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Daimler receives Porsche Prize for diesel aftertreatment system in OM 654

The Professor Ferdinand Porsche Prize was awarded by Vienna University of Technology to Anke Kleinschmit, Head of Corporate Research & Sustainability and Environmental Officer for Daimler AG, for the development of the innovative exhaust gas aftertreatment system in the new OM 654 four-cylinder diesel engine (earlier post). The went into series production in 2016 and stands out for the fact that NOx emissions stay low in real operating conditions.


The automotive engineering prize is awarded once every two years to people who have made a significant contribution to the development of the motor vehicle with their innovation(s). The four-cylinder diesel engine, developed under the leadership of Bernhard Heil, is designed to meet future emissions legislation (RDE – Real Driving Emissions) and stands out for its exemplary efficiency and low NOx emissions.

This is made possible by, among other features, a newly-developed stepped-bowl combustion process; exhaust treatment technologies configured directly on the engine together with multiway exhaust gas recirculation using cooled high-pressure and low-pressure technology. This innovative technology package significantly reduces the engine’s untreated emissions across all characteristics.

The four-cylinder diesel engine has already earned a good reputation for its performance out on the road. The engineers for the industry magazine auto, motor und sportwere surprised by the four-cylinder’s extraordinarily low nitrogen oxide emissions”. And ADAC commented, after road tests of the diesel engine: “The exhaust gas treatment works extremely well, regardless of whether the vehicle’s on the test station or driving in real traffic.



Well, all the real driving emissions (RDE) tests I have seen confirm the low NOx mentioned in the article. Generally, ~50% lower than the limit for chassis dynamometer and ~80% lower than the RDE limit to be introduces shortly. Yet, not all technical features commercially available have been used on this engine, implying that further emission reductions would be possible. Most notably would be a NOx storage catalyst (replacing the oxidation catalyst) and direct ammonia injection (e.g. Amminex concept). This just shows that a modern engine can meet very strict NOx emission limits also in real-driving conditions. Of course, these solutions could be "copied" by any other manufacturer.


Heaven forbid copying technology that might be illegal. We should just adopt expired patent WW1 gas masks?


You should think twice before publishing such stupid comments on this site, albeit that it is not illegal to do so.

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