| 摘要 |
<p>2074367 9112452 PCTABS00006 A proportional pressure control valve is disclosed which may be used for uni-directional or bi-directional fluid flow. An electromagnetic driver (35, 251, 360) mounted in a driver cavity (36, 353) of a housing produces a magnetic flux path in response to a variable input current. The magnitude of the flux path is substantially proportional to the input current. The flux path passes through an armature (40, 276) which is movable within the driver cavity. The armature is connected to a metering spool (64, 209, 260) so that the two move in unison. The metering spool is movable within a main bore between a sealing position and an infinite number of open positions. The position of the metering spool determines the magnitude of fluid communication between pressure ports. A feedback section (85, 98) of the housing establishes a pressure feedback force which impacts on the position of the metering spool and the armature. The valve may also include a spring (272) for biasing the metering spool to a fail-safe position within the housing. The proportional pressure control valve can be incorporated into a damper of a vehicle suspension system where the input current is governed by an electronic control unit (56) of the vehicle. The electronic control unit (56) may be responsive, in part, to the position of the suspension system through the use of a position feedback sensor (101).</p> |
