ACTIVE SUSPENSION WITH OFFLOAD ADJUSTMENT

摘要

An active suspension system for supporting a mass, such as a seat on a base of a vehicle includes a hydraulic actuator coupled between the seat and the base, an pneumatic off-load device between the seat and the base, and a control system which actively controls the hydraulic actuator and which controls the off-load member. The control system actively controls the hydraulic actuator as a function of a seat position error signa l. The control system also controls the off-load member as a function of a signal used in t he active control of the actuator. A compressor and a vent are coupled to the pneumatic device for controlling pressurization thereof. The control system comprises an electronic control unit which repeatedly executes a control algorithm at a predetermined rate, and which controls the operational status of the compressor and the vent as a function of the position error signal and the predetermined rate.