This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Achieving 0.02 g/bhp-hr NO x Emissions from a Heavy-Duty Stoichiometric Natural Gas Engine Equipped with Three-Way Catalyst
Technical Paper
2017-01-0957
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
It is projected that even when the entire on-road fleet of heavy-duty vehicles operating in California is compliant with 2010 emission standards of 0.20 g/bhp-hr, the National Ambient Air Quality Standards (NAAQS) requirements for ambient ozone will not be met. It is expected that further reductions in NOX emissions from the heavy-duty fleet will be required to achieve compliance with the ambient ozone requirement. To study the feasibility of further reductions, the California Air Resources Board (CARB) funded a research program to demonstrate the potential to reach 0.02 g/bhp-hr NOX emissions. This paper details the work executed to achieve this goal on the heavy-duty Federal Test Procedure (FTP) with a heavy-duty natural gas engine equipped with a three-way catalyst. A Cummins ISX-12G natural gas engine was modified and coupled with an advanced catalyst system. In addition to close-coupled and underfloor catalysts, a high energy ignition system and advanced exhaust gas recirculation (EGR)-fuel-air mixer were incorporated into the engine system. New cold start calibrations were developed, improved air-fuel ratio control was implemented, and the engine was able to demonstrate composite NOX emissions of 0.015 g/bhp-hr for the FTP, 0.002 g/bhp-hr for the RMC, and 0.008 g/bhp-hr for the World Harmonized Transient Cycle (WHTC). Additional calibration may yield further improvements for duty cycles beyond the FTP and WHTC. Results from this study demonstrate a potential pathway to achieving ultra-low NOX emissions on future heavy-duty vehicles.
Recommended Content
Authors
Topic
Citation
Smith, I., Briggs, T., Sharp, C., and Webb, C., "Achieving 0.02 g/bhp-hr NOx Emissions from a Heavy-Duty Stoichiometric Natural Gas Engine Equipped with Three-Way Catalyst," SAE Technical Paper 2017-01-0957, 2017, https://doi.org/10.4271/2017-01-0957.Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| Unnamed Dataset 1 | ||
| Unnamed Dataset 2 | ||
| Unnamed Dataset 3 | ||
| Unnamed Dataset 4 | ||
| Unnamed Dataset 5 | ||
| Unnamed Dataset 6 | ||
| Unnamed Dataset 7 | ||
| Unnamed Dataset 8 |
Also In
References
- Board, California Air Resources Evaluating Technologies and Methods to Lower Nitrogen Oxide Emissions from Heavy-Duty Vehicles. Evaluating Technologies and Methods to Lower Nitrogen Oxide Emissions from Heavy-Duty Vehicles September 2 2016 September 22 2016 https://www.arb.ca.gov/research/veh-emissions/low-nox/low-nox.htm
- Cummins-Westport ISX12 G - Specifications Cummins-Westport September 22 2016 http://www.cumminswestport.com/models/isx12-g
- Properties of Natural Gas DieselNet Technology Guide May 2003 September 22 2016 https://www.dieselnet.com/tech/fuel_cng.php
- Results of the Advanced, Stationary, Reciprocating, Natural Gas Engine Workshop Southwest Research Institute Final Report 1999
- Stochowicz , R. et al,. Design and Development of Waukesha’s Stoichiometric, Cooled EGR Engine for the California ARICE Program Proceedings of ICEF2005, ICEF2005-1329, ASME Fall Technical Conference 2005
- Zigler , Brad Demo Projects Introduce New Class of Natural Gas Vehicles http://www.nrel.gov/docs/fy13osti/55971.pdf
- Walls , Mark Next Generation Natural Gas Engine 2014 Http://www.naturalgaspathway.com/wp-content/uploads/2014/03/Low-Emission-Natural-Gas-Engines_Mark-Walls.pdf Southwest Research Institute San Antonio, TX