Low CO2, Ultralow NOx Heavy Duty Diesel Engine: Experimental Results
2022-01-0511
03/29/2022
- Content
- This paper presents experimental results of a 10.6L, 3-cylinder opposed-piston (OP) operating on Diesel fuel designed for heavy duty (Class 8) operation. The paper will describe the engine configuration, and calibration of both catalyst light-off and high efficiency modes. Analysis based on measured results show the engine can comply with all 2027 California Air Resourced Board (CARB) and Environmental Protection Agency (EPA) requirements for CO2, and criteria emissions. Due to the ability of the OP engine to combine low NOx flux with high exhaust enthalpy for early catalyst light off, the engine can meet all future CARB NOx standards with a current, state of the art, but conventional underfloor aftertreatment system. Highlights of the results include: • Ability to meet all 2027 CARB ultralow NOx requirements with substantial margin, including Federal Test Procedure, Ramped Mode Cycle, the new low load cycle, and idle. • Ability to meet EPA 2027 GHG II CO2 limit of 432 g / bhp-hr on the Supplemental Emissions Test cycle with substantial margin. The 10.6L heavy duty engine was built and tested as part of the CARB-funded Heavy Duty Diesel Demonstration Program, culminating with in fleet use by Walmart in the summer of 2021. Taken together, the results show the potential of an OP engine to meet 2027 CARB and EPA regulations in a cost-effective and robust manner.
- Citation
- Salvi, A., Redon, F., Youngren, D., and Fromm, L., "Low CO2, Ultralow NOx Heavy Duty Diesel Engine: Experimental Results," SAE Technical Paper 2022-01-0511, 2022, .