| 摘要 |
<p>609,805. Fluid-pressure servo motor-control systems. POLSON, R. A., METROPOLITAN VICKERS ELECTRICAL CO., Ltd., and VICKERS-ARMSTRONGS, Ltd. April 28, 1943, No. 6743. [Class 135] A control-system for a power-driven movable object has means responsive to the fluid pressure applied to the power device coupled by means of a dashpot or equivalent means transmitting a force increasing with the rate of change of displacement of said pressure responsive means, with a movable element controlling the supply of liquid to the engine so as to superimpose on the response of the control means to the misalignment between the movable object and the primary control member a response dependent on said pressure and the rate of change thereof and acting in the direction to oppose changes in said pressure. As shown in the Figure, the movable object is moved by a simple hydraulic ram or by a rotary hydraulic engine 2 supplied by a variable delivery pump 7. The pump is regulated by a member 8 actuated by a doubleacting piston 9 under the control of a valve 16. This valve is actuated by a floating lever 29 connected at one end to a moving coil relay device 1 as described in Specification 592,208, so as to receive a displacement dependent upon. the misalignment between the movable object and the control member and upon the first time derivative of said misalignment or the relay may be responsive to the misalignment alone. The other end of the floating lever is loaded by a spring 30 and is coupled to a dashpot piston working in a cylinder 28 connected by a link 27 with a lever 24 turning on a fixed pivot 25. This lever is loaded towards its mid-position by opposed springs 26 and is actuated by a pair of opposed pistons 17, 18 working in cylinders 19, 20 connected by conduits 21, 22 to the conduits 5, 6 connecting the hydraulic engine with the variable delivery pump. In a modification, the hydraulic engine is controlled by a piston valve with tapered ends coupled to the piston 9. In this form the cylinder 28 is connected to the mid-point of a second floating lever connected at one end to the lever 24 and at the other to the piston 9. Specification 609,804 also is referred to.</p> |
