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 temporary storage device, a storage device, and a write processing device that performs a writing process to write information stored in the temporary storage device to the storage device and store the information are provided. When a supplementary charging termination condition is established in a state where an external charging start condition is not established, a supplementary charging device is stopped after causing the write processing device to perform the writing process. When the supplementary charging termination condition is established along with establishment of the external charging start condition, a command to start external charging is issued to a charger after the supplementary charging device is stopped, and the writing process by the write processing device is prohibited.SELECTED DRAWING: Figure 4

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 machine 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 an external power supply device using a charger outside the vehicle 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 in which the high-voltage battery charges the low-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 the above operation is performed until external charging starts becomes long when a condition for starting external charging is satisfied by the user operating a charger outside the vehicle, the user may feel discomfort. 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 and can prevent the time until external charging starts from becoming long.

Means for Solving the Problems

[0008] In response to the above problems, the inventors of the present application focused on the control sequence when ending the supplementary charging. When ending the supplementary charging, the supplementary charging device that realizes the supplementary charging is stopped. Here, information such as a failure of the supplementary charging device can only be obtained during the operation of the supplementary charging device. Therefore, when stopping the supplementary charging device, it is necessary to write the information related to the above supplementary charging device from a device that stores it only during the operation of the supplementary charging device to a device that can store it even after the supplementary charging device is stopped. However, the inventors of the present application found that the time required for this writing process is relatively long, and performing this writing process when ending the supplementary charging and then starting external charging is the main factor causing the delay in the time to start external charging. Based on the above findings, the inventors of the present application invented the following as a battery charging control device for a vehicle.

[0009] That is, the present invention relates to 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. The battery charging control device further includes: a supplementary charging device that performs supplementary charging for charging the low-voltage battery with the output power of the high-voltage battery; a temporary storage device that can store information regarding the supplementary charging device only during the operation of the supplementary charging device; a storage device that can store information regarding 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 the information stored in the temporary storage device into the storage device; and a control device that controls each device including the supplementary charging device and the writing processing device. The control device includes: a determination unit that determines whether or not 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; and a charging control unit that, when the supplementary charging end condition is satisfied while the external charging start condition is not satisfied, stops the supplementary charging device after causing the writing processing device to perform the writing process, and when the supplementary charging end condition is satisfied along with the satisfaction of the external charging start condition, issues a command to start the external charging to the charger after stopping the supplementary charging device and prohibits the writing process by the writing processing device. (Claim 1)

[0010] 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.

[0011] Moreover, when the supplementary charging end condition is satisfied while the external charging start condition is not satisfied, the information regarding the supplementary charging device is written into a storage device capable of storing the information even after the supplementary charging device stops, and then the supplementary charging device stops. Therefore, the above information can be continuously held even after the supplementary charging device stops.

[0012] Also, when the supplementary charging end condition is satisfied as the external charging start condition is satisfied, the supplementary charging device stops without performing the writing process and the supplementary charging ends, and then the external charging starts. Therefore, while suppressing interference between the control sequence for performing the supplementary charging and the control sequence for starting the external charging, it is possible to prevent the start time of the external charging from being delayed by the time of the writing process. Accordingly, while appropriately starting the external charging, it is possible to start the external charging earlier.

[0013] In the above configuration, preferably, when the supplementary charging end condition is satisfied, the charging control unit performs control after the supplementary charging stop, which erases and updates a plurality of information held by the control device after the supplementary charging device stops, and when the external charging start condition is satisfied during the supplementary charging, issues a command to start the external charging to the charger after the end of the control after the supplementary charging stop (Claim 2).

[0014] In this configuration, when the supplementary charging end condition is satisfied, a plurality of information held by the control device is erased and updated. Therefore, regardless of whether the external charging start condition is satisfied or not, the control device can be updated using the timing of ending the supplementary charging. Here, if the external charging is started after the execution of this information erasing control and update control, the start time of the external charging is delayed by the execution time of these controls. On the other hand, in the present invention, as described above, when the supplementary charging end condition is satisfied as the external charging start condition is satisfied, the above writing process is omitted, thereby suppressing the delay of the start time of the external charging. Thus, even when the supplementary charging end condition is satisfied as the external charging start condition is satisfied, it is possible to prevent the start time of the external charging from becoming excessively late while updating the control device.

[0015] In the above configuration, preferably, 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, and a forced opening command output device capable of outputting a forced opening command which is a command for forcibly opening the disconnecting and connecting device are provided, and the charging control unit determines whether or not the forced opening command is output from the forced opening command output device when implementing the post-charging stop control (Claim 3).

[0016] According to this configuration, by using the end timing of the supplementary 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 disconnecting and connecting device. And 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 omitting the above writing process. 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 becoming excessively late while making the above determination.

[0017] In the above configuration, preferably, 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, and when the supplementary charging end condition is satisfied, the charging control unit opens the disconnecting and connecting device, and when the external charging start condition is satisfied, the charging control unit closes the disconnecting and connecting device and starts the supplementary charging device to start the supplementary charging. When the external charging start condition is satisfied during the implementation of the supplementary charging, after opening the disconnecting and connecting device and stopping the supplementary charging device, the disconnecting and connecting device is closed and the supplementary charging device is started (Claim 4).

[0018] In this configuration, when the external charging start condition is satisfied, the disconnecting and connecting device is closed and the supplementary charging device is started to start the supplementary charging. That is, the supplementary charging is also implemented during the external charging. Therefore, it is possible to ensure the charge amounts of both the high-voltage battery and the low-voltage battery more reliably.

[0019] Also, 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 for opening the disconnection / connection device and stopping the supplementary charging device that is performed when the supplementary charging ends, and the control for closing the disconnection / connection device and starting the supplementary charging device that is performed when the external charging starts.

[0020] In the above configuration, preferably, an SOC calculation device for calculating a battery SOC which is the SOC of the high-voltage battery is provided, and when the charging control unit executes the control after the supplementary charging stops, it receives information on the latest battery SOC from the SOC calculation device (Claim 5).

[0021] According to this configuration, it is possible to cause the control device (charging control unit) to receive the latest battery SOC calculated by the SOC calculation device by utilizing the end timing of the supplementary charging. As a result, when starting external charging after the end of the supplementary charging, it becomes possible to appropriately control the charger using the latest battery SOC. And 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 omitting the above writing process. 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 becoming excessively late while causing the control device (charging control unit) to receive the latest battery SOC.

[0022] In the above configuration, preferably, when a predetermined reference time has elapsed after the charging control unit stops the supplementary charging device, it determines that the control after the supplementary charging stops has ended, and when the external charging start condition is satisfied during the execution of the supplementary charging, after determining that the control after the supplementary charging stops has ended, it issues a command to start the external charging to the charger (Claim 6).

[0023] According to this configuration, it is possible to start the external charging after the control after the supplementary charging stops has surely ended.

[0024] In the above configuration, preferably, a plurality of CAN communication devices including the charger capable of CAN communication with the control device are provided. When the supplementary charging end condition is satisfied, after the supplementary charging device stops, the charging control unit performs information erasure control for erasing a plurality of pieces of information including signals for realizing CAN communication between the control device and the CAN communication devices, and update control for updating the erased information. When the external charging start condition is satisfied during the supplementary charging, after the information erasure control ends and before the update control ends, a signal for realizing CAN communication between the control device and the charger is generated and transmitted to the charger, and a command for starting the external charging is issued to the charger (Claim 7).

[0025] According to this configuration, some information of the control device can be erased and updated by utilizing the end timing of the supplementary charging. Moreover, in this configuration, when the external charging start condition is satisfied during the supplementary charging, generation and transmission for realizing CAN communication between the control device and the charger are performed after the information erasure control ends and before the update control ends, and these CAN communications are started. That is, the CAN communication between the control device and the charger is started without waiting for other information to be updated by the update control. Therefore, while transmitting the information necessary for the external charging from the control device to the charger to realize the appropriate external charging, the external charging can be started earlier.

Effect of the Invention

[0026] As described above, according to the battery charging control device for a vehicle of the present invention, while enabling supplementary charging and external charging, it is possible to suppress the delay in the time when the external charging is started.

Brief Description of the Drawings

[0027]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0028] (Overall Configuration of the Vehicle) The battery charging control device of the vehicle according to the first 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 first embodiment. The vehicle 1 is, for example, a four-wheel automobile.

[0029] 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. The vehicle 1 also has a plurality of controllers including a microprocessor or the like for controlling each part of the vehicle 1.

[0030] (Battery) In the first 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 rows and 6 series rows, and these battery modules are connected in series. Also, in the first 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.

[0031] 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 in the high-voltage battery 2. Also, although not shown in the figure, a battery heater for raising the temperature of the battery module is provided in the high-voltage battery 2.

[0032] (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. Also, the high-voltage circuit 30 includes a high-voltage line 31 for connecting these electrical devices.

[0033] 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.

[0034] 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 a driving force transmission device 12.

[0035] The generator 5 is a power generation device for charging the high-voltage battery 2. The vehicle 1 of this first embodiment is a series hybrid vehicle. That is, the vehicle 1 is equipped with an engine 22 that drives the generator 5, and 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 a driving force transmission device 12, and the vehicle 1 can regenerate the energy during deceleration.

[0036] 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.

[0037] The DC / DC converter 8 is a device that steps down the input power and outputs it. 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.

[0038] 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. Note that in this first 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.

[0039] (Main contactor) A pair of main contacts 71, 71 are provided between the high-voltage battery 2 and the high-voltage circuit 30. The main contacts 71, 71 are contacts, 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 contact is closed, the two contacts are electrically connected and energized, and when the contact is opened, the two contacts are electrically disconnected and de-energized. The main contacts 71, 71 disconnect and connect the electrical connection between the high-voltage battery 2 and the high-voltage circuit 30. Specifically, one main contact 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 contact 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 contacts 71, 71 correspond to the "disconnecting and connecting device" in the claims.

[0040] (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. By electrically connecting the power supply device 310 and the high-voltage battery 2 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 performed 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.

[0041] 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.

[0042] The DC charging connection device 50 is connected to a 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-BCM 200 described later by a CAN-BUS. By fitting the DC charging connection device 50 and a DC connector, the C-BCM 200 and the DC charger 312 (DC power supply device 310) are connected so as to be CAN communicable.

[0043] 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 main contacts 71, 71. Note that one QBC contact 73 disconnects and connects the electrical connection between the positive electrode side line of the high-voltage circuit 30 and the positive electrode side line of the DC charging connection device 50, and the other QBC contact 73 disconnects and connects the electrical connection between the negative electrode side line of the high-voltage circuit 30 and the negative electrode side line of the DC charging connection device 50.

[0044] (Controller) FIG. 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 including a display and performing display of various information, etc., is mounted. The above PCM 201 corresponds to the "control device" in the claims, and the BECM 205 corresponds to the "SOC calculation device" in the claims.

[0045] 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.

[0046] 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.

[0047] The BECM205 performs various operations related to the high-voltage battery 2. Specifically, when the main contacts 71, 71 switch from the closed state to the open state and the electrical connection between the high-voltage battery 2 and the high-voltage circuit 30 is interrupted, the BECM205 calculates the initial value of the battery SOC, which is the SOC of the high-voltage battery 2, based on the detected values of the battery current sensor SN1 and the battery temperature sensor SN2. Also, until the main contacts 71, 71 switch from the closed state to the open state again, the BECM205 calculates the increase or decrease amount of the battery SOC per unit time based on the above detected values, and updates the battery SOC by integrating the increase or decrease amount with respect to the above initial value. Further, the BECM205 performs failure determination of the high-voltage battery 2, the battery current sensor SN1, and the battery temperature sensor SN2.

[0048] Each of the controllers 200 to 207 operates by 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 via CAN (Controller Area Network) communication.

[0049] As shown in FIG. 3 to be 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 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. The CPU 207A of the DC / DC control unit 207 corresponds to the "writing processing device" of the claims, the volatile memory 207B corresponds to the "temporary storage device" of the claims, and the non-volatile memory 207C corresponds to the "storage device" of the claims.

[0050] (Charge control) The control related to external charging and supplementary charging is mainly carried out by the PCM201. FIG. 3 is a control block diagram related to these controls. Functionally, the PCM201 includes a determination unit 211 that determines the success or failure of an external charging start condition, which is a condition for starting external charging, and a supplementary charging end condition, which is a condition for ending supplementary charging, and a charging control unit 212 that performs external charging start control for starting external charging and supplementary charging end control when ending supplementary charging.

[0051] 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, values detected by a battery SOC calculated by the BECM205, a battery current sensor SN1, and a battery temperature sensor SN2 input to the BECM205 are input to the PCM201.

[0052] The PCM201 is electrically connected to the main contacts 71, 71 and the QBC contacts 73, 73 respectively, and opens and closes them. Specifically, the PCM201 opens and closes these contacts 71, 73 by switching the supply and stop of power from the low-voltage battery 3 to each contact 71, 73.

[0053] 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.

[0054] The PCM201 communicates with the DC charger 312 via CAN communication 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 (auxiliary charging device 20) via CAN communication. That is, these C-BCM200, DC charger 312, and PCM201, and the ECM202, DMCM203, SGCM204, BECM205, and DC / DC control unit 207 (auxiliary charging device 20) are CAN communication devices that communicate with the PCM201 via CAN communication.

[0055] (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 content of each controller when starting external charging in a state where auxiliary charging is not being performed.

[0056] As shown in FIG. 4, first, the PCM201 determines whether or not 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.

[0057] 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.

[0058] 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 and perform post-supplementary charging stop processing (step S4).

[0059] 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 completed, the PCM 201 transmits pre-external charging information, which is information for more appropriately performing external charging, to the DC charger 312 via CAN communication (step S5).

[0060] 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 and 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 pre-external charging information. For example, when the maximum charging time has elapsed since the start of 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.

[0061] 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.

[0062] 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.

[0063] In the vehicle 1 of this first 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.

[0064] 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.

[0065] 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.

[0066] (Supplementary Charging End Control) Next, the control implemented 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 when ending supplementary charging in a state where the external charging start condition is not satisfied.

[0067] The PCM 201 first determines whether or not the supplementary charging end condition is satisfied (step S21).

[0068] In the first embodiment, when the external charging start condition is satisfied during the supplementary charging, the supplementary charging is terminated. From this, the PCM 201 determines that the supplementary charging end condition is satisfied when the external charging start condition is satisfied during the supplementary charging. Further, after the start of the supplementary charging, 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 supplementary charging 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.

[0069] When it is determined that the supplementary charging end condition is satisfied (when the determination in step S21 is YES), the PCM 201 opens the main contactors 71, 71 (step S22). That is, during the supplementary charging, the main contactors 71, 71 are closed, and in step S22, the main contactors 71, 71 are switched from the closed state to the open state.

[0070] Next, the PCM 201 determines whether or not the external charging start condition is satisfied (step S23). That is, it is determined whether or not it is the case where the supplementary charging end condition is satisfied with the establishment of the external charging start condition.

[0071] When the external charging start condition is not satisfied, the PCM 201 transmits a cutoff request signal to the supplementary charging device 20 to stop the supplementary charging device 20 (step S24).

[0072] As shown in FIG. 7, when receiving the cutoff request signal (step Q21), the supplementary charging device 20 performs a writing process of writing and storing the information regarding the supplementary charging device 20 stored in the volatile memory 207B in the non-volatile memory 207C (step Q22).

[0073] For example, when the CPU 207A of the charging device 20 is operating during the running of the vehicle 1 or during the charging process and the charging device 20 is in operation (when receiving power supply), it determines whether each part of the charging device 20, such as the DC / DC converter 8, is faulty 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.

[0074] When the above writing process is completed, the charging device 20 (CPU 207A) sends a cutoff permission signal that permits the stop of the charging device 20 to the PCM 201 (step Q23).

[0075] 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 S25 to become YES) and then proceeds to the next step S26.

[0076] In step S26, 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 (the DC / DC control unit 207 and the DC / DC converter 8).

[0077] On the other hand, when the determination in step S23 is NO and the charging is to be terminated as the external charging start condition is satisfied, the PCM 201 proceeds to step S26 without performing steps S24 and S25 and stops the charging device 20.

[0078] In this way, when the charging is terminated as the external charging start condition is satisfied, the above writing process in the charging device 20 and the signal exchange between the PCM 201 and the charging device 20 are omitted.

[0079] After step S26, the PCM 201 starts the post-charging stop process (step S27).

[0080] 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 calculations or the information (signals) obtained from other controllers, etc., and a re - calculation·re - acquisition process (update process, step S27B) of re - calculating (re - generating) or re - acquiring at least part of the erased information and updating it.

[0081] The PCM201 performs at least the following two processes as the above - mentioned reset process. (1) The PCM201 erases the information (signals) output to the CAN communication device to realize CAN communication, stops the CAN communication with the CAN communication device that was performing CAN communication, and then re - calculates (re - generates) the information (signals) to realize CAN communication and transmits it to the CAN communication device to resume the CAN communication with the CAN communication device. (2) The PCM201 erases the determination result of the abnormality determination of the main contactor forced opening system performed last time and the determination result that has been stored so far, and then performs the process of re - implementing the abnormality determination. The details of the abnormality determination of the main contactor forced opening system will be described later.

[0082] 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 in 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 these information from the BECM205, and updates the information stored so far.

[0083] Here, in step S22, the main contactors 71, 71 are switched from the closed state to the open state. From this, after the implementation of step S22, in the BECM205, the initial value of the battery SOC is calculated and updated based on the detection values of the battery current sensor SN1 and the battery temperature sensor SN2. By implementing the post-charging stop process, the updated battery SOC in the BECM205, that is, the latest battery SOC, is transmitted to the PCM201.

[0084] The abnormal determination of the main contactor forced opening system will be described with reference to FIG. 8.

[0085] As shown in FIG. 8, the PCM201 includes a microcomputer (including a CPU, memory, etc.) 201A and a system LSI201C for monitoring the microcomputer 201A. A signal SS5 indicating whether the microcomputer 201A is normal is output from the system LSI201C. The PCM201 has an output driver 201B that generates an output signal SS1 to the main contactors 71, 71. The main contactors 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 the normal drive signal SS3 for opening and closing the main contactors 71, 71, a cutoff signal SS4 for opening the main contactors 71, 71 is output from the microcomputer 201A. The above output driver 201B corresponds to the "forced opening command output device" in the claims.

[0086] When a signal indicating that the microcontroller 201A is normal is output from the system LSI 201C and the cutoff signal SS4 is not output from the microcontroller 201A, the output driver 201B outputs the drive signal SS3. From this, 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 microcontroller 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 microcontroller 201A, regardless of the drive signal SS3, the output driver 201B outputs a signal that forcibly opens the main contacts 71, 71. From this, in this case, the main contacts 71, 71 are forcibly opened regardless of the drive signal SS3.

[0087] The abnormality determination of the main contact forcible opening system is a process of determining whether the main contacts 71, 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 this can be correctly output from the output driver 201B to the main contacts 71, 71. This determination is performed for each of the system LSI 201C and the cutoff signal SS4. Hereinafter, the signal for opening the main contacts 71, 71 is referred to as an open signal, and the signal for closing and opening is referred to as a closed signal.

[0088] As a specific procedure for the abnormality determination regarding 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 microcontroller 201A is abnormal. Note that in step S22, the main contacts 71, 71 are open. That is, the drive signal SS3 has already become an open signal and this is maintained. Also, the PCM 201 stops the output of the cutoff signal SS4.

[0089] Next, the PCM 201 sets the drive signal SS3 to a closed signal while maintaining the output signal of the system LSI 201C as a signal when the microcontroller 201A is abnormal.

[0090] At this time, if the signal indicating that the microcomputer 201A is abnormal is properly output from the system LSI 201C, even if the drive signal SS3 is switched from the open signal to the closed signal, the signal output from the output driver 201B remains the open signal. On the other hand, if the signal indicating that the microcomputer 201A is abnormal is not properly output from the system LSI 201C, the output signal SS1 of the output driver 201B is switched to the closed signal when the drive signal SS3 is switched from the open signal to the closed signal. From this, the PCM 201 determines whether or not the monitor signal SS2 has been switched from the open signal to the closed signal as the drive signal SS3 is switched to the closed signal. When the monitor signal SS2 has been switched, it is determined that the signal indicating that the microcomputer 201A is abnormal is not properly output from the system LSI 201C, and that the command for forcibly opening the main contacts 71, 71 from the system LSI 201C is not correctly output. On the other hand, when the monitor signal SS2 has been switched as the drive signal SS3 is switched to the closed signal, the PCM 201 determines that the above command is correctly output.

[0091] As a specific determination procedure for the cutoff signal SS4, the PCM 201 first sets the drive signal SS3 to the open signal (and maintains it at the open signal) and outputs the cutoff signal SS4. At this time, the system LSI is made to output a signal when the microcomputer 201A is normal. Next, the PCM 201 sets the drive signal SS3 to the closed signal while maintaining the output of the cutoff signal SS4.

[0092] 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.

[0093] 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 a time longer than the time spent on the post-charging stop process. At the timing when the determination in step S28 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 (step S29), and ends the post-charging end control. The reference time is set in advance by experiments or the like and stored in the PCM201.

[0094] Next, the control contents of each controller when the external charging start condition is satisfied during charging and the charging end condition is satisfied accordingly will be described with reference to FIG. 9.

[0095] Even when charging is being performed, similar to when charging is not being performed, 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, and generates and transmits a CAN request signal to the DC charger 312 (step S2).

[0096] On the other hand, when the supplementary charging is being performed when the external charging start condition is satisfied, unlike the case where the supplementary charging is not being performed, the PCM 201 starts the supplementary charging end control (step S4).

[0097] First, the PCM 201 opens the main contacts 71, 71 in the same manner as at the normal end of supplementary charging (when the supplementary charging end condition is satisfied without the establishment of the external charging start condition) (step S22). On the other hand, when the supplementary charging end condition is satisfied along with the establishment of the external charging start condition, as described above, the above-described writing process in the supplementary charging device 20 and the signal exchange between the PCM 201 and the supplementary charging device 20 are omitted. Thus, after opening the main contacts 71, 71, the PCM 201 stops the supplementary charging device 20 (step S26).

[0098] Next, the PCM 201 starts the post-supplementary charging stop process (step S27). At this time, by performing the information erasure process (step 27A), the CAN request signal transmitted from the PCM 201 to the DC charger 312 is erased, and then, by performing the re-calculation / re-acquisition process 27B (step S27B), the CAN request signal is re-generated and re-transmitted to the DC charger 312. Thus, when the supplementary charging end condition is satisfied along with the establishment of the external charging start condition, the CAN communication between the PCM 201 and the DC charger 312 is temporarily stopped. Then, when the CAN request signal is re-generated and re-transmitted from the PCM 201 and the DC charger 312 re-receives this, the CAN communication between the PCM 201 and the DC charger 312 is restarted.

[0099] Also, after stopping the supplementary charging device 20, the PCM 201 performs the battery information update process (step S27C), which is one of the post-supplementary charging stop processes, to update the information of the high-voltage battery 2.

[0100] Also, when the external charging start condition is not satisfied, the PCM 201 starts the post-supplementary charging stop process, and when the reference time has elapsed, determines that the post-supplementary charging stop process has ended (step S29), and ends the supplementary charging end control.

[0101] The control after the supplementary charge stop control is completed (after it is determined that it is completed) is the same as the control for starting external charging when the external charging start condition is satisfied in a state where no supplementary charge is being performed. 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 by CAN communication (step S5), closes the main contacts 71, 71 and the QBC contacts 73, 73 (step S6), activates the supplementary charging device 20 (step S7), waits for the activation completion signal to be input from the supplementary charging device 20 (waits for the determination in step S8 to become YES), and transmits a charging start signal to the DC charger 312 to start external charging (step S9).

[0102] Here, the step of stopping the supplementary charging device 20 in step S26 above corresponds to the "stop control" in the claims, the information erasure process in step S27A above corresponds to the "information erasure control" in the claims, and the re-calculation / re-acquisition process in step S27B above corresponds to the "update control" in the claims. Also, the above supplementary charge stop post-processing (step S27) corresponds to the "control after supplementary charge stop" in the claims.

[0103] (Operations of the First Embodiment, etc.) As described above, in the first 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 the 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.

[0104] Also, when the external charging start condition is satisfied during the supplementary charging, after the completion of the supplementary charge end control including the control to stop the supplementary charging device 20, a charging start signal is transmitted to the DC charger 312 and external charging is started. Therefore, it is possible to appropriately start external charging by avoiding interference between the control for performing supplementary charging and the control for starting external charging.

[0105] Moreover, when the supplementary charging end condition is satisfied while the external charging start condition is not satisfied, a writing process is performed, and information regarding the supplementary charging device 20, such as the determination result of the failure determination of the supplementary charging device 20, is written from the volatile memory 207B to the non-volatile memory 207C and stored. Therefore, even after the supplementary charging device 20 is stopped and the supplementary charging is ended, the information regarding the supplementary charging device 20 can be continuously held by the supplementary charging device 20.

[0106] On the other hand, when the supplementary charging end condition is satisfied along with the satisfaction of the external charging start condition, the writing process is omitted. Therefore, it is possible to avoid wasting time on the writing process itself and the signal exchange (transmission and reception of the cut-off request signal and the cut-off permission signal) between the PCM 201 for performing the writing process and the supplementary charging device 20, and shorten the time from when the external charging start condition is satisfied until the external charging is started, so that the external charging can be started earlier. Accordingly, it is possible to prevent a situation in which the user feels uncomfortable because the external charging is not started for a relatively long time after the user performs an operation to start the external charging with respect to the DC power supply device 310.

[0107] Also, in the above-described first embodiment, when the supplementary charging end condition is satisfied, post-supplementary charging stop processing (step S27) is performed, and information erasure processing (step S27A) and recomputation / reacquisition processing (step S27B) are performed. Therefore, by using the timing of ending the supplementary charging, a part of the PCM 201 can be reset and the information held by the PCM 201 can be updated to the latest information.

[0108] In particular, in the above-described first embodiment, as post-supplementary charging stop processing, information (signal) for realizing CAN communication output to a CAN communication device that communicates with the PCM 201 is erased to stop the CAN communication between the PCM 201 and the CAN communication device, and then, the information (signal) for realizing CAN communication is recomputed (regenerated) and retransmitted to the PCM 201 to resume the CAN communication. Therefore, by using the timing of ending the supplementary charging, appropriate CAN communication between the PCM 201 and the CAN communication device can be established.

[0109] Also, in the first embodiment, as post-charging stop processing, the PCM 201 erases the abnormality determination result of the main contactor forced opening system that it has stored, and then re-performs the abnormality determination. Therefore, the opportunity to perform the abnormality determination of the main contactor forced opening system can be ensured.

[0110] Also, in the first embodiment, as post-charging stop processing, a process of transmitting the latest detected values of the battery SOC, the battery current sensor SN1, and the battery temperature sensor SN2 from the BECM 205 to the PCM 201 is performed. Therefore, subsequent control using these pieces of information can be appropriately performed by the PCM 201. In the first embodiment, as described above, these latest values are transmitted to the DC charger 312 as pre-external charging information, and the power output to the high-voltage battery 2 is adjusted based on this information. Therefore, the high-voltage battery 2 can be charged more appropriately.

[0111] Here, in the first embodiment, when the supplementary charging end condition is satisfied even when the external charging start condition is satisfied, the post-charging stop processing is also performed, and the external charging is started after waiting for the post-charging stop processing to end. Therefore, the start time of the external charging is delayed by the amount of the post-charging stop processing. However, as described above, in the first embodiment, when the external charging start condition is satisfied during the supplementary charging, the delay in the start time of the external charging is suppressed by omitting the writing process. Therefore, even when the supplementary charging end condition is satisfied as the external charging start condition is satisfied, by performing the post-charging stop processing and starting the external charging after the post-charging stop processing ends, it is possible to avoid the start time of the external charging from becoming excessively late, obtain the above-described effects obtained by performing the post-charging stop processing, and prevent interference between the post-charging stop processing and the control for starting the external charging.

[0112] Also, in the first embodiment, when the reference time has elapsed after stopping the supplementary charging device 20, it is determined that the post-supplementary charging stop process has ended. Therefore, external charging can be started after the post-supplementary charging stop process has surely ended, and it is possible to surely prevent interference between the post-supplementary charging stop process and the control for starting external charging.

[0113] Also, in the first 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 supplementary charging. That is, supplementary charging is also performed during external charging. Therefore, the charge amounts of both the high-voltage battery 2 and the low-voltage battery 3 can be more reliably ensured.

[0114] Also, in the first embodiment, when the external charging start condition is satisfied during the execution of supplementary charging and accordingly the supplementary charging end condition is satisfied, after the main contacts 71, 71 are opened and the supplementary charging device 20 is stopped by performing the supplementary charging end control, the main contacts 71, 71 are closed and the supplementary charging device 20 is activated. Therefore, it is possible to prevent interference between the control of opening the main contacts 71, 71 and stopping the supplementary charging device 20 that is performed when supplementary charging ends, and the control of closing the main contacts 71, 71 and activating the supplementary charging device 20 that is performed when external charging starts.

[0115] (Second Embodiment) In the first embodiment, when the external charging start condition is satisfied during the execution of supplementary charging and accordingly the supplementary charging end condition is satisfied, the case where a CAN request signal for the DC charger 312 is once generated and transmitted before the execution of the information erasure process has been described. However, the configuration may be such that the CAN request signal for the DC charger 312 is generated and transmitted for the first time after the end of the information erasure process. The battery charging control device for a vehicle according to the second embodiment configured in this way will be described with reference to FIG. 10. Note that the configurations not described below are the same in the first embodiment and the second embodiment.

[0116] Also in the second embodiment, similar to the first embodiment, when the PCM 201 receives a charging start signal from the DC charging connection device 50 (step S31), it determines that the external charging start condition is satisfied. However, in the second embodiment, the PCM 201 does not immediately generate and transmit a CAN request signal to the DC charger 312, and first starts replenishment charge end control (step S32).

[0117] Similar to the first embodiment, the PCM 201 first opens the main contacts 71, 71 (step S41). Next, it stops the replenishment charging device 20 (step S42). Next, the PCM 201 starts post-replenishment charge stop processing (step S43).

[0118] However, different from the first embodiment, in the second embodiment, the PCM 201 does not perform battery information update processing and only performs information deletion processing (step S43A) and recalculation / retrieval processing (step S43B).

[0119] Also, when the information erasure process (step S43A) is completed, the PCM 201 generates and transmits a CAN request signal to the DC charger 312 while performing the recalculation and reacquisition process (step S43B). That is, the PCM 201 does not wait for the recalculation and reacquisition of information (signals) such as the abnormality determination result of the main contactor forced opening system erased by the information erasure process to be completed, but first generates a CAN request signal for realizing CAN communication with the DC charger 312 and transmits this to the DC charger 312 to start CAN communication with the DC charger 312. After that, the PCM 201 performs the same control as steps S5, S6, S7, and S9 in the first embodiment to start external charging. That is, the PCM 201 transmits the pre-external charging information to the DC charger 312 by CAN communication (step S34), closes each contactor 71, 73 (step S35), starts the charging device 20 (step S36), waits for a start completion signal to be input from the charging device 20, and then sends a charging start signal to the DC charger 312 (step S37) to start external charging of the DC charger 312. Note that, as described above, since the battery update process is omitted, the PCM 201 transmits the information already stored as pre-external charging information to the DC charger 312.

[0120] (Operations, etc. of the Second Embodiment) As described above, in the second embodiment, generation and transmission of a CAN request signal from the PCM 201 to the DC charger 312 are performed only after the information erasure process is completed. If the CAN request signal for the DC charger 312 is generated and transmitted before the information erasure process is carried out, the CAN request signal is erased by the implementation of the information erasure process, and thus it has to be regenerated and retransmitted, which takes time. In contrast, according to the second embodiment, there is no need to regenerate and retransmit the CAN request signal, so the time for this regeneration and retransmission can be omitted. Therefore, the time from when the external charging start condition is satisfied until external charging starts can be made shorter. Furthermore, in the second embodiment, without waiting for the update process to end, CAN communication between the PCM 201 and the DC charger 312 is started and subsequent control (steps S33 to S37) necessary for starting external charging is carried out. Also, the battery information update process is omitted. Therefore, the time until external charging starts can be made even shorter. Note that the operational effects obtained by the same configuration as in the first embodiment can also be obtained in the second embodiment.

[0121] (Modification example) In the above first and second embodiments, the case where an external power supply device that supplies power to the high-voltage battery 2 outputs a direct current has been described, but the external power supply device may output an alternating current.

[0122] Also, 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, but the volatile memory 207B and the non-volatile memory 207C may be provided in another controller (for example, the PCM 201). Also, the device that performs the writing process is not limited to the CPU 207A of the charging device 20.

Description of reference numerals

[0123] 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 Contact (Disconnection / Connection Device) 201 PCM (Control Device) 201B Output Driver (Forced Opening Command Output Device) 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 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; 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 a control device that controls each device including the supplementary charging device and the writing processing device, wherein the control device determines whether 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, a determination unit that determines that a supplementary charging end condition, which is a condition for ending the supplementary charging, is satisfied; a charging control unit that, when the supplementary charging end condition is satisfied in a state where the external charging start condition is not satisfied, stops the supplementary charging device after causing the writing processing device to perform the writing process, and when the supplementary charging end condition is satisfied with the establishment of the external charging start condition, issues a command to start the external charging to the charger after stopping the supplementary charging device and prohibits the writing process by the writing processing device. 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, wherein the charging control unit when the supplementary charging end condition is satisfied, performs post-supplementary charging stop control for erasing and updating a plurality of information held by the control device after stopping the supplementary charging device, and when the external charging start condition is satisfied during the supplementary charging, issues a command to start the external charging to the charger after the end 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 2, 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, and a forced opening command output device capable of outputting a forced opening command which is a command for forcibly opening the disconnecting and connecting device. The charging control unit determines whether or not the forced opening command is output from the forced opening command output device when performing the post-charging stop control. A battery charging control device for a vehicle is characterized by this.

4. In the battery charging control device for a vehicle according to claim 2, 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, and the charging control unit, when the charging end condition is satisfied, opens the disconnecting and connecting device, when the external charging start condition is satisfied, closes the disconnecting and connecting device and starts the charging device to start the charging, when the external charging start condition is satisfied during the charging, after opening the disconnecting and connecting device and stopping the charging device, closes the disconnecting and connecting device and starts the charging device. A battery charging control device for a vehicle is characterized by this.

5. In the battery charging control device for a vehicle according to any one of claims 2 to 4, an SOC calculation device for calculating a battery SOC which is the SOC of the high-voltage battery is provided, and the charging control unit receives the information of the latest battery SOC from the SOC calculation device when performing the post-charging stop control. A battery charging control device for a vehicle is characterized by this.

6. In the battery charging control device for a vehicle according to any one of claims 2 to 5, the charging control unit, when a predetermined reference time has elapsed after stopping the charging device, determines that the post-charging stop control has ended, when the external charging start condition is satisfied during the charging, after determining that the post-charging stop control has ended, issues a command to start the external charging to the charger. A battery charging control device for a vehicle is characterized by this.

7. In the battery charging control device for a vehicle according to claim 1, a plurality of CAN communication devices including the charger capable of CAN communication with the control device are provided, and the charging control unit, When the supplementary charging end condition is satisfied, after the supplementary charging device stops, information erasure control for erasing a plurality of information including signals for realizing CAN communication between the control device and the CAN communication device, and update control for updating the erased information are performed. When the external charging start condition is satisfied during the supplementary charging, after the information erasure control ends and before the update control ends, a signal for realizing CAN communication between the control device and the charger is generated and transmitted to the charger, and a command for starting the external charging is issued to the charger. A battery charging control device for a vehicle, characterized by this.

Images