JP6631443B2 - vehicle - Google Patents

Description

  The present invention relates to a vehicle, and more particularly to a vehicle that receives power supply from a charging device outside the vehicle.

  Japanese Patent Laying-Open No. 2015-70661 (Patent Document 1) discloses a vehicle that receives power supply from a commercial power supply outside the vehicle. Electric power supplied from a commercial power supply is used for charging a power storage device mounted on a vehicle. Charging power for charging the power storage device is controlled in accordance with required power of the vehicle. In this vehicle, when the required power of the vehicle significantly changes during charging of the power storage device, a command value for controlling the charging power of the power storage device is changed stepwise. Therefore, the charging power of the power storage device changes gradually. According to this vehicle, even if the required power of the vehicle greatly changes, the charging power gradually changes due to the stepwise change of the command value, so that a small voltage fluctuation (flicker) occurs in the commercial power supply. Can be suppressed (see Patent Document 1).

JP 2015-70661 A

  In a vehicle that receives power supply from a charging device outside the vehicle, it is necessary to consider not only the required power of the vehicle but also the outputable current of the charging device when determining the charging power of the power storage device mounted on the vehicle. . The outputable current is, for example, the upper limit of the current that the charging device permits the output at a certain timing. For example, from the viewpoint of protection of the charging device, the charging power of the power storage device is smaller among the first command value set according to the outputtable current of the charging device and the second command value set according to the required power of the vehicle. It is conceivable to charge the power storage device in accordance with a certain command value.

  In such a case, if the first command value decreases rapidly, even if the second command value is reduced stepwise as in the vehicle disclosed in Patent Document 1, the charging of the power storage device is performed in the first manner. , The charging power of the power storage device sharply decreases. When the charging current is reduced to rapidly reduce the charging power, for example, the voltage drop due to the charging current is reduced and the voltage of the commercial power supply is rapidly increased. Flicker may occur in the commercial power supply due to such voltage fluctuation.

  The present invention has been made to solve such a problem, and an object of the present invention is to determine a charging power of a power storage device mounted on a vehicle according to an outputable current of the charging device and a required power of the vehicle. Is to suppress a rapid decrease in charging power.

  A vehicle according to the present invention includes a power storage device, a charger, and a control device. The charger is configured to charge the power storage device with electric power supplied from a charging device outside the vehicle. The control device is configured to output a first command value for controlling the charging current of the power storage device and a second command value for controlling the charging power of the power storage device to the charger. The control device sets the first command value according to the outputtable current of the charging device and sets the second command value according to the required power of the vehicle. The charger charges the power storage device according to the command value of the first and second command values that reduces the charging power of the power storage device. When decreasing the first command value more than the reference value, the control device decreases the second command value stepwise, and thereafter decreases the first command value.

  In this vehicle, when the first command value set in accordance with the outputtable current of the charging device is significantly reduced below the reference value, the first command value is set in accordance with the required power of the vehicle before the first command value decreases. The second command value to be performed is gradually reduced. Therefore, the charging power of the power storage device decreases stepwise according to the second command value before the first command value decreases. As a result, according to this vehicle, it is possible to suppress a rapid decrease in charging power.

  ADVANTAGE OF THE INVENTION According to this invention, in a vehicle which determines the charging power of the power storage device mounted in the vehicle according to the outputtable current of the charging device and the required power of the vehicle, it is possible to suppress a rapid decrease in the charging power.

It is a block diagram of a vehicle charging system. FIG. 7 is a diagram illustrating a change in charging power of the power storage device when the charging current command value is reduced in accordance with a reduction in outputable power of the charging station. FIG. 3 is a diagram showing output timing of a charging current command value and a change in charging power in a vehicle according to the present embodiment. It is a flowchart which shows the determination processing procedure of the charge command value output to a charger.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding portions have the same reference characters allotted, and description thereof will not be repeated.

[Vehicle configuration]
FIG. 1 is a configuration diagram of a vehicle charging system to which the vehicle according to the present embodiment is applied. Referring to FIG. 1, vehicle charging system 1 includes a vehicle 100, a charging stand 200, and a charging cable 300.

  AC power supply 400 is, for example, a system power supply. Charging stand 200 is a device that supplies power from AC power supply 400 to vehicle 100. A charging cable 300 is connected to the charging stand 200. A charging connector 310 is provided at the end of the charging cable 300.

  Vehicle 100 includes charging inlet 110, power storage device 120, charger 130, PCU (Power Control Unit) 140, and ECU (Electronic Control Unit) 150.

  The charging connector 310 is connected to the charging inlet 110. The user can charge power storage device 120 by connecting charging connector 310 to charging inlet 110.

  Power storage device 120 is a power storage element configured to be chargeable and dischargeable. Power storage device 120 is configured to include, for example, a secondary battery such as a lithium ion battery, a nickel hydride battery, or a lead storage battery, or a power storage element such as an electric double layer capacitor.

  Charger 130 converts AC power supplied from AC power supply 400 via charging inlet 110 to DC power. Then, charger 130 converts the voltage to a desired voltage and supplies the DC power after the voltage conversion to power storage device 120. Charger 130 includes, for example, a rectifier circuit that converts AC power into DC power, and a converter that converts voltage. Charger 130 is not limited to such a configuration. For example, charger 130 may be configured to supply DC power supplied from a power supply outside the vehicle to power storage device 120.

  PCU 140 includes a converter, an inverter, and the like. PCU 140 drives a traveling motor (not shown) by using electric power supplied from power storage device 120.

  ECU 150 incorporates a CPU (Central Processing Unit) and a memory (not shown), and controls each device (charger 130, PCU 140) of vehicle 100 based on information stored in the memory and information from each sensor (not shown). Control.

  ECU 150 outputs, for example, the following command values relating to charging of power storage device 120 to charger 130. As the command value, for example, a charging current command value (first command value) set according to the outputtable current of charging station 200 and a charging power command value (second command value) set according to the required power of vehicle 100 ). Information indicating the outputtable current of the charging station 200 is output from the charging station 200 to the ECU 150 via the charging cable 300 with the charging connector 310 connected to the charging inlet 110.

  The charging current command value is a value indicating the upper limit value of the charging current of power storage device 120. The charging power command value is a value indicating the charging power required by vehicle 100. Charger 130 charges power storage device 120 in accordance with the smaller one of the charging current command value and the charging power command value from among the charging current command value and the charging power command value.

[Suppression of flicker in AC power supply]
When the power storage device 120 is being charged by the power supplied from the charging station 200, the required power of the vehicle 100 may change rapidly. In such a case, if the charging power command value is rapidly changed in accordance with the change in the required power of vehicle 100, the charging power of power storage device 120 will be rapidly changed. As a result, the voltage of the AC power supply 400 may fluctuate rapidly, and flicker may occur in the AC power supply 400.

  In vehicle 100 according to the present embodiment, ECU 150 changes the charging power command value in a stepwise manner when the required power of vehicle 100 changes abruptly. In this case, since the charging power command value does not change rapidly, the charging power of power storage device 120 does not change rapidly. As a result, a sudden change in the voltage of the AC power supply 400 is suppressed, and the occurrence of flicker is suppressed.

  In determining the charging power of power storage device 120, not only the required power of vehicle 100 but also the outputtable current of charging station 200 is considered in vehicle 100. As described above, ECU 150 outputs to charger 130 a charging current command value set according to the outputtable current of charging station 200. Charger 130 charges power storage device 120 in accordance with the command value of the charging current command value and the charging power command value that reduces the charging power of power storage device 120.

  It is assumed that, in the vehicle 100, when the outputtable current of the charging station 200 sharply decreases, the charging current command value also sharply decreases. It is assumed that the charging power according to the charging current command value is smaller than the charging power according to the charging power command value. In this case, even if the charging power command value is decreased stepwise, charging of power storage device 120 is performed according to the charging current command value, and thus the charging power of power storage device 120 sharply decreases. When the charging current is reduced to rapidly reduce the charging power, for example, the voltage drop due to the charging current is reduced, and the voltage of the AC power supply 400 is rapidly increased. Flicker may occur in the AC power supply 400 due to such voltage fluctuation.

  FIG. 2 is a diagram illustrating a change in the charging power when the charging current command value is reduced in accordance with a reduction in the outputtable current of the charging station 200. Referring to FIG. 2, the horizontal axis represents time, and the vertical axis represents, from above, the outputtable current of charging station 200, a charging current command value output from ECU 150 to charger 130, and an output from ECU 150 to charger 130. And the actual charging power supplied to power storage device 120.

  At time t1, the outputtable current of charging station 200 sharply decreases from I2 to I1, so that ECU 150 decreases the charging current command value from I2 to I1. On the other hand, at time t1, ECU 150 does not reduce the charging power command value from P3 to P1 at once, but decreases the charging power command value from P3 to P2 because ECU 150 sharply decreases the charging power. . Then, at time t2, ECU 150 reduces the charging power command value from P2 to P1. That is, the charging power command value decreases stepwise.

  However, at time t1, the charging current command value has already decreased from I2 to I1. Since charging power P1 according to charging current command value I1 is smaller than charging power command value P2, charger 130 decreases charging power from P3 to P1 according to charging current command value I1. That is, the charging power does not follow the charging power command value. Therefore, at time t1, the charging power sharply decreases from P3 to P1. When the charging power rapidly decreases, flicker occurs in the AC power supply 400.

  Therefore, in vehicle 100 according to the present embodiment, in order to suppress the occurrence of such flicker, ECU 150 temporarily reduces the charging current command value as it is when the charging current command value is significantly reduced from the reference value. While maintaining, first, the charging power command value is reduced stepwise, and thereafter, the charging current command value is reduced. The “reference value” refers to, for example, a current at which the flicker occurs in the AC power supply 400 and the charging power according to the charging current command value becomes smaller than the charging power according to the charging power command value when the charging current is further reduced. Value.

  FIG. 3 shows a timing at which a charging current command value is output in vehicle 100 according to the present embodiment and a change in charging power. Referring to FIG. 3, similarly to FIG. 2, the horizontal axis represents time, and the vertical axis represents, from the top, the outputable current of charging station 200, charging current command value, charging power command value, and power storage device 120. Indicates charging power.

  At time t11, even if the outputtable current of charging station 200 rapidly decreases from I2 to I1, ECU 150 maintains the charging current command value at I2, which is the state before the reduction. On the other hand, from time t11 to time t12, ECU 150 gradually decreases the charging power command value. Then, at time t13 after the charging power command value has decreased to P1, ECU 150 decreases the charging current command value from I2 to I1.

  At time t11, the charging power command value decreases to P2 while the charging current command value is maintained at I2. Since the charging power according to the charging current command value I2 is larger than the charging power command value P2, the charger 130 reduces the charging power from P3 to P2 according to the charging power command value P2. That is, the charging power follows the charging power command value. At time t12, the charging power command value decreases from P2 to P1, and charger 130 reduces the charging power from P2 to P1 according to charging power command value P1.

  Therefore, in vehicle 100 according to the present embodiment, even if outputable current of charging station 200 sharply decreases, charging current command value does not immediately decrease, and during that time, charging power command value decreases stepwise. Therefore, the charging power of the power storage device 120 does not suddenly decrease. As a result, according to vehicle 100, flicker generated in AC power supply 400 can be suppressed.

[Charge command value determination processing procedure]
FIG. 4 is a flowchart showing a procedure for determining a charge command value (a charge current command value and a charge power command value) to be output to charger 130. Referring to FIG. 4, the process shown in this flowchart is repeatedly executed by ECU 150 while power storage device 120 is being charged by the electric power supplied from charging station 200.

  As described above, ECU 150 continuously receives information indicating an outputable current from charging station 200 in a state where charging connector 310 is connected to charging inlet 110. ECU 150 determines whether or not the amount of decrease in the outputtable current of charging station 200 is greater than reference value SV1 (step S100). The reference value SV1 is, for example, a current value at which the flicker occurs in the AC power supply 400 and the charging power according to the charging current command value becomes smaller than the charging power according to the charging power command value when the charging current further decreases. is there.

  When it is determined that the amount of decrease in the outputtable current of charging station 200 is equal to or smaller than reference value SV1 (NO in step S100), ECU 150 executes a normal charging command (step S110). In other words, in principle, ECU 150 immediately changes the charging current command value according to the change in the outputtable current of charging station 200, and immediately changes the charging power command value according to the change in the required power of vehicle 100. However, when the required power of vehicle 100 changes abruptly, ECU 150 changes the charging power command value stepwise in order to suppress the occurrence of flicker in AC power supply 400.

  When it is determined that the amount of decrease in the outputtable current of charging station 200 is greater than reference value SV1 (YES in step S100), ECU 150 gradually changes the charging power command value while maintaining the charging current command value as it is. It is lowered (step S120, times t11 and t12 in FIG. 3). Thereafter, ECU 150 determines whether or not the gradual reduction of the charging power command value has been completed (step S130). If it is determined that the stepwise reduction of the charging power command value has not been completed (NO in step S130), ECU 150 continues the stepwise reduction of the charging power command value.

  When it is determined that the stepwise reduction of the charging power command value has been completed (step S130), ECU 150 decreases the charging current command value in accordance with the reduction of the outputtable current of charging station 200 (step S140, time in FIG. 3). t13).

  As described above, in vehicle 100 according to the present embodiment, when reducing the charging current command value to be larger than the reference value, ECU 150 maintains the charging current command value in the state before the reduction, and sets the charging power command value , And then the charging current command value is reduced. In vehicle 100, even if the outputable current of charging station 200 suddenly decreases, the charging current command value does not immediately decrease and the charging power command value decreases stepwise during that time. Power does not drop sharply. As a result, according to vehicle 100, flicker generated in AC power supply 400 can be suppressed.

  In vehicle 100 according to the above-described embodiment, charging current command value is set according to the outputtable current of charging station 200. However, the charging current command value is not necessarily set in accordance with the outputtable current of the charging station 200. For example, ECU 150 may change the charging current command value regardless of the outputable current of charging station 200 in order to change the charging power of power storage device 120. Even in such a case, the ECU 150 reduces the charging power command value stepwise while maintaining the charging current command value in the state before the reduction when the charging current command value is significantly reduced from the reference value. Then, the charging current command value may be reduced. Thus, even when the charging current command value is changed regardless of the output current of charging station 200, flicker occurring in AC power supply 400 can be suppressed.

  The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1 vehicle charging system, 100 vehicle, 110 charging inlet, 120 power storage device, 130 charger, 140 PCU, 150 ECU, 200 charging stand, 300 charging cable, 310 charging connector, 400 AC power supply.

Claims (1)

A power storage device,
A charger configured to charge the power storage device with power supplied from a charging device outside the vehicle,
A control device configured to output a first command value for controlling a charging current of the power storage device and a second command value for controlling charging power of the power storage device to the charger; With
The control device sets the first command value according to the outputtable current of the charging device, and sets the second command value according to the required power of the vehicle,
The charger charges the power storage device according to a command value of the first and second command values that reduces charging power of the power storage device,
The control device, when decreasing the first command value more than a reference value, gradually decreases the second command value to a command value of the charger , and thereafter, the first command value The vehicle that lowers the value.

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