Measuring and testing – Engine detonation – Combustion signal compared to reference signal varied by a...
Patent
1989-05-19
1990-08-07
Chapman, John
Measuring and testing
Engine detonation
Combustion signal compared to reference signal varied by a...
310329, G01L 2322
Patent
active
049457551
ABSTRACT:
An acceleration or knocking detector for a vehicle engine includes an electrically conductive bushing 24 mounted to the engine, and an acceleration transducer assembly disposed on the bushing and including a piezoelectric element 31, an inertial weight 34, an output electrode 31a, and a ground electrode 31b in contact with the bushing. An output terminal 29a is connected to the output electrode of the transducer assembly and extends through the housing for external connection to a grounded control unit 38, and a ground terminal 29b electrically connected to the ground electrode of the transducer assembly also extends through the housing for connection to the control unit, thus establishing parallel ground paths. An electrical conduction maintaining element such as a bonding agent, tape, washer or grease is disposed between the bushing and the engine to establish and maintain good conduction therebetween for a prolonged time.
REFERENCES:
patent: 3307054 (1967-02-01), Shoor
patent: 4225302 (1980-09-01), Suzuki et al.
patent: 4399705 (1983-08-01), Weiger et al.
patent: 4637246 (1987-01-01), Lombard et al.
patent: 4660409 (1987-04-01), Miyata et al.
Chapman John
Mitsubishi Denki & Kabushiki Kaisha
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