Hydrostatic transmission for work vehicle and control method thereof
AssigneeLs Mtron Ltd.
InventorsSeungho CHEONG, Ok Shik SHIN
Life of this patent
Estimating the term…
Abstract
The present disclosure is directed to a hydrostatic transmission for a work vehicle and a method of controlling the same. The hydrostatic transmission for a work vehicle according to the present disclosure is rotatably provided with a swash plate in a hydraulic motor, and the angle of the swash plate is adjusted by a servo-mechanism in response to a current load state. According to the present disclosure, gear shift shocks and engine stalls may be minimized.
Claims15
A hydrostatic transmission for a work vehicle, the hydrostatic transmission comprising:
- a hydraulic motor configured to generate rotational force of an output shaft by hydraulic pressure, and to allow a rotational speed of the output shaft to be varied depending on an angular position of a first swash plate whose angular position is variable;
- a first servo-mechanism configured to vary the angular position of the first swash plate in the hydraulic motor between minimum and maximum angles while being controlled by a controller,
- a hydraulic pump configured to provide hydraulic pressure to the hydraulic motor, and to vary flow rate, provided to the hydraulic motor, depending on an angular position of a second swash plate whose angular position is variable;
- and
- a second servo-mechanism configured to vary the angular position of the second swash plate in the hydraulic pump while being controlled by the controller,
- wherein the minimum angle is an angular position at which the rotational speed of the output shaft is minimized, and the maximum angle is an angular position at which the rotational speed of the output shaft is maximized;
- and
- wherein the controller controls the first servo-mechanism to vary the angular position of the first swash plate between the minimum and maximum angles in response to a load state of an engine.
A method of controlling a hydrostatic transmission for a work vehicle, the method comprising:
- an information collection step of collecting information used to identify a load state of an engine;
- a load determination step of identifying the load state of the engine by analyzing the information collected in the information collection step, and then determining the load state of the engine;
- and
- an angular position adjustment step of varying an angular position of a swash plate in a hydraulic motor in a control mode based on the load state of the engine determined in the load determination step.
Dependencies are inferred from the claim text.