System and method for determining target oxygen storage in an automotive catalyst
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United States of America Patent
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Aug 3, 2004
Issued Date -
N/A
app pub date -
Jun 10, 2002
filing date -
Jun 20, 2001
priority date (Note) -
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Abstract
The invention relates to a new method and system for optimizing the efficiency of an automotive catalytic converter. The invention comprises adjusting an air/fuel ratio in the cylinders of an internal combustion engine to maintain the amount of oxidants stored in the catalyst at or near an oxidant target value. The oxidant target value is either a pre-determined constant value or a dynamically-determined value that is calculated based on engine operating conditions. The air/fuel ratio in the cylinders is adjusted based on the magnitude of the difference between the actual oxidant amount and the target oxidant amount to prevent NOx and hydrocarbon breakthrough.
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