US 11,834,811 B2
System and method for controlling hydraulic pump operation within a work vehicle
Francesco Pintore, Modena (IT); Stefano Fiorati, Ferrara (IT); Andrea Vacca, West Lafayette, IN (US); and Xin Tian, Lafayette, IN (US)
Assigned to CNH Industrial America LLC, New Holland, PA (US)
Filed by CNH Industrial America LLC, New Holland, PA (US)
Filed on Oct. 25, 2021, as Appl. No. 17/509,426.
Prior Publication US 2023/0128642 A1, Apr. 27, 2023
Int. Cl. E02F 9/22 (2006.01); F15B 11/16 (2006.01)
CPC E02F 9/2228 (2013.01) [E02F 9/2285 (2013.01); E02F 9/2296 (2013.01); F15B 11/165 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A system for controlling pump operation within a work vehicle, the system comprising:
a pump including a swash plate, the pump configured to discharge hydraulic fluid into a fluid supply conduit for delivery to first and second hydraulic loads of an associated agricultural implement, the first hydraulic load being in parallel with the second hydraulic load;
first and second fluid conduits fluidly coupled between the fluid supply conduit and the first and second hydraulic loads, respectively;
first and second bleed conduits fluidly coupled to the first and second fluid conduits, respectively;
a shuttle valve fluidly coupled to the first and second bleed conduits;
a load sense conduit fluidly coupled to the shuttle valve, the load sense conduit configured to receive a portion of the hydraulic fluid from the first or second fluid conduit in which the hydraulic fluid is at a greater pressure; and
a pump compensator assembly configured to control the operation of the pump, the pump compensator assembly comprising:
a pump regulation actuator configured to adjust a position of the swash plate based on a flow of the hydraulic fluid received from the load sense conduit or the fluid supply conduit;
a flow compensator valve fluidly coupled to the load sense conduit, the flow compensator valve configured to at least partially control the flow of the hydraulic fluid to the pump regulation actuator; and
an electronically controlled pressure compensator valve fluidly coupled to the load sense conduit, the electronically controlled pressure compensator configured to at least partially control the flow of the hydraulic fluid to the pump regulation actuator, wherein the electronically controlled pressure compensator valve comprises a two-position proportional valve and an electric actuator configured to move the electronically controlled pressure compensator valve between first and second positions.
 
14. A system for controlling pump operation within a work vehicle, the system comprising:
a pump including a swash plate, the pump configured to discharge hydraulic fluid into a fluid supply conduit for delivery to first and second hydraulic loads of an associated agricultural implement, the first hydraulic load being in parallel with the second hydraulic load;
first and second fluid conduits fluidly coupled between the fluid supply conduit and the first and second hydraulic loads, respectively;
first and second bleed conduits fluidly coupled to the first and second fluid conduits, respectively;
a shuttle valve fluidly coupled to the first and second bleed conduits;
a load sense conduit fluidly coupled to the shuttle valve, the load sense conduit configured to receive a portion of the hydraulic fluid from the first or second fluid conduit in which the hydraulic fluid is at a greater pressure; and
a pump compensator assembly configured to control the operation of the pump, the pump compensator assembly comprising:
a pump regulation actuator configured to adjust a position of the swash plate based on a flow of the hydraulic fluid received from the load sense conduit or the fluid supply conduit;
a flow compensator valve fluidly coupled to the load sense conduit, the flow compensator valve configured to at least partially control the flow of the hydraulic fluid to the pump regulation actuator; and
an electronically controlled pressure compensator valve fluidly coupled to the load sense conduit, the electronically controlled pressure compensator configured to at least partially control the flow of the hydraulic fluid to the pump regulation actuator, wherein, when the electronically controlled pressure compensator valve at the second position, the electronically controlled pressure compensator valve supplies the hydraulic fluid from the fluid supply conduit to the flow compensator valve.