| 摘要 |
PURPOSE: A gearshift control method executes reconfirmation to prevent miss-gearshift even when a temporary wrong signal is inputted by a driver's miss-operation of a gearshift lever. CONSTITUTION: A control method comprises four steps. The first step(S110) is to receive and read throttle valve opening amount, output shaft rotation frequency, acceleration pedal switch, oil temperature, engine rotation frequency and turbine rotation frequency detected in a vehicle driving on D range 4th speed to compare and determine whether a gearshift lever is switched from D range to 2 or L range. The second step(S120) is to compare and determine whether the engine rotation frequency is under the 3→2 gearshift allowing rotation frequency if the gearshift lever is switched from D range to 2 or L range. The third step(S130) is to compare and determine whether the objective gearshift speed is 2nd speed and the last car speed(No(n-1)) is higher than the current car speed(No) if the engine rotation frequency is under the 3→2 gearshift allowing rotation frequency. The forth step(S140) is to output 2nd speed gearshift control signal if the objective gearshift speed is 2nd speed and the condition that the last car speed(No(n-1)) is higher than the current car speed(No) is not satisfied.
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