| 摘要 |
PURPOSE:To previously prevent up-shifting operation accompanied by abrupt increase of slipping of driving wheels by controlling such that up-shifting of a transmission lever is prevented when the present rotational speed of an output shaft of a transmission device is larger than the maximum rotational speed thereof. CONSTITUTION:Detection signals are input to an electronic control unit(ECU) 63 from a foreward/back changeover lever switch 64, an engine speed sensor 65, a vehicle speed sensor 67, a shift position sensor 68, an accelerator opening sensor 70, a transmission mode changeover switch 71, an inching opening sensor 90, and the like. Required control signals based on the respective detection signals are output to a hydraulic control device 60, for controlling supply/ discharge of pressure oil in respect to a clutch or a brake of a transmission device. The ECU 63 prevents a transmission lever 62 from up-shifting when the present rotational speed of an output shaft of the transmission device detected by the vehicle speed sensor 67 is larger than the maximum rotational speed thereof. Repetition of unnatural transmission operation is prevented, accordingly. |
