Patent ID: 8229647

Claim:
A control apparatus for a multi-cylinder internal combustion engine equipped with fuel injection valves provided respectively for the cylinders comprising: a revolution measuring means for measuring a revolution speed for a predetermined angle for each-cylinder; an inter-cylinder revolution-difference calculating means for calculating, from the measured revolution speed, a difference in revolution speed between a cylinder of current explosion and a cylinder of the previous explosion; an injection amount correcting means for adjusting the average amount of injection of the fuel injection valves of all the cylinders in accordance with the inter-cylinder differences in revolution speed after the cold start of the engine calculated by the inter-cylinder revolution-difference calculating means; an inter-cylinder revolution-difference averaging means for averaging the differences in revolution speed; calculated by the inter-cylinder revolution-difference calculating means, each between the cylinder of current explosion and the cylinder of the previous explosion; an inter-cylinder ignition-timing correcting means for adjusting the ignition timing of each cylinder so that the average value of the inter-cylinder revolution differences calculated by the inter-cylinder revolution-difference averaging means can be reduced close to zero from the start of the engine until the average air-fuel ratio of all the cylinders becomes leaner than an air-fuel ratio for the maximum torque generation; and an inter-cylinder injection amount correcting means for adjusting the amount of injection of the fuel injection valve of each cylinder so that the average value of the inter-cylinder revolution differences calculated by the inter-cylinder revolution-difference averaging means can be reduced close to zero once the average air-fuel ratio of all the cylinders has become leaner than the air-fuel ratio for the maximum torque generation after the start of the engine.