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. 24, 2009
Filed:
Dec. 22, 2006
Nobuhiro Sato, Anjo, JP;
Tetsuya Yamaguchi, Anjo, JP;
Kazuyuki Noda, Handa, JP;
Akira Fukatsu, Anjo, JP;
Mikio Iwase, Anjo, JP;
Kazutoshi Nozaki, Aichi-ken, JP;
Atsushi Honda, Seto, JP;
Nobuhiro Sato, Anjo, JP;
Tetsuya Yamaguchi, Anjo, JP;
Kazuyuki Noda, Handa, JP;
Akira Fukatsu, Anjo, JP;
Mikio Iwase, Anjo, 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 an automatic transmission is provided with a solenoid valve that outputs a signal pressure during a failure and does not output a signal pressure during normal operation and a first clutch apply relay valve that switches between a normal position (the right half position) and a fail position (the left half position) based on this signal pressure are provided. During a failure, fail-safe control is carried out by the first clutch apply relay valve switching to the fail position. The first clutch apply relay valve inputs the engagement pressure of the hydraulic servo from the linear solenoid valve when in the normal position, and is locked in the normal position. Thereby, while the first clutch is engaged, the second brake apply control valve can be switched by the signal pressure of the solenoid valve.