Mercedes-Benz Vision C 220 Bluetec Concept

Mercedes-Benz unveiled its highly environmentally-compatible BLUETEC emission-control technology in combination with a consumption-optimized four-cylinder engine. In terms of ensuring compliance with the even stricter EURO 6 emission standard, applicable to all new vehicles Europe-wide from 2015, the Vision C 220 BLUETEC shows the way ahead. Boasting an output of 170 hp and a peak torque of 400 Nm, the Vision C 220 BLUETEC now requires 5.5 liters of diesel per hundred kilometers, thanks largely to modified diesel engine technology and an intelligent system of energy management.

"The sophisticated four-cylinder diesel engine with BLUETEC emission control is a prime example of leading-edge, future-compatible technology," explains Dr Dieter Zetsche, Chairman of the Board of Management of DaimlerChrysler AG and Head of the Mercedes Car Group. "Our diesel strategy is an effective answer to the question of how to save fuel and, therefore, CO2, to further reduce all exhaust emissions including NOx and yet still ensure effortlessly superior driving enjoyment. In this respect, we believe our state-of-the-art diesel concept is currently the best and most efficient solution available."

With the Vision C 220 BLUETEC, Mercedes-Benz is providing a taste of things to come as part of its BLUETEC initiative which was launched in the US last autumn. The initial impetus came from the market launch of the E 320 BLUETEC in North America in October 2006, which was timed to coincide with the introduction of low-sulphur diesel in that part of the world. A fuel consumption figure of 6.7 liters per hundred kilometers makes the E 320 BLUETEC one of the most economical vehicles in its class in the US. With the first four-cylinder BLUETEC model, Mercedes-Benz illustrates just how versatile this innovative technology can be.

BLUETEC is a DaimlerChrysler-developed technology designed to reduce diesel vehicle emissions, especially nitrogen oxides - the only exhaust-gas constituents that are still higher in today's diesel engines than they are in their petrol counterparts due to the principle involved. Mercedes-Benz is working intensively to optimize its engines and their combustion processes so as to minimize the nitrogen oxides before they are actually produced. In terms of "hardware", the sophisticated four-cylinder powerplant in the Vision C 220 BLUETEC, like the standard-production engines, includes four valves per cylinder, third-generation common-rail direct injection, a turbocharger with a variable nozzle turbine and exhaust gas recirculation. A highly sensitive electronic engine management unit reacts precisely to an extremely wide range of operating conditions and, in so doing, optimizes the combustion processes.

The BLUETEC technology in the Vision C 220 BLUETEC still includes an oxidizing catalytic converter, which reduces emissions of carbon monoxide (CO) and unburned hydrocarbons (HC), as well as a particulate filter. A modified NOx storage catalytic converter with a substantially extended service life, including patented on-board ammonia generation, is combined with an additional SCR catalytic converter to minimize nitrogen oxides. This process of exhaust-gas after treatment requires no additives.

The results are impressive whichever way you look at them: on the one hand, the concept car equipped with a 6-speed manual transmission consumes just 5.5 liters of diesel per hundred kilometers (NEDC); on the other hand, it delivers the same impressive output and torque figures while providing a unique combination of efficiency and driving enjoyment.

The standard-production version of the new C-Class, which celebrates its premiere at the Geneva Motor Show, is testament to the successful work performed by Mercedes-Benz in its quest to consistently reduce both fuel consumption and emissions. A lifecycle assessment carried out on the new Saloon, certified by the German technical inspection authorities (TÜV), confirms that the carbon dioxide (CO2) emissions for what is now the fourth generation C-Class have been reduced by 15 percent.

By way of example, the experts who performed the lifecycle assessment calculated that the total energy requirement of the new C-Class is 125 gigajoules lower than that of the previous model, equivalent to around 3800 liters of fuel. Since the year 2000, the carbon dioxide emissions have fallen by nine tons (15 percent) per vehicle. The reduction in exhaust-gas emissions is equally impressive: compared to the previous model produced in the year 2000, the sophisticated technology at the heart of the new C-Class cuts nitrogen oxide emissions by around 20 percent and hydrocarbons by twelve percent, according to the lifecycle assessment. Mean-while, particulate emissions from the diesel models have fallen by over 90 percent thanks to the fitting of a maintenance-free particulate filter as standard.

Source: Mercedes-Benz press

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