G - Physics – 05 – D
Patent
G - Physics
05
D
342/38, 341/97
G05D 3/18 (2006.01) F15B 9/03 (2006.01) G05B 19/414 (2006.01)
Patent
CA 1328002
Abstract of the Disclosure An electrohydraulic system includes a plurality of electrohydraulic devices individually controlled by on-board microprocessor-based control electronics. Each individual device controller is connected to and addressable by a master controller for coordinating operation of the various devices. An electrohydraulic servo valve assembly includes a hydraulic manifold having a valve spool variably positionable therein under control of a torque motor. A microprocessor-based controller is connected to the torque motor and is mounted on the manifold by a cover which encloses and protects both the controller and the torque motor. A watchdog timer in the microprocessor-based controller monitors pulsewidth modulated signals to the torque motor for terminating operation in the event of signal loss. In a preferred embodiment of the invention, the servo valve assembly is coupled to a linear actuator which has its position monitored by an electroacoustic transducer. Improved electronics couple the transducer to the control microprocessor.
534031
Blatter Albert
Cherry Jeffrey P.
Chipp Ronald E.
Kessler James A.
Leemhuis Richard S.
Marks & Clerk
Vickers Incorporated
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