California is looking to reduce NOx emissions from non-road engines by 90% and enforce particulate filters on all engines. Here is a summary of the latest workshop to get stakeholder feedback on Tier 5 standards.
Given the lack of MY 2024 compliant new engine introductions, California has proposed an amendment to its low NOx omnibus, providing more flexibility for legacy engines.
California and Truck & Engine Manufacturers have reached a deal on low NOx and electrification targets in the state. This paves the way for more regulatory certainty but the challenges ahead are not diminished.
Opposed piston engines are being developed as a tool to reduce CO2 and NOx emissions from heavy-duty trucks. Here’s a deeper look into this technology and recent test results.
Heavy-duty vehicles cover a very wide range of applications and typical driving profiles. A one-size-fits-all approach is unlikely to work for reaching zero tailpipe emissions from this sector. Here’s a summary of the application diversity from a US viewpoint.
Here’s a summary of California’s latest thinking on “Tier 5” tailpipe NOx emission standards for off-road construction and farming equipment.
This is part 1 of 2 technology updates on pathways to meet the low NOx standards for heavy-duty vehicles set by California and being considered by the EPA for nationwide implementation starting model year 2027.
Here’s a summary of EPA’s proposed changes to tailpipe NOx and CO2 emission standards for HD trucks in the US beyond 2027.
Here’s a summary of possible changes to emission standards for passenger cars being considered as part of Euro 7.
SuperTurbo with Turbine Bypass for Cold Start Aftertreatment Heating Upcoming regulations such as California’s Low NOx Omnibus and Euro VII will require >90% reductions in tailpipe NOx emissions from heavy-duty trucks. This is a series providing a summary of various technologies which can help meet these challenging regulations. What is a SuperTurbo? SuperTurbo is a driven turbocharger that has the capability of mechanically transferring power to and from the turbo shaft, enabling both compounding of excess turbine energy, as well as supercharging capability for improved transient response and greater control over charge flow. This supercharging capability also allows for a complete turbine bypass to be used during engine cold start, while still providing boosted airflow to the engine. For heavy duty diesel engines, this ability to supercharge during times of zero flow to the turbine is important to retain drivability and functionality of the engine. The turbine bypass directs the hot exhaust gasses directly to the aftertreatment, resulting in rapid heating of the aftertreatment during a cold start. See the end of this article for a short video which explains the bypass operation. Benefits for lower NOx emissions SCR inlet temperatures over cold WHTC cycle Preliminary testing of the SuperTurbo
