Cummins today announced that it will meet the 2007 US EPA on-highway Oxides of Nitrogen (NOx) emission standards using cooled-exhaust gas recirculation (cooled-EGR).

The decision marks the next stage in a process of evaluation that has seen the firm examine a range of different technologies that might help them meet the requirements of the government's emissions legislation.

To date the company has tested cooled-EGR, NOx adsorbers, selective catalytic reduction (SCR), as well as other aftertreatment technologies, ultimately determining that it would use cooled-EGR and particulate filters for the heavy-duty truck market.

Dr John Wall, Cummins vice president and chief technical officer, said the firm had built up a long history of experience in the area, adding that particulate aftertreatment filters would be crucial for any trucks meeting the 2007 requirements.

'Our experience with particulate filters and the availability of ultra-low-sulfur diesel fuel combine to give us confidence in meeting these tough standards,' said Wall.

Cummins has already utilized in-cylinder combustion technologies to meet the off-highway Tier 3 standards in the US.

Cummins also said it would be using SCR aftertreatment systems to meet Euro IV trucking emissions standards.