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:
Feb. 18, 1992
Filed:
Jan. 25, 1991
Shinya Kamada, Hiroshima, JP;
Hidehiko Mishima, Hiroshima, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
A hydraulic control system shifts an automatic transmission into at least a reverse range and a drive range having several forward speed gears by selectively coupling a plurality of frictional coupling elements, including a reverse coupling element. The control system includes a throttle, such as an orifice, for regulating hydraulic pressure applied to the reverse coupling element. A bypass circuit is provided in the control system for applying the hydraulic pressure, bypassing the throttle, to the reverse coupling element. The bypass circuit is opened when a specific operating condition of the automatic transmission of an engine is created, so as to apply the hydraulic pressure through the bypass circuit to the reverse coupling element to rapidly achieve a coupling of the reverse coupling element.