Process for cylinder-selective leakage testing of the combustion chambers in a combustion engine
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United States of America Patent
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-
Nov 19, 2002
Grant Date -
Dec 6, 2001
app pub date -
May 22, 2001
filing date -
May 25, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A process for the cylinder-selective leakage testing of the combustion chambers of a combustion engine is carried out during engine operation, but with the combustion process being suppressed. From the time progression of an engine shaft speed value, engine shaft speed differentials are determined respectively for each cylinder. Then a respective value for the compression pressure is allocated to each engine shaft speed differential. Preferably, the respective engine shaft speed differential is determined as the difference between the minimum engine shaft speed immediately following the top dead center position of a respective cylinder and the subsequent maximum engine shaft speed for this cylinder.
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