Downsizing and Stratified Operation – an Attractive Combination Based on a Spray-guided Combustion System

Authors

Dr.-Ing. M. Wirth, Dipl.-Ing. D. Zimmermann, Dr. M. Davies, Dipl.-Ing. B. Pingen, Dipl.-Ing. D. Borrmann, Ford Werke GmbH, Cologne

Year

2006

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 622

Summary

Downsizing and turbo charging in combination with direct injection is now commonly regarded as a key technology for gasoline engines to cope with the challenges of fuel economy enhancement and driveability improvement. In a strategy to meet future fleet CO2 emission limits, it is a cornerstone of any technology walk. In view of stepwise more stringent limits, it has to be extended by additional technology elements in order to further augment the fuel economy improvement potential beyond the initial achievements. Here, stratified part load operation can become an attractive solution again if the maximum fuel economy potential of a spray guided gasoline DI combustion system is available. While the combination of turbo charged DI and spray guided stratified operation exhibits some key development challenges to be resolved, it also provides attractive synergies for emission concepts up to PZEV capability just by injection strategy. The analysis of a vehicle application with different power/weight ratios reveals that the fuel economy potential is sensitive as expected to the drive cycle applied but it can provide an attractive additional fuel economy benefit at reasonable cost/benefit ration for the customer.

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