Measures for Further Reduction of Raw Emissions of HD-Diesel Engines

Authors

Dr.-Ing. L. Ruhkamp, Dr.-Ing. M. Krüger, FEV Motorentechnik GmbH, Aachen; Dipl.-Ing. S. Schönfeld, RWTH Aachen

Year

2005

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 595

Summary

Within this paper it is shown, that the reduction of the oxygen concentration of the intake air by exhaust gas recirculation plays the major role for NOx reduction. Especially for lowest NOx raw emission level by EGR further additional measures for NOx reduction can be neglected. However, with respect to the other emission species as well as the fuel consumption some favourable measures can be detected. Regarding the air side of the heavy duty diesel engine the gas density in the combustion chamber is of significant importance. Regardless whether the density is increased by temperature or pressure impact a clear benefit can be observed with respect to the particulate emission and the fuel consumption behaviour. However, especially if the boost pressure potential shall be used, it is absolutely necessary that the combustion system as well as the air management system of the engine is well tuned. This is also valid for the swirl potential that shows also a positive impact on the particulates and the fuel consumption, if the combustion system and the swirl behaviour are well matched. Another important way of efficient emission reduction at lowest oxygen concentration of the intake air is represented by the hydraulics respectively the fuel injection equipment. Positive effects on fuel consumption as well as on particulate emission could be detected if advanced injection timing as well as injection pressure increase is applied...

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