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:
Apr. 29, 2014
Filed:
Oct. 07, 2009
Hitoshi Adachi, Osaka, JP;
Takeshi Takahashi, Osaka, JP;
Isao Takagawa, Osaka, JP;
Yanmar Co., Ltd., Osaka, JP;
Abstract
Provided is an engine rpm control device which gradually reduces the output speed of an engine drive object when reducing the engine rpm. The engine rpm control device () includes a target engine rpm correction means used upon detection of an engine failure. The target engine rpm correction means has a storage device () containing a map of the correlation characteristic between the engine rpm and the output speed of object to be driven by an engine (). The target engine rpm correction means corrects the target engine rpm so that an instructed engine rpm (Nset) or a derating target engine rpm (Nset') is shifted to a predetermined failure-preventing engine rpm (N) while maintaining the reduction ratio of the output speed of the drive object at a predetermined ratio.