Abstract: A positioning system includes an actuator, valve (preferably pneumatic), position sensor and an electronic valve controller, integrated in a single unit. Continuously variable setpoints are possible within the range of operation. A preferred control circuit includes a signal converter, a ramp generator to smooth the shape of the command or target value signal applied, a position feedback sensor to report the actual position of the actuator, a controller, and a driver, containing an H-bridge, for controlling the pneumatic valve which feeds air into the actuator mechanism. Integration of all these components into a single unit shortens signal paths, improves resistance to electrical noise, and permits faster response time.
Type:
Grant
Filed:
August 22, 2005
Date of Patent:
July 22, 2008
Assignee:
Enfield Technlogies, LLC
Inventors:
Vincent P. McCarroll, R. Edwin Howe, Blake D. Carter, Daniel S. Cook