Internal-combustion engines – Spark ignition timing control – Electronic control
Reexamination Certificate
2007-05-08
2007-05-08
Cronin, Stephen K. (Department: 3747)
Internal-combustion engines
Spark ignition timing control
Electronic control
C123S406140
Reexamination Certificate
active
11046383
ABSTRACT:
This feature of the present invention comprises a system and method of controlling exhaust gas recirculation (EGR) based on a measure combustion stability measure. The combustion stability measure is obtained by determining the integration duration of the engine ionization signal, i.e., the crank angle at which the integral of the ionization signal reaches a specified percentage of its total. The present invention uses the integration duration to control the maximum EGR rate of the engine in a closed loop while maintaining the combustion stability of an internal combustion engine.
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Thesis paper entitled “Estimation of the EGR Rate in a GDI Engine Working in Stratified Mode Using the Ionization Current,” by Mattias Bruce; LiTH-ISY-EX-3083; Dec. 12, 2000.
Research article entitled “Estimation of Combusion Variability Using In-Cylinder Ionization Measurements,” by Stefan Byttner, Thorsteinn Rognvaldsson, and Nicholas Wickstrom; Intelligent Systems Laboratory, IDE, Halmstad University, Sweden; 2001-01-3485.
Daniels Chao F.
Haskara Ibrahim
Zhu Guoming G.
Castro Arnold
Cronin Stephen K.
Dickinson Wright PLLC
Visteon Global Technologies Inc.
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