US-12617289-B2 - Control device for electric vehicle

Abstract

In a control device for an electric vehicle, a setting unit sets, as a maximum value of power capable of being charged into the battery, a short time SOP applied during charging in which a charging time is equal to or less than a predetermined time and a long time SOP applied during charging in which the charging time exceeds the predetermined time. A calculation unit calculates a regeneration SOP corresponding to a maximum value of regeneration power from the motor based on the short time SOP and the long time SOP. A control unit controls the regeneration power from the motor in a range equal to or less than the regeneration SOP. The calculation unit gradually changes the regeneration SOP from the short time SOP to the long time SOP in accordance with a duration time of the regeneration power generation.

Inventors

• Hayate TANAKA
• Masahiro Inoue
• Hokuto Yokotsuji
• Kiyotaka Ishikawa
• Hajime SAEKI
• Yasuaki Kano
• Masanori Shinya
• Akihiro TAJIKARA
• Satsuki YAGI

Assignees

• MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA

Dates

Publication Date

20260505

Application Date

20230131

Priority Date

20220304

Claims (6)

1. 1 . A control device for an electric vehicle on which a motor is mounted, the motor having both a function of driving wheels with power of a battery and a function of charging the battery with power generated by regeneration power generation, the control device comprising: a setting unit configured to set, as a maximum value of power capable of being charged into the battery, a short time State Of Power (SOP) applied during charging in which a charging time is equal to or less than a predetermined time and a long time SOP applied during charging in which the charging time exceeds the predetermined time and having a value smaller than the short time SOP; a calculation unit configured to calculate a regeneration SOP corresponding to a maximum value of regeneration power from the motor based on the short time SOP and the long time SOP; and a control unit configured to control the regeneration power from the motor in a range equal to or less than the regeneration SOP, wherein the calculation unit is configured to execute a transition calculation of gradually changing the regeneration SOP from the short time SOP to the long time SOP in accordance with a duration time of the regeneration power generation.
2. 2 . The control device for the electric vehicle according to claim 1 , wherein the calculation unit is configured to start the transition calculation before the duration time of the regeneration power generation reaches the predetermined time.
3. 3 . The control device for the electric vehicle according to claim 1 , wherein the calculation unit is configured to linearly change a ratio of the short time SOP or a ratio of the long time SOP that are reflected in the regeneration SOP with respect to the duration time of the regeneration power generation in the transition calculation.
4. 4 . The control device for the electric vehicle according to claim 3 , wherein the calculation unit is configured to calculate the regeneration SOP based on the following Equation 1: regeneration ⁢ SOP = ( 1 - k 1 ) × ( short ⁢ time ⁢ ⁢ SOP ) + k 1 × ( long ⁢ time ⁢ SOP ) Equation ⁢ 1 where, k 1 : a multiplication coefficient for reduction increasing in proportion to an execution time of the transition calculation, 0≤k 1 ≤1).
5. 5 . The control device for the electric vehicle according to claim 4 , wherein the calculation unit is configured to set a time from a start of the regeneration power generation until a start of the transition calculation and a time change rate of the multiplication coefficient for reduction k 1 in accordance with an operation state of the battery or a traveling state of the electric vehicle.
6. 6 . The control device for the electric vehicle according to claim 3 , wherein the calculation unit is configured to match the ratio of the short time SOP reflected in the regeneration SOP and the ratio of the long time SOP reflected in the regeneration SOP at a time point when the duration time of the regeneration power generation reaches the predetermined time.

Description

TECHNICAL FIELD The present disclosure relates to a control device for an electric vehicle on which a motor is mounted. BACKGROUND ART In the related art, in regeneration power generation of a motor mounted on an electric vehicle, control for limiting regeneration power in consideration of power chargeable to a battery at that time point is known. In this type of control, the regeneration power is set to be relatively small on the assumption that a duration time of the regeneration power generation may be a long time. In contrast, when the duration time of the regeneration power generation is a short time, the regeneration power may be set to be relatively large. With such a setting, it is possible to increase the regeneration power while preventing electrodeposition or deterioration due to overvoltage of the battery (for example, see Patent Literature 1). CITATION LIST Patent Literature Patent Literature 1: JP2011-223698A SUMMARY OF INVENTION Technical Problem In the above-described control, regeneration control is ended when a regeneration time exceeds a predetermined time. For example, in the technique of Patent Literature 1, when initial regeneration power is power Pa and the regeneration time exceeds a time A, the regeneration power is decreased toward 0 with a steep gradient (see FIG. 9). However, the electrodeposition or deterioration of the battery may be prevented even if the regeneration power is not immediately reduced to 0 immediately after the regeneration time exceeds the time A. In the existing control, the regeneration power is excessively prevented and energy losses are large, and thus it is difficult to improve power consumption. An object of the present disclosure is to provide a control device for an electric vehicle capable of improving power consumption in regeneration power generation. It is to be noted that the present disclosure is not limited to this object, and that it is also possible to achieve an operational effect derived from each configuration described in “DESCRIPTION OF EMBODIMENTS” to be described later, which is not obtained by the technique of the related art, as another object of the present disclosure. Solution to Problem A disclosed control device for an electric vehicle can be realized by aspects or application examples disclosed below, and solves at least a part of the above problems. The disclosed control device for an electric vehicle is a control device for an electric vehicle on which a motor is mounted, the motor having both a function of driving wheels with power of a battery and a function of charging the battery with power generated by regeneration power generation. The control device includes: a setting unit that sets, as a maximum value of power capable of being charged into the battery, a short time SOP applied during charging in which a charging time is equal to or less than a predetermined time and a long time SOP applied during charging in which the charging time exceeds the predetermined time and having a value smaller than the short time SOP; a calculation unit that calculates a regeneration SOP corresponding to a maximum value of regeneration power from the motor based on the short time SOP and the long time SOP; and a control unit that controls the regeneration power from the motor in a range equal to or less than the regeneration SOP. In addition, the calculation unit executes a transition calculation of gradually changing the regeneration SOP from the short time SOP to the long time SOP in accordance with a duration time of the regeneration power generation. Advantageous Effects of Invention According to the control device for the electric vehicle of the present disclosure, by gradually changing the regeneration SOP from the short time SOP to the long time SOP, the regeneration power from the motor can be increased while satisfying an electrodeposition protection requirement of the battery, and power consumption can be improved in the regeneration power generation of the electric vehicle. In addition, since switching from the short time SOP to the long time SOP becomes smooth, it is possible to improve travel feeling during the regeneration power generation. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a block diagram showing an electric vehicle and a control device thereof; FIG. 2 is a graph showing temporal changes in a short time SOP and a long time SOP during regeneration power generation of a motor; FIG. 3 is a graph showing a relation between a duration time of a transition calculation and a multiplication coefficient for reduction; and FIG. 4 is an example of a flowchart of control related to the transition calculation during the regeneration power generation. DESCRIPTION OF EMBODIMENTS The control device for an electric vehicle of the present disclosure may be implemented by the following embodiments. Embodiment [1. Device Configuration] FIG. 1 is a block diagram showing a configuration of a control device 10 according to an embodiment and an