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SAE Paper 930131 outlined initial work performed on a diesel particulate filter system using a copper additive for regeneration. Laboratory evaluations of soot oxidation, fuel stability, and emissions reductions were presented along with preliminary field data. Since then, a total of thirty-four buses have been included in the North American fleet trials. The buses are powered by different engines and engine configurations. Results of the field trial are presented along with problems encountered and their resolution.

An earlier study (SAE Paper 920364) documented the ability of a Copper-based fuel additive to initiate regeneration of a particulate trap without external heat sources. Work performed with Southeastern Pennsylvania Transit Authority on diesel particulate filter systems for a 6V-92TA mechanical engine has been expanded to include 6V-92TA electronic, MAN and Caterpillar engines as well as an increased number of 6V-92TA mechanical engines. Both cordierite wall flow and fibre filter systems are currently being evaluated for performance and durability in field service. This paper outlines performance of the system which uses a copper-based fuel additive to induce regeneration along with emission reductions and health effects data. Additional data on compatibility of the copper fuel additive with typical commercial diesel fuels and lubricants is also presented.