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US 5,177,965 AGranted
Pump control system with limit signal generated at a given displacement setting
OwnerHeinrich Nikolausinventor
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OwnerHeinrich Nikolausinventor
Estimating the term…
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.
A circuitry for controlling control coils of servo devices in a hydraulic system, in particular for controlling hydraulic valves for adjusting a predetermined flow of fluid to at least a consumer and for adjusting the delivery rate of at least a variable displacement pump, comprising means for increasing the pump delivery rate in response to a requirement of said a consumer and means for decreasing the delivery rate to said a consumer in response to a hydraulic under-supply in the hydraulic system, characterized in that an electrical limit signal is generated in response to an unsufficient capacity of the pump which signal is delivered to an electronic control circuit for controlling the control coil of at least a servo device to decrease the flow delivery rate to said a consumer;
Dependencies are inferred from the claim text.