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:
Nov. 17, 2009
Filed:
Dec. 22, 2006
Takayuki Hayashi, Anjo, JP;
Tetsuya Yamaguchi, Anjo, JP;
Kazuyuki Noda, Handa, JP;
Minoru Todo, Takahama, JP;
Kazuhisa Ozaki, Aichi-ken, JP;
Kazutoshi Nozaki, Aichi-ken, JP;
Atsushi Honda, Seto, JP;
Takayuki Hayashi, Anjo, JP;
Tetsuya Yamaguchi, Anjo, JP;
Kazuyuki Noda, Handa, JP;
Minoru Todo, Takahama, JP;
Kazuhisa Ozaki, Aichi-ken, JP;
Kazutoshi Nozaki, Aichi-ken, JP;
Atsushi Honda, Seto, JP;
Aisin AW Co., Ltd., Aichi-ken, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi-ken, JP;
Abstract
A hydraulic control apparatus for a multi-stage automatic transmission includes solenoid valves such as the linear solenoid valves that are formed as normally closed valves. A first clutch apply relay valves that outputs a forward range pressure as a reverse input pressure during an all-solenoid-off mode, and a second clutch apply relay valve that switches between a left half position that inputs a reverse input pressure to a discharge port and a right half position that inputs the reverse pressure to the discharge port are provided. The second clutch apply relay valve is set to the right half position during normal engine startup and locked based on the lock pressure by feeding the line pressure as a lock pressure and is set at the left half position that interrupts the lock pressure after the engine is restarted during all-solenoids-off.