G - Physics – 01 – P
Patent
G - Physics
01
P
73/164
G01P 3/54 (2006.01) G01L 23/24 (2006.01) G01M 15/04 (2006.01) G01M 15/10 (2006.01) G01P 3/489 (2006.01)
Patent
CA 1044043
TACHOMETER WITHOUT PHYSICAL CONNECTION TO INTERNAL COMBUSTION ENGINE Abstract of the Disclosure 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.
250107
Hadden Stephen C.
Hulls Leonard R.
Slaney Patrick J.
Sutphin Eldon M. (jr.)
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