Trendsetting Small-Displacement EURO4 Transporter/ Commercial Vehicle Engine

Authors

Dipl.-Ing. M. Dietz, Dipl.-Ing. M. Hassler, Dipl.-Ing. G. Moll, Dipl.-Ing. K. Pranter, Dipl.-Ing. H. Hoffmann, Dr.-Ing. W. Eißler, DaimlerChrysler AG, Stuttgart

Year

2006

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 622

Summary

Development of a new engine for the Sprinter line of vans has been a formidable challenge, for not only must it comply with EU4 emission regulations for passenger cars, but must also meet those for use as a commercial vehicle (cargo, test bench homologation). The design must ensure mechanical durability and drivability at total weights of up to 7 tonnes (incl. trailer), and with various transmissions and multiple axle ratios. With market introduction of the new Mercedes Sprinters, the engines must be EURO4 capable. In this class, the reductions required in maximum permissible NOx values to 3.5 g/kWh (-30%) and in particulate values to 0.02 g/kWh (-85%) signify a technological transformation in this class. The challenge for the Mercedes Sprinter new-generation engines is to define a concept attractive to customers. The very low particulate emissions required make a particulate trap indispensable, while a full-load EGR concept ensures that NOx remains below limiting values. Engine operation with EGR at full load imposes very high requirements for the turbocharging system and exhaust gas recirculation control values. A modern piezo common rail injection system, innovative software functions and, not least, two-stage supercharging have resulted in the development of a very attractive and trendsetting unit. Thus the smalldisplacement, highly-turbocharged 2.2 L four-cylinder engine can achieve almost the output and torque values of the preceding five-cylinder engine. And yet, in the process, emissions and fuel consumption have been drastically reduced and drivability improved. Not only that, but there is a potential for compliance with future emission levels. With the OM 646 ATL², DaimlerChrysler has introduced the world’s first four-cylinder engine with twostage supercharging and its low-end torque and emissions concept has blazed new technological trails in the Sprinter’s market segment.

Order Members Login