Battery tach

Electricity: measuring and testing – Electrical speed measuring

Patent

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Details

361239, G01P 342

Patent

active

050049798

ABSTRACT:
A signal representing the RPM of an internal combustion engine is produced by a signal processor connected to the battery of the vehicle. The signal processor derives an electrical signal from the battery which contains signal components produced by operation of the vehicle ignition system, as well as components from a multitude of other sources such as the voltage regulator, fans, air conditioning and other electrical systems of the vehicle. The signal processor filters and signal processes the signal derived from the vehicle battery to produce a signal having a frequency which is related to the RPM of the engine.

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patent: 3909717 (1975-09-01), Gazzano
patent: 3934200 (1976-01-01), Schoonover et al.
patent: 4138728 (1979-02-01), Tung
patent: 4199800 (1980-04-01), Weit
patent: 4251774 (1981-02-01), Knodler
patent: 4449100 (1984-05-01), Johnson et al.

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