Adaptive fuel control for an internal combustion engine

Details Adaptive fuel control for an internal combustion engine Adaptive fuel control for an internal combustion engine

F - Mech Eng,Light,Heat,Weapons

02

D

F02D 41/30 (2006.01) F02D 31/00 (2006.01)

Patent

CA 2529700

An adaptive fuel limit function (52) for protecting an internal combustion engine. The adaptive fuel limit function is a learning function responsive to trends in an engine performance parameter such as compensated fuel consumption per unit of power produced (62). The engine performance parameter is processed through a low pass filter (64) to allow changes in a fuel limit signal (54) in response to gradual changes in the fuel demand, such as may be due to wear in the engine, while blocking changes in the fuel limit signal in response to sudden changes in the fuel demand, such as may be due to a cylinder failure. The difference between the input and the output of the low pass filter may be processed to identify a failure level (88) for providing an alarm function distinct from the learning function.

L'invention concerne une fonction (52) adaptative de limitation de carburant destinée à protéger un moteur à combustion interne. La fonction adaptative de limitation de carburant est une fonction d'apprentissage sensible aux variations dans un paramètre de performances du moteur, tel que la consommation de carburant compensée par unité de puissance produite (62). Le paramètre de performances du moteur est traité par un filtre passe-bas (64), ce qui permet des variations dans un signal de limitation (54) de carburant en réponse à des variations graduelles dans la demande de carburant, due à l'usure dans un moteur, tout en bloquant les variations dans le signal de limitation de carburant en réponse à des variations soudaines dans la demande de carburant, due à une défaillance d'un cylindre. La différence entre l'entrée et la sortie du filtre passe-bas peut être traité pour identifier le niveau de défaillance (88), ce qui permet de produire une fonction alarme, distincte de la fonction d'apprentissage.

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