What is Electric Power Steering?

1 Answers
DiCaroline
07/29/25 11:00pm
Electric power steering is the EPS system, a power steering system that directly relies on an electric motor to provide auxiliary torque. The electric power steering system does not have the hydraulic pump, hydraulic pipelines, or steering column valve structure of a hydraulic power steering system. Instead, it transmits the assistance generated by the motor to the steering system purely mechanically through a reducer. The electric power steering system consists of a steering column, torque sensor, servo motor, and control module. Its working principle is as follows: After the vehicle starts, the system begins to operate. When the vehicle speed is below a certain threshold, a signal is sent to the control module, which then issues control commands to the servo motor based on data such as steering wheel torque, rotation direction, and vehicle speed. This causes the servo motor to output torque of a corresponding magnitude and direction to generate assistance. When no steering input is detected, the electronic control unit does not send a torque signal to the servo motor, and the current in the servo motor tends toward zero.
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