Apparatus for detecting misfire in internal combustion engine
First Claim
1. A misfire detecting apparatus for an internal combustion engine, comprising:
- rotation signal outputting means responsive to a rotation of said engine for outputting a rotation signal at every predetermined rotational angle;
actual value calculating means for calculating an actual value by measuring a time taken for a revolution of a predetermined rotational angle in an explosion stroke of each cylinder of said engine on the basis of said rotation signal outputted from said rotation signal outputting means;
first variation setting means for setting a first variation by obtaining a deviation between the actual values obtained in connection with two cylinders of said engine, which successively take the explosion strokes, on the basis of the calculation results of said actual value calculating means;
second variation setting means for setting a second variation by obtaining a deviation between the actual values obtained in connection with two cylinders of said engine, which successively take the explosion strokes, on the basis of information from said rotation signal outputting means and said actual value calculating means, the actual values used by said second variation setting means being 360°
CA in the rotational angle before the actual values used by said first variation setting means; and
misfire detecting means for detecting an occurrence of misfire in said engine on the basis of said first and second variations.
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Accused Products
Abstract
A misfire detecting apparatus for an internal combustion engine which detects the occurrence of misfire in the engine on the basis of a rotation signal outputted in accordance with the rotation of the engine at every predetermined rotational angle a crank shaft of said engine. The apparatus successively calculates a time taken for revolution of the engine by a predetermined crank angle on the basis of the rotation signals outputted from the rotational angle sensor and then sets first and second decision values on the basis of the calculated times in connection with two cylinders of the engine which successively take explosion strokes. The second decision value is set at 360 degrees in the engine rotational angle previous to the setting of the first decision value. The apparatus detects the occurrence of misfire on the basis of the first and second decision values. This arrangement can accurately detect the occurrence of misfire irrespective of the difference in average speed between the respective cylinders.
27 Citations
11 Claims
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1. A misfire detecting apparatus for an internal combustion engine, comprising:
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rotation signal outputting means responsive to a rotation of said engine for outputting a rotation signal at every predetermined rotational angle; actual value calculating means for calculating an actual value by measuring a time taken for a revolution of a predetermined rotational angle in an explosion stroke of each cylinder of said engine on the basis of said rotation signal outputted from said rotation signal outputting means; first variation setting means for setting a first variation by obtaining a deviation between the actual values obtained in connection with two cylinders of said engine, which successively take the explosion strokes, on the basis of the calculation results of said actual value calculating means; second variation setting means for setting a second variation by obtaining a deviation between the actual values obtained in connection with two cylinders of said engine, which successively take the explosion strokes, on the basis of information from said rotation signal outputting means and said actual value calculating means, the actual values used by said second variation setting means being 360°
CA in the rotational angle before the actual values used by said first variation setting means; andmisfire detecting means for detecting an occurrence of misfire in said engine on the basis of said first and second variations. - View Dependent Claims (2, 3, 4)
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5. A misfire detecting apparatus for an internal combustion engine, comprising:
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rotational angle sensor means for outputting a rotation signal at every predetermined rotational angle of said engine; time calculating means for successively calculating a time taken for revolution of said engine by a predetermined angle on the basis of the rotation signals outputted from said rotational angle sensor means; decision value setting means for setting first and second decision values to be used for a decision of an occurrence of a misfire in said engine on the basis of the times calculated by said time calculating means in connection with two cylinders of said engine which successively take explosion strokes, said second decision value being set at 360 degrees in the engine rotational angle previous to the setting of said first decision value; and misfire detecting means for detecting an occurrence of misfire on the basis of said first and second decision values. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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Specification