The Manufacturers of Emission Controls Association (MECA) has released a report providing an assessment of market-ready technologies being commercialized by suppliers of emission control and efficiency components for heavy-duty diesel vehicles to meet lower intermediate standards for oxides of nitrogen (NOx) by 2024 as a transition to final standards in 2027.
The report presents test results and emission models from fully aged after-treatment systems installed on heavy-duty on-road engines to offer several compliance paths that are achievable by model year 2024 without significant changes to today’s engines or after-treatment systems.
According to MECA, the report presents the following main conclusions:
• Several advanced technology options can be deployed on heavy-duty engines and vehicles to reduce NOx emissions by 75% below today’s heavy-duty FTP NOx standards while also meeting the 2024 heavy-duty Phase 2 greenhouse-gas limits and reducing the total cost of ownership of trucks.
• Strategies for reducing emissions during cold-start and low-load operation, combined with improved engine calibration and control of urea dosing, can be implemented to enable heavy-duty trucks to achieve an FTP NOx emission limit of 0.05 g/bhp-hr and a low-load cycle limit below 0.2 g/bhp-hr. These same technologies will deliver low-temperature NOx conversion in the real world as part of the newly proposed moving average windows-based compliance program.
• The cost of controlling NOx to 0.05 g/bhp-hr in 2024 and to 0.02 g/bhp-hr by 2027 will be less than the cost of emission control technology in 2010 because, over the past nine years, ingenuity and innovation have downsized emission controls by 60% and substantially lowered their cost.
“Both the U.S. EPA and the California ARB have announced rulemakings focused on strengthening the current heavy-duty emission standards. Getting to ultra-low NOx and greenhouse-gas emission levels will require a systems approach of advanced after-treatment technologies, efficient engines and clean fuels,” remarks MECA’s executive director, Rasto Brezny.
MECA has also put together a fact sheet on achieving low NOx emissions from heavy-duty trucks.
Founded in 1976, MECA is a nonprofit trade association comprising manufacturers of clean mobility technologies.