Abstract: A bulldozer includes a blade pivotably attached to a vehicle body, a blade operation lever, and a blade control section. The blade operation lever outputs a lowering instruction signal, a holding instruction signal, and a raising instruction signal for the blade. The blade control section controls a height of the blade according the signal input. The blade control section can lower the blade to a predetermined position when the lowering instruction signal and the holding instruction signal are input in order after a transmission has been switched from a state, which is different from an advancing state, to the advancing state. The blade control section can raise the blade to a predetermined position when the raising instruction signal and the holding instruction signal are input in order after a transmission has been switched from a state, which is different from a reversing state, to the reversing state.

Abstract: A bulldozer includes a blade pivotably attached to a vehicle body, a blade operation lever, and a blade control section. The blade operation lever outputs a lowering instruction signal, a holding instruction signal, and a raising instruction signal for the blade. The blade control section controls a height of the blade according the signal input. The blade control section can lower the blade to a predetermined position when the lowering instruction signal and the holding instruction signal are input in order after a transmission has been switched from a state, which is different from an advancing state, to the advancing state. The blade control section can raise the blade to a predetermined position when the raising instruction signal and the holding instruction signal are input in order after a transmission has been switched from a state, which is different from a reversing state, to the reversing state.

Abstract: An upper limit speed control part controls the lower limit of motor displacement in conformance with the target upper limit speed via a motor displacement control part when the target upper limit speed is within the normal speed range. The upper limit speed control part controls the upper limit of pilot pressure via a pilot pressure control part in conformance with the target upper limit speed when the target upper limit speed is within the low speed range. Further, when the target upper limit speed is within the low speed range, the upper limit speed control part controls a pilot pressure valve such that the upper limit of pilot pressure increases as drive circuit pressure increases.

Abstract: An upper limit speed control part controls the lower limit of motor displacement in conformance with the target upper limit speed via a motor displacement control part when the target upper limit speed is within the normal speed range. The upper limit speed control part controls the upper limit of pilot pressure via a pilot pressure control part in conformance with the target upper limit speed when the target upper limit speed is within the low speed range. Further, when the target upper limit speed is within the low speed range, the upper limit speed control part controls a pilot pressure valve such that the upper limit of pilot pressure increases as drive circuit pressure increases.

Abstract: A traveling control device and a traveling control program for a work vehicle in which a change in a control quantity due to an effect of vehicle body vibrations is small, fixing the desired control quantity is possible, and the control quantity can be matched with the operator's feel. A travel control program in which a first line on which the speed ratio reduces corresponding to a change in the operation stroke, a second line having hysteresis with respect to the first line and on which the speed ratio increases corresponding to a change in the operation stroke, and third lines 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 and the second line are set is installed in the control device.

Abstract: A vehicle mounted with a continuous stepless transmission having a continuous stepless transmission and a controlling section for performing speed-changing operation of the continuous stepless transmission, the speed change ratio of the continuous stepless transmission being switchable by a speed change operation section, includes: a shift-mode-switching section which switches the mode of a speed change ratio switching, the speed change ratio switching being performed by the speed change operation section, between a first mode for switching the speed change ratio in stages among a plurality of preset speed change ratios and a second mode for switching the speed change ratio continuously or substantially continuously; in which the controlling section further includes a vehicle speed setting section which sets a target vehicle speed at least based on the speed change operation signal detected by operating the speed change operation section and a mode signal detected by switching the shift-mode-switching section

Abstract: 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 L1 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.

Abstract: A vehicle mounted with a continuous stepless transmission having a continuous stepless transmission and a controlling section for performing speed-changing operation of the continuous stepless transmission, the speed change ratio of the continuous stepless transmission being switchable by a speed change operation section, includes: a shift-mode-switching section which switches the mode of a speed change ratio switching, the speed change ratio switching being performed by the speed change operation section, between a first mode for switching the speed change ratio in stages among a plurality of preset speed change ratios and a second mode for switching the speed change ratio continuously or substantially continuously; in which the controlling section further includes a vehicle speed setting section which sets a target vehicle speed at least based on the speed change operation signal detected by operating the speed change operation section and a mode signal detected by switching the shift-mode-switching section