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2010 EMISSIONS
Did you know facts about UREA?
Look at the summer and winter maps for the United States. In the winter, 60% of the nation has average temperatures ranging from 20° F to below -10° F. This exposes urea to the condition that will cause it to freeze. In the summer, the situation is even more crucial, where 90% of the nation will experience average temperatures ranging from 80° F to above 110° F. This is the temperature range that can negatively impact the quality and shelf life of urea.
Facts: At 86°, urea has a shelf life of about 24 months. As the temperature increases to 95° F, the shelf life is reduced to 10 months. At 104° F, you are down to 4 months shelf life, and finally, if exposed to 140° F, there is only one week of shelf life.
Urea virtually becomes a second fuel in 2010.
As we approach the 2010 emissions regulations, there is much talk about SCR vs. EGR. To be clear, SCR is a solution that can reduce NOx with the use of additional after-treatment and the use of an additional fuel, urea. We think of urea as a fuel because without it the vehicle cannot run legally and will eventually lose power if the fluid is not available, rendering the vehicle useless to the customer. Although not final, EPA Vehicle Compliance requirements indicate vehicles will have to be equipped with sophisticated sensors to detect NOx in exhaust. If the sensors detect that there is a bad urea solution or no urea is available, there will be four progressive stages of warning and vehicle response.
1. With a low urea level, a warning light will appear which should be augmented by an audible warning.
2. The engine will de-rate and the driver will feel a power loss.
3. As the issue progresses, vehicle speed would be limited well below typical operating levels, say 15 MPH.
4. Finally, when the vehicle is shut down, there will be a no start condition.
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The use of SCR shifts emissions compliance from the manufacturer to the customer who must contend with maintaining the new after treatment system and a secondary fuel which has some undesirable characteristics when exposed to cold and heat.
For More Information Please Visit the Navistar 2010 Emissions Website or the Maxxforce Engine Website.
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