Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-09-15
1979-08-21
Myhre, Charles J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 16R, G01M 1500
Patent
active
041654811
ABSTRACT:
The voltage across the primary of the ignition coil of a spark ignition engine is limited so as to defeat ignition, while at the same time allowing measurement of ignition-related signals, by means of unilateral impedance means which are selectively connected by a switch in parallel with the ignition coil primary, to service engines both with and without series impedance in the low coil signal line. To avoid reversed-polarity connection, the switch is operable only if the average voltage between high coil and low coil connections indicate correct polarity. Sensing of high coil and low coil signals indicative of firing time and dwell is achieved by monitoring current flow through the unilateral ignition defeat impedance, by means of an optical isolator resistively coupled across the unilateral impedance; current in the optical isolator is limited by means of a shunt transistor, and the optical isolator is protected against high voltages by an additional unilateral impedance. The ignition defeat and current-responsive sensing of the end of the dwell period is utilized with other signal conditioning circuitry to provide signals delineating firing time and dwell.
REFERENCES:
patent: 3763420 (1973-10-01), Maisonville
patent: 3767902 (1973-10-01), Estes et al.
patent: 3775672 (1973-11-01), Letosky
patent: 3946305 (1976-03-01), Hasbrouck et al.
patent: 3946306 (1976-03-01), Hasbrouck
patent: 3968425 (1976-07-01), Hanson et al.
patent: 3986009 (1976-10-01), Fastaia
Back Paul R.
Wells John C.
Myhre Charles J.
Nelli R. A.
United Technologies Corporation
Williams M. P.
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