Magnetostrictive element for measuring knock in engines

Details Magnetostrictive element for measuring knock in engines Magnetostrictive element for measuring knock in engines

1986-07-07

1988-04-12

Chapman, John

Measuring and testing

Engine detonation

Combustion signal compared to reference signal varied by a...

73DIG2, G01L 2322

Patent

active

047366206

ABSTRACT:
A method and device for measuring combustion knocking in the combustion chamber of an externally-ignited internal combustion engine, the device comprising a magnetostrictive element with a maximum diameter of 2 mm and a length-to-diameter ratio of greater than 100, the device being mounted in the engine so as to be exposed to the combustion chamber. The device can include a coil to which the magnetostrictive element is connected for converting changes in magnetic conductability in the magnetostrictive element, due to pressure increases in the combustion chamber to which it is exposed, into electrical signals. The coil in turn can be connected to an electronic switching system for the engine.

REFERENCES:
patent: 2414457 (1947-01-01), Eldredge et al.
patent: 3089333 (1960-10-01), Kleesattel
patent: 4091656 (1978-05-01), Altemose
patent: 4461178 (1984-07-01), Chamuel

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