Knock sensor

Details Knock sensor Knock sensor

2006-03-07

2006-03-07

Williams, Hezron (Department: 2856)

Measuring and testing

Engine detonation

Specific type of detonation sensor

C310S329000, C310S365000

Reexamination Certificate

active

07007544

ABSTRACT:
A knock sensor of the invention includes a base having a cylindrical part mounted on a vibration generating part and a flange part, an annular piezoelectric element fitted to the cylindrical part and for converting a knocking vibration of the vibration generating part into an electric signal to detect it, electrodes respectively provided to be in contact with both surfaces of the piezoelectric element, terminal plates disposed to be in contact with the respective electrodes and for extracting an output of the piezoelectric element to outside, and a hold unit for pressure holding the piezoelectric element, the electrodes and the terminal plates to the flange part, in which the electrodes are provided to be in partial contact with the piezoelectric element, and an electric insulating material having an almost equal thickness to the electrode is provided on a portion of the piezoelectric element which is not in contact with the electrode.

REFERENCES:
patent: 4964294 (1990-10-01), Kawajiri et al.
patent: 6786078 (2004-09-01), Brammer
patent: 2002-257624 (2002-09-01), None

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