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:
Sep. 17, 2013
Filed:
Aug. 27, 2010
Tatsuya Sahashi, Anjo, JP;
Shin-ichirou Murakami, Okazaki, JP;
Masaki Nishide, Okazaki, JP;
Tatsuya Oba, Nishio, JP;
Tatsuya Sahashi, Anjo, JP;
Shin-ichirou Murakami, Okazaki, JP;
Masaki Nishide, Okazaki, JP;
Tatsuya Oba, Nishio, JP;
Aisin AW Co., Ltd., Anjo, JP;
Abstract
In an operation of controlling an automatic transmission, an engagement pressure for each hydraulic servo in a normal operation is determined so that none of friction engagement elements slips at each shift speed in the normal operation, and so that in case of a failure in which the friction engagement element that is supposed to be disengaged in the normal operation is engaged, one of the friction engagement elements slips, and thus one of the shift speeds is established. In the control operation, upon detection of a failure state in which a gear ratio after a shift operation is a gear ratio of a shift speed different from a shift speed to be established, the slipping friction engagement element is disengaged, and the shift speed that is different from the shift speed to be established is temporarily retained.