Invention Grant
- Patent Title: Rolling downhill shift control of a transmission
- Patent Title (中): 变速箱的下坡换档控制
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Application No.: US14529401Application Date: 2014-10-31
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Publication No.: US09291260B1Publication Date: 2016-03-22
- Inventor: Brandon Fell , Craig J. Hawkins
- 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: F16H61/688
- IPC: F16H61/688 ; F16H61/02 ; F16H61/16 ; F16H61/04

Abstract:
A method of controlling a downhill rolling shift sequence (DRSS) of a vehicle having an engine and a dual-clutch transmission (DCT) includes initiating a DRSS upon detecting a rolling downhill condition of the vehicle in an initial gear state, identifying an exit gear state corresponding to the initial gear state, shifting the DCT to a rolling neutral state when a speed of an initial gear input shaft is equal to an idle speed of the engine, initiating synchronization of the engine speed with the speed of an exit gear input shaft when the shaft speed is equal to the engine idle speed, and shifting the DCT from the rolling neutral state to the exit gear state when the synchronized speed of the engine and the exit gear input shaft is equal to a calibrated exit speed defined by the exit gear state. A system for controlling the DRSS is provided.
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