Hitachi Construction Machinery Co., Ltd.

Tien Trien Le

Hisashi Yokoyama

Satoshi Inose

Shogo Kunioka

Takahiro Sagara

Inose Satoshi

An injector diagnosis deviceincludes: an engine sound model generatorconfigured to generate a normal engine sound model and an abnormal engine sound model based on the number of cylinders of the engine and a combustion pattern of the engine; an operating sound obtainment unitconfigured to obtain the operating sound of the engine operating with the combustion pattern; a frequency characteristics calculation unitconfigured to calculate the frequency characteristics of the operating sound obtained by the operating sound obtainment unitand an injector diagnosis unitconfigured to diagnose whether or not the injectors have a failure based on the frequency characteristics of the operating sound which is calculated by the frequency characteristics calculation unitand the normal engine sound model and the abnormal engine sound model which is generated by the engine sound model generator

Injector diagnosis device and injector diagnosis method

An injector failure diagnostic devicediagnoses injector failures for a multi-cylinder internal combustion enginehaving injectorsto, each injector injects fuel to the corresponding cylinder. The injector failure diagnostic deviceincludes: an operating sound obtainment unitconfigured to obtain current operating sound that is operating sound when all of the injectors operate, and obtain pseudo-failure operating sound sequentially for each of the injectors, the pseudo-failure sound being operating sound generated by stopping the fuel injection from one injector while maintaining the operation of the remaining injectors; and a faulty injector identification unitconfigured to determine whether or not the pseudo-failure operating sound of each injector obtained by the operating sound obtainment unitis similar to the current operating sound to identify a faulty injector.

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Kanagawa, Japan

Tien Trien Le