Knocking sensor

Details Knocking sensor Knocking sensor

1980-04-08

1982-07-06

Gill, James J.

Measuring and testing

Engine detonation

Combustion signal compared to reference signal varied by a...

73660, G01L 2322

Patent

active

043376401

ABSTRACT:
A knocking sensor having a thin vibrating plate (10) receiving sound produced from an engine. The vibrating plate is applied with a piezoelectric element (11) which delivers electric output in proportion to the vibration. The resonance frequency of the vibrating plate is made same as the knocking frequency. A resonant tube (20) for forming resonating cavity is attached in front of the vibrating plate. A sound collector (30) is provided in front of the vibrating plate. A duct (50) is arranged between the sound collector and the sensor to improve sensitivity and freedom of mounting of the sensor.

REFERENCES:
patent: 1715831 (1929-06-01), Hahnemann
patent: 1907415 (1933-05-01), Carpenter et al.
patent: 2340714 (1944-02-01), Traver et al.
patent: 3069672 (1962-12-01), Rau
patent: 4190782 (1980-02-01), Guess
patent: 4220831 (1980-09-01), Zink
patent: 4228379 (1980-10-01), Guscott et al.

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