The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 22, 2023
Filed:
Apr. 24, 2020
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Tien Trien Le, Kanagawa, JP;
Hisashi Yokoyama, Ibaraki, JP;
Satoshi Inose, Ibaraki, JP;
Shogo Kunioka, Ibaraki, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
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