| 摘要 |
PROBLEM TO BE SOLVED: To restrict deviation of an air-fuel ratio from a target air-fuel ratio in acceleration or deceleration, in an internal combustion engine comprising an injection valve for injecting fuel into an intake passage and a mechanism for changing the compression ratio. SOLUTION: In the case wherein a determination that the operating speed is in the state of acceleration (deceleration) is done, this control device corrects a basic fuel injection quantity Fbase for obtaining a target air-fuel ratio abyfr to a correction coefficient KF by increasing (decreasing) in response to a degree of change in the quantity of adhered fuel in an intake passage structuring member in acceleration/deceleration. The correction coefficient KF is set at a value obtained by correcting a standard correction coefficient FbaseA(KFbaseD) corresponding to a standard compression ratio so that a degree of correction is reduced as the compression ratioεis larger than the standard compression ratio. As the compression ratioεis larger than the standard compression ratio, a real degree of change in the quantity of adhered fuel becomes smaller than a degree corresponding to the standard compression ratio. Consequently, the correction coefficient KF becomes a value corresponding to the real degree of change in the quantity of adhered fuel corresponding to the compression ratioε, and excessive correction of the basic fuel injection quantity Fbase can be restricted. COPYRIGHT: (C)2009,JPO&INPIT
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