US 11,952,749 B2
Work vehicle, and control device and control method for power machine
Kenichi Yamada, Tokyo (JP); Shogo Miyazaki, Tokyo (JP); Akira Takeno, Tokyo (JP); and Shota Yamawaki, Tokyo (JP)
Assigned to KOMATSU LTD., Tokyo (JP)
Appl. No. 17/289,423
Filed by KOMATSU LTD., Tokyo (JP)
PCT Filed Nov. 7, 2019, PCT No. PCT/JP2019/043760
§ 371(c)(1), (2) Date Apr. 28, 2021,
PCT Pub. No. WO2020/105461, PCT Pub. Date May 28, 2020.
Claims priority of application No. 2018-216736 (JP), filed on Nov. 19, 2018.
Prior Publication US 2021/0372089 A1, Dec. 2, 2021
Int. Cl. E02F 9/22 (2006.01); E02F 9/20 (2006.01); F04D 13/02 (2006.01); F04D 15/00 (2006.01); F15B 15/18 (2006.01); F16H 61/4008 (2010.01); F16H 61/4157 (2010.01); F16H 61/472 (2010.01)
CPC E02F 9/2253 (2013.01) [E02F 9/2004 (2013.01); E02F 9/2292 (2013.01); E02F 9/2296 (2013.01); F04D 13/028 (2013.01); F04D 15/00 (2013.01); F15B 15/18 (2013.01); F16H 61/4008 (2013.01); F16H 61/4157 (2013.01); F16H 61/472 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A control device for a power machine including
a drive source,
a hydraulic pump driven by a driving force of the drive source,
a power take off device configured to transmit a portion of the driving force of the drive source to the hydraulic pump,
a power transmission device including a hydrostatic continuously variable transmission, an input shaft connected to the power take off device, and an output shaft connected to a load, and transmitting the driving force input to the input shaft to the output shaft, and
an operation device that provides an instruction regarding a magnitude of the driving force of the drive source,
the control device comprising:
a target circuit pressure specifying unit configured to specify a target circuit pressure of the hydrostatic continuously variable transmission;
a measurement value acquisition unit configured to acquire an actual circuit pressure of the hydrostatic continuously variable transmission;
a brake torque determination unit configured to determine a brake torque based on the target circuit pressure and the actual circuit pressure, the brake torque being a torque consumed by the hydraulic pump; and
a pump control unit configured to control the hydraulic pump based on the brake torque.