Misfire detecting apparatus for internal combustion engine
First Claim
1. A misfire detecting apparatus for an internal combustion engine having rotational speed parameter detecting means for detecting a rotational speed parameter according to a rotational speed of said engine, and detecting a misfire of said engine based on the detected rotational speed parameter, said misfire detecting apparatus comprising:
- reference value calculating means for calculating a reference value of the rotational speed parameter;
relative speed parameter calculating means for calculating a difference between the reference value and the rotational speed parameter detected at every predetermined crank angle as a relative speed parameter; and
determining means for calculating an integrated value of the relative speed parameter, and performing a misfire determination based on the calculated integrated value, said determining means integrates the relative speed parameter for a period corresponding to 720/N degrees of a crank angle, where “
N”
is a number of cylinders of said engine.
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Abstract
A misfire detecting apparatus for an internal combustion engine wherein a rotational speed parameter according to a rotational speed of the engine is detected. A reference value of the rotational speed parameter is then calculated. Next, a difference between the reference value and a rotational speed parameter detected at every predetermined crank angle as a relative speed parameter is calculated. Further, an integrated value of the relative speed parameter is calculated, and a misfire determination is performed based on the calculated integrated value.
33 Citations
21 Claims
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1. A misfire detecting apparatus for an internal combustion engine having rotational speed parameter detecting means for detecting a rotational speed parameter according to a rotational speed of said engine, and detecting a misfire of said engine based on the detected rotational speed parameter, said misfire detecting apparatus comprising:
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reference value calculating means for calculating a reference value of the rotational speed parameter; relative speed parameter calculating means for calculating a difference between the reference value and the rotational speed parameter detected at every predetermined crank angle as a relative speed parameter; and determining means for calculating an integrated value of the relative speed parameter, and performing a misfire determination based on the calculated integrated value, said determining means integrates the relative speed parameter for a period corresponding to 720/N degrees of a crank angle, where “
N”
is a number of cylinders of said engine. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A misfire detecting method for an internal combustion engine, comprising the steps of:
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a) detecting a rotational speed parameter according to a rotational speed of said engine; b) calculating a reference value of the rotational speed parameter; c) calculating a difference between the reference value and the rotational speed parameter detected at every predetermined crank angle as a relative speed parameter; d) calculating an integrated value of the relative speed parameter, wherein the relative speed parameter is integrated for a period corresponding to 720/N degrees of a crank angle, where “
N”
is a number of cylinders of said engine; ande) performing a misfire determination based on the calculated integrated value. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A computer program embodied on a computer-readable medium, for causing a computer to implement a misfire detecting method for an internal combustion engine, comprising the steps of:
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a) detecting a rotational speed parameter according to a rotational speed of said engine b) calculating a reference value of the rotational speed parameter; c) calculating a difference between the reference value and the rotational speed parameter detected at every predetermined crank angle as a relative speed parameter; d) calculating an integrated value of the relative speed parameter, wherein the relative speed parameter is integrated for a period corresponding to 720/N degrees of a crank angle, where “
N”
is a number of cylinders of said engine; ande) performing a misfire determination based on the calculated integrated value. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification