Air-fuel ratio controller of internal combustion engine

Details Air-fuel ratio controller of internal combustion engine Air-fuel ratio controller of internal combustion engine

F - Mech Eng,Light,Heat,Weapons

02

D

F02D 41/14 (2006.01) B01D 53/94 (2006.01) F01N 3/28 (2006.01) F02D 41/02 (2006.01)

Patent

CA 2450172

An air-fuel ratio control apparatus according to the present invention estimates, on the basis of an exhaust air-fuel ratio of exhaust gas flowing into an exhaust purifying catalyst unit 19 disposed in an exhaust passage 7 of an engine 1, an emission of at least one specific component contained in exhaust gas flowing out of the exhaust purifying catalyst unit. The air-fuel ratio control apparatus performs the estimation by use of a model, and controls the air-fuel ratio in such a manner that the estimation value reaches a target state. The model is previously determined in consideration of the mass balance of the specific component.

L'invention concerne un dispositif de commande du rapport air-combustible dans lequel, en fonction du rapport air-combustible de l'émission de gaz d'échappement passant dans un catalyseur de commande d'émission de gaz d'échappement (19) placé dans le passage d'émission de gaz d'échappement (7) d'un moteur (1), la quantité libérée d'au moins un constituant spécifique contenu dans l'émission de gaz d'échappement passant dans le catalyseur de commande d'émission d'échappement vers l'extérieur est estimée à l'aide d'un modèle. Ce modèle est déterminé en prenant en compte le bilan pondéral du constituant spécifique, et le rapport air-combustible est commandé de façon qu'une valeur estimée devienne une valeur cible.

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