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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.

Recently, 3000 catalytic purifiers have been sold into Santiago, Chile, for use on urban buses. The sale into Santiago resulted from over two years of demonstrating the performance of diesel catalytic purifiers in various Latin American countries. This paper highlights the results of the demonstrations including a variety of engine-types, opacity reductions provided by the use of purifiers, preliminary durability data and the present status of the use of catalytic technology in Latin America.

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.

A series of demonstration programs have been carried out over the last three years to determine the efficiency and performance of diesel catalytic converters on urban buses for smoke and gaseous emissions reductions. Some of these studies and results were outlined last year in an SAE Paper No. 930132. This paper highlights the final results of the demonstration programs including the gaseous emissions and opacity reductions achieved on various types of diesel powered engines by using diesel catalytic converters. Also included in this paper is durability data obtained on the converters during these demonstrations.

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.