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:
Dec. 13, 1988
Filed:
Dec. 14, 1987
Applicant:
Inventor:
Yukio Hamano, Toyota, JP;
Assignee:
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B60K / ;
U.S. Cl.
CPC ...
74866 ; 74864 ;
Abstract
In the control of a vehicle automatic transmission having a series connection of an overdrive gear mechanism and an underdrive gear mechanism, the overdrive gear being switched over between direct connection and overdrive both when the underdrive gear mechanism is switched to direct connection and to speed reduction, a maximum limit is set for the period over which the overdrive gear mechanism is switched to overdrive while the underdrive gear mechanism is switched to speed reduction, such a maximum period being determined according to a vehicle operational parameter such as vehicle speed, throttle opening or transmission fluid temperature.