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:
Jan. 28, 2014
Filed:
Oct. 26, 2011
Fumitaka Nagashima, Fuji, JP;
Hajime Tasaka, Fuji, JP;
Takateru Kawaguchi, Susono, JP;
Takeo Aizawa, Hachioji, JP;
Kakuzou Kaneko, Ebina, JP;
Fumitaka Nagashima, Fuji, JP;
Hajime Tasaka, Fuji, JP;
Takateru Kawaguchi, Susono, JP;
Takeo Aizawa, Hachioji, JP;
Kakuzou Kaneko, Ebina, JP;
JATCO Ltd, Fuji-shi, JP;
Abstract
An automatic transmission has a transmission control section performing a control so that a transmission ratio defined as input rpm/output rpm of the automatic transmission becomes a target transmission ratio, a slip control section slip-controlling a frictional engagement element in the automatic transmission so that the input rpm becomes a value obtained by multiplying the output rpm by the target transmission ratio also adding a predetermined slip revolution speed; and an abnormality judgment section judging abnormality in the automatic transmission. When the slip-control is not in progress, if an actual transmission ratio is out of a predetermined range of the target transmission ratio, the abnormality judgment section judges that abnormality occurs. When the slip-control is in progress, if a value obtained by correcting the actual transmission ratio on the basis of the slip revolution speed is out of the predetermined range, the abnormality judgment section judges that abnormality occurs.