The invention discloses a motor-assisted braking parking method and system for an electric vehicle. The method comprises the steps of detecting whether an electronic parking system of the vehicle is valid or not when the vehicle is parked at a P gear, and employing the motor-assisted braking parking method if the electronic parking system of the vehicle is not valid, and obtaining the current rolling resistance and slope resistance of the vehicle; calculating the feed-forward torque of the motor according to the rolling resistance and the slope resistance; acquiring the actual vehicle speed, the vehicle speed direction and the target vehicle speed; according to the difference value of the actual vehicle speed, the vehicle speed direction and the target vehicle speed, carrying out PI adjustment on the motor torque, and calculating the PI adjustment torque; calculating a target motor torque according to the PI adjustment torque and the feed-forward torque; and controlling the motor to output the target motor torque, the target motor torque acting on the actual vehicle speed and the vehicle speed direction to realize closed-loop vehicle speed control. When the electronic parking mechanism fails, braking and parking can be assisted, and potential safety hazards caused by unexpected slope sliding movement generated when the vehicle is parked on a slope are avoided.

    本发明公开了一种电动汽车电机辅助制动驻车方法及系统,在车辆挂P档驻车时,检测车辆的电子驻车系统是否有效,如果否,则采用电机辅助制动驻车方法,所述方法包括:获取车辆当前的滚动阻力和坡度阻力;根据所述滚动阻力和坡度阻力计算电机前馈扭矩;获取车辆实际车速、车速方向和目标车速;根据所述实际车速、车速方向和目标车速的差值,对电机扭矩进行PI调节并计算PI调节扭矩;根据所述PI调节扭矩与所述前馈扭矩计算得到目标电机扭矩;控制电机输出所述目标电机扭矩,目标电机扭矩作用于实际车速与车速方向,实现闭环车速控制。采用本发明可以在电子驻车机构失效时辅助制动驻车,避免车辆在坡路上驻车产生非预期溜坡移动,带来安全隐患。


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    Title :

    Motor-assisted braking parking method and system for electric vehicle


    Additional title:

    一种电动汽车电机辅助制动驻车方法及系统


    Contributors:
    ZHU JIADONG (author) / ZHANG JIANFENG (author) / CHEN JI (author) / YUWEN ZHIQIANG (author) / WANG XUEFEI (author)

    Publication date :

    2020-11-06


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen



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