Systems and methods for operating a vehicle that includes an engine and an integrated starter/generator are described. In one example, a torque output of an electric machine is increased via a rotation ratio changing device to reduce engine noise and vibration during engine starting. After the engine is started, the rotation ratio changing device is adjusted so that the engine and the electric machine rotate at a same speed.

A transmission arrangement for a hybrid drive of a motor vehicle, in particular a utility vehicle. The transmission arrangement has a change-speed transmission (1), in particular a group transmission (1) with a drive output side (1b), a drive output flange (2) and a countershaft (VW). An add-on transmission (3) is arranged on the change-speed transmission (1) and has at least one electric machine (EM) and at least one gear ratio step (Ü1). The at least one electric machine (EM) is connected to the countershaft (VW) by way of the at least one gear ratio step (Ü1) and can be engaged as an additional electric drive.

A power transmission apparatus for a hybrid electric vehicle may include an input shaft receiving an engine torque, first and second planetary gear sets respectively having first to third rotation elements fourth to sixth rotation elements, a first shaft fixedly connected to the first rotation element and the motor-generator and selectively connectable to the input shaft, a second shaft fixedly connected to the second and sixth rotation elements and selectively connectable to the input shaft, a third shaft fixedly connected to the third rotation element and selectively connectable to the transmission housing, a fourth shaft fixedly connected to the fourth rotation element and selectively connectable to the transmission housing, a fifth shaft fixedly connecting the fifth rotation element and an output gear and selectively connectable to the third shaft, and a plurality of engagement elements including at least one clutch and at least one brake.

A power transmission apparatus for a hybrid electric vehicle may include an input shaft receiving an engine torque, first and second planetary gear sets respectively having first to third rotation elements fourth to sixth rotation elements, a first shaft fixedly connected to the first rotation element and the motor-generator and selectively connectable to the input shaft, a second shaft fixedly connected to the second and sixth rotation elements and selectively connectable to the input shaft, a third shaft fixedly connected to the third rotation element and selectively connectable to the transmission housing, a fourth shaft fixedly connected to the fourth rotation element and selectively connectable to the transmission housing, a fifth shaft fixedly connecting the fifth rotation element and an output gear and selectively connectable to the third shaft, and a plurality of engagement elements including at least one clutch and at least one brake.

A power transmission apparatus of a hybrid electric vehicle includes an input shaft configured of receiving an engine torque, a motor shaft configured of receiving a torque of a motor/generator, first and second planetary gear sets respectively having first to third rotation elements and fourth to sixth rotation elements, a first shaft connected to the first rotation element and selectively connectable to each of the input shaft and the motor shaft, a second shaft fixedly connecting the second and fifth rotation elements, and selectively connectable to the input shaft, the motor shaft, and a transmission housing, respectively, a third shaft fixedly connecting the third and fourth rotation elements and selectively connectable to the transmission housing, a fourth shaft fixedly connecting the sixth rotation element and an output gear, and a plurality of engagement elements including at least one clutch and at least one brake.

A power transmission apparatus for a hybrid electric vehicle may employ two clutches, two brakes, a dog clutch unit to a planetary gear train of having three planetary gear sets, and thereby provide various shifting modes such as an engine mode and a parallel hybrid mode of multiple shift-stages, an electronically-controlled continuously variable shifting mode, and an electric vehicle mode.

An integrated transmission includes a transmission housing having a first housing face through which the input shaft extends; a CVP housed within the housing; and a transmission assembly. The transmission assembly includes an input arrangement contained within the housing and having at least one input transmission component selectively coupling the engine power and the CVP power; a variator arrangement contained within the housing, configured to receive the engine and CVP power and to selectively transfer the engine power, CVP power, and a summing of engine and CVP power as variator output power; and a transmission gear arrangement contained within the transmission housing engaged with the variator arrangement and configured to provide a selective gear reduction for transmission to an output shaft that extends out of the transmission housing. The integrated transmission includes a power electronics apparatus arranged within or on the transmission housing and electrically coupled to the CVP.

A transmission assembly for a hybrid vehicle includes an internal combustion engine and an electric machine, wherein a first drive torque of the internal combustion engine and a second drive torque of the electric machine are transferable to a drive shaft of the hybrid vehicle via the transmission assembly, wherein the transmission assembly comprises: a first transmission input shaft, via which the first drive torque 1 of the internal combustion engine is introduced into the transmission assembly; a second transmission input shaft, via which the second drive torque of the electric machine is introduced into the transmission assembly; the drive shaft; and at least a first planetary transmission including a first ring gear, a first planetary carrier and a first sun gear;
wherein the first transmission input shaft is connected via the first planetary transmission to the second transmission input shaft and to the drive shaft.

The invention relates to a transmission (100) for a hybrid drive arrangement which can be coupled to two drive assemblies (7, 8), comprising an input shaft (10) and an output shaft (11), at least one first and one second shifting element (SE1, SE2), at least one double planetary gear (5). The input shaft (10) can be coupled to the first sun gear of the double planetary gear (5) by means of the first shifting element (SE1), and the input shaft (10) can be coupled to the ring gear of the double planetary gear (5) by means of the second shifting element (SE2) and the output shaft (11) is coupled to the planet carrier of the double planetary gear (5).

The invention relates to a transmission (100) for a hybrid drive arrangement which can be coupled to two drive assemblies (7, 8) for operating the hybrid drive arrangement, comprising an input shaft (10), and an output shaft (11), at least one first and one second shifting element (SE1, SE2), and at least one first and one second planetary gear (5,6). The input shaft (10) can be coupled to the sun gear of the first planetary gear (5) by means of the first shifting element (SE1) and is coupled to the sun gear of the second planetary gear (6). The input shaft (10) can be coupled to planet carrier of the first planetary gear (5) by means of the second shifting element (SE2) which is coupled to the ring gear of the second planetary carrier (6). The output shaft (11) can be coupled to the planet carrier of the second planetary gear (6).