Invention Grant
- Patent Title: Automatic transmission synchronous gear shift
- Patent Title (中): 自动变速器同步换挡
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Application No.: US13742722Application Date: 2013-01-16
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Publication No.: US08900095B2Publication Date: 2014-12-02
- Inventor: Christopher E. Whitney , Christopher Harold Knieper , Ronald W. Van Diepen , Ning Jin , Matthew D. Whitton
- Applicant: GM Global Technology Operations LLC
- Applicant Address: US MI Detroit
- Assignee: GM Global Technology Operations LLC
- Current Assignee: GM Global Technology Operations LLC
- Current Assignee Address: US MI Detroit
- Agency: Quinn Law Group, PLLC
- Main IPC: B60W10/02
- IPC: B60W10/02 ; B60W10/06 ; B60W10/10 ; B60W10/113 ; F16H61/688 ; B60W30/19 ; B60W10/11 ; F16H59/02

Abstract:
A method of commanding a synchronous gear shift begins by receiving a request to shift from a third gear to a first gear, and skipping a second gear having a gear ratio between the gear ratio of the first gear and the gear ratio of the third gear. Subsequently the method includes: reducing a torque command to a predetermined value; opening a clutch disposed on the input shaft of the transmission to decouple the transmission from the engine; transitioning the engine from a torque-control mode into a speed-control mode; commanding the engine to rotate at a speed dictated by the motion of the vehicle and the gear ratio of the first gear; closing the clutch to couple the transmission and the engine; and transitioning the engine back into the torque-control mode.
Public/Granted literature
- US20130310219A1 AUTOMATIC TRANSMISSION SYNCHRONOUS GEAR SHIFT Public/Granted day:2013-11-21
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