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Project at a Glance

Project Status: complete

Title: Electric diesel particulate filter demonstration. Final report

Principal Investigator / Author(s): Edgar, Bradley L., Ph.D

Contractor: Cleaire Advanced Emission Controls, LLC

Contract Number: ICAT 04-2

Research Program Area: Emissions Monitoring & Control

Topic Areas: ICAT Grants / Technology, Mobile Sources & Fuels


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 ICAT project 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.


For questions regarding this research project, including available data and progress status, contact: Research Division staff at (916) 445-0753

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