Electric power steering (EPS) is a kind of power steering system that directly relies on the motor to provide auxiliary torque. Compared with the traditional hydraulic power steering system HPS, EPS system has many advantages. EPS is mainly composed of torque sensor, speed sensor, motor, deceleration mechanism and electronic control unit (ECU).
The torque sensor is connected to the steering shaft (pinion shaft). When the steering shaft rotates, the torque sensor starts to work, which converts the relative rotational angular displacement of the input shaft and the output shaft under the action of the torsion bar into an electrical signal and transmits it to the ECU. ECU determines the rotation direction of the motor and the magnitude of the power-assisted current according to the signals of the speed sensor and the torque sensor, so as to complete the real-time control of power-assisted steering.
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Technical characteristics of EPS system
1, EPS is energy-saving and environmentally friendly.
Because the hydraulic pump is always working when the engine is running, the hydraulic steering system increases the fuel consumption of the whole engine by 3% ~ 5%, while EPS uses batteries as energy source and motors as power components, which can work independently of the engine, and EPS hardly consumes engine fuel directly. EPS does not have the oil leakage problem of hydraulic power steering system, and EPS is electrically controlled, which has little environmental pollution.
2.EPS is easy to assemble.
EPS is easy to assemble. The main components of EPS can be integrated together for easy arrangement. Compared with the hydraulic power steering system, it reduces many components, such as oil pump, oil pipe, pressure and flow control valve, oil storage tank, etc. For the hydraulic system. Less parts, convenient assembly and time saving.
Baidu Encyclopedia-Electric Power Steering System