Running of an internal combustion engine in conjunction with an NOx-accumulator catalytic converter
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United States of America Patent
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-
Dec 4, 2001
Grant Date -
N/A
app pub date -
Aug 16, 1999
filing date -
Dec 15, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method is presented for controlling the supply of reducing agent to a NOx-storage catalytic converter of an internal combustion engine, which is operated at least at times with a lean air/fuel mixture, with an exhaust-gas sensor mounted in flow direction rearward of the NOx-storage catalytic converter; wherein the supply of the reducing agent takes place repeatedly in time intervals separate from each other; and wherein the reducing agent quantity, which is supplied in each time interval, is reduced compared to that quantity which is supplied in a previous supply phase in which a reaction of the exhaust-gas sensor occurred.
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