| 摘要 |
PURPOSE: A shift control method of an automatic transmission is provided to increase fuel efficiency, and to reduce exhaust gas by varying the opening degree of a throttle valve and speed ranges according to the road condition during traveling. CONSTITUTION: The speed of a vehicle is input to an autocruise setting unit, and compared with the predetermined value by detecting RPM(Revolution Per Minute) of an output shaft corresponding to vehicle speed(S100,S110). Difference between the predetermined vehicle speed and the present speed is calculated(S120), and the opening degree of the throttle valve is set according to errors by the control unit(S130). The control unit estimates fuel efficiency and displacement by calculating with detecting the throttle valve opening degree, the present speed range and the engine RPM(S140). The control unit compares the calculated value with the estimated value of fuel efficiency and displacement by calculating the throttle valve opening degree after shifting(S160). The control unit outputs the control signal to the driving unit, a shift driving unit and a throttle actuator(S170). Fuel efficiency and displacement are optimized with selecting the traveling state by detecting the throttle valve opening degree.
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