Means for optimizing unit injectors for improved...

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F02M 45/00 (2006.01) F02M 57/02 (2006.01) F02M 59/26 (2006.01) F02M 63/00 (2006.01)

Patent

CA 2465771

A novel injection-pump plunger used in a unit injector for an EMD-type diesel engine has its upper (cut-off) control edge shaped to retard start of injection at full power from what it is with standard plungers, and to provide in a straight-line manner a relatively small increase in retardation from full load to idle. In a preferred form, the plunger has one or more steps in its upper (cut-off) control edge, the step or steps being formed between adjacent segments of the edge that are associated with different load points. A method of improving emissions/fuel-economy of EMD diesel engines comprises using prototype injection-pump plungers shaped within certain parameters, assessing their performance, selecting new patterns of timing based on the assessment, making new prototype plungers and assessing them, and repeating the steps of selecting, making and assessing if and as required until an assessment indicates compliance with applicable performance standards.

Un nouveau plongeur de pompe d'injection qui équipe un injecteur pour un moteur diesel du type EMD comporte un bord de commande (coupure) supérieur formé de façon à retarder le début de l'injection à pleine puissance par rapport aux plongeurs normaux, et à assurer de manière directement proportionnelle une augmentation relativement petite de retardement entre la position à pleins gaz et le ralenti. Dans une version préférable, le plongeur comporte une ou plusieurs étapes sur son bord de commande (coupure) supérieur, la ou les étapes étant formées entre des segments adjacents du bord qui sont associés à des points de charge imposée. Une méthode de réduction des émissions polluantes/de la consommation de carburant des moteurs diesel du type EMD consiste à utiliser des prototypes de plongeurs de pompe d'injection formés selon certains paramètres, à fabriquer des prototypes de plongeurs et à les évaluer, puis à répéter les étapes de sélection, de fabrication et d'évaluation au besoin jusqu'à qu'une évaluation indique une conformité aux normes de rendement pertinentes.

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