Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1992-04-24
1993-01-12
Look, Edward K.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
F16D 3102
Patent
active
051779650
ABSTRACT:
The invention refers to a hydraulic system comprising at least a variable displacement pump and at least a consumer. Means are provided to generate electrical limit signals when at least one of the consumers, preferably a load leading consumer indicates the need for an increased delivery rate or when the variable displacement pump indicates a hydraulic under-supply. In response to the limit signals generated by the consumer need or the pump are varied in a control circuit to adjust the control signals delivered to the servo devices of the hydraulic systems such that the pump control is optimized and that the flow rates to the consumers are decreased in the mode of under-supply. In addition very simple electrical circuits are disclosed to substantially reduce the expenditure of the system.
REFERENCES:
patent: 3579987 (1971-05-01), Busse
patent: 3901031 (1975-08-01), Knapp et al.
patent: 4189921 (1980-02-01), Knapp
patent: 4456434 (1984-06-01), El Ibiary
patent: 4822252 (1989-04-01), Ishikawa et al.
patent: 5046927 (1991-09-01), Ohno et al.
Look Edward K.
Ryznic John
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