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US 11,028,558 B2Granted
Work vehicle and control method for work vehicle
AssigneeKomatsu Ltd.
InventorTakahisa Oasa
Life of this patent
Estimating the term…
Abstract
A controller determines a compensation factor from an operating amount of an accelerator operating member and a hydraulic pressure of at least one of a first circuit and a second circuit. The controller determines a target vehicle speed from the operating amount of the accelerator operating member. The controller determines at least one of a target displacement of a travel pump and a target displacement of a travel motor from the target vehicle speed and the compensation factor.
Claims13
A work vehicle comprising:
- an engine;
- a hydrostatic transmission including
- a travel pump configured to be driven by the engine, the travel pump including a first pump port and a second pump port,
- a travel motor including a first motor port and a second motor port, and
- a hydraulic circuit connecting the travel pump and the travel motor, the hydraulic circuit including
- a first circuit connecting the first pump port and the first motor port, and
- a second circuit connecting the second pump port and the second motor port;
- a pressure sensor configured to output a signal indicative of a hydraulic pressure in at least one of the first circuit and the second circuit, the pressure sensor including
- a first pressure sensor configured to output a signal indicative of the hydraulic pressure in the first circuit, and
- a second pressure sensor configured to output a signal indicative of the hydraulic pressure in the second circuit;
- an accelerator operating member;
- an accelerator operating sensor configured to output a signal indicative of an operating amount of the accelerator operating member;
- and
- a controller configured to receive signals from the pressure sensor and the accelerator operating sensor, the controller being configured to
- determine a compensation factor from the operating amount of the accelerator operating member and the hydraulic pressures in at least one of the first circuit and the second circuit,
- determine a target vehicle speed from the operating amount of the accelerator operating member,
- determine at least one of a target displacement of the travel pump and a target displacement of the travel motor from the target vehicle speed and the compensation factor,
- determine a target differential pressure between the first circuit and the second circuit from the operating amount of the accelerator operating member,
- acquire an actual differential pressure between the first circuit and the second circuit from the signal from the first pressure sensor and the signal from the second pressure sensor, and
- determine the compensation factor based on the target differential pressure and the actual differential pressure.
17 more elements
A work vehicle comprising:
- an engine;
- a hydrostatic transmission including
- a travel pump configured to be driven by the engine, the travel pump including a first pump port and a second pump port,
- a travel motor including a first motor port and a second motor port, and
- a hydraulic circuit connecting the travel pump and the travel motor, the hydraulic circuit including
- a first circuit connecting the first pump port and the first motor port, and
- a second circuit connecting the second pump port and the second motor port;
- a pressure sensor configured to output a signal indicative of a hydraulic pressure in at least one of the first circuit and the second circuit;
- an accelerator operating member;
- an accelerator operating sensor configured to output a signal indicative of an operating amount of the accelerator operating member;
- and
- a controller configured to receive signals from the pressure sensor and the accelerator operating sensor, the controller being configured to
- determine a compensation factor from the operating amount of the accelerator operating member and the hydraulic pressures in at least one of the first circuit and the second circuit,
- determine a target vehicle speed from the operating amount of the accelerator operating member,
- determine at least one of a target displacement of the travel pump and a target displacement of the travel motor from the target vehicle speed and the compensation factor,
- determine a primary target value of the displacement of the travel pump from the target vehicle speed, and
- determine the target displacement of the travel pump based on the primary target value and the compensation factor.
14 more elements
A work vehicle comprising:
- an engine;
- a hydrostatic transmission including
- a travel pump configured to be driven by the engine, the travel pump including a first pump port and a second pump port,
- a travel motor including a first motor port and a second motor port, and
- a hydraulic circuit connecting the travel pump and the travel motor, the hydraulic circuit including
- a first circuit connecting the first pump port and the first motor port, and
- a second circuit connecting the second pump port and the second motor port;
- a pressure sensor configured to output a signal indicative of a hydraulic pressure in at least one of the first circuit and the second circuit;
- an accelerator operating member;
- an accelerator operating sensor configured to output a signal indicative of an operating amount of the accelerator operating member;
- and
- a controller configured to receive signals from the pressure sensor and the accelerator operating sensor, the controller being configured to
- determine a compensation factor from the operating amount of the accelerator operating member and the hydraulic pressures in at least one of the first circuit and the second circuit,
- determine a target vehicle speed from the operating amount of the accelerator operating member,
- determine at least one of a target displacement of the travel pump and a target displacement of the travel motor from the target vehicle speed and the compensation factor,
- determine a primary target value of the displacement of the travel motor from the target vehicle speed, and
- determine the target displacement of the travel motor based on the primary target value and the compensation factor.
14 more elements
Dependencies are inferred from the claim text.