The invention provides a battery charging and discharging power limiting method and system for a new energy vehicle. The battery charging and discharging power limiting method comprises the followingsteps: acquiring, in real time, the actual power P, the maximum allowable charging and discharging power Py, the motor efficiency eta and the motor rotating speed N of a power battery of a vehicle; integrating the difference value between the actual power P and the maximum allowable charging and discharging power Py to obtain a power integral value E which is greater than 0; calculating, according to the power integral value E, a limiting proportion K for limiting the maximum allowable charging and discharging power Py; calculating the allowable driving power Pmax of a motor of thevehicle according to the maximum allowable charging and discharging power Py and the limiting proportion K; according to the allowable driving power Pmax, the motor efficiency of the vehicle and themotor rotating speed, calculating the allowable driving torque Tmax of the motor, and limiting the output torque of the motor to be smaller than or equal to the allowable driving torque Tmax. According to the scheme, the phenomenon of long-time overcharge and overdischarge of the power battery in the using process can be avoided.

    本发明提供了一种用于新能源车辆的电池充放电功率限制方法及系统。电池充放电功率限制方法包括如下步骤:实时获取车辆的动力电池的实际功率P、最大允许充放电功率P、电机效率η以及电机转速N;对实际功率P和最大允许充放电功率P的差值进行积分获取功率积分值E,其中,E>0;根据功率积分值E计算获得对最大允许充放电功率P进行限制的限制比例K;根据最大允许充放电功率P和限制比例K计算获得车辆的电机的允许驱动功率P;根据允许驱动功率P、车辆的电机效率以及电机转速获得电机的允许驱动扭矩T,限制电机的输出扭矩小于或等于允许驱动扭矩T。本发明方案可以避免动力电池在使用过程中出现长时间的过充过放现象。


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    Title :

    Battery charging and discharging power limiting method and system for new energy vehicle


    Additional title:

    一种用于新能源车辆的电池充放电功率限制方法及系统


    Contributors:
    CHEN TIAN (author) / LIU GUORUI (author) / ZHANG JIAJU (author) / LYU XIFENG (author) / ZHANG JIANKANG (author) / ZHANG JIANLEI (author) / CHENG WEI (author)

    Publication date :

    2020-07-17


    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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