The present invention provides for a method and apparatus for preventing damaging of a gear box of a vehicle provided with a servo-actuated clutch system and a servo-actuated gear shift system, the servo-actuated clutch comprising a clutch-servo housing a pneumatic piston, movable between a first and a second positions corresponding to an open and a closed system of the clutch. The functioning of servo-actuated gear shift system is enabled when the pneumatic piston position exceeds, toward said disengagement state, a third predefined position.

The present invention provides for a method and apparatus for preventing damaging of a gear box of a vehicle provided with a servo-actuated clutch system and a servo-actuated gear shift system, the servo-actuated clutch comprising a clutch-servo housing a pneumatic piston, movable between a first and a second positions corresponding to an open and a closed system of the clutch. The functioning of servo-actuated gear shift system is enabled when the pneumatic piston position exceeds, toward said disengagement state, a third predefined position.

A shift control device includes: a selector configured to receive operation of selecting a shift range of an automatic transmission and output selection information corresponding to the operation, the automatic transmission being configured to convert and output driving force of an engine; a range switch controller configured to switch the shift range in accordance with the selection information; a parking mechanism configured to bring the automatic transmission into a parking state by locking rotation of the automatic transmission; a clutch configured to turn on/off transmission of driving force; a clutch controller configured to control operation of the clutch in accordance with the selection information; and a delay setter configured to set delay time until driving of the parking pawl starts on the basis of rotation speed difference and oil temperature of the automatic transmission when selection information indicating that the parking range is selected is output.

A power transmission device for a hybrid vehicle with a first clutch (1a) and a second clutch (1b). The first clutch (1a) is capable of transmitting or cutting off driving power of an engine (E) to driving wheels (D). The second clutch (1b) is capable of transmitting or cutting off power of a motor (M) to the driving wheels (D). The power transmission device is capable of appropriately operating the first clutch (1a) and the second clutch (1b) in accordance with driving conditions of the vehicle. When the engine (E) is started by transmitting power from the motor (M) to the engine (E), via the first clutch (1a) and the second clutch (1b), the power transmission device slip-controls the first clutch (1a) and the second clutch (1b).

A shift control method for a vehicle with a Dual Clutch Transmission (DCT) includes comparing, by a controller, a current clutch temperature with a first predetermined reference value and a second predetermined reference value, the second predetermined reference value being greater than the first reference value, preventing, by the controller, coaxial power-on downshifting when the clutch temperature is greater than the first reference value, and reducing, by the controller, a shift time by preventing coaxial power-on downshifting when the clutch temperature is greater than the second reference value and then increasing a shift speed when biaxial full skip shifting is required.

A shift control method for a vehicle with a Dual Clutch Transmission (DCT) includes comparing, by a controller, a current clutch temperature with a first predetermined reference value and a second predetermined reference value, the second predetermined reference value being greater than the first reference value, preventing, by the controller, coaxial power-on downshifting when the clutch temperature is greater than the first reference value, and reducing, by the controller, a shift time by preventing coaxial power-on downshifting when the clutch temperature is greater than the second reference value and then increasing a shift speed when biaxial full skip shifting is required.

A vehicle and a method of controlling a powertrain are provided. The vehicle may include a controller programmed to operate a powertrain in a hybrid mode. The controller may be further programmed to, responsive to a request to operate the powertrain in electric mode, transition powertrain operation from the hybrid mode to the electric mode without shifting gears until a change in accelerator pedal position exceeds a threshold following the transition.

A vehicle and a method of controlling a powertrain are provided. The vehicle may include a controller programmed to operate a powertrain in a hybrid mode. The controller may be further programmed to, responsive to a request to operate the powertrain in electric mode, transition powertrain operation from the hybrid mode to the electric mode without shifting gears until a change in accelerator pedal position exceeds a threshold following the transition.

A method for operating a vehicle having a dual-clutch transmission (DCT). The DCT includes first and second clutches; a first shaft operatively connected to the first clutch, the first clutch being selectively actuated to couple the first shaft to a clutch input member; a second shaft operatively connected to the second clutch, the second clutch being selectively actuated to couple the second shaft to the clutch input member; first and second driving members mounted to the first and second shafts respectively; and an output shaft operatively connecting the first and second driving members to a ground-engaging member of the vehicle. The method includes determining if the vehicle is substantially stationary; and in response to being substantially stationary, actuating the first and second clutches to cause simultaneous driving engagement of both the first and second shafts with the output shaft to thereby lock the output shaft.

A method for operating a vehicle having a dual-clutch transmission (DCT). The DCT includes first and second clutches; a first shaft operatively connected to the first clutch, the first clutch being selectively actuated to couple the first shaft to a clutch input member; a second shaft operatively connected to the second clutch, the second clutch being selectively actuated to couple the second shaft to the clutch input member; first and second driving members mounted to the first and second shafts respectively; and an output shaft operatively connecting the first and second driving members to a ground-engaging member of the vehicle. The method includes determining if the vehicle is substantially stationary; and in response to being substantially stationary, actuating the first and second clutches to cause simultaneous driving engagement of both the first and second shafts with the output shaft to thereby lock the output shaft.