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.

Abstract: The invention relates to a clutch transmission and a method of operating the same. The clutch transmission has a transmission element that is accommodated in a transmission chamber, a clutch element accommodated in a clutch chamber, and a hydraulic controller comprising an oil pump. The purpose is to provide pressures and volume flows in the clutch transmission, in which, in order to cool the clutch element, the oil pump sucks in oil and pumps it into the clutch chamber. In order to reduce churning losses in the transmission chamber to prevent air from being sucked in by the oil pump, an intake chamber is operatively connected to an oil outlet of the clutch chamber in order to receive the oil that leaves the clutch chamber.

Abstract: The invention relates to a hydraulic control apparatus (1) for a shifting fork (7) for engaging/releasing at least one gear (G) in a manual transmission, comprising at least one shifting cylinder (2, 3) and a piston unit (6) which can move within the shifting cylinder and is connected to the shifting fork (7), and at least one control valve (8) for generating a modeled pressure which can be applied to the piston unit (6) in order to actuate the shifting fork (7). To prevent jolting when the piston unit is started up, the invention proposes a valve apparatus which provides a counter-pressure which counteracts the movement of the piston unit (6). In a preferred exemplary embodiment, a diaphragm ensures that the counter-pressure drops below the value preset by the valve apparatus at low speeds on the part of the piston unit.

Abstract: The invention provides a change gear, in particular in motor vehicles. This transmission comprises input and output shafts, a drive shaft that is in torque transmitting connection with the first and second output shafts; a first group of gear sets comprising at least one first gear set; a second group of gear sets comprising at least one second gear set; an itermediate shaft; and a first gear section. The input shaft is connectable with the first output shaft by the first group of gear sets. A second gear section is providcd in which the intermediate shaft is connectable to the second output shaft by the second group of gear sets. The intermediate shaft is in gearing connection with the first input shaft.

Abstract: In a transmission during a shifting process while torque is transferred from a power-outputting clutch, which is initially in the adhered state, to a power-receiving clutch, which is initially open, the power-receiving clutch increases torque capacity in a slip region, and the power-outputting clutch decreases torque capacity during an initial phase of the transfer of torque while its torque capacity is greater than necessary to maintain its adhered state. In the final state of the transfer of torque, the power-receiving clutch transmits the entire drive torque.

Abstract: A multiple speed transmission includes first and second concentric input shafts, an output shaft, an auxiliary shaft, a first clutch for driveably connecting and disconnecting the first input shaft, and a second clutch for driveably connecting and disconnecting the second input shaft. First pairs of mutually engaged gears include a first member supported on the first input shaft, and a second member supported on the output shaft. Second pairs of mutually engaged gears includes a first member supported on the second input shaft, and second member supported on the output shaft. A gear wheel, supported on the auxiliary shaft, engages a gear of a second pair on the second input shaft. A planetary gearset includes a ring gear driveably engaged with a member of the first pair on the first input shaft. The carrier of the gearset is held against rotation in reverse drive and released in forward drive.

Abstract: A sensor arrangement (10) for determining the selector drum position of a selector drum, in particular of a transmission controller, having a sensor disc (11) that is operatively connected to the selector drum and identifies different selector states by means of a running track (14), and a sensing device (12) that continuously senses the running track (14) in order to register the position data from the running track (14) which identifies the switching states.

Abstract: A sensor arrangement (10) for determining the selector drum position of a selector drum, in particular of a transmission controller, having a sensor disc (11) that is operatively connected to the selector drum and identifies different selector states by means of a running track (14), and a sensing device (12) that continuously senses the running track (14) in order to register the position data from the running track (14) which identifies the switching states.