Apparatus for controlling an internal combustion engine and method thereof
AssigneeUnisia Jecs Corporation
InventorsNaoki Tomisawa, Kenichi Machida
Life of this patent
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Abstract
A rate of change in the combustion pressure in each of the cylinders is calculated based upon a result detected by a combustion pressure sensor provided for each of the cylinders. The air-to-fuel ratio is increased and/or the ignition timing is retarded for each of the cylinders so that a rate of change in the combustion pressure approaches a value corresponding to the combustion stability limit in each of the cylinders.
Claims10
An apparatus for controlling an internal combustion engine comprising:
- an ignition plug provided for each cylinder of the engine;
- a combustion pressure sensor provided for each of the cylinders of the engine;
- a rate-of-change operation means for operating a rate of change in the combustion pressure in each of the cylinders based on the combustion pressure in each of the cylinders detected by said combustion pressure sensor;
- a correction value setting means for setting a correction value for correcting an ignition timing for said ignition plug for each of the cylinders so that the rate of change in the combustion pressure in each of the cylinders calculated by said rate-of-change operation means approaches a value corresponding to a combustion stability limit;
- and
- a correction means for separately correcting the ignition timings for said ignition plugs based upon the correction values for the cylinders set by said correction value setting means.
A method of controlling an internal combustion engine wherein a rate of change in the combustion pressure in each of the cylinders is calculated based upon the combustion pressure in each cylinder detected by a combustion pressure sensor provided for each of the cylinders of the engine, and ignition timings for the ignition plugs provided for each of the cylinders are separately corrected so that the rate of change in the combustion pressure in each of the cylinders approaches a value corresponding to a combustion stability limit.
An apparatus for controlling an internal combustion engine comprising:
- a fuel injection valve provided for each cylinder of the engine;
- a combustion pressure sensor provided for each of the cylinders of the engine;
- a rate-of-change operation means for operating a rate of change in the combustion pressure in each of the cylinders based on the combustion pressure in each of the cylinders detected by said combustion pressure sensor;
- a correction value setting means for setting a correction value for correcting a fuel injection amount through said fuel injection valve for each of the cylinders so that the rate of change in the combustion pressure in each of the cylinders calculated by said rate-of-change operation means approaches a value corresponding to a combustion stability limit;
- and
- a correction means for separately correcting the fuel injection amounts through said fuel injection valves based upon the correction values for the cylinders set by said correction value setting means.
A method of controlling an internal combustion engine wherein a rate of change in the combustion pressure in each cylinder is calculated based upon the combustion pressure in each of the cylinders detected by a combustion pressure sensor provided for each of the cylinders of the engine, and fuel injection amounts through fuel injection valve provided for the cylinders are separately corrected so that the rate of change in the combustion pressure in each of the cylinders approaches a value corresponding to a combustion stability limit.
Dependencies are inferred from the claim text.