| 摘要 |
PURPOSE: A method for deciding feedback down-shift synchronization of an automatic transmission is provided to prevent a rapid pressurization right after synchronization by maintaining a target turbine change ratio until a turbine change ratio is decreased properly. CONSTITUTION: Synchronization is started, and a parameter of a target turbine change ratio is determined(S130-S150). The parameter of a first target turbine change ratio is set up as a target turbine change ratio, and a kick-down shift feedback control duty is outputted(S160,S170). If a detected turbine rpm reaches a first target turbine rpm and a second target turbine rpm, a present turbine change ratio is compared to the target turbine change ratio(S180). If the present turbine change ratio is over the target turbine change ratio, the target turbine change ratio is set up as zero and the kick-down shift feedback control duty is outputted continuously until a predetermined time is elapsed(S190).
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