Patent ID: 6263273
Filing Date: 2001-07-17
Classification: F16H,Y10S,Y10T

Abstract:
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, andevaluating 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; andactivating via the electronic transmission control (4) a winter operation mode (S15) when the value (Z) exceeds (Z>Z(IN)) a limit value (Z(IN)).