Flow management of a hydraulic system
AssigneeDeere & Company
InventorsAaron M. Quinn, Dwayne A. Nystrom, Nicholas R. Hensch
Life of this patent
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Abstract
A hydraulic system for a work vehicle includes a first pump with a first swashplate providing a first flow in a first circuit and a second pump with a second swashplate providing a second flow in a second circuit. A supplemental pump with a supplemental swashplate provides a supplemental flow to a supplemental circuit. A first valve selectively enables flow from the supplemental circuit to the first circuit. A second valve selectively enables flow from the supplemental circuit to the second circuit. A controller determines to operate the supplemental pump in one of a standby condition and a use condition based in part on a first angle of the first swashplate and a second angle of the second swashplate.
Claims20
A hydraulic system for a work vehicle comprising:
- a first pump having a first swashplate, the first pump providing a first flow in a first circuit to a first plurality of selective control valves;
- a first load sense circuit connected to a first load sensing compensator of the first pump;
- a first pressure sensor measuring a first pressure in the first circuit;
- a first swashplate angle sensor measuring a first angle of the first swashplate;
- a second pump having a second swashplate, the second pump providing a second flow in a second circuit to a second plurality of selective control valves;
- a second load sense circuit connected to a second load sensing compensator of the second pump;
- a second pressure sensor measuring a second pressure in the second circuit;
- a second swashplate angle sensor measuring a second angle of the second swashplate;
- a supplemental pump having a supplemental swashplate, the supplemental pump providing a supplemental flow to a supplemental circuit, the supplemental pump operating at a lower flow in a standby condition and a higher flow in a use condition;
- a supplemental load sense circuit connected to a supplemental load sensing compensator of the supplemental pump;
- a supplemental pressure sensor measuring a supplemental pressure in the supplemental circuit;
- a first valve selectively enabling flow from the supplemental circuit to the first circuit when the supplemental pressure is equal to or greater than the first pressure;
- a second valve selectively enabling flow from the supplemental circuit to the second circuit when the supplemental pressure is equal to or greater than the second pressure;
- and
- a controller determining to operate the supplemental pump in one of the standby condition and the use condition based in part on the first angle of the first swashplate and the second angle of the second swashplate.
A method of providing supplemental flow for a hydraulic system of a work vehicle comprising:
- adjusting a first swashplate of the first pump via a first load sense circuit connected to the first pump to provide a first flow in a first circuit to a first plurality of selective control valves;
- measuring a first pressure in the first circuit via a first pressure sensor;
- measuring a first angle of the first swashplate of the first pump via a first swashplate angle sensor;
- adjusting a second swashplate of the second pump via a second load sense circuit connected to the second pump to provide a second flow in a second circuit to a second plurality of selective control valves;
- measuring a second pressure in the second circuit via a second pressure sensor;
- measuring a second angle of the second swashplate of the second pump via a second swashplate angle sensor;
- adjusting a supplemental swashplate of the supplemental pump via a supplemental load sense circuit connected to the supplemental pump to provide a lower flow in a standby condition and a higher flow in a use condition to a supplemental circuit;
- measuring a supplemental pressure in the supplemental circuit via a supplemental pressure sensor;
- selectively enabling flow from the supplemental circuit to the first circuit via a first valve when the supplemental pressure is equal to or greater than the first pressure;
- selectively enabling flow from the supplemental circuit to the second circuit via a second valve when the supplemental pressure is equal to or greater than the second pressure;
- and
- determining via a controller to operate the supplemental pump in one of the standby condition and the use condition based in part on one or more of the first pressure of the first pump, the first angle of the first swashplate, the second pressure of the second pump, and the second angle of the second swashplate.
Dependencies are inferred from the claim text.