High performance controller for variable displacement hydraulic

Details High performance controller for variable displacement hydraulic High performance controller for variable displacement hydraulic

1990-05-25

1991-09-17

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

318626, 318567, 318561, 417217, 417222S, 91506, G05B 106

Patent

active

050497995

ABSTRACT:
In a control (100) for a variable displacement hydraulic motor (12) having an electrically controlled hydraulic servo valve (14) for controlling the displacement of a hydraulic motor by varying position of a wobbler (28) in response to a servo valve control signal, a velocity transducer (72), coupled to a shaft (30) driven by the motor, for providing a velocity signal representative of the velocity of the shaft, and a wobbler position sensor (84), coupled to the wobbler, for producing a wobbler position signal indicative of the position of the wobbler, an improvement in accordance with the invention includes a controller (100) for producing the servo valve control signal as a function of a wobbler position command specifying a position of the wobbler wherein the wobbler position command is a function of at least one of the velocity signal representative of the velocity of the shaft and the wobbler position signal.

REFERENCES:
patent: 4474104 (1984-10-01), Creffield
patent: 4487109 (1984-12-01), Burandt et al.
patent: 4498037 (1985-02-01), Razavi
patent: 4733149 (1988-03-01), Culberson
patent: 4801857 (1989-01-01), Bundy
patent: 4950967 (1990-08-01), Sakamoto et al.

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