A vehicle includes an engine, electric machine, starter-generator, and a controller. The engine and electric machine are each configured to propel the vehicle. The starter-generator is coupled to the engine and is configured to adjust engine speed during an engine start-up event. The controller is programmed to, in response to engine speed increasing towards a target speed during an engine start-up event, generate a target drag torque with the starter-generator to reduce overshoot of the target engine speed.

A hybrid transmission system with a multi-speed gearbox. The multi-speed gearbox, in one example, includes a first primary shaft with a first set of gears positioned thereon and selectively coupled to an internal combustion engine (ICE) at a first end and a second primary shaft with a second set of gears positioned thereon. The gearbox further includes a secondary shaft with a third set of gears that mesh with the first set of gear and the second set of gears and an electric drive interface gear that is idly mounted, free to spin, on the second primary shaft, positioned between two gears in the second set of gears, and configured to receive mechanical power from an electric machine and an output shaft that is configured to mechanically attached to a differential.

A hybrid transmission system with a multi-speed gearbox. The multi-speed gearbox is configured to rotationally couple a prime mover and an electric machine to different gear ratios during a hybrid drive mode. The multi-speed gearbox includes an electric drive interface gear positioned coaxial to a first primary shaft and a second primary shaft and idly mounted, free to spin, to the second primary shaft and an output shaft that includes an output shaft gear which is fixedly coupled thereto meshes with a gear on a secondary shaft.

A system and method for controlling backlash in a vehicle powertrain includes the step of controlling a torque request of the powertrain with a first control strategy after an occurrence of a backlash predictor and before an occurrence of a backlash. Another step may be employed whereby the torque request is controlled with a second control strategy after the first control strategy and before the occurrence of the backlash such that a torque request level is below a highest torque request level obtained during the first control-strategy.

A transmission system that includes a multi-speed gearbox. The multi-speed gearbox, in one example, includes a primary shaft with a first set of gears positioned thereon, a secondary shaft with a second set of gears positioned thereon, an internal combustion engine (ICE) clutch configured to selectively couple an ICE to the primary shaft, and an electric drive interface gear that is positioned axially between two gears in the first set of gears, configured to couple to an electric machine, and coupled to a gear in the second set of gears.

A transmission system is that includes a multi-speed gearbox. The multi-speed gearbox, in one example, includes a dual-clutch assembly configured to selectively engage a primary shaft and/or a second primary shaft and an electric drive clutch configured to selectively engage an electric drive interface gear, wherein the electric drive interface gear is positioned axially between two gears on the first or second primary shafts. The transmission system further includes a controller including instructions that when executed, during a first operating condition, cause the controller to operate the dual-clutch assembly to transfer mechanical power between an internal combustion engine (ICE) and the first primary shaft or the second primary shaft or operate the electric drive clutch to transfer mechanical power between an electric machine and the first primary shaft, the second primary shaft, or a secondary shaft.

The present disclosure provides a shifting control method for hybrid vehicles to reduce the occurrence of a clutch releasing phenomenon due to an excessive change in input torque of a transmission during shifting of the vehicle, including: an entering step of performing, by a controller, a control to enter a torque hand over control in response to power off down shifting; and a rising control step of controlling, by the controller, an engagement side clutch torque to rise to correspond to a changed input torque of a transmission when a change rate in input torque of the transmission is equal to or more than a reference value during the torque hand over process.

A constructional unit for a hybrid powertrain of a motor vehicle includes: an electric machine with a stator and a rotor, wherein the rotor is configured to transmit a torque to the powertrain; a clutch arrangement with at least one clutch actuation unit, wherein the clutch arrangement is configured to decouple an internal combustion engine from the powertrain, the internal combustion engine being provided parallel to the electric machine for transmitting a torque; and a vibration absorber apparatus configured to reduce vibrations in the powertrain. The clutch actuation unit is arranged axially substantially radially within the vibration absorber apparatus.

A driving control method of a hybrid vehicle is provided. The method includes when a specific zone related to discharge of exhaust gas is detected ahead on a path, determining whether a current state of charge (SoC) of a battery is greater than a first value. When the current SoC is greater than the first value, driving in a first mode for charging the battery in power of an engine in a first section disposed before entrance into the specific zone. Upon entering a second section corresponding to the specific zone, a current mode into a second mode for driving using power of a motor only is converted, battery consumption is reduced using at least one step along with a change in the current SoC in the second section.

The present invention provides a shift control method implemented in a vehicle equipped with an automatic transmission for controlling an input shaft rotation speed to a target input shaft rotation speed during a shift. The method includes setting of a basic target synchronization rotation speed that is a basic target value of the input shaft rotation speed during the shift, and setting of a corrected target input shaft rotation speed as the target input shaft rotation speed when the shift is a downshift without a requirement for a driving force of the vehicle, The corrected target input shaft rotation speed is obtained by decreasingly correcting the basic target synchronization rotation speed. Further, a decreasing correction amount of the basic target synchronization rotation speed is set so as to become larger as a deceleration of the vehicle becomes larger.