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An electrically regenerable diesel particulate filter particularly suitable for small (less than 4.0 liters) diesel engines has been developed. The cartridge consists of a unique tubular heater which is wrapped with ceramic fibers. Two or more of these cartridges with integral heaters are used in building a diesel particulate filter system. The features of this cartridge are described along with performance results. Performance and durability data are presented under both steady state and transient operating conditions. System design using these cartridges in a forklift truck application is presented in this paper. Performance and durability data of the system is discussed.

The development and test results of several unique fiber wound diesel particulate filter cartridges are discussed. Included in the discussion are material properties of the continuous, textile grade, high temperature fibers and the preparation of these fibers into a suitable construction to be used for diesel exhaust filtration. Design considerations for the various particulate filter cartridges will be explained with corresponding performance results. Compatibility with various regeneration methods will be addressed. Test data with electrical and fuel burner regeneration will be highlighted. A description of system concepts utilizing these diesel particulate filter cartridges will be outlined. The status of limited field experience with various filter designs in a variety of applications will be shown.

A woven fiber Diesel particulate filter has been developed which demonstrates good low-mileage soot-trapping and regeneration efficiencies. The fiber filters are wound around electric heating elements, which provide uniform energy in close proximity to the soot-laden fiber during regeneration. The filters are loaded with particulate to a target backpressure and energized one at a time with intermittent particulate loading to the target backpressure between successive filter regenerations. These design features were utilized to help minimize regeneration power requirements, and maximize mileage accumulation between regenerations. Regenerations are performed with unbypassed exhaust flow and can be accomplished under high vehicle speed operation as well as under idle conditions. The passenger car system contains four filters which are approximately 20 inches long and 3.0 inches in diameter.