Internal-combustion engines – High tension ignition system – Having dwell control
Reexamination Certificate
2006-03-21
2006-03-21
Gimie, Mahmoud (Department: 3747)
Internal-combustion engines
High tension ignition system
Having dwell control
C123S630000
Reexamination Certificate
active
07013882
ABSTRACT:
An ignition control circuit (12) is responsive to a control signal (ESTC) to apply a drive signal (GD) to a power switching device (22) to conduct ignition coil current (IC) therethrough. A resistor (RS) included within the circuit (12) receives, and dissipates heat generated by, the coil current (IC). The circuit (12) includes a first transistor (QHOT) positioned adjacent to the resistor (RS) such that an operating temperature thereof is near that of the resistor (RS), and a second transistor (QREF) positioned remote from the resistor (RS) and having an operating temperature defining a reference temperature. The first and second transistors (QHOT, QREF) are configured to produce an output voltage (VOUT) proportional to a difference in operating temperatures thereof, and a latch circuit (L1) disables the control signal (ESTC) to thereby turn off the power switching device (22) when the output voltage (VOUT) difference exceeds a reference voltage (VREF).
REFERENCES:
patent: 4446843 (1984-05-01), Rumbaugh et al.
patent: 6360720 (2002-03-01), Kesler
patent: 6668811 (2003-12-01), Kesler
Butler, Jr. Raymond O.
Kesler Scott B.
Long Jerral A.
Chmielewski Stefan V.
Delphi Technologies Inc.
Gimie Mahmoud
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