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A cooperative R&D program involving Engine Control Systems Ltd. (ECS) and Consolidated Freightways, Inc. (C-F) has resulted in a diesel emissions control system for small to medium sized mechanical handling equipment. This paper outlines the design specifics of the system with an emphasis on the manner in which forktrucks can relatively easily be retrofitted. Both laboratory and in-field test results are outlined. The particulate filter system uses electric power to induce regeneration when backpressure rises to unacceptable levels.

Several previous SAE papers have discussed the direct on-line soot measurement device that uses radio frequency (RF) technology to measure filter soot loads in diesel particulate filters. This paper presents differential pressure measurement data from several different retrofit vehicle applications using various filter geometries. This data is discussed and correlated to laboratory test results. The durability of the system to urban buses is also outlined.

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 underground demonstration of prototype diesel particulate filters (DPF's) for heavy duty production vehicles was undertaken from 1987 through 1989 at Brunswick Mining and Smelting No. 12 mine in Bathurst, New Brunswick. The trial has indicated that the DPF's substantially improved the underground air quality and can reduce nuisance maintenance due to engine smoke. The trial included load-haul-dump vehicles equipped with both Caterpillar and Deutz engines, underground dump trucks with Deutz engines and bulldozers with Caterpillar engines. One filter logged over 4,000 hours of operation and it appears that the durability is adequate. Details of the demonstration are presented within this paper.