International Journal of Vehicle Structures and Systems

M. S. Tayea ¹, M. A. A Emam ¹, S. M. Shaaban ¹, S. M. El-Demerdash ¹, M. Galal Rabee ²

Affiliations
1 Automotive and Tractor Engineering Dept., Helwan University, EG
2 Manufacturing & Production Technology Dept., Modern Academy for Engineering and Technology, Cairo, EG

Abstract

The dynamic characteristics of an Electro-hydraulic (EH) steering system plays an important role in realizing an accurate steering control for an automatically guided vehicles. In this paper, a mathematical model has been developed for EH steering system that includes EH servo valve with mechanical feedback, steering actuation cylinders and associated steering linkages. A proportional-integral controller has been designed to improve the dynamic performance of EH steering system for off-road vehicles. The simulated system models using SIMULINK were validated using experimental tests. The control of steering angle using the proposed proportional-integral controller has been demonstrated for different soil conditions.

Keywords

Off-Road Vehicles, EH Steering System, Kinematic Model, Proportional Integral Controller, SIMULINK.

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Essam M. Allam ¹, M. A. A Emam ¹, Eid.S Mohamed ¹

Affiliations
1 Dept. of Automotive and Tractors Engg., Helwan University, Cairo, EG

Abstract

This paper presents the effect of the suspension working space, body displacement, body acceleration and wheel displacement for the non-controlled suspension system (passive system) and the controlled suspension system of a quarter car model (semi-active system), and comparison between them. The quarter car passive and semi-active suspension systems are modelled using Simulink. Proportional Integral Derivative controllers are incorporated in the design scheme of semi-active models. In the experimental work, the influence of switchable damper in a suspension system is compared with the passive and semi-active suspension systems.

Keywords

Switchable Dampers, Semi-Active Suspension, Controlled Suspension, Proportional Integral Derivative Control.

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