| 摘要 |
PROBLEM TO BE SOLVED: To continue operation as much as possible while protecting an internal combustion engine when a fuel injection valve fails in the internal combustion engine including a plurality of fuel injection valves per cylinder in an intake air passage. SOLUTION: A failure pattern is specified by detecting a relation of total of injection pulse width and actual injection total quantity of a cylinder in which air-fuel-ratio abnormality occurs. Then, assuming that one fuel injection valve is normal, an injection pulse width is corrected to return the actual injection total quantity to normal quantity. If air fuel ratio returns in a normal range as a result of the correction, it is decided that the assumption is correct and the failed fuel injection valve is specified. When the failure pattern and the failed fuel injection valve are specified, correction of injection pulse width and correction of fuel supply pressure are applied only to the failed fuel injection valve or to both fuel injection valves. If air fuel ratio is not returned in the normal range through the correction control, a fuel pump is stopped. COPYRIGHT: (C)2011,JPO&INPIT
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