ARB researchers evaluate in-use heavy-duty NOx aftertreatment systems, find elevated levels during certain lower-temperature operations
Green Car Congress
JULY 9, 2013
EGRs were primarily introduced for on-road heavy-duty diesel engines over a decade ago to meet the tighter MY 2004 NO x standard (2 g/bhp-hr). A certain minimum exhaust temperature is required in SCR to promote hydrolysis of urea into ammonia (NH 3 ) which then reduces NO x into nitrogen (N 2 ) and water (H 2 O). SCR system tampering.
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