Emission deterioration informing device

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 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 set the threshold value at a larger value in the case where the operation state is not determined to be the impact state than in the case where the operation state is determined to be the impact state.

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 time number sensing means for sensing an actual injection time number of split injections when the fuel injection in a combustion cycle of the internal combustion engine is performed as a plurality of split injections;
• an emission deterioration informing means for informing deterioration of exhaust emission when the sensed actual injection time number is smaller than a target injection time number;
• 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 because the actual injection time number is smaller than the target injection time number, 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.