Knocking Detection of a Gasoline Engine by Utilizing an Optical Fiber with Specific Refractive-index Composition.
1998
Abnormal combustion of a gasoline engine is often accompanied by a
sharp metallic noise called knocking. A recently proposed method of
in-cylinder pressure measurement is applied to detect the knocking,
where the bending power loss of a single-mode fiber with specific
refractive-index composition is utilized. The high-frequency
response of a prototype sensor is obtained with a small structure to
utilize the bending mechanism that is installed into an engine head
gasket. Knocking signals are detected in a wide range of trace- to
heavy-knock conditions.
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