Power plants – Pressure fluid source and motor – Control relative to independently driven oscillator – speed...
Patent
1979-09-24
1982-09-28
Cohen, Irwin C.
Power plants
Pressure fluid source and motor
Control relative to independently driven oscillator, speed...
60448, 60449, 60DIG2, F16H 3946
Patent
active
043511520
ABSTRACT:
An electronic constant speed control for a hydrostatic transmission having a variable displacement hydraulic pump with a displacement controlling member movable to various positions at either side of a neutral position and having an input shaft connectable to a prime mover and a hydraulic motor having an output shaft, an electric controller for positioning siad displacement controlling member, a command potentiometer for establishing a set constant speed signal representing a desired constant speed between zero and maximum speed in either direction of rotation for said output shaft, a speed detecting device for establishing a pump input shaft speed signal, a circuit for generating a position control signal representing the required position of the displacement controlling member for the set speed which is responsive to the constant speed and pump input shaft speed signals, a speed detecting device for establishing an output shaft speed signal, a circuit for comparing the output shaft speed signal with said set constant speed signal and integrating any error therebetween and generating a speed error control signal, and a summing circuit for summing said position and speed error control signals to provide a control signal to said electric controller.
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Klimowicz, A Hydrostatic Transmission with Electronic Controls Used as a Power Take-off on a Large Articulated Farm Tractor, pp. 336-339.
Reyonlds et al., Electronic Constant Output Shaft Speed Control for a Fluid Power Drive, Sundstrand Corporation Invention Disclosure, from a Book of Papers presented at the National Conference on Fluid Power on or about Sep., 1977.
Foley Daniel J.
Myers Allen
Reynolds Richard W.
Cohen Irwin C.
Sundstrand Corporation
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