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Five areas of test methods and equipment as used at The 3M Company Diesel Filter Products Laboratory are discussed. These include: 1. Diesel particulate sampling, 2. Data acquisition and process control, 3. Durability evaluation, 4. Exhaust gas flow rate measurement, and 5. Engine test benches. These methods and equipment, among others, enable performance and durability evaluation of diesel particulate traps.

Performance and durability tests were conducted on ceramic fiber-wound diesel particulate filters in the exhaust stream of both laboratory and in-service diesel engines. Metal-based additives were used to facilitate filter regeneration. Copper, iron and cerium additives were evaluated in laboratory tests for their effect on particulate filter performance and durability during tests totaling more than 3500 hours. Field data obtained on in-service vehicles validated and supplemented laboratory results. Effects of the additive on engine performance and durability are also presented.