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EGR vs SCR * USA - Navistar: Scrap current '10 engine rule; recall SCR trucks
As rivals often point out, while Navistar criticizes SCR systems' ability to comply with the 2010 standards, it does not yet have an engine that meets the EPA's 2010 NOx limit
Washington,DC,USA -Today's Trucking -2 Sept 2010: ... Navistar is now calling on the agency to force a recall of those engines currently in the market and introduce a new guidance that requires SCR engines to shut down immediately when out of diesel exhaust fluid (DEF)... A new rule should require SCR engines to employ sensors that "immediately" recognize the difference between proper DEF and the wrong fluid or an empty DEF tank, the company urges... At the meeting, in which competitors Daimler Trucks, Volvo and Cummins begrudgingly observed, Navistar demanded that regulators fix "loopholes" which allow trucks to continue operating in a derated mode if DEF runs out or is substituted with another liquid... In a video demonstration, Navistar showed that some trucks can operate without DEF for extended periods and freely driven up to 11,000 miles with water in place of DEF, thereby "illegally" relaxing -- Navistar claims -- the agency's own 0.20g NOx standard... SCR competitors counter that the demonstration is misleading since, in actuality, sensors would identify the NOx limits being breached and the system would initiate a derating "inducement," which would eventually shut the truck down at the next fuel fill-up interval... (Photo: SCR engine -left- and Navistar's MaxForce EGR engine -right-)Labels: EGR, EGR vs SCR, SCR selective catalyst reduction
posted by Unknown @ 4:08 AM
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