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. 02, 1993
Filed:
May. 21, 1990
Applicant:
Inventor:
Shigeki Goto, Kariya, JP;
Assignee:
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16H / ; B60K / ;
U.S. Cl.
CPC ...
74866 ; 74856 ; 3644241 ;
Abstract
An hydraulic control device for an automatic transmission includes a plurality of controlling valves connected to related friction engaging elements. A plurality of solenoid valves are connected to the controlling valves for supplying hydraulic pressure thereto. A checking device determines whether an upshift of the transmission is performed or not. A detector determines a detected value of either a RPM count of an engine of the vehicle or a longitudinal acceleration of the vehicle. A fail-safe device prevents the upshift based on a comparison of the detected value with a predetermined value.