A powertrain includes an engine; a driveline including a gearbox having an input shaft connected to the engine, an output shaft to be connected to driving wheels of the vehicle and a countershaft for transmitting a rotation of the input shaft to the output shaft which can be coupled to the input shaft; an electric machine; a gear reduction mechanism having a free wheel and at least three separate and rotatable junction elements, the rotational speeds of the junction elements being interdependent but not having a fixed ratio relative to one another:a first junction element that is connected to the electric machine; a second junction element that is connectable to the free wheel; a third junction element that is connected to the countershaft. The torque ratio between the third junction element and the first junction element can be selected from at least two different ratios.

A powertrain includes an engine; a driveline including a gearbox having an input shaft connected to the engine, an output shaft to be connected to driving wheels of the vehicle and a countershaft for transmitting a rotation of the input shaft to the output shaft which can be coupled to the input shaft; an electric machine; a gear reduction mechanism having a free wheel and at least three separate and rotatable junction elements, the rotational speeds of the junction elements being interdependent but not having a fixed ratio relative to one another:a first junction element that is connected to the electric machine; a second junction element that is connectable to the free wheel; a third junction element that is connected to the countershaft. The torque ratio between the third junction element and the first junction element can be selected from at least two different ratios.

A powertrain has an internal combustion engine provided with an accessory transmission that includes a first pulley connected to a crankshaft of the engine, a second pulley connected to a shaft of an electric machine, and a belt connecting the first and the second pulleys to each other to rotate in the same direction of rotation (R). The electric machine is operated to supply an active torque to the second pulley during start-up of the internal combustion engine by means of a starter motor.

A powertrain has an internal combustion engine provided with an accessory transmission that includes a first pulley connected to a crankshaft of the engine, a second pulley connected to a shaft of an electric machine, and a belt connecting the first and the second pulleys to each other to rotate in the same direction of rotation (R). The electric machine is operated to supply an active torque to the second pulley during start-up of the internal combustion engine by means of a starter motor.

An object of this invention is to efficiently warm up a catalyst and keep its temperature. Provided is a drive system, including: an internal combustion engine; a catalytic unit configured to purify an exhaust gas from the internal combustion engine; a motor used for at least one of drive or regeneration; and a flow path formed so as to allow an oil-based medium for lubricating the motor to flow in the vicinity of the catalytic unit. The oil-based medium is heated in the motor and exchanges heat in the catalytic unit to heat the catalytic unit.

It is determined whether fuel efficiency of a vehicle is improved by operating a first rotating machine to generate electricity to such an extent that an electrical path amount becomes a desired electrical path amount for controlling an operating point of an engine to a desired operating point and driving and operating a second rotating machine as a second power source, the electrical path amount being a magnitude of electric power in an electrical path through which the electric power is transferred between the first rotating machine and the second rotating machine. When the electronic control device determines that the fuel efficiency of the vehicle is improved, the first rotating machine is operated to generate electricity to such an extent that the electrical path amount becomes the desired electrical path amount and the second rotating machine is driven and operated as the second power source.

An arrangement of at least one sensor track-scanning rotor position sensor (1, 1 A) of an electric machine (EM) in a hybrid transmission housing (2) that includes a torque converter (3) and a housing-affixed oil supply plate arrangement is provided. The rotor position sensor (1, 1 A) is attached on an oil-supply-plate side, and a sensor ring (8), as a sensor track, is attached on a converter side. A hybrid transmission housing (2) including the arrangement is also provided.

A power transmission device for a hybrid vehicle may include: a cover part mounted on a vehicle body; two motor parts embedded in the cover part; two rotor parts mounted in the respective motor parts and rotated; a transfer part selectively connected to the rotor part; a torsion damper part coupled to the transfer part; a clutch part configured to selectively connect any one of the rotor parts to the transfer part; and an output part connected to the clutch part and configured to discharge power to a transmission, wherein any one of the rotor parts is connected to the torsion damper part.

A mild hybrid vehicle controlling method, wherein the mild hybrid vehicle has a driver assistance module for detecting peripheral vehicle information and a mild hybrid starter & generator (MSHG) may comprises comparing, by a controller, the peripheral vehicle information with a predetermined reference value and deciding whether after-treatment regeneration control is performed or not according to a result of the comparison.

A method for operating a drive train of a motor vehicle, which utilizes at least one permanent-magnet electric machine (EM) as a motor vehicle drive source, is provided. A transmission (G) with different gear ratios is arranged in a power path between the electric machine (EM) and driving wheels (DW) of the motor vehicle. A power converter (LE) is associated with the electric machine (EM) and can operate the electric machine (EM) in a field weakening condition. The method includes prematurely carrying out, delaying, or preventing a changeover of the gear step of the transmission (G) specified by a driving strategy depending on a temperature value of the electric machine (EM) in order to reduce, not increase, or increase with delay a rotational speed of the electric machine (EM). An electronic control unit (ECU) for carrying out the method and a motor vehicle with the control unit (ECU) are also provided.