Internal-combustion engines – High tension ignition system – Current or voltage sensing in coil primary
Patent
1996-04-29
1998-04-07
Wolfe, Willis R.
Internal-combustion engines
High tension ignition system
Current or voltage sensing in coil primary
731173, F02P 1712
Patent
active
057352542
ABSTRACT:
A circuit for use with an ignition system to enable detection of an overvoltage condition in the primary winding of an ignition coil caused by opening of a power switch connected to the primary winding. The circuit senses the overvoltage condition by comparing the voltage on the primary winding to a first threshold voltage and produces a signal at an output terminal indicative of the presence of the overvoltage condition. The output terminal is maintained at a high logic level upon detection of an overvoltage condition and throughout the time duration of the overvoltage condition, and drops to a low logic level when the voltage on the primary winding falls to a second threshold voltage, which is lower than the first threshold voltage. Comparison circuitry is provided for sensing the overvoltage condition by reference to fixed voltage values. Logic circuitry responds to the comparison circuitry to produce the appropriate logic levels at the output terminal.
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Palara Sergio
Scaccianoce Salvatore
Sueri Stefano
Consorzio per la Ricerca sulla Microelettronica nel Mezzogiorno
Morris James H.
SGS--Thomson Microelectronics S.r.l.
Wolfe Willis R.
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