Control system and method for supplying pressure means to at least two hydraulic consumers
AssigneeBosch Rexroth AG
InventorHorst Hesse
Life of this patent
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Abstract
Disclosed are a control arrangement and a method for the pressure medium supply of at least two hydraulic consumers that are supplied with pressure medium through the intermediary of a variable displacement pump. In the pressure medium flow path between the consumers and the variable displacement pump a respective meter-in orifice is provided. An adjustment of the variable displacement pump and of the meter-in orifices takes place electronically through the intermediary of a control means in dependence on the target values input by an operator. In accordance with the invention, the meter-in orifice associated with the consumer having the highest load pressure is controlled to open completely, so that the pressure loss across this meter-in orifice is minimum.
Claims8
A control arrangement for the pressure medium supply of at least two hydraulic consumers, comprising a variable displacement pump arrangement which has a variable capacity, and comprising at least two adjustable meter-in orifices each associated with a respective one of the consumers and respectively adjustable in dependence on a target value set at a target value entry means through the intermediary of a control means, and comprising a means outputting a control signal to the variable displacement pump in dependence on the set target values, characterized by respective sensors provided in the pressure medium flow paths downstream from the meter-in orifices for detecting the individual load pressures, by a means for detecting the consumer having the highest load pressure based on the signals detected by the sensors and for controlling open the meter-in orifice associated with the consumer having the highest load pressure, wherein upstream or downstream from each meter-in orifice a pressure compensator is arranged which is subjected in the closing direction to the pressure upstream from the meter-in orifice, and in the opening direction to the pressure downstream from the associated meter-in orifice.
A method for actuating a control arrangement for the pressure medium supply of at least two hydraulic consumers, comprising a variable displacement pump arrangement which has a variable capacity, and comprising at least two adjustable meter-in orifices each associated with a respective one of the consumers and respectively adjustable in dependence on a target value set at a target value entry means through the intermediary of a control unit, and comprising a means outputting a control signal to the variable displacement pump in dependence on the set target values, characterized in that the individual load pressures of the consumers are detected, and the meter-in orifice associated with the consumer having the highest load pressure is controlled to open completely, wherein upstream or downstream from each meter-in orifice a pressure compensator is arranged which is subjected in the closing direction to the pressure upstream from the meter-in orifice, and in the opening direction to the pressure downstream from the associated meter-in orifice.
Dependencies are inferred from the claim text.