Abstract: A procedure for increasing the readiness of crossover gearshifts in an automatic transmission which, with the switching command or immediately thereafter, a motor fueling is provided through which a snatch operation of the disengaging switching element and/or an increase of the rotational speed gradient (turbine revolution speed) is achieved.

Abstract: An method for controlling a parallel hybrid drive-train of a vehicle comprising an automatic transmission and a combustion engine which is connected, via a first shifting device, to an electrical machine, which is connected, via a drive shaft, a starting clutch positioned in the transmission. To guarantee safety and high drive comfort of the vehicle during failure of the starting clutch, shifting failures of the starting clutch are monitored. If a shifting failure is recognized, predetermined contingency procedures are initiated and executed in which either continued drive of the vehicle or slowing down of the vehicle to a stop is possible. A device comprises a monitor with a sensor and parts for analyzing and recognizing shifting failures of the starting clutch. Control parts initiate and execute contingency procedures such that a continued drive operation or slowing down of the vehicle to a stop is possible.

Abstract: A method for operating a parallel hybrid drive train of a vehicle having an internal combustion engine, an electric engine and an output. The electric engine being located in the power drive between the output and the internal combustion engine. A second shifting element is located between the internal combustion engine and the electric engine and a first shifting element between the electric engine and the output. Output torque driving the output can be adjusted according to the transmitting capacities of the first and second shifting elements and according to the input torque of the electric engine and/or internal combustion engine. These adjustments are corrected according to standards derived from divergences found in parameters during operation of the drive train.

Abstract: A vehicle transmission having shifting elements (A-E) and a parking brake for locking a drive train output and a method for controlling the transmission. Activation of the parking brake depends on a driver's control action. Deactivating the parking brake, when the vehicle is on a slope greater or lesser than a preset value and depending on the slope, a combination of shifting elements (A, D) or (B, D) frictionally slip, such that the output rotates against the strain on a parking brake locking element, caused by the slope, to partially eliminate this strain. Next, one of shifting elements (C, A or B) engages locking the output. The parking brake is then released and finally, the engaged shifting element (C or A or B) is disengaged in a regulated manner, such that the output can be driven according to the driver's control action.

Abstract: A process for actuating a hydraulic storage device (5) of a transmission unit comprising a storage space (9) whose volume can be varied between a minimum and a maximum. The volume of the storage space can be changed by acting upon the storage space with pressurized hydraulic fluid from a pressure supply (19) of the transmission unit. To overcome a restoring tendency of the hydraulic storage device, the pressure is set to a threshold value. A holding device (12) holds the hydraulic storage device at least in the operating condition that corresponds to the maximum volume of the storage space against the restoring tendency. The storage space is acted upon by the pressure supply with a pressure corresponding to a threshold value (P_threshold) until the hydraulic storage device reaches the operating condition in which it can be held by the holding device.

Abstract: A method for operating a parallel hybrid powertrain (1) of a vehicle having one internal combustion engine (2) and one electric motor (3). The electric motor is located in the drivetrain between an output and the internal combustion engine. Between the internal combustion engine and the electric motor, a frictionally engaged shifting element is provided, while between the electric motor and the output, a starting element (6) having a hydrodynamic torque converter (6A) and a converter lock-up clutch (6B) is disposed. A target output torque to be applied to the output is dependent on the slippage of the starting element. During a starting phase of the internal combustion engine via the electric motor, an input torque produced by the electric motor is directed at least in part via the torque converter and in part via the converter lock-up clutch.

Abstract: A method is described for operating a parallel hybrid device train (1) of a vehicle having an internal combustion engine (2), an electric engine (3) and an output (5) wherein the electric engine (3) is disposed in the power train between the output (5) and the internal combustion engine (2) and both between the internal combustion engine (2) and the electric engine (3) and between the electric engine (3) and the output (5) is respectively provided a frictionally engaged shifting element (7, 8). In addition, a nominal output torque abutting on the output (5) can be adjusted according to the transmitting capacity of the first shifting element (8) located between the electric engine (3) and the output (5). According to the invention, the transmitting capacity of the first shifting element (8) is adjusted under control according to the nominal input torque required so that the first shifting element (8) has a transmitting capacity needed for producing the nominal output torque on the output (5).

Abstract: A method is described for the operation of a transmission device (3) with several shift elements (5, 6) actuated hydraulically by a pressure source (4) for engaging and disengaging various transmission ratios and with several electric actors (7, 8) of a hydraulic system of the transmission device (3) for the adjustment of actuating pressures for the shift elements (5, 6). When an engine start-stop function calls for a combustion engine (2) of a drivetrain comprising the transmission device (3) to be switched off, the energizing current of the actors (7, 8) is adjusted from an operating level (I_B) in which the respective actors (7, 8) are energized with a current appropriate for producing an operating-situation-dependent actuation pressure in the shift elements (5, 6), to a standby level (I_S). When the engine start-stop function calls for the combustion engine (3) to be switched on, the energizing current of the actors (7, 8) is adjusted from the standby level (I_S) to the operating level (I_B).

Abstract: A process for operating a power train of a vehicle, during an activated internal combustion engine (2) start/stop function. The power train includes the engine (2), which is started with torque from a starter (3), an output (5), and a non-positive shifting element (6A), having a continuously variable transmission, and a starting device (6) arranged between the engine (2) and the output (5). A portion of the torque from the engine (2) and/or the starter (3), depending on a set shifting element (6A) transmission capacity, is directed by starting device (6) toward the output (5). When there is a demand for starting the engine (2), the shifting element (6A) transmission capacity is adjusted to an amount at which at least a portion of the torque, generated by the starter (3), exceeding the needed torque to start the engine (2) during the startup procedure, is directed to the output (5).

Abstract: A method for operating power train side components of a motor vehicle. Using a control device of a motor, at least one motor parameter is issued and delivered via a databus to at least one control device of one other power drive side component working independently of the motor control device in order to operate all or each one of the power drive side components dependent. in a first inventive aspect, a behavior of the respective other power drive side components that adjusts itself according to the motor torque actually made available by the motor is evaluated. In second inventive aspect, the motor torque issued by the motor control device is compared with a torque stored according to motor operation parameters in the control device working independently of the motor control device.

Abstract: A method for operating an automatic transmission of a motor vehicle, in particular a variable-speed transmission. The automatic transmission includes at least five shift elements and to transfer torque or force transfer in a forward gear and a reverse gear at least three shift of the at least five elements are engaged. When shifting the automatic transmission from a neutral position to a forward or a reverse gear, at least one of the three shift elements of the automatic transmission that are engaged in the respective forward or reverse gear, is engaged in a controlled manner.

Abstract: A method for operating an automatic transmission of a motor vehicle, in particular a variable-speed automatic transmission. The automatic transmission has five shift elements and for transferring torque or force in a forward gear and in a reverse gear at least three of the five shift elements are engaged. In a neutral position of the automatic transmission, to prevent torque or force flow at least one of the shift elements that are engaged in the respective forward or reverse gear is fully disengaged.

Abstract: An automatic transmission of a motor vehicle driven by an internal combustion engine with a transmission oil circuit, a main oil pump, mechanically driven by a combustion engine, and an auxiliary oil pump (1) that can be electrically driven and is located inside an oil sump (4). It is proposed that the auxiliary oil pump (1) is arranged transversely with respect to the travel direction (x) of the motor vehicle.

Abstract: A method for controlling an automatic transmission of a motor vehicle, namely for controlling a static disengagement function, such that if the motor vehicle's speed is lower than a limiting speed value and if, at the same time, at least one further initiation criterion is fulfilled, static disengagement is implemented. As a further initiation criterion, it is checked whether a characteristic parameter of a hydrodynamical starting element, in particular a torque converter, is below a limiting value of the characteristic parameter.

Abstract: A method of operating an automatic transmission of a motor vehicle, in particular a variable-speed transmission. The automatic transmission includes at least five shift elements, at least three of which are engaged in a forward and a reverse gear to transfer torque or force. When disengaging gears for shifting the automatic transmission from a forward or reverse gear to a neutral position, at least one of the at least three shift elements that are engaged in the respective forward or reverse gear is completely disengaged.

Abstract: A hydraulic system in motor vehicles with at least one hydraulically actuated clutch, which entails minimized control complexity for supplying the clutch with hydraulic oil and which takes up less structural space. These characteristics are achieved essentially in that the pressure control of the hydraulically actuated clutch is effected directly and exclusively by an electrically driven and electronically controlled oil pump.

Abstract: A process for actuating a transmission mechanism having hydraulic shifting elements for changing gear ratios by using electric actuators to adjust the actuating pressures of the shifting elements. Upon a request from an engine start/stop function for shutdown of an engine, the flow of electrical current to the actuators is changed from an operating level to a standby level depending upon the operating pressure of the shifting elements. Upon the request for startup of the engine, the flow or electrical current is changed from the standby level to the operating level. A system pressure in the hydraulic system is zero when the engine is shutdown, and the power consumption in the transmission mechanism is lower at the standby level than the operating level.

Abstract: A braking method for a vehicle is proposed as a safety measure and replacement function if the brake system fails, in particular the X-by-wire brake system of a motor vehicle, in which the vehicle is braked with the help of the transmission by a defined engagement of frictional shift elements until the vehicle comes to rest, such that the combination of frictional shift elements actuated when the vehicle's working brake system fails does not correspond to the shift logic of a gear during normal driving operation of the vehicle.

Abstract: The invention relates to a drive control device for an automatic transmission for a motor vehicle, where the motor vehicle is provided with an automatic transmission having a main oil pump that can be driven by an internal combustion engine and an electrically drivable auxiliary oil pump, and comprises a hydraulic control device for the automatic transmission, further comprising a device for determining the required volumetric flow rate in order to determine the oil-hydraulic target volumetric flow rate during the current operating condition of the automatic transmission and the motor vehicle based on the oil temperature within the automatic transmission, comprising a device for determining the volumetric flow rate in order to determine the actual volumetric flow rate that can be delivered during the current operating condition of the automatic transmission and the motor vehicle by the main oil pump and/or the auxiliary oil pump, and comprising a device for controlling the target volumetric flow rate in order

Abstract: A method for controlling and regulating a power train of a hybrid vehicle and a power train of a hybrid vehicle having one internal combustion engine, one electric machine, one shifting element and one output in a power flow of the power train and designed with continuously variable transmitting capacity and one clutch device and the internal combustion engine. The electric machine can be operatively interconnected via the clutch device, the hybrid vehicle being optionally driveable via the electric machine and/or via the internal combustion engine and the internal combustion engine can be started via the electric machine. In the operation of the power train, the transmitting capacity of the shifting element during the starting operation of the internal combustion engine is adjusted so that on the output of the power train, a torque abuts which is independent of the starting operation of the internal combustion engine.