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:
Feb. 11, 2003
Filed:
Jan. 04, 2002
Kazuhiro Takatori, Fuji, JP;
Osamu Sato, Fuji, JP;
Yasushi Fujita, Fuji, JP;
Tatsuya Imamura, Fuji, JP;
Jatco Transtechnology Ltd., , JP;
Abstract
In an automatic transmission performing change-over of a first engaging element and a second engaging element between two gear positions, for example between the fourth gear and the fifth gear, an oil pressure command value A to one of these two engaging elements is retained as a current value “a” and an oil pressure command value B to the other of these two engaging elements is retained as a current value “b” and at the same time the calculation of a calculation value of a downshift form the fifth gear is started when a target gear position changes to the fourth gear or lower during upshift between the two gear positions. When downshift calculation values Ad, Bd reach the retained values “a”, “b”, the oil pressure command values A, B are switched to the downshift calculation values. Thereby, a timing for performing the change-over of respective engaging elements is properly achieved, and a downshift to the fourth gear can be promptly performed before the upshift is not finished, and shift shock and engine racing can be prevented.