Meeting 2010 Emissions Standards by ProQuest

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                                  ANNUAL TRUCK REPORT




Meeting 2010 Emissions Standards
To comply with EPA regulations, manufacturers roll out more efficient engines. By Elise Schafer


I  n January 2010 the EPA rolled out its lat-
   est version of the National Ambient Air
Quality Standard (NAAQS) for nitrogen diox-
ide (NO2). The regulation states that nitrogen
oxide (NOx) emissions must be reduced by
85 percent from the current level, resulting
in a cumulative NOx reduction of 99 percent
from 1974 levels.
   New engine technology is helping vehicles
achieve the 2010 standard. Companies plan-
ning to purchase new trucks in the next
year will have to make a decision about what
engine technology will meet their needs.
While many new engine options lower emis-
sions to the required levels, they work differ-
ently and have various advantages.

NOx And EPA 2010
   NOx is a generic term for oxides of nitro-
gen. These oxides are produced in the cyl-
inder of an engine during high temperatures
of combustion. The EPA states that reducing
NOx emissions from heavy duty engines will
protect public health, especially of sensitive
populations, such as people with asthma,
children and the elderly.                         START YOUR ENGINES: Companies planning to purchase trucks in the next year will
   The EPA has been steadily ramping up its       have to make a decision about what engine technology will meet their needs.
engine emissions standards for the past 12
years, enforcing new standards in 1998, 2004      and similar legislation in Europe and Japan         over time under the medium-duty cycle our
and 2007, with EPA 2010 being the strictest       will follow.”                                       users put them through.”
to date. Thanks to the industry’s compliance                                                             SCR involves injecting diesel exhaust fluid
with these standards, by the end of 2010 die-     SCR Technology                                      (DEF) into the hot exhaust stream after the
sel emissions will be reduced by 97 percent          Most all of the industry’s mainstream truck      diesel particulate filter (DPF) and before it
from 1988.                                        manufacturers, such as Isuzu and Kenworth           reaches the SCR catalyst, a new component
   In anticipation for EPA 2010, truck man-       Truck Co., Louisville, KY, have chosen to use       in Isuzu engines. The heat of the exhaust gas
ufacturers have been working for years            Selective Catalytic Reduction (SCR) technol-        turns DEF into ammonia gas, water vapor
toward a solution for their engines to meet       ogy in their engines to meet EPA 2010.              and carbon dioxide when it is injected into
the new regulation, among other standards            “We analyzed several different technolo-         exhaust system. Inside of the SCR catalyst,
worldwide.                                        gies, including massive EGR, combustion tun-        ammonia gas reduces the NOx found in the
   “We have an advanced technologies grou
								
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