JP2020078185A - vehicle - Google Patents

Abstract

To charge a power storage device with target charging power while protecting two chargers.SOLUTION: A vehicle 20 includes a power storage device 22, two chargers 26a and 26b parallel connected to the power storage device and an external power supply side 92, and a control device 40 that controls the two chargers. In a case in which the power storage device is charged using power from an external power supply, when the target charging power of the power storage device is a first threshold or more, or the target charging power is less than the first threshold and the output current of the external power supply is a second threshold value or more, the control device drives two chargers in parallel such that the power storage device is charged with the target charging power, and when the target charging power is less than the first threshold and the input current is less than the second threshold, the control device drives only one of the two chargers so that the power storage device is charged with the target charging power.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle.

  Conventionally, as this type of vehicle, a vehicle in which two chargers are connected in parallel to a battery and a charging plug has been proposed (for example, see Patent Document 1). In this vehicle, when the charging plug is connected to the AC power supply and the power from the AC power supply is used to charge the battery, the maximum output power of the two chargers that is higher than the target charging power to be supplied to the battery. And a charger having a maximum output power higher than the target charging power is independently operated to charge the battery by operating only one charger having a maximum output power higher than the target charging power. Is not present, the two chargers are operated in parallel to charge the battery.

JP, 2014-23426, A

  In such a vehicle, when the output voltage (system voltage) of the AC power supply becomes low due to voltage fluctuation or the like, in order to charge the battery with the target charging power, the input current of the charging device having two chargers (the output current of the AC power supply) ) Must be increased (requesting the AC power supply side to increase the output current). If the input current of the charging device becomes large while only one charger is operated independently to charge the battery, the heat generation of the charger during the independent operation becomes excessively large, which affects the life of the charger. I have a concern.

  The vehicle of the present invention mainly aims to charge the power storage device with the target charging power while protecting the two chargers of the charging device.

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

The vehicle of the present invention is
A power storage device,
A charging device having two chargers connected in parallel to the power storage device and the external power source side;
A controller for controlling the two chargers,
A vehicle comprising:
The control device is
When charging the power storage device using electric power from the external power source,
When the target charging power of the power storage device is a first threshold value or more, and when the target charging power is less than the first threshold value and the input current of the charging device is a second threshold value or more, the power storage is performed with the target charging power. Driving the two chargers in parallel so that the device is charged,
When the target charging power is less than the first threshold and the input current of the charging device is less than the second threshold, one of the two chargers is set so that the power storage device is charged with the target charging power. Drive only
That is the summary.

  In the vehicle of the present invention, when the power storage device is charged using the power from the external power source, the target charge power of the power storage device is equal to or higher than the first threshold value, and the target charge power is less than the first threshold value and the charge is performed. When the input current of the device is greater than or equal to the second threshold, the two chargers are driven in parallel so that the power storage device is charged with the target charging power, the target charging power is less than the first threshold, and the input current of the charging device is less than the first threshold. When it is less than two thresholds, only one of the two chargers is driven so that the power storage device is charged with the target charging power. Thus, in the former case, the power storage device can be charged with the target charging power while protecting the two chargers of the charging device. In the latter case, the power storage device can be charged with the target charging power while reducing the total loss of the charging device. Here, as the “input current of the charging device”, a value detected by a current sensor provided on the vehicle side may be used, or when the output current of the external power supply and the input current of the charging device are substantially equal to each other. Alternatively, the value detected by the current sensor provided on the external power supply side may be acquired by communication and used.

It is a block diagram which shows the outline of a structure of the vehicle 20 and the charging equipment 90 as one Example of this invention. 6 is a flowchart showing an example of a drive mode selection routine executed by vehicle ECU 40. It is explanatory drawing which shows the relationship between the target charging electric power Pch * of the battery 22, the input current Iin of the charging device 26, and the drive mode of the chargers 26a and 26b. It is explanatory drawing which shows the relationship between the target charge electric power Pch * of the battery 22, the input voltage Vin of the charging device 26, and the drive mode of the chargers 26a and 26b.

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

  FIG. 1 is a configuration diagram showing an outline of a configuration of a vehicle 20 and a charging facility 90 as an embodiment of the present invention. As shown in the figure, the vehicle 20 of the embodiment is configured as an electric vehicle or a hybrid vehicle having a motor for traveling, and has a battery 22 as a power storage device, a vehicle-side connector 24, a charging device 26, and a vehicle. An electronic control unit (hereinafter referred to as “vehicle ECU”) 40. The charging facility 90 includes an AC power source 92 as an external power source, a facility-side connector 94, and a charging facility electronic control unit (hereinafter, referred to as “facility ECU”) 98. Hereinafter, they will be described in order.

  Each component of the vehicle 20 will be described. The battery 22 is configured as, for example, a lithium ion secondary battery or a nickel hydrogen secondary battery, and is connected to a traveling motor via a power line. The vehicle side connector 24 is configured to be connectable to the facility side connector 94 of the charging facility 90.

  The charging device 26 has two chargers 26a and 26b connected in parallel to each other with respect to the first power line 23 to which the battery 22 is connected and the second power line 25 to which the vehicle-side connector 24 is connected. The two chargers 26a and 26b are configured to have the same specifications, and convert the power of the second power line 25 (AC power from the charging facility 90) into DC power and further convert the voltage to the first power supply. The power line 23 (battery 22) can be supplied. A current sensor 27 for detecting an input current Iin of the charging device 26 is attached to the positive electrode side line of the second power line 25. Further, a voltage sensor 28 for detecting the input voltage Vin of the charging device 26 is attached to the second power line 25.

  Although not shown, the vehicle ECU 40 is configured as a microprocessor including a CPU, and in addition to the CPU, includes a ROM that stores a processing program, a RAM that temporarily stores data, an input / output port, and a communication port. Prepare Signals from various sensors are input to the vehicle ECU 40 via an input port. Examples of the signal input to the vehicle ECU 40 include the input current Iin of the charging device 26 from the current sensor 27 and the input voltage Vin of the charging device 26 from the current sensor 30. Further, the charging current Ib of the battery 22 from a current sensor (not shown) attached to the output terminal of the battery 22, the voltage Vb of the battery 22 from a voltage sensor (not shown) attached between the terminals of the battery 22, and the battery 22 are attached to the battery 22. The temperature Tb of the battery 22 from the provided temperature sensor can also be mentioned. From the vehicle ECU 40, control signals to the chargers 26a and 26b of the charging device 26 are output via the output port. The vehicle ECU 40 calculates the storage ratio SOC of the battery 22 based on the charging current Ib of the battery 22 from a current sensor (not shown), and the calculated storage ratio SOC of the battery 22 and the temperature Tb of the battery 22 from a temperature sensor (not shown). I / O limits Win and Wout of the battery 22 are calculated based on The charge ratio SOC is the ratio of the capacity of the power that can be discharged from the battery 22 to the total capacity of the battery 22, and the input / output limits Win and Wout are the allowable input / output power that may charge and discharge the battery 22. The vehicle ECU 40 can communicate with the equipment ECU 98 of the charging equipment 90 by wire or wirelessly.

  Next, each component of the charging facility 90 will be described. The AC power supply 92 is installed in a house, a charging station, or the like, and is configured to be able to supply AC power to the vehicle 20. The equipment-side connector 94 is connected to the AC power supply 92 and is configured to be connectable to the vehicle-side connector 24 of the vehicle 20. A current sensor 93 is attached to the positive electrode side line of the power line that connects the AC power source 92 and the equipment side connector 94.

  Although not shown, the facility ECU 98 is configured as a microprocessor centered on a CPU, and in addition to the CPU, includes a ROM that stores a processing program, a RAM that temporarily stores data, an input / output port, and a communication port. Prepare Signals from various sensors, for example, the output current Is of the AC power supply 92 from the current sensor 93 and the like are input to the facility ECU 98 via the input port. The equipment ECU 98 outputs a control signal to the AC power source 92 via the output port. As described above, the facility ECU 98 can communicate with the vehicle ECU 40 in a wired or wireless manner.

  In the vehicle 20 and the charging facility 90 of the embodiment thus configured, the vehicle-side connector 24 of the vehicle 20 and the facility-side connector 94 of the charging facility 90 are connected at home or at a charging station or the like to instruct charging of the battery 22. Then, external charging for charging the battery 22 using the electric power from the charging facility 90 (AC power supply 92) is executed. In the external charging, the vehicle ECU 40 of the vehicle 20 sets the target charging power Pch * of the battery 22 based on the voltage Vb of the battery 22, the storage ratio SOC, and the input limit Win and transmits it to the equipment ECU 98 of the charging equipment 90. Then, the facility ECU 98 controls the AC power supply 92 so that the power corresponding to the target charging power Pch * is supplied to the vehicle 20, and the vehicle ECU 40 uses the power from the AC power supply 92 to charge the battery 22 by the target charge. A one-sided drive mode in which only one of the chargers 26a and 26b is driven or a parallel drive mode in which both of the chargers 26a and 26b are driven are selected and executed so that they are charged with the power Pch *. In this way, the battery 22 is charged. In the one-sided drive mode, a predetermined charger of the chargers 26a and 26b may be driven, or the charger to be driven may be switched at predetermined time intervals. In the parallel drive mode, the chargers 26a and 26b may be driven so that the power distribution ratio of the chargers 26a and 26b is, for example, 1: 1. Then, the vehicle ECU 40 ends the one-side drive mode or the parallel drive mode when the power storage ratio SOC of the battery 22 reaches a predetermined ratio Sref (for example, about 80% to 90%) or more. This completes the charging of the battery 22.

  Next, the operation of the vehicle 20 of the embodiment thus configured, particularly the operation of selecting the drive mode of the chargers 26a and 26b of the charging device 26 from the one-side drive mode and the parallel drive mode will be described. FIG. 2 is a flowchart showing an example of a drive mode selection routine executed by the vehicle ECU 40. This routine is repeatedly executed during external charging.

  When the drive mode setting routine of FIG. 2 is executed, the vehicle ECU 40 inputs the target charging power Pch * of the battery 22 set in the above process and the input current Iin of the charging device 26 from the current sensor 27 (step S100). Then, the target charging power Pch of the battery 22 is compared with the threshold value Pchref (step S110), and the input current Iin of the charging device 26 is compared with the threshold value Iinref (step S120). Here, the threshold value Pchref is a threshold value used to determine whether or not the battery 22 can be fully charged with the target charging power Pch * by one-sided driving, and is determined based on the allowable power of the chargers 26a and 26b. The threshold value Iinref is a threshold value used to determine whether or not there is a concern that an excessive current will flow to the charger 26a, 26b that is being driven when the one-sided drive is executed, and the chargers 26a, 26b. It is determined based on the allowable current of.

  When the target charging power Pch * of the battery 22 is greater than or equal to the threshold Pchref in step S110, or the target charging power Pch * of the battery 22 is less than the threshold Pchref in step S110, and the input current Iin of the charging device 26 is greater than or equal to the threshold Ichref in step S120. In the case of, the parallel drive mode is selected as the drive mode of the chargers 26a and 26b (step S130), and this routine is finished.

  When the output voltage (system voltage) of the AC power supply 92, that is, the input voltage Vin of the charging device 26 becomes low due to voltage fluctuation or the like, in order to charge the battery 22 with the target charging power Pch *, the input current Iin of the charging device 26 is required. (For that reason, the charging facility 90 is required to increase the output from the AC power supply 92). If the input current Iin of the charging device 26 becomes large during execution of the one-sided drive mode, heat generation of the charger 26a, 26b during driving becomes excessively large, which may affect the life of the charger. .. On the other hand, in the embodiment, in addition to when the target charging power Pch * of the battery 22 is the threshold Pchref or more, the target charging power Pch * of the battery 22 is less than the threshold Pchref and the input current Iin of the charging device 26 is the threshold. The parallel drive mode is also executed when Iinref or more. As a result, the battery 22 can be charged with the target charging power Pch * while protecting the chargers 26a and 26b.

  When the target charging power Pch * of the battery 22 is less than the threshold value Pchref in step S110 and the input current Iin of the charging device 26 is less than the threshold value Iinref in step S120, the one-sided driving mode is selected as the driving mode of the chargers 26a and 26b. (Step S140), this routine is ended. In this case, the battery 22 can be charged with the target charging power Pch * while reducing the total loss of the charging device 26 as compared with the parallel drive mode.

  FIG. 3 is an explanatory diagram showing the relationship between the target charging power Pch * of the battery 22, the input current Iin of the charging device 26, and the drive modes of the chargers 26a and 26b. As shown in the figure, the parallel drive mode is executed in a region where the target charging power Pch * of the battery 22 is equal to or higher than the threshold Pchref or in a region where the input current Iin of the charging device 26 is equal to or higher than the threshold Iinref. As a result, the battery 22 can be charged with the target charging power Pch * while protecting the chargers 26a and 26b. In the region where the target charging power Pch * of the battery 22 is less than the threshold value Pchref and the input current Iin of the charging device 26 is less than the threshold value Iinref, the one-side drive mode is executed. This makes it possible to charge the battery 22 with the target charging power Pch * while reducing the total loss of the charging device 26 as compared to the parallel drive mode.

  In the vehicle 20 of the embodiment described above, during external charging, when the target charging power Pch * of the battery 22 is equal to or higher than the threshold Pchref, or when the target charging power Pch * of the battery 22 is less than the threshold Pchref, the input of the charging device 26 is performed. When the current Iin is equal to or higher than the threshold value Iinref, the parallel drive mode is selected and executed from the one-side drive mode in which only one of the chargers 26a and 26b is driven and the parallel drive mode in which both of the chargers 26a and 26b are driven. As a result, the battery 22 can be charged with the target charging power Pch * while protecting the chargers 26a and 26b. During external charging, when the target charging power Pch * of the battery 22 is less than the threshold value Pchref and the input current Iin of the charging device 26 is less than the threshold value Iinref, the one side driving mode is selected from the one side driving mode and the parallel driving mode. Then run. As a result, the battery 22 can be charged with the target charging power Pch * while reducing the total loss of the charging device 26.

  In the vehicle 20 of the embodiment, the vehicle ECU 40 uses the input current Iin of the charging device 26 detected by the current sensor 27 when the drive mode of the chargers 26a and 26b is selected from the one-side drive mode and the parallel drive mode. However, in the case of a hardware configuration in which the input current of the charging device 26 and the output current of the external power supply 92 are substantially equal (see FIG. 1), the output current Is of the AC power supply 92 detected by the current sensor 93 is set to the equipment ECU 98. May be obtained by communication from the company and used.

  In the vehicle 20 of the embodiment, during external charging, the drive modes of the chargers 26a and 26b are changed from the one-side drive mode and the parallel drive mode based on the target charge power Pch * of the battery 22 and the input current Iin of the charging device 26. Decided to choose. However, the drive mode of the chargers 26a and 26b may be selected from the one-side drive mode and the parallel drive mode based on the target charging power Pch * of the battery 22 and the input voltage Vin of the charging device 26. FIG. 4 shows the relationship between the target charging power Pch * of the battery 22, the input voltage Vin of the charging device 26, and the drive modes of the chargers 26a and 26b in this case. In FIG. 4, the threshold Vinref is determined based on the above-mentioned threshold Iinref. The input current Iin and the input voltage Vin of the charging device 26 are generally “Iin = Pch / Vin” using the actual charging power Pch of the battery 22 and the total efficiency η of the charger 26a, 26b that is being driven. / Η ”. Therefore, if the input voltage Vin of the charging device 26 is known, it is possible to estimate what the input current Iin of the charging device 26 will be. Therefore, instead of the input current Iin of the charging device 26, the input voltage Vin of the charging device 26 may be used. When the input voltage of the charging device 26 and the output voltage of the external power supply 92 are substantially equal (see FIG. 1), the output voltage of the external power supply 92 may be used instead of the input voltage Vin of the charging device 26. ..

  Correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem will be described. In the embodiment, the battery 22 corresponds to a "power storage device", the chargers 26a and 26b correspond to "two chargers", and the vehicle ECU 40 corresponds to a "control device".

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the section of means for solving the problem. This is an example for specifically explaining the mode for carrying out the invention, and does not limit the elements of the invention described in the column of means for solving the problem. That is, the interpretation of the invention described in the column of means for solving the problem should be made based on the description in that column, and the embodiment is the invention of the invention described in the column of means for solving the problem. This is just a specific example.

  Although the embodiments for carrying out the present invention have been described above with reference to the embodiments, the present invention is not limited to these embodiments, and various embodiments are possible within the scope not departing from the gist of the present invention. Of course, it can be implemented.

  INDUSTRIAL APPLICABILITY The present invention can be used in the vehicle manufacturing industry and the like.

  20 vehicle, 22 battery, 23 first power line, 24 vehicle side connector, 25 second power line, 26 charging device, 26a, 26b charger, 27 current sensor, 28 voltage sensor, 40 vehicle ECU, 90 charging facility, 92 AC power supply, 94 facility side connector, 98 facility ECU, 93 current sensor.

Claims (1)

A power storage device,
A charging device having two chargers connected in parallel to the power storage device and the external power source side;
A controller for controlling the two chargers,
A vehicle comprising:
The control device is
When charging the power storage device using electric power from the external power source,
When the target charging power of the power storage device is a first threshold value or more, and when the target charging power is less than the first threshold value and the input current of the charging device is a second threshold value or more, the power storage is performed with the target charging power. Driving the two chargers in parallel so that the device is charged,
When the target charging power is less than the first threshold and the input current of the charging device is less than the second threshold, one of the two chargers is set so that the power storage device is charged with the target charging power. Drive only
vehicle.

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