Apparatus and method for controlling air/fuel ratio using ionization measurements
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United States of America Patent
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Feb 29, 2000
Grant Date -
N/A
app pub date -
Feb 19, 1998
filing date -
Feb 20, 1997
priority date (Note) -
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Abstract
An air/fuel ratio control system for an internal combustion engine to reduce emissions and increase engine efficiencies includes an ionization apparatus for detecting and measuring ionization within a combustion cylinder and generating an ionization signal based upon the ionization detection and measurements. Also included is an air/fuel ratio controller in electrical communication with the ionization apparatus. The controller receives the ionization signal and controls the air/fuel ratio in the engine based at least in part upon the ionization signal. In a preferred embodiment of the control system, the controller controls the air/fuel ratio based upon a first local peak in the ionization signal. In another embodiment, the controller controls the air/fuel ratio based upon maximizing the first local peak in the ionization signal.
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