Method and apparatus for detecting combustion variations in internal combustion engine
First Claim
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1. A method for detecting combustion variations in an internal combustion engine, comprising the steps of:
- detecting at least two engine rotational speeds at predetermined timings for every firing stroke in one cylinder of said engine;
calculating the square of each of the detected engine rotational speeds;
calculating an engine speed variation between two of the squared engine rotational speeds for every firing stroke in one cylinder of said engine; and
performing a process upon the sequence of the calculated engine speed variations, thereby determining an engine combustion state by the processed result.
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Abstract
In an internal combustion engine, a plurality of engine rotational speeds are detected at predetermined timings for every firing stroke in one cylinder of the engine, and an engine speed variation is calculated as a variation between the square of one of the engine rotational speed and the square of another of the engine rotational speed. A process is performed upon the sequence of the engine speed variations, thus determining an engine combustion state by the processed result.
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8 Claims
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1. A method for detecting combustion variations in an internal combustion engine, comprising the steps of:
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detecting at least two engine rotational speeds at predetermined timings for every firing stroke in one cylinder of said engine; calculating the square of each of the detected engine rotational speeds; calculating an engine speed variation between two of the squared engine rotational speeds for every firing stroke in one cylinder of said engine; and performing a process upon the sequence of the calculated engine speed variations, thereby determining an engine combustion state by the processed result. - View Dependent Claims (2, 3, 4)
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5. An apparatus for detecting combustion variations in an internal combustion engine, comprising:
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means for detecting at least two engine rotational speeds at predetermined timings for every firing stroke in one cylinder of said engine; means for calculating the square of each of the detected engine rotational speeds; means for calculating an engine speed variation between two of the squared engine rotational speeds for every firing stroke in one cylinder of said engine; and means for performing a process upon the sequence of the calculated engine speed variations, thereby determining an engine combustion state by the processed result. - View Dependent Claims (6, 7, 8)
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Specification