GCI and CCS® - Two New Combustion Systems from Volkswagen

Authors

Dr.-Ing. W. Steiger, Dr.-Ing. C. Jelitto, Dipl.-Ing. S. Schmerbeck, Volkswagen AG, Wolfsburg

Year

2008

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 672

Summary

Besides complying with future exhaust emission legislation, new combustion engines will make a significant contribution towards reducing CO2 emissions. Within Group Engine Research at VOLKSWAGEN AG, concepts for further development of diesel and petrol engines with conventional fuels are being intensively investigated, up to and including the portrayal of concept vehicles. A focus of this work is the development of homogeneous, self-ignition combustion systems, which have already been depicted in the part load range for diesel and petrol engines in driveable prototypes.


To extend the self-ignition, homogeneous operating range, intensive research is also being carried out into new fuel specifications adapted to these conditions. This has led to the CCS® combustion system, which combines the advantages of the diesel and petrol combustion systems.


Whilst the initial results of system and fuel optimisation were reported on in 2005 in Vienna [1], the results of the second stage of optimisation will now be revealed. Following extensive studies with various fuel specifications, so-called naphtha fuel is now used for a self-ignition, homogeneous combustion system. In addition, dynamic control based on the cylinder pressure signal has been considerably refined. The naphtha fuel has the potential for further reduction of soot and NOx emissions.


In addition to the increased efficiency arising from the (partially) homogeneous self-ignited CCS® combustion system, the H/C ratio of naphtha, which is better than that of diesel, also results in a further CO2 advantage. All results have been validated in a research prototype based on a VOLKSWAGEN TOURAN.


In view of the future increase in diesel requirements in Europe and the current fuel mix from European refineries, new fuel specifications with a significantly reduced boiling range may become realistic.

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