Method of diagnosis of multi-cylinder internal combustion engines and means for carrying out the method
First Claim
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1. A method, comprising the following steps:
- suppressing ignition of a multi-cylinder internal combustion engine;
obtaining measurements of cylinder-specific operating characteristics of said engine;
numbering said measurements;
ceasing suppression of said ignition; and
identifying said measurements with respective cylinders.
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Abstract
For allocating to the respective cylinders cylinder-specific measured val taken from an internal combustion engine under test with the ignition suppressed the measured values are continuously numbered while the ignition is suppressed. After the suppression of the ignition has ceased the numbering is continued at least until the occurrence of the measured value from a cylinder determined by the ignition, after which, bearing in mind the known firing order of the engine, all the measured values can be allocated to the respective individual cylinders.
7 Citations
22 Claims
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1. A method, comprising the following steps:
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suppressing ignition of a multi-cylinder internal combustion engine; obtaining measurements of cylinder-specific operating characteristics of said engine; numbering said measurements; ceasing suppression of said ignition; and identifying said measurements with respective cylinders. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus, comprising:
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means for obtaining measurements of cylinder-specific operating characteristics of a multicylinder internal combustion engine; means for receiving and evaluating such measurements; means for numbering said measurements; means for identifying ignition top dead center in a cylinder coupled to said means for evaluating said measurements; and means for identifying said measurements with respective cylinders in response to recognition of ignition top dead center in said cylinder coupled to said means for evaluating said measurements. - View Dependent Claims (12, 13)
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14. An apparatus comprising:
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measurement means for deriving a characteristic signal representative of a cylinder-specific operating characteristic of a multi-cylinder internal conbustion engine, said signal having segments which are associated with individual cylinders and representative of such operating characteristic of said cylinder; ignition sensor means for recognizing ignition top dead center in a cylinder and for transmitting an ignition top dead center recognition signal; and allocation means for identifying said characteristic signal segments with respective cylinders including, means coupled to said measurement means for receiving and numbering characteristic segments as said segments are derived, means coupled to said ignition sensor means for receiving said ignition top dead center signal and for associating a characteristic signal segment with a selected cylinder upon simultaneous receipt of said characteristic signal segment and an ignition top dead center signal from said selected cylinder, and means for retrospectively matching said characteristic signal segments with respective cylinders according to a known cylinder firing order and said segment numbering. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification