The New Mercedes-Benz 3-litre V6-LDV-Diesel Engine OM 642 – A Compact and Lightweight High-Performance and High-Variability Power Unit

Authors

Dipl.-Ing. G. Doll, Dr.-Ing. J. Schommers, Dr.-Ing. A. Lingens, Dipl.-Ing. M. Düsmann, Dipl.-Ing. H. Fausten, Dipl.-Ing. R. Noell, Dipl.-Ing. C. Spengel, Dipl.-Ing. H. Finkbeiner, DaimlerChrysler AG, Mercedes-Benz Technology Center, Stuttgart

Year

2005

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 595

Summary

With the OM 642 engine Mercedes-Benz engineers have developed a high-quality and very compact V6 LDV-diesel assembly which, due to its conception and design, can also replace the previous 5- and 6-cylinder in-line engines in all vehicle model series. Basic objectives were: A specific output of 55 kW / litre displacement, a specific torque of 170 Nm / litre displacement, an installation weight similar to the in-line 5-cylinder engine to be replaced, installation space in accordance with in-line 5-cylinder engine to be replaced, compliance with emission legislation as per EU-4 even without a particulate trap, use of a third-generation injection system with piezo-injectors and high injection variability for optimized combustion management in terms of emissions and noise. The contribution describes the conception and technical data of the new assembly and deals with both the in-engine planning data on the one hand, and on the other, performance and fuel consumption compared to preceding cars in the C-class. In addition to in-engine properties, the conception of the emission system is of particular importance for current advanced emission limits as per EU-4. Despite compliance with current emission limits as per EU-4 without using a particulate trap, a particulate trap is installed as standard in many parts of Europe. The actual particulate trap and regeneration design without additives are dealt with in detail. Besides the technical and scheduled targets, the quality and reliability of the component have top priority in the requirement specifications. Information is provided on the type and scope of the extensive verification by endurance test runs. The high investment made in the production of this component in a DaimlerChrysler plant in Berlin is a tribute to Germany as a production location.

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