Patent ID: 7333882
Filing Date: 2008-02-19
Classification: B60G

Abstract:
1. A suspension control system comprising: a damping characteristic controllable shock absorber provided between a sprung mass member and an unsprung mass member of a vehicle, said shock absorber being arranged such that damping characteristics are adjustable between “soft” and “hard” damping characteristics; a sprung mass vertical acceleration detecting device that detects a vertical acceleration of the sprung mass member and outputs a sprung mass vertical acceleration signal; an unsprung mass vertical acceleration detecting device that detects a vertical acceleration of the unsprung mass member and outputs an unsprung mass vertical acceleration signal, said unsprung mass vertical acceleration detecting device being provided on the unsprung mass member; and a controller that outputs a control signal for controlling said damping characteristic-controllable shock absorber from said sprung mass vertical acceleration signal and said unsprung mass vertical acceleration signal; wherein said controller comprises: a sprung mass vibration damping signal computing section that computes a sprung mass vibration damping signal on the basis of said sprung mass vertical acceleration signal; an unsprung mass vibration damping signal computing section that computes an unsprung mass vibration damping signal on the basis of said unsprung mass vertical acceleration signal; and a desired damping characteristic control signal computing section that computes said control signal on the basis of said sprung mass vibration damping signal and said unsprung mass vibration damping signal, and wherein said unsprung mass vibration damping signal computing section computes said unsprung mass vibration damping signal so that said unsprung mass vibration damping signal leads in phase a vertical velocity of the unsprung mass member.