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Mar 14, 2008
Berlin – The readers of the consumer journal "Guter Rat" and the magazine "SUPERillu" have chosen the DIESOTTO engine from Mercedes-Benz, which combines the best features of the gasoline and diesel power units, for the "Innovation der Vernunft" (Sensible Innovation) award. Federal Transport Minister Wolfgang Tiefensee presented the special award in Berlin today to Prof. Dr. Herbert Kohler, Vice President, head of Body and Powertrain Research and Development and Chief Environmental Officer of Daimler AG.
Werner Zedler, editor-in-chief of "Guter Rat", emphasized at the award ceremony: "Above all, the DIESOTTO from Mercedes-Benz – with a fuel consumption of 5.3 liters per 100 km in a sedan the size of an S-Class – goes to show that economical cars do not have to mean asceticism on wheels. The choice of this vehicle as a 'Sensible Car' and 'Sensible Innovation' is supporting this trend."
"We are especially pleased that the readers chose the DIESOTTO for the 'Sensible Innovation' award. This underscores the great significance that drivers attach both to economy and environment-friendliness, as well as to comfort and safety," added Prof. Dr. Herbert Kohler. "Our DIESOTTO shows how a gasoline engine can be designed in the not too distant future to be just as efficient as a diesel; it also demonstrates that the internal combustion engine will continue to play an important role for the future of individual mobility."
As powerful and agile as a V6 gasoline model, with the high torque and economy levels of a modern diesel, and extremely clean: Mercedes-Benz has united these specific advantages of the different types of engine in the groundbreaking four-cylinder DIESOTTO drive unit.
The DIESOTTO's innovative technology package includes direct fuel injection, turbocharging, and a variable compression ratio. The key to this innovation is homogeneous charge compression ignition (HCCI), a highly efficient combustion process similar to that of the diesel engine. The result is a four-cylinder unit with a displacement of only 1.8 liters that combines the strong points of the low-emission gasoline engine with the consumption advantages of the diesel drive unit. Despite a markedly reduced swept volume – "downsizing," one of the fundamental requirements for reducing fuel consumption – the compact drive unit produces the effortless performance and smooth running of a premium-class vehicle. With a power output of 175 kW/238 hp, which is supplemented by a further 15 kW/20 hp from a hybrid module, and a maximum torque of at least 400 Nm, the DIESOTTO's consumption amounts to only 5.3 liters of gasoline per 100 kilometers [44.4 mpg]; this yields a very low CO2 emission level of 127 grams per kilometer.
A further advantage is its minimal emission of nitrogen oxides. This is achieved through homogeneous combustion at a constant, relatively low temperature. For further emission control, a conventional three-way catalytic converter is quite sufficient for the DIESOTTO engine. This even ensures compliance with the more stringent emission standards to be introduced in future.
Features such as direct gasoline injection are already being used today in current Mercedes-Benz models such as the E 350 CGI and the CLS 350 CGI. At the next stage, further DIESOTTO modules are to be phased into series development.