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Research Thrusts |
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Engineering Education Innovation
As the world continues to change with globalization and technological advances so must engineering education p...
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Advanced Power System
In the face of an impending energy crisis, the Advanced Power Systems research center is exploring alternative...
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Space Systems
The Space Systems Research group is creating innovative electric propulsion systems to make space travel more ...
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Mechanics of Multi-scale Materials
The Mechanics of Multi-scale Materials research group uncovers the relationships of structures across the full...
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Multi-scale Sensors and Systems
The Multi-scale Sensors and Systems Research Group specializes in the design, fabrication, integration, and te...
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Sustainable Manufacturing and Design
Many of the campus research efforts on sustainability are coordinated by the Sustainable Futures Institute (SF...
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Research Projects
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Ionization Signal Analysis for Combustion Feedback |
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Project Date:
07/2007-06/2008 |
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Web Site
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Sponsor:
Ford Motor Company
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In-cylinder ion sensing is a subject of interest due to its application in spark-ignited (SI) engines for feedback control and diagnostics including: combustion knock detection, rate and phasing of combustion, and misfire On-Board Diagnostics (OBD). Further advancement and application is likely to continue as the result of the availability of ignition coils with integrated ion-sensing circuitry making ion sensing more versatile and cost effective.
In SI engines, combustion knock is controlled through closed-loop feedback from sensor metrics to maintain knock near the borderline, below engine damage and NVH thresholds. Combustion knock is one of the critical applications for ion sensing in SI engines and improvement in knock detection offers the potential for increased thermal efficiency.
This work analyzes and characterizes the ionization signal in reference to the cylinder pressure signal under knocking and non-knocking conditions. Combustion data including cylinder pressure and ionization signals from a 2.0L I4 and a 5.4L V8 engine are collected at varying operating conditions. The ion and pressure signals are characterized and compared through the use of frequency analysis, correlation, and coherence. The results show that the correlation and coherence are low as a result of both the ion and pressure signals being point measurements and the stochastic aspects of combustion knock and characteristics of the in-cylinder pressure waves. Using additional statistical analysis however, the results show a high correlation of knock levels between the ion and cylinder pressure measurements
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