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:
Jul. 17, 2012
Filed:
Oct. 16, 2008
Yo Akiyama, Nagasaki-ken, JP;
Akihiko Yano, Nagasaki-ken, JP;
Junichi Kaga, Kanagawa-ken, JP;
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
Abstract
A method of monitoring deterioration of lubricating oil and a device therefore capable of judging deterioration of the oil with high accuracy suppressing measurement error due to mixing of foreign matter in the oil. Correlation between relative permittivity and TBN (total base number) of the lubricating oil is obtained beforehand (step S), electric current and voltage are measured (step S) when high-frequency voltage is applied between a pair of electrodes located in an oil path in a gas engine, permittivity of the oil is detected (step S) based on the measurement of current and voltage, TBN of the oil is obtained (step S) from the correlation between relative permittivity and TBN, and deterioration of the oil is judged by the obtained value of TBN.