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. 21, 2012
Filed:
Aug. 03, 2009
Jun Yoshino, Fuji, JP;
Masaya Kubota, Fuji, JP;
Jun Yoshino, Fuji, JP;
Masaya Kubota, Fuji, JP;
JATCO Ltd, Fuji-shi, JP;
Abstract
A control apparatus for an automatic transmission includes a shift control section configured to perform a shift of the automatic transmission; and a judder judging section. The shift control section is configured to judge whether or not a progress of the shift is during an inertia phase. The judder judging section calculates a characteristic-gradient index value which is a value obtained by quantifying a phenomenon that appears as a relative rotational speed between input and output of the first friction-engagement element becomes reduced with a progress of the inertia phase. The phenomenon appears in a different way in dependence upon whether a relational characteristic of a friction coefficient of the first friction-engagement element with respect to the relative rotational speed is a positive-gradient characteristic or a negative-gradient characteristic. The judder judging section determines that the judder has occurred based on the characteristic-gradient index value.