How does the electric power steering system (EPS) work?

- Feb 27, 2019 -

How does the electric power steering system (EPS) work?

The English full name is Electronic Power Steering (EPS), which uses the power generated by the electric motor to assist the driver in power steering. The composition of EPS, different cars, although the structural components are not the same, but generally similar. It is generally composed of a torque (steering) sensor, an electronic control unit, a motor, a speed reducer, a mechanical steering gear, and a battery power source.

Main working principle: When the car is turning, the torque (steering) sensor will “feel” the torque of the steering wheel and the direction of the intended rotation. These signals will be sent to the electronic control unit through the data bus. The electronic control unit will according to the transmission torque. The data signal, such as the direction of the intended rotation, sends an action command to the motor controller, so that the motor outputs a corresponding amount of rotational torque according to the specific needs, thereby generating a power steering. If you don't turn, the system will not work, and it will wait in the standby state. Due to the working characteristics of electric power steering, you will feel that driving such a car, the sense of direction is better, and the speed is more stable at high speed, that is, the direction is not floating. And because it doesn't work when it doesn't turn, it also saves energy. In general, high-end cars use such power steering systems.