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Cummins Ready for Phase 2 of Greenhouse Gas (GHG) Regulations

Cummins has consistently been the industry leader in the development of cleaner-running, more fuel-efficient engines, reducing diesel emissions by 99 percent over the past 30 years. Cummins was among the first engine manufacturers to meet U.S. Environmental Protection Agency (EPA) standards in 2002, 2007, 2010 and again in 2013 (a year ahead of schedule) with Phase 1 greenhouse gas (GHG) and fuel-efficiency (FE) regulations.

The implementation of Phase 1 GHG and FE regulations has proven to be a win/win proposition for Cummins, our customers and the public at large. Technological advances such as combustion optimization, reduced parasitic losses, enhanced downspeeding capabilities and the Cummins aftertreatment system have resulted in a product that gets better performance and better fuel economy at near-zero emission levels.

Now our efforts are focused on meeting Phase 2 of the regulations from the EPA and the U.S. Department of Transportation (DOT), set to take effect in three stages from 2021 to 2027.

In addition to maintaining near-zero emission levels of oxides of nitrogen (NOx) and particulate matter (PM), engine manufacturers also need to control carbon dioxide (CO2) and other greenhouse gases. By 2027, medium-duty vocational engines will need to show a 7.1 percent reduction in CO2 emissions, and heavy-duty tractor engines will be required to achieve a 6.1 percent reduction in Phase 2 compared with Phase 1 2017 standards.

The good news is that reduced CO2 emissions translate to fuel savings for your customer and the new regulations can be achieved utilizing technology that is currently in development. Further combustion improvements, more efficient air handling, friction reduction, lower parasitic losses, high-efficiency aftertreatment and waste heat recovery are just some of the methods Cummins is already exploring.

Cummins is confident we have the technologies to meet or exceed the required engine improvements while improving driver experience with the development of integrated systems such as the Cummins and Eaton® SmartAdvantage Powertrain. Not only do they reduce fuel consumption in every engine, but they help eliminate driver variation through the use of Automated Manual Transmissions.

This powertrain management, together with ADEPT™ and Cummins Connected Solutions,™ ensure not just better fuel economy, but superior drivability, productivity and reliability for years to come.

The Air Resource Board (ARB) is also expected to adopt Phase 2, which would result in harmonized regulation across all 50 states. For more information on Cummins fuel-efficient engines for heavy- and medium-duty trucks, visit

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