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 2078492

An air-fuel ratio control system for an internal combustion engine controls the air-fuel ratio of a mixture supplied to the engine to a desired air-fuel ratio in response to an output from an exhaust gas ingredient concentration sensor. a first value of the desired air-fuel ratio is calculated based on the rotational speed of the engine and the load on the engine. A second value of the desired air-fuel ratio is calculated based results of determination on whether a vehicle on which the engine is installed has just started from a standing position thereof. A third value of the desired air-fuel ratio is calculated based on results of determination on whether the temperature of the engine is lower than a predetermined value. The largest value of at least the first to third values of the desired air-fuel ratio is set to a final value of the desired air-fuel ratio.

L'invention concerne un système de commande pour moteur à combustion interne permettant de régler le rapport du mélange air-carburant fourni au moteur à une valeur souhaitée en fonction d'un signal de sortie transmis par un capteur de concentration d'ingrédients de gaz d'échappement. Une première valeur du rapport air-carburant souhaité est calculée en fonction de la vitesse de rotation et de la charge du moteur. Une deuxième valeur est calculée en se basant sur le fait que le véhicule sur lequel est installé le moteur vient ou non de démarrer. Une troisième valeur est calculée en fonction du fait que la température du moteur est inférieure ou non à une valeur prédéterminée. La valeur la plus élevée des trois donne la valeur finale du rapport air-carburant souhaité.

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