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. 17, 1990
Filed:
Mar. 01, 1988
Keiji Boda, Hiroshima, JP;
Kouichirou Waki, Mihara, JP;
Kazuo Niide, Hiroshima, JP;
Hiroaki Yokota, Higashi-Hiroshima, JP;
Keizo Yanagisawa, Fuji, JP;
Hokuto Takeuchi, Fujinomiya, JP;
Mazda Motor Corporation, Hiroshima, JP;
Japan Automatic Transmission Co., Ltd., Fuji, JP;
Abstract
An automatic transmission including a torque converter and a multiple stage transmission gear mechanism. A hydraulically actuated brake and a hydraulically actuated clutch is provided for alternate engagement to select alternately one of two adjacent gear stages. In order to prevent gear shift shock, the engaging of the clutch or the brake is controlled so that the engaging rate is faster for a predetermined time period in an initial period of a gear shifting operation than in a remainder period. A control circuit is provided to monitor the gear shifting operation and modifying the predetermined time period in accordance with the results of the latest gear shifting operation and store the modified value for the use in a next gear shifting operation.