Briefly introduce to you the working principle of Rongfang double engine: The power system of this car is composed of a gasoline engine and a motor, when the vehicle starts, the motor runs, the engine does not work, so the ignition is very quiet, less than 20 km\/h, the engine still does not start, when the rapid acceleration or more than 40 km, the engine starts with the motor to provide power, when the motor's power is insufficient, A generator driven by the engine automatically charges the battery, and a power recovery system automatically charges the battery when the vehicle is coasting.