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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.:

US 10316960 B1

PDFFull Text
Date of Patent:
Jun. 11, 2019

Filed:

May. 16, 2017

Method and device for controlling automatic transmission

Applicant:

Mazda Motor Corporation, Aki-gun, Hiroshima, JP;

Inventors:

Yutaro Fukuda, Hiroshima, JP;

Manabu Sasahara, Hiroshima, JP;

Tadashi Saito, Hiroshima, JP;

Tomohiro Kubo, Hiroshima, JP;

Assignee:

Mazda Motor Corporation, Aki-gun, Hiroshima, JP;

Attorney:

Alleman Hall Creasman & Tuttle LLP

Primary Examiner:

Justin Holmes

Int. Cl.
CPC ...
F16H 61/02 (2006.01); F16D 25/0638 (2006.01); F16D 25/10 (2006.01); F16D 48/06 (2006.01); F16H 61/00 (2006.01); F16H 61/30 (2006.01); F16H 63/30 (2006.01); F16H 61/28 (2006.01); F16D 48/02 (2006.01); F16H 3/66 (2006.01); F16H 57/10 (2006.01); F16H 59/18 (2006.01); F16H 59/36 (2006.01); F16H 59/54 (2006.01); F16H 59/70 (2006.01); F16H 59/72 (2006.01); F16H 3/44 (2006.01); F16H 59/68 (2006.01);
U.S. Cl.
CPC ...
F16H 61/0204 (2013.01); F16D 25/0638 (2013.01); F16D 25/10 (2013.01); F16D 48/02 (2013.01); F16D 48/062 (2013.01); F16H 61/0021 (2013.01); F16H 61/0206 (2013.01); F16H 61/2807 (2013.01); F16H 61/30 (2013.01); F16H 63/3026 (2013.01); F16D 2500/308 (2013.01); F16H 3/66 (2013.01); F16H 57/10 (2013.01); F16H 59/18 (2013.01); F16H 59/36 (2013.01); F16H 59/54 (2013.01); F16H 59/70 (2013.01); F16H 59/72 (2013.01); F16H 61/0251 (2013.01); F16H 2003/442 (2013.01); F16H 2059/683 (2013.01); F16H 2063/303 (2013.01); F16H 2200/006 (2013.01); F16H 2200/2012 (2013.01); F16H 2200/2043 (2013.01);
Abstract

A method of controlling an automatic transmission is provided. The automatic transmission includes a piston having first and second surfaces opposite from each other, friction plates, engaging and disengaging hydraulic pressure chambers for supplying and discharging hydraulic pressure and directing the piston to push the friction plates to be engaged and disengaged, a hydraulic pressure control valve for supplying and discharging hydraulic pressure to and from the chambers, first and second oil paths communicating the valve with the chambers, and a pressure reducing valve disposed in the second oil path and for preventing hydraulic pressure of the disengaging hydraulic pressure chamber from exceeding a given set pressure. The second surface has a larger area for receiving hydraulic pressure than an area of the first surface for receiving hydraulic pressure. The method includes changing the given set pressure according to information regarding a state of the automatic transmission.

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