Abstract: A novel digital servo valve system for use in displacing an actuator is capable of operating either in closed or open loop mode. The system includes a controller that compares computed values of actuator parameters with preselected parameter values and iteratively determines therefrom command signals for the servo valve. The servo valve is characterized by a ball screw mechanism that eliminates mechanical backlash and a torsion bar which increases radial and angular compliance. A servo valve provided according to the present invention also displays reduced flow forces using a simple, inexpensive valve body in combination with a uniquely configured displaceable spool.
Type:
Grant
Filed:
May 16, 1990
Date of Patent:
August 6, 1991
Assignee:
Olson Controls, Inc.
Inventors:
Zenny Olsen, Albert J. Sperbeck, Eric Hamman, Gary D'Angelo