Process for preventing oscillating gearshifting in automatic motor vehicle transmissions by suitable reduction of engine torque

Abstract

A method for preventing oscillating gearshifts of a motor vehicle automatic transmission with electronic transmission control device is proposed with the following characteristics. The transmission control device monitors the current road resistance from a comparison of measured vehicle acceleration with a theoretical vehicle acceleration and determines therefrom the value of differential acceleration. The engine torque is reduced if: (a) the position of the accelerator pedal of the motor vehicle is greater than a first limit value; (b) the differential acceleration is greater than a second limit value; (c) the measured vehicle acceleration is greater than a positive third limit value; (d) the theoretical impingement in the next higher gear is lower than a fourth limit value; and (e) the current engine speed is greater than a fifth limit value.

Dependencies are inferred from the claim text.