| 摘要 |
PURPOSE: A control method of shifting from N-range to D-range for an automatic transmission of a vehicle is provided to improve shift quality and responsiveness by controlling the feedback duty from starting shifting to finishing synchronized shifting during traveling at high speed. CONSTITUTION: A transmission control unit controls shifting by receiving information from a travel state detecting unit for traveling at high speed(S100), and detects shifting from D-range to N-range(S110). An open loop duty control signal is output to a driving unit in shifting from D-range to N-range(S120). The transmission control unit detects satisfaction of the first condition, and compares turbine RPM(Revolution Per Minute) with target turbine RPM(S130,S140). The open loop duty control is finished, and the feedback duty control signal is output to the driving unit(S150,S160). The duty is controlled by the transmission control unit in finishing synchronized shifting(S170). Shift quality is improved with feedback duty controlling open-loop shifting till finishing synchronized shifting.
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