Control device for vehicle exterior charging device

Abstract

To accurately discriminate the kind of AC power, which is supplied from a vehicle exterior charging device, at the side of a vehicle.SOLUTION: A control device for a vehicle exterior charging device is configured to control the vehicle exterior charging device which supplies AC power to a charge loaded on a vehicle in order to charge a battery of the vehicle. The control device transmits a control pilot signal to a control device of the vehicle and changes the control pilot signal between the case where AC power to be supplied from the vehicle exterior charging device to the charger of the vehicle is single-phase AC power and the case where AC power to be supplied from the vehicle exterior charging device to the charger of the vehicle is three-phase AC power.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to an off-vehicle charging device that supplies AC power to a charger mounted on a vehicle to charge a battery of the vehicle. [Background technology]

[0002] Conventionally, a charging cable configured to electrically connect a vehicle and a charging facility outside the vehicle is known (see, for example, Patent Document 1). This charging cable includes a control pilot signal line, an abnormality detection unit that detects an abnormality in the charging cable, and a control unit. The control unit notifies a vehicle control device of the rated current of the charging cable by outputting a first control pilot signal to the control pilot signal line, and when an abnormality is detected by the abnormality detection unit, outputs a second control pilot signal to the control pilot signal line to notify the vehicle control device of the content of the abnormality. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-117704 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, when the power supplied from the external charging device to the vehicle side is AC power, it is necessary for the vehicle side to determine whether the AC power from outside the vehicle is single-phase AC power or three-phase AC power to prevent insufficient charging or prolonged charging time. However, the AC power from the external charging device fluctuates due to external factors such as the state of the grid voltage, and when determining the type of AC based on the phase voltage, etc., it may take a long time to make the determination or may result in an erroneous determination.

[0005] Therefore, a main object of the present disclosure is to enable the vehicle side to accurately determine the type of AC power supplied from an external charging device. [Means for solving the problem]

[0006] The control device of an off-vehicle charging device disclosed herein is an off-vehicle charging device control device that supplies AC power to a charger mounted on a vehicle to charge the vehicle's battery, and transmits a control pilot signal to the vehicle's control device, and changes the control pilot signal depending on whether the AC power supplied from the off-vehicle charging device to the charger of the vehicle is single-phase AC power or three-phase AC power.

[0007] The control device of the off-vehicle charging device disclosed herein changes the control pilot signal depending on whether the AC power supplied from the off-vehicle charging device to the vehicle charger is single-phase AC power or three-phase AC power. This allows the vehicle control device to accurately determine whether the AC power supplied from the off-vehicle charging device to the vehicle charger is single-phase AC power or three-phase AC power based on the control pilot signal. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic configuration diagram showing an external vehicle charging device including a control device according to the present disclosure. [Diagram 2] 4 is a time chart showing a control pilot signal exchanged between the control device of the external vehicle charging device of the present disclosure and the control device of the vehicle. [Diagram 3] 4 is a flowchart showing a routine executed by a control device of a vehicle when the battery of the vehicle is charged with electric power from an external vehicle charging device of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Next, an embodiment of the present disclosure will be described with reference to the drawings.

[0010] Fig. 1 is a schematic configuration diagram showing an off-vehicle charging device 1 including a control device 10 according to the present disclosure. The off-vehicle charging device 1 shown in the figure is an AC charging device that is installed, for example, at a charging stand and connected to an AC power source PS such as a commercial power source, and is capable of externally charging a battery (high-voltage battery) 21 of an electric vehicle 20. As shown in Fig. 1, in addition to the control device 10, the off-vehicle charging device 1 includes a charging cable 3 including a charging connector 2, and a CCID relay 4 interposed between the charging cable 3 and the AC power source PS.

[0011] The control device 10 of the off-vehicle charging device 1 includes a single-phase / three-phase setting switch 11, a CPLT circuit 12, a control circuit 15, and the like. When installing the off-vehicle charging device 1 at a charging stand or the like, the single-phase / three-phase setting switch 11 is set to either single-phase or three-phase by an operator according to the type of AC power source PS to which the off-vehicle charging device 1 is connected. The CPLT circuit 12 includes an oscillation circuit, a voltage sensor, a resistor, and the like, and is connected to a control pilot line (not shown) included in the charging cable 3. The CPLT circuit 12 outputs a control pilot signal (pulse signal) CPLT having a potential and a duty ratio set by the control circuit 15, respectively, to the control pilot line. When charging the battery 21 of the electric vehicle 20, the control circuit 15 controls the CPLT circuit 12 according to the setting state (single-phase or three-phase) of the single-phase / three-phase setting switch 11. In addition, the CCID relay 4 of the external charging device 1 is closed (ON) by electromagnetic force from an electromagnetic coil (not shown) when the potential of the control pilot signal CPLT reaches a predetermined charging execution potential Va (e.g., 6 V) that is lower than the reference potential V0 (e.g., 12 V).

[0012] The electric vehicle 20 is a battery electric vehicle (BEV) including, in addition to the battery 21, a motor generator MG that exchanges power with the battery 21 via a power control unit (PCU) not shown. However, the electric vehicle 20 may be a plug-in hybrid vehicle (PHEV). The motor generator MG is a synchronous generator motor (three-phase AC motor) and is connected to drive wheels via a power transmission mechanism including a gear mechanism. The motor generator MG is driven by power from the power control unit (battery 21) and outputs drive torque (drive force) to the drive wheels. In addition, the motor generator MG outputs regenerative braking torque to the drive wheels when braking the electric vehicle 20. The battery 21 is, for example, a lithium ion secondary battery or a nickel hydrogen secondary battery having a rated output voltage of 200 to 400 V. The battery 21 is connected to the power control unit via a system main relay not shown.

[0013] As shown in Fig. 1, the electric vehicle 20 further includes a charge / discharge inlet (receptacle) 22, an on-board charger 23, and a charging electronic control device (hereinafter referred to as "charging ECU") 25. The charge / discharge inlet 22 is provided on the body of the electric vehicle 20 and connected to the on-board charger 23. The charge / discharge inlet 22 is connected to the charging connector 2 of the off-vehicle charging device 1, a charging connector of a charging cable (EVSE) connected to a household power source (outlet), an external power supply connector (VPC), and the like. The on-board charger 23 includes an AC / DC converter and a DC / DC converter, and is connected to a power line between a system main relay and a power control device via a charging relay (not shown). When the charging relay and the system main relay are closed, the charge / discharge inlet 22 is connected to the battery 21 via the on-board charger 23 and the like. As a result, when the charging connector 2 of the external charging device 1 is connected to the charging / discharging inlet 22, the AC power supplied from outside the vehicle via the charging connector 2 can be converted into DC power by the on-board charger 23, and the battery 21 can be charged using the DC power.

[0014] The charging ECU 25 of the electric vehicle 20 includes a microcomputer having a CPU, ROM, RAM, a storage device, etc. (not shown). The charging ECU 25 receives a control pilot signal CPLT from the off-vehicle charging device 1 via an input buffer (not shown) that is connected to a control pilot line of the charging cable 3 via the charging / discharging inlet 22 and the charging connector 2. The charging ECU 25 can also change the potential of the control pilot signal CPLT by controlling a resistor circuit (not shown) that is connected to the control pilot line of the charging cable 3 via the charging connector 2. Furthermore, the charging ECU 25 controls the opening and closing of a charging relay and controls the on-vehicle charger 23.

[0015] Fig. 2 is a time chart for explaining the control pilot signal CPLT exchanged between the control device 10 of the off-vehicle charging device 1 and the charging ECU 25 of the electric vehicle 20. As shown in Fig. 2, when the off-vehicle charging device 1 is in a standby state and the charging connector 2 of the charging cable 3 is not connected to the charging / discharging inlet 22 of the electric vehicle 20 (such as time t0 in Fig. 2), the potential (high level) of the control pilot signal CPLT is the reference potential V0, and the CCID relay 4 of the off-vehicle charging device 1 is maintained in an open (OFF) state.

[0016] Furthermore, when the charging connector 2 of the charging cable 3 is connected to the charging / discharging inlet 22 of the electric vehicle 20 (time t1 in FIG. 2), the control circuit 15 of the control device 10 lowers the potential (high level) of the control pilot signal CPLT to a value according to the type of the AC power source PS to which the off-vehicle charging device 1 is connected. That is, when the AC power source PS is a single-phase AC power source, the control circuit 15 lowers the potential (high level) of the control pilot signal CPLT to a potential V1 (e.g., 9 V) that is lower than the reference potential V0 and higher than the charging execution potential Va. When the AC power source PS is a three-phase AC power source, the control circuit 15 lowers the potential (high level) of the control pilot signal CPLT to a potential V3 (e.g., 8.5 V) that is lower than the reference potential V0, higher than the charging execution potential Va, and different from the potential V1.

[0017] Furthermore, when the control circuit 15 confirms that the charging ECU 25 of the electric vehicle 20 has been started up (time t2 in FIG. 2) after lowering the potential of the control pilot signal CPLT to a value V1 or V3 according to the type of AC power source PS, it controls the CPLT circuit 12 to oscillate the control pilot signal CPLT at a predetermined frequency and duty ratio with the upper limit value of the potential set to the potential V1 or V3. At this time, the duty ratio of the control pilot signal CPLT is determined according to the maximum current (the rated current of the charging cable 3) that can be supplied from the off-vehicle charging device 1 to the electric vehicle 20 via the charging cable 3. The low-level potential of the control pilot signal CPLT is constant at -V0 (e.g., -12V).

[0018] 3 is a flowchart showing a routine executed by the charging ECU 25 of the electric vehicle 20 when charging the battery 21 with AC power from the off-vehicle charging device 1. The charging ECU 25 is started in response to connection of the charging connector 2 of the charging cable 3 to the charging / discharging inlet 22 of the electric vehicle 20, and acquires the maximum current (rated current) supplied from the off-vehicle charging device 1 based on the duty ratio of the control pilot signal CPLT from the off-vehicle charging device 1 (step S100). Furthermore, in step S100, the charging ECU 25 acquires the type of AC power from the off-vehicle charging device 1 based on the potential (high level) of the control pilot signal CPLT. That is, if the potential of the control pilot signal CPLT is potential V1, the charging ECU 25 determines that the AC power from the off-vehicle charging device 1 is single-phase AC power, and if the potential of the control pilot signal CPLT is potential V3, the charging ECU 25 determines that the AC power from the off-vehicle charging device 1 is three-phase AC power.

[0019] Next, the charging ECU 25 determines whether the electric vehicle 20 is in a state in which charging of the battery 21 can be started (step S110), and if the electric vehicle 20 is not in a state in which charging of the battery 21 can be started (step S120: NO), the charging ECU 25 waits until preparation for charging is completed. Furthermore, when the electric vehicle 20 is in a state in which charging of the battery 21 can be started (step S120: YES, time t3 in FIG. 2), the charging ECU 25 controls the above-mentioned resistance circuit so that the potential (high level) of the control pilot signal CPLT decreases to the charging execution potential Va (step S130).

[0020] 2, when the potential of the control pilot signal CPLT drops to the charging execution potential Va, the CCID relay 4 is closed (ON) by an electromagnetic force from an electromagnetic coil (not shown) of the off-vehicle charging device 1 in response to the drop in the potential of the control pilot signal CPLT. As a result, AC power from the AC power source PS is supplied to the on-board charger 23 of the electric vehicle 20 via the charging cable 3, the charging connector 2, and the charging / discharging inlet 22. After the process of step S130, the charging ECU 25 determines the type of AC power from the off-vehicle charging device 1 acquired in step S100 (step S140).

[0021] When the AC power from the external charging device 1 is single-phase AC power, the charging ECU 25 controls the on-board charger 23 to convert the single-phase AC power from the external charging device 1 to DC power based on the maximum current acquired in step S100 and supply the DC power to the battery 21 (step S150), and ends the routine of Fig. 3 when the SOC of the battery 21 reaches a predetermined target SOC. When the AC power from the external charging device 1 is three-phase AC power, the charging ECU 25 controls the on-board charger 23 to convert the three-phase AC power from the external charging device 1 to DC power based on the maximum current acquired in step S100 and supply the DC power to the battery 21 (step S160), and ends the routine of Fig. 3 when the SOC of the battery 21 reaches a predetermined target SOC.

[0022] As described above, the control device 10 of the off-vehicle charging device 1 changes the potential (high level) of the control pilot signal CPLT depending on whether the AC power supplied from the off-vehicle charging device 1 to the on-vehicle charger 23 of the electric vehicle 20 is single-phase AC power or three-phase AC power. This allows the charging ECU 25 as the control device of the electric vehicle 20 to accurately determine whether the AC power supplied from the off-vehicle charging device 1 to the on-vehicle charger 23 of the electric vehicle 20 is single-phase AC power or three-phase AC power, based on the control pilot signal CPLT.

[0023] Note that, instead of changing the potential of the control pilot signal CPLT according to the type of AC power supplied from the off-vehicle charging device 1 to the on-board charger 23 of the electric vehicle 20, a special pulse according to the type of AC power may be added to the control pilot signal CPLT, or the duty ratio of the control pilot signal CPLT may be changed according to the type of AC power. In addition, by transmitting the above-mentioned control pilot signal CPLT from an off-vehicle charging device or inspection device for vehicle inspection to the charging ECU 25 and returning the determination result of the type of AC power by the charging ECU 25 based on the control pilot signal CPLT to the off-vehicle charging device for vehicle inspection or the like via the control pilot signal CPLT, it becomes possible for the off-vehicle charging device for vehicle inspection or the like to check whether the charging ECU 25 can normally determine the type of AC power based on the control pilot signal CPLT.

[0024] Furthermore, if the charging ECU 25 can determine the type of AC power (single-phase or three-phase) based on the AC power (voltage waveform) from the external charging device 1, the charging ECU 25 may compare the determination result of the type of AC power based on the control pilot signal CPLT with the determination result of the type of AC power based on the voltage waveform, and if the two do not match, may stop charging the battery 21 or notify the user of the electric vehicle 20 that an abnormality may have occurred in the external power receiving device 1. This allows the user of the electric vehicle 20 to notify the manager of the charging station that an abnormality may have occurred in the external charging device 1, or to move the electric vehicle 20 to another charging station or the like to charge the battery 21.

[0025] In addition, the invention of the present disclosure is not limited to the above embodiment, and various modifications can be made within the scope of the present disclosure. Furthermore, the above embodiment is merely a specific form of the invention described in the Summary of the Invention, and does not limit the elements of the invention described in the Summary of the Invention. [Industrial Applicability]

[0026] The present disclosure is applicable to the off-vehicle charging device and vehicle manufacturing industries, etc. [Explanation of symbols]

[0027] 1 off-vehicle charging device, 2 charging connector, 3 charging cable, 4 CCID relay, 10 control device, 11 single-phase / three-phase setting switch, 12 CPLT circuit, 15 control circuit, 20 electric vehicle, 21 battery, 22 charge / discharge inlet, 23 on-board charger, 25 charging electronic control device (charging ECU), MG motor generator, PS AC power supply.

Claims

[Claim 1] A control device for an off-vehicle charging device that supplies AC power to a charger mounted on a vehicle to charge a battery of the vehicle, comprising: A control device for an off-vehicle charging device that transmits a control pilot signal to a control device of the vehicle, and changes the control pilot signal when the AC power supplied from the off-vehicle charging device to the charger of the vehicle is single-phase AC power and when the AC power supplied from the off-vehicle charging device to the charger of the vehicle is three-phase AC power.

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