IDENTIFICATION OF POWER STEERING SYSTEM DYNAMIC-MODELS

This paper presents the identification of the dynamic model for a powe r steering system constructed using a rotary valve. The steering syste m is divided into two subsystems: mechanical and hydraulic. Each subsy stem is modeled separately. An experimental setup is designed and buil t to instrument the steering system. The parameters of the steering sy stem are identified using experimental data. Several methods are propo sed for model parameter estimation. The steering system is de-coupled for identification of parameters of each subsystem. The Least Square E stimation method (LSE) is used to determine the parameters that are no t directly measurable or are not measurable at steady state. The devel oped dynamic model is validated against experimental results. (C) 1998 Elsevier Science Ltd. All rights reserved.