DEF is a diluted mixture of 33 percent automotive grade urea and 66 percent de-ionized water, and is the key to making SCR engines work. It's imperative to monitor SCR engines' DEF levels because the engine cannot effectively reduce emissions unless it's filled to the appropriate level. This slightly affects maintenance, as it requires drivers regularly to refill the DEF tanks and mechanics to periodically replace the DEF filter.
statusreport Transportation 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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