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:
May. 31, 1994
Filed:
Jun. 15, 1992
Hideo Koyama, Shinjuku, JP;
Nobuo Takemasa, Wako, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An automatic transmission has, between input and output shafts, a plurality of power transmitting paths composed of combinations of planetary gear trains, and a plurality of engaging units for selecting one of the power transmitting paths for establishing a desired gear position. An upshift is effected from a present gear position to a target gear position which is higher than the present gear position through disengagement of two engaging units and engagement of two other engaging units. A controlling intermediate gear position is selected which is higher than the target gear position and which can be shifted to from the present gear position and the target gear position only through disengagement of one of the engaging units and engagement of another of the engaging units. When an upshift command is issued, the transmission starts shifting from the present gear position to the controlling intermediate gear position. The rotating condition of the gear trains is detected after the shifting from the present gear position to the controlling intermediate gear position is started. When the detected rotating condition reaches a rotating condition which substantially corresponds to the target gear position, the transmission is shifted from the controlling intermediate gear position to the target gear position.