This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A Fuel Rate Based Catalyst Pass Fraction Model for Predicting Tailpipe NOx Emissions from a Composite Car
Technical Paper
1999-01-0455
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Modeling tailpipe NOx emissions has always been difficult due to the complexity of the numerous factors involved in the catalytic conversion of the pollutant. Most emissions modeling has been based on steady state driving. A parameterized algebraic model for second-by-second tailpipe emissions of NOx for a composite Tier 1 car is presented employing data from the Federal Test Procedure Revision Project (FTPRP). Calculating fuel rate from measured engine out values, the catalytic converter is physically modeled based on the fuel rate history and a few fitted parameters. Under certain conditions, the changes in fuel rate are related to trends in the air to fuel ratio. The model accurately predicts the time dependence of hot stabilized tailpipe NOx emissions in the FTP bag 3 and US06 driving cycles. Modeling of low power driving, as in bag 2, is not as successful. Although tailored for a fleet average car, individual automobiles can be modeled with reasonable success by tweaking the parameters; they can have much different emissions profiles due to engine strategy, catalyst design, and driver variability.
Recommended Content
Authors
Citation
Nam, E. and Ross, M., "A Fuel Rate Based Catalyst Pass Fraction Model for Predicting Tailpipe NOx Emissions from a Composite Car," SAE Technical Paper 1999-01-0455, 1999, https://doi.org/10.4271/1999-01-0455.Also In
Gas Direct Injection Aftertreatment and Exhaust Aftertreatment Modeling
Number: SP-1455; Published: 1999-03-01
Number: SP-1455; Published: 1999-03-01
References
- Goodwin, Robert “A Model of Automobile Exhaust Emissions During High Power Driving Episodes and Related Issues,” Doctoral Dissertation 1996
- Goodwin, Robert Ross Marc “Off-Cycle Emissions from Moden Passenger Cars with Properly Functioning Emissions Controls,” SAE 960064 1996
- Haskew, Harold M. Cullen Kevin Liberty Thomas Langhorst William “The Execution of a Cooperative Industry/Government Exhaust Emissions Test Program,” SAE 94C016 1994
- An, Feng Ross Marc “The Use of Fuel by Spark Ignition Engines,” SAE 930329 1993
- Sovran, Gino Bohn Mark S. “Formula for the Tractive-Energy Requirement of Vehicles During the EPA Schedules,” SAE 810184 1981
- Thomas, Martin Ross Marc “Development of Second-by-Second Fuel Use and Emission Models Based on an Early 1990s Composite Car,” SAE 971010 1997
- Aquino, C.F. “Transient A/F Control Characteristics of the 5 Liter Central Fuel Injection Engine,” SAE 810494 1981
- Barth, Matthew Younglove Theodore Wenzel Tom Scora George An Feng Ross Marc Norbeck Joseph “Analysis of Modal Emissions From Diverse In-Use Vehicle Fleet,” Transportation Research Record 1587 1997