Exhaust gas purifying system
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United States of America Patent
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-
Mar 26, 1996
Grant Date -
N/A
app pub date -
Mar 22, 1994
filing date -
Mar 31, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An exhaust gas purifying system for an automobile engine is equipped with a metal zeolite catalytic converter for deoxidizing and purifying nitrogen oxides in exhaust gas. The system controls and compulsorily changes the air-fuel ratio of the fuel mixture injected into the automobile engine based on a target air-fuel ratio only when the temperature of the exhaust gas, before entering the catalyst, is greater than a specific temperature.
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