Fault analysis method and fault analysis device for an internal combustion engine
First Claim
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1. A fault analysis method for an internal combustion engine having a plurality of cylinders, comprising:
- repeatedly determining an angular speed of the internal combustion engine, andadapting a parameter of the combustion process of one of the plurality of cylinders in order to equalize the times in which the internal combustion engine covers each of a plurality of angular intervals corresponding, to the plurality of cylinders, anddetermining an increase in the an angular speed of the internal combustion engine in each of the plurality of angular intervals, the angular speed increase in each angular interval resulting from an injection in a corresponding one of the cylinders,calculating an injection quantity for each cylinder based on the determined increase in angular speed corresponding to that cylinder,determining, base at least on the injection quantities calculated for each cylinder, that the one of the plurality of cylinders is defective.
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Abstract
In a fault analysis method for an internal combustion engine having a plurality of cylinders, an angular speed of the internal combustion engine is determined, and one parameter of the combustion process of one of the plurality of cylinders (6) is adapted in order to equalize the times taken by the internal combustion engine to cover in each case one angle interval. To provide a fault analysis method which makes it possible to detect a defective cylinder (6), it is determined that one of the plurality of cylinders (6) is defective on the basis of the value of the parameter.
21 Citations
17 Claims
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1. A fault analysis method for an internal combustion engine having a plurality of cylinders, comprising:
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repeatedly determining an angular speed of the internal combustion engine, and adapting a parameter of the combustion process of one of the plurality of cylinders in order to equalize the times in which the internal combustion engine covers each of a plurality of angular intervals corresponding, to the plurality of cylinders, and determining an increase in the an angular speed of the internal combustion engine in each of the plurality of angular intervals, the angular speed increase in each angular interval resulting from an injection in a corresponding one of the cylinders, calculating an injection quantity for each cylinder based on the determined increase in angular speed corresponding to that cylinder, determining, base at least on the injection quantities calculated for each cylinder, that the one of the plurality of cylinders is defective. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A fault analysis device for an internal combustion engine having a plurality of cylinders, having an angular speed determining device and having an internal combustion engine control device which is configured to:
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receive signals indicative of an angular speed of the internal combustion engine, adapt a parameter of the combustion process of one of the plurality of cylinders in order to equalize the times in which the internal combustion engine covers each of a plurality of angular intervals corresponding to the plurality of cylinders, determine an increase in the angular speed of the internal combustion engine in each of the plurality of angular intervals, the angular speed increase in each angular interval resulting from an injection in a corresponding one of the cylinders, calculate an injection quantity for each cylinder based on the determined increase in angular speed corresponding to that cylinder, determine, based at least on the injection quantities calculated for each cylinder, that the one of the plurality of cylinders is defective. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A fault analysis method for an internal combustion engine having a plurality of cylinders, comprising:
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determining an angular speed of the internal combustion engine, and adapting a parameter of the combustion process of one of the plurality of cylinders in order to equalize the times in which the internal combustion engine covers each of a plurality of angular intervals corresponding to the plurality of cylinders, and comparing an average value of the adapted parameter to at least one of a lower limit and an upper limit, comparing the average value of the parameter with an average value of the parameter without adaptation, and determining, based on (a) the comparison of an average value of the adapted parameter to the at least one of the lower limit and the upper limit and (b) the comparison of the average value of the parameter with the average value of the parameter without adaptation, that the one of the plurality of cylinders is defective. - View Dependent Claims (16, 17)
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Specification