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:
Jul. 01, 1997
Filed:
Feb. 13, 1996
Atsushi Tabata, Okazaki, JP;
Nobuaki Takahashi, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
An apparatus for controlling an automatic transmission of a motor vehicle wherein two hydraulically operated frictional coupling devices are released and engaged, respectively, to effect a clutch-to-clutch shift-up action of the transmission, and a shift-up boundary line for determining whether the shift-up action should take place is compensated by a learning shift-point compensating device, so as to prevent a rise of the vehicle engine above an upper limit during the shift-up action effected according to the compensated shift-up boundary line, the apparatus including an inhibiting device for inhibiting an operation of the learning shift-point compensating device if an amount of overshoot of the engine speed detected during the shift-up action is larger than a predetermined threshold. The apparatus may further includes a pressure compensating device for compensating a releasing pressure of the above-indicated one frictional coupling device, and a compensating coordinating device for controlling one of the shift-point and hydraulic pressure compensating devices depending upon an effect achieved or expected to be achieved by the other compensating device.