2.4动力转向系统是发展方向动力转向系统的广泛应用，不仅在沉重的公交车必须装备，适用于高级轿车、中等的应用和普及。渐渐地，主要是从减轻驾驶员疲劳，提高操纵光与稳定。虽然带来更高的成本和结构复杂的问题，但由于明显的优势，得到快速发展。动力转向有三种形式:积分,安排和曼联一半阀门类型动力转向系统结构。现在三种形式、快速发展,积分前轴重二手车,八吨前轴负载阀用于5 # 0;18吨汽车,超过一半的前轴负载部门为作者的车。
从发展趋势看，在国外发展较快，但整体舵机积分转向器临时阀门结构是发展的方向。
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Auto steering system development history
Steering system is necessary in vehicle system is the basic system, driver through the steering wheel to manipulate and control car's direction of travel, so as to realize the intention of his driving.
For more than 100 years, automobile industry with mechanical and electronic technology development and progress. Today, the car is not purely mechanical sense of a car, it is the mechanical, electronic, materials and other comprehensive product. Steering system with the development of the car industry after the long evolution.
The traditional steering system is mechanical steering system, automotive steering wheel, by pilot control through such a series of mechanical parts steering wheel to realize the deflection, so as to realize the steering.
As in the 1950s, hydraulic power steering system in automotive applications, marked the beginning of steering system. Sources of power steering by previous human to human and hydraulic booster.
Hydraulic booster HPS (Hydraulic Power Steering) is in the Steering system based on the mechanical and Hydraulic system increased a. The hydraulic system and the engine, when the general part of the engine starts, provide automobile engine power forward, another part of the kinetic energy of hydraulic system for power. Due to its reliable work, mature technology still has been widely used. The steering system of the main characteristic is the fluid pressure, reduce drivers support in the steering wheel, improved the steering light and auto operation stability.
But at the same time, there are also some hydraulic power system flaw:
Aiming at vehicle design and manufacture, after the completion of the vehicle steering dynamical characteristics cannot change. The direct consequence is that when the dynamical characteristics in low power, car in low segment can get very good, but in high-speed period has good way to sense, because cannot adjust dynamical characteristics, no better way drivers, When the dynamical characteristics in high power, not very good at low segment tprompt
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effect.
If not, aiming to vehicle hydraulic system must also be in the engine driving. As a result, the energy consumption, increase fuel engine,
Existing hydraulic oil leakage problems should not only to environmental pollution, and easy to other components.
Aiming at low temperatures, hydraulic system performance is poor.
In recent years, with the electronic technology in the wide application, steering system also more and more used electronic devices. Turn into the electronic control system, therefore, the corresponding appeared electrohydraulic power steering system. Electrohydraulic Power Steering can be divided into two categories: electric Hydraulic Steering system (Electro Hydraulic Power - the EHPS) and electric Hydraulic Steering Electronically Controlled ECHPS Steering (Hydraulic Power Steering). Electric hydraulic steering system is in hydraulic power system on the basis of the development of hydraulic booster systems, and different is, electric hydraulic power system of power sources in the hydraulic system, but not by motor engine motor drive hydraulic system, save energy and reduce the engine fuel consumption. Electric hydraulic steering is in traditional hydraulic booster systems on the basis of the development, the difference is that the electric hydraulic steering system, electronic control devices increased. The electronic control unit can according to the steering rate, speed auto operation parameters of hydraulic system, change the size of the hydraulic booster at different speeds, so as to realize the change, dynamical characteristics. But under the motor drive hydraulic system, in turn, motor can stop turning, thereby reducing energy consumption.
Although electrohydraulic power steering system of hydraulic steering overcomes the drawbacks. But due to the existence of hydraulic system, it exists the hydraulic oil leakage problem, and electrohydraulic power steering system, introduced motor drive system is more complex, costs and reliability.
In order to avoid Electric hydraulic Steering system, Electric Power Steering system of Electric Power Steering (EPS) should now. It with all sorts of steering system, the biggest difference lies in the electric power steering system has no hydraulic system. Originally
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produced by hydraulic steering system by motor. Electric power steering system of general by the torque sensor and microprocessor, motor, etc. The basic principle is: when the driver turned the steering wheel drive shaft rotation, to install in the rotation axes of the torque sensor and torque signal into electrical signals to microprocessors, microprocessor based on speed and torque signal other vehicles running parameters, according to the set procedures in the treatment of that power motors booster direction and the size of the booster. Since 1988, the first in Japan suzuki Cervo car to equip the steering system, power steering system is widely recognized by the people.
Steering system is mainly embodied in the following aspects:
A power steering system can provide different at different speeds under the dynamical characteristics. In the low road, steering, to increase more light, At high speed reduced steering, even in order to improve the road are increased to damp.
A power steering system only in steering motors to work, to provide power, so as to reduce energy consumption.A motor, so by battery-powered electric power steering system can not work in engine under the condition of the work.
Electric power steering system should not hydraulic system, compared with hydraulic booster systems and automated assembly. And electric power steering system can change the booster program microprocessor algorithm, easy dynamical characteristics of the change. The development of science and technology is changing, the traditional steering system of steering control (wheel steering), and turn of transmission mechanism. But the thought of the spark can always bring surprise! Electronic Steering system SBW Steering (to the Wire) was changed to the traditional concept of three most with micro-controller, it was replaced By the Steering transmission mechanism, the three most into two parts. Electronic steering system is the most advanced and automotive steering system of technology. It mainly consists of steering control module, to execute module and micro controller three modules.
Steering control module's main function is to torque sensor detection by the driver intention, and to detect signal (including rotation direction and rotational speed, etc) by bus to micro controller, and micro controller based on the signal, and speed feedback control module is a steering wheel to make drivers, can feel road. But this is the way, is the development of
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