| 摘要 |
PCT No. PCT/JP96/01593 Sec. 371 Date Feb. 11, 1997 Sec. 102(e) Date Feb. 11, 1997 PCT Filed Jun. 12, 1996 PCT Pub. No. WO96/41978 PCT Pub. Date Dec. 27, 1996A shift control method for an automotive automatic transmission is provided, which reduces a shift shock particularly at the time of a skip down-shift, and shortens a required shifting time period. An electronic control unit of a shift control apparatus releases the engagement of a clutch of a subsidiary transmission mechanism and engages a one-way clutch so as to establish a gear position not used in the normal speed change when a shift command from the fifth shift position to the third shift position is issued, gradually decreasing a valve opening duty ratio of an electromagnetic valve associated with a brake of a main transmission mechanism from an initial value DHLi before this gear position is established, determines an average turbine rotation speed changing rate dDTAVE/dt from the detected turbine rotation speed (S203), and learning correction of the initial value DHLi is made if the changing rate deviates from a target range (S204-S208). |
