Research Of Electro-hydraulic Proportion Steering Control System On Multi-axle Vehicle

When an high tech be apply for the real production, there must be a new revolution will comes. The Automotive-Electronics is a essential revolution base on the rapid development of Electronics. The large-scale crane and some other engineering machinery is on the way of intelligentize by using this theory. As for some domestic all terrain crane Manufacturer, the key technical of steering system is still backward, because there are seldom electro-equipment in the steering system. The performance of multi-axle steering system is lied on the control arithmetic, it vital enough to have research on the characteristics of the multi-steering system, and it can enhance the flexible and stability of the crane. Not only a control system must have the core algorithm also to have his implementing agency, the implementing agency of the multi-axle steering system is electro-hydraulic proportional control system. Electro-hydraulic proportional control system which is based on the electro-hydraulic servo control system contrapose to lower the characteristics of the control system. This paper established the model of the electro-hydraulic proportional control system by using the simulation software AMESim. The model contains from the input speed and the angle of steering wheel to the output displacement of the steering cylinder, and use the results of the Matlab model as a input data to simulate the whole steering system. At the last this paper bring forward the main idea for establishing the steering test-bed and put forward steering by wire of multi-axle vehicle.The paper contains the idiographic parts below:At first, A two free-degree model is established base on the thoery of multi-axle steering; analysed the characteristics of the multi-steering system by using the simulation software Matlab/Simulink. Contraposed a five-axle all terrain crane to analyse. The zero lateral deflection contorl method is used on the simulation of the whole crane , the lateral deflection angle and the lateral acceleration are analysed in the frequency domain. Secondly, A math model which from the input amplifier to the output displacement of the cylinder is established by analysing the principle of the parts in the Electro-hydraulic proportional control system of the all terrain crane, and the transfer function is analysed by using Matlab/Simulink. It is manly analyses the stability and responsibility of the control system, the simulation shows the response time is about 0.16s.The results that the control system has good reliability and stability.Thirdly, this paper presents the single implement system model which established in AMESim, and the simulation shows that the math model which established in Matlab/Simulink is right. At the same time the whole Electro-hydraulic proportional control system model of the crane is been build and simulated, it contains the control unit and the hydraulic unit. This is a foundation of the establishment of the test-bed.At last, a thought of the single steering test-bed is been principium introduced. Put forward a new concept—steering by wire of multi-axle vehicle, designed the steering by wire of three-axle vehicle and simulating the model in Matlab/Simulink. The results shows steering by wire of multi-axle vehicle can match the response needs, it is also proved that the arithmetic of common vehicle can transplant to steering by wire of multi-axle vehicle. The paper summarize the problems of the steering by wire of multi-axle vehicle at present-day, and analysed the foreground of the steering by wire of multi-axle vehicle.This paper shows that electro-hydraulic proportional control system and steering by wire of three-axle vehicle system can be established by electro-hydraulic proportional steering control system. The steering by wire of three-axle vehicle system can be a guide for the high tech use in large-scale vehicle and the way of intelligentize of large-scale vehicle.