Travel control unit of working vehicle

摘要

A travel control unit of a working vehicle includes an HST which is a hydraulic continuously variable transmission having a hydraulic pump and a hydraulic motor, a pedal sensor which is an operator sensor which detects a position of an acceleration pedal which is an acceleration operator, and a controller which changes a displacement of the hydraulic pump based on the position of the acceleration pedal. The controller increases the displacement of the hydraulic motor as the displacement of the hydraulic pump is reduced due to a displacement of the acceleration pedal to a low-velocity side.

主权项

1. A travel control unit of a working vehicle, comprising:
a hydraulic continuously variable transmission which is interposed between an engine and a wheel, which includes a hydraulic pump driven by the engine and a hydraulic motor fluidly connected to the hydraulic pump, and wherein the hydraulic pump and the hydraulic motor are respectively of a continuous displacement variable type in which a displacement continuously varies; a pedal sensor which detects a position of an acceleration pedal; and a controller which changes the displacement of the hydraulic pump according to the position of the acceleration pedal during deceleration of the working vehicle, wherein the controller increases the displacement of the hydraulic motor as the displacement of the hydraulic pump is reduced due to a displacement of the acceleration pedal to a low-velocity side during deceleration of the working vehicle, and, when starting reduction of the displacement of the hydraulic pump, starts increase of the displacement of the hydraulic motor.