Apparatus for detecting an occurence of misfiring in an engine cylinder
First Claim
1. A misfire detecting device for an internal combustion engine having a plurality of cylinders comprising:
- revolution detecting means for detecting a period of revolution of said engine;
arithmetic means for calculating a deflection in revolution of said engine for each of said cylinders on the basis of the period of revolution of said engine detected by said revolution detecting means in correspondence to the order of combustion of said cylinders;
smoothing means for smoothing the calculation value of the deflection obtained by said arithmetic means corresponding to each cylinder;
threshold value determining means for determining a misfire decision threshold value for said each cylinder on the basis of a predetermined value of the deflection and a value smoothed by said smoothing means corresponding to each cylinder; and
misfire deciding means for subjecting said arithmetic values provided by said arithmetic means and said threshold value to comparison, to determine whether a misfire in any one of said cylinders has occurred.
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Abstract
In a misfire detecting device for an internal combustion engine having a plurality of cylinders, revolution detecting device detects the revolution of an engine; arithmetic device calculates deflections in revolution of the engine for each of the cylinders on the basis of a period of revolution of the engine in correspondence to the order of combustion of the cylinders; threshold value determining device determines a misfire decision threshold value for the cylinders from a value obtained by smoothing arithmetic values which are determined for the cylinders by the arithmetic device, and a predetermined value; and misfire deciding device compares the arithmetic values provided by the arithmetic device with the threshold value to comparison, to determine the occurrence of a misfire in any one of the cylinders.
32 Citations
6 Claims
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1. A misfire detecting device for an internal combustion engine having a plurality of cylinders comprising:
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revolution detecting means for detecting a period of revolution of said engine; arithmetic means for calculating a deflection in revolution of said engine for each of said cylinders on the basis of the period of revolution of said engine detected by said revolution detecting means in correspondence to the order of combustion of said cylinders; smoothing means for smoothing the calculation value of the deflection obtained by said arithmetic means corresponding to each cylinder; threshold value determining means for determining a misfire decision threshold value for said each cylinder on the basis of a predetermined value of the deflection and a value smoothed by said smoothing means corresponding to each cylinder; and misfire deciding means for subjecting said arithmetic values provided by said arithmetic means and said threshold value to comparison, to determine whether a misfire in any one of said cylinders has occurred. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification