Measuring and testing – Engine detonation – Specific type of detonation sensor
Reexamination Certificate
2006-06-06
2006-06-06
McCall, Eric S. (Department: 2855)
Measuring and testing
Engine detonation
Specific type of detonation sensor
C073S118040
Reexamination Certificate
active
07055372
ABSTRACT:
The present feature of the invention comprises a method and apparatus for determining cylinder ID. When a cylinder is compressed, the resistance increases across the spark plug gap. Thus, if a spark coil is only partially charged before activation of the spark, the air gap is not broken down and no ignition occurs in the cylinder in compression. The failure of a spark plug to spark is reflected in the ionization signal. In a preferred embodiment, the dwell time is selected so that the spark plug located in a cylinder that is not in compression will spark, while a spark plug in a cylinder that is in compression will not. The cylinder in compression will output an ionization signal with a shorter duration than a cylinder not in compression. In a preferred embodiment, two methods are used to calculate the duration of the spark, edge detection and integration.
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Combined Search and Examination Report under Sections 17 and 18(3) dated May 14, 2004 from the United Kingdom Patent Office (6 pages).
Breton Mathew
Daniels Chao F.
Nation Michael T.
Zhu Guoming G.
Dickinson Wright PLLC
McCall Eric S.
Visteon Global Technologies Inc.
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