Vibration detecting device

Details Vibration detecting device Vibration detecting device

1989-02-21

1990-10-09

Chapman, John

Measuring and testing

Engine detonation

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

310329, G01L 2322

Patent

active

049613383

ABSTRACT:
A vibration detecting device attached to, for example, an internal combustion engine with a boss having a mounting surface for mounting the device which has the purpose of detecting knocking of the engine from the vibration thereof. The device has a housing containing a piezoelectric element and a weight which is adapted to impose inertial force on the piezoelectric element in response to vibrations from the engine whereby signals representing the vibrations are derived from the piezoelectric element. The housing has a effective contact surface which is smaller in area than the mounting surface, and the whole of which is in face contact with the mounting surface when mounted. The device is so arranged that the signals from the piezoelectric element represent the vibrations from the engine exactly as the are.

REFERENCES:
patent: 4190782 (1980-02-01), Guess
patent: 4468950 (1984-09-01), Ishigami et al.
patent: 4475508 (1984-10-01), Okada
patent: 4660409 (1987-04-01), Miyata et al.

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