Control apparatus for an internal combustion engine

Power plants – Internal combustion engine with treatment or handling of... – Material from exhaust structure fed to engine intake

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Details

60301, 123571, 123698, F02M 2507

Patent

active

051725509

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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patent: 4771602 (1988-09-01), Ruiz et al.
patent: 5054460 (1991-10-01), Ogita

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