Invention Grant
- Patent Title: Vehicle transmission shift inhibit method and apparatus
- Patent Title (中): 车辆变速箱换档禁止方法和装置
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Application No.: US11684055Application Date: 2007-03-09
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Publication No.: US07957873B2Publication Date: 2011-06-07
- Inventor: William R. Cawthorne , Leonard G. Wozniak
- Applicant: William R. Cawthorne , Leonard G. Wozniak
- 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: G06F7/00
- IPC: G06F7/00 ; G06F17/00

Abstract:
A control method is provided including detecting transmission output speed and a forward and reverse shift request, and executing inhibit limits when the detected speed exceeds a predetermined threshold speed. The inhibit limits slow the output speed to zero upon detection of a shift request at output speeds above the threshold, with a pedal progression map executed upon reaching zero output speed. The limits approach zero output torque as vehicle speed increases, reaching zero at a relatively high speed and simulating a neutral transmission upon a detected shift request at high speed. A vehicle is also provided having a transmission, a sensor for detecting transmission output speed, a sensor for detecting a shift request, and a PCM having an algorithm and a threshold transmission output speed. The algorithm inhibits a shift event in the direction opposite that of vehicle travel upon detection when vehicle speed is greater than the threshold.
Public/Granted literature
- US20080221763A1 VEHICLE TRANSMISSION SHIFT INHIBIT METHOD AND APPARATUS Public/Granted day:2008-09-11
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