This paper presents the work done to date on a modeling study of the Non-Selective Catalytic Reduction (NSCR) system. Several recent experimental studies indicate that the voltage signal from the heated exhaust gas oxygen sensor commonly used to control these emission reduction systems may not be interpreted correctly because of the physical nature in the way the sensor senses the exhaust gas concentration. While the current signal interpretation may be satisfactory for modest NOX and CO reduction, an improved understanding of the signal is necessary to achieve consistently low NOX and CO emission levels. The increasingly strict emission regulations may require implementing NSCR as a promising emission control technology for stationary spark ignition engines. Many recent experimental investigations that used NSCR systems for stationary natural gas fueled engines showed that NSCR systems were unable to consistently control the emissions level below the compliance limits. Modeling of NSCR components to better understand, and then exploit, the underlying physical processes that occur in the lambda sensor and the catalyst media is now considered an essential step toward improving NSCR system performance. This paper focuses only on the lambda sensor that provides feedback to the air-to-fuel ratio controller. The goals of this modeling study are: • Improve the understanding of the transport phenomena and electrochemical processes that occur within the sensor. • Investigate the cross-sensitivity of exhaust gases from natural gas fueled engines on the sensor performance. • Serve as a tool for improving NSCR control strategies. This model simulates the output from a planar switch type lambda sensor. The model consists of three modules. The first module models the multi-component mass transport through the sensor protective layer. A one dimensional mass conservation equation is used for each exhaust gas species. Diffusion fluxes are calculated using the Maxwell-Stefan equation. The second module includes all the surface catalytic reactions that take place on the sensor platinum electrodes. All kinetic reactions are modeled based on the Langmuir-Hinshelwood kinetic mechanism. The third module is responsible for simulating the reactions that occur on the electrolyte material and determining the sensor output voltage. The details of these three modules as well as a parametric study that investigates the sensitivity of the output voltage signal to various exhaust gas parameters is provided in the paper.
Skip Nav Destination
ASME 2010 Internal Combustion Engine Division Fall Technical Conference
September 12–15, 2010
San Antonio, Texas, USA
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-4944-6
PROCEEDINGS PAPER
Interpreting the Lambda Sensor Output Signal to Control Emissions From Natural Gas Fueled Engines Available to Purchase
Mohamed Toema,
Mohamed Toema
Kansas State University, Manhattan, KS
Search for other works by this author on:
Kirby S. Chapman
Kirby S. Chapman
Kansas State University, Manhattan, KS
Search for other works by this author on:
Mohamed Toema
Kansas State University, Manhattan, KS
Kirby S. Chapman
Kansas State University, Manhattan, KS
Paper No:
ICEF2010-35164, pp. 563-575; 13 pages
Published Online:
January 10, 2011
Citation
Toema, M, & Chapman, KS. "Interpreting the Lambda Sensor Output Signal to Control Emissions From Natural Gas Fueled Engines." Proceedings of the ASME 2010 Internal Combustion Engine Division Fall Technical Conference. ASME 2010 Internal Combustion Engine Division Fall Technical Conference. San Antonio, Texas, USA. September 12–15, 2010. pp. 563-575. ASME. https://doi.org/10.1115/ICEF2010-35164
Download citation file:
17
Views
Related Proceedings Papers
Related Articles
Gasoline Engine and Aftertreatment Modeling and Control
Mechanical Engineering (December,2015)
A Comprehensive Model to Predict Three-Way Catalytic Converter
Performance
J. Eng. Gas Turbines Power (April,2002)
Effects of B20 on Emissions and the Performance of a Diesel Particulate Filter in a Light-Duty Diesel Engine
J. Eng. Gas Turbines Power (November,2010)
Related Chapters
Introduction
Consensus on Operating Practices for Control of Water and Steam Chemistry in Combined Cycle and Cogeneration
Lay-Up and Start-Up Practices
Consensus on Operating Practices for Control of Water and Steam Chemistry in Combined Cycle and Cogeneration
QP Based Encoder Feedback Control
Robot Manipulator Redundancy Resolution