Exhaust valve timing control responsive to engine idling and...

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

Patent

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F02D 9/04 (2006.01) F02D 9/08 (2006.01) F02D 13/02 (2006.01)

Patent

CA 2164204

A method of operating a two-stroke cycle internal combustion engine having at least one exhaust port communicating with each combustion chamber of the engine and an exhaust valve operably associated with at least one said exhaust port to control the timing of the opening and the flow area through said exhaust port between maximum and minimum values, the method comprising advancing the timing of the opening of the exhaust port in response to idle or low load operation to the maximum extent to maximise the flow area through the exhaust port. Other engine management operations disclosed and claimed include: positioning the exhaust valve to reduce the flow area to the minimum extent on cessation of operation of the engine, and, impacting the exhaust valve against the limits defining the maximum and minimum values of valve movement to promote dislodgement of carbon deposits.

Procédé de commande du fonctionnement d'un moteur deux temps à combustion interne dans lequel au moins un orifice d'échappement communique avec chaque chambre de combustion du moteur et une soupape d'échappement associée fonctionnellement à ce (ou ces) orifice(s) d'échappement pour commander la synchronisation de l'ouverture et l'aire d'écoulement à l'intérieur de cet orifice d'échappement entre ses valeurs maximale et minimale; ce procédé consistant à avancer au maximum la synchronisation de l'ouverture de l'orifice d'échappement en réponse au fonctionnement au ralenti ou à faible charge afin de maximiser l'aire d'écoulement à l'intérieur de l'orifice d'échappement. D'autres opérations de gestion du moteur comprennent: le positionnement de la soupape d'échappement afin de réduire au minimum l'aire d'écoulement lorsque le moteur cesse de fonctionner et, le choc de la soupape d'échappement contre les limites définissant les valeurs maximum et minimum du mouvement de la soupape pour favoriser l'élimination des dépôts de calamine.

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