Method for operating a nitrogen oxide (nox) storage catalyst
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United States of America Patent
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Jun 7, 2005
Grant Date -
Sep 11, 2003
app pub date -
Jul 11, 2001
filing date -
Jul 26, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a method for operating a nitrogen oxide (NOx) storage catalytic converter (12′). During a first operating phase of the storage catalytic converter (12′), nitrogen oxides are stored and, during a second operating phase, stored nitrogen oxides are discharged from the converter (12′). The stored quantity of nitrogen oxides is determined during the first operating phase. In order to be able to determine start and end of the second operating phase as accurately as possible, a quantity, which characterizes the discharge quantity of nitrogen oxides, is determined during the second operating phase and compared to the stored quantity of nitrogen oxides determined during the first operating phase. With the comparison, a plausibility check and a calibration of the output signal of a nitrogen oxide (NOx) sensor (14′) can take place. The nitrogen oxide (NOx) sensor (14′) is disposed downstream of the storage catalytic converter (12′).
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