Method of diagnosing an NOx storage catalytic converter during operation of an internal combustion engine
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United States of America Patent
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Apr 17, 2001
Grant Date -
N/A
app pub date -
Jan 19, 1999
filing date -
Jan 17, 1998
priority date (Note) -
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Abstract
The invention is directed to diagnosing a catalytic converter capable of storing nitrogen oxides and mounted in the exhaust-gas system of an internal combustion engine. A signal-emitting exhaust-gas probe is provided rearward of the catalytic converter and the exhaust gas forward of the catalytic converter is influenced by increasing components in the exhaust gas which are effective as a reducer thereby triggering a change of the signal. The time elapsed between the start of the influencing and the change of the signal is evaluated to diagnose the catalytic converter.
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