System for vehicle body roll control detecting and compensating for

Abstract

In this system for vehicle roll control, one actuator assembly is provided corresponding to each vehicle wheel and resiliently suspends it from the vehicle body. Each of these actuator assemblies is adapted to increase or decrease the vehicle height at its vehicle wheel as a result of a control signal being supplied. Control means are provided corresponding to the actuator assemblies and serve to supply control signals to them. A vehicle speed detecting means senses road speed, a steering angle detecting means senses steering angle, a means senses the rate of change of steering angle, and a means detects the actual roll angle .phi..sub.t of the vehicle body. A computing and control means computes a steady state roll angle .phi..sub..infin. of the vehicle body from the vehicle speed and the steering angle, advances the phase of a signal representative of the steady state roll angle .phi..sub..infin. to thereby compute a compensating value .PHI..sub..infin. of roll angle, computes an amendment value .phi..sub.x of roll angle in accordance with the rate of change of steering angle, computes the difference .phi. based upon the desired roll angle .phi..sub.a of the vehicle body, the compensating value .PHI..sub..infin., the amendment value .phi..sub.x, and the actual roll angle .phi..sub.t following the equation: .phi.=.phi.a- (k.sub.1 .PHI..sub..infin. +k.sub.2 .PHI.t+k.sub.3 .PHI.x), where k1, k2 and k3 are positive constants; and controls the actuator assemblies, via the control means, in accordance with the difference .phi., when the absolute value of the difference .phi. is larger than a predetermined value.