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Transmission detent shift control with acceleration-based compensation

  • US 5,245,893 A
  • Filed: 10/02/1992
  • Issued: 09/21/1993
  • Est. Priority Date: 10/02/1992
  • Status: Expired due to Term
First Claim
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1. In a motor vehicle powertrain having an engine connected to drive a vehicle through an automatic shift transmission, the powertrain operating in a detent mode when an engine load indicator exceeds a predefined threshold, a method of operation for initiating upshifting of said transmission during said detent mode, comprising the steps of:

  • measuring an acceleration of said engine;

    retrieving a delay time from a table of empirically determined time intervals corresponding to a period between initiation of an upshift and achievement of a peak engine speed during such upshift;

    determining an engine speed change which is expected to occur in the course of said retrieved delay time based on said measured acceleration;

    developing a trigger speed reference in relation to a difference between said determined engine speed change and a limit speed of said engine; and

    initiating an upshift of said transmission when said engine achieves a speed at least as great as said trigger speed reference, whereby the peak engine speed achieved during said upshift substantially coincides with said limit speed of said engine.

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