Mercedes details all-aluminum 2.0-liter diesel for E 220d
The new four-cylinder diesel OM 654 marks the start of a pioneering family of engines at Mercedes-Benz. Exemplary efficiency and emission values make the premium diesel for the future and emphasize the central role played by the diesel drive upon reaching the ambitious global climate targets. Its world premiere, the first all-aluminum four-cylinder diesel from Mercedes-Benz E 220 d in the new E-Class in spring 2016th
"In the new engine family infected over 80 years of diesel expertise of Mercedes-Benz. The new premium diesel is more economical and more powerful, lighter and more compact - and they are designed to meet all future emission regulations worldwide, "says Prof. Dr. Thomas Weber, Daimler Board Member for Group Research and Head of Mercedes-Benz Cars Development. "In our view, diesel engines in trucks and cars indispensable if the transport-related CO2 emissions will continue to decline."
In the roadmap for sustainable mobility optimization of modern combustion engines in addition to hybrid and electric vehicles plays a crucial role at Mercedes-Benz. In particular, the economic, clean and especially in Europe very popular diesel makes a significant contribution to a further reduction in fleet consumption. Mercedes-Benz is well on its way. In two decades since 1995, the average consumption of the car fleet decreased from 9.2 l / 100 km (230 g CO2 / km) to 5.0 liters (125 g CO2 / km) by almost half. Even today emit 68 models of Mercedes-Benz Cars under 120 g / km. And 108 models carry the efficiency label A + or A.
The engine family modular is used widely across the portfolio of Mercedes-Benz Cars and Vans. Planned are several power levels and longitudinal and transverse installation in vehicles with front, rear and all-wheel drive. This also makes the new development so significant because the improvements in efficiency thus have a direct impact on the fleet consumption of Mercedes-Benz.
The objective of our new generation of engines it was also to reduce the number of variants as far as possible. The compact dimensions of the engine allow more flexibility in adapting to different vehicle types. Series Across the interfaces between the drive unit and vehicle were unified. In particular, all the elements of the exhaust gas aftertreatment are now positioned directly on the engine, not the vehicle. Making its world debut of the new four-cylinder OM 654 than 220 d in the new E-Class in spring 2016. The bottom line increased power available at the new engine around 13 percent less fuel consumption and CO2 emissions at the same time again (143 kW instead of 125 kW).
The main innovation of the new engine:
- For the first time, all-aluminum four-cylinder diesel in
- Steel pistons with stages wells combustion process, NANOSLIDE® cylinder coating, common rail of the fourth generation
- Arrangement of all emission control technologies directly to the motor
- Significantly lighter and more compact: 168.4 kg vs. 202.8 kg (-17%), two-liter displacement takes 2.15 liters, cylinder spacing 90 mm vs. 94 mm
- Lower noise level and top vibration comfort through a variety of measures
Exhaust emissions:
Prepared for the future The new diesel engine is to meet the future emission legislation (RDE - Real Driving emission) designed. The WLTP cycle (Worldwide harmonized Light vehicles Test Procedure) has over the current NEDC measuring cycle to the destination that the values for standard and real consumption are close to each other in the future. In addition, a measurement method for the Real Driving Emissions (RDE) to be introduced in Europe, which is also actively supported by Mercedes-Benz.
All information relevant for the efficient emission control components are mounted directly on the engine. Supported by insulation measures and improved catalyst coatings can be a motor-side temperature management in the cold start and low-load operation completely omitted. Besides the benefits of emissions arise from fuel savings especially for short distances. By close-coupled arrangement, the exhaust aftertreatment has a low heat loss and optimum working conditions. The new engine has a multi-way exhaust gas recirculation (EGR). Combining the cooled high-pressure and low-pressure EGR. Thus, the raw emissions of the engine in the entire map may already be further lowered significantly at optimum fuel efficiency position of the combustion center of gravity.
The exhaust gas from the turbocharger first enters a diesel oxidation catalyst. It happens more the downdraft mixer in which the AdBlue liquid is mixed with the aid of a water-cooled metering module. Through a specially developed mixing section succeeds in the AdBlue fluid to evaporate the shortest route in the exhaust stream and to distribute very uniformly on the surface of the following SDPF (particulate filter with coating for the reduction of nitrogen oxides). Behind the SDPF is still a SCR catalyst disposed for further catalytic reduction of the nitrogen oxides. Only after that the cleaned exhaust gas enters the exhaust system.