Meeting future NOX emissions using an electric heater in an advanced aftertreatment system

Engine and aftertreatment solutions are being identified to meet the upcoming ultra-low NO x regulations on heavy duty vehicles as published by California Air Resources Board (CARB) proposed United States Environmental Protection Agency (US EPA) for year 2027 beyond. These standards will require changes current conventional systems dealing with low exhaust temperature scenarios. One approach meeting this challenge is supply additional heat from engine; however, comes a fuel penalty which not attractive encourages other options. Another method external generated directly system. The following work focuses later maintaining production engine calibration coupling an Electric Heater (EH) upstream of Light-Off Selective Catalytic Reduction (LO-SCR) followed primary system containing downstream (SCR). External supplied using EH reduce Tailpipe (TP) emissions minimal penalty. Two configurations have been implemented, first Close Coupled (CC) LO-SCR configuration second Underfloor (UF) configuration. CC shows best outcome it closer engine, helping achieve required lower power while UF addresses real-world packaging options LO-SCR. This that 7 kW LO-SCR, in absence heated Diesel Exhaust Fluid (DEF), met regulatory limit. It also sub-6-inch diameter negligible pressure drop can be easily packaged into future