Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1978-05-12
1980-05-20
Rolinec, Rudolph V.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
361242, 123102, 340671, G01P 342
Patent
active
042041570
ABSTRACT:
Electronic signal processing circuitry for use in the ignition system of an internal combustion engine is disclosed herein. A signal generator which receives crankshaft position pulses from a sensor and produces periodic outut pulses which have durations equal to a constant percentage of the period of the input sensor pulses is disclosed. The generator includes a crankshaft position sensor feeding a bistable flip-flop which controls a dual slope integrator circuit having its output coupled to a comparator with the comparator output coupled back to the reset terminal of the flip-flop. The generator produces pulses at the output of the flip-flop which have durations equal to a constant percentage of the period of the crankshaft position sensor pulses. An engine speed monitoring circuit receives the periodic varying ramp signal produced by the dual slope integrator and via sampling circuitry produces an output signal related to engine speed whose magnitude is updated during each cycle of the crankshaft position pulses.
REFERENCES:
patent: 3563219 (1971-02-01), Mieras
patent: 3743940 (1973-07-01), Yamagata
patent: 4057740 (1977-11-01), Arguello
Gillman James W.
Klein Melvin A.
Melamed Phillip H.
Motorola Inc.
Rolinec Rudolph V.
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