Mercedes-Benz to Introduce the First Diesel Models With AdBlue Injection in
STUTTGART, GERMANY – Mercedes-Benz isdue to offer the R, ML, and GL 320 BlueTEC in the United States, the world’sfirst three diesel cars that not only meet the particularly demanding criteriaof the American Bin 5 standard, but also have the potential to fulfill thestringent EU6 standard due in the future, according to www.theautochannel.com.
Mercedes-Benzintroduced the E 320 BlueTEC with its in-house BlueTEC technology in America first, and is now including a variant of this BlueTEC technology with AdBlueinjection in its cross-Atlantic range. This innovative drive technology enablesthese large and powerful SUVs to meet the limits imposed by the US Bin 5standard.
Themuscular V-6 diesel engine powering the new BlueTEC models in the GL, M, andR-Class shows that a low fuel consumption and very low emissions are alsopossible for large SUVs. It has an output of 155 kW/211 hp and develops a torqueof 540 Nm. Fuel economy is outstanding: the GL 320 BlueTEC, for example,consumes just 9.5 liters of diesel fuel per 100 kilometers (25 mpg). Thisrepresents an advantage of around 20 to 40 percent versus a comparable petrolmodel, and makes the Mercedes-Benz GL 320 BlueTEC the most economical full-sizeSUV in the United States.
Certainfeatures of the six-cylinder diesel engine had to be modified for use in thenew models for ML 320 BlueTEC, GL 320 BlueTEC, and R 320 BlueTEC with AdBlueinjection. The piston crowns were revised for an improved mixture formation,and the compression ratio was reduced from 17.7 to 16.5. The VNT turbochargerand engine control unit were also improved and reconfigured. All three of thenew SUVs are available only with the 7G-TRONIC seven-speed automatictransmission, according to www.theautochannel.com.
As amodular concept for an effective reduction in the fuel consumption andemissions of diesel vehicles, the BlueTEC technology developed by Mercedes-Benzputs in place a number of coordinated measures that both minimize untreatedemissions using in-engine features and ensure efficient exhaust gasaftertreatment. All relevant emissions components are reduced to a minimum, inpart by using an oxidizing catalytic converter and a particulate filter. Themost important goal is to achieve a drastic reduction in nitrogen oxideemissions, the only exhaust gas constituent which has inherently higher levelsin diesel engines than in petrol engines.
In the E320 BlueTEC Saloon available in the United Statesand the E 300 BlueTEC sold in Europe, an oxidizingcatalytic converter and a particulate filter are combined with a particularlydurable NOx storage-type catalytic converter and a special SCR (SelectiveCatalytic Reduction) converter. The second BlueTEC version is used for the newGL 320 BlueTEC, ML 320 BlueTEC, and R 320 BlueTEC models. In this case, AdBlue,an aqueous urea solution, is injected into the stream of exhaust gases. Thisreleases ammonia, of which 80 percent is reduced to form harmless nitrogen andwater by the downstream SCR converter.