Stabilized hydromechanical servo system
First Claim
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1. In a hydromechanical servo system, a hydraulic cylinder containing a piston, valve means for supplying fluid to said cylinder to actuate said piston, damping means for damping operation of said valve means, mechanical control means for operating said valve means, and mechanical feedback means connected between said piston, valve means and control means, the improvement comprising;
- limited motion yieldable means for providing limited yielding movement of said feedback means at predetermined frequencies prior to operation of said valve means by forces acting through said feedback means.
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Abstract
A hydromechanical servo system having mechanical feedback is stabilized by damping the control valve and providing limited motion yieldable means for allowing limited yielding movement of feedback means relative to biasing means which biases such feedback means to a passive position.
10 Citations
17 Claims
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1. In a hydromechanical servo system, a hydraulic cylinder containing a piston, valve means for supplying fluid to said cylinder to actuate said piston, damping means for damping operation of said valve means, mechanical control means for operating said valve means, and mechanical feedback means connected between said piston, valve means and control means, the improvement comprising;
- limited motion yieldable means for providing limited yielding movement of said feedback means at predetermined frequencies prior to operation of said valve means by forces acting through said feedback means.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- 9. In a hydromechanical servo system, a hydraulic cylinder containing a movable piston for controlling the position of a controlled member, valve means for selectively supplying fluid to said cylinder to selectively extend and retract said piston, mechanical control input means for operating said valve means, summing link means for providing input and feedback for said system, said summing link means providing a connection between said piston and valve means and being connected with said control input means at an input connection, biasing means for biasing said input connection to a passive position under predetermined biasing force, limited motion yieldable means for providing limited movement of said input connection relative to said biasing means under influence of feedback forces applied to said summing link means, and damping means for damping operation of said valve means during such limited movement of said input connection.
- 14. In a hydromechanical servo system, valve means for supplying fluid to a cylinder to actuate a piston, damping means for damping operation of said valve means, summing link means for providing input to said valve means and feedback from said piston, and limited motion yieldable means for providing limited movement of said summing link means under influence of feedback forces applied to said summing link means, said damping means precluding operation of said valve means during such limited movement of said summing link means.
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17. In a hydromechanical servo system, valve means for supplying fluid to a part of such system and summing means connected with said valve means for providing control input to said system for operating said valve means and for providing feedback for a part of such system, the improvement comprising;
- valve damping means for damping the movements of said valve means to prevent significant movement thereof at predetermined frequencies without application of relatively high force thereto, and limited motion yieldable means for providing limited movement of said summing means under influence of feedback forces applied thereto without causing significant movements of said valve means.
Specification