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. 23, 1989
Filed:
Mar. 30, 1987
Koichi Yamamoto, Hiroshima, JP;
Fumiaki Baba, Higashihiroshima, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
A control system for an automatic transmission employed in a vehicle comprises a torque converter coupled with an engine, power transmitting gear arrangement disposed at an output end of the torque converter, a speed change mechanism for giving rise to speed change in the power transmitting gear arrangement, a fluid servo control device having an applying chamber and a releasing chamber to each of which a fluid is supplied and operative to cause the speed change mechanism to work, and an additional control device for controlling the fluid servo control device under a situation in which the fluid in the releasing chamber of the fluid servo control device is so controlled as to have one of speeds in the power transmitting gear arrangement. The fluid servo control device is controlled by the additional control device to be in a first condition wherein the fluid is supplied to the applying chamber and in a second condition wherein the fluid is drained from the applying chamber selectively in response to the operating condition of the engine or the travelling condition of the vehicle.