Piezoelectric resonance type knock sensor for internal combustio

Details Piezoelectric resonance type knock sensor for internal combustio Piezoelectric resonance type knock sensor for internal combustio

1997-09-08

2000-09-05

Williams, Hezron

Measuring and testing

Engine detonation

Specific type of detonation sensor

73579, G01L 2322

Patent

active

061125776

ABSTRACT:
A piezoelectric resonance type knock sensor that is highly responsive and easy to assemble, wherein a bulged round seat section (washer 7) arranged under the lower surface of a thin metal plate 5 and coaxally with a support bolt 9 in such a way that the outer diameter of the bulged round seat section exceeds the inner diameter of an annular piezoelectric element 5, the lower end of a resilient connector member 11a arranged between a rod-shaped output terminal 11 and the vibration sensing member 4 is resiliently held in contact with an upper electrode 5a of the annular piezoelectric element 5 at a position located inside the outer periphery of the bulged round seat section, and the resonance frequency of its vibration sensing member can be regulated very easily to make itself a highly responsive and effective knock sensor.

REFERENCES:
patent: 4225802 (1980-09-01), Suzuki et al.
patent: 4254354 (1981-03-01), Keem
patent: 4491010 (1985-01-01), Brandt et al.
patent: 4630465 (1986-12-01), Hatton
patent: 4658650 (1987-04-01), Yorinaga et al.
patent: 4660410 (1987-04-01), Asano et al.
patent: 4704894 (1987-11-01), Inuzuka et al.
patent: 5218870 (1993-06-01), Komurasaki et al.

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