| 摘要 |
PROBLEM TO BE SOLVED: To improve both the running stability of a vehicle and the drivability by setting an optimum shift-up amount according to the size of the slip angle of a driving wheel. SOLUTION: This shift control device of an automatic transmission carries out a shift-up when the speed reduction slip ratio of a driving wheel is made larger excessively. The slip angleαr of the driving wheel is found (Step 30), the speed reduction slip ratio Sr of the driving wheel is inferred (Step 50), and it is decided whether the slip angle and the inferred speed reduction slip ratio are within a limit friction circle or not (Step 60). When the answer of the decision is YES, the speed change control is carried out by making the gear change step as an object gear change step (Step 130), and when the answer is NO, the above procedure is repeated as to the gear change step higher one step than the present change step, until the decision of YES is given. |
