Particle Matter Generation and Characterization Control Using FOCAS® HGTR®, 03-R9799

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Principal Investigators
Cynthia C. Webb
John W. Miller

Inclusive Dates:  04/01/08 – Current

Background - The FOCAS® HGTR® system is a diesel-fueled burner used to expose full-size diesel emission system components to simulated diesel exhaust gas. Completion of a recent IR&D project (No. 03.R9687) gave the FOCAS HGTR the ability to provide close loop control on both water vapor and NOx concentration in the exhaust gas stream. This capability allowed the system to be used to simulate the exhaust of an on-highway modern technology diesel engine and enabled it to be used in a client program for bench aging of two full size selective catalytic reduction (SCR) catalyst systems simultaneously.

The current IR&D investigation concentrates on expanding the system's capability to provide a means for generation and control of the rate and composition of particulate matter (PM) in the exhaust stream produced by FOCAS HGTR. This capability will expand the system functionality to include the ability to provide soot for loading and a means for regenerating diesel particulate filters (DPFs). Completion of this study will result in a FOCAS HGTR system that can be used to effectively evaluate DPF technologies, generating test data comparable to that achieved by using a modern on-highway, heavy-duty diesel engine.

Approach - The investigation is divided into two phases. Phase I includes several parallel tasks that provide in-depth understanding about typical PM composition generated from a current technology heavy duty diesel engine and the PM generation characteristics of the modified FOCAS HGTR system. The baseline PM composition data for the investigation were gathered and analyzed from a modern on-road heavy-duty diesel and be analyzed to provide.

The FOCAS HGTR system will be equipped with new hardware to create the carbon and soluble organic fraction (SOF) portions of the PM composition. A map-based control strategy will be developed to allow a user to input the desired PM mass rate and the ratio of carbon and SOF for the generated PM for a given temperature set point and total exhaust flow rate. PM samples from the burner system exhaust will be collected and analyzed for total weight and SOF, as well as particle size distribution.

Accomplishments - Baseline PM compositions have been developed from engine testing and new hardware has been designed, fabricated and installed on the FOCAS HGTR. Initial tests have been performed to generate and characterize the carbon portion of the exhaust. The next step will be to introduce the SOF potion using oil injection and develop the control system to vary the composition from user inputs.

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