US 12,402,550 B2
Work machine
Kohei Ono, Sakai (JP); and Masahiro Yamada, Sakai (JP)
Assigned to Kubota Corporation, Osaka (JP)
Filed by Kubota Corporation, Osaka (JP)
Filed on Jul. 12, 2024, as Appl. No. 18/771,023.
Claims priority of application No. 2023-115036 (JP), filed on Jul. 13, 2023.
Prior Publication US 2025/0017124 A1, Jan. 16, 2025
Int. Cl. A01B 63/10 (2006.01); A01B 63/102 (2006.01); A01B 63/108 (2006.01); E02F 9/20 (2006.01); E02F 9/22 (2006.01); F15B 15/18 (2006.01)
CPC A01B 63/108 (2013.01) [A01B 63/1013 (2013.01); A01B 63/102 (2013.01); E02F 9/2004 (2013.01); E02F 9/2203 (2013.01); F15B 15/18 (2013.01); F15B 2211/63 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A work machine, comprising:
a hydraulic actuator;
a manual operating tool configured to operate the hydraulic actuator;
an operation amount detector configured to detect an operation amount of the manual operating tool;
a hydraulic pump configured to generate a hydraulic pressure to be supplied to the hydraulic actuator;
an electric pump motor configured to change an output characteristic of the hydraulic pump in response to a rotary force to be given to the hydraulic pump;
a motor load detector configured to detect a motor load of the pump motor;
a pump motor controller configured to determine the output characteristic based on the operation amount and the motor load and control the pump motor based on the output characteristic; and
a workload estimator configured to estimate a workload of the hydraulic actuator based on the operation amount, wherein the pump motor controller determines a necessary output characteristic based on the operation amount and the workload and controls the pump motor based on the output characteristic.