Tachometer system picking up ignition signals from vehicle groun

Details Tachometer system picking up ignition signals from vehicle groun Tachometer system picking up ignition signals from vehicle groun

1997-05-13

1999-03-16

Patidar, Jay M.

Electricity: measuring and testing

Electrical speed measuring

324170, 324392, G01P 342, F02P 1700

Patent

active

058835105

ABSTRACT:
A ground pick-up tachometer for detecting a rotational speed of an engine in a vehicle includes a probe arranged for connection to a vehicular ground to detect signals emitted from an ignition system of the engine. A tachometer circuit is operatively connected to the probe to identify the detected signals representing ignition sparks and provide an output representative of the rotational speed of the engine based on the identified signals. The tachometer circuit includes a circuit common reference, separate from the vehicular ground.

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