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:
Oct. 01, 1990
Applicant:
Inventor:
Shigeo Takahashi, Anjo, JP;
Assignee:
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B60K / ;
U.S. Cl.
CPC ...
74868 ; 74867 ; 74869 ;
Abstract
An automatic transmission control system includes a shift valve having a valve body, a spool, a sleeve, a plunger and a return spring. An area of the plunger is acted on by a throttle pressure and is smaller than an area of a land acted on by the throttle pressure. Accordingly, the spool is movable against the throttle pressure to make a upshift when the governor pressure is over a predetermined value in relation to the throttle pressure.