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 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: 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.

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: 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: The invention relates to a method for reaching a neutral position N located between two end positions of a gearshift fork in a shift transmission in a motor vehicle from a starting position of the gearshift fork. The method allows finding the neutral position of the gearshift fork without a sensor determining the position of the gearshift fork or in the alternative in case such the sensor is defect.

Abstract: A twin-clutch transmission, in particular for a motor vehicle, with a twin-clutch arrangement comprising a first and a second clutch, and a first and a second drive unit designed as an electric machine with a stator and a rotor. The rotor of the first drive unit is fixed to an input side of the transmission that is connected to an engine so that it rotates always at the rotational speed of the engine. The twin-clutch transmission can be switched back and forth between a serial and a parallel hybrid mode, these modes being established by means of the first and second drive units. The drive shaft of the second drive unit and the clutches have different rotational axes.

Abstract: A hydraulic control apparatus and method of controlling it for an automatic dual clutch transmission, which includes 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/releasing gears of the two partial transmissions. A first switching valve in a first position AI connects a first pressure regulator to the first clutch and disconnects it from the shifting system and in a second position BI connects the first pressure regulator to the shifting system and disconnects it from the first clutch, and that a second switching valve in a first position AII connects a second pressure regulator to the second clutch and disconnects it from the shifting system and in a second position BII connects the second pressure regulator to the shifting system and disconnects it from the second clutch.

Abstract: The invention relates to a twin-clutch transmission, in particular for a motor vehicle, comprising: a twin-clutch arrangement with clutches, input shafts, at least one output shaft, a number of gearwheel pairs and drive units. The first drive unit is connected to the input side of the twin-clutch arrangement and the second drive unit is connected to one of the input shafts or to the output shaft. The invention relates also to a methods for controlling the twin-clutch transmission, for example with the steps of disengaging the first clutch and the second clutch if these are engaged, and starting the engine by means of the first drive unit.

Abstract: The invention relates to a switching-valve arrangement for a shifting system of an automatic transmission having a first actuator for engaging and releasing gears, at least a second actuator for engaging and releasing gears, a first activatable switching valve, a second activatable switching valve, a first signal element, and a second signal element. By means of the signal elements and switching valves the first and second actuators can be pressurized. In case of failure of one of the signal elements one of the actuators can always be pressurized and even in case of erroneous operation of the first and second signal elements only one of the actuators can be pressurized at the same time.

Abstract: The invention concerns a method of controlling a twin-clutch transmission (10). When the torque transmitted in a first transmission path (C1, E2, Z8, Z9, S2, Z3, Z4) reaches an upper limit given by the torque transmission capacity of that path further additional torque produced by an engine at the drive shaft (I) is transmitted by closure of the second clutch (C2) to the output shaft (O) in parallel relationship by way of a second transmission path (C2, E1, Z1, Z2, S1, Z3, Z4). That permits the output of the engine to be better utilised and makes it possible to achieve better travel characteristics.

Abstract: A hydraulic system for providing pressure and volume flows in a double-clutch transmission. A first clutch and a second clutch are preceded by at least one changeover valve which, in a first state, guides lubricating flow to the first clutch and cooling flow to the second clutch, and, in a second state, guides lubricating flow to the second clutch and cooling flow to the first clutch. The cooling flow is preferably variable.

Abstract: The invention relates to a hydraulic system (1) for providing pressures and volumetric flows in a dual clutch transmission, in particular for providing a first volumetric flow for cooling and lubricating a first clutch (2) and for providing a second volumetric flow for cooling and lubricating a second clutch (3). The hydraulic system is distinguished by the fact that at least one switching valve (4), which in a first position guides a lubricating flow onto the first clutch (2) and a cooling flow onto the second clutch (3) and in a second position guides the lubricating flow onto the second clutch (3) and the cooling flow onto the first clutch (2), is connected upstream of the first clutch (2) and the second clutch (3). The cooling flow is preferably variable.

Abstract: A change-speed gearbox, in particular for motor vehicles such as hybrid passenger cars and small trucks, comprising input and output shafts, clutches, and gear wheel pairs with fixed and loose wheels. The gearbox provides at least one forward gear by means of the gear wheel pairs, has a gear box unit for a second forward gear, and has in addition an auxiliary drive.