Work vehicle, and control device and control method for power machine
AssigneeKomatsu Ltd.
InventorsKenichi Yamada, Shogo Miyazaki, Akira Takeno, Shota Yamawaki
Life of this patent
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Abstract
A control device for a power machine includes 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, and a pump control unit configured to control the hydraulic pump based on the brake torque. The brake torque is a torque consumed by the hydraulic pump.
Claims6
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.
A control method for a power machine including
- a drive source,
- a traveling device driven by a driving force of the drive source,
- a hydraulic pump driven by the 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 the traveling device, and transmitting the driving force input to the input shaft to the output shaft, and
- an operation device for providing an instruction regarding a magnitude of the driving force of the drive source,
- the control method comprising:
- specifying a target circuit pressure of the hydrostatic continuously variable transmission;
- acquiring an actual circuit pressure of the hydrostatic continuously variable transmission;
- determining 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
- controlling the hydraulic pump based on the brake torque.
Dependencies are inferred from the claim text.