Method for desulfurization of an NOx storage accumulator-catalyst arranged in an exhaust system of an internal combustion engine
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United States of America Patent
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Sep 13, 2005
Grant Date -
Jul 17, 2003
app pub date -
Dec 5, 2000
filing date -
Dec 17, 1999
priority date (Note) -
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Abstract
A method for the desulfurization of an NOx storage catalyst arranged in an exhaust system of an internal combustion engine, whereby, for the desulfurization, the internal combustion engine is alternatingly operated in a lean mode at λ>1 and a rich mode at λn), whereby the interval (In) lasts from the beginning of an nth rich operating phase (Tf,n), until the measured value drops below a predetermined lambda threshold value (Sf) downstream from the NOx storage catalyst (16). Furthermore, the progress of the desulfurization is monitored, using a change in a lambda probe voltage (Un) downstream from the NOx storage catalyst (16), which is determined at the end of a predetermined interval at the beginning of an nth rich operating phase (Tf,n).
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