Tachometer without physical connection to internal combustion en

Details Tachometer without physical connection to internal combustion en Tachometer without physical connection to internal combustion en

1975-04-30

1976-09-07

Gill, James J.

Measuring and testing

Vehicle drive train

Rear end

G01M 1500

Patent

active

039787192

ABSTRACT:
A tachometer includes a transducer for sensing pressure variations at the end of the exhaust pipe, or other easily-accessible point, due to explosions in an internal combustion engine. The transducer produces a corresponding electrical signal having a prominent selected frequency component which varies in frequency in direct proportion with engine speed. As the engine speed is increased and decreased, the electrical signal is passed through an amplifier with automatic gain control, and through a tracking filter to separate the prominent frequency component from other components. The separated component may be applied to a frequency-measuring device calibrated to display the revolutions per minute of the engine, or to a computer which computes and displays the result of an acceleration burst test.

REFERENCES:
patent: 2879467 (1959-03-01), Stern
patent: 3059480 (1962-10-01), Carpenter
patent: 3195525 (1965-07-01), Beck
patent: 3574475 (1971-04-01), Wolff
patent: 3731533 (1973-05-01), Geery
patent: 3908167 (1975-09-01), Hulls, et al.

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