Circuit pressure control system for hydrostatic power transmissi

Details Circuit pressure control system for hydrostatic power transmissi Circuit pressure control system for hydrostatic power transmissi

1981-06-04

1985-04-16

Garrett, Robert E.

Power plants

Pressure fluid source and motor

Servo-motor having externally operated control valve sets...

60444, 60452, 417217, 417218, 417222, F16D 3302

Patent

active

045107505

ABSTRACT:
A circuit pressure control system for a hydrostatic power transmission having a variable-displacement hydraulic pump driven by a prime mover, a hydraulic actuator for actuating a load and a displacement adjusting mechanism for the hydraulic pump. The hydraulic pump and actuator are connected together in closed or semi-closed circuit, and the displacement adjusting mechanism is actuated by a signal indicative of the operating lever manipulated variable and a signal indicative of the actual displacement of the hydraulic pump to control the speed of the hydraulic actuator. The circuit pressure control system is provided with a sensor for sensing the circuit pressure of the hydrostatic power transmission and generating a signal indicative of the sensed circuit pressure, a device for calculating based on the manipulated variable and circuit pressure signal a hydraulic pump displacement command that causes the displacement of the hydraulic pump to be changed at a maximum rate when the circuit pressure is below a predetermined value and causes the changing rate of the displacement to be reduced when the predetermined value is exceeded thereby, and a device for comparing the displacement command with the actual displacement of the hydraulic pump and producing a signal for decreasing the difference between them and supplying such signal to the displacement adjusting mechanism.

REFERENCES:
patent: 3744243 (1973-07-01), Faisandier
patent: 4103489 (1978-08-01), Fletcher et al.
patent: 4199944 (1980-04-01), Budzich
patent: 4282711 (1981-08-01), Branstetter
patent: 4369625 (1983-01-01), Izumi et al.

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