Air-fuel ratio control system for internal combustion engines

Details Air-fuel ratio control system for internal combustion engines Air-fuel ratio control system for internal combustion engines

F - Mech Eng,Light,Heat,Weapons

02

D

F02D 9/00 (2006.01) F02D 41/14 (2006.01)

Patent

CA 2096382

An air-fuel ratio control system for an internal combustion engine includes a LAF sensor and an O2 sensor arranged in an exhaust pipe at respective locations upstream and downstream of a catalytic converter. A desired air-fuel ratio coefficient used in calculating an amount of fuel supplied to the engine is calculated based on operating conditions of the engine, and corrected based on output from the O2 sensor. The air-fuel ratio of a mixture supplied to the engine is feedback-controlled to a stoichiometric air-fuel ratio based on the corrected desired air-fuel ratio coefficient. When the output from the O2 sensor falls within a predetermined range, the desired air-fuel ratio coefficient is not corrected, but held at an immediately preceding value thereof.

Système de réglage du rapport air-carburant d'un moteur à combustion interne comprenant un capteur LAF et un capteur d'oxygène placés dans le tuyau d'échappement à des emplacements situés respectivement en amont et en aval du convertisseur catalytique. Le coefficient du rapport air-carburant voulu employé lors du calcul de la quantité de carburant fournie au moteur est établi en fonction des conditions d'utilisation du moteur, et corrigé en tenant compte d'un signal de sortie du capteur d'oxygène. Le rapport air-carburant du mélange alimentant le moteur est commandé par régulation à boucle fermée selon un rapport air-carburant permettant une combustion stoechiométrique fondé sur le coefficient corrigé pour le rapport air-carburant voulu. Lorsque le signal de sortie du capteur d'oxygène chute à l'intérieur d'un groupe de valeurs prédéterminées, le coefficient du rapport air-carburant n'est pas corrigé, mais maintenu à la valeur qui précède immédiatement ce groupe.

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