| 摘要 |
PROBLEM TO BE SOLVED: To obviate manual shift operation by shifting a speed by respectively outputting a command for setting oil pressure of a pre-shift clutch to zero at shift starting time when shifting to a low speed stage and a command for raising oil pressure of a post-shift clutch when an absolute value of an input shaft conversion relative speed is smaller than a prescribed small speed threshold value. SOLUTION: When a start of a shift is decided, oil pressure of a pre-shift clutch is set to zero, and the whole clutches are put in an unengaged state. When entering a climbing road in a state of treading an accelerator pedal 20, an output engine speed of an engine 11, that is, an input shaft rotating speed No of a transmission 12 increases, and when an input shaft conversion relative speed changes to a positive from a negative, that is, when a relative rotating speed of the clutch enters within a prescribed small speed threshold value close to zero, post-shift clutch oil pressure corresponding to a post-shift speed stage is raised. Thus, since the clutch engages when a relative rotating speed of the clutch is small, a shift shock can be minimized without being influenced by an engine brake.
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