title: Knocking Detection of a Gasoline Engine by Utilizing an Optical Fiber with Specific Refractive-index Composition.
abstract: 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.
authors.forename: M
authors.initials: M
authors.lastname: Komachiya
authors.forename: H
authors.initials: H
authors.lastname: Sonobe
authors.forename: T
authors.initials: T
authors.lastname: Fumino
authors.forename: T
authors.initials: T
authors.lastname: Sakaguchi
authors.forename: K
authors.initials: K
authors.lastname: Kawakami
authors.forename: S
authors.initials: S
authors.lastname: Watanabe
authors.forename: T
authors.initials: T
authors.lastname: Sasayama