Idle charging method and device for hybrid electric vehicle

The invention relates to the field of hybrid electric vehicles, and provides an idle charging method for a hybrid electric vehicle. The idle charging method comprises the steps that target charging power is obtained according to a current battery state-of-charge (SOC) value; looking up is conducted in a motor electricity generation power meter and a system charging efficiency table according to the target charging power, and it is determined that the motor electricity generation power is the target charging power and the working point when the system charging efficiency value is maximum is theoptimal working point; and according to the rotating speed and the torque of the optimal working point, an engine is controlled to work for idle charging. By utilizing the idle charging method, the efficiency during idle charging can be greatly improved, and the fuel economical efficiency is improved. 本申请涉及混合动力汽车领域，提供一种混合动力汽车的怠速充电方法，该方法包括：根据当前的电池SOC值，获得目标充电功率；根据所述目标充电功率，在电机发电功率表和系统充电效率表中进行查找，确定电机发电功率为所述目标充电功率且系统充电效率值最大时的