Electricity: measuring and testing – Internal-combustion engine ignition system or device – Electronic ignition system
Patent
1995-02-27
1997-10-14
Karlsen, Ernest F.
Electricity: measuring and testing
Internal-combustion engine ignition system or device
Electronic ignition system
324601, G01R 104, G01R 3102, G01R 3500, F02P 1100
Patent
active
056776322
ABSTRACT:
A calibrating pickup circuit detects, using primary and secondary pickups, the primary and secondary voltages of an ignition coil of known turns ratio. The pickup circuit includes a programmable gain amplifier, responsive to the detected secondary voltage waveform signal and to a gain control feedback signal for generating an amplified secondary voltage waveform signal wherein the feedback signal has an initial predetermined value in calibration mode and has a calibration value in signal monitor mode. A waveform multiplexing circuit is selectively operable in calibration mode to alternately sample the primary and the amplified secondary voltage waveform signals over a predetermined period to generate a single interlaced waveform signal. Waveform comparison is then performed by evaluating the single interlaced waveform signal and a secondary-to-primary ratio calculated representative of the signal strength difference between analogous portions of the primary and the amplified secondary voltage waveform signals A calibration value is then determined on the basis of the secondary-to-primary ratio and the known turns ratio of the ignition coil.
REFERENCES:
patent: 4064450 (1977-12-01), Morales et al.
patent: 4401948 (1983-08-01), Miura et al.
patent: 4490799 (1984-12-01), Marino et al.
patent: 4547859 (1985-10-01), Wiggins
patent: 5017874 (1991-05-01), Di Nunzio et al.
patent: 5087882 (1992-02-01), Iwata
patent: 5160892 (1992-11-01), Makhija et al.
patent: 5162725 (1992-11-01), Hodson et al.
patent: 5189373 (1993-02-01), Murata et al.
patent: 5196798 (1993-03-01), Baeza et al.
patent: 5215067 (1993-06-01), Shimasaki et al.
patent: 5226394 (1993-07-01), Shimasaki et al.
patent: 5237279 (1993-08-01), Shimasaki et al.
patent: 5245873 (1993-09-01), Fathauer et al.
patent: 5309884 (1994-05-01), Fukui et al.
patent: 5322045 (1994-06-01), Hisaki et al.
Brown, Gerald R., "How to Read and Interpret Automotive Oscilloscope Patterns", pp. 3-5, 29-31, Reston Publishing, 1985.
Bowser Barry C.
Karlsen Ernest F.
Snap-on Technologies, Inc.
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