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.
Claims17
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, wherein the controller controls the capacity of the variable charge pump to be set to a first capacity when the pressure of the fluid detected by the pressure sensor is a first pressure, and controls the capacity of the variable charge pump to be set to a second capacity smaller than the first capacity when the pressure of the fluid detected by the pressure sensor is a second pressure smaller than the first pressure.
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, wherein, in controlling the capacity of the variable charge pump, the capacity of the variable charge pump is controlled to be set to a first capacity when the detected pressure of the fluid is a first pressure, and the capacity of the variable charge pump is controlled to be set to a second capacity smaller than the first capacity when the detected pressure of the fluid is a second pressure smaller than the first pressure.
Dependencies are inferred from the claim text.