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John
H. Johnson
Personal Web Page
Email: jjohnson@mtu.edu
Research Professor & Presidential Professor Emeritus
PhD, University
of Wisconsin–Madison
Internal Combustion Engines, Diesels, Air Pollution, Emissions
Modeling
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Research
Interests
A catalyzed ceramic particulate matter filter is examined relative to its effect on emissions and the passive
regeneration process within. The emissions are measured relative to their size distribution, and chemical/
biological character. Modeling relative to the pressure drop and mass of particulate matter in the filter is being
developed. A 1-dimensional 2 layer single channel wall-flow particulate filter model is being applied with
output variables being the outlet size distribution and particle concentration, the mass of particulate matter retained in the filter, and the
mass oxidized by NO2 and thermal including the location in the filter where oxidation is taking place. The diesel laboratory has been
designed to include the study of active regeneration of the particulate matter deposited in the filter. A new advanced ceramic material for
diesel particulate filters is being studied and the pressure drop, active regeneration characteristics, and the filtration efficiency of these
filters will be compared to a conventional ceramic material being used on new heavy-duty vehicles in 2007. A lumped parameter model
for the particulate filter is being used to simulate the catalyzed particulate filter in a heavy-duty truck. A Vehicle Engine Aftertreatment
System Simulation (VEASS) was developed and is used for particulate filter and NOx control system studies. A model based control
system is being simulated using VEASS to control the regeneration process. A project is also underway to model the control of nitrogen
oxides using a SCR catalyst which is modeled as part of the overall control system model.
Publications
- Singh, S., Johnson, J. H., Parker G.G., and Yang, S.L., “Vehicle Aftertreatment System Simulation (VEASS Model: Application to a
Controls Design Strategy for Active Regeneration of a Catalyzed Particulate Filter”, SAE Paper No. 2005-01-0970, Presented at
SAE 2005 World Congress, April 11-14, 2005.
- Shende, A.S., Johnson, J.H., Yang, S.L. Bagley, S. T., and Thalagavara A. M., “The Filtration and Particulate Matter Oxidation
Characteristics of a Catalyzed Wall-flow Diesel Particulate Filter: Experimental and 1-D 2-Layer Model Results,” SAE Paper No.
2005-01-0949, Presented at SAE 2005 World Congress, April 11-14, 2005
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