Invention Grant
- Patent Title: Hydraulic control device for multi-speed automatic transmission
- Patent Title (中): 液压控制装置,用于多速自动变速器
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Application No.: US12561742Application Date: 2009-09-17
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Publication No.: US08210990B2Publication Date: 2012-07-03
- Inventor: Yuhei Yoshioka , Kazuyuki Noda , Naoki Itazu , Yoshinobu Nozaki
- Applicant: Yuhei Yoshioka , Kazuyuki Noda , Naoki Itazu , Yoshinobu Nozaki
- Applicant Address: JP Aichi-Ken JP Aichi-Ken
- Assignee: Aisin Aw Co., Ltd.,Toyota Jidosha Kabushiki Kaisha
- Current Assignee: Aisin Aw Co., Ltd.,Toyota Jidosha Kabushiki Kaisha
- Current Assignee Address: JP Aichi-Ken JP Aichi-Ken
- Agency: Sughrue Mion, PLLC
- Priority: JP2008-255842 20080930
- Main IPC: F16H61/26
- IPC: F16H61/26

Abstract:
A hydraulic control device for a multi-speed automatic transmission includes friction engagement elements, several hydraulic servos that engage and release the friction engagement elements, solenoid valves for engagement control, and a sorting switch valve that allocates engagement pressure from at least one of the solenoid valves for engagement control to two of the hydraulic servos. The sorting switch is switched between a first position that supplies engagement pressure to one of the two hydraulic servos in at least a Reverse, non-drive range and a specific Forward gear range, and a second position that supplies engagement pressure to the two hydraulic servos in other than the Forward range. The hydraulic control device supplies the engagement pressure to the two hydraulic servos when an all-solenoids-off failure occurs and the sorting switch is in the second position, and cuts off a source pressure to all solenoid valves when an all-solenoids-off failure occurs while the sorting switch valve is in the first position.
Public/Granted literature
- US20100081546A1 HYDRAULIC CONTROL DEVICE FOR MULTI-SPEED AUTOMATIC TRANSMISSION Public/Granted day:2010-04-01
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