The Slippery Task of Defining Sustainability
Hybrid Technologies to Produce Electric Version of Mullen GT

Cummins Diesels Ready for 2007 Emissions Standards

Cummins Inc. announced the readiness of its on-highway engine product line to meet the US Environmental Protection Agency (EPA) and California Air Resources Board (CARB) emissions standards for 2007.

Cummins will continue to use its cooled Exhaust Gas Recirculation (EGR) technology with the addition of exhaust aftertreatment provided by the integrated Cummins Particulate Filter and a crankcase ventilation system.

(The EPA 2007 regulations eliminate an earlier exception for crankcase emission control for turbocharged heavy-duty diesel engines. Crankcase emissions from these engines are now included in the emissions load.)

This technology is consistent on all Cummins on-highway diesel engines for North America, including the Heavy-Duty ISX and ISM, as well as the MidRange ISL, ISC and ISB engines.

The entire line features fully integrated electronic controls, with a single ECM (Electronic Control Module) that controls the engine and aftertreatment. All engines will use the patented sliding-nozzle Variable Geometry Turbocharger (VG Turbo), which features an electric actuator for 2007 with faster response and improved precision in adjusting airflow to the engine.

The Cummins Particulate Filter includes a diesel oxidation catalyst (DOC) and a diesel particulate filter to reduce particulate matter by 90%. The DOC fully optimizes the regeneration capability of the particulate filter, a critical aspect for maintaining fuel economy comparable to current engines. The crankcase ventilation system features a Fleetguard coalescing filter, which captures and filters crankcase emissions, and returns oil directly to the sump.


Mark A

I guess the Chevy Duramax and the Ford powerstroke, in the medium heavy markets, need to play catch up.

Will this apply to the Jeep Liberty diesel (which could be a precursor to Jeep making the Gladiator)?


Mark - the Jeep Liberty is regulated under the light-duty regs (Tier 2), not these 2007 heavy-duty regs. The heavy-duty emissions are regulated by grams/hp-hr, while the light-duty emissions are regulated by grams/mile, so it is difficult to directly compare the two.

It is my understanding that the 2010 heavy-duty emission regs will be roughly equivalent to the Tier 2, Bin 5 standard for light-duty vehicles.

Mark A

Does the current Liberty diesel meet the current Tier 2 light-duty regs, and future regs.

Correct me if I am wrong as I am not fully informed on the upcoming diesel regs, as I do not currently drive a diesel.


I believe the Liberty diesel is Bin 10. Bins 9 & 10 are scheduled to be deleted at the end of this model year (2006). See for more information. So the Liberty diesel currently does not meet the future Tier 2 emission requirement.


International Engines, the maker of the Power Stroke Diesel has had this technology ready since 2001 - it only took them ONE year to develop... Cummins was the one playing catch up.

The comments to this entry are closed.