Magnetostrictive engine detonation sensor

Details Magnetostrictive engine detonation sensor Magnetostrictive engine detonation sensor

1977-12-27

1979-07-17

Budd, Mark O.

Electrical generator or motor structure

Dynamoelectric

Reciprocating

73 35, 73DIG2, H01L 4106

Patent

active

041616650

ABSTRACT:
A sensor for engine vibrations at a predetermined frequency characteristic of detonation comprises a housing adapted at one axial end for attachment to an internal combustion engine, a magnetostrictive element axially compressed in said housing with a source of permanent magnetic flux and a pickup coil on a spool around the magnetostrictive element. The spool engages the magnetostrictive element in a force fit characterized by a predetermined push-out force. The sensor housing comprises a first resonant assembly having a first resonant frequency slightly higher than the predetermined frequency. The spool and coil are coupled to the magnetostrictive element by the force fit to comprise a second resonant assembly having a second resonant frequency slightly lower than the predetermined frequency. The overall output characteristic of the sensor thus has a single resonant peak at substantially the predetermined frequency.

REFERENCES:
patent: 2269760 (1942-01-01), Eldredge
patent: 2275675 (1942-03-01), Draper et al.
patent: 2435031 (1948-01-01), Burns et al.
patent: 2445318 (1948-07-01), Eldredge et al.
patent: 2534276 (1950-12-01), Lancor, Jr.
patent: 2814742 (1957-11-01), Tognola
patent: 2826706 (1958-03-01), Sackett
patent: 2978670 (1961-04-01), Peek, Jr.

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