Internal combustion engine with NOx absorbent catalyst
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United States of America Patent
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Sep 12, 2000
Grant Date -
N/A
app pub date -
Jun 9, 1998
filing date -
Jun 9, 1997
priority date (Note) -
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Abstract
For proper treatment of NOx released from NOx absorbent catalyst as well as HC and CO in exhaust gas, a measure of A/F of exhaust gas downstream of the NOx absorbent is used as the input to a feedback control loop. The feedback control loop alters a feedback correction factor (or coefficient) of a fuel control command applied to each fuel injector in such a direction to decrease a deviation of the actual A/F input from a target A/F (stoichiometry or rich) When the measure of A/F has switched the side to rich, a measure of A/F of exhaust gas upstream of the NOx absorbent catalyst is used as the input to perform usual feedback control loop to maintain lean combustion mode.
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