The invention relates to a method for controlling a drivetrain having an internal combustion engine, a dual-clutch transmission, having a first and second sub-transmission having at least one shiftable gear ratio, a first friction clutch disposed between the internal combustion engine and the first sub-transmission and a second friction clutch disposed between the internal combustion engine and the second sub-transmission to provide a drivetrain torque at a transmission output of the dual-clutch transmission by transferring an engine torque adjusted thereto via the friction clutches. So as to be able to continue operating a friction clutch which may have a previously damaged friction lining, at a first clutch torque transferred via the first friction lining, depending on a friction coefficient and a current temperature of a second friction lining of the second friction clutch, the second friction clutch is engaged at a gear ratio selected in the second sub-transmission and the friction lining is heated to a specified temperature.

A shifting control method for a vehicle including: a shifting requirement determination step in which a controller determines whether power-on downshifting is required and whether a gear level when shifting is started is equal to or greater than a fourth gear; a first torque crossing step in which, when power-on downshifting is required from the gear level equal to or greater than the fourth gear, torque of a first clutch is decreased and torque of a second clutch is increased; a gear manipulation step in which, when the first clutch is released by the first torque crossing step, a target gear is engaged by manipulating a synchronizer while the torque of the second clutch is maintained; and a second torque crossing step in which, when the target gear has been engaged by the gear manipulation step, the first clutch is engaged and the second clutch is released.

In a method of operating a drive device for a motor vehicle, a clutch is at least partly engaged, while an internal combustion engine of the drive device is inactive during coasting of the motor vehicle and the clutch is disengaged, to crank and thereby start the internal combustion engine with a clutch torque applied to the clutch. The clutch torque is hereby determined from a default wheel slip value which is based on a motor vehicle parameter.

Methods and systems for tuning vehicle drivability are provided. The vehicle system includes, in one example, a vehicle control unit (VCU) that is designed to electronically communicate with a human machine interface (HMI). In the system, the VCU is designed to, in reaction to receiving an acceleration or deceleration request from the HMI, send a virtual acceleration or deceleration command to a transmission control unit (TCU), where the virtual acceleration or deceleration command correlates to the acceleration or deceleration request and the correlation is user adjustable via a user interface (UI) of the VCU.

A vehicle control device calculates a target line pressure based on an instructed torque capacity of a friction engaging element and a belt capacity when the friction engaging element is determined as not engaging. Belt capacity is calculated using an input torque of a continuously variable transmission mechanism. The device calculates torque down in a driving source based on an upper limit line pressure when the calculated target line pressure exceeds such line pressure. A limit torque capacity of the friction engaging element is calculated using the input torque and a belt capacity when the friction engaging element is determined as not engaging. The belt capacity is calculated using an actual line pressure. The device restrains a slip between pulleys and a power transmitting member using the target line pressure, the torque down, and the limit torque capacity when the friction engaging element is determined as not engaging.

The present disclosure provides a driving control method for hybrid type vehicles with a DCT. The method includes: receiving the motor speed from a driving motor; when abnormality of the motor speed is detected, requesting driving of an engine and determining whether an engine clutch is engaged; if it is determined that the engine clutch is released, controlling a clutch of a current driving stage using a clutch torque higher than a transmission input torque; controlling the current driving stage to be a limp home driving stage set in advance to be in a limp home driven status.

Disclosed is a startup control method for a hybrid vehicle, the method including judging, by a controller, whether starting motion of the vehicle is possible using only a motor or whether starting motion of the vehicle additionally requires power of an engine, preparing the power of the engine, by the controller, by igniting the engine and also initiating engagement of a driving gear when it is judged that starting motion of the vehicle additionally requires the power of the engine, and linearly increasing a torque of the motor to a maximum value, and completing the remainder of a motion start process by increasing a torque of a clutch while increasing a torque of the engine, by the controller, when transmission of the power of the engine to a drive wheel becomes possible via the preparation of the power of the engine.

A method for rocking a motor vehicle free. The vehicle has a drive-train with an automatic drive torque adjusting element, which transmits torque to a wheel, and a rotational speed and direction sensor system for detecting movement of the vehicle such that when the accelerator pedal is biased to a position different from its non-actuated position a desired drive torque can be produced. The torque adjusting element can be controlled based on the accelerator pedal position in relation to the drive torque that can be produced by the driver, and, in a rocking-free process, alternating deflection and release of the accelerator pedal causes the drive torque to fluctuate. With the rotational speed and direction sensor system, the drive torque adjusting element is controlled to suppress drive torque transmission if the travel direction of a current unpowered vehicle movement is not the same as a forthcoming power-driven vehicle movement.

In a method of operating a drive device for a motor vehicle, a clutch is at least partly engaged, while an internal combustion engine of the drive device is inactive during coasting of the motor vehicle and the clutch is disengaged, to crank and thereby start the internal combustion engine with a clutch torque applied to the clutch. The clutch torque is hereby determined from a default wheel slip value which is based on a motor vehicle parameter.

A control system for a hybrid vehicle configured to promptly shift a drive mode. In the single-motor mode, the vehicle is powered by a second motor while bringing an engagement device into disengagement and stopping the engine. In the dual-motor mode, the vehicle is powered by both a first motor and the second motor while bringing the engagement device into engagement and stopping a rotation of the output shaft of the engine by a stopper device. When shifting the drive mode from the single-motor mode to the dual-motor mode, the control system controls the first motor in a manner such that a speed difference between an input speed and an output speed of the engagement device is reduced while increasing a torque transmitting capacity of the engagement device.