Method and device for operating a drive device, drive device

Abstract

A drive device and methods for operating a drive device of a motor vehicle, having an internal combustion engine, an electric machine, and a dual-clutch transmission. The dual-clutch transmission has two clutches, by means of which the transmission can be connected to the internal combustion engine. At least the internal combustion engine is actuated in a driving operation in order to generate a target drive torque, and the clutches are actuated in opposite directions for a gear shift. During a gear shift, the electric machine, which is connected to the dual-clutch transmission without a clutch, is actuated such that the electric machine completely or partly generates the target torque at least temporarily.

What is claimed is: 
     
         1 . A device for operating a drive device of a motor vehicle, the drive device including an internal combustion engine, an electric machine, and a dual-clutch transmission, wherein the dual-clutch transmission includes two clutches and is operatively coupled to the internal combustion engine by the two clutches, the device for operating the drive device comprising a control unit configured to
 actuate, in a driving mode, the internal combustion engine of the motor vehicle to generate a target drive torque; and   activate the two clutches in opposite directions during a gear shifting process, wherein during the gear shifting process the electric machine of the motor vehicle is actuated in such a way that the electric machine at least partly generates the target drive torque.   
     
     
         2 . The device of  claim 1 , wherein the controller is further configured to actuate the electric machine in such a way that said electric machine completely or partially takes over that portion of the target drive torque which is provided by the internal combustion engine. 
     
     
         3 . The device of  claim 1 , wherein the controller is further configured to initiate the gear shifting process by reducing a torque which is transmitted by the internal combustion engine to the dual-clutch transmission. 
     
     
         4 . The device of  claim 3 , wherein the controller is configured to reduce the torque which is transmitted by the internal combustion engine to the dual-clutch transmission by opening the clutch which currently connects the internal combustion engine to the dual-clutch transmission. 
     
     
         5 . The device of  claim 3 , wherein the controller is configured to reduce the torque which is transmitted by the internal combustion engine to the dual-clutch transmission by reducing an engine torque which is predefined by the internal combustion engine. 
     
     
         6 . The device of  claim 1 , wherein the controller is further configured to open a clutch of the two clutches which connects the internal combustion engine to the dual-clutch transmission only after the engine torque of the internal combustion engine is reduced to zero. 
     
     
         7 . The device of  claim 1 , wherein the controller is further configured to completely open both of the two clutches during a rotational speed synchronization of the dual-clutch transmission during the gear shifting process. 
     
     
         8 . The device of  claim 1 , wherein the controller is further configured to initiate the gear shifting process by opening one clutch of the two clutches which connects the internal combustion engine to the dual-clutch transmission and at the same time at least partially closing another clutch of the two clutches. 
     
     
         9 . A drive device for a motor vehicle comprising:
 an internal combustion engine;   an electric machine;   a dual-clutch transmission, the dual-clutch transmission includes two clutches by which the dual-clutch transmission can be operatively connected to the internal combustion engine, wherein the electric machine is operatively connected to the dual-clutch transmission without a clutch; and   a controller configured to
 actuate, in a driving mode, the internal combustion engine of the motor vehicle to generate a target drive torque; and 
 activate the two clutches in opposite directions during a gear shifting process, wherein during the gear shifting process the electric machine of the motor vehicle is actuated in such a way that the electric machine at least partly generates the target drive torque. 
   
     
     
         10 . The drive device of  claim 9 , wherein the controller is further configured to actuate the electric machine in such a way that said electric machine completely or partially takes over that portion of the target drive torque which is provided by the internal combustion engine. 
     
     
         11 . The drive device of  claim 9 , wherein the controller is further configured to initiate the gear shifting process by reducing a torque which is transmitted by the internal combustion engine to the dual-clutch transmission. 
     
     
         12 . The drive device of  claim 11 , wherein the controller is configured to reduce the torque which is transmitted by the internal combustion engine to the dual-clutch transmission by opening the clutch which currently connects the internal combustion engine to the dual-clutch transmission. 
     
     
         13 . The drive device of  claim 11 , wherein the controller is configured to reduce the torque which is transmitted by the internal combustion engine to the dual-clutch transmission by reducing an engine torque which is predefined by the internal combustion engine. 
     
     
         14 . The drive device of  claim 9 , wherein the controller is further configured to open a clutch of the two clutches which connects the internal combustion engine to the dual-clutch transmission only after the engine torque of the internal combustion engine is reduced to zero. 
     
     
         15 . The drive device of  claim 9 , wherein the controller is further configured to completely open both of the two clutches during a rotational speed synchronization of the dual-clutch transmission during the gear shifting process. 
     
     
         16 . The drive device of  claim 9 , wherein the controller is further configured to initiate the gear shifting process by opening one clutch of the two clutches which connects the internal combustion engine to the dual-clutch transmission and at the same time at least partially closing another clutch of the two clutches.