Bayerische Motoren Werke Aktiengesellschaft

Helmut Krenn

Lothar Wolf

Hubert Schumacher

A method for regulating and/or controlling an engine-transmission unit in a motor vehicle includes prioritizing torque demands to obtain an only torque value, storing the only torque value as a current successful situation and retaining the torque value for the previous successful situation, and processing the torque value of the current successful situation as well as the torque value of the previous successful situation to comparable torque values in each case required for the implementation of the demands. The method farther includes changing a desired torque demand at driving wheels of the motor vehicle from the torque value of the previous successful situation to the torque value of the current successful situation in the event of a priority change when the current successful situation is different from the previous successful situation, sending the desired torque demand to an electronic controller, and carrying out the desired torque demand by controlling at least one of engine parameters and a ratio of a transmission unit.

Method and system for the regulation and/or control of an engine gearbox unit in a motor vehicle

The invention concerns a process and a device for engine and transmission control in a motor vehicle with an internal combustion engine controlled by an engine control and a stepped automatic transmission controlled by a transmission control. A desired transmission output torque is realized in that except during gear shifting of the stepped automatic transmission at least the gear ratio is detected, an engine torque default (M_IND_ACC) affecting the filling and/or an engine torque default (M_IND_GS) affecting the ignition are calculated from at least the gear ratio and the transmission output torque, and these dimensions are relayed to the engine control, which controls the filling and the ignition of the internal combustion engine taking into account at least these dimensions, and during gear shifting a synchronization engine torque default (M_IND_SYNC) is calculated which provides the engine torque required at the moment after gear shifting, the engine torque default (M_IND_ACC) affecting the filling during gear shifting is calculated from at least the synchronization engine torque default, the engine torque default (M_IND_GS, M_IND_GSZF) affecting the ignition is determined in such a way that a default speed trace dependent on the gear ratio change upon the gear shifting of the transmission is adjusted,the engine torque (M_IND) realizable by the engine is determined.

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Unterfoehring, Germany

Helmut Krenn