| 摘要 |
A totally closed value of the throttle valve of an engine having a fast idle function will be rendered capable of being correctly detected. The throttle valve can be opened and closed by the motor during a fast idle operation. The opening indicated value IACV to be supplied to the motor is a value obtained by adding the water temperature correction value and the atmospheric pressure correction value to the totally closed reference value. A value obtained by subtracting the water temperature correction value and the atmospheric pressure correction value from the actual opening to be detected by the throttle sensor is set to the totally closed value. At the totally closed value, there is provided a dead zone. When the value obtained by subtracting the water temperature correction value and the atmospheric pressure correction value from the actual opening goes out of the dead zone, the totally closed value is replaced with the value obtained by subtracting both correction values from the actual opening. When the value obtained by subtracting both correction values from the actual opening continues during a predetermined duration to go out of the dead zone, it is advisable to renew the totally closed value.
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