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Method for controlling an automatic transmission

  • US 6,442,467 B1
  • Filed: 03/22/2001
  • Issued: 08/27/2002
  • Est. Priority Date: 09/28/1998
  • Status: Expired due to Term
First Claim
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1. A method of controlling of an automatic transmission having several gears controlled by an electronic control device in which a performance control device is provided for load input and a signal (DKI) dependent on a position of a performance control device is detected and a gradient signal (DKIG) proportional to a speed change is formed therefrom, the electronic control device storing at least one shifting characteristic line for each gear change, a shifting characteristic line being associated with every position of the performance control device, and triggering a downshift to a lower gear when, in the actuation of the performance control device, a shifting characteristic line is exceeded in a sense of increased load input, the method comprising the steps of:

  • comparing the gradient signal (DKIG) with a presettable threshold value (DKG_Limit) and triggering a downshift before exceeding a characteristic line when the actual value of the gradient signal is greater than the threshold value; and

    interrupting the downshift when the actual value of the gradient signal falls below one other threshold value before the shifting characteristic line is exceeded.

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