Circuitry for controlling control coils of servo devices in a hy

Details Circuitry for controlling control coils of servo devices in a hy Circuitry for controlling control coils of servo devices in a hy

1990-12-21

1992-11-03

Look, Edward K.

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

60459, 60465, F15B 1116, F04B 108, H01F 718

Patent

active

051598124

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, preferrably 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.

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