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Humidity Effects and Compensation in a Lean Burn Natural Gas Engine
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English
Abstract
The effect of humidity on the lean misfire limit and emissions from a lean burn, natural gas engine is described in this paper, along with a description of a practical humidity compensation method for incorporation into an electronic control system. Experiments to determine the effects of humidity on the lean limit and emissions are described. Humidity increases were shown to decrease the rate of combustion, reduce NOx emissions, and increase the levels of unburned hydrocarbon (HC) and carbon monoxide (CO) emissions. Data and calculations are also presented which demonstrate that increases in humidity will cause enleanment in a typical closed loop control system utilizing a universal exhaust gas oxygen (UEGO) sensor. A prototype system for humidity sensing and subsequent compensation based on these findings was implemented, and the system was found, through additional testing, to compensate for humidity very effectively.
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Citation
Kubesh, J. and Podnar, D., "Humidity Effects and Compensation in a Lean Burn Natural Gas Engine," SAE Technical Paper 971706, 1997, https://doi.org/10.4271/971706.Also In
References
- SAE Standard J1349 “Engine Power Test Code - Spark Ignition and Diesel,” Society of Automotive Engineers Warrendale, PA. 1985
- The National Atlas of the United States U.S. Department of the Interior, U.S. Geological Survey Washington, D.C. 1970
- Kubesh, J.T. et al. “Lean Limit and Performance Improvements for a Heavy-Duty Natural Gas Engine,” SAE Paper 961939 Society of Automotive Engineers 1996
- Quader, A.A. “Lean Combustion and the Misfire Limit in Spark Ignition Engines,” SAE Paper 741055 Society of Automotive Engineers 1974
- Taylor, C.F. The Internal Combustion Engine in Theory and Practice 2 Combustion. Fuels, Materials. Design The M.I.T. Press 1985
- Reynolds, W.C. Perkins, H.C. Engineering Thermodynamics 2nd McGraw-Hill New York, NY 1977
- Podnar, D.J. et al. “Development and Application of Advanced Control Techniques to Heavy-Duty Natural Gas Engines,” SAE Paper 961984 Society of Automotive Engineers 1996