Mercedes-Benz innovation: from diesel to BLUETEC: BLUETEC - the technology for the cleanest diesel in the world
Detroit, Jan 08, 2006 Mercedes-Benz is launching a unique initiative at the NAIAS 2006 in Detroit. The Stuttgart-based manufacturer with the world's longest diesel tradition is unveiling two vehicles that pave the way for an all-new diesel vehicle genera-tion: the E 320 BLUETEC and the Vision GL 320 BLUETEC. Mercedes-Benz has modified specific aspects of the economical, powerful and robust 320 CDI en-gine, adding state-of-the-art emission-control technology to make it the cleanest diesel in the world. Mercedes-Benz has thus transformed the diesel engine into a clean and future-compatible system. That system is called BLUETEC.
Offering its customers the very best has become something of a maxim at Mer-cedes Benz, not least when it comes to designing and constructing vehicles. This is especially true in the case of diesel, a drive technology which now accounts for more than 50 percent of the European market thanks mainly to the fact that it offers excellent economy, longevity and robustness without compromising on driving enjoyment. Economically state-of-the-art diesel vehicles from Mercedes-Benz are one answer to the unstoppable rise in fuel prices, including in the US.
Now, the brand's innovative BLUETEC technology makes the already economical diesel alternative cleaner than ever before. Mercedes-Benz was the first to implement Rudolf Diesel's combustion principle in a passenger car engine some 70 years ago. This technology is far more efficient than the gasoline engine and has been optimized over a period of many years.
One innova-tion in particular - the common-rail direct injection system in conjunction with four valves per cylinder introduced in 1997 - has had a major impact on the development of the modern diesel engine. Since then, the abbreviation CDI has come to stand for unsurpassed fuel economy and a major boost in torque - which means it has better pulling power and is more fun to drive, meaning that diesel vehicles are often superior to similarly powered gasoline models. If diesel models previously had any disadvantages compared to their gasoline counter-parts, then these related to specific diesel emissions, especially particulate matter and nitrogen oxides.
However, since the introduction of the maintenance-free particulate filter for its diesel passenger cars in autumn 2003, Mercedes-Benz has also brought about a substantial reduction in particulate matter. And although it has succeeded in cutting nitrogen oxide emissions by some 75 percent through engine modifications alone in the past 15 years, Mercedes-Benz wants to go even further still.
The objectives are clear: innovative exhaust gas aftertreatment methods give Mercedes Benz diesel engines the potential to comply with the world's most stringent emission standards and to be available in all 50 US states. In other words, Mercedes Benz will be able to offer the cleanest diesel in the world in every vehicle category. BLUETEC is the name for this new generation of high-tech diesel drives that will initially be launched in the US.
Today's Mercedes-Benz diesel engines also stand for agility, sportiness and reliability, as demonstrated before a world public last spring when three standard-specification E 320 CDI models broke a clutch of impressive records in Laredo (Texas). For one, a new average speed record of 224.823 km/h (139.699 mph) was set in a 30-day endur-ance test covering over 100,000 miles (160,934 km). These vehicles were also fitted with a sophisticated emission-control system, including a standard-specification main-tenance-free particulate filter. This meant that they were easily able to undercut the currently applicable EU 4 emission limits - a feat confirmed in the tests conducted by the TÜV (German technical inspection authority) following the grueling record-breaking drives.
The first BLUETEC vehicles available to customers in the US will be E 320 BLUETEC models, due for launch in autumn 2006. As well as delivering renowned economy, performance and reliability, these models comply with the world's most stringent emission standards.
Diesel has never been cleaner - thanks to BLUETEC
The world's most stringent nitrogen oxide limits - set by the US 50-state emissions standard - are just the type of challenge on which Mercedes-Benz thrives. The solution to this challenge is BLUETEC, a new generation of high-tech diesel systems which are the cleanest in the world in every vehicle category.
Mercedes-Benz is launching the BLUETEC initiative at the Detroit Motor Show. In addition to the world premiere of the brand new Mercedes-Benz GL-Class - a full-size SUV - the company is also presenting the GL 320 BLUETEC, a further vision for the future of diesel engines. With this latest concept vehicle, the Stuttgart-based car manufacturer proves that it is possible to combine excellent fuel economy and minimal emissions in every vehicle category, including full-size SUVs. The Vision GL 320 BLUETEC has a V6 diesel engine developing 155 kW/211 hp and 540 Nm torque. With this performance the expected consumption is 9.4 l/100 km (25 mpg). It is the most economical full-size SUV in the US, offer-ing a fuel saving of between 20 and 40 percent compared to gasoline engines with equal power rating.
Low-sulfur diesel fuel helps to reduce emissions
By the time the BLUETEC generation is launched in the US in autumn 2006, low-sulfur diesel with a maximum sulfur content of 15 ppm will be available, thus reduc-ing the previous upper limit of 500 ppm by a factor of 33. The US Environmental Protection Agency (EPA) has therefore laid the foundations for establishing sophisticated, fuel-efficient diesel vehicles in the US. This will result in a dramatic and immediate reduction in the emissions of all diesel vehicles in the US, representing a major step towards cutting emission levels in general. Sulfur, which occurs in mineral oil to varying degrees, has a corrosive effect in the engine as well as being a major cause of particulate matter. The introduction of a low-sulfur diesel fuel will enable the use of particulate filters and efficient nitrogen oxide aftertreatment.
BLUETEC - leading-edge drive system for the US
High torque and pulling power even at low engine speeds, impressive range and economic efficiency are decisive factors in the buying decisions of most motorists, including those in the US. Vehicles equipped with sophisticated diesel engines made by Mercedes-Benz are ideal for fulfilling these criteria, since they minimize fuel consumption while maximizing torque, range and driving enjoyment. In addition, they are extremely robust. Accompanied by innovative BLUETEC technology, this power-train has the potential to fulfill even the most stringent of emission requirements world-wide and specifically, in all 50 US states. Furthermore, it is ideally suited to the vehicle genres that are popular in the US such as large luxury sedans, SUVs, mini-vans, trucks and pickups. In addition, diesel really comes into its own in the traffic conditions that prevail in the US; steady cruising speeds on highways and long city-to-city distances.
This is even more important in a global situation in which energy and crude oil costs are expected to rise over the longer term. Diesel engines consume between 20 and 40 percent less fuel than their gasoline counterparts. In Western Europe, where fuel prices are double what they are in the US, a large number of motorists have already made the switch. More than half of European customers now opt for diesel passenger cars. As fuel prices continue to rise in the US over the longer term, fuel economy will become a more important criterion when buying a new car. This is why analysts ex-pect demand for clean diesel drive systems such as Mercedes-Benz BLUETEC to increase in the US, as in other countries. J.D. Power and Associates, a leading market research institute, forecasts that the market share for diesel passenger cars in the US, which currently stands at around 3.4 percent, will quadruple by the year 2015. Mercedes-Benz is convinced that, once BLUETEC technology has established itself, this forecast will appear conservative rather than optimistic.
Customers who opt for diesel models are especially appreciative of their excellent fuel consumption figures in real day-to-day driving conditions, which are very close to and sometimes even better than the officially quoted fuel consumption figures. One example of this was seen in a long-distance coast-to-coast fuel consumption test involving a Mercedes-Benz ML 320 CDI, carried out in the US by a German car magazine. On the route from New York to San Francisco, the all-wheel drive SUV consumed an average of just 9.2 liters per 100 km (equivalent to 25.6 mpg).
Diesel vehicles reduce dependence on oil imports
BLUETEC is not just the cleanest diesel technology in the world. It also ensures low fuel consumption in real terms, helping customers to make tangible fuel savings and, therefore, reducing the economy's dependence on oil imports. In the US, where there are concerns about ensuring fuel supplies over the longer term, this technology is set to play a key role, especially when one considers the fuel consumption advantages for the extremely popular SUVs and pickups (light trucks) which, as it stands, are pre-dominantly powered by large-displacement V8 gasoline engines.
Margo Oge, Head of the Office of Transportation and Air Quality at the US Environmental Protection Agency (EPA) presented the following figures back in March 2004: "If we had a light duty vehicle population that was one third diesels, that could save up to 1.4 million barrels of oil per day in the US, the amount of oil the US currently imports from Saudi Arabia. If we made these vehicles diesel hybrids, the oil savings would about double or up to 2 times the amount of oil Saudi Arabia ships to the US every day."
BLUETEC - the emission-control technology from Mercedes-Benz
The Mercedes-Benz development engineers have been advancing emission-control solutions for a number of years, one of the main aims being to ensure compliance with future emission standards in the US, Europe and Asia. One focus of these activities is devising effective and economical methods for reducing nitrogen oxides ("denoxing"). This technology for the cleanest diesel in the world is called BLUETEC.
In order to bring together all these technologies within a single, appropriate package, Mercedes-Benz is following a graduated plan that includes the following phases:
Optimization of the engines and their combustion processes to minimize untreated emissions. This includes electronic engine management, four valves per cylinder, third-generation common-rail direct injection with piezoelectric injectors, a turbocharger with variable nozzle turbine and exhaust gas recirculation.
Oxidizing catalytic converters to minimize emissions of carbon monoxide (CO) and unburned hydrocarbons (HC).
The particulate filter, fitted as standard in all Mercedes-Benz diesel cars in many countries since summer 2005, reduces particulate emissions by as much as 98 percent, thus easily undercutting even the current EU 4 particulate limits (0.025 g/km). This technology also ensures compliance with the US limits currently in force.
Nitrogen oxides - whose concentration is higher than in the exhaust gases of gasoline engines due to the specific combustion process in diesel engines - are reduced to such an extent that even the world's most stringent exhaust gas limits can be complied with. Here the so-called BLUETEC technology is utilised. This reduction is achieved either with an advanced DeNOx storage catalytic converter, available in the E 320 BLUETEC from autumn 2006, or with the more complex but even more effective AdBlue injection. This, combined with Selective Catalytic Reduction (SCR) creates the most effective method of exhaust gas aftertreatment currently available. This enables nitrogen oxide levels to be reduced by up to 80 percent. The Mercedes Benz engineers will be show-casing the combination with AdBlue injection in the Vision GL 320 BLUETEC at the Detroit show and are developing the process for use as a standard system in passenger cars.
The SCR process is based on the injection of the reducing agent AdBlue into the exhaust gas stream. AdBlue is an aqueous urea solution that is carried in a separate tank. Since an average of around 0.1 liters per 100 km (2352.15 mpg or 1 to 3 percent of diesel consumption) is all that is required, the tank can be designed so that it only needs to be refilled when service staff are carrying out regular, scheduled mainte-nance. When AdBlue is injected into the pre-cleaned exhaust gas, ammonia (NH3) is released, causing the nitrogen oxides to be converted into harmless nitrogen (and water) in a downstream catalytic converter. The decisive factor in ensuring that the catalytic converter works extremely efficiently is precise metering in line with the current engine operating state. Choosing which technological solution to use depends both on the vehicle concept concerned and on the required "denoxing" rate.
BLUETEC already a success in commercial vehicles
However, BLUETEC technology is not altogether new as, in Europe, it has already been employed extremely effectively in Mercedes-Benz commercial vehicles with a GVW above six tonnes. This technology has proved a resounding success in more than 10,000 vehicles such as the Actros, Axor and Atego trucks. In this case, BLUETEC reduces the nitrogen oxide levels considerably, meaning that these vehicles already comply with the emission standards due to come into force for trucks from 2009. In Europe the AdBlue supply network already comprises some 1,500 filling points.
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