Control/structure interaction in hydraulic power steering systems

Author

Ferries, Gary R. ; Arbanas, R. Larry

Volume

2

fYear

1997

fDate

4-6 Jun 1997

Firstpage

1146

Abstract

A hydraulic power steering system uses feedback control to assist the driver in applying steering input commands to the vehicle. A small vibration, known as shudder, can occur in the system during low speed steering manoeuvres. It is shown that power steering shudder is a closed-loop limit cycle caused by the interaction of the hydraulic and structural dynamics of the vehicle. The model equations are derived, the theoretical background behind the approach is presented and some specific analytical results that reveal the control/structure interaction are examined. This understanding can be used to synthesize modifications which reduce the likelihood of shudder. Some examples of the effect of various hydraulic component modifications are shown

Keywords

closed loop systems; feedback; frequency-domain analysis; hydraulic systems; limit cycles; position control; road vehicles; closed-loop limit cycle; control/structure interaction; feedback control; hydraulic power steering systems; low speed steering manoeuvres; shudder; steering input commands; Control systems; Equations; Feedback control; Frequency; Limit-cycles; Power steering; Power system modeling; Valves; Vehicle driving; Vehicle dynamics;

fLanguage

English

Publisher

ieee

Conference_Titel

American Control Conference, 1997. Proceedings of the 1997

Conference_Location

Albuquerque, NM

ISSN

0743-1619

Print_ISBN

0-7803-3832-4

Type

conf

DOI

10.1109/ACC.1997.609712

Filename

609712