Future Heavy Duty Injection System as Technology Brick for Meeting 2025 CO2 Targets

Authors

Dr.-Ing. J. Weber, Y. Kakehashi, M.Eng., Dr.-Ing. O. Herrmann, DENSO AUTOMOTIVE Deutschland GmbH, Wegberg, Germany;
A. Ishihara, B.Eng., S. Tsujimoto, M.Eng., DENSO CORPORATION, Kariya, Japan;
Dipl.-Ing. T. Michaelis-Hauswaldt, Dr.-Ing. S. Schönfeld, Dr.-Ing. O. P. Bhardwaj, Dr.-Ing. M. Schönen, FEV Europe GmbH, Aachen, Germany

Summary

Current engine developments for heavy-duty truck applications are strongly focused on the increase of brake thermal efficiency. Major driver here is the fuel economy improvement required by the Greenhouse Gas / CO2 emission legislations in the EU, the USA and China. An essential way to improve the thermal efficiency is to increase the compression ratio (CR) while simultaneously enhancing the peak cylinder pressure capability at the same rated power level. 
The higher compression ratio is typically realized by a downscaled piston bowl. This, however, provides significant challenges regarding proper mixture formation. For minimizing the losses in the air path, the inlet ports are already designed for no swirl (quiescent combustion system). As consequence the fuel injection systems is the key component to achieve rated fuel economy and lowest pollutant emissions by enhanced mixture formation. 
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