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Title:
HYDRAULIC CONTROL SYSTEM FOR AUTOMATIC TRANSMISSION
Document Type and Number:
WIPO Patent Application WO/2007/077665
Kind Code:
A1
Abstract:
Provided is a hydraulic control system (20) comprising a manual shift valve (23) for outputting a forward range pressure (PD) or a reverse range pressure (PR), and a linear solenoid valve (SL4) for outputting an apply pressure to a hydraulic servo (54) of a fourth clutch (C-4) to be applied at a reverse time. The hydraulic control system (20) further comprises a C-4 relay valve (45) interposed between the linear solenoid valve (SL4) and the hydraulic servo (54). The C-4 relay valve (45) is locked, when it inputs a signal pressure of a solenoid valve (SL), at a normal position thereby to provide the communication of the apply pressure from the linear solenoid valve (SL4), with the hydraulic servo (54), and is switched, when deenergized in failure, to a fail position by the reverse range pressure (PR) thereby to provide the communication of the reverse range pressure (PR) with the hydraulic servo (54). As a result, a reverse gear can be established, even in failure when the solenoid valve (SL) to be energized for the reverse gear at a normal time is deenergized.

Inventors:
SATO NOBUHIRO (JP)
YAMAGUCHI TETSUYA (JP)
NODA KAZUYUKI (JP)
FUKATSU AKIRA (JP)
IWASE MIKIO (JP)
NOZAKI KAZUTOSHI (JP)
HONDA ATSUSHI (JP)
Application Number:
PCT/JP2006/321210
Publication Date:
July 12, 2007
Filing Date:
October 25, 2006
Export Citation:
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Assignee:
AISIN AW CO (JP)
TOYOTA MOTOR CO LTD (JP)
SATO NOBUHIRO (JP)
YAMAGUCHI TETSUYA (JP)
NODA KAZUYUKI (JP)
FUKATSU AKIRA (JP)
IWASE MIKIO (JP)
NOZAKI KAZUTOSHI (JP)
HONDA ATSUSHI (JP)
International Classes:
F16H61/12; F16H61/68; F16H61/684; F16H59/08; F16H61/686
Foreign References:
JPH0914425A1997-01-14
JPH09303547A1997-11-25
JPH0914430A1997-01-14
JPH0842681A1996-02-16
Attorney, Agent or Firm:
CHIKASHIMA, Kazuo (9-7 Shibaura 1-chome, Minato-k, Tokyo 23, JP)
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