Invention Grant
US08500600B2 Hydraulic control system for an automatic transmission having a manual valve with a two gear default strategy
有权
一种自动变速器的液压控制系统,具有双档默认策略的手动阀
- Patent Title: Hydraulic control system for an automatic transmission having a manual valve with a two gear default strategy
- Patent Title (中): 一种自动变速器的液压控制系统,具有双档默认策略的手动阀
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Application No.: US12987715Application Date: 2011-01-10
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Publication No.: US08500600B2Publication Date: 2013-08-06
- Inventor: Steven P. Moorman
- Applicant: Steven P. Moorman
- Applicant Address: US MI Detroit
- Assignee: GM Global Technology Operations LLC
- Current Assignee: GM Global Technology Operations LLC
- Current Assignee Address: US MI Detroit
- Main IPC: F16H61/26
- IPC: F16H61/26

Abstract:
A hydraulic control system for a transmission includes a source of pressurized hydraulic fluid, a manual valve, and a default valve. A first set of solenoids are configured to selectively engage at least one of a plurality of shift actuators. The first set of solenoids is open when de-energized. A second set of solenoids is configured to selectively engage at least one of the plurality of actuators. The second set of solenoids is closed when de-energized. A low speed default gear is engaged when the first and second sets of solenoids are de-energized and the transmission is operating in a low speed gear ratio. A high speed default gear ratio is engaged when the first and second sets of solenoids are de-energized and the transmission is operating in a high speed gear ratio.
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