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Process for controlling an automatic transmission

  • US 6,263,273 B1
  • Filed: 06/07/1999
  • Issued: 07/17/2001
  • Est. Priority Date: 06/12/1998
  • Status: Expired due to Term
First Claim
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1. A process for controlling an automatic transmission of a vehicle by an electronic transmission control (4), the process comprising the steps of:

  • setting a low road friction drive state for the automatic transmission upon detection of one of slip between driven and non-driven gears of the vehicle and active ABS deceleration (ABS=1);

    determining a value by one of;

    evaluating an active ABS deceleration function (S5 to S7), from one of an actual acceleration of the vehicle and a parameter (e.g., gear speed increase) corresponding to the actual acceleration, and evaluating a slip determination function (S8 to S10), from one of a comparison between a theoretical acceleration and the actual acceleration a(DIFF) and a parameter (e.g., torque reserve) corresponding to the comparison between the theoretical acceleration and the actual acceleration; and

    activating via the electronic transmission control (4) a winter operation mode (S15) when the value (Z) exceeds (Z>

    Z(IN)) a limit value (Z(IN)).

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