| 摘要 |
PURPOSE:To correctly judge the existence of the revolution blow-up by comparing the input/output revolution speed ratio of an operating clutch for the fore stage in case of the power on up shift or for the rear stage in case of the power on down shift, with a threshold value slightly less than 1.0. CONSTITUTION:When, in a speed change mechanism 10, smooth speed change is performed free from the engine blow-up after an up-shift speed change is instructed in the power on shift up, the input/output revolution speed ratio of an operating clutch for the fore stage does not become less than 1.0, while in case of the power on shift down, the input/output revolution speed ratio of the operating clutch for the rear stage of speed change does not become less than 1.0. Therefore, a controller 30 receives the signals of the revolution sensor 32, 35, etc., and the existence of the engine blow-up is judged according to the fact if the input/output revolution speed ratio of the operating clutch for the fore stage in case of the power on up shift becomes less by a prescribed value in comparison with a threshold value slightly less than 1.0, in consideration of error, or the input/output revolution speed ratio of the operating clutch for the rear stage in case of the power on down shift is less by the prescribed value. Thus, correct judgement is permitted. |
