Report: The Feasibility of Heavy-Duty Diesel Trucks to Meet 2024 NOx Standards


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.

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Steve Lund
Steve Lund
1 year ago

Interesting article and essential information for the health of the planet. Amazingly, on the same page is a flyer about the very engine that ALREADY provides the requirements mentioned. Both the Cummins Westport L9N engine and the ISX12N engine are Zero Emission engines that satisfy Emission Requirements until 2030. The use of Renewable Natural Gas (RNG) satisfies Emission Requirements beyond 2030. These engines are commercially available NOW. The L9N engine is a spark plug ignited engine that is used in smaller delivery trucks, garbage trucks, and buses. The ISX12N engine allows the use of EXISTING 18 wheeler engines to be… Read more »