| 摘要 |
PROBLEM TO BE SOLVED: To provide an abnormality determination device that can suppress a decline in determination accuracy of an abnormality determination caused by fuel replenishment.SOLUTION: An internal combustion engine to which this device is applied is a multi-cylinder internal combustion engine that includes a passage injection valve and a cylinder injection valve and can use gasoline and alcohol as fuel. The device makes an abnormality determination of determination target equipment on the basis of a detection signal obtained by an oxygen sensor provided in an exhaust passage of the internal combustion engine. An alcohol concentration ALp of fuel in a first fuel passage for supplying fuel to the passage injection valve and an alcohol concentration ALd of fuel in a second fuel passage for supplying fuel to the cylinder injection valve are detected by a concentration sensor. When a difference ΔAL between the alcohol concentrations ALp, ALd is a predetermined value or higher (Yes in S13), the execution of the abnormality determination is prohibited (S12).SELECTED DRAWING: Figure 4 |
