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The Research on an Electro-Hydraulic Steering System for Wheeled Engineering Machinery

Author: LiHuiMin
Tutor: GaoYingJie
School: Yanshan University
Course: Mechanical and Electronic Engineering
Keywords: Wheeled Construction Machinery Electro-hydraulic steering system Structural optimization PID control Modeling and Simulation
CLC: U463.4
Type: Master's thesis
Year: 2008
Downloads: 204
Quote: 5
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Abstract


Wheeled construction machinery due to its mobility, environmental adaptability , etc., in recent years has been developing rapidly . With the operational efficiency of the rising demand for construction machinery automation is growing rapidly. Accordingly, the machine parts of the system control performance requirements are also increasing , as accurate action , manipulation of light , safe and comfortable and so on. Electro-hydraulic steering system is a wheeled construction machinery core control technologies for improving the heavy wheeled machinery handling, reducing operator labor intensity has an important role . This article is based on a variety of steering and control system analysis , the paper introduces proportional control of electro-hydraulic steering control system . System uses proportional valve hydraulic cylinders as power steering mechanism , through the steering shaft and the steering cylinder on additional sensors for proportional valve control signal , the use of electro-hydraulic proportional valve for double rod hydraulic cylinders for position control, and by controlling the hydraulic cylinder displacement to achieve the machine steering control . This article based on Ackerman theory steering characteristics , the use of SolidWorks software steering mechanism has been optimized and motion simulation , in the steering process to ensure both sides of the steering wheel rotation relationship . And steering system for PID control simulation and experimental verification. The results show that at low frequencies , a small shift input signal , the cylinder displacement with the input signal to maintain good tracking , with better control performance. By hydraulic cylinder displacement and steering rotation angle conversion , the resulting actual steering characteristic curve with the theoretical steering characteristic curve line to meet the design requirements.

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CLC: > Transportation > Road transport > Automotive Engineering > Automotive structural components > Steering system
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