Control strategy for turbocharged engine having variable...

Details Control strategy for turbocharged engine having variable... Control strategy for turbocharged engine having variable...

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F02D 23/00 (2006.01) F02B 33/00 (2006.01) F02B 37/16 (2006.01) F02D 13/02 (2006.01) F02D 23/02 (2006.01) F02D 31/00 (2006.01) F02D 41/00 (2006.01)

Patent

CA 2452042

A turbocharger (32) creates intake manifold boost for a diesel engine (10). At times, exhaust valve opening is increasingly retarded in relation to the engine operating cycle to cause the turbocharger (32) to increase boost, engine fueling is also increased in relation to the increased boost, and in response to any incipient surging of the compressor (38) resulting from such increasingly retarded exhaust valve opening and such increased engine fueling, compressed charge air is bled from the intake manifold (14) to counter the incipient surging and thereby avoid any significant turbocharger (38) surge.

Selon l'invention, un turbocompresseur (32) crée une élévation de la pression du collecteur d'admission d'un moteur diesel (10). A certains moments, l'ouverture de soupape d'échappement est de plus en plus retardée en relation avec le cycle de fonctionnement du moteur afin d'obtenir, de la part du turbocompresseur (32) une élévation plus importante de la pression d'admission, la carburation étant aussi augmentée en relation avec l'augmentation de l'élévation de pression, et en réponse avec tout effet d'amorce de pompage du compresseur (38) provoqué par une telle ouverture de plus en plus retardée de la soupape d'échappement et une telle augmentation de la carburation, l'air comprimé est prélevé du collecteur d'admission (14) afin de contrecarrer l'amorce d'effet de pompage et éviter ainsi tout pompage important du turbocompresseur (38).

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