JP2015171180A - vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a sudden change in the electric power being supplied to other electrical equipment connected to a power source outside a vehicle, when starting an on-vehicle battery charge by using the power source outside the vehicle.SOLUTION: In a vehicle that can be charged from outside to charge an on-vehicle battery by using a system power source outside the vehicle, at the time of starting a power supply from outside, when increasing a charging power command value Pcom (that is, the power supplied from the system power source to the battery) from zero (0) to a charging power target value Ptag, an ECU keeps the charging power command value Pcom to a power level between zero (0) and the charging power target value Ptag for a prescribed period. After the prescribed period has passed, the charging power command value Pcom is increased to the charging power target value Ptag.

Description

  The present invention relates to a vehicle capable of charging an in-vehicle battery using a power source external to the vehicle.

  Japanese Patent Laying-Open No. 2013-38832 (Patent Document 1) discloses a charging system for charging an in-vehicle battery using a power source external to the vehicle.

JP 2013-38832 A

  However, when charging a vehicle-mounted battery using a system power source installed in a house such as a house, if a large amount of power is suddenly supplied from the system power source to the vehicle side, other electrical devices connected to the system power source There is a risk that the power supplied to the abruptly changes, for example, the brightness of a light bulb in a house changes.

  The present invention has been made in order to solve the above-described problems, and its object is to connect to a power source external to the vehicle at the start of external charging for charging an in-vehicle battery using a power source external to the vehicle. It is to suppress the sudden change in the power supplied to other electrical devices.

  A vehicle according to the present invention is a vehicle capable of external charging in which an in-vehicle battery is charged with external power supplied from a power supply external to the vehicle, the charging inlet connected to the power supply external to the vehicle, the charging inlet, and the battery And a control device for controlling charging power supplied to the battery by controlling the charger. When increasing the charging power from the first power to the second power at the start of external charging, the control device maintains the charging power at a third power between the first power and the second power for a predetermined period, After the elapse of time, the charging power is increased to the second power.

  According to the present invention, at the start of external charging, the electric power supplied from the power supply outside the vehicle to the vehicle side is increased stepwise. Therefore, it is possible to suppress a sudden change in the electric power supplied to another electrical device connected to a power source outside the vehicle at the start of external charging.

It is a figure which shows the structure of a vehicle typically. It is a flowchart which shows the flow of a process in case ECU performs external charging. It is the figure which illustrated the change of the system voltage when starting and stopping external charge.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

  FIG. 1 is a diagram schematically illustrating the configuration of the vehicle 1. The vehicle 1 includes a charging system for performing external charging for charging the in-vehicle battery 30 using the system power supply 200 outside the vehicle.

  This charging system includes a charging inlet 10, a charger 20, and an ECU (Electronic Control Unit) 40.

  The charging inlet 10 is a power interface for receiving power (hereinafter referred to as “external power”) supplied from the system power supply 200 installed in the house. Charging inlet 10 is configured to be connectable to charging connector 210 connected to system power supply 200.

  The charger 20 is electrically connected to the charging inlet 10 and the battery 30. Based on a control signal from ECU 40, charger 20 converts external power received by charging inlet 10 into electric power that can charge battery 30 and outputs the electric power to battery 30. Thereby, external charging is performed.

  Further, although not shown, the vehicle 1 detects various physical quantities necessary for external charging, such as a sensor for monitoring the state of the battery 30 (temperature, current, voltage, stored amount, etc.). A plurality of sensors are provided.

  The ECU 40 includes a CPU (Central Processing Unit) and a memory (not shown). The ECU 60 executes predetermined calculation processing based on information from each sensor and information stored in the memory, sets a charging power command value Pcom based on the calculation result, and supplies power to the battery 30 by external charging. Charger 20 is controlled such that (hereinafter also referred to as “charging power P”) becomes charging power command value Pcom.

  In addition to the charging connector 210, the system power source 200 is connected to an electrical device (such as a light bulb) used in a house.

  In the vehicle 1 having the above-described configuration, when large electric power is suddenly supplied from the system power supply 200 to the vehicle 1 side when starting external charging, the system voltage suddenly decreases. Due to this influence, the power supplied to other electrical devices connected to the system power supply 200 may change suddenly, and the brightness of, for example, a light bulb may change.

  Therefore, ECU 200 according to the present embodiment increases charging power command value Pcom stepwise when starting external charging.

  FIG. 2 is a flowchart showing the flow of processing when the ECU 40 performs external charging. This flowchart is repeatedly executed at a predetermined cycle period.

  In S10, ECU 40 sets charging power target value Ptag. The charging power target value Ptag may be a variable value that varies according to the amount of power stored in the battery 30, or may be a predetermined fixed value. In any case, the charging power target value Ptag is set to 0 before the start of external charging, is set to a value greater than 0 after the start of external charging, and is set to 0 again after the completion of external charging. .

  In S11, ECU 40 determines whether or not there is an immediate charge stop request. For example, the ECU 40 determines that there is an immediate charge stop request when an abnormality occurs in any part of the charging system. When there is an immediate charge stop request (YES in S11), ECU 40 moves the process to S14 (described later).

  If there is no immediate charge stop request (NO in S11), ECU 40 determines in S12 whether or not the amount of change in charge power command value Pcom is being restricted (processing in S16 or S19 described later). judge.

  When the amount of change in charge power command value Pcom is not limited (NO in S12), ECU 40 determines in S13 the absolute value of the difference between charge power target value Ptag and the charge power command value Pcom of the previous cycle. It is determined whether or not the value is larger than α.

  When the absolute value of the difference between charging power target value Ptag and charging power command value Pcom of the previous cycle is less than threshold value α (NO in S13), ECU 40 determines the charging power command value of the current cycle in S14. Pcom is set to the charging power target value Ptag. That is, the amount of change in charge power command value Pcom is not limited. Thereafter, the ECU 40 clears the limit counter in S15.

  On the other hand, when the absolute value of the difference between charge power target value Ptag and the charge power command value Pcom of the previous cycle exceeds threshold value α (YES in S13), ECU 40 starts from the previous cycle in S16. The amount of change in charge power command value Pcom is limited to threshold value α. Specifically, when the charging power target value Ptag is larger than the charging power command value Pcom of the previous cycle, the ECU 40 sets the charging power command value Pcom of the current cycle and the threshold value α to the charging power command value Pcom of the previous cycle. Set to the added value. When the charging power target value Ptag is smaller than the charging power command value Pcom of the previous cycle, the ECU 40 sets the charging power command value Pcom of the current cycle to a value obtained by subtracting the threshold value α from the charging power command value Pcom of the previous cycle. Set. Thereafter, the ECU 200 increments (increases) the limit counter in S17.

  If the amount of change in charge power command value Pcom is being restricted (YES in S12), ECU 40 determines in S18 whether the limit counter has exceeded a predetermined value.

  If the limit counter does not exceed the predetermined value (NO in S18), that is, if the predetermined period has not yet elapsed since the start of limiting the amount of change in charge power command value Pcom, ECU 40 performs the current cycle in S19. The charging power command value Pcom is kept the charging power command value Pcom of the previous cycle, and the amount of change in the charging power command value Pcom is continuously limited. Thereafter, the ECU 40 moves the process to S17 and increments the limit counter.

FIG. 3 is a diagram illustrating a change in system voltage when external charging is started and stopped.
Before the time t1, the charging power command value Pcom is set to 0 because it is before the start of external charging.

  At time t1 when external charging is started, charging power target value Ptag is set. However, since the difference between the set charging power target value Ptag and the charging power command value Pcom (= 0) of the previous cycle exceeds the threshold value α, the charging power command value Pcom is 0 and the charging power target value. The electric power value Pmid (= α) between Ptag is set.

  During a period from time t1 to time t2 when the limit counter reaches a predetermined value, charging power command value Pcom is maintained at power value Pmid. Thereby, compared with the case where charging power command value Pcom is suddenly increased to charging power target value Ptag, the instantaneous decrease amount of the system voltage (effective value) can be reduced.

  When the limit counter reaches a predetermined value at time t2, charging power command value Pcom is increased from power value Pmid to charging power target value Ptag.

  As described above, when the charging power command value Pcom is increased from 0 to the charging power target value Ptag at the start of external charging, the charging power command value Pcom is set to a power value Pmid between 0 and the charging power target value Ptag. The period is maintained, and the charging power command value Pcom is increased to the charging power target value Ptag after elapse of a predetermined period. Thereby, compared with the case where charging power command value Pcom is instantaneously increased to charging power target value Ptag, the amount of instantaneous decrease in system voltage (effective value) can be reduced. Therefore, it is possible to suppress a sudden change in the power supplied to other electrical devices connected to the system power supply 200.

  Similarly, when external charging is stopped after time t3, similarly, by limiting the amount of change in the charging power command value Pcom to the threshold value α, the charging power command value Pcom may be reduced instantaneously. Not in stages. Thereby, the instantaneous increase amount of system voltage (effective value) can be made small, and it can control that the electric power supplied to other electric equipment connected to system power supply 200 changes suddenly. .

  As described above, the ECU 40 according to the present embodiment does not increase the charging power command value Pcom (that is, the power supplied from the system power supply 200 to the battery 30) abruptly at the start of external charging. Increase. Therefore, it is possible to suppress a sudden change in the power supplied to other electrical devices connected to the system power supply 200 at the start of external charging.

  The embodiment disclosed this time should be considered as illustrative in all points 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, 10 charging inlet, 20 charger, 30 battery, 40 ECU, 200 system power supply, 210 charging connector.

Claims (1)

A vehicle capable of external charging that charges an in-vehicle battery with electric power supplied from a power source outside the vehicle,
A charging inlet connected to a power source external to the vehicle;
A charger connected to the charging inlet and the battery;
A control device for controlling charging power supplied to the battery by controlling the charger;
The control device sets the charging power to a third power between the first power and the second power when increasing the charging power from the first power to the second power at the start of the external charging. A vehicle that maintains a period and increases the charging power to the second power after the lapse of the predetermined period.

Images