / closed and performing the same process.

JP 2006-310219 A

  It is also possible to apply the relay welding detection device described in Patent Document 1 to detection of closed adhesion of a relay between a vehicle-side connector of an electric vehicle and an in-vehicle battery. However, in this case, the electric vehicle needs to be equipped with a voltmeter that measures the voltage of the charging line between the vehicle-side connector and the relay, in addition to the voltmeter that measures the output voltage of the in-vehicle battery. On the other hand, there is an additional cost for detecting the closed closure of the relay. In addition, the relay open / close control is performed by, for example, an ECU (Electric Control Unit) mounted on the electric vehicle. When the ECU malfunctions and the relay is closed even though charging is not being performed, In addition, the voltage of the in-vehicle battery is applied to the terminal of the vehicle-side connector.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to detect the closed adhering of the relay without incurring additional cost on the electric vehicle side, and to ensure the relay except during charging. It is to provide technology that can be opened.

  In order to solve the above problems, in the present invention, a relay disposed on a charging line between a vehicle-side connector of an electric vehicle and a vehicle-mounted battery is operated by control power supplied from a charger via the vehicle-side connector. Let Prior to the start of charging the in-vehicle battery, the electric vehicle controls the closing of the relay, waits for the in-vehicle battery to be charged by the charging power supplied from the charger via the vehicle-side connector, and charges the in-vehicle battery. After the completion, the relay is controlled to be opened, and the closed contact of the relay is detected based on the measured value of the output voltage of the charging power notified from the charger. On the other hand, the charger starts supplying control power via the charger-side connector attached to the vehicle-side connector prior to the start of charging of the vehicle-mounted battery, and stops supplying power for charging when charging of the vehicle-mounted battery ends. After that, while continuing to supply the control power, the output voltage of the charging power is measured and notified to the electric vehicle.

For example, the present invention is a charging system comprising an electric vehicle and a charger that supplies electric power for charging to an in-vehicle battery of the electric vehicle,
The electric vehicle is
A vehicle-side connector for supplying charging power and control power;
A relay that is disposed on a charging line between the vehicle-side connector and the in-vehicle battery, and operates with the control power; and
Relay control means that operates with an auxiliary battery mounted on the electric vehicle and controls opening and closing of the relay;
Detecting means for detecting closed adhering of the relay;
Vehicle-side communication means for communicating with the charger,
The charger is
A charger-side connector for supplying the charging power and the control power;
Measuring means for measuring the output voltage of the charging power;
Power supply means for supplying the charging power and the control power to the electric vehicle via the charger-side connector attached to the vehicle-side connector;
Charger-side communication means for communicating with the electric vehicle,
The power supply means
Even after stopping charging of the charging power due to the end of charging of the in-vehicle battery, continuing to supply the control power,
The relay control means includes
Prior to starting charging of the in-vehicle battery, the relay is controlled to be closed, and after the charging of the in-vehicle battery is completed, the relay is controlled to be opened,
The measuring means includes
Transmitting the measured value of the output voltage of the charging power to the electric vehicle via the charger-side communication means,
The detection means includes
Based on the measured value of the output voltage of the charging power after completion of charging of the in-vehicle battery received from the electric vehicle via the vehicle-side communication means, the closed closure of the relay is detected.

In such a charging system,
The charger further includes locking means for locking the charger-side connector and the vehicle-side connector prior to the start of charging of the in-vehicle battery, and releasing the lock according to a release operation received from an operator. May be. Here, the detection means transmits a detection result of the closed closure of the relay to the charger via the vehicle-side communication means. The power supply means may be configured to lock the lock means regardless of whether or not the release operation is performed when a detection result received from the electric vehicle via the charger-side communication means indicates that the relay is closed. The lock according to is maintained.

In such a charging system,
The relay includes a first relay disposed on one of a positive electrode side and a negative electrode side line constituting the charging line, and a second relay disposed on the other of the positive electrode side and the negative electrode side line. May be configured.

  In this case, the relay control means controls the closing of the first and second relays prior to the start of charging of the in-vehicle battery, and until the first monitoring time elapses after the end of charging of the in-vehicle battery. The first relay is controlled to open and the second relay is kept closed, and then the first relay is controlled to close until the second monitoring time elapses. Open control of the relay.

  In addition, the detecting means may close the first relay based on the output voltage of the charging power measured by the measuring means within the first monitoring time after the end of charging of the in-vehicle battery. And detecting closed closure of the second relay based on the output voltage of the charging power measured by the measuring means within the second monitoring time after the first monitoring time has elapsed. .

  The first and second monitoring times may be notified to the electric vehicle via the charger-side communication unit after the power supply unit stops supplying the charging power.

  According to the present invention, it is possible to detect the closed adhesion of the relay without incurring additional costs on the electric vehicle side, and it is possible to reliably open the relay except during charging.

FIG. 1 is a schematic configuration diagram of a charging system for an electric vehicle according to an embodiment of the present invention. FIG. 2 is a flowchart for explaining the charging operation of the electric vehicle charging system shown in FIG. 3A is a diagram showing a first modification of electric vehicle 200 shown in FIG. 1, and FIG. 3B is a diagram showing a second modification of electric vehicle 200 shown in FIG. is there.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a schematic configuration diagram of a charging system for an electric vehicle according to an embodiment of the present invention.

  As illustrated, the charging system according to the present embodiment includes a charger 100 and an electric vehicle 200.

  First, the electric vehicle 200 will be described. The electric vehicle 200 includes a vehicle-side connector 201, an in-vehicle battery 203, an auxiliary battery 204, relays 205A and 205B, a relay control unit 206, a communication unit 207, and a closed adhesion detection unit 208.

  The vehicle-side connector 201 includes terminals for a pair of charging lines (for example, 400V power line) 202A and 202B, a pair of control power lines (for example, 12V power line) 202C and 202D, and a communication line 202E. When a later-described charger-side connector 101 is attached to the vehicle-side connector 201, these terminals abut against corresponding terminals of the later-described charger-side connector 101, respectively. As a result, the pair of charging lines 202A and 202B, the pair of control power lines 202C and 202D, and the communication line 202E correspond to the pair of charging lines 102A and 102B and the pair of control power lines 102C of the charger 100, respectively. , 102D and the communication line 102E.

  The in-vehicle battery 203 is a battery for supplying drive power to a drive system such as a motor or an inverter.

  The auxiliary battery 204 is a battery for supplying control power to a control system such as an ECU (not shown).

  One relay 205A operates with control power supplied from the charger 100 via a pair of control power lines 202C and 202D. The relay 205A is inserted into the positive-side charging line 202A, and is opened or closed under the control of a relay control unit 206 described later to disconnect or connect the positive-side charging line 202A.

  The other relay 205B operates with control power supplied from the charger 100 via a pair of control power lines 202C and 202D. The relay 205B is inserted into the negative charging line 202B, and is opened or closed under the control of a relay control unit 206 described later, thereby disconnecting or connecting the negative charging line 202B.

  The relay control unit 206 operates with control power supplied from the auxiliary battery 204, and controls opening and closing of the relays 205A and 205B. Such a relay control unit 206 is realized as a part of the function of the ECU, for example.

  The communication unit 207 communicates with the charger 100 via the communication line 202E.

  The closed sticking detection unit 208 detects the closed sticking of the relays 205A and 205B based on the measurement value of the output voltage of the charging power sent from the charger 100 via the communication unit 207. The closed sticking detection unit 208 may be realized as a part of the function of the ECU, for example.

  Next, the charger 100 will be described. The charger 100 includes a charger-side connector 101, a charging cable 102, an AC / DC converter 103, an ELB (leakage breaker) 104, a latch unit 105, a communication unit 106, a voltmeter 107, and a main control unit. 108 and a control system power supply 109.

  The charger-side connector 101 includes a pair of charging lines 102A and 102B, a pair of control power lines 102C and 102D, and a communication line 102E. When the charger-side connector 101 is attached to the vehicle-side connector 201, as described above, these terminals come into contact with the corresponding terminals of the vehicle-side connector 201, respectively. As a result, the pair of charging lines 102A and 102B, the pair of control power lines 102C and 102D, and the communication line 102E correspond to the pair of charging lines 202A and 202B and the pair of control power lines 202C of the electric vehicle 200, respectively. , 202D and the communication line 202E.

  The charging cable 102 accommodates a pair of charging lines 102A and 102B, a pair of control power lines 102C and 102D, and a communication line 102E. A charger-side connector 101 is attached to the tip of the charging cable 102.

  The AC / DC converter 103 converts AC power supplied from the AC power supply 300 via the ELB 104 into DC power.

  The ELB 104 is disposed between the AC power supply 300 and the AC / DC conversion unit 103, and blocks AC power supplied from the AC power supply 300 to the AC / DC conversion unit 103 under the control of the main control unit 108.

  The latch unit 105 locks (fixes) the charger-side connector 101 attached to the vehicle-side connector 201 to the vehicle-side connector 201 by a predetermined operation of the operator (hereinafter referred to as a lock operation). In addition, the latch unit 105 releases (releases) the lock for attaching the charger-side connector 101 to the vehicle-side connector 201 by a predetermined operation of the operator (hereinafter referred to as a release operation). Further, the latch unit 105 sets validity / invalidity of accepting the release operation from the operator according to the instruction from the main control unit 108.

  The communication unit 106 communicates with the electric vehicle 200 via the communication line 102E.

  The voltmeter 107 measures the output voltage of the charging power, that is, the voltage between the pair of charging lines 102A and 102B.

  The main control unit 108 performs overall control of each unit of the charger 100.

  The control system power supply 109 is a power supply for supplying control power to control systems such as the communication unit 106 and the main control unit 108. The control system power source 109 may be a battery or a power source generated by rectifying the AC fed from the AC power source 300. The control system power supply 109 supplies control power from the charger-side connector 101 to the relays 205A and 205B of the electric vehicle 200 via the pair of control power lines 102C and 102D.

  Next, a charging operation of the electric vehicle charging system according to the present embodiment will be described.

  FIG. 2 is a flowchart for explaining the charging operation of the electric vehicle charging system shown in FIG. In this flow, in a state where the charger-side connector 101 and the vehicle-side connector 201 are locked by the latch unit 105, the charger 100 receives an instruction to start charging from an operator via an operation panel (not shown). Is started.

  First, in the charger 100, the main control unit 108 instructs the latch unit 105 to disable the release operation. In response to this, the latch unit 105 maintains the mounting lock between the charger-side connector 101 and the vehicle-side connector 201 regardless of the presence or absence of a release operation from the operator (S101). Then, the main control unit 108 transmits a charge start notification to the electric vehicle 200 via the communication unit 106 and the charger-side connector 101 (S102).

  Next, in the electric vehicle 200, when the relay control unit 206 receives a charge start notification from the charger 100 via the vehicle-side connector 201 and the communication unit 207 (S201), the relay control unit 206 receives the charge start notification from the charger 100 via the vehicle-side connector 201. The pair of relays 205A and 205B that operate with the supplied control power is controlled to close (S202). Thus, the pair of charging lines 202A and 202B are connected to the pair of charging lines 102A and 102B of the charger 100, and the preparation for charging the in-vehicle battery 203 is completed.

  Then, the relay control unit 206 transmits a preparation completion notification to the charger 100 via the communication unit 207 and the vehicle-side connector 201 (S203).

  Next, in the charger 100, when the main control unit 108 receives a preparation completion notification from the electric vehicle 200 via the charger-side connector 101 and the communication unit 106 (S103), the main control unit 108 controls the ELB 104 to switch the AC / DC conversion unit 103. Connect to AC power supply 300. As a result, charging power is output from the AC / DC converter 103 to the pair of charging lines 102A and 102B, and charging of the in-vehicle battery 203 is started (S104).

  Thereafter, the main control unit 108 determines whether or not a predetermined charging end condition is satisfied based on the measured value of the voltmeter 107 or the like (S105). If the charging end condition is satisfied (YES in S105), the ELB 104 is controlled to disconnect the AC / DC converter 103 from the AC power supply 300. As a result, the output of the charging power from the AC / DC converter 103 to the pair of charging lines 102A and 102B is stopped, and the charging of the in-vehicle battery 203 ends (S106).

  Then, the main control unit 108 starts notifying the output voltage of the charging power that is sequentially measured by the voltmeter 107 to the electric vehicle 200 via the communication unit 106 and the charger-side connector 101 (S107). In addition, the main control unit 108 is connected to the electric vehicle 200 via the communication unit 106 and the charger-side connector 101 for the first monitoring time for detecting the closed fixation of one relay 205A and the closed fixation of the other relay 205B. A charge end notification with designation of the second monitoring time for detection is transmitted (S108).

  The start of notification of the measured value of the voltmeter 107 to the electric vehicle 200 (S107) may be performed immediately after the start of charging the in-vehicle battery 203 (S104).

  Next, in the electric vehicle 200, when the communication unit 207 receives a charging end notification from the charger 100 via the vehicle-side connector 201 (S 204), the charging end notification is sent to the relay control unit 206 and the closed sticking detection unit 208. hand over.

  In response to this, the relay control unit 206 controls to open one of the relays 205A and keeps the other relay 205B closed (S205). At this time, if the relay 205A is not closed and fixed, only the positive charging line 202A is disconnected, and the voltage between the pair of charging lines 102A and 102B of the charger 100 is lowered.

  On the other hand, the closed sticking detection unit 208 receives from the charger 100 via the vehicle-side connector 201 and the communication unit 207 until the first monitoring time designated by the charging end notification has elapsed (NO in S207). The measurement value of the voltmeter 107 is monitored to determine whether one of the relays 205A is closed and fixed (S206). Specifically, if the measured value of the voltmeter 107 decreases by a predetermined amount (for example, an amount corresponding to half of the measured value immediately before the end of charging) within the first monitoring time, one relay 205A is closed and fixed. Judge that it is not. On the other hand, when the amount of decrease in the measured value of the voltmeter 107 is less than the predetermined amount, it is determined that one of the relays 205A is closed and fixed.

  Next, after the elapse of the first monitoring time designated by the charging end notification (YES in S207), the relay control unit 206 controls closing of one relay 205A and controlling opening of the other relay 205B (S208). ). At this time, if the relay 205B is not closed and fixed, only the charging line 202B on the negative electrode side is disconnected, and the voltage between the pair of charging lines 102A and 102B of the charger 100 becomes low.

  On the other hand, the closed sticking detection unit 208 receives from the charger 100 via the vehicle-side connector 201 and the communication unit 207 until the second monitoring time designated by the charging end notification has elapsed (NO in S210). The measured value of the voltmeter 107 is monitored to determine whether or not the other relay 205B is closed and fixed (S209). Specifically, if the measured value of the voltmeter 107 decreases by a predetermined amount (for example, an amount corresponding to half of the measured value immediately before the end of charging) within the second monitoring time, the other relay 205B is closed and fixed. Judge that it is not. On the other hand, if the amount of decrease in the measured value of the voltmeter 107 is less than the predetermined value, it is determined that the other relay 205B is closed and fixed.

  Next, after the elapse of the second monitoring time designated by the charge end notification (YES in S210), the relay control unit 206 controls to open both the relay 205A and the relay 205B (S211). Further, the closed adhesion control unit 208 transmits the determination result of the closed adhesion of the relays 205A and 205B to the charger 100 via the communication unit 207 and the vehicle-side connector 201 (S212).

  Here, the determination result of the closed adhering may be displayed on a display unit (not shown) of the electric vehicle 200. Further, if the determination result of the closed adhering indicates that both of the relays 205A and 205B are closed adhering, the ECU turns off the ignition regardless of whether or not the operator performs an ignition operation. You may control.

  Next, in the charger 100, when the main control unit 108 receives the determination result of the closed closure of the relays 205A and 205B from the electric vehicle 200 via the charger-side connector 101 and the communication unit 106 (S109), this determination is made. It is determined whether or not the result indicates that both of the relays 205A and 205B are closed and fixed (S110). At this time, the determination result may be displayed on a display unit (not shown) of the charger 100.

  When the determination result indicates that at least one of the relays 205A and 205B is not closed and fixed (NO in S110), the main control unit 108 instructs the latch unit 105 to accept the release operation. In response to this, the latch unit 105 validates the acceptance of the release operation from the operator (S111).

  As a result, the operator can perform a release operation to release the mounting lock between the charger-side connector 101 and the vehicle-side connector 201 and pull out the charger-side connector 101 from the vehicle-side connector 201. When the charger-side connector 101 is pulled out from the vehicle-side connector 201, the supply of control power from the charger 100 to the relays 205A and 205B is stopped. For this reason, even if the relay control unit 206 malfunctions and closes the relays 205A and 205B, at least one of the relays 205A and 205B to which control power is not supplied remains open.

  On the other hand, when this determination result indicates that both relays 205A and 205B are closed and fixed (YES in S110), main control unit 108 instructs latch unit 105 to accept the release operation. Without ending this flow.

  As a result, the latch unit 105 remains disabled from accepting the release operation, and the attachment lock between the charger-side connector 101 and the vehicle-side connector 201 is maintained regardless of whether the release operation is performed by the operator.

  The embodiment of the present invention has been described above.

  In the present embodiment, the charger 100 starts supplying control power via the charger-side connector 101 attached to the vehicle-side connector 201 prior to the start of charging of the in-vehicle battery 203, and then the charger The in-vehicle battery 203 is charged by supplying charging power via the side connector 101. Then, even after stopping the supply of the charging power due to the end of charging of the in-vehicle battery 203, the control power is continuously supplied to the electric vehicle 200 for a predetermined monitoring time.

  On the other hand, in the electric vehicle 200, the control power supplied from the charger 100 via the vehicle-side connector 201 to the relays 205 </ b> A and 205 </ b> B disposed on the charging lines 202 </ b> A and 202 </ b> B between the vehicle-side connector 201 and the vehicle-mounted battery 203. To make it work. Further, the electric vehicle 200 controls closing of the relays 205A and 205B prior to the start of charging of the in-vehicle battery 203, and the in-vehicle battery 203 is charged by the charging power supplied from the charger 100 via the vehicle-side connector 201. Wait for it. Then, after charging of the in-vehicle battery 203, the relays 205A and 205B are alternately controlled to open within a predetermined monitoring time. During this time, the charger 100 measures the output voltage of the charging power while continuing to supply the control power to the electric vehicle 200 and notifies the electric vehicle 200 of the measured value. The electric vehicle 200 detects the closed adherence of the relays 205A and 205B based on the measured value of the output voltage of the charging power notified from the charger 100.

  Therefore, according to the present embodiment, the configuration of the charging system is used without adding to the electric vehicle 200 a voltmeter that measures the voltage of the charging lines 202A and 202B between the vehicle-side connector 201 and the relays 205A and 205B. Thus, it is possible to detect the closed adhesion of the relays 205A and 205B of the electric vehicle 200. Further, when the charger-side connector 101 is not attached to the vehicle-side connector 201, that is, when charging is not being performed, even if the relay control unit 206 malfunctions and controls the relays 205A and 205B to close, At least one of 205B can be reliably opened.

  In the present embodiment, charger 100 locks charger-side connector 101 attached to vehicle-side connector 201 to vehicle-side connector 201 during charging. If closed adhesion of both relays 205A and 205B of electric vehicle 200 is detected, the mounting lock is maintained regardless of the operator's release operation even after the end of charging.

  Therefore, according to the present embodiment, it is possible to prevent a situation where the charger-side connector 101 is pulled out from the vehicle-side connector 201 while the voltage of the in-vehicle battery 203 is applied to the vehicle-side connector 201.

  In this embodiment, in electric vehicle 200, relays 205A and 205B are arranged on positive and negative charging lines 202A and 202B that supply charging power to in-vehicle battery 203, respectively. Then, after the charging of the in-vehicle battery 203 is completed, the electric vehicle 200 controls to open one of the relays 205A and keep the other relay 205B closed until the first monitoring time elapses. The measured value of the voltmeter 107 sequentially notified from is monitored to determine whether one of the relays 205A is closed. Then, after the first monitoring time elapses, until the second monitoring time elapses, one relay 205A is controlled to close and the other relay 205B is controlled to open, during which the voltage sequentially notified from the charger 100 The measured value of the total 107 is monitored to determine whether the other relay 205B is closed.

  As described above, according to the present embodiment, it is possible to individually detect the closed adhesion of the relays 205A and 205B.

  Further, in the present embodiment, charger 100 transmits a charging end notification with designation of first and second monitoring times to electric vehicle 200 after charging of in-vehicle battery 203 ends. Therefore, according to the present embodiment, it is possible to more reliably determine whether the relays 205A and 205B are closed and stuck.

  In the above embodiment, first, one of the relays 205A is controlled to be open and the other relay 205B is kept closed, and then one of the relays 205A is controlled to close and the other relay 205B is controlled to open. As a result, it is determined that the relays 205A and 205B are closed and stuck. However, the present invention is not limited to this. First, one relay 205A is kept closed and the other relay 205B is controlled to open, and then one relay 205A is controlled to open and the other relay 205B is controlled to close. The closed sticking may be determined.

  Further, in the above-described embodiment, the case where the relays 205A and 205B that individually operate are arranged in the positive and negative charging lines 202A and 202B that supply charging power to the in-vehicle battery 203 has been described as an example. . However, the present invention is not limited to this. For example, as shown in FIG. 3A, the relay 205A may be arranged only on the positive charging line 202A, or the relay 205B may be arranged only on the negative charging line 202B. In addition, as shown in FIG. 3B, a relay 205C that opens and closes may be disposed so that both the positive and negative charging lines 202A and 202B can be disconnected and connected simultaneously. In these cases, in the electric vehicle 200, the relay control unit 206 controls to open the relay 205 </ b> C for a predetermined monitoring time during which the control power from the charger 100 continues to be supplied after the in-vehicle battery 203 is charged. Further, the closed sticking detection unit 208 monitors the measurement value of the voltmeter 107 sequentially notified from the charger 100 until the predetermined monitoring time elapses, and determines the closed sticking of the relay 205C.

  On the other hand, in charger 100, main control unit 108 continues to supply power for control to electric vehicle 200 until a predetermined monitoring time elapses after charging of in-vehicle battery 203, and communication unit 106 and The measured value of the output voltage of the charging power that is sequentially measured by the voltmeter 107 is notified to the electric vehicle 200 via the charger-side connector 101.

  Moreover, in the said embodiment, although determination of the closed adhering of relay 205A, 205B is performed by the electric vehicle 200 side, this invention is not limited to this. The determination of whether the relays 205 </ b> A and 205 </ b> B are firmly closed may be performed on the charger 100 side, and the determination result may be notified from the charger 100 to the electric vehicle 200.

  In addition, the present invention can be widely applied not only to the electric vehicle 200 but also to an electric vehicle having a charging function from an external power source of a mounted battery.

DESCRIPTION OF SYMBOLS 100: Charger, 101: Charger side connector, 102: Charging cable, 102A, 102B: Charging line, 102C, 102D: Control power line, 102E: Communication line, 103: AC / DC converter, 104: ELB, 105 : Latch unit, 106: communication unit, 107: voltmeter, 108: main control unit, 109: control system power supply, 200: electric vehicle, 201: vehicle side connector, 202A, 202B: charging line, 202C, 202D: control Power line, 202E: communication line, 203: vehicle battery, 204: auxiliary battery, 205A to 205C: relay, 206: relay control unit, 207: communication unit, 208: closed adhesion detection unit, 300: AC power supply

Claims (7)

A charging system comprising: an electric vehicle; and a charger that supplies electric power for charging to an in-vehicle battery of the electric vehicle,
The electric vehicle is
A vehicle-side connector for supplying charging power and control power;
A relay that is disposed on a charging line between the vehicle-side connector and the in-vehicle battery, and operates with the control power; and
Relay control means that operates with an auxiliary battery mounted on the electric vehicle and controls opening and closing of the relay;
Detecting means for detecting closed adhering of the relay;
Vehicle-side communication means for communicating with the charger,
The charger is
A charger-side connector for supplying the charging power and the control power;
Measuring means for measuring the output voltage of the charging power;
Power supply means for supplying the electric power for charging and the electric power for control to the electric vehicle via the charger-side connector attached to the vehicle-side connector,
The power supply means
Even after stopping charging of the charging power due to the end of charging of the in-vehicle battery, continuing to supply the control power,
The relay control means includes
Prior to starting charging of the in-vehicle battery, the relay is controlled to be closed, and after the charging of the in-vehicle battery is completed, the relay is controlled to be opened,
The measuring means includes
Transmitting the measured value of the output voltage of the charging power to the electric vehicle via the charger-side communication means,
The detection means includes
Charging characterized in that the relay is detected to be closed based on the measured value of the output voltage of the charging power after completion of charging of the in-vehicle battery received from the charger via the vehicle-side communication means. system. The charging system according to claim 1,
The charger is
Prior to the start of charging of the in-vehicle battery, the charger-side connector and the vehicle-side connector are locked, and according to a release operation received from an operator, further includes a lock unit that releases the lock,
The detection means includes
Sending the detection result of the closed closure of the relay to the charger via the vehicle side communication means,
The power supply means
When the detection result received from the electric vehicle via the charger-side communication means indicates that the relay is closed and fixed, the lock by the lock means is maintained regardless of whether or not the release operation is performed. Characteristic charging system. The charging system according to claim 1 or 2,
The relay is
The first relay arranged on one of the positive electrode side and the negative electrode side line constituting the charging line, and the second relay arranged on the other of the positive electrode side and the negative electrode side line,
The relay control means includes
Prior to starting charging of the in-vehicle battery, the first and second relays are closed and controlled, and after completion of charging of the in-vehicle battery, the first relay is opened until a first monitoring time elapses. The second relay remains in the closed control, and then the first relay is closed and the second relay is opened until the second monitoring time elapses.
The detection means includes
Based on the output voltage of the charging power measured by the measuring means within the first monitoring time after completion of charging of the in-vehicle battery, the first relay is detected to be closed and the first A charging system characterized by detecting closed adhering of the second relay based on an output voltage of the charging power measured by the measuring means within the second monitoring time after the elapse of the monitoring time. . The charging system according to claim 3,
The power supply means
After the supply of the power for charging is stopped, the first and second monitoring times are notified to the electric vehicle via the charger-side communication means.   The charger according to any one of claims 1 to 4.   The electric vehicle according to any one of claims 1 to 4. In a charging system having an electric vehicle and a charger for charging an in-vehicle battery of the electric vehicle, detection of closed adhesion of a relay disposed on a charging line between the vehicle-side connector of the electric vehicle and the in-vehicle battery is detected. A method,
The relay is
Operates with control power supplied from the charger via the vehicle-side connector,
The electric vehicle is
Prior to starting charging of the in-vehicle battery, closing the relay is controlled,
Charging the vehicle battery with charging power fed from the charger via the vehicle-side connector;
After charging of the in-vehicle battery is completed, the relay is controlled to be opened, and the relay is detected to be closed based on the measured value of the output voltage of the charging power notified from the charger. ,
The charger is
Prior to the start of supplying the charging power, starting the supply of the control power via the charger-side connector of the charger attached to the vehicle-side connector;
Supplying the charging power via the charger-side connector; and, after stopping supplying the charging power, continuing to supply the control power, measuring an output voltage of the charging power, A method for detecting closed adhesion of a relay, comprising performing a step of notifying the electric vehicle of the measurement value.

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