Patent ID: 6886650
Filing Date: 2005-05-03
Classification: B60N,B60R

Abstract:
1. An active suspension system for supporting a seat on a base of a vehicle, comprising: an actuator coupled between the seat and the base for moving the seat relative to the base; a single accelerometer attached to the base and generating a single base acceleration signal in response to vertical motion of the base; and a control unit which converts the single base acceleration signal into a control signal, and actively controls the actuator as a function of the control signal, the control unit generating a base velocity signal by integrating the base acceleration signal, the control unit generating a seat position signal representing a position of the seat relative to the base, the control unit generating a seat position error signal representing a difference between a desired position and the seat position signal, the control unit generating the control signal as a function of the base velocity signal and of the position error signal, and the control unit controlling the actuator by applying the control signal thereto, the control unit generates the control signal according to the following equation: where K_V_CMD is predetermined valve command gain constant, K2_V_CMD is a valve command offset constant and K_Pos is gain constant.