ARB Research Seminar

This page updated July 25, 2013

Electric Diesel Particulate Filter Demonstration

Photo of Bradley Edgar, Ph.D., Michael Streichsbier, Ph.D. and Tom Swenson

Brad Edgar, Ph. D., Michael Streichsbier, Ph.D. and Tom Swenson of Cleaire Advanced Emission Controlls, LLC

August 31, 2006
Cal EPA Headquarters, 1001 "I" Street, Sacramento, CA

Research Project


A diesel particulate filter (DPF) is highly effective at removing particulate matter (PM) from the exhaust stream. Removing the collected soot (i.e., regenerating the filter) is a more challenging problem, and for this reason a large number of diesel engines are not compatible with currently ARB-verified DPFs. This includes many older engines found in school buses.

The objective of Cleaire's Inovative Clean Air Technology (ICAT) project with the Air Resources Board was to develop and demonstrate a product that decouples the regeneration from the engine's operating conditions through off-line electrical heating of the DPF. The ICAT project's goals were to optimize the hardware, control systems, and operational procedures to create a robust and fail safe PM control system that can be used in widespread duty cycles and on older engines.

The Horizon EPF and regenerative infrastructure performed as designed during the ICAT project and field demonstration. The chassis dynamometer testing validated the Level 3 emission reduction goal for the EPF (greater than 85% PM removal efficiency). Furthermore, the testing found that the Horizon EPF reduced the NO2 emissions, thus providing an additional air quality benefit. Cleaire successfully met the objectives of the ICAT project and is now commercializing the Horizon EPF product.

Speaker Biography

Brad Edgar, Ph.D., currently serves as the Executive Vice-President and Chief Technology Officer of Cleaire. In this role he leads the company's technical and marketing efforts in the area of diesel engine emission control.

Brad spearheaded the development of Longview®, Horizon-S™, Horizon-M™, and the Filter Cleaning System that meet the highest standards of the California Air Resources Board (CARB). Additionally, he was one of the chief architects of Cleaire's marketing and product plan. As a result of his efforts, more than 2,500 Cleaire systems have been sold and installed to reduce diesel emissions.

Brad has spent his entire career working with clean diesel technologies. He previously held the position of Chief Technology Officer at Ceryx Incorporated, and was the Technical Director of Thermatrix Diesel Systems. Over the course of his career, Brad has invented or co-invented nine United States patents.

Brad earned a Bachelors of Science and Ph.D. in Mechanical Engineering from the University of California at Berkeley. As an undergraduate, Brad was a four-year letter winner for the football team and earned the 1989 team award for most valuable special teams play. Brad and his wife, Ankie, live in Oakland, California with their two children, Jackson and Rosi.

Michael Streichsbier, Ph.D., is currently a Senior Engineer and Project Manager at Cleaire. Dr. Streichsbier received his B.S., M.S, and Ph.D. degrees in Mechanical Engineering at the University of California, Berkeley. He has spent his career working on state-of-the-art emission control technologies. Michael is the product manager for the Horizon EPF and he managed the testing for the ICAT project.

Tom Swensen received his B.S. in Mechanical Engineering from the California State University, Sacramento and is a registered mechanical engineer in the State of California. Tom has extensive experience in the development and implementation of technology-based air quality improvement strategies related to internal combustion engines.

Tom joined Cleaire in August 2003 after 10 years of developing and implementing nationally recognized market-based vehicle and equipment emission reduction incentive programs for the Sacramento Metropolitan Air Quality Management District. Prior experience also includes work with a national consulting firm and the California Energy Commission.

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