Closed loop control circuit for variable hydraulic pump
AssigneeMannesmann Rexroth GmbH
InventorsGunter Fischer, Rainer Knoll
Life of this patent
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Abstract
Closed loop control circuit for a variable hydraulic pump the output flow of the pump being variable by control means and the pump including at least two closed loop controllers actuating the control means, wherein at least one hydraulic switching element is provided which automatically connects to the control means the closed loop controller providing the highest or the lowest pressure.
Claims8
A closed loop control circuit for a variable displacement pump, the output flow of the pump being varied by control means, the control circuit comprising:
- at least two closed loop controllers adapted to actuate the control means by control signals, and
- at least one hydraulic switching valve connected between the closed loop controllers and the control means, wherein the control signals provided by the closed loop controllers are present as pressure signals and the switching valve selects the higher one of said control signals and passes the higher control signal to the control means so as to vary the displacement of the pump.
A closed loop control circuit for a variable displacement hydraulic pump, the output flow of which being varied by control means, the control circuit comprising:
- at least two closed loop controllers adapted to actuate said control means by control signals, and at least one hydraulic switching valve connected between said closed loop controllers and the control means, wherein the control signals provided by said closed loop controllers are present as pressure signals and the switching valve selects the lower one of said signals and passes the lower control signal on to said control means, so as to vary the displacement of said pump.
Dependencies are inferred from the claim text.