Meeting Future NOx Emissions Over Various Cycles Using a Fuel Burner and Conventional Aftertreatment System
2022-01-0653
03/29/2022
- Content
- The commercial vehicle industry continues to move in the direction of improving brake thermal efficiency while meeting more stringent diesel engine emission requirements. This study focused on demonstrating future emissions by using an exhaust burner upstream of a conventional aftertreatment system. This work highlights system results over the low load cycle (LLC) and many other pertinent cycles (New York Bus Cycle, Orange County Transit Authority Cycle, Beverage Cycle, and Stay Hot Cycle). These efforts complement previous works showing system performance over the Heavy-Duty FTP and World Harmonized Transient Cycle (WHTC). The exhaust burner is used to raise and maintain the Selective Catalytic Reduction (SCR) catalyst at its optimal temperature over these cycles for efficient NOx reduction. This work showed that tailpipe NOx is significantly improved over these cycles with the exhaust burner. In certain cases, the improvements resulted in tailpipe NOx values well below the adopted 2027 LLC NOx standard of 0.05 g/hp-hr, providing significant margin. In fact, near zero NOx was measured on some of these cycles. However, burner operation on the tested cycles also resulted in a CO2 increase. On the beverage cycle, for example, the CO2 increased by as much as 13% and indicates that utilizing the burner may require additional technologies and/or calibration strategies to achieve improved CO2 results.
- Citation
- McCarthy, Jr., J., Matheaus, A., Zavala, B., Sharp, C. et al., "Meeting Future NOx Emissions Over Various Cycles Using a Fuel Burner and Conventional Aftertreatment System," SAE Technical Paper 2022-01-0653, 2022, .