The present invention is a powertrain for a hybrid vehicle, comprising a driving/receiving machine (20), a thermal engine (10) and engine shaft (12), a speed variation device (14) including an engine epicyclic gear train (24) with a sun gear (34) and a crown (42) which are each connected to the engine shaft (12) by an engine controlled coupling (26, 28) and to a fixed part (40) of the powertrain by a one-way automatic coupling (30, 32). A planet gear carrier (46) and a machine epicyclic gear train (60) are arranged on a shaft (62) substantially parallel to engine shaft (12). The planet gear carrier comprises a sun gear (64), a crown (72), a planet gear carrier (68) and an epicyclic gear train controlled coupling (88). The speed variation device (14) comprises a device (94) for connecting/disconnecting electric machine (20) with machine epicyclic gear train (60).

A hybrid driveline assembly that includes a mode clutch, a driving member and a mode clutch shift fork is provided. The mode clutch dog has a first portion that is selectively coupled to a rotation of a first shaft. The first shaft is coupled to receive torque from a first type of motor. The mode clutch dog further has a second portion that is coupled to a rotation of a second shaft. The second shaft is coupled to receive torque from a second different type of motor. The driving member has a first end that is selectively coupled to the mode dog clutch to selectively lock rotation of the driving member with rotation of the mode clutch dog. The driving member further includes at least one gear. The mode clutch shift fork is engaged with the mode clutch dog to selectively manipulate a position of the mode clutch dog.

The invention relates to a multi-speed transmission (10, 110), comprising a power split device (11; 111), an input shaft (12, 112) of the transmission (10, 110) being connected or connectable to prime mover (18, 118), an output shaft (13; 113), two shiftable sub-transmissions (14, 114; 15, 115), each providing a plurality of different gear ratios, and at least one rotating electric machine (16; 116, 116a), connected to said power split device (11; 111), wherein the two sub-transmissions (14, 114; 15, 115) can be connected alternatively to the output shaft (13, 113), and a control system (26; 126, 126a), connecting said electric machine (16; 116, 116a) with an electric battery (27; 127) and auxiliary electrical consumers (31, 131). The electric machine (16; 116, 116a) is connected to the power split device (11; 111) in a way that it allows to reduce torque value down to zero on either an input shaft (20; 120) of the first sub-transmission (14; 114) or on an input shaft (22; 122) of the second sub-transmission (15; 115) by applying different shaft torque levels, and the internal heat generation capacity of the electric machine (16; 116, 116a) exceeds the power capacity of the power line in said control system (26; 126, 126a).

A control apparatus for a vehicle includes an electronic control unit that is configured to set a value of a target generated voltage of the generator. The electronic control unit is configured to execute power generation control to control a generated voltage of a generator. The electronic control unit is configured to maintain a value of the generated voltage in the power generation control to be constant during an upshift gear change when the upshift gear change control of a transmission is executed while the lock-up clutch control is executed during deceleration of the vehicle. The electronic control unit is configured to increase the value in the power generation control during the downshift control to the value of the target generated voltage at a first specified rate when a downshift gear change of the transmission is executed while the lock-up clutch control is executed during the deceleration.

A power transmission apparatus has a power distribution mechanism which is connected to an engine and a first motor-generator an in which at least three rotation elements enable to rotate in differential motions to one another, a power combining mechanism which is connected to the power distribution mechanism, a second motor-generator and an output shaft and in which four rotation elements enable to rotate in differential motions to one another, a brake mechanism which enables to selectively fix a rotation element of the power combining mechanism and a brake mechanism which enables to selectively fix a rotation element of the power combining mechanism which is connected to the engine.

A system and method for controlling a vehicle powertrain including an engine and a motor operable to propel the vehicle includes reducing a torque of the motor at a first torque reduction rate from a torque level above a minimum motor torque in response to a deceleration request. A torque of the engine is reduced at a second torque reduction rate less than the first torque reduction rate in response to the deceleration request.

A drive system includes: a first planetary gear unit, in which a carrier is connected to an internal combustion engine, a sun gear is connected to a first MG, and a ring gear is connected, via a first drive gear and a first driven gear, to a counter shaft; and a second planetary gear unit, in which a brake is provided to a sun gear, a carrier is connected to the internal combustion engine, and a ring gear is connected, via a second drive gear and a second driven gear, to the counter shaft. A gear ratio of the first drive gear and the first driven gear is larger than a gear ratio of the second drive gear and the second driven gear.

A transmission for a motor vehicle has an input shaft, output shaft, first and second minus planetary gear sets, and first electric machine with a rotationally fixed stator and a rotatable rotor connectable to the input shaft. The first planetary gear set is stepped and has planet gears of a larger and a smaller effective diameter. In the first planetary gear set, first sun gear engages the larger planet gears and is connected or connectable to the rotor; second sun gear engages the smaller planet gears and is connected to a sun gear of the second planetary gear set and connectable to the input shaft; a carrier is connected to a ring gear of the second planetary gear set; and a ring gear is rotationally fixable. In the second planetary gear set, the carrier is connectable to the input shaft and the ring gear is connected to the output shaft.

When a brake is turned on during travel of a hybrid vehicle, a required braking force required for a drive shaft is set based on a brake depression amount, a base rotation speed of an engine is set based on the required braking force, a shift stage is set based on the base rotation speed and a vehicle speed, a target rotation speed of the engine is set based on the shift stage and the vehicle speed, and the engine, the first motor, and the second motor are controlled such that the engine operates at the target rotation speed and the required braking force acts on the drive shaft.

A drive device for a hybrid-drive motor vehicle, having an internal combustion engine as a primary drive, an electric engine as a secondary drive, and having planetary gear units that are coupled with one another that can be shifted into different gear steps through shift elements and brakes. The planetary gear units being connectable to a common output shaft by way of input elements and output elements. The reaction elements thereof can be coupled or firmly braked, wherein the drive device can be operated in an electromotor drive, a primary drive having gear steps (gears), or in a hybrid drive.