The invention discloses a
hybrid electric vehicle control method. According to the
hybrid electric vehicle control method, the operating mode of the whole vehicle is divided into a still mode, a starting mode, a constant-speed traveling mode, an acceleration / assisting mode, a deceleration / braking mode and a fuel
cut-off mode. In the still mode, an engine is
shut down, the speed ratio of a speed
reducer reaches the maximum value, so that preparation is made for starting. In the starting mode, an ISG motor is used for driving the engine to start, so that the vehicle is started. In the constant-speed traveling mode, according to the SOC state of a battery and the speed of the vehicle, the vehicle travels at a constant
low speed or a constant intermediate speed or a constant high speed, so that the engine runs in an economical area or a high-efficiency area. In the acceleration / assisting mode, the ISG motor supplies assisting power to the engine. In the deceleration / braking mode, the ISG motor is in the
electricity generating state. In the fuel
cut-off mode,
fuel supply to the engine is
cut off. According to the
hybrid electric vehicle control method, the operating mode of the whole vehicle is detailed, the braking
energy recovery function is achieved, fuel consumption of the whole vehicle is lowered, and emission is reduced.