Abstract: A vehicle powertrain has a first electrical machine with first power electronics, a second electrical machine with second power electronics, and a transmission connected between the electrical machines and an output. In symmetrical operation, the first and the second electrical machine are operated with an equal torque and torque gradient. When executing a shift non-symmetrical operation, the first and the second electrical machines are operated with different torque and/or torque gradient. During a symmetrical operation if it is detected that a shift with a non-symmetrical operation is to be executed, the symmetrical operation is exited prior to executing the shift to provide a mode in which the electrical machine operated with higher torque and/or torque gradient, is operated with limited torque and/or torque gradient to reduce a temperature of the electrical machine and the associated power electronics operated with a higher torque and/or torque gradient.

Abstract: A vehicle powertrain has a first electrical machine with first power electronics and a second electrical machine with second power electronics. In symmetrical operation, the first and second electrical machines are loaded or operated with the same torque and with the same torque gradient. In a non-symmetrical operation, the first and second electrical machines are loaded or operated with a different torque and/or with a different torque gradient. If, after non-symmetrical operation the symmetrical operation is resumed, a subsequent modified operation can be used in which the electrical machine that was loaded or operated in non-symmetrical operation with higher torque and/or a higher torque gradient, is loaded or operated with a limited torque and/or with a limited torque gradient or is switched off or decoupled for a defined period of time, thereby at least partially compensating for a different aging of the electrical machines due to non-symmetrical operation.

Abstract: A vehicle powertrain features a first electrical machine with first power electronics, a second electrical machine with second power electronics, and a transmission connected between the electrical machines and an output. To execute a powershift, the first and second electrical machines are operated so that one of the electrical machines is used as the main drive machine, and the other electrical machine is used for tractive force support during the execution of the powershift. When a temperature of at least one of the electrical machines and/or of at least one of the power electronics exceeds a temperature limit value, and/or when a target electric current flowing through at least one of the electrical machines and/or at least one of the power electronics exceeds a current limit value, a powershift is adapted to limit heating of the respective electrical machine and/or the respective power electronics.

Abstract: Disclosed is an electric vehicle transmission (6?) comprising a drive input shaft (11), a drive output shaft (13), a first planetary gearset (15), and a second planetary gearset (16). The drive input shaft (11) is provided for connection to an electric machine (7), where each of the first planetary gearset (15) and the second planetary gearset (16) includes a first element (17, 18), a second element (19, 20) and a third element (21, 22), respectively. A first shifting element (A) and a second shifting element (B?) are provided, by the selective actuation of which the drive input shaft (11) can be connected to the drive output shaft (13) by means of the planetary gearsets (15, 16) by engaging a gear. Also disclosed is a drive module (2?) with such an electric vehicle transmission (6?) and a method for operating an electric vehicle transmission (6?).

Abstract: Disclosed is an electric vehicle transmission (6?) comprising a drive input shaft (11), a drive output shaft (13), a first planetary gearset (15), and a second planetary gearset (16). The drive input shaft (11) is provided for connection to an electric machine (7), where each of the first planetary gearset (15) and the second planetary gearset (16) includes a first element (17, 18), a second element (19, 20) and a third element (21, 22), respectively. A first shifting element (A) and a second shifting element (B?) are provided, by the selective actuation of which the drive input shaft (11) can be connected to the drive output shaft (13) by means of the planetary gearsets (15, 16) by engaging a gear. Also disclosed is a drive module (2?) with such an electric vehicle transmission (6?) and a method for operating an electric vehicle transmission (6?).

Abstract: A transmission having a main transmission and a splitter group, and including at least four spur gear planes formed with a countershaft and at least five shifting elements for engaging at least six gears between the transmission input and output shafts. When shifting between gears with the highest and the second-highest gear ratios, a shift occurs in the shifting elements associated with the splitter group but not in the shifting elements associated with the main transmission, whereas when shifting between gears with the lowest and second-lowest gear ratios, a shift occurs in the shifting elements associated with the main transmission but not in the shifting elements associated with the splitter group. An electric machine can be connected by a gearset, and depending on its shift position, the gearset acts as a pre-transmission ratio for the electric machine or as a superimposition transmission.

Abstract: A drive-train for a vehicle having at least one electric drive unit (EM) which is, or can be, coupled by way of a driveshaft (AW) to at least a first transmission stage (i1), a second transmission stage (i2) and a third transmission stage (i3). At least one shifting device having at least two interlocking shifting elements (S1, S2) is provided for engaging the first and second transmission stages (i1, i2), and a frictional shifting element (S3) is provided for traction a force support of the first and the second transmission stages. The frictional shifting element (S3) is also provided for engaging the third transmission stage (i3).

Abstract: A transmission for a hybrid drive having transmission input and output shafts, a further transmission input shaft and an electric machine, which drives the further transmission input shaft. A main transmission has first and second partial transmissions with a plurality of gear planes and a pair of concentric fourth shafts, and shift elements. A range group can couple the main transmission and has a planetary gearset with three transmission elements. The first element can couple either of the transmission input shafts via the shift elements. The second element is connected to the transmission output shaft and can couple a gear plane of the partial transmissions via the shift elements. The third transmission element can be fixed to the housing or blocked against the first or second transmission element.

Abstract: A method of operating a vehicle having a hybrid drive, a transmission with shift elements, a drive output with a brake, a main transmission with input shafts, an output shaft and planetary gear sets (PG1, PG2). The main transmission has five gear planes. One shift element can connect a gear plane to an element of gear set (PG1) adjoining the main transmission. Another shift element couples a further element of gear set (PG1) either to the output shaft or a housing. An electric machine is permanently connected to an element of gear set (PG2). If, while driving with a transmission gear engaged, the drive output brake is engaged for a full brake application, a shift element of the transmission is first relieved by the electric machine and/or a brake assigned to one of the input shafts and then subsequently disengaged to decouple the combustion engine from the drive output.

Abstract: A dual clutch transmission including two sub-transmissions, each having an input shaft arranged on an input axis, an intermediate shaft and an output shaft which is the drive output of both sub-transmissions. The intermediate shaft can be connected to the input and output shafts. The transmission also has wheel planes, shifting elements, two clutches and countershafts. A first countershaft can be connected to transmission elements of all the wheel planes on the countershaft axis and a second countershaft is connected to transmission elements of at least two wheel planes. The shifting elements include at least one single shifting element, but most of the shifting elements are double shifting elements. Two shifting elements are arranged on the input axis between two wheel planes, whose transmission elements are connected to the second countershaft. Opposite sides of the intermediate shaft are respectively connected to a range group and the output shaft.

Abstract: A method for compensation of a support torque at a combustion engine and transmission which provide an overlay of combustion engine and electric machine. The combustion engine, the electric machine, and a transmission gearset are connected with each other via a planetary gearset, which is positioned in front of a downstream transmission gearset. The invention concerns a transmission gearset of a three-shaft transmission, each with a transmission input shaft for the electric machine, and for the combustion engine, and an output shaft. For the connection or disconnection of the transmission input shaft of the electric machine while driving, the electric machine is used for the synchronization of the input shaft of the electric machine, and the created support torque at the combustion engine is determined, based on this support torque, to match a combustion engine torque and thus to compensate the support torque.

Abstract: A drive-train for a vehicle having at least one electric drive unit (EM) which is, or can be, coupled by way of a driveshaft (AW) to at least a first transmission stage (i1), a second transmission stage (i2) and a third transmission stage (i3). At least one shifting device having at least two interlocking shifting elements (S1, S2) is provided for engaging the first and second transmission stages (i1, i2), and a frictional shifting element (S3) is provided for traction a force support of the first and the second transmission stages. The frictional shifting element (S3) is also provided for engaging the third transmission stage (i3).

Abstract: A transmission for a hybrid drive having transmission input and output shafts, a further transmission input shaft and an electric machine, which drives the further transmission input shaft. A main transmission has first and second partial transmissions with a plurality of gear planes and a pair of concentric fourth shafts, and shift elements. A range group can couple the main transmission and has a planetary gearset with three transmission elements. The first element can couple either of the transmission input shafts via the shift elements. The second element is connected to the transmission output shaft and can couple a gear plane of the partial transmissions via the shift elements. The third transmission element can be fixed to the housing or blocked against the first or second transmission element.

Abstract: A method for operating a drive-train having two drives, a drive output, a manual transmission having a planetary gearset and two independent load paths. From the first and second drives, torque can pass to the output via respective first and second paths. The two drives can be coupled to respective elements of the planetary gearset, and the transmission is coupled to a web gear. To start, when torque passes to the output first via a second path gear and thereafter via a first path gear whose ratio is different from that of the second path gear, then before changing from the second path to the first path, the torque passed at the web gear is changed such that if torque desired by the driver is unchanged, despite the change from the second to the first path, the torque acting at the output remains constant.

Abstract: A hybrid vehicle transmission (1) having internal combustion engine (8) and electric machine (5). The transmission (1) comprises main transmission (HG) with two parallel partial transmissions; output shaft (4); first (R1), second (R2), third (R3), fourth (R4) and output constant (R5) gear planes each comprising a fixed gear on countershaft (VW) and respective meshing loose gear; first (A), second (B), third (C), fourth (D), fifth (E), sixth (F), seventh (G) and eighth (H) shift elements. Whenever eighth shift element (H) is engaged, the loose gear of fifth gear plane (R5) is engaged with the output shaft (4) of the main transmission (HG), whenever the seventh shift element (G) is engaged, loose gear of fourth gear plane (R4) is engaged with the output shaft (4), and whenever the sixth shift element (F) is engaged, loose gear of fourth gear plane (R4) is engaged with the first transmission input shaft (2).

Abstract: A transmission having a main transmission and a splitter group, and including at least four spur gear planes formed with a countershaft and at least five shifting elements for engaging at least six gears between the transmission input and output shafts. When shifting between gears with the highest and the second-highest gear ratios, a shift occurs in the shifting elements associated with the splitter group but not in the shifting elements associated with the main transmission, whereas when shifting between gears with the lowest and second-lowest gear ratios, a shift occurs in the shifting elements associated with the main transmission but not in the shifting elements associated with the splitter group. An electric machine can be connected by a gearset, and depending on its shift position, the gearset acts as a pre-transmission ratio for the electric machine or as a superimposition transmission.

Abstract: A method of operating a vehicle having a hybrid drive, a transmission with shift elements, a drive output with a brake, a main transmission with input shafts, an output shaft and planetary gear sets (PG1, PG2). The main transmission has five gear planes. One shift element can connect a gear plane to an element of gear set (PG1) adjoining the main transmission. Another shift element couples a further element of gear set (PG1) either to the output shaft or a housing. An electric machine is permanently connected to an element of gear set (PG2). If, while driving with a transmission gear engaged, the drive output brake is engaged for a full brake application, a shift element of the transmission is first relieved by the electric machine and/or a brake assigned to one of the input shafts and then subsequently disengaged to decouple the combustion engine from the drive output.

Abstract: A method for compensation of a support torque at a combustion engine and transmission which provide an overlay of combustion engine and electric machine. The combustion engine, the electric machine, and a transmission gearset are connected with each other via a planetary gearset, which is positioned in front of a downstream transmission gearset. The invention concerns a transmission gearset of a three-shaft transmission, each with a transmission input shaft for the electric machine, and for the combustion engine, and an output shaft. For the connection or disconnection of the transmission input shaft of the electric machine while driving, the electric machine is used for the synchronization of the input shaft of the electric machine, and the created support torque at the combustion engine is determined, based on this support torque, to match a combustion engine torque and thus to compensate the support torque.

Abstract: A transmission having two clutches which engage to drive respective input shafts coaxially arranged along an input axis on an input side of the transmission. An output shaft outputs drive from both input shafts. The transmission has a plurality of wheel planes and shifting elements. A first countershaft extends along a countershaft axis over all the wheel planes and a coaxial, hollow second countershaft has transmission elements of two wheel planes. A shifting element couples the countershafts. At least six forward gears can be engaged including overdrive and direct gears. An additional gear, having a gear ratio greater than one, can be obtained by actuating only one shifting element. The direct gear can be obtained by actuating one shifting element and the overdrive gear can be engaged by actuating two shifting elements axially arranged on a side of the shifting element that actuates the additional gear facing the input side.

Abstract: A hybrid vehicle transmission (1) having internal combustion engine (8) and electric machine (5). The transmission (1) comprises main transmission (HG) with two parallel partial transmissions; output shaft (4); first (R1), second (R2), third (R3), fourth (R4) and output constant (R5) gear planes each comprising a fixed gear on countershaft (VW) and respective meshing loose gear; first (A), second (B), third (C), fourth (D), fifth (E), sixth (F), seventh (G) and eighth (H) shift elements. Whenever eighth shift element (H) is engaged, the loose gear of fifth gear plane (R5) is engaged with the output shaft (4) of the main transmission (HG), whenever the seventh shift element (G) is engaged, loose gear of fourth gear plane (R4) is engaged with the output shaft (4), and whenever the sixth shift element (F) is engaged, loose gear of fourth gear plane (R4) is engaged with the first transmission input shaft (2).