Engine running time indicator

Details Engine running time indicator Engine running time indicator

1975-02-18

1976-06-29

Jackson, Edith Simmons

58 395, G07C 302, G04F 800

Patent

active

039656691

ABSTRACT:
A cumulative running time indicator for use with an engine has a ceramic resonator-controlled oscillator that drives an electronic divider, a multiplexer, and a stepping motor which is connected through a gear train to a mechanical display showing elapsed time. The running time indicator operates only when an electrical generator, which is mechanically coupled with the engine, produces sufficient voltage to operate the indicator circuits. Sufficient voltage is produced at all engine speeds above a threshold speed which is less than engine idling speed. The generator supplies ac voltage to doubler circuit that has two separate outputs -- one for supplying large pulses of current for the stepping motor, and a partially isolated second output for other electronic loads. A tachometer output signal is provided at an auxiliary output terminal and is buffered to prevent disablement of the running time indicator by short circuits and externally applied voltages at the auxiliary output terminal. The running time indicator is therefore self-powered, relatively secure from tampering, and accurate.

REFERENCES:
patent: 2660057 (1953-11-01), Ackley
patent: 3854281 (1974-12-01), Reichert

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