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Working principle of automobile steering pump

Steering assistance is to help drivers adjust the direction of the car, reduce the strength of steering wheel for drivers, and, of course, power steering has a certain role in driving safety and economy.

At present, the power steering system and the information I can see in the car can be divided into three categories:

First, mechanical hydraulic power steering system;

Second, electronic hydraulic power steering system;

Third, electric power steering system.

Mechanical hydraulic power steering system

The mechanical hydraulic power steering system is usually composed of hydraulic pump, oil pipe, pressure flow control valve, V type transmission belt, oil storage tank and other components.

Whether the vehicle is turning or not, the system needs to work. And when the steering speed is low, the hydraulic pump needs to output more power to get greater assistance. So, to a certain extent, it is a waste of resources. Can recall: open such a car, especially when the low speed turn, feel the direction is more heavy, the engine is also more powerful. Also because the pressure of the hydraulic pump is very large, it is also easier to damage the support system.

In addition, the mechanical hydraulic power steering system is made up of hydraulic pumps, pipelines and cylinders. In order to maintain pressure, whether or not it needs steering assistance, the system is always in a working state and has high energy consumption, which is also a reason for resource consumption.

The general economic car uses a lot of mechanical hydraulic power system.

Electronic hydraulic power steering system

The ain components are oil tank, power steering control unit, electric pump, steering gear, power steering sensor and so on. The power steering control unit and electric pump are integral structures.

The principle of work: the electronic hydraulic steering system overcomes the shortcomings of the traditional hydraulic steering system. The hydraulic pump it uses is no longer driven directly by the engine belt, but uses an electric pump. The state of all its work is the ideal state calculated by the electronic control unit according to the signal of the vehicle's running speed and steering angle. Simply said, in a low speed steering, electronic control unit drives the electronic hydraulic pump running at high speed and large power output, the driver hit the steering effort; when the car in high speed, the hydraulic control unit of electronic hydraulic pump operation at low speed driving, in does not affect the high-speed steering at the same time, save a part the power of the engine.

Electric power steering system (EPS)

The full name of the English language is the Electronic Power Steering, called EPS, which uses the power generated by the motor to assist the driver in the power steering. The composition of the EPS, the different cars, although the structural parts are different, are generally identical. It is usually made up of torque (steering) sensor, electronic control unit, motor, reducer, mechanical steering gear, and animal battery power supply.

The main working principle: car steering, torque (steering) sensor will "feel" to the steering wheel torque and quasi rotation direction, these signals through the data bus to the electronic control unit, control unit according to the driving torque, intends to transfer the direction of the data signal, send out instruction to the motor controller and motor according to the torque output will need the corresponding specific size, resulting in power steering. If not, the system does not work and is in the standby (dormant) state waiting for the call. Because of the working characteristics of electric power steering, you feel like driving this kind of car, the direction is better, the high speed is more stable, the saying goes that the direction is not fluttering. And because it does not turn to work, it also saves energy to some extent. Generally high grade cars use this kind of power steering system more.

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