Method for diagnosing an exhaust gas cleaning system of a lambda-controlled internal combustion engine
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United States of America Patent
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Oct 5, 2004
Grant Date -
Dec 4, 2003
app pub date -
Oct 9, 2002
filing date -
Apr 11, 2000
priority date (Note) -
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Abstract
A method for diagnosing an exhaust gas cleaning system of a lambda-controlled internal combustion engine where a catalyst is subjected to a specific oxygen load which is greater than the normal operating load, by increasing the surface covered by the oscillation of a signal of a pre-catalyst lambda probe according to a set value. The exhaust gas cleaning system can be tested by evaluating the oscillation of a signal of a post-catalyst lambda probe. In the event this diagnosis shows a defect in the exhaust gas cleaning system without the area covered by the oscillation of the probe signal of the pre-catalyst lambda probe having had to be increased to or beyond a set value, the pre-catalyst lambda probe is defective. Otherwise, it can be concluded that the catalyst is defective.
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