Device for measuring the ionization current in a radiofrequency ignition system for an internal combustion engine
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United States of America Patent
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Apr 21, 2015
Grant Date -
Oct 13, 2011
app pub date -
Jul 30, 2009
filing date -
Sep 9, 2008
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Abstract
A device for radiofrequency ignition of an internal combustion engine, including a power supply circuit including a transformer with a secondary winding connected to at least one resonator that has a resonant frequency in excess of 1 MHz and including two electrodes configured to generate a spark to initiate combustion of a combustible mixture in a cylinder of the engine in response to an ignition command. A measuring capacitor is connected in series between the secondary winding and the resonator, a measurement circuit measures a current at terminals of the measuring capacitor, the current providing an electrical image of how combustion is progressing, and a protection circuit is connected between the capacitor and the measurement circuit and is configured to spare the current measurement acquisition time from electrical effects caused by the ignition command.
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