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:
Jan. 08, 2008
Filed:
Nov. 23, 2004
Hitoshi Goka, Aichi, JP;
Hitoshi Goka, Aichi, JP;
Jatco Ltd, Shizuoka, JP;
Abstract
In a speed change control system of an automatic transmission incorporated with an engine, there are provided a speed change mechanism that is able to establish a forward speed or a reverse by engaging a hydraulically operated friction element upon switching of the transmission from a non-travel range to a travel range; and a control unit that controls the hydraulically operated friction element in such a manner that a hydraulic pressure applied to the friction element is feedback controlled in such a manner that when the engine is under a lower load condition, a rate of speed change of rotation of an input shaft of the transmission has a first target rate. The control unit is configured to set the rate of speed change of the input shaft to a second target rate smaller than the first target rate when, upon switching of the transmission from the non-travel range to the travel range, the engine is under a higher load condition; and configured to control the hydraulic pressure of the friction element in a feedback control manner so that the rate of speed change of the input shaft has the second target rate.