| 摘要 |
PROBLEM TO BE SOLVED: To provide an automatic transmission which provides optimal shift down timing with considering deceleration and engine rotation speed. SOLUTION: This transmission is provided with: a means detecting deceleration; a means detecting engine rotation speed; a means storing peak Ne which is a peak value of engine rotation speed during period of travel with one predetermined gear position; a map for defining sift downΔNe from the deceleration; and a means executing shift down when engine rotation speed drops from the peak Ne by shift downΔNe. Since the shift downΔNe is set at a smaller value as the deceleration is larger, shift down is executed at higher rotation speed as deceleration is larger. A timer inhibiting shift down for a predetermined period of time is operated when the engine rotation speed drops from the peak Ne by shift downΔNe. Consequently, excessive speed change shock due to continuous shift down is prevented. COPYRIGHT: (C)2007,JPO&INPIT |
