US 11,913,195 B2
Hydraulic machine
Sangki Bae, Changwon-si (KR); Donguk Choi, Changwon-si (KR); Gyeongmo Min, Busan (KR); and Byeongsoo Kim, Changwon-si (KR)
Assigned to VOLVO CONSTRUCTION EQUIPMENT AB, Eskilstuna (SE)
Filed by VOLVO CONSTRUCTION EQUIPMENT AB, Eskilstuna (SE)
Filed on Jan. 10, 2023, as Appl. No. 18/095,200.
Claims priority of application No. 10-2022-0010805 (KR), filed on Jan. 25, 2022.
Prior Publication US 2023/0235537 A1, Jul. 27, 2023
Int. Cl. E02F 9/22 (2006.01); E02F 9/20 (2006.01); F15B 11/17 (2006.01); F15B 15/18 (2006.01)
CPC E02F 9/2235 (2013.01) [E02F 9/2004 (2013.01); E02F 9/2228 (2013.01); E02F 9/2292 (2013.01); E02F 9/2296 (2013.01); F15B 11/17 (2013.01); F15B 15/18 (2013.01); E02F 9/2285 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A hydraulic machine comprising:
an actuator;
a first pump and a second pump configured to supply pressurized fluid to the actuator;
a driving motor configured to drive the first and second pumps;
a first operator input device through which an operator's desire to operate the actuator is input; and
a controller,
wherein the controller is configured to:
a) determine first and second displacements of the first and second pumps corresponding to the operator's desire and a speed of rotation of the driving motor; and
b) control the first pump, the second pump, and the driving motor to operate according to the determined displacements of the first and second pumps and the speed of rotation of the driving motor,
wherein the determination of the first and second displacements comprises an operation a1) in which the controller determines desired first and second flow rates of the first and second pumps corresponding to the operator's desired input through the first operator input device, determines a maximum displacement of the first and second pumps, determines first and second speeds of rotation at which the first and second pumps discharge the first and second flow rates with the maximum displacement, and determines a first value according to the first and second speeds of rotation.