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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 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.