The working principle of the car steering motor: When the car is turning, the torque (steering) sensor will feel the torque of the steering wheel and the direction to be rotated, and the signal will be sent to the electronic control unit through the data bus. The electronic control unit will Data signals such as the direction of rotation will send an action command to the motor controller, so that the motor will output a corresponding amount of torque as needed to generate power steering.
Full name: ElectronicPowerSteering, referred to as EPS. It uses the power generated by the electric motor to assist the driver in power steering. EPS composition: It is generally composed of torque (steering) sensor, electronic control unit, motor, reducer, mechanical steering gear, and animal battery power supply.
Since the electric power steering system only requires electricity and does not require hydraulic pressure, it omits many components compared with mechanical hydraulic power steering systems. There are no oil pumps, oil pipes, pressure and flow control valves, oil storage tanks, etc. required by the hydraulic system. The number of parts is small, the layout is convenient, and the weight is light.
And there is no "parasitic loss" and liquid leakage loss. Therefore, the electric power steering system can save about 80% energy under various driving conditions, which improves the running performance of the car. Therefore, it has been rapidly promoted in recent years, which is also the development direction of power steering systems in the future.
In order to ensure the portability of the car when turning in place or turning at low speeds, the displacement of the oil pump is determined by the flow rate of the engine at idling speed. However, most of the time when the car is running at a speed higher than the idle speed and in a straight-line state, most of the oil output from the oil pump can only be returned to the oil storage tank through the control valve, causing great "parasitic losses".
In order to reduce such losses, a motor-driven oil pump is used. When the car is driving straight, the motor runs at a low speed, and the motor runs at a high speed when the car is turning. The flow and pressure of the oil pump are adjusted by controlling the motor speed to reduce "parasitic losses.