Vehicle battery charging control device

Abstract

To provide a vehicle battery charging control device capable of preventing a time until external charging starts from becoming longer while enabling supplementary charging and external charging.SOLUTION: A supplementary charging device is provided that performs supplementary charging for charging a low-voltage battery with output power of a high-voltage battery. When an external charging start condition is established during implementation of supplementary charging, a command to start external charging is issued to a charger after the supplementary charging device is stopped. When a supplementary charging termination condition is established in a state where the external charging start condition is not established, control after supplementary charging stop for erasing predetermined information held by a control device and updating is performed after the supplementary charging device is stopped. When the supplementary charging termination condition is established along with establishment of the external charging start condition, implementation of the control after supplementary charging stop is restricted.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a battery charging control device for a vehicle, which is connected to a power supply device having a motor as a drive source, a high-voltage battery that supplies power to the motor, a low-voltage battery having an output voltage lower than that of the high-voltage battery, and a charger provided outside the vehicle, and realizes external charging for charging the high-voltage battery by the power supply device.

Background Art

[0002] Conventionally, in a vehicle equipped with a motor as a drive source, a high-voltage battery and a low-voltage battery having an output voltage lower than that of the high-voltage battery are mounted. The high-voltage battery supplies power to the motor, and the low-voltage battery supplies power to devices such as a controller and an audio. For example, Patent Document 1 discloses a vehicle including a motor generator as a drive source, a high-voltage battery (main battery in Patent Document 1) that supplies power to the motor generator, and a low-voltage battery (auxiliary battery in Patent Document 1) having an output voltage lower than that of the high-voltage battery, and is configured to charge the low-voltage battery with the high-voltage battery at regular intervals after the ignition switch is turned off.

[0003] Also, conventionally, in a part of a vehicle including a motor as a drive source and a high-voltage battery that supplies power to the motor, external charging for charging the high-voltage battery by a power supply device outside the vehicle using an external charger has been made possible.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a vehicle equipped with a motor as a drive source, a high-voltage battery, and a low-voltage battery, if both supplementary charging for charging the low-voltage battery with the high-voltage battery and the above-described external charging are enabled, the charge amounts of both the high-voltage battery and the low-voltage battery can be ensured.

[0006] However, if a control sequence for supplementary charging and a control sequence for external charging are simply constructed and configured to execute these control sequences, when a condition for starting external charging is satisfied during the execution of supplementary charging, the control sequence for supplementary charging and the control sequence for external charging may interfere with each other, and there is a risk that supplementary charging or external charging may not be appropriately performed. Therefore, when a condition for starting external charging is satisfied during the execution of supplementary charging, it is desirable to first end the supplementary charging and then start the external charging. On the other hand, if the time from when a condition for starting external charging is satisfied by the user operating a charger outside the vehicle until external charging starts becomes long, the user may feel uncomfortable. Therefore, when a condition for starting external charging is satisfied during the execution of supplementary charging, it is desired to end the supplementary charging and then start the external charging while preventing the time until external charging starts from becoming long.

[0007] The present invention has been made in view of the above circumstances, and an object thereof is to provide a battery charging control device for a vehicle that enables supplementary charging and external charging while preventing the time until external charging starts from becoming long.

Means for Solving the Problem

[0008] In a battery charging control device for a vehicle including a charging connection device that is connected to a power supply device having a motor as a drive source, a high-voltage battery that supplies power to the motor, a low-voltage battery having an output voltage lower than that of the high-voltage battery, and a charger provided outside the vehicle, and realizes external charging for charging the high-voltage battery by the power supply device, the battery charging control device includes a supplementary charging device that performs supplementary charging for charging the low-voltage battery with the output power of the high-voltage battery, and a control device that controls each device including the supplementary charging device. The control device determines whether or not an external charging start condition, which is a condition for starting the external charging, is satisfied, and when the external charging start condition is satisfied during the supplementary charging or when another predetermined condition is satisfied, determines that a supplementary charging end condition, which is a condition for ending the supplementary charging, is satisfied. When it is determined by the determination unit that the supplementary charging end condition is satisfied, a supplementary charging control unit that stops the supplementary charging device, and when it is determined by the determination unit that the external charging start condition is satisfied, an external charging control unit that issues a command to start the external charging to the charger. The external charging control unit issues the command to the charger after the supplementary charging device is stopped by the supplementary charging control unit when the external charging start condition is satisfied during the supplementary charging. The supplementary charging control unit performs post-supplementary charging stop control for erasing and updating predetermined information held by the control device after stopping the supplementary charging device when the supplementary charging end condition is satisfied while the external charging start condition is not satisfied, and restricts the execution of the post-supplementary charging stop control when the supplementary charging end condition is satisfied as the external charging start condition is satisfied. (Claim 1).

[0009] According to this device, external charging for charging the high-voltage battery by a power supply device outside the vehicle and supplementary charging for charging the low-voltage battery with the output power of the high-voltage battery are realized. Therefore, the charge amounts of both the high-voltage battery and the low-voltage battery can be ensured.

[0010] Moreover, in this device, when the external charging start condition is satisfied, it is determined that the supplementary charging end condition is satisfied, and after the supplementary charging device stops, that is, after the supplementary charging ends, a command to start external charging is issued to the charger and the external charging starts. Therefore, it is possible to suppress interference between the control sequence for performing supplementary charging and the control sequence for starting external charging.

[0011] Also, when the supplementary charging end condition is satisfied while the external charging start condition is not satisfied, control after supplementary charging stop is performed to erase and update predetermined information held by the control device. Therefore, the control device can be reset by using the timing to end supplementary charging.

[0012] However, when the supplementary charging end condition is satisfied as the external charging start condition is satisfied, if the control after supplementary charging stop is performed and completed and then the external charging is started, the start of the external charging will be delayed. In contrast, in the present invention, when the supplementary charging end condition is satisfied as the external charging start condition is satisfied, the execution of the control after supplementary charging stop is restricted. That is, part or all of the control after supplementary charging stop is omitted. Therefore, it is possible to prevent the time from when the external charging start condition is satisfied until the external charging starts from becoming long.

[0013] In the above configuration, preferably, when performing the control after supplementary charging stop, the supplementary charging control unit erases a signal for realizing CAN communication between the control device and the charger, and updates the signal, and when the supplementary charging end condition is satisfied as the external charging start condition is satisfied, prohibits the execution of the control after supplementary charging stop (Claim 2).

[0014] According to this configuration, the signal for realizing CAN communication between the control device and the charger can be reset by using the timing to end the supplementary charging. However, if the signal is reset also when the supplementary charging end condition is satisfied along with the establishment of the external charging start condition, the output of the information necessary for starting the external charging from the control device to the charger is interrupted, resulting in a delay in the start time of the external charging. In contrast, in this configuration, when the supplementary charging end condition is satisfied along with the establishment of the external charging start condition, the post-supplementary charging stop control including the reset process of the above signal is prohibited, so that the delay in the start time of the external charging can be surely suppressed.

[0015] In the above configuration, preferably, a temporary storage device capable of storing information regarding the supplementary charging device only during the operation of the supplementary charging device, a storage device capable of storing information regarding the supplementary charging device both during and after the operation of the supplementary charging device, and a writing processing device that performs a writing process of writing and storing the information stored in the temporary storage device in the storage device are further provided. When the supplementary charging end condition is satisfied, the supplementary charging control unit stops the supplementary charging device after causing the writing processing device to perform the writing process (Claim 3).

[0016] According to this configuration, the information related to the supplementary charging device can be continuously stored in the storage device even after the supplementary charging device stops.

[0017] Here, if the above writing process is performed when the supplementary charging end condition is satisfied along with the establishment of the external charging start condition, the start time of the external charging is delayed by the time required for the writing process. In contrast, in the present invention, as described above, when the supplementary charging end condition is satisfied along with the establishment of the external charging start condition, the delay in the start time of the external charging is suppressed by the restriction of the post-supplementary charging stop control. Therefore, even when the supplementary charging end condition is satisfied along with the establishment of the external charging start condition, it is possible to prevent the start time of the external charging from being excessively delayed while performing the above writing process.

[0018] In the above configuration, preferably, a disconnection device capable of disconnecting and connecting the electrical connection between the high-voltage circuit including the low-voltage battery and the high-voltage battery, and a forced opening command output device capable of outputting a forced opening command, which is a command for forcibly opening the disconnection device, are provided. The charging control unit determines whether the forced opening command is output from the forced opening command output device when performing post-charging stop control (Claim 4).

[0019] According to this configuration, using the end timing of the charging, it is possible to determine whether or not a forced opening command can be output, that is, whether or not the electrical connection between the high-voltage circuit and the high-voltage battery can be forcibly interrupted by forcibly opening the disconnection device.

[0020] In the above configuration, preferably, a disconnection device capable of disconnecting and connecting the electrical connection between the high-voltage circuit including the low-voltage battery and the high-voltage battery is provided. When the charging end condition is satisfied, the charging control unit opens the disconnection device capable of disconnecting and connecting the electrical connection between the high-voltage circuit including the low-voltage battery and the high-voltage battery before stopping the charging device. When the external charging start condition is satisfied, the external charging control unit stops the charging device after opening the disconnection device, and when the external charging start condition is satisfied during the charging, after the disconnection device is opened and the charging device is stopped by the charging control unit, the disconnection device is closed and the charging device is started (Claim 5).

[0021] In this configuration, when the external charging start condition is satisfied, the disconnection device is closed and the charging device is started to start charging. That is, charging is also performed during external charging. Therefore, the charge amounts of both the high-voltage battery and the low-voltage battery can be more ensured.

[0022] Moreover, according to this configuration, when the external charging start condition is satisfied during the execution of the supplementary charging, after the disconnection / connection device is opened and the supplementary charging device is stopped, the disconnection / connection device is closed and the supplementary charging device is started. Therefore, it is possible to prevent interference between the control of opening the disconnection / connection device and stopping the supplementary charging device, which is performed when the supplementary charging ends, and the control of closing the disconnection / connection device and starting the supplementary charging device, which is performed when the external charging starts.

Advantages of the Invention

[0023] According to the battery charging control device for a vehicle of the present invention, it is possible to suppress an increase in the time until the external charging is started while enabling the supplementary charging and the external charging.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Best Mode for Carrying Out the Invention

[0025] (Overall Configuration of Vehicle) A battery charging control device for a vehicle according to an embodiment of the present invention will be described. FIG. 1 is a diagram schematically showing the configuration of a vehicle 1 equipped with a battery charging control device 100 according to the present embodiment. The vehicle 1 is, for example, a four-wheel automobile.

[0026] The vehicle 1 (battery charging control device 100) includes a high-voltage battery 2, a low-voltage battery 3 having an output voltage lower than that of the high-voltage battery 2, a high-voltage circuit 30 having a plurality of electrical devices and electrically connected to the high-voltage battery 2, and a charging connection device 50. Further, the vehicle 1 has a plurality of controllers including a microprocessor or the like for controlling each part of the vehicle 1.

[0027] (Battery) In the present embodiment, a Li battery (lithium battery) is mounted on the vehicle 1 as the high-voltage battery 2. For example, the high-voltage battery 2 includes a plurality of battery modules each composed of 12 battery cells connected in 2 parallel × 6 series, and these battery modules are connected in series. Further, in the present embodiment, a lead battery is mounted on the vehicle 1 as the low-voltage battery 3. For example, the nominal voltage of the high-voltage battery 2 is 24V, and the nominal voltage of the low-voltage battery 3 is 12V.

[0028] Detection devices such as a battery current sensor SN1 for detecting the current of the high-voltage battery 2 and a battery temperature sensor SN2 for detecting the temperature of the high-voltage battery 2 are provided on the high-voltage battery 2. Although not shown, a battery heater for raising the temperature of the battery module is provided on the high-voltage battery 2.

[0029] (High-Voltage Circuit) The high-voltage circuit 30 includes, as electrical devices, a motor 4, a generator 5, an inverter 6, a converter 7, a DC / DC converter 8, a PTC heater 9, an electric compressor 10, etc. Further, the high-voltage circuit 30 includes a high-voltage line 31 that connects these electrical devices.

[0030] The inverter 6, the converter 7, the DC / DC converter 8, the PTC heater 9, and the electric compressor 10 are each connected to the high-voltage line 31. The motor 4 is connected to the high-voltage line 31 via the inverter 6. The generator 5 is connected to the high-voltage line 31 via the converter 7.

[0031] The motor 4 rotates by receiving power supply from the high-voltage battery 2. The motor 4 is mounted on the vehicle 1 as a drive source of the vehicle 1, and the output of the motor 4 is transmitted to wheels (not shown) via the drive force transmission device 12.

[0032] The generator 5 is a power generation device for charging the high-voltage battery 2. The vehicle 1 of the present embodiment is a series hybrid vehicle. That is, the vehicle 1 is equipped with an engine 22 that drives the generator 5. The generator 5 is rotationally driven by the engine 22 to generate electricity, and the electricity generated by the generator 5 is supplied to the high-voltage battery 2. The engine 22 is, for example, a rotary engine. Note that the generator 5 is also connected to the wheels via the drive force transmission device 12, and the vehicle 1 can regenerate the energy during deceleration.

[0033] The inverter 6 is a device that converts direct current into alternating current, and converts the direct current from the high-voltage battery 2 into alternating current and supplies it to the motor 4. The converter 7 is a device that converts alternating current into direct current, and converts the alternating current generated by the generator 5 into direct current and supplies it to the high-voltage battery 2.

[0034] The DC / DC converter 8 is a device that steps down and outputs input power. In the vehicle 1, it is possible to perform supplementary charging to charge the low-voltage battery 3 with the output voltage of the high-voltage battery 2, and the DC / DC converter 8 is incorporated into the high-voltage circuit 30 so that it can step down the output voltage of the high-voltage battery 2 and supply it to the low-voltage battery 3.

[0035] The PTC heater 9 and the electric compressor 10 constitute the air conditioning device 11 of the vehicle 1. Specifically, the PTC heater 9 is a device for heating the interior of the vehicle 1, and the electric compressor 10 is a device for cooling the interior of the vehicle 1. In this embodiment, a cooling plate (not shown) for cooling the high-voltage battery 2 is provided, and the electric compressor 10 also cools this cooling plate.

[0036] (Main contactor) A pair of main contactors 71, 71 are provided between the high-voltage battery 2 and the high-voltage circuit 30. The main contactors 71, 71 are contactors, that is, electromagnetic switches including electromagnets, and are devices that disconnect and connect the electrical connection between two contacts according to the supplied power. When the contactor is closed, the two contacts are electrically connected and in a powered state, and when the contactor is opened, the two contacts are electrically disconnected and in a non-powered state. The main contactors 71, 71 disconnect and connect the electrical connection between the high-voltage battery 2 and the high-voltage circuit 30. Specifically, one main contactor 71 disconnects and connects the electrical connection between the positive electrode side line of the high-voltage battery 2 and the positive electrode side line of the high-voltage circuit 30, and the other main contactor 71 disconnects and connects the electrical connection between the negative electrode side line of the high-voltage battery 2 and the negative electrode side line of the high-voltage circuit 30. The main contactors 71, 71 correspond to the "disconnecting and connecting device" in the claims.

[0037] (Charging connection device) The charging connection device 50 is a device that electrically connects the power supply device 310 and the high-voltage battery 2 by being connected to the power supply device 310 having a charger 312 provided outside the vehicle. When the power supply device 310 and the high-voltage battery 2 are electrically connected via the charging connection device 50, external charging for charging the high-voltage battery 2 by the power supply device 310 is realized. The start / stop of external charging, that is, the switching of the output / stop of power from the power supply device 310 to the high-voltage battery 2 and the adjustment of the current output from the power supply device 310 to the high-voltage battery 2, etc. are carried out by the charger 312 of the power supply device 310. In this embodiment, the power supply device 310 is a DC power supply. Hereinafter, the charging connection device 50 is referred to as a DC charging connection device 50, the power supply device 310 to which this is connected is referred to as a DC power supply device 310, and the charger of the DC power supply device 310 is referred to as a DC charger 312.

[0038] The DC charging connection device 50 is configured to fit with a connector (hereinafter referred to as a DC connector) provided at the end of a cable connected to the DC charger 312 (DC power supply device 310), and by this fitting, the DC charger 312 (DC power supply device 310) and the high-voltage battery 2 are electrically connected.

[0039] The DC charging connection device 50 is connected to the DC charger 312 (DC power supply device 310) by a power line and is also connected by a CAN - BUS. The DC charging connection device 50 is connected to a C - BCM200, which will be described later, by a CAN - BUS. By fitting the DC charging connection device 50 and the DC connector, the C - BCM200 and the DC charger 312 (DC power supply device 310) are connected so as to be CAN - communicable.

[0040] Between the DC charging connection device 50 and the high-voltage circuit 30, QBC contacts 73, 73, which are contacts for disconnecting and connecting these electrical connections, are provided. The DC charging connection device 50 is electrically connected to the high-voltage battery 2 via the QBC contacts 73, 73, the high-voltage circuit 30, and the main contacts 71, 71. Note that one QBC contact 73 disconnects and connects the electrical connection between the positive line of the high-voltage circuit 30 and the positive line of the DC charging connection device 50, and the other QBC contact 73 disconnects and connects the electrical connection between the negative line of the high-voltage circuit 30 and the negative line of the DC charging connection device 50.

[0041] (Controller) Figure 2 is a block diagram showing the relationship between the controllers mounted on the vehicle 1. In the vehicle 1, as controllers, a C-BCM (Center-Body Control Module) 200, a PCM (Power Control Module) 201, an ECM (Engine Control Module) 202, a DMCM (Driver Moor Control Module) 203, an SGCM (Starter Generator Control Module) 204, a BECM (Battery Energy Control Module) 205, an ESU (Electric Supply Unit) 206, and a DC / DC control unit 207 are mounted. Further, in the vehicle 1, an HMI device (HMI: Human Machine Interface) 210, which is a device for displaying various information including a display, is mounted. The above PCM 201 corresponds to the "control device" in the claims.

[0042] The C-BCM 200 mainly controls doors and windows. The PCM 201 mainly controls the devices of the drive system of the vehicle 1. The ECM 202 mainly controls the engine 22. The DMCM 203 controls the inverter 6. The SGCM 204 controls the converter 7. The ESU 206 controls the air conditioning device 11.

[0043] The DC / DC control unit 207 controls the DC / DC converter 8. The DC / DC converter 8 and the DC / DC control unit 207 that controls it constitute a charging device 20 that realizes a supplementary charge for charging the low-voltage battery 3 with the output voltage of the high-voltage battery 2.

[0044] The BECM 205 performs various operations related to the high-voltage battery 2. Specifically, the BECM 205 calculates the SOC of the high-voltage battery 2. In detail, the BECM 205 calculates an initial value of the SOC of the high-voltage battery 2 based on the detection values of the battery current sensor SN1 and the battery temperature sensor SN2 in a state where the main contacts 71, 71 are open. Then, the BECM 205 updates the battery SOC by integrating the increase or decrease amount of the battery SOC per unit time calculated based on the detection values with respect to this initial value. In addition, the BECM 205 performs a failure determination of the high-voltage battery 2, the battery current sensor SN1, and the battery temperature sensor SN2.

[0045] Each of the controllers 200 to 207 operates receiving power from the low-voltage battery 3. Also, the controllers 200 to 207 are connected by a CAN-BUS so that they can communicate with each other by CAN (Controller Area Network) communication.

[0046] As shown in FIG. 3 described later, at least the DC / DC control unit 207 among the controllers has a CPU (Central Processing Unit) 207A, a volatile memory 207B that can store information only while power is being supplied, that is, only during the operation of the charging device 20 including the DC / DC control unit 207, and a non-volatile memory 207C that can continuously store information both during and after the power supply is stopped, that is, during and after the operation of the charging device 20 including the DC / DC control unit 207. In the present embodiment, the CPU 207A of the DC / DC control unit 207 corresponds to the "writing processing device" in the claims, the volatile memory 207B corresponds to the "temporary storage device" in the claims, and the non-volatile memory 207C corresponds to the "storage device" in the claims.

[0047] (Charge control) The control related to external charging and supplementary charging is mainly implemented by the PCM201. FIG. 3 is a control block diagram related to these controls. The PCM201 functionally includes a determination unit 211, an external charge control unit 212, and a supplementary charge control unit 213. The determination unit 211 determines the success or failure of the external charge start condition, which is the condition for starting external charging, and the supplementary charge end condition, which is the condition for ending supplementary charging. The external charge control unit 212 performs control to start external charging. The supplementary charge control unit 213 performs control to end supplementary charging.

[0048] As shown in FIG. 3, the PCM201 is electrically connected to the DC charging connection device 50, and a signal is input to the PCM201 from the DC charging connection device 50. Also, through CAN communication, detection values such as the battery SOC calculated by the BECM205, the battery current sensor SN1 input to the BECM205, and the battery temperature sensor SN2 are input to the PCM201 from the BECM205.

[0049] The PCM201 is electrically connected to the main contactors 71, 71 and the QBC contactors 73, 73 respectively, and opens and closes them. Specifically, the PCM201 opens and closes these contactors 71, 73 by switching the supply and stop of power from the low-voltage battery 3 to each contactor 71, 73.

[0050] The PCM201 is electrically connected to the supplementary charging device 20, and switches the startup (operation) / stop of the supplementary charging device 20 (DC / DC control unit 207 and DC / DC converter 8). Specifically, the supplementary charging device 20 is configured to start (operate) when power is supplied from the low-voltage battery 3, and the PCM201 switches the supply and stop of power from the low-voltage battery 3 to the supplementary charging device 20.

[0051] The PCM201 communicates with the DC charger 312 via CAN through the C-BCM200 and the DC charging connection device 50. Also, as shown in FIG. 2, the PCM201 also communicates with the ECM202, DMCM203, SGCM204, BECM205, and the DC / DC control unit 207 (charging device 20) via CAN. That is, these C-BCM200, DC charger 312, and PCM201, the ECM202, DMCM203, SGCM204, BECM205, and the DC / DC control unit 207 (charging device 20) are CAN communication devices that communicate with the PCM201 via CAN.

[0052] (External charging start control) The control performed at the start of external charging will be described with reference to FIGS. 4 and 5. FIG. 4 is a flowchart showing the control procedure performed by the PCM201. FIG. 5 is a diagram showing the control contents of each controller.

[0053] As shown in FIG. 4, first, the PCM201 determines whether the external charging start condition is satisfied (step S1). As shown in FIG. 5, when the PCM201 receives a charging start signal from the DC charging connection device 50, it determines that the external charging start condition is satisfied. The charging start signal is transmitted from the DC charging connection device 50 to the PCM201 when the DC charging connection device 50 and the DC connector are mated.

[0054] When it is determined that the external charging start condition is satisfied (when the determination in step S1 is YES), the PCM201 generates a CAN request signal, which is a signal for realizing CAN communication with the DC charger 312, to start CAN communication with the DC charger 312, and transmits this to the DC charger 312 (step S2). As shown in FIG. 5, when the CAN request signal is transmitted from the PCM201 to the DC charger 312, the DC charger 312 receives it. Thereby, CAN communication via the C-BCM200 and the DC charging connection device 50 is started between the PCM201 and the DC charger 312.

[0055] Also, when supplementary charging is being performed when the external charging start condition is satisfied, that is, when the external charging start condition is satisfied during the supplementary charging (when the determination in step S3 is YES), the PCM 201 determines that the supplementary charging end condition is satisfied as described later and performs supplementary charging end control to end the supplementary charging (step S4).

[0056] On the other hand, when supplementary charging is not being performed when the external charging start condition is satisfied, that is, when the external charging start condition is satisfied in a state where supplementary charging is not being performed (when the determination in step S3 is NO), or after the supplementary charging end control is ended, the PCM 201 transmits external charging pre-information, which is information for more appropriately performing external charging, to the DC charger 312 by CAN communication (step S5).

[0057] Specifically, the PCM 201 calculates the maximum charging time, which is the maximum value of the time required to fully charge the high-voltage battery 2, based on the battery SOC received from the BECM 205, the detection values of the battery current sensor SN1, and the battery temperature sensor SN2. Then, information such as this maximum charging time and the temperature of the high-voltage battery 2 is transmitted to the DC charger 312. The DC charger 312 adjusts the power output to the high-voltage battery 2 based on the received external charging pre-information. For example, when the maximum charging time has elapsed since the start of the power output, the power output is stopped, and when the temperature of the high-voltage battery 2 detected by the battery temperature sensor SN2 is high, the output current is decreased.

[0058] After step S5, the PCM 201 closes each contactor (step S6). Specifically, the PCM 201 closes the main contactors 71, 71 and the QBC contactors 73, 73. As a result, the high-voltage battery 2 and the high-voltage circuit 30 are electrically connected, and the high-voltage battery 2 and the DC charger 312 are electrically connected via the high-voltage circuit 30.

[0059] Here, external charging is performed while the vehicle is parked. When the vehicle is parked and no supplementary charging is being performed, each contact 71, 73 is open. Also, even when supplementary charging is being performed, as will be described later, each contact 71, 73 will be opened as the supplementary charging end control is implemented. From this, in step S6, each contact 71, 73 that was open will be closed.

[0060] In the vehicle 1 of this embodiment, supplementary charging is performed during external charging. From this, after step S6, the PCM 201 activates the supplementary charging device 20 and starts its operation (step S7). Specifically, the PCM 201 starts supplying power from the low-voltage battery 3 to the DC / DC converter 8 to activate the DC / DC converter 8 and allow power to be input thereto. Also, the PCM 201 starts supplying power from the low-voltage battery 3 to the DC / DC control unit 207 to activate it.

[0061] As shown in FIG. 5, when the activation of the supplementary charging device 20 is completed, an activation completion signal is transmitted from the supplementary charging device 20 to the PCM 201. The PCM 201 waits for this activation completion signal to be input (waits for the determination in step S8 to become YES), and then performs the next step S9.

[0062] In step S9, the PCM 201 issues a command to start external charging to the DC charger 312 to start external charging (permit power output from the DC power supply device 310 to the vehicle 1 side). Specifically, as shown in FIG. 5, the PCM 201 transmits a charging start signal to the DC charger 312. When the DC charger 312 receives the charging start signal from the PCM 201, it starts supplying power from the DC power supply device 310 to the high-voltage battery 2.

[0063] (Supplementary Charging End Control) Next, the control performed at the end of supplementary charging will be described with reference to FIGS. 6 and 7. FIG. 6 is a flowchart showing the control procedure performed by the PCM 201. FIG. 7 is a diagram showing the control contents of each controller.

[0064] The PCM 201 first determines whether or not the recharge end condition is satisfied (step S21).

[0065] In the present embodiment, when the external charging start condition is satisfied during the recharge, the recharge is terminated. From this, the PCM 201 determines that the recharge end condition is satisfied when the external charging start condition is satisfied during the recharge. Further, after the start of the recharge, when the low-voltage battery 3 is fully charged, a request to drive the PTC heater 9 is issued, or a request to drive the battery heater is issued, the PCM 201 determines that the recharge end condition is satisfied. These conditions that the low-voltage battery 3 is fully charged, a request to drive the PTC heater 9 is issued, or a request to drive the battery heater is issued correspond to the "other predetermined conditions" in the claims.

[0066] When it is determined that the recharge end condition is satisfied (when the determination in step S21 is YES), the PCM 201 opens the main contacts 71, 71 (step S22). That is, during the recharge, the main contacts 71, 71 are closed, and in step S22, the main contacts 71, 71 are switched from the closed state to the open state.

[0067] Next, the PCM 201 transmits a cutoff request signal to the recharge device 20 to stop the recharge device 20 (step S23).

[0068] As shown in FIG. 7, when the cutoff request signal is received (step Q21), the recharge device 20 performs a writing process of writing and storing various information stored in the volatile memory 207B in the non-volatile memory 207C (step Q22).

[0069] For example, while the vehicle 1 is running or during the charging process when the charging device 20 is operating (when receiving power supply), the CPU 207A of the charging device 20 determines whether each part of the charging device 20, such as the DC / DC converter 8, is malfunctioning, and stores the determination result in the volatile memory 207B. When the CPU 207A of the charging device 20 receives a cutoff request signal from the PCM 201, it writes the information about the charging device 20 including the above determination result stored in the volatile memory 207B into the non-volatile memory 207C.

[0070] When the above writing process is completed, the charging device 20 (CPU 207A) sends a cutoff permission signal that permits the charging device 20 to stop to the PCM 201 (step Q23).

[0071] Returning to FIG. 6, the PCM 201 waits for a cutoff permission signal to be input from the charging device 20 (waits for the determination in step S24 to become YES), and proceeds to the next step S25.

[0072] In step S25, the PCM 201 stops the charging device 20. Specifically, the PCM 201 stops the power supply from the low-voltage battery 3 to the charging device 20 (DC / DC control unit 207 and DC / DC converter 8).

[0073] After step S25, the PCM 201 determines whether the external charging start condition is satisfied, that is, determines whether the charging end condition is satisfied when the external charging start condition is satisfied (step S26). If this determination is NO, that is, if it is determined that the external charging start condition is not satisfied and the charging end condition is satisfied in a state where the external charging start condition is not satisfied, the PCM 201 starts the post-charging stop process (step S27). This post-charging stop process corresponds to the "post-charging stop control" in the claims.

[0074] The post - supplementary - charge stop process includes a process of resetting part of the PCM201. That is, as shown in FIG. 7, the post - supplementary - charge stop process includes an information - erasing process (step S27A) of erasing part of the information (signals) generated by the PCM201 through its own operations or obtained from other controllers, etc., and held by itself, and a re - calculation and re - acquisition process (update control, step S27B) of calculating (regenerating) or re - acquiring at least part of the erased information and updating it.

[0075] In the above - mentioned information - erasing process, the PCM201 erases at least the following two pieces of information. (1) The PCM201 erases the information (signals) that it has transmitted to the CAN communication device to realize CAN communication. (2) The PCM201 erases the determination result of the abnormality determination of the main contactor forced opening system that was implemented last time and has been stored so far. Then, in the above - mentioned re - calculation and re - acquisition process, the PCM201 re - calculates and re - acquires this information. That is, (1) The PCM201 re - calculates (regenerates) the erased information for realizing CAN communication and re - transmits it to the CAN communication device to resume CAN communication with the CAN communication device. (2) The PCM201 implements the abnormality determination of the main contactor forced opening system and updates the abnormality determination result. The details of the abnormality determination of the main contactor forced opening system will be described later.

[0076] Also, the post - supplementary - charge stop process includes a battery - information update process (step S27C) of updating the information of the high - voltage battery 2 stored by the PCM201. Specifically, the PCM201 requests the BECM205 to transmit the latest battery SOC and the latest detection values of the battery current sensor SN1 and the battery temperature sensor SN2, receives this information from the BECM205, and updates the information stored so far. Specifically, when the main contactors 71, 71 are switched from the closed state to the open state in step S22, the BECM205 calculates the initial value of the battery SOC and transmits this initial value of the battery SOC to the PCM201.

[0077] The abnormal determination of the main contactor forced opening system will be described with reference to FIG. 8.

[0078] As shown in FIG. 8, the PCM 201 includes a microcomputer 201A (including a CPU, a memory, etc.) and a system LSI 201C for monitoring the microcomputer 201A. A signal SS5 indicating whether the microcomputer 201A is normal is output from the system LSI 201C. The PCM 201 has an output driver 201B that generates an output signal SS1 to the main contacts 71, 71. The main contacts 71, 71 are opened and closed according to the output signal SS1 from the output driver 201B. The output signal SS1 of the output driver 201B is input to the microcomputer 201A as a monitor signal SS2, and the microcomputer 201A can monitor the output signal SS1 of the output driver 201B. In addition to a normal drive signal SS3 for opening and closing the main contacts 71, 71, a cutoff signal SS4 for forcibly opening the main contacts 71, 71 is output from the microcomputer 201A. The above output driver 201B corresponds to the "forced opening command output device" in the claims.

[0079] When a signal indicating that the microcomputer 201A is normal is output from the system LSI 201C and the cutoff signal SS4 is not output from the microcomputer 201A, the output driver 201B outputs the drive signal SS3. Thus, in this case, the main contacts 71, 71 are opened and closed according to the drive signal SS3. On the other hand, when a signal indicating that the microcomputer is abnormal is output from the system LSI 201C (or when a signal indicating normality is not output), or when the cutoff signal SS4 is output from the microcomputer 201A, regardless of the drive signal SS3, the output driver 201B outputs a signal for forcibly opening the main contacts 71, 71. Thus, in this case, the main contacts 71, 71 are forcibly opened regardless of the drive signal SS3.

[0080] An abnormality determination of the main contact forced opening system is a process of determining whether the main contacts 71 and 71 can be forcibly opened by the signal output from the system LSI 201C and the output of the cutoff signal SS4, that is, whether a command for forcibly opening the main contacts 71 and 71 can be correctly output from the output driver 201B. This determination is performed for each of the system LSI 201C and the cutoff signal SS4. Hereinafter, a signal for opening the main contacts 71 and 71 is referred to as an open signal, and a signal for closing the main contacts is referred to as a close signal.

[0081] As a specific procedure for the abnormality determination of the system LSI 201C, the PCM 201 first sets the drive signal SS3 to an open signal and sets the output signal SS5 of the system LSI 201C to a signal when the microcomputer 201A is abnormal. Note that in step S22, the main contacts 71 and 71 are already opened. That is, the drive signal SS3 is already an open signal and this is maintained. Also, the PCM 201 stops the output of the cutoff signal SS4.

[0082] Next, the PCM 201 sets the drive signal SS3 to a close signal while maintaining the output signal of the system LSI 201C as a signal when the microcomputer 201A is abnormal.

[0083] At this time, if the system LSI 201C properly outputs a signal indicating that the microcomputer 201A is abnormal, even if the drive signal SS3 switches from an open signal to a closed signal, the signal output from the output driver 201B remains an open signal. On the other hand, if the system LSI 201C does not properly output a signal indicating that the microcomputer 201A is abnormal, when the drive signal SS3 switches from an open signal to a closed signal, the output signal SS1 of the output driver 201B switches to a closed signal. From this, the PCM 201 determines whether the monitor signal SS2 has switched from an open signal to a closed signal as the drive signal SS3 switches to a closed signal. If the monitor signal SS2 has switched, it is determined that the system LSI 201C does not properly output a signal indicating that the microcomputer 201A is abnormal, and that a command for forcibly opening the main contacts 71, 71 from the system LSI 201C is not correctly output. On the other hand, if the monitor signal SS2 has switched as the drive signal SS3 switches to a closed signal, the PCM 201 determines that the above command is correctly output.

[0084] As a specific determination procedure for the cutoff signal SS4, the PCM 201 first sets the drive signal SS3 to an open signal (and maintains it as an open signal) and outputs the cutoff signal SS4. At this time, the system LSI is made to output a signal indicating that the microcomputer 201A is normal. Next, the PCM 201 sets the drive signal SS3 to a closed signal while maintaining the output of the cutoff signal SS4.

[0085] At this time, if the cutoff signal SS4 is properly output, even if the drive signal SS3 switches from the open signal to the closed signal, the signal output from the output driver 201B remains the open signal. On the other hand, when the cutoff signal SS4 is not properly output, when the drive signal SS3 switches from the open signal to the closed signal, the signal output from the output driver 201B switches to the closed signal. From this, the PCM201 determines whether or not the monitor signal SS2 has switched from the open signal to the closed signal as the drive signal SS3 switches to the closed signal. When the monitor signal SS2 has switched, it is determined that the cutoff signal SS4 is not properly output, that is, a command for forcibly opening this for the main contacts 71, 71 is not correctly output. On the other hand, when the monitor signal SS2 has switched, it is determined that the above command is correctly output.

[0086] Returning to the flowchart of FIG. 6, after starting the post-charging stop process, the PCM201 determines whether or not a predetermined reference time has elapsed since the start of the post-charging stop process (step S28). This reference time is set to be longer than the time spent on the post-charging stop process, and at the timing when the determination in step S27 becomes YES, all of the post-charging stop processes are completed. From this, when the determination in step S28 becomes YES, the PCM204 determines that the post-charging stop process has ended, and ends the post-charging end control. That is, it is determined that the post-charging end control has been completed (step S29). Note that the reference time is set in advance by experiments or the like and stored in the PCM201.

[0087] In this way, when the charging end condition is satisfied while the external charging start condition is not satisfied, the PCM201 performs the post-charging stop process. On the other hand, when the determination in step S26 is NO and the external charging start condition is satisfied, that is, when the charging end condition is satisfied as the external charging start condition is satisfied, the PCM201 ends the post-charging end control without performing the post-charging stop process (without performing steps S27 and S28), that is, it is determined that the post-charging end control has been completed (step S29).

[0088] Next, the control content of each controller when the external charging start condition is satisfied during the supplementary charging and the supplementary charging end condition is satisfied accordingly will be described with reference to FIG. 9.

[0089] Even when the supplementary charging is being performed, similar to when the supplementary charging is not being performed, when the PCM 201 receives a charging start signal from the DC charging connection device 50, it determines that the external charging start condition is satisfied, generates a CAN request signal for realizing CAN communication with the DC charger 312, and transmits this to the DC charger 312 (step S2).

[0090] On the other hand, when the supplementary charging is being performed when the external charging start condition is satisfied, unlike when the supplementary charging is not being performed, the PCM 201 starts the supplementary charging end control (step S4).

[0091] The PCM 201 first opens the main contacts 71, 71 (step S22). Next, the PCM 201 transmits a cutoff request signal to the supplementary charging device 20 to stop the supplementary charging device 20 (step S23). As described above, when the supplementary charging device 20 receives the cutoff request signal (step Q21), it performs a writing process (step Q22), and when the writing process is completed, it transmits a cutoff permission signal to the PCM 201 (step Q23). Then, when the cutoff permission signal is input from the supplementary charging device 20, the PCM 201 stops the supplementary charging device 20 (step S26).

[0092] Here, as described above, when the supplementary charging end condition is satisfied along with the satisfaction of the external charging start condition, the PCM 201 does not perform the supplementary charging stop post-processing. When the supplementary charging device 20 is stopped, it determines that the supplementary charging end control has ended (step S29). When the supplementary charging end control ends, the PCM 201 resumes the control for starting the external charging.

[0093] Specifically, the PCM 201 performs the above steps S5 to S9. That is, the PCM 201 transmits the pre-external charging information to the DC charger 312 via CAN communication (step S5), closes the main contacts 71, 71 and the QBC contacts 73, 73 (step S6), activates the charging device 20 (step S7), waits for the activation completion signal to be input from the charging device 20 (waits for the determination in step S8 to be YES), and transmits a charging start signal to the DC charger 312 to start external charging (step S9).

[0094] (Function, etc.) As described above, in the above embodiment, supplementary charging for charging the low-voltage battery 3 with the high-voltage battery 2 and external charging for charging the high-voltage battery 2 with an external power supply device 310 outside the vehicle are realized. Therefore, the charge amounts of both the high-voltage battery 2 and the low-voltage battery 3 can be ensured.

[0095] Also, when the external charging start condition is satisfied during the execution of the supplementary charging, after the charging device 20 is stopped, a charging start signal is transmitted to the DC charger 312 to start external charging. Therefore, it is possible to avoid interference between the control for performing the supplementary charging and the control for starting the external charging, and appropriately start the external charging.

[0096] Also, when the replenishment charge end condition is satisfied while the external charging start condition is not satisfied, after the replenishment charge device 20 stops, post-replenishment charge stop processing is performed, information deletion processing and re-calculation / re-acquisition processing are carried out, and a part of the PCM 201 is reset. Therefore, an opportunity to reset the PCM 201 can be ensured and the information of the PCM 201 can be appropriately updated. In particular, in the above embodiment, as post-replenishment charge stop processing, the abnormal determination result of the stored main contactor forced opening system is deleted, and then the abnormal determination is re-executed. Therefore, an opportunity to execute the abnormal determination of the main contactor forced opening system can be ensured. Also, as post-replenishment charge stop processing, battery information update processing (step S26C) is carried out, and information such as the latest battery SOC is sent to the PCM 201. Therefore, the PCM 201 can perform more appropriate control regarding the high-voltage battery 2.

[0097] However, if post-replenishment charge stop processing is carried out when the replenishment charge end condition is satisfied following the satisfaction of the external charging start condition, and external charging is started after the completion of this processing, the time from when the external charging start condition is satisfied until external charging starts becomes long.

[0098] In contrast, in the above embodiment, when the replenishment charge end condition is satisfied following the satisfaction of the external charging start condition, the post-replenishment charge stop processing is omitted. That is, at this time, the execution of the post-replenishment charge stop processing is prohibited. Therefore, it is possible to avoid the delay in the time when external charging starts by the time of the post-replenishment charge stop processing, and external charging can be started earlier.

[0099] Also, when signals for realizing CAN communication between the PCM 201 and the DC charger 312 are erased and updated (regenerated / resent) during the execution of the post-charging-stop process as in the above embodiment, if external charging is started without waiting for the completion of the process, the PCM 201 and the DC charger 312 cannot perform CAN communication, so pre-external-charging information is not input to the DC charger 312, and appropriate external charging may not be achieved. On the other hand, in the above embodiment, when the post-charging-stop process is prohibited when the supplementary charging end condition is satisfied as the external charging start condition is satisfied, CAN communication between the PCM 201 and the DC charger 312 can be maintained and appropriate external charging can be achieved. In other words, when signals for realizing CAN communication between the PCM 201 and the DC charger 312 are erased and updated (regenerated / resent) during the execution of the post-charging-stop process, it is necessary to wait for the completion of the process in order to achieve appropriate external charging, and the start time of external charging is delayed. On the contrary, since the post-charging-stop process is prohibited when the supplementary charging end condition is satisfied as the external charging start condition is satisfied, appropriate external charging can be achieved while preventing a delay in the start time of external charging.

[0100] Also, in the above embodiment, before stopping the charging device 20 when the supplementary charging end condition is satisfied, a writing process is performed, and information regarding the charging device 20, such as the determination result of the failure determination of the charging device 20, is written from the volatile memory 207B to the non-volatile memory 207C and stored. Therefore, even after the charging device 20 is stopped and the supplementary charging is completed, information regarding the charging device 20 can be continuously held by the charging device 20.

[0101] Here, the above writing process is also carried out when the supplementary charge end condition is satisfied along with the establishment of the external charging start condition. Therefore, also in this case, the information regarding the supplementary charging device 20 can be continuously held in the supplementary charging device 20. However, if the above writing process is carried out when the supplementary charge end condition is satisfied along with the establishment of the external charging start condition, the start time of the external charging is delayed by the time required for the writing process. However, in the above embodiment, since the delay of the external charging start time due to the omission of the post-external charging stop process is suppressed, even when the supplementary charge end condition is satisfied along with the establishment of the external charging start condition, while carrying out the writing process, it is possible to prevent the time from the establishment of the external charging start condition until the external charging starts from becoming excessively long.

[0102] Also, in the above embodiment, when the external charging start condition is satisfied, the main contacts 71, 71 are closed and the supplementary charging device 20 is activated to start the supplementary charging. That is, the supplementary charging is also carried out during the external charging. Therefore, it is possible to ensure the charge amounts of both the high-voltage battery 2 and the low-voltage battery 3 more reliably.

[0103] Also, in the above embodiment, when the external charging start condition is satisfied during the supplementary charging and accordingly the supplementary charge end condition is satisfied, after the main contacts 71, 71 are opened and the supplementary charging device 20 is stopped, the main contacts 71, 71 are closed and the supplementary charging device 20 is activated. Therefore, it is possible to prevent the control of opening the main contacts 71, 71 and stopping the supplementary charging device 20, which is carried out upon the end of the supplementary charging, from interfering with the control of closing the main contacts 71, 71 and activating the supplementary charging device 20 upon the start of the external charging.

[0104] (Modification example) In the above embodiment, the case where all of the post-supplementary charge stop processes are omitted (prohibited) when the external charging start condition is satisfied during the supplementary charging and accordingly the supplementary charge end condition is satisfied has been described. However, only some of the post-supplementary charge stop processes may be omitted (prohibited).

[0105] In the above-described first and second embodiments, the case where the off-vehicle power supply device that supplies power to the high-voltage battery 2 outputs a direct current has been described. However, the off-vehicle power supply device may output an alternating current.

[0106] Further, in the above embodiment, the case where both the volatile memory 207B and the non-volatile memory 207C are provided in the charging device 20 has been described. However, the volatile memory 207B and the non-volatile memory 207C may be provided in another controller (for example, the PCM 201). Further, the device that performs the writing process is not limited to the CPU 207A of the charging device 20.

Description of Reference Numerals

[0107] 2 High-voltage battery 3 Low-voltage battery 4 Motor 8 DC / DC converter 20 Charging device 30 High-voltage circuit 50 DC charging connection device 71 Main contactor (disconnection / connection device) 201 PCM (control device) 201B Output driver (forced opening command output device) 211 Determination unit 212 External charging control unit 213 Charging control unit 207A Volatile memory (temporary storage device) 207B Non-volatile memory (storage device) 207C CPU (writing processing device) 310 DC power supply device (power supply device) 312 DC charger (charger)

Claims

1. In a battery charging control device for a vehicle, comprising a motor as a drive source, a high-voltage battery that supplies power to the motor, a low-voltage battery having an output voltage lower than that of the high-voltage battery, and a charging connection device that is connected to a power supply device having a charger provided outside the vehicle and realizes external charging for charging the high-voltage battery by the power supply device, a supplementary charging device that performs supplementary charging for charging the low-voltage battery with the output power of the high-voltage battery; a control device that controls each device including the supplementary charging device; the control device includes: a determination unit that determines whether an external charging start condition, which is a condition for starting the external charging, is satisfied, and determines that a supplementary charging end condition, which is a condition for ending the supplementary charging, is satisfied when the external charging start condition is satisfied or another predetermined condition is satisfied during the supplementary charging; a supplementary charging control unit that stops the supplementary charging device when it is determined by the determination unit that the supplementary charging end condition is satisfied; an external charging control unit that issues a command to start the external charging to the charger when it is determined by the determination unit that the external charging start condition is satisfied; the external charging control unit issues the command to the charger after the supplementary charging device is stopped by the supplementary charging control unit when the external charging start condition is satisfied during the supplementary charging; the supplementary charging control unit includes: when the supplementary charging end condition is satisfied while the external charging start condition is not satisfied, after stopping the supplementary charging device, performs post-supplementary charging stop control for erasing and updating predetermined information held by the control device; when the supplementary charging end condition is satisfied with the establishment of the external charging start condition, restricts the execution of the post-supplementary charging stop control. A battery charging control device for a vehicle, characterized by the above.

2. In the battery charging control device for a vehicle according to Claim 1, the supplementary charging control unit includes: when performing the post-supplementary charging stop control, erases and updates a signal for realizing CAN communication between the control device and the charger; when the supplementary charging end condition is satisfied with the establishment of the external charging start condition, prohibits the execution of the post-supplementary charging stop control. A battery charging control device for a vehicle, characterized by the above.

3. In the battery charging control device for a vehicle according to Claim 1 or 2, A temporary storage device capable of storing information related to the supplementary charging device only during the operation of the supplementary charging device, A storage device capable of storing information related to the supplementary charging device both during and after the operation of the supplementary charging device, A writing processing device that performs a writing process of writing and storing the information stored in the temporary storage device in the storage device, and further includes: When the supplementary charging end condition is satisfied, the supplementary charging control unit stops the supplementary charging device after causing the writing processing device to perform the writing process. A battery charging control device for a vehicle, characterized by this.

4. In the battery charging control device for a vehicle according to any one of Claims 1 to 3, A disconnecting and connecting device capable of disconnecting and connecting the electrical connection between the high-voltage circuit including the low-voltage battery and the high-voltage battery, A forced opening command output device capable of outputting a forced opening command that is a command for forcibly opening the disconnecting and connecting device, and including: When performing post-charging stop control, the supplementary charging control unit determines whether or not the forced opening command is output from the forced opening command output device. A battery charging control device for a vehicle, characterized by this.

5. In the battery charging control device for a vehicle according to any one of Claims 1 to 3, A disconnecting and connecting device capable of disconnecting and connecting the electrical connection between the high-voltage circuit including the low-voltage battery and the high-voltage battery is provided, When the supplementary charging end condition is satisfied, before stopping the supplementary charging device, the supplementary charging control unit opens the disconnecting and connecting device, When the external charging start condition is satisfied, the external charging control unit stops the supplementary charging device after opening the disconnecting and connecting device, and when the external charging start condition is satisfied during the supplementary charging, after the disconnecting and connecting device is opened and the supplementary charging device is stopped by the supplementary charging control unit, the disconnecting and connecting device is closed and the supplementary charging device is started. A battery charging control device for a vehicle, characterized by this.

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