The EPS electronic power steering system is based on the traditional mechanical steering system. According to the torque signal on the steering wheel and the driving speed signal of the car, the electronic control device is used to generate auxiliary power of corresponding size and direction from the electric motor to assist the driver in steering operations. It can easily provide different assistance effects to the electric motor at different speeds, ensuring that the car is lightweight and flexible when turning at low speeds, has sufficient road feel when turning at high speeds, and is stable and reliable.

Although different cars have different structural components, the structure of the EPS system is generally the same. It is generally composed of a torque (steering) sensor, electronic control unit, electric motor, reducer, mechanical steering gear, and battery power supply.