Control system for variable displacement pumps and motors

Details Control system for variable displacement pumps and motors Control system for variable displacement pumps and motors

1983-04-11

1984-10-02

Freeh, William L.

Motors: expansible chamber type

Three or more cylinders arranged in parallel radial or...

Radially disposed cylinders

60447, 60448, 417221, F01B 2506

Patent

active

044741049

ABSTRACT:
A hydraulic motor control system comprises a speed control loop and a pressure control loop which provide closed loop control of a variable displacement chamber space and the mechanical advantage coupling thereof to the motor output shaft. The speed control loop is effective in the speed control mode of operation to maintain a set speed within a given load range. In response to load increases beyond said range, the pressure control loop pre-empts the speed control loop so that the control operates in a constant horsepower mode.

REFERENCES:
patent: 3628330 (1971-12-01), Miller
patent: 3810715 (1974-05-01), Week
patent: 4103489 (1978-08-01), Fletcher
patent: 4320692 (1982-03-01), Komiya
patent: 4351152 (1982-03-01), Reynolds

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