Ignition timing controlling device and method

F - Mech Eng,Light,Heat,Weapons – 02 – P

Patent

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F02P 5/15 (2006.01) F02D 45/00 (2006.01)

Patent

CA 2545713

A method of controlling ignition timing of an engine. In the control method, final ignition timing for performing ignition is calculated by adding a variation component to a set ignition timing. According to the final ignition timing, an indicated average effective pressure of an in-cylinder pressure detected when ignition is performed is calculated. An ignition timing characteristic curve indicating the correlation between the indicated average effective pressure and the variation component is estimated and optimal ignition timing is calculated from the characteristic curve. Feedback control for converging the set ignition timing to the optimal ignition timing is then performed. Consequently, the ignition timing is controlled to an optimal ignition timing corresponding to a current operational state of the engine.

L'invention concerne une méthode de contrôle de synchronisation d'allumage d'un moteur. Dans la méthode de contrôle de l'invention, la synchronisation d'allumage finale destinée à effectuer l'allumage, est calculée par l'ajout d'un composant de variation à une synchronisation d'allumage établie. Selon la synchronisation d'allumage finale, on calcule une pression efficace moyenne indiquée d'une pression dans le cylindre, détectée lorsque s'effectue l'allumage. Une courbe caractéristique de synchronisation d'allumage indiquant la corrélation entre la pression efficace moyenne indiquée et le composant de variation est estimée, et la synchronisation d'allumage optimale est calculée à partir de la courbe caractéristique. Le contrôle de rétroaction permettant de faire converger la synchronisation d'allumage établie vers la synchronisation d'allumage optimale, s'effectue ensuite. Par conséquent, la synchronisation d'allumage est contrôlée pour obtenir une synchronisation d'allumage optimale correspondant à l'état de fonctionnement actuel du moteur.

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