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What is the working principle of the electric power steering system?

2 Answers

VanMalachi

09/03/25 4:36am

Working principle of the electric power steering system: 1. The torque sensor is connected to the steering shaft. When the steering shaft rotates, the torque sensor starts working, converting the relative angular displacement between the input shaft and output shaft caused by the torsion bar into an electrical signal and transmitting it to the ECU. 2. The ECU determines the rotation direction of the motor and the magnitude of the assist current based on signals from the vehicle speed sensor and torque sensor, thereby achieving real-time control of power steering. Additional information about the electric power steering system: 1. The electric power steering system utilizes the power generated by the motor to assist the driver in steering operations. 2. The electric power steering system mainly consists of three major components: signal sensing devices (including torque sensor, steering angle sensor, and vehicle speed sensor), steering assist mechanism (motor, clutch, reduction transmission mechanism), and electronic control unit.

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MacVanessa

09/15/25 6:09am

I've driven several cars equipped with electric power steering systems, and the steering feels exceptionally light. Its working principle is actually quite simple: when I turn the steering wheel, sensors in the system immediately detect my steering force and wheel position. Then a small computer unit calculates how much assistance I need and drives an electric motor to provide power assistance. This makes steering less strenuous during slow-speed parking or turning, while not being overly sensitive at high speeds, making driving more effortless. Compared to traditional hydraulic power steering, this system doesn't require an oil pump, so it can also save some fuel costs. I recommend new car owners try this type of vehicle - it's quite comfortable for daily driving and reduces fatigue. However, if you feel the power assistance suddenly changes, you should promptly check the circuit or motor - don't take it lightly.

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