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Project at a Glance

Project Status: complete

Report Published December 1992:

Title: Heavy-duty diesel particulate trap demonstration for: state of California-Air Resources Board

Principal Investigator / Author(s): Ha, K

Contractor: Ortech International

Contract Number: 5767 & 98-6001250

Research Program Area: Emissions Monitoring & Control

Topic Areas: Mobile Sources & Fuels


This is the Final Report that summarizes work conducted for the State of California, Air Resources Board Contract No. A776-179 between July 1988 - June 1992. The project called for the evaluation of various options to control diesel particulate emissions from heavy-duty vehicles, with the final design and manufacture of two particulate trap systems. The systems should withstand durability testing up to 400 hours to verify their operation and performance in removal of particulate matter.

The contract was awarded to Donaldson Company Incorporated (DCI) to provide two electrical trap systems, one system for a transit bus engine (6V-92TAC) and the other for a heavy-duty diesel truck powered by a four-stroke engine. The trap systems would be retrofitted to the heavy-duty vehicles and evaluated in service for 12 months.

Due to delays in obtaining the heavy-duty diesel truck, the installation and on-road demonstration of the trap system on the heavy-duty diesel truck did not materialize and eventually this part of the program was canceled. The on-road evaluation period for the bus was increased to 24 months.

The particulate trap system was tested in the test cell to verify its operation and performance in removal of particulate matter. The test bed results indicated that a two trap, electrically regenerated system performed satisfactorily under all engine conditions. The results indicated a particulate removal efficiency range of 62 percent to 89 percent.

The trap system was installed, together with a datalogger, in Southern California Rapid Transit District Bus #8924 and operated for a period of 24 months. The results from the datalogger indicated a number of successful regenerations conducted during the demonstration period averaging approximately four hours per regeneration. The results showed that the system is viable for application to a bus equipped with a Detroit Diesel Corporation 6V-92TA diesel engine.

Bus #8924 was periodically tested for emissions on a chassis dynamometer. The results indicated a particulate trap efficiency range of 68 percent to 89 percent.


For questions regarding this research project, including available data and progress status, contact: Heather Choi at (916) 322-3893

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