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TOYOTA has adopted the Active Hydropneumatic Suspension and the Active Four Wheel Steering(Active 4WS) for the 1991 SOARER. The SOARER'S Active Suspension. is based on CELICA'S Active Suspension for the 1989 mode1(1)(2)(3)(4)(5)(6)(7). Because the Suspension has no coil springs,improvements in both ride and handling performance are obtained. The Active 4WS controls the rear steering angle by using yaw rate feedback contro1,and this is the world's first system in massproduction car. TOYOTA has integrated the ABS and TRC to these systems in the SOARER. We have succeeded in improving the total vehicle dynamics performance,and have obtained higher maneuver-ability and controllability with a total integrated system. The following describes the effects of integrated control.

A Slow Active Suspension system has the advantage of requiring less energy than a Full Active Suspension system. But for improving vehicle's attitude control, feed-forward control becomes of paramount importance. This paper describes the control algorithms utilized in the Slow Active Suspension system that Toyota has just made available on the Japanese market. Special control items specifically developed for this system are; I ) The parameter Kwt, which is the ratio between the estimated differential value of lateral acceleration from steering angle velocity and that from lateral acceleration sensor in order to realize fast response to transient roll control, II ) Side Slip Judgement, which prevents the feed-forward errors in the case of changing co-efficients of surface friction, III ) Heave control, which prevents the vertical motions caused by heave disturbance force in the suspension cylinders during high-G turns.