Controller for internal combustion engine

A controller for an internal combustion engine, comprising:

• engine speed fluctuation detecting means for detecting fluctuations in revolution speed of an internal combustion engine;
• final correcting means for correcting a predetermined parameter used for controlling the internal combustion engine on the basis of a final correction value;
• and
• control means for controlling the internal combustion engine on the basis of the predetermined parameter corrected by the final correcting means,
• wherein correction value setting means for setting a correction value for correcting the predetermined parameter on the basis of an engine speed fluctuation detected by the engine speed fluctuation detecting means is provided, and
• the final correcting means selects either a correction value set by the correction value setting means or a final correction value of last time set by the final correcting means, which suppresses the engine speed fluctuation more, and sets a final correction value.

A controller for an internal combustion engine, comprising:

• control means using a parameter which exerts an influence on a revolution speed fluctuation amount of an internal combustion engine;
• basic fuel injection amount setting means for setting a basic fuel injection amount for carrying out combustion at a relatively lean air-fuel ratio;
• engine speed fluctuation amount detecting means for detecting a revolution speed fluctuation amount of the internal combustion engine;
• and
• roughness correcting means for correcting the basic fuel injection amount which is set by the basic fuel injection amount setting means on the basis of the revolution speed fluctuation amount of the internal combustion engine detected by the engine speed fluctuation amount detecting means,
• wherein correcting means for correcting a correction amount in the roughness correcting means on the basis of the value of the parameter is provided.