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:
Mar. 18, 1997
Filed:
May. 19, 1995
Applicant:
Inventors:
Shinya Kamada, Hiroshima, JP;
Toshihisa Marusue, Hiroshima, JP;
Assignee:
Madza Motor Corporation, Hiroshima-ken, JP;
Primary Examiner:
Int. Cl.
CPC ...
F16H / ;
U.S. Cl.
CPC ...
477 98 ; 477156 ; 477174 ;
Abstract
A hydraulic control system for an automatic transmission includes a three-way duty solenoid valve which is driven at a duty rate to regulate pressure at its input port and develop a controlled pressure at its output port leading to a frictional coupling element for shifting the automatic transmission to a specific mode. The duty rate is changed depending upon driving conditions so that the controlled pressure is forced to reach a desired hydraulic pressure according to driving conditions.