| 摘要 |
PURPOSE:To enable the control of the optimal condition at any time and improve the snow removing efficiency by setting the optimal control characteristic for respective combinations of travelling speed stage, and speed stage of a snow removing device and snow removing cross-sectional area, and performing control on the basis of them. CONSTITUTION:The optimal control characteristic for respective conditions corresponding to the combination of speed stage of a travelling transmission 3, speed stage of a transmission 7 for a snow removing device and snow removing cross-sectional area are set on the basis of theory and result of experiment. When the load of the snow removing device 9 is light and the engine speed N is larger than the reference speed N0, the HST swash plate angle theta is maintained at a constant value theta0 so as to prevent the higher speed than required. When the engine speed N is between the reference speed N0 and the engine speed NL unsuitable for snow removing work, the HST swash plate angle theta is reduced in proportion to the lowering amount of the engine speed N. Further, when the engine speed N is fallen below the engine speed NL, the HST swash plate angle theta is made 0. |
