The scandal of the emissions of Volkswagen, known as “dieselgate“, has not only been a blow for the German brand, but is also an ongoing threat to the rest of manufacturers.
In fact, other German such as BMW, Mercedes and Opel have been attacked by certain media outlets calling into question the low figures of emissions of some models equipped with mechanical diesel and have been quick to desmentirlo by means of press releases with data of measurements.
To the end of the last 2016, Mercedes has introduced a new engine strategy for the coming years, a new family of blocks that will be fitted across the range, from the Class up To the most powerful of the models AMG. And, taking advantage of that in September shall enter into force on the new cycle WLTP, along with the new procedure of measurement of Emissions from Actual Driving (RDE), Mercedes has resorted to the services of certification of the independent consultant DEKRA Automotive.
The experts of this consultancy have made measurements that confirmed a very low level of NOx emissions in the new engine four-cylinder diesel OM654 through an extensive program of tests on a Class, And 220d, which is the less powerful of this new block.
This program of dynamic testing focused on the Emissions of Actual Driving (RDE), doing tours in different routes through city areas, inter-city and road, with different temperatures between 2 and 16 and varying the number of passengers and the loading level. As Mercedes expected, the result of your E 220d has undermined the limit of the level of NOx emissions of 80 mg/km in all the tours performed according to the new measurement procedure RDE. In part, the NOx levels were even lower, between 21 and 13 mg/km to ambient temperatures lower.
These results have been achieved thanks to a new approach of integration of different technologies in the new block of four cylinders, a modular engine with different power levels that will be mounted on models of configuration, longitudinal and transverse, front wheel drive, rear and total, since the future Class up to the new generation of the Sprinter.
While all the blocks of gasoline will have a particulate filter in series, the diesel will have a new SCR catalyst, a new process of combustion, and an EGR that will carry out the treatment of gas directly in the engine, on the contrary that, until now, that occurred below the floor, increases the overall performance of the system.