Power plants – Pressure fluid source and motor – Full range correspondence of position of external...
Patent
1981-08-05
1985-07-16
Cohen, Irwin C.
Power plants
Pressure fluid source and motor
Full range correspondence of position of external...
60444, 60452, 417218, F16H 3946
Patent
active
045288135
ABSTRACT:
A control system for a hydrostatic power transmission having a variable displacement hydraulic pump (2) and a hydraulic actuator (3) connected in a closed or semi-closed circuit, wherein the displacement of the pump or the delivery thereby is adjustable in accordance with a manipulated variable of an operating lever (13). A control unit of the system (16) is operative to calculate a hydraulic pump displacement command (X) on the basis of a manipulated variable signal (X.sub.L) and circuit pressure signals (Pa, Pb) in such a manner that when the delivery side circuit pressure is higher than the suction side circuit pressure, the displacement is controlled to change in accordance with the manipulated variable while the rate of change in the displacement is controlled to change a maximum rate when the circuit pressure on the delivery side is below a pressure value that varies in dependence on the manipulated variable and is reduced once it is reached, while pump displacement is changed in response to the suction side circuit pressure, when it is higher than the delivery side pressure, in a similar manner except that a constant value is used instead of a value which varies in dependence on the manipulated variable.
REFERENCES:
patent: 3744243 (1973-07-01), Faisandier
patent: 3898807 (1975-08-01), Habiger
patent: 3901031 (1975-08-01), Knapp et al.
patent: 4189921 (1980-02-01), Knapp
patent: 4355506 (1982-10-01), Leonard
patent: 4369625 (1983-01-01), Izumi et al.
Aoyagi Yukio
Honma Kazuo
Izumi Eiki
Nakajima Kichio
Watanabe Hiroshi
Cohen Irwin C.
Hitachi Construction Machinery Co. Ltd.
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