| 摘要 |
Even when an operation device with a short operation stroke range is adopted, so that a change in a control quantity (speed ratio) due to an effect of vehicle body vibrations or similar is small and it is possible to fix the desired control quantity (speed ratio), and moreover the control quantity (speed ratio) can be obtained in accordance with the operator's feel when carrying out fine adjustments by increasing and decreasing an operation stroke. A controller 20 calculates the speed ratio in accordance with a relationship L 1 shown in FIG. 3 , and controls the speed ratio. A travel control program in which the following are set and that carries out the calculation is installed in the controller 20 . 1) A first line L 11 on which the speed ratio reduces corresponding to a change in the operation stroke, a second line L 12 that has hysteresis with respect to the first line L 11 and on which the speed ratio increases corresponding to a change in the operation stroke, and third lines L 131 , L 132 , L 133 , L 134 on which the speed ratio changes corresponding to the change in the operation stroke and the change in speed ratio with respect to the change in the operation stroke is smaller than that of the first line L 11 and that of the second line L 12 are set, 2) when the operation device 21 is operated from a point on the first line L 11 in a direction that the speed ratio decreases, the speed ratio is calculated in accordance with the first line L 11 , 3) when the operation device 21 is operated from a point on the second line L 12 in a direction that the speed ratio increases, the speed ratio is calculated in accordance with the second line L 12 , and 4) when the operation device 21 is operated from a point on the first line L 11 in a direction that the speed ratio increases, or when the operation device 21 is operated from a point on the second line L 12 in a direction that the speed ratio decreases, the speed ratio is calculated in accordance with the third lines L 131 , L 132 , L 133 , L 134.
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