Optimal Preview Control of Active Suspensions with Integral Constraint

In this paper we consider the application of stochastic optimal control theory to the design of an active vehicle suspension with preview control. An integral constraint is included in the performance index to achieve better attitude control characteristics. The two-degree-of-freedom vehicle model travels with constant velocity on both random and deterministic roadways. Information relating to roadway disturbances about to be encountered by the moving vehicle is assumed to be sensed and this information is used by the active control scheme to prepare the system for the ensuing input. We examine the effect of preview control on vehicle performance characteristics in terms of ride comfort, suspension deflection, road-holding ability, control force, and power requirements. The performance characteristics of the devised multivariable controller are evaluated and compared with those of the pertinent active suspension systems based on state variable feedback and conventional passive systems.

[1]  M. M. ElMadany,et al.  On the ride and attitude control of road vehicles , 1992 .

[2]  Davorin David Hrovat,et al.  Nonlinear active suspension with preview , 2001, Proceedings of the 2001 American Control Conference. (Cat. No.01CH37148).

[3]  Arthur E. Bryson,et al.  Applied Optimal Control , 1969 .

[4]  A. Hać.  SUSPENSION OPTIMIZATION OF A 2-DOF VEHICLE MODEL USING A STOCHASTIC OPTIMAL CONTROL TECHNIQUE , 1985 .

[5]  Youngjin Park,et al.  Preview Control of Active Vehicle Suspensions Based on a State and Input Estimator , 1998 .

[6]  Aleksander Hac.  Optimal Linear Preview Control of Active Vehicle Suspension , 1992 .

[7]  M. M. ElMadany.  Optimal Linear Active Suspensions with Multivariable Integral Control , 1990 .

[8]  Bernard Friedland,et al.  Control System Design: An Introduction to State-Space Methods , 1987 .

[9]  C. Pilbeam,et al.  PERFORMANCE POTENTIAL AND POWER CONSUMPTION OF SLOW-ACTIVE SUSPENSION SYSTEMS WITH PREVIEW. , 1996 .

[10]  Ebrahim Esmailzadeh,et al.  Adaptive, preview, and full-optimal control for active vehicle suspensions , 1998 .

[11]  R S Sharp,et al.  On the Preview Control of Limited Bandwidth Vehicle Suspensions , 1993 .

[12]  B. R. Davis,et al.  OPTIMAL LINEAR ACTIVE SUSPENSIONS WITH INTEGRAL CONSTRAINT , 1988 .

[13]  E. K. Bender,et al.  Optimum Linear Preview Control With Application to Vehicle Suspension , 1968 .

[14]  Tetsuro Butsuen,et al.  Invariant Properties of Automotive Suspensions , 1990 .

[15]  Huei Peng,et al.  LQ and H/sub /spl infin// preview control for a durability simulator , 1997, Proceedings of the 1997 American Control Conference (Cat. No.97CH36041).

[16]  R. S. Sharp,et al.  ON IMPROVING THE PERFORMANCE OF AUTOMOTIVE SEMI-ACTIVE SUSPENSION SYSTEMS THROUGH ROAD PREVIEW , 1998 .

[17]  S. Senthil,et al.  Optimal Preview Control of a Two-dof Vehicle Model Using Stochastic Optimal Control Theory , 1996 .