Measuring and testing – Engine detonation – Combustion signal compared to reference signal varied by a...
Patent
1990-03-09
1992-06-30
Chapman, John E.
Measuring and testing
Engine detonation
Combustion signal compared to reference signal varied by a...
73517R, G01P 1509
Patent
active
051252635
ABSTRACT:
An acceleration detector comprising a housing and an acceleration transducer assembly including a piezoelectric element, an inertial weight and an output terminal. A thread-engaging fastener on the bushing, for securing the transducer assembly in the housing, and an electrically insulating washer is provided, and a resilient filler material is applied around the acceleration transducer assembly in the housing so that the movement of the inertial weight relative to the housing is allowed when an acceleration is applied. An electrically insulating, low-friction washer made of a plastic material selected from a group consisting of polyester, polyethylene terephtalate and polyphenylene sulfite is disposed between the thread-engaging fastener and the output terminal of the transducer assembly. An electrical connection including an external output terminal and the transducer output terminal is provided for defining an electric circuit having a series-connection of electrostatic capacitances of the insulating washer and the low-friction washer and an electrostatic capacitance of the piezoelectric element connected in parallel to the series-connected capacitances. The electrical connection may comprise a vibration-absorbing flexible conductor between the external output terminal and the output terminal of the acceleration transducer assembly.
REFERENCES:
patent: 4254354 (1981-03-01), Keem
patent: 4399705 (1983-08-01), Weiger et al.
patent: 4574616 (1986-03-01), Miura et al.
patent: 4637246 (1987-01-01), Lombard et al.
patent: 4840158 (1989-06-01), Komurasaki
patent: 4966031 (1990-10-01), Mochizuki
patent: 4967114 (1990-10-01), Komurasaki et al.
Katoh Shoiti
Komurasaki Satosi
Chapman John E.
Mitsubishi Denki K.K.
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