Internal combustion engine and method of operating the same
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United States of America Patent
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-
Sep 19, 2000
Grant Date -
N/A
app pub date -
Sep 10, 1998
filing date -
Sep 11, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention is directed to an internal combustion engine such as an engine for a motor vehicle. The engine defines a combustion chamber wherein an air/fuel mixture is combusted during operation of the engine whereby an exhaust gas containing nitrogen oxides is generated. The engine has a catalytic converter for treating the exhaust gases including reducing the nitrogen oxides. The air/fuel mixture supplied to the combustion chamber is adjusted in such a manner that first an oxygen excess is present in the combustion chamber and then an oxygen deficiency is present. A control apparatus determines the mass (mNOx) of the nitrogen oxides flowing to the catalytic converter during oxygen excess and changes over from the oxygen excess to the oxygen deficiency when the mass (mNOx) reaches a pregiven inflow mass (mZ).
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