| 摘要 |
PROBLEM TO BE SOLVED: To suitably maintain an air-fuel ratio and to obtain suitable driving power even when driving by only fuel injection from outside cylinder injector at the time of fail-safe caused by a breakdown of an injector system within a cylinder. SOLUTION: When a cylinder injector system breaks down, fuel injection from a cylinder injector 10 is prohibited and only an outside cylinder injector 11 is allowed to inject the fuel. A target inlet air amount correcting means 36 calculates the target inlet air amount on the basis of a fuel injection amount from the outside cylinder injector 11 and a theory air-fuel ratio, and a throttle passing air amount calculating means 37 calculates the amount of air passing through a throttle by a reverse chamber model equation on the basis of the target inlet air amount. A throttle opening indication value calculating means 38 calculates a throttle opening indication value corresponding to the amount of air passing through a throttle, and outputs the throttle opening indication value to a throttle actuator 5a through a throttle valve driving portion 39 to control the opening of the throttle valve. Since the opening of the throttle valve is controlled by a value corresponding to the theory air-fuel ratio, the air-fuel ratio is suitably maintained.
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