An Update on Continuing Progress Towards Heavy-Duty Low NOX and CO2 in 2027 and Beyond
2022-01-0669
03/29/2022
- Event
- Content
- Multiple areas in the U.S. continue to struggle with achieving air quality targets for ozone mandated by the U.S. EPA. These continued issues highlight the need for further reductions in NOX emission standards in multiple industry sectors, with heavy-duty on-highway engines being one of the most important areas to be addressed. Starting in 2014, CARB initiated a series of technical demonstration programs aimed at examining the feasibility of achieving up to a 90% reduction in tailpipe NOX, while at the same time maintaining a path towards GHG reductions that will be required as part of the Heavy-Duty Phase 2 GHG program. These programs culminated in the Stage 3 Low NOX program, which demonstrated Low NOX emissions while maintaining GHG emissions at levels comparable to the baseline engine. Previously, EPA has announced the intention to promulgate a national Heavy Duty Low NOX standard, and has since reaffirmed to need to release an updated Low NOX standard for heavy-duty on-highway vehicles that would be implemented in the 2027 model year. In support of that rulemaking effort, EPA has continued to support further Low NOX development efforts aimed at addressing areas where additional technical information and data would be needed for a national standard. In addition, EPA has continued efforts to examine and refine Low NOX technology approaches, building on the results of the previous CARB Stage 3 program. Some of these areas of additional work include refined system architectures and hardware, additional aging up to 800,000 miles to examine extended useful life, performance on real-world duty cycles, and in-use measurement performance and methods at Low NOX levels. This paper provides an update on the progress of these continued research and development efforts.
- Citation
- Sharp, C., "An Update on Continuing Progress Towards Heavy-Duty Low NOX and CO2 in 2027 and Beyond," SAE Technical Paper 2022-01-0669, 2022, .