Abstract
Keywords: BlueTEC, AdBlue, NOx-storage catalyst, SCR-catalyst, dosing system
After the world wide first diesel particulate filter application in 1985 Mercedes-Benz introduced the first BlueTEC technology in 2006 in the E-class. In the next steps the BlueTEC technology is further developed for the California market and the heavier SUV class.
This article describes the functionality and requirements for the complete system.
The BlueTEC technology contains an optimized diesel engine and combustion system, an aftertreatment system with DOC, DPF and either with a NOx-storage catalyst or an active SCR catalyst with AdBlue dosing system and an enhanced ECU functionality and calibration. For fulfilling the worlds strongest emission limits of the US legislation with BlueTEC with SCR catalyst there have to be solutions developed for the handling of AdBlue under cold climate, managing the refilling event and the onboard diagnostic. To ensure the emission stability over the full useful life on the high NOx conversion level, intensive testing of the catalyst technology had to be done. In addition there are self learning functionalities for adapting the dosing strategy to ensure the maximum NOx performance. The SCR system is an effective technology to reduce NOx within limited HC emissions with excellent long term durability.
With the BlueTEC technology Mercedes-Benz developed a new diesel powertrain that is as clean as a gasoline engine but with the well known torque and efficiency of the diesel engines and has the potential of fulfilling all valid emission standards all over the world. Mercedes-Benz will introduce the BlueTEC technology for the US market in the SUV segment with the MY 2009.