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:
Oct. 24, 1995
Filed:
Sep. 30, 1993
Masakatsu Fujishita, Mito, JP;
Masahiro Sato, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Automotive Engineering Co., Ltd., Ibaraki, JP;
Abstract
An engine knocking detection method for detecting a knocking from a plurality of characteristic frequency components indicative of a knocking condition is provided. False information indicating a false knock occurrence due to an abnormal drop of the background level to be compared with the characteristic components is eliminated. Information indicating an occurrence of a knocking is extracted through comparison of the characteristic components and corresponding background levels. The background levels are compared with corresponding lower limiters when no knocking is taking place. When any one of the background levels is smaller than a lower limiter corresponding thereto, the lower limiter is adopted and set as a new background levels drops abnormally, a corresponding lower limiter thereof is effected to replace the faulty background level, thereby false information indicating the occurrence of a false knocking is prevented from being generated.