| 摘要 |
PURPOSE:To improve control accuracy of air-fuel ratio, by storing in memory a reference correction value in that time as a separate data from the ordinary data and calculating a control output value of air-fuel ratio being based on said separate data, in the case of an engine performing an idle-up control when an electric load is operated. CONSTITUTION:A throttle valve 3, which can be opened and closed by an accelerator pedal, is able to be opened and closed even with a throttle opener 17, and it is driven by a negative pressure via a threeway solenoid valve 18 controlled by a control circuit 20. Here in the control circuit 20, when an engine is in normal operation, a reference correction value for correcting an error of an air-fuel ratio control reference value, obtained in accordance with the operative condition, is stored in memory as the first data. While the control circuit controls the three way type solenoid valve 18 in a direction of increasing the opening of the throttle valve 3, when an electric load of air conditioner or the like is operated in the time of idle operation, while stores in memory the reference correction value, calculated in that time, as the second data, and a control output value of air-fuel ratio is calculated by reading the reference correction value from said second data.
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