Control apparatus for an internal combustion engine
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Dec 22, 1992
Grant Date -
N/A
app pub date -
Dec 3, 1991
filing date -
Dec 7, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control apparatus for an internal combustion engine provided with a zeolite catalyst (6) capable of reducing NOx under oxidizing gas conditions includes an engine speed detecting sensor (11), an EGR control means (13), and an air-fuel ratio control means (16). The EGR control means (13) includes an EGR valve opening degree calculating means (15) for calculating an EGR valve opening degree based on air-fuel ratios which cause a current exhaust gas temperature to be in a predetermined temperature range at engine speeds lower than a predetermined engine speed and calculating an EGR valve opening degree which causes an amount of large molecular weight HC components in the exhaust gas to be more than a predetermined amount at engine speeds equal to or higher than the predetermined engine speed. The air-fuel ratio control means (16) includes an air-fuel ratio setting means (18) for setting a current air-fuel ratio to a lean air-fuel ratio calculated based on the EGR valve opening degree.
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