| 摘要 |
PURPOSE: A shift control apparatus of an automatic transmission for a vehicle and a method thereof are provided to prevent shift shock by restricting run-up at the initial stage in power-on upshifting and controlling run-up with back duty control. CONSTITUTION: A transmission control unit performs shift control based on the predetermined program by receiving signals from a travel state detector(S100), and detects a power-on upshift control signal in stepping on an accelerator(S110). A duty control signal of 0% is output to release control pressure in detecting power-on upshift(S120). The duty control signal is output with increasing(S140), and kept for the predetermined time(S150). The transmission control unit detects run-up by comparing after keeping the control signal during the predetermined time(S160). The feedback control is performed in detecting run-up(S170), and release of run-up is detected during feedback control(S180). The transmission control unit returns to the main routine in releasing run-up, and detects turbine rpm in not releasing run-up(S190,S200). The duty control signal is output by decreasing in case of the turbine rpm to be at the desired turbine rpm, and run-up is detected(S210). Shift shock is prevented with restricting run-up in power-on upshifting.
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