Auto repair knowledge-help

1 Mechanical hydraulic power steering system is generally composed of hydraulic pump, oil pipe, pressure and flow control valve body, and V-type transmissionbelt, Oil storage tank and other components.

2 This system needs to work regardless of whether the car is steering or not, and when the vehicle speed is low in large steering, the hydraulic pump needs to output more power to obtain a larger boost. Therefore, resources are also wasted to a certain extent. It can be recalled: driving such a car, especially when turning at low speed, feels that the direction is heavier and the engine is more laborious. And because the pressure of the hydraulic pump is very large, it is easier to damage the booster system.

In addition, the mechanical hydraulic power steering system is composed of hydraulic pumps, pipelines and cylinders. In order to maintain pressure, the system must always be in working condition regardless of whether steering assistance is required, and the energy consumption is high, which is also one of the reasons for the consumption of resources.

Generally, economical cars use mechanical hydraulic power assist systems.

2. Electronic hydraulic power steering system

1 Main components: oil storage tank, power steering control unit, electric pump,Steering machine, Power steeringsensorEtc., where the power steering control unit and the electric pump are an integral structure.

2 Working principle: The electronic 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 uses an electric pump. All its working states are the optimal state calculated by the electronic control unit according to the vehicle's driving speed, steering angle and other signals. Simply put, when turning at low speeds and high speeds, the electronic control unit drives the electronic hydraulic pump to run at high speed to output greater power, so that the driver can steer and save effort; when the car is running at high speed, the hydraulic control unit drives the electronic hydraulic pump at a lower speed Operation, without affecting the need for high-speed steering, while saving part of the engine power.

3. Electric Power Steering System (EPS)

1 The full English name is Electronic Power Steering, referred to as EPS, uses the power generated by an electric motor to assist the driver in power steering. The composition of EPS, although the structural components of different cars are not the same, but generally the same. Generally by torque (steering)sensor, Electronic control unit, motor, reducer, mechanical steering gear, and animal 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 rotated. These signals will be sent to the electronic control unit through the data bus, and the electronic control unit will be based on the transmission torque. Data signals such as the direction to be turned and other data signals are issued to the motor controller, so that the motor will output a corresponding amount of torque according to the specific needs, thereby generating a power-assisted steering. If it does not turn, the system will not work, and it will be in standby (sleep) state waiting to be called. Due to the working characteristics of electric power steering, you will feel that driving such a car has a better sense of direction, more stable at high speeds, and as the saying goes, the direction does not flutter. And because it does not work when it is not turning, it also saves energy to some extent. Generally, high-end cars use such power steering systems.