Apparatus for detecting pressure fluctuations in the combustion

Details Apparatus for detecting pressure fluctuations in the combustion Apparatus for detecting pressure fluctuations in the combustion

1980-07-11

1981-12-29

Myracle, Jerry W.

Measuring and testing

Engine detonation

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

73115, G01L 2322

Patent

active

043076033

ABSTRACT:
An apparatus serving to detect pressure fluctuations in the combustion chamber of an internal combustion engine, including an ionic current sensor, which is exposed to the gases in the combustion chamber and comprises a first electrode and a second electrode, between which a measurement voltage is applied and between which a connecting channel extends from the open combustion chamber into a dead space. In this manner, ionic currents may be detected which are caused by fluctuating pressures in the combustion chamber, particularly when there is engine knocking. Particularly when the geometry of the dead space is adapted to the frequency of the pressure fluctuations which are to be measured, these pressure fluctuations can be detected independently of other, slower pressure variations in the form of a pulsating current which is large when the ion-carrying gas enters the dead space and small when this gas, by now strongly deionized, exits the dead space.

REFERENCES:
patent: 1547918 (1925-07-01), Howard
patent: 2861014 (1958-11-01), Sheheen et al.
patent: 3030799 (1962-04-01), Hopkins
patent: 3343366 (1967-09-01), Siegler et al.
patent: 3921605 (1975-11-01), Wyczalek

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