Title: A theoretical study of the hydro-pneumatic semi-active suspension system with preview

Authors: Ali M. Abd El-Tawwab, S.A. Abou-El-Seoud

Addresses: Automotive and Tractor Engineering Department, Faculty of Engineering, Minia University, Minia, Egypt. ' Automotive Department, Faculty of Engineering, Helwan University, Materia, Egypt

Abstract: In recent years, great attention has been concentrated on the design of semi-active suspension systems from the point of view of improving vehicle ride comfort. In this paper, a preview hydro-pneumatic semi-active suspension system of a quarter car model moving along a randomly profiled road surface is investigated. The computer program which controlled the hydro-pneumatic semi-active suspension system was designed only to dissipate energy. Track irregularities are measured by sensors in front of the vehicle, and this information is used by the computer-controlled hydro-pneumatic semi-active suspension system. This means that the deformation of the track can be taken into account when calculating the semi-active control loop. The practical limitations involving hydro-pneumatic semi-active time delay and dead time delay values are considered Theoretical results for the performance of a passive, hydro-pneumatic semi-active suspension with and without the preview version, are compared. It is shown that the hydro-pneumatic semi-active suspension system, with and without preview, offers worthwhile improvements over the passive suspension system.

Keywords: heavy vehicles; hydro-pneumatic suspension; semi-active suspension; preview control; vehicle dynamics.

DOI: 10.1504/IJHVS.1998.054607

International Journal of Heavy Vehicle Systems, 1998 Vol.5 No.2, pp.167 - 180

Published online: 18 Jun 2013 *

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