What is the working state of the automobile steering device?

A, mechanical hydraulic power steering system 1. Mechanical hydraulic power steering system is generally composed of hydraulic pump, oil pipe, pressure and flow control valve body, V-belt, oil storage tank and other components. 2. This system will work whether the car turns or not. In the case of low speed in big turn, the hydraulic pump needs to output more power to get more help. So it also wastes resources to some extent. It can be recalled that driving such a car, especially when turning at a low speed, feels that the direction is heavier and the engine is more laborious. Due to the high pressure of hydraulic pump, it is easy to damage the supercharging system. In addition, the mechanical hydraulic power steering system consists of hydraulic pump, pipeline and oil cylinder. In order to maintain the pressure, the system is always in working state whether steering assistance is needed or not, which is also a reason for consuming resources. Generally speaking, mechanical hydraulic power assist system is widely used in economical cars. Second, the electro-hydraulic power steering system? 1. Main components: oil storage tank, power steering control unit, electric pump, steering gear, power steering sensor, etc. The power steering control unit and the electric pump are an integral structure. 2. Working principle: The electro-hydraulic power steering system overcomes the shortcomings of the traditional hydraulic power steering system. The hydraulic pump it uses is no longer directly driven by the engine belt, but an electric pump, and all its working conditions are the most ideal ones calculated by the electronic control unit according to the signals such as vehicle speed and steering angle. To put it simply, the electronic control unit drives the electronic hydraulic pump to run at high speed, so as to output more power when steering at low speed, which makes the driver steering labor-saving; When the car runs at high speed, the hydraulic control unit drives the electronic hydraulic pump to run at low speed, which will not affect the need of high-speed steering and save some engine power. This is a common power steering system. Third, the electric power steering system (EPS) 1. The English full name is Electronic Power Steering, which uses the power generated by the motor to assist the driver in power steering. The composition of EPS is basically the same, although the structural components of different cars are different. Generally, it consists of torque (steering) sensor, electronic control unit, motor, reducer, mechanical steering gear and livestock battery power supply. 2. Main working principle: When the car is turning, the torque (steering) sensor will "feel" the torque of the steering wheel and the direction to be turned, and these signals will be sent to the electronic control unit through the data bus. The electronic control unit will send an action command to the motor controller according to the data signals such as the transmitted torque and the direction to be steered, so that the motor can output the corresponding rotating torque according to the specific needs, thus generating power-assisted steering. If it doesn't turn, the system won't work, and it is in a standby state waiting to be called. Because of the working characteristics of electric power steering, you will feel that driving such a car has a better sense of direction and is more stable at high speed. As the saying goes, the direction does not drift. Because it doesn't work when it doesn't turn, it also saves energy to some extent. Generally, high-end cars use such power steering systems more.