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JPS5599042

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DESCRIPTION JPS5599042
Description 1, title of the invention
Detector that detects knock vibration
3. Detailed Description of the Invention The present invention relates to a detector for detecting
vibrations that occur during knocking of an internal combustion engine. It is known that socalled knocking occurs under certain operating conditions in an otto-cycle engine. It is a damped
audio-frequency oscillation of the compressed fuel-air-air mixture induced by the shockwave and
EndPage: 1. During this oscillation the heat transfer to the piston and cylinder walls of the
internal combustion engine is significantly enhanced. To this end this aspect is also thermally
overloaded, harmfully and knocking should be avoided. However, since it is desired to make the
most of the room of the operating mode as much as possible, it is desirable to have a detector
which indicates knocking early and reliably. A well-known detector for this purpose is a
piezoelectric pressure indicator which is screwed into a special hole in the cylinder head of an
internal combustion engine. This type of fixed form is extremely laborious and expensive.
Furthermore, piezoelectric pressure sensors are disadvantageously very temperature dependent.
Also, the detector itself is relatively expensive.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view of a first
embodiment of the detector of the present invention, and FIG. 2 is a schematic cross-sectional
view of the second embodiment. DESCRIPTION OF SYMBOLS 1: .. Pressure ring, 2 ... piezoelectric
plate, 3 ... molding material, 4 ... bolt, 5.7 .. insulator, 6. electric wire, 1 degree .. insertion lug
piece EndPage: 3
04-05-2019
1
04-05-2019
2
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