Motors: expansible chamber type – Working member position feedback to motive fluid control – Electrical input and feedback signal means
Patent
1989-02-01
1991-01-15
Look, Edward K.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Electrical input and feedback signal means
91457, 91527, 91536, 13759617, 1376374, F15B 1316
Patent
active
049845055
ABSTRACT:
A time division multiplexed (TDM) hydraulic control system having a plurality of channels, each channel having a servo actuator. Electrical demand signals are arranged in TDM sequence and applied to a single multiplexed pilot valve so that the pilot valve produces a plurality of hydraulic signals. Commutator means are associated with the pilot valve for distributing the hydraulic signals to the associated channels. In order to achieve useful output flow rates in the channels, each channel includes a second stage valve which integrates the hydraulic signals for its channel to produce an output flow rate which is a function of the integrated signal. The flow rates are continuously produced (as compared to the multiplexed output signals) and are coupled to actuators in the channels for controllably adjusting the position thereof. Feedback means associated with the actuators includes rate feedback for stabilizing the multiplexed control loops.
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Leeson Plato J.
Wardle John W.
Look Edward K.
Woodward Governor Company
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