Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-09-15
1978-09-05
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
F02P 1700
Patent
active
041123506
ABSTRACT:
The signal indicative of switching of the ignition primary coil of a spark ignition engine is conditioned by means of compatible, combined, multiple and variable threshold testing of both the high end and the low end of the coil primary, without need to know (or alter operation in dependence upon) whether the engine employs positive switching at the high end of the primary coil or negative switching at the low end of the primary coil. To sense the end of the dwell period, the high coil voltage is compared against a negative voltage which will never occur if low coil switching is employed, but which will occur at the start of firing time in a positive switching system. Similarly, low coil is compared against a positive voltage which would never occur in a positively switched system, but which does occur at the start of firing time if negative switching is used. The circuits recognizing the start of dwell time require both that high coil be in excess of some low voltage and that low coil be less than some fraction of battery voltage; when positive switching is used, low coil is always at or near ground and therefore always meets the test; when negative switching is used, high coil is always at battery and therefore always meets the test.
REFERENCES:
patent: 3543143 (1970-11-01), Wanninger
patent: 4074183 (1978-02-01), Voross
Levitre et al., Method for Ignition Breaker Points, Capacitor Testing, & Servicing Decisions, IBM Tech. Discl. Bull., Mar. 1971, p. 3189.
Back Paul R.
Van Vessem Thomas G.
Krawczewicz Stanley T.
United Technologies Corporation
Williams M. P.
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