Remote engine speed indicator system

Details Remote engine speed indicator system Remote engine speed indicator system

1974-06-05

1976-03-02

Smith, Alfred E.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324 16R, G01P 348

Patent

active

039421139

ABSTRACT:
A system for indicating engine speed without physically contacting the engine, including a tachometer comprising an inductive loop which may be buried in the ground and connected to an electrical amplifying system which picks up very low frequency radio frequency (RF) pulses from the ignition system of an automobile or other vehicle whose engine is located above the loop. The tachometer includes controls for selecting the number of engine cylinders corresponding to the vehicle being tested and a meter readout providing a visible or other suitable indication of the vehicle's engine speed. Undesirable background noises are substantially eliminated by the pickup loop design and its orientation, input signal filtering, power line filtering, base line signal rejection and automatic gain control.

REFERENCES:
patent: 2999168 (1961-09-01), Henry
patent: 3601773 (1971-08-01), Frieling
patent: 3811089 (1974-05-01), Strzelewicz
Benrey, R. M., "Build Your Own Wireless`Tach," Popular Science, Mar. 1965, pp. 110-112.

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