Internal-combustion engines – High tension ignition system – Responsive to engine or environmental condition
Patent
1996-05-22
1997-06-10
Dolinar, Andrew M.
Internal-combustion engines
High tension ignition system
Responsive to engine or environmental condition
123630, 123637, 73116, F02P 1700
Patent
active
056366205
ABSTRACT:
A self-diagnosing ignition drive circuit for applying a first ignition drive signal to a spark plug in an internal combustion engine cylinder for generating an arc across the electrodes thereof to ignite an air/fuel mixture in the cylinder and, following a delay period, applying a second ignition drive signal to the spark plug for generating a second arc across the electrodes to contribute combustion energy and to provide for measurement of the frequency content of energy trapped in an ignition coil during combustion. If the frequency content includes a predetermined frequency, improper ignition in the cylinder is diagnosed through excitation of a natural frequency of a misfire detection circuit coupled to the ignition coil corresponding to at least one engine cylinder.
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SAE Paper, "Spark Plug Voltage Analysis for Monitoring Combustion in an Internal Combustion Engine", Shimasaki et al Mar. 1-5, 1993.
SAE Paper, "Flame Ion Density Measurement Using Spark Plug Voltage Analysis" Miyata et al Mar. 1-5, 1993.
Bracken Norman H.
Kiess Ronald J.
Bridges Michael J.
Dolinar Andrew M.
General Motors Corporation
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