Abstract: An automated gear shift transmission and method of controlling the same are described. The transmission is installed in a motor vehicle comprising several forward gears and at least one reverse gear and that allows choosing from several different driving modes by means of a driving mode selector lever. A forward gear is maintained in engagement in case of an uphill orientation of the motor vehicle when the parking mode is chosen. Instead of the forward gear, a reverse gear is maintained in engagement in case of a downhill orientation of the motor vehicle when the parking mode is chosen. This allows taking specific driving conditions or driving situations into account with relatively simple means.

Abstract: A method of controlling a clutch in a motor vehicle and a motor vehicle adapted to perform this method are suggested, in particular resulting in a good starting phase action for supercharged diesel motors. The method comprises the method steps of: setting a clutch torque that is transmitted by a clutch by a plurality of clutch characteristics; determining by a respective clutch characteristic the clutch torque for a particular motor load depending on the rotational speed of the motor; dividing the clutch characteristics into a low speed range and into a full load range; increasing within the low speed range at a constant rotational speed of the motor the transmitted clutch torque with increasing the motor load; and transmitting in the full load range in comparison to the low speed range lower clutch torques at the same rotational speed of the motor.

Abstract: A method for shifting gears in a dual clutch transmission within a motor vehicle and a motor vehicle implementing said method are suggested providing a smooth transition between gears particularly in the starting phase. The dual clutch transmission comprises a first clutch and a second clutch as well as a first partial transmission having a first and other gears and a second partial transmission having a second and other gears. The clutches are controlled to a) decrease a torque transmitting capacity of the first clutch; b) increase a torque transmitting capacity of the second clutch; c) adapt the rotational speed of the motor in direction of a rotational speed of an input shaft of the second partial transmission via increasing the torque transmitting capacity of the second clutch; and d) control the torque transmitting capacity of the second clutch to a final torque value.

Abstract: An analyzing method for a sensor system determining the position of a shifting fork in a shift transmission is suggested wherein a shifting fork can be moved from a neutral position into at least one gear position. The position of the shifting fork is determined by a sensor system comprising at least one magnet and at least one magnetic field sensor that can be moved relative to the magnet. The method includes storing a base diagram for a base output signal in relation to position s and correcting the measured output signal so that the base diagram can be used for determining with high accuracy the position of the shifting fork.

Abstract: A method and a motor vehicle applying that method for preventing an uncontrolled rollback of a motor vehicle is suggested, said method comprising means for influencing the torque transmission by a drive train. In case a rollback action is detected, namely a movement in opposite direction as the predetermined direction of movement, the transmission of torque is influenced such that a torque is transmitted via the drive train acting against the rollback direction and the torque does not exceed a defined maximum value. The control allows a controlled rollback by making the intervention by the system to be perceived little disturbing, but at the same time in particular in case of strong incline of the road does not render the driver non-informed about the actual incline.

Abstract: A method for determining the filling pressure for a clutch and a hydraulic clutch adapted to conduct said method are suggested where clutch linings are brought into engagement against the force of a clutch release spring by a hydraulic pressure system. The hydraulic pressure is controlled such that an engagement point where the clutch linings abut against each other but without establishing a torque transmitting capacity in the clutch can be reached quickly and precisely. The purpose is to achieve a short gear shifting time, but at the same time avoid impacts due to premature torque transmittal capacity in the clutch during gear shifting. A precision shifting mode or a fast shifting mode can be established, compromising speed and torque transmitting capacity depending on the preferred driving mode.

Abstract: A method for shifting a gear into a gear position in an automated shift transmission with several gears and an automated shift transmission adapted to perform said method are suggested. Via a shifting fork, a shifting sleeve can be shifted from a neutral position into respective gear positions and reaches on its way a pull-in position where the shifting sleeve is automatically forced in direction of the gear position. It is achieved that the pull-in position is safely reached by checking whether the shifting fork has reached a first threshold value, a second threshold value, and whether it has come to a standstill therebetween. Accordingly, an increased shifting force can be applied. Albeit allowing production tolerances in the transmission, the respective gear position is safely reached.

Abstract: A method for gear shifting a dual clutch transmission from an initial gear into a target gear and a respective dual clutch transmission are described. The dual clutch transmission comprises a first partial transmission and a second partial transmission. When shifting from an initial gear into a target gear which are both allocated to the first partial transmission, gears are shifted at least for a short time period into the support gear prior to gear shifting from the support gear into the target gear. A process of an uninterrupted reduction of the transmitted clutch torque down to zero at a first clutch allocated to the initial gear is started prior to starting a process of closing the second clutch allocated to the support gear.

Abstract: A clutch device is described comprising a first clutch element, a second clutch element that is disposed in a coaxial manner in relation to the first clutch element, a first engagement means, a second engagement provided for engaging with the first engagement in a positively interlocking manner for transmitting a torque between the first clutch element and the second clutch element, and a spring biasing the first engagement element and the second engagement element in a circumferential direction against each other. The spring comprises a leg spring with a ring part and two legs, wherein the ring part is disposed in a substantially coaxial relation to the first and second clutch parts and the legs extend in a radially outward direction.

Abstract: A hydraulic control apparatus for an automatic dual clutch transmission, comprising a first clutch with a first partial transmission and a second clutch with a second partial transmission, as well as a shifting system for engaging/disengaging gears of the two partial transmissions, a control unit having a first pressure regulator and a second pressure regulator actuating the first and second clutches and actuating the shifting system, and a switching apparatus. The shifting apparatus comprises a first changeover valve and a second changeover valve. Both changeover valves can be shifted from a first to a second position for allowing a safe emergency running mode of a motor vehicle in case of any failure of the first or second pressure regulator.

Abstract: The present invention relates to a hybrid drive train for a motor vehicle, comprising a clutch arrangement having a first rotatable clutch part and a second rotatable clutch part, which clutch parts can be separated from one another and which can be connected to one another, and comprising an electrical machine which is arranged concentrically with respect to the first clutch part and has a rotor, wherein the rotor is connected with the first clutch part and comprises a plurality of magnetic flux influencing portions, the magnetic flux influencing portions being arranged distributed over the circumference of the rotor with a predetermined rotor pitch. Here, the first clutch part comprises a shaft toothing that is adapted to the rotor pitch.

Abstract: A dual clutch transmission is described having first and second input shafts and allowing at short axial length many degrees of freedom for providing various transmission ratios of the individual driving gears. A loose wheel of a reverse driving gear is provided on a third drive shaft and engages a first gear wheel of a step wheel. A fixed wheel of a second forward driving gear is provided on one of the input shafts and is engaged by a second gear wheel of a step wheel. The step wheel is switchable by a first gear shifting clutch that is provided on the second drive shaft and is designed as a first single gear shifting clutch allowing to connect only the step wheel in a rotationally fixed manner to the second drive shaft such that the step wheel co-rotates with the second drive shaft.

Abstract: A clutch support for supporting a clutch hub of a clutch such that the clutch hub is rotatable is described. The clutch hub comprises a flange that is fixable at clutch housing or the like; a substantially cylindrical element for receiving the clutch hub such that the clutch hub is rotatable; and a sleeve with at least one groove formed therein for providing at least one channel that allows oil to be supplied to the clutch through this channel. The sleeve is manufactured substantially without any chip removing machining action. This achieves the goal to provide a clutch support that can be manufactured in a simple manner and at comparatively low cost.

Abstract: A dual clutch transmission comprising a first partial transmission and a second partial transmission is described. A first group of forward gears is allocated to the first partial transmission, a second group of forward gears is allocated to the second partial transmission, each one of the forward gears comprises a particular transmission ratio, two adjacent forward gears comprise adjacent transmission ratios with no transmission ratio of any other forward gear in between, and at least two adjacent forward gears are allocated to the second partial transmission. The invention comprises further a control method for controlling the dual clutch transmission such that a torque transmitting gap is closed when gear shifting between the aforementioned two adjacent gears.

Abstract: A shift pad for a gear shift element is described, comprising: a pad section that is configured to engage a circular groove of a gear shift sleeve; a locking section for securing the shift pad to the gear shift element; and a locking element that is connected to the locking section in a fixed manner and is adapted to be subjected to plastic deformation for securing the shift pad to the gear shift element. Further, a gear shift element for a gear shift device comprising the above shift pad is described. Detaching of the shift pad from the shift element during the transportation or the assembly process is prevented by this design.

Abstract: A gear shift mechanism of a gear shift transmission having a plurality of gears is described. A first movable gear shift fork and at least one second movable gear shift fork are provided for engaging gears of the gear shift transmission and assuming a neutral position as well as an engaged position where a gear allocated to a respective one of the first and second gear shift forks is engaged. A locking mechanism comprising a locking element is provided that prevents that both gear shift forks can assume at the same time unintentionally an engaged position. The locking mechanism is designed such that in a locking position a force for moving the first gear shift fork out of its neutral position does not generate a resulting component of force that would force the locking element against the second gear shift fork.

Abstract: An automated gear shift transmission and method of controlling the same are described. The transmission is installed in a motor vehicle comprising several forward gears and at least one reverse gear and that allows choosing from several different driving modes by means of a driving mode selector lever. A forward gear is maintained in engagement in case of an uphill orientation of the motor vehicle when the parking mode is chosen. Instead of the forward gear, a reverse gear is maintained in engagement in case of a downhill orientation of the motor vehicle when the parking mode is chosen. This allows taking specific driving conditions or driving situations into account with relatively simple means.

Abstract: The invention relates to a hydraulic control device for an automatic dual-clutch transmission which has a first clutch and a second clutch, having a control valve unit which predefines at least one hydraulic parameter such as pressure and/or one volume flow. Regulating this parameter engages or disengage the clutches. An additional separating valve can is provided assuming a normal position when the second control signal is applied, so that at least one of the clutches can be operated by means of the control valve unit. The purpose is to provide enhanced operational safety against misoperation while at the same time secure availability of the clutches.

Abstract: A dual clutch for a transmission with a first transmission input shaft and a second transmission input shaft that is positioned in coaxial relation to the first transmission input shaft. The dual clutch comprises a clutch portion comprising a hollow cylinder portion for transmitting torque, wherein the hollow cylinder portion is provided in a radial position between a clutch axle and a clutch hub, is rotatable in relation to the clutch axle and the clutch hub, and comprises at least one opening allowing oil to be fed from the clutch axle to the clutch hub. This design allows supply of hydraulic oil, sufficient cooling oil, and at the same time flexibility in attaching auxiliary engines such as an electromotor to the dual clutch.

Abstract: The invention relates to a hydraulic control device for an automatic dual-clutch transmission which has a first clutch and a second clutch, having a control valve unit which predefines at least one hydraulic parameter such as pressure and/or one volume flow. Regulating this parameter engages or disengage the clutches. An additional separating valve can is provided, and by means of a first switching valve to be operated by means of at least one further control signal the first clutch can be regardless of the switching position of the separating valve. The purpose is to provide enhanced operational safety against misoperation while at the same time secure availability of the clutches.