| 摘要 |
A mechanical controller (10) for a hydraulically controlled system, the controller including: a valve housing (27)including an inner chamber (28), a hydraulic fluid input port (22) and a hydraulic fluid output port (26), wherein the hydraulic fluid output port is connectable to the hydraulically controlled system (14,15); a bushing (32) mounted in the inner chamber, the bushing having a bushing port (40,42) that is movable into and out of alignment with the control and (44) of a pilot value (34) to control hydraulic fluid flow through the valve; a bushing actuator (38) coupled to move the bushing in the inner chamber based on a first operational condition (13,58) of the hydraulically controlled system; a pilot valve (34) slidably mounted in the bushing, the pilot valve having a flow passage (44) which allows hydraulic fluid to flow through the bushing when in a first position in the bushing and prevents the flow of hydraulic fluid when the pilot valve is in a second position in the bushing; a pilot valve actuator (46) coupled to move the pilot valve between the first position and the second position based on an error signal (56), the error signal generated on a comparison of a set point (48) and a second operating condition (54) of the hydraulically controlled system.
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