New generation of motors. State-of-the-art diesel technology from the A- to the S-Class

Following the launch of the new generation of diesel engines in the E-Class (four-cylinder OM 654) and the S-Class (six-cylinder OM 656), the four-cylinder OM 608 is being introduced in May in the new A-Class. The new diesel engines from Mercedes-Benz are therefore now available from the compact class to the large, luxury class.

Current Mercedes-Benz vehicles equipped with the latest diesel technology can achieve NOx emissions in a very low double-digit and sometimes even single-digit range under the conditions of some Real Driving Emissions (RDE)-measurements on the road. For instance, the technical inspection company TÜV Hessen tested a wagon version of the new C-Class with a new 1.6-liter four-cylinder OM 654 engine according to the currently applicable RDE regulations, and measured nitrogen-oxide emissions below 10 milligrams per kilometer in the overall cycle, both with and without cold starts. When a sedan version of the new C-Class with the same engine was tested in accordance with the RDE method, NOx emissions of approximately 10 milligrams per kilometer were measured.

However, average emissions over many thousands of kilometers under different conditions are much more meaningful than individual measurements. Mercedes-Benz diesel engines of the new generation (OM 654, OM 656 and OM 608) already achieve average NOx emissions of about 40 to 60 milligrams per kilometer on RDE journeys – also in city traffic. These NOx emissions are thus well below the current RDE limit of 168 mg/km and even below the laboratory limit of 80 mg/km. Organizations such as, for example, Dekra, TÜV or auto magazines have confirmed that very good results are achieved in road tests.

As is already the case with the OM 654 and OM 656, the OM 608 engine features a compact exhaust-gas aftertreatment system close to the engine as well as multiple exhaust gas recirculation (EGR) with high- and low-pressure EGR, which ensures that average nitrogen-oxide emissions are significantly below the current legal limits of the new RDE test method. For the first time, this model series also features an SCR catalyst with AdBlue® exhaust fluid.

In the A180d with 7G-DCT dual-clutch transmission the new diesel engine performs 85 kW (116PS) and achieves a maximum torque of 260Nm (fuel consumption combined: 4,5-4,1 l/100 km combined CO2 emissions: 118-108 g/km).

Mercedes-Benz’s new generation of engines already demonstrated two years ago, how the NOx-challenge in Diesel cars can be solved technically. We are fully committed to modern diesel engines as part of the drive mix for the future.

30 models and 200 variants by September 2018

In the coming months, many more Mercedes-Benz models will be launched that are certified in accordance with Euro 6d-TEMP. By September 2018, more than 30 of the currently available models and more than 200 variants are to be changed over to Euro 6d-TEMP Norm (RDE Stage 1) – a full year before this is mandatory for all vehicles. Mercedes-Benz customers will therefore have an ever increasing range of such vehicles to choose from in the coming months.

Mercedes-Benz has already had the crucial innovations in the further development of diesel technology in series-produced cars for two years now. The four-cylinder diesel engine OM 654 with a combination of exhaust-gas aftertreatment close to the engine, stepped combustion bowls and further developed multiple exhaust gas recirculation was already introduced in the Mercedes-Benz E-Class in April 2016. Since then, Mercedes-Benz has systematically adapted its product portfolio to the new generation of diesel engines. For that purpose, the company has invested approximately three billion euros in research and production.

The new engines still have the potential for technical improvements: “We have already achieved enormous progress, but our engineers are of course developing the technology even further,” continues Ola Källenius. “Our goal is to arrive at average NOx emissions of around 30 milligrams per kilometer in RDE Stage 2 tests by 2020. And we are determined to achieve averages approaching 20 milligrams in the following years. We are targeting these figures in particular for our vehicles on RDE driving tests in cities.” One of the levers is the continuous improvement of the interaction of the various components in the overall system – which includes the highly complex engine-management system. On the other hand, further developed technology will also be applied in the coming years.

One of the levers is the continuous improvement of the interaction of the various components in the overall system – which includes the highly complex engine-management system. On the other hand, further developed technology will also be applied in the coming years.

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