| 摘要 |
<p>A suspension control unit as well as a control valve for such unit are provided which are incorporated in a computerized suspension system which automatically and continuously monitors and controls a vehicle's ride performance. The suspension control unit is composed of an actuator (12) and a fluid control unit (10). The actuator has a piston (16) with rod dividing the actuator into a first (18) and second (20) chambers that are connected to the fluid control unit. The fluid control unit comprises a reservoir (32) which receives fluid from the actuator chambers. A position sensor (30) is fitted within the reservoir for providing signals for ascertaining the position of the piston (46) with rod (42) within actuator. At least one valve is provided for controlling the pressure of fluid exiting from the first and second chambers of the actuator, thus, controlling the pressure in the actuator's chambers and thereby, controlling the damping provided by such actuator. The valve has an annular body (72) having a side inlet passage (154) and an outlet opening (64a) in communication with the reservoir. A poppet (74) driven by a solenoid (80) is slideably fitted within the body wherein the poppet can slide between a first position blocking flow to the outlet opening and a second position not blocking the flow to the outlet opening. The poppet of each valve has a shoulder (148) that is exposed to the inlet. Fluid pressure to the inlet of the valve acts on the differential area of the poppet to produce a poppet retracting force which is opposed by the force of an electrically adjustable solenoid. When pressure reaches the solenoid setting, the poppet is retracted to the open position, permitting flow through the valve.</p> |
