International Journal of Vehicle Structures and Systems

M. A. A. Emam ¹, S. M. Shaaban ¹, S. M. El-Demerdash ¹, H. M. El-Zomor ²

Affiliations
1 Automotive and Tractor Engineering Dept., Helwan University, EG
2 Higher Technological Institute, 10th of Ramadan City, 6th of October Branch, EG

Abstract

This paper presents a computerized tyre pressure control system for off-road vehicles to achieve the required tyre flotation pressure during their mobility. This method accounts for soil deformation and tyre deflection in the vehicle tyre-terrain interaction. A test rig has been designed to apply vertical load to the tyre at the tyre to terrain surface. The deflection and inflation pressure of the tyre were recorded by a data acquisition system. The test rig is integrated with a pressure system for tyre inflation and deflation. The proposed control system ensures that the soil deformation is higher than the tyre deflection. Experimental results showed that the proposed control system adjusted the tyre pressure to the flotation pressure for a given load and soil conditions within a reasonably shorter elapsed time.

Keywords

Off-Road Mobility, Tyre Pressure Control, Tyre Flotation, Tyre Sinkage.

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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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