Electricity: measuring and testing – Internal-combustion engine ignition system or device – In situ testing of spark plug
Reexamination Certificate
2005-10-11
2005-10-11
Deb, Anjan (Department: 2858)
Electricity: measuring and testing
Internal-combustion engine ignition system or device
In situ testing of spark plug
C324S388000
Reexamination Certificate
active
06954074
ABSTRACT:
A circuit for measuring ionization current in a combustion chamber of an internal combustion engine including an ignition coil, having a primary winding and a secondary winding, and an ignition plug. The ignition plug ignites an air/fuel mixture in the combustion chamber and produces an ignition current in response to ignition voltage from the ignition coil. A capacitor, charged by the ignition coil, provides a bias voltage producing an ionization current after ignition of the air/fuel mixture in the combustion chamber. A current mirror circuit produces an isolated current signal proportional to the ionization current. In the present invention, the ignition current and the ionization current flow in the same direction through the secondary winding of the ignition coil. The charged capacitor operates as a power source and, thus, the ignition current flows from the charged capacitor through the current mirror circuit and the ignition coil to the ignition plug.
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Gould Kenneth L.
Wang Bruce
Zhu Guoming G.
Dickinson Wright PLLC
Visteon Global Technologies Inc.
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