Work machine and control method
AssigneeKomatsu Ltd.
InventorsAkira NAKASHIMA, Shinobu KAMIKAWA
Life of this patent
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Abstract
An HST circuit has a hydraulic pump that converts a drive force of an engine into energy of oil, and a hydraulic motor that converts the energy of the oil converted by the hydraulic pump into drive energy. Pressure sensors detect a pressure of the oil within the HST circuit. A variable charge pump replenishes the oil into the HST circuit. A controller controls a capacity of the variable charge pump based on the pressure of the oil within the HST circuit detected by the pressure sensors.
Claims19
A work machine comprising:
- a motive power source;
- a closed circuit having a pump that converts a drive force of the motive power source into energy of a fluid and a motor that converts the energy of the fluid converted by the pump into drive energy;
- a pressure sensor that detects a pressure of the fluid within the closed circuit;
- a variable charge pump that replenishes the fluid into the closed circuit;
- and
- a controller that controls a capacity of the variable charge pump based on the pressure of the fluid within the closed circuit detected by the pressure sensor.
A control method for a work machine, the work machine having a motive power source, and a closed circuit having a pump that converts a drive force of the motive power source into energy of a fluid and a motor that converts the energy of the fluid converted by the pump into drive energy, the control method comprising:
- detecting a pressure of the fluid within the closed circuit;
- and
- controlling a capacity of a variable charge pump that replenishes the fluid into the closed circuit, based on the detected pressure of the fluid within the closed circuit.
Dependencies are inferred from the claim text.