Methods and systems are provided for operating a driveline of a hybrid vehicle powertrain, where the driveline includes an electric machine downstream of a dual clutch transmission, which is downstream of an engine. In one example, a method comprises communicating from a transmission, a torque to accelerate transmission components from a first speed to a second speed with first and second clutches of a dual transmission open, the communicating performed while an electric machine coupled to the dual clutch transmission at a location downstream of the dual clutch transmission is providing torque to propel a vehicle. In this way, wheel speed may remain substantially constant while the transmission is shifted and the engine is stopped.

Methods and systems are provided for operating a driveline of a hybrid vehicle that includes an internal combustion engine, an electric machine, and a transmission are described. In one example, the engine is started and coupled to the driveline via closing a clutch of a dual clutch transmission. Speed of the engine and clutch pressure are controlled to reduce driveline torque disturbances and provide a desired wheel torque.

A drive train for a hybrid motor vehicle having a gearbox input shaft operatively connected to a first electric machine and an internal combustion engine via a first partial drive train to transmit torque and which is operatively connected to a second electric machine via a second partial drive train to transmit torque. The second electric machine is permanently connected to the gearbox input shaft for torque transmission and the first electric machine and the internal combustion engine can be connected to the gearbox input shaft in a coupleable manner to transmit torque. The first electric machine and the second electric machine are arranged coaxially to one another, and driven shaft of the first electric machine is arranged radially inside a driven shaft of the second electric machine. The driven shaft of the first electric machine is mounted on the driven shaft of the second electric machine via a bearing.

In an aspect, an automotive air conditioning assembly comprising a scroll compressor and a wrap spring clutch. The wrap spring clutch enables the use of a comparatively smaller pulley (a diameter of at most 85 mm) which comparatively increases the compressor speed and hence cooling capacity at a given engine speed. The clutch requires low power (e.g. less than 5 Watts) for continuous operation.

A control apparatus for a vehicle includes an input-rotation limiting portion configured, when the vehicle starts running and is accelerated, to calculate an estimated speed value that is a speed value of an input rotational speed of an automatic transmission upon elapse of a predetermined length of time, and to calculate an estimated force value that is a force value of a piston pressing force acting on a piston in a forward direction in a released engagement device upon the elapse of the predetermined length of time, based on a centrifugal hydraulic pressure in a pressure chamber of the released engagement device and the centrifugal hydraulic pressure in a canceller chamber of the released engagement device. When the estimated force value is not smaller than a predetermined threshold, the input-rotation limiting portion restrains an increase of the input rotational speed.

A drive unit for a drivetrain of a hybrid motor vehicle comprises a first electric machine and a second electric machine, which, in respect of its rotor, is arranged coaxially with an axis of rotation of a rotor of the first electric machine. A first transmission stage is arranged between a drive component, which is configured to be selectively coupled for conjoint rotation to an output shaft of an internal combustion engine, and a power shaft of the first electric machine and/or of the second electric machine. A transmission component unit is provided, via which the power shaft of the respective electric machine is configured to be selectively coupled to wheel driveshafts. The drive component of the internal combustion engine is coupled to an intermediate gear unit via a second transmission stage. The intermediate gear unit has an integrated clutch and is further connected to the wheel driveshafts in such a way that, depending on the position of the integrated clutch, the internal combustion engine is coupled to the wheel driveshafts via at least the second transmission stage or is decoupled from the wheel driveshafts.

A clutch device includes a clutch input hub which is connectable to a drive unit (24), a clutch output hub which is connectable to an electric machine and/or to a transmission, a clutch via which the clutch input hub can be selectively brought into rotary driving connection with the clutch output hub, and an actuating piston for hydraulically actuating the clutch, a chamber to which fluid may be applied being assigned to said actuating piston, wherein fluid can be applied to the chamber via a first rotary feedthrough between a stationary component and the clutch input hub and via a second rotary feedthrough between the clutch input hub and the clutch output hub. The first rotary feedthrough and the second rotary feedthrough are designed on the side of clutch input hub facing outward in radial direction. A drivetrain having the clutch device is also included.

A vehicle includes a step-ratio automatic transmission having clutches engageable to provide forward and reverse gears, an electric machine selectively coupled to the transmission, a main pump powered by the electric machine and supplying oil to actuate selected transmission clutches, a gear selector configured for selecting a transmission gear, and a controller configured to stop the electric machine when the gear selector selects park or neutral, to operate the electric machine in a speed control mode using a higher controller gain in response to the gear selector selecting forward or reverse while the electric machine is stopped until the electric machine and the main pump reach a first speed threshold to reduce engagement delay of at least one of the transmission clutches, and to operate the electric machine using a lower controller gain when the electric machine and the main pump exceed the first speed threshold.

Methods and systems are provided for entering into a parked state in a hybrid electric vehicle that includes a dual clutch transmission. In one example, a driveline operating method comprises in response to a first condition, engaging a first gear and engaging a second gear of a dual clutch transmission in response to a request to enter a vehicle park state where an output of a transmission is held from rotating, and in response to a second condition, engaging a third gear and engaging a fourth gear of a dual clutch transmission in response to a request to enter a vehicle park state. In this way, a park state may be entered into without the use of a park pawl, which may reduce costs associated with the vehicle and which may prevent issues associated with degradation of the park pawl.

The decelerating device according to the disclosure includes first and second planetary gear mechanisms arranged in an inner space of a hollow type electric motor having an annular rotor. The first planetary gear mechanism includes a first ring gear integral with the rotor, a non-rotatable first carrier for supporting a first pinion gear engaged with the first ring gear to be rotatable, and a first sun gear engaged with the first pinion gear. The second planetary gear mechanism includes a second ring gear integral with the rotor, a second carrier supporting a second pinion gear engaged with the second ring gear to be rotatable and connected to the output shaft, and a second sun gear engaged with the second pinion gear and connected to the first sun gear.