Control device for an electric vehicle

By installing a powertrain ECU and a braking ECU in an electric vehicle, the torque distribution between the front and rear wheels is coordinated and controlled, solving the problem of unstable vehicle behavior under throttle operation and improving stability and regeneration efficiency.

CN122584984APending Publication Date: 2026-08-18TOYOTA JIDOSHA KK
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Patent Information

Application Number
CN202511947307.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2025-02-17
Filing Date
2025-12-23
Publication Date
2026-08-18

AI Technical Summary

Technical Problem

Existing technologies in regenerative braking control of electric vehicles have failed to effectively optimize the torque distribution between the front and rear wheels based on throttle operation, resulting in unstable vehicle behavior and low regenerative efficiency.

Method used

By installing a powertrain ECU and a braking ECU in an electric vehicle, the torque distribution between the front and rear wheels is coordinated and controlled. Based on the throttle and braking operation and vehicle information, the requested regenerated torque and torque distribution ratio are calculated and limited within a preset range to ensure the stability and regeneration efficiency of the torque distribution.

Benefits of technology

It achieves stable vehicle behavior under throttle and braking operations, while improving energy regeneration efficiency, ensuring appropriate torque distribution between the front and rear wheels, and avoiding vehicle instability.

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Abstract

The present invention is to optimize the front-rear torque distribution when regenerative braking is performed on the front and rear wheels at the time of braking based on accelerator operation. The present invention provides a control device for an electric vehicle in which a brake and an electric motor are provided for each of front and rear wheels, the control device being configured to perform the following processes: calculating a requested regenerative torque corresponding to an operation amount of an acceleration / deceleration operation at the time of deceleration; calculating a torque distribution ratio of the front and rear wheels based on vehicle information including a vehicle speed; calculating a regenerative torque available based on the requested regenerative torque, the vehicle information, and the torque distribution ratio; calculating a regenerative request value based on a requested brake torque generated by the brake based on pedal operation and the regenerative torque available; and calculating a regenerative torque of the front and rear wheels based on the regenerative request value, the requested regenerative torque, and the torque distribution ratio.
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