Automotive active suspensions Part 1: Basic principles

Abstract

Automotive suspension design is a compromise brought about by the conflicting demands of ride and handling. The past few years have seen the introduction of increasingly sophisticated, electronically controlled, components into automotive suspensions which redefine the boundaries of the compromise.

The paper has been written in two parts. This first part reviews the compromises which are required in the design of a conventional passive suspension. It then goes on to show how those compromises can be changed by the inclusion of active components.

The second part discusses the hardware employed which ranges from simple switched dampers, through semi-active dampers, and low bandwidth/soft active suspensions, to high bandwidth/stiff active suspensions. The benefits to be derived from each of the technologies will be assessed, together with their strengths and weaknesses.

Keywords

active dampers dynamics control ride suspension adaptive semi-active

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References

Robson

J. D.

Road surface description and vehicle response. Int. J. Vehicle Design, 1979, 1 (1), 25–35.

Gillespie

T. D.

Fundamentals of Vehicle Dynamics, 1992, pp. 279–284 (Society of Automotive Engineers).

Hedrick

J. K.

Invariant properties of automotive suspensions. Proceedings of IMechE International Conference on Advanced Suspensions, 24–25 October 1988, paper C423/88, pp. 35–42 (Mechanical Engineering Publications, London).

Kwakernaak

Sivan

Linear Optimal Control Theory, 1972, pp. 253–269 (Wiley Interscience).

Williams

R. A.

Active suspensions optimal or classical?

Proceedings of 9th IAVSD Symposium, Linköping, 1985, pp. 607–620.

Sharp

R. S.

Hassan

S. A.

Performance and design consideration for dissipative semi-active suspension systems for automobiles. Proc. Instn Mech. Engrs, Part D, 1987, 201(D2), pp. 1–5.

Miller

L. R.

The effect of hardware limitations on an on/off semi-active suspension. Proceedings of IMechE International Conference, 24–25 October 1988, paper C442/88, pp. 199–206 (Mechanical Engineering Publications, London).

Williams

R. A.

Best

Crawford

I. L.

Refined low frequency active suspension. Proceedings of IMechE International Conference on Vehicle Ride and Handling, 15–17 November 1993, Birmingham, paper C466/028/93, pp. 285–300 (Mechanical Engineering Publications, London).