Variable displacement diesel engine

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

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F02D 17/02 (2006.01) F02B 3/08 (2006.01) F02B 77/00 (2006.01) F02D 41/12 (2006.01) F02D 41/36 (2006.01) F02D 45/00 (2006.01) F02P 19/02 (2006.01)

Patent

CA 2324404

In accordance with the invention, the number of operative cylinders (1, 2, 3) of Diesel engines (10) is reduced under low load by shutting off fuel injectors (1I, 2I, 3I) and deactivating the intake valves (1Vi, 2Vi, 3Vi) and exhaust valves (1Ve, 2Ve, 3Ve) to selected cylinders (1I, 2I, 3I). The inactive cylinders are heated up by glow plugs (1GP, 2GP, 3GP) to a minimum temperature prior to being reactivated. A computer (7) controls the number of operative cylinders (1, 2, 3) according to load, and to alternate between operative cylinders to provide for even wear so that maintenance cost is minimized.

Selon la présente invention, on réduit le nombre de cylindres opérationnels (1, 2, 3) de moteurs Diesel (10) soumis une à faible charge en fermant les injecteurs de carburant (1I, 2I, 3I) et en désactivant les soupapes d'admission (1Vi, 2Vi, 3Vi) et les soupapes d'échappement (1Ve, 2Ve, 3Ve) de cylindres sélectionnés (1I, 2I, 3I). Les cylindres inactifs sont chauffés par des bougies de préchauffage (1GP, 2GP, 3GP) à une température minimale avant d'être réactivés. Un ordinateur (7) commande le nombre de cylindres opérationnels (1, 2, 3) en fonction de la charge, et fait fonctionner les cylindres de manière alternée afin d'assurer une usure uniforme permettant de réduire les coûts d'entretien.

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