MERCEDES-BENZ BLUETEC®

							                    MERCEDES-BENZ BLUETEC ®
                          DESIGNED TO RUN ON THE LOW SULPHUR DIESEL FUEL (15 PPM)
                                           AVAILABLE IN CANADA

ENVIRONMENTAL BENEFITS OF A DIESEL                                                    BLUETEC® PROCESS

EXHAUST AFTER-TREATMENT SYSTEM
                                                                                              STAGE 1
  •   Reduces harmful exhaust levels of nitrogen oxide
  •   Allows diesel engines to meet emission                       Exhaust emissions from the diesel engine enter the diesel
      standards                                                    oxidation catalyst to reduce the amount of carbon
  •   Eliminates particulate matter and soot                       monoxide (CO) and unburned hydrocarbons (HC).

                                                                                              STAGE 2
The ecoTECHNOLOGY for Vehicles (eTV) program received
the Mercedes-Benz BlueTec® exhaust treatment system as a           Emissions are processed through an advanced NOx storage
donation from Mercedes-Benz Canada, for use in demonstrating       catalyst (NSC). Nitrogen oxide emissions are stored during
how the latest generation of advanced exhaust after-treatment      periods of lean engine operation, cycled for approximately
technologies can help diesel engines to meet stringent Canadian    120 to 180 seconds. Regeneration of the catalyst is
emission standards. The display includes an oxidizing catalytic    accomplished by changing the engine fuel-air ratio to a richer
converter connected directly to a nitrogen oxide (NOx) storage     operating condition. The regeneration cycle lasts for
catalyst. Exhaust piping then connects the diesel particulate      approximately 2 to 4 seconds, releasing ammonia into the
filter to the selective catalytic converter (SCR).                 exhaust.
The BlueTec® exhaust treatment system was designed for the                                    STAGE 3
reduction of nitrogen oxides and diesel particulate matter that
are by-products of an efficient diesel engine process. BlueTec®    A diesel particulate filter traps the particulate matter and soot.
is based on a combination of engine-design measures that           As soot is filtered, pressure sensors at the inlet and exit of the
lower particulate emissions, coupled with a further reduction of   filter detect changes in pressure, notifying the engine control
nitrogen oxides downstream of the engine.                          unit that the filter is full and to increase the exhaust
                                                                   temperature. The hot exhaust purges the filter in pulses lasting
Although diesel particulate matter, soot and smoke can be          approximately 2 to 4 seconds, burning off the soot. These
managed with advanced particulate filters and higher fuel
                                                                   pulses will last for several minutes.
injection pressures, Canadian emission regulations are
designed to ensure a reduction in the level of nitrogen oxides.                               STAGE 4
BlueTec® limits nitrogen oxide emissions with the use of a
storage catalyst and an SCR converter.                             Ammonia from the NSC is stored in an SCR converter. The
                                                                   stored ammonia reacts with the catalyst, removing the
eTV is evaluating this technology in partnership with Mercedes-    remaining NOx emissions. The final by-products are nitrogen
Benz Canada. As well, eTV is researching similar exhaust           and water vapour, gases that occur naturally in the air.
after-treatment systems through partnerships with the
National Research Council of Canada.                                              eTV FLEET INFORMATION

                                                                   Date Acquired        February 2008
         The eTV program is exploring how advanced                 Current Status       Showcasing technology
         technologies can help create a sustainable
         transportation system for Canadians.                      www.tc.gc.ca/eTV