| 摘要 |
<p>PURPOSE:To prevent generation of hunting by determining an initial set value of feedback control for engaging pressure based on a specific operational formula, and learning and correcting the set value. CONSTITUTION:In a variable speed control device of an automatic transmission for feedback-controlling engaging pressure of a frictional engaging device at the time of speed change, an initial set Dsn of feedback control for engaging pressure is learned and corrected based on formula I (Dsn-1 is an initial set value of feedback control for the same variable speed as the last time, Dmaxn-1 is the maximum value of correction values of engaging pressure similarly, Dminn-1 is the minimum value of correction values of engaging pressure similarly respectively and k is a. constant). Optimum initial set value Dsn can thus be constantly obtained without causing hunting.</p> |
