The invention discloses an engine starting method and system for a hybrid electric vehicle, and the method comprises the steps: receiving the state information of a high-voltage power battery of a battery management system after a vehicle control unit determines that no starting forbidding fault exists, and judging whether the temperature of the high-voltage power battery is lower than a temperature limit value or not; the discharge power of the high-voltage power battery is smaller than a power limit value; if yes, controlling the direct current-direct current converter to start working, and converting high voltage of the high-voltage power battery into low voltage; and a starting control instruction is sent to the low-voltage starter to drive an engine of the hybrid electric vehicle to start, and at the moment, the low-voltage starter is powered by a low-voltage storage battery and a direct current-direct current converter of the hybrid electric vehicle at the same time. According to the temperature and the discharging power state of the high-voltage power battery, the starting mode of the engine is controlled, and the problems that the discharging power of the power battery is insufficient due to the too low temperature, and the high-voltage power battery cannot start the engine are solved.

    本申请公开了一种混动汽车的发动机启动方法及系统,方法包括:若整车控制器确定无禁止启动故障后,接收电池管理系统的高压动力电池状态信息,判断是否满足高压动力电池的温度低于温度限值,并且高压动力电池的放电功率小于功率限值;若是,则控制直流‑直流转换器开始工作,将高压动力电池的高压电转换为低压电;发送启动控制指令给低压起动机,驱动混动汽车的发动机启动,此时,低压起动机由混动汽车的低压蓄电池和直流‑直流转换器同时供电。本申请根据高压动力电池的温度、放电功率状态,控制发动机的启动方式,解决因温度过低导致的动力电池的放电功率不足,高压动力电池无法启动发动机的问题。


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    Title :

    Engine starting method and system of hybrid electric vehicle


    Additional title:

    一种混动汽车的发动机启动方法及系统


    Contributors:
    WANG MING (author) / LI CHUANGJU (author) / HU JING (author) / GENG CHAO (author) / CAO HAO (author) / LUO SHICHENG (author) / YAO XUESEN (author) / SUN QIANG (author) / YUE CAISHOU (author)

    Publication date :

    2024-11-15


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion / F02N STARTING OF COMBUSTION ENGINES , Anlassen von Brennkraftmaschinen



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