METHOD FOR CYLINDER EQUALIZATION OF A LAMBDA-CONTROLLED INTERNAL COMBUSTION ENGINE, IN PARTICULAR OF A MOTOR VEHICLE
First Claim
1. A method for cylinder equalization of a lambda-controlled internal combustion engine of a motor vehicle, comprising:
- trimming selected cylinders with respect to a mixture composition of metered fuel;
detecting one of an uneven running or uneven running change of the internal combustion engine caused by the trimming of the selected cylinders, wherein the one of the uneven running or uneven running change is detected in a reference state of the internal combustion engine;
detecting one of uneven runnings or uneven running changes during successive trimmings of the selected cylinders; and
performing cylinder equalization on the basis of a comparison of the one of the uneven running or uneven running change detected in the reference state to the one of the uneven runnings or uneven running changes detected during the successive trimmings.
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Abstract
In a method for cylinder equalization of a lambda-controlled internal combustion engine of a motor vehicle, cylinders to be tested are trimmed with respect to the mixture composition of metered fuel, and the cylinder equalization is carried out on the basis of an uneven running or uneven running change of the internal combustion engine caused by the trimming. In addition, the uneven running or uneven running change is detected in a reference state of the internal combustion engine. The uneven runnings or uneven running changes detected during successive trimmings of the cylinders to be tested are and compared to the uneven running values detected in the reference state.
51 Citations
17 Claims
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1. A method for cylinder equalization of a lambda-controlled internal combustion engine of a motor vehicle, comprising:
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trimming selected cylinders with respect to a mixture composition of metered fuel; detecting one of an uneven running or uneven running change of the internal combustion engine caused by the trimming of the selected cylinders, wherein the one of the uneven running or uneven running change is detected in a reference state of the internal combustion engine; detecting one of uneven runnings or uneven running changes during successive trimmings of the selected cylinders; and performing cylinder equalization on the basis of a comparison of the one of the uneven running or uneven running change detected in the reference state to the one of the uneven runnings or uneven running changes detected during the successive trimmings.
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2. A method for cylinder equalization of a lambda-controlled internal combustion engine of a motor vehicle, comprising:
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trimming selected cylinders with respect to a mixture composition of metered fuel; detecting at least one of uneven runnings or uneven running changes of the internal combustion engine caused by the trimming of the selected cylinders, wherein uneven runnings or uneven running changes which are detected in at least two successive trimming phases of the internal combustion engine are detected, and wherein in each of the at least two successive trimming phases at least one cylinder is enriched and at least one further cylinder is leaned essentially simultaneously; and performing cylinder equalization on the basis of a comparison of the uneven runnings or uneven running changes which are detected in the at least two successive trimming phases. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A non-transitory computer-readable data storage medium storing a computer program having program codes which, when executed on a computer, performs a method for cylinder equalization of a lambda-controlled internal combustion engine of a motor vehicle, the method comprising:
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trimming selected cylinders with respect to a mixture composition of metered fuel; detecting one of an uneven running or uneven running change of the internal combustion engine caused by the trimming of the selected cylinders, wherein the one of the uneven running or uneven running change is detected in a reference state of the internal combustion engine; detecting one of uneven runnings or uneven running changes during successive trimmings of the selected cylinders; and performing cylinder equalization on the basis of a comparison of the one of the uneven running or uneven running change detected in the reference state to the one of the uneven runnings or uneven running changes detected during the successive trimmings.
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17. A non-transitory computer-readable data storage medium storing a computer program having program codes which, when executed on a computer, performs a method for cylinder equalization of a lambda-controlled internal combustion engine of a motor vehicle, the method comprising:
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trimming selected cylinders with respect to a mixture composition of metered fuel; detecting at least one of uneven runnings or uneven running changes of the internal combustion engine caused by the trimming of the selected cylinders, wherein uneven runnings or uneven running changes which are detected in at least two successive trimming phases of the internal combustion engine are detected, and wherein in each of the at least two successive trimming phases at least one cylinder is enriched and at least one further cylinder is leaned essentially simultaneously; and performing cylinder equalization on the basis of a comparison of the uneven runnings or uneven running changes which are detected in the at least two successive trimming phases.
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Specification