B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
137/95
B29C 45/77 (2006.01) B29C 45/82 (2006.01) F15B 13/04 (2006.01)
Patent
CA 1305644
ABSTRACT OF THE DISCLOSURE An electrohydraulic servo system for controlling pressure of fluid in a cavity of undetermined volume includes a valve having a valve spool element and ports for supplying fluid as a function of position of the valve element within the surrounding valve body. A servo valve is responsive to electronic valve control signals for controlling pilot pressure within the main valve body and thereby controlling position of the valve element. An electronic valve controller receives a pressure command signal from remote master electronics as a function of desired fluid pressure within the cavity volume, and a pressure feedback signal indicative of fluid pressure within the cavity volume from a pressure sensor coupled to the valve output ports. The pressure command signal is compared to the pressure feedback signal in a pressure-control mode of operation, and a difference or error signal is employed for generating valve control signals to the servo valve. A second sensor is coupled to the valve element for supplying a position feedback signal as a function of position of the valve element within the surrounding valve body. Both position and pressure feedback signals also employed in the pressure control feedback loop, with the pressure feedback signal being varied as a function of a gain Kp, the position feedback signal being varied as a function of the gain Kd, and the difference or error signal being varied as a function of the gain Ke. Cavity volume is determined as a function of the pressure and position feedback signals. Control loop gains, specifically gains Ke and Kd, are varied as a function of cavity volume for thereby adapting the servo control system for either intended or unintended variations in cavity volume.
592716
Gunda Rajamouli
Marks & Clerk
Vickers Incorporated
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