Vibration sensors for internal combustion engines

Details Vibration sensors for internal combustion engines Vibration sensors for internal combustion engines

1979-08-20

1981-05-12

Gill, James J.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

73 35, G01H 312, G01M 1500, G01N 3322

Patent

active

042664217

ABSTRACT:
Several embodiments and mountings of a vibration sensor are disclosed, all of which are suitable for detecting vibrations diagnostic of a combustion in a combustion chamber of a liquid cooled internal combustion engine. The channel for collection and transmission of these vibrations from the combustion chamber to the sensor in each embodiment includes the liquid engine coolant. In some of the embodiments, the sensor detects flexure of portions of the walls of the existing structure of the engine cooling system apart from the primary rigid structure of the engine. Dimensions of coolant system passages may be modified to tune or emphasize certain frequencies delivered to a sensor. To improve signal to noise ratio of the dignostic vibrations seen by the sensor, portions or extensions of the cooling system may be damped or silenced, or alternatively, damping or silencing may be applied to the entire cooling system. To the extent damping is applied, it additionally may result in reduced noise coupled to the atmosphere as occurs particularly via the large areas of the liquid to air heat exchanger surfaces.

REFERENCES:
patent: 1907415 (1933-05-01), Carpenter et al.
patent: 2164638 (1939-07-01), Broeze et al.
patent: 2233804 (1941-03-01), Bourne
patent: 2403774 (1946-07-01), Whitty et al.

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