Patent ID: 8788179

Claim:
An emission deterioration informing device applied to a direct injection internal combustion engine, which injects fuel from an injector directly into a combustion chamber and which is a spark ignition internal combustion engine, the emission deterioration informing device comprising: an actual injection timing sensing means for sensing actual injection timing, at which the fuel injection is actually performed from the injector; a deviation amount calculating means for calculating a deviation amount of the sensed actual injection timing from target injection timing; an emission deterioration informing means for informing deterioration of exhaust emission when the calculated deviation amount is larger than a predetermined threshold value; and an impact state determining means for determining whether an operation state of the internal combustion engine is an impact state, in which the exhaust emission receives a predetermined influence or more from the deviation of the actual injection timing from the target injection timing, wherein the emission deterioration informing device is configured to allow the information by the emission deterioration informing means when the operation state is determined to be the impact state, and the emission deterioration informing device is configured to prohibit the information by the emission deterioration informing means when the operation state is not determined to be the impact state.