| 摘要 |
PURPOSE:To reduce production cost by estimating a bypass air flow rate by detecting an energizing current in an electromagnetic coil of an auxiliary air valve for controlling the bypass air flow rate of the air that bypasses a throttle valve. CONSTITUTION:Calculating a fuel injection rate with an operation means D based on an engine rpm and an intake air amount estimated with an estimating means C from outputs of detecting means A and B respectively for detecting a throttle valve opening and an engine rpm, a fuel injection valve F is controlled through an output means E. An auxiliary air valve H of electromagnetic type in a bypass passage bypassing the throttle valve is controlled with a control means G which issues a duty signal in proportion to a deviation of an idling rpm relative to a target value. At this time, it is made such that an energizing current to the auxiliary air valve H is detected with a detecting means I, a bypass air now rate is estimated with an estimating means J based on the detected output, and the estimated suction air flow rate is compensated with a compensation means K according to the estimated value.
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