Cleanest diesel technology with excellent fuel economy: BLUETEC – the future of diesel is blue

Jun 12, 2007
Impressive output, high torque, a low fuel consumption and very low exhaust emissions – the Vision BLUETEC models in the GL, M- and R-Class demonstrate that this innovative drive technology is particularly able to develop its potential in large, high-performance SUVs.
The promising future of the BLUETEC concept is well illustrated by the Vision GL 320 BLUETEC. This muscular SUV with a powerful V6 diesel engine has an output of 165 kW/224 hp and a torque of 510 newton metres, has an average fuel consumption of only 9.9 litres of diesel per 100 kilometres and meets the most stringent worldwide exhaust emission standards.
BLUETEC is a technology developed by DaimlerChrysler for the effective reduction of fuel consumption and exhaust emissions in diesel vehicles. It is particularly aimed at the nitrogen oxides, the only diesel exhaust gas component whose levels are still inherently above those of petrol engines. Mercedes-Benz
has developed two versions of the modular BLUETEC emissions control system: in the E 320 BLUETEC saloon already launched in the USA, an oxidising catalytic converter and a particulate filter are combined with an improved, particularly durable storage-type NOx catalytic converter and an additional SCR converter. The second BLUETEC version is even more effective, and can also be used in the Vision GL 320 BLUETEC, Vision ML 320 BLUETEC and Vision R 320 BLUETEC shown here. In this case AdBlue, a harmless, aqueous urea solution, is sprayed into the exhaust tract, where the downstream SCR catalytic converter reduces
up to 80 percent of the nitrogen oxides to harmless nitrogen and water. Which BLUETEC system is used depends on the relevant vehicle concept and weight, as well as the required Nox reduction. In each case the aim remains the same: BLUETEC makes the diesel the cleanest diesel in the world in every vehicle class, and thereby offers the potential to meet even the most stringent exhaust emissions standards.
Development focus on reducing untreated emissions
The main focus of the development engineers is not only on the aftertreatment of exhaust gases, however. They also see it as their task to minimise the nitrogen oxides as far as possible by in-engine measures, for the lower the untreated emissions, the more effective the emissions control measures can be. Accordingly the engine specialists at Mercedes-Benz are working intensively to optimise the engines and their combustion processes. As in series production engines, the "hardware" of the latest BLUETEC units includes four-valve technology, third-generation common-rail direct injection, turbochargers with variable geometry and exhaust gas recirculation. A highly sensitive, electronic engine management system responds precisely to widely varying operating conditions and optimises the combustion processes.
This BLUETEC technology from Mercedes-Benz benefits from the company’s extensive know-how in building low-emission commercial vehicles, where the technology has been in successful operation since early 2005 and is now available for all model series. DaimlerChrysler has already delivered more than 60,000 Mercedes-Benz trucks and buses equipped with this trailblazing technology.
And with the E 320 BLUETEC, the first passenger car to feature this technology celebrated its debut to great acclaim in the USA in 2006. The car was voted "2007 World Green Car", and therefore honoured as a pacemaker for a new diesel technology with particularly low emissions.
Exhaust gas aftertreatment with BlueTec (AdBlue injection) shown on the example of the Vision GL 320 BlueTec concept car, 2006
BLUETEC – the technology for the cleanest diesel in the world