Bosch has announced that it is to begin series production of particulate filters for diesel-run vehicles during 2005.

The announcement confirms that the company does intend to capitalise on the Environmental Protection Agency's Tier 2 emission regulations, which are to be phased in between 2004 and 2009.

The Bosch diesel particulate filters will use sintered metal substrates, which are different from the industry-standard ceramic wall-flow monoliths.

The company will work on two regeneration models for the filters, one to be used with fuel additives and the other with a catalytic coating.

Hot exhaust gases will regenerate the filter in both cases, by oxidising deposited carbonaceous particles. The filters will be designed to accommodate space for ash deposits collected over a vehicles normal lifetime, and will not require servicing or replacement.

Bosch expects particulate filter sales to reach six million each year by 2007, as vehicle manufacturers will need them to comply with EPA Tier 2 standards on diesel cars and light trucks. The company has earmarked $223 million to be used on development and production equipment.