Air-fuel ratio controlling device for an internal combustion engine
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United States of America Patent
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-
May 1, 2001
Grant Date -
N/A
app pub date -
Jun 8, 1999
filing date -
Jun 24, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In accordance with an output of an oxygen concentration sensor 16, an air-fuel ratio correction coefficient KO2 is periodically set to values respectively corresponding to a leaner air-fuel ratio and a richer air-fuel ratio with respect to a theoretical air-fuel ratio (steps S22 to S28). Based on an output of an oxygen concentration sensor 16, a NOx amount counter nNOx is counted up, and the amount of NOx absorbed by a NOx absorbent catalyst is estimated. When the value of the NOx amount counter nNOx reaches a preset value NSAT, an air-fuel ratio of an air-fuel mixture is set to be further richer than the richer air-fuel ratio.
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