Modern Mercedes-Benz BlueTEC engines work as well-oiled machines, using complex components like high-pressure fuel injection and variable-vane turbo to create more powerful combustion, which is where the incredible low-end torque originates. When AdBlue is injected into the exhaust, the substance converts nitrogen oxide emissions into harmless nitrogen and oxygen, emitting very little detrimental gas.
As diesel-powered vehicles continue to grow in popularity, look for more Mercedes-Benz BlueTEC vehicles in the future. Open Today! Sales: 9am-6pm. Service: 7am-6pm. Parts: 7am-6pm. Look for this link on your favorites: Save. Schedule Service. Contact Service.
Mercedes Benz of Kansas City. Find Your Vehicle Close. Search By Keyword Search:. With this design, NOx gasses produced under normal operation are trapped and temporarily held in the converter. At prescribed intervals, under the direction of the onboard computer, the fuel system delivers intermittent rich combustion phases.
The entrained excess hydrocarbons from this dense mixture recombine with the trapped oxides of nitrogen inside the hot housing and break-up the NOx molecules. The resulting clean nitrogen gasses and water vapor are purged, leaving behind a clean converter with regenerated catalysts that are ready to accept the next wave of nitrogen oxides.
Mercedes-Benz designed this process for their larger and heavier line of SUVs and their R-series crossover, following the logic that these vehicles already have a higher rate of fuel consumption and that they would be more economical using a system that does not rely on frequent fuel-consuming rich mixture events for NOx abatement. While the storage-type system does allow Mercedes to use a more-or-less out-of-the-box CRD engine , this Selective Catalytic Reduction SCR arrangement did require some changes to the engine design.
Among those modifications: revised piston crowns for better fuel distribution and atomization, slightly reduced compression ratio and a more adaptive Variable Geometry Turbocharger VGT to a give smoother and flatter torque curve. Whereas the storage device uses excess shots of rich fuel mixture to "burn-off" accumulated nitrogen oxides, this injection process relies on chemical conversion via a reaction between the AdBlue urea solution and the accumulated NOx molecules within the SCR converter.
When AdBlue is injected into the hot exhaust steam, it is reduced to water and urea. At a temperature of about degrees Fahrenheit Celsius , the urea reforms into ammonia NH3 which then reacts with NOx gasses in the converter to produce benign nitrogen gas and water vapor. Which of the two systems is applied to any particular vehicle depends primarily on the vehicle's intended use: Heavy, high fuel consumption SUVs that spend a good deal of time under load are best served by AdBlue injection.
On the other hand, smaller fuel-efficient passenger cars that are, by and large, passenger moving cruisers, make optimal use of the NOx storage converter. Actively scan device characteristics for identification. Use precise geolocation data. Select personalised content. Create a personalised content profile. Measure ad performance. Select basic ads. Create a personalised ads profile.
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