| 摘要 |
PROBLEM TO BE SOLVED: To provide a slip control device of a lock up clutch for a vehicle whereby fluctuation of a turbine rotational speed caused by a bad road in a prescribed gear shift can be decided even in the vehicle without providing an output shaft rotation sensor in an automatic transmission. SOLUTION: In the case of estimating rotational speed fluctuation of a input shaft of an automatic transmission 14 by a rotational speed fluctuation estimating means 226, automatic transmission 14 is switched to a speed shift stage except a 4th speed gear stage by a rotational fluctuation estimation time speed shift stage switch means 228, when a lock up clutch 32 is released by a rotational fluctuation estimation time lock up clutch release means 230, by a decision means 232, based on rotational speed fluctuation of a clutch drum in the automatic transmission 14 detected by a Co clutch rotational speed sensor 178, a bad road or shudder of the lock up clutch 32 is decided. |
