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. 23, 1993
Filed:
Oct. 29, 1990
Shigeki Goto, Kariya, JP;
Masato Shimei, Nagoya, JP;
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Abstract
A shift control apparatus for an automatic transmission includes a kickdown orifice control valve for changing over two systems of hydraulic-pressure supply lines which supply hydraulic pressure to friction engaging elements on an engaging side via at least one orifice by sliding a spool between a first position at which the spool is urged by a spring and a second position at which the spool is urged by changeover hydraulic pressure acting in a direction opposite the spring, a solenoid valve mounted at a point along a line which introduces the changeover hydraulic pressure, and control means for controlling opening and closing of the solenoid valve, e.g., by duty-control or timer. Duty control is made according to vehicle velocity and throttle opening and corrected according to the engine rotational state.