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:
Jul. 08, 2025
Filed:
Apr. 17, 2024
Mazda Motor Corporation, Hiroshima, JP;
Yuki Tsuchitori, Aki-gun, JP;
Manabu Sasahara, Aki-gun, JP;
Makoto Yamada, Aki-gun, JP;
Masato Ohtani, Aki-gun, JP;
Shigeru Nagayama, Aki-gun, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
An automatic transmission control system includes an automatic transmission provided with a first friction engagement element including friction plates, a piston movable between engaged and disengaged positions for engaging and disengaging, respectively, the friction plates, and engaging and disengaging hydraulic pressure chambers applying engaging and disengaging hydraulic pressure for setting the piston at the engaged and disengaged positions, respectively, first and second hydraulic pressure control valves which adjust the engaging and disengaging hydraulic pressure, respectively, and a controller which controls the first and second hydraulic pressure control valves. When disengaging the engaged first friction engagement element, the controller performs a first control to the first hydraulic pressure control valve to raise the engaging hydraulic pressure, a second control to the second hydraulic pressure control valve to then raise the disengaging hydraulic pressure, and a third control to the first hydraulic pressure control valve to then reduce the engaging hydraulic pressure.