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Method for controlling the shifting of an automatic geared transmission

  • US 8,781,698 B2
  • Filed: 08/03/2011
  • Issued: 07/15/2014
  • Est. Priority Date: 09/24/2010
  • Status: Active Grant
First Claim
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1. A method of controlling shifts in an automated multi-step variable-speed transmission, in a drive-train of a motor vehicle, arranged between a drive engine and an axle drive, the method comprising the steps of:

  • determining, while driving, current operating parameters of the motor vehicle, including vehicle, road and driver-specific operating parameters, and topographical data including a height profile of a road section ahead of the motor vehicle;

    determining a driving resistance profile (FFW(xF)) of the motor vehicle for the road section ahead and from the current operating parameters operating parameters, and the topographical data including the height profile of the road section ahead;

    determining from the driving resistance profile (FFW(xF)) for the road section ahead and from operating parameters of the drive engine and the multi-step variable-speed transmission, a limiting gear progression (GGr(xF)) which comprises a sequence of respective gears in which traction force of the drive engine acting on drive wheels of the motor vehicle is, in each case, larger than the driving resistance profile ((FFW(xF));

    deriving control commands, during traction operation of the multi-step variable-speed transmission in the automatic mode, for at least one of traction upshifts and traction downshifts as a function of the limiting gear progression (Ggr(xF)); and

    implementing the control commands, via a transmission control system, for the at least one of the traction upshifts and traction downshifts.

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