Patent ID: 6366843
Filing Date: 2002-04-02
Classification: B60W,F16H

Abstract:
A method for controlling an automatic transmission driven by an internal combustion engine in which a shift from a first to a second transmission ratio occurs in the form of a pull upshift by a first clutch opening and a second clutch closing wherein an electronic transmission control device controls, via electromagnetic valves, the pressure curve of the first and of the second clutch during the shifting operation and the shift consists of a rapid-filling (SF), a filling-equalization (FA), a load-transfer (LÃœ), a gradient setting (GE), a sliding (SL), a gradient-reduction (GA) and a closing (S) phase, wherein the gradient-setting (GE), the sliding (GL), the gradient-reduction (GA) and the closing (S) phases the engine intervention is effected by a reduction of the engine torque (M_MOT), an the engine intervention factor (mdzegs) being transmitted from a transmission control device to an engine control device of the internal combustion engine, and wherein a clutch pressure (P_K) on the closing clutch is calculated from a static engine torque with engine intervention (M_STAT ME), a dynamic engine torque (M_DYN), a factor (F1), a converter reinforcement (WV) and an absolute pressure (P_ABS), the static engine torque with engine intervention (M_STAT ME) being calculated as the product from the static engine torque (M_STAT) by the sum of one minus the engine intervention factor (mdzegs).