Abstract: A method of operating a drive train of a motor vehicle with a hybrid drive having an internal combustion engine, an electric motor, an automatic transmission. The drive train also having a clutch between the internal combustion engine and the electric motor, and a clutch or a torque converter between the electric motor and the automatic transmission. This arrangement enabling the internal combustion engine to be started by engaging the clutch arranged between the internal combustion engine and the electric motor, when the drive train is powered exclusively by the electric motor. The braking power, generated during an upshift in response to a drop in the rotational speed of the drive train components, is used to start the internal combustion engine, such that the energy required from the electric motor for starting the combustion engine is minimized.

Abstract: A method for operating a vehicle drivetrain (1) having a drive motor (9), a transmission (10) and a drive output (2). When a gear ratio change is called for in the transmission (10), between an actually engaged gear and a target gear, one of a frictional or an interlock-type shift element is engaged in a flow of force in the vehicle drivetrain (1) and the other of an interlock-type or a frictional shift element is disengaged from the flow of force in the vehicle drivetrain (1). An actual speed that is at least equivalent to a transmission input speed is monitored and an actuation pressure of the frictional shift element involved in the shift operation and/or a torque of the drive motor (9) is/are varied to change the actual speed to a nominal speed.

Abstract: A transmission apparatus (10) having at least one form-lock shifting element (12) that can be actuated by a hydraulic system (11) which, in the region of a piston chamber, can be subjected to hydraulic pressure (p—12) via a hydraulic fluid-conducting feed line (20) and which can be actuated from a disengaged to an engaged operating state. The hydraulic fluid-conducting feed line (20) of the shifting element (12) is effectively connected to a damping device (22) by which pressure fluctuations, of the hydraulic pressure (p—12) in the feed line (20), can be at least partially compensated.

Abstract: A transmission device (10) having at least one form-fitting shifting element (12) which is hydraulically actuated via a hydraulic system (11) with hydraulic pressure (p—12), in the area of a piston chamber, via a feed line (20) that conveys hydraulic fluid, to shift from a disengaged to and engaged operating state. A non-return valve device (27) is arranged upstream of the form-fit shifting element (12).

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: The invention describes a method for operating a transmission's valve system of a vehicle's drive train through a valve unit and said valve unit's electro-magnetic activator configuration. In a transmission's hydraulic system and being part of the vehicle's drive train, its hydraulic pressure value (p_EDS) can be employed and adjusted through a valve unit's configuration by applying to the electro-magnetic activator system a pulse-width-modulated current signal (i_EDS). The pulse-width modulated current signal (i_EDS) and its signal's amplitude (A) and/or its pulse duration (pw1) will periodically change during the applied Dither-Modulation, by maintaining at the same time the required pressure value (p_EDS), whereby a horizontally moving anchor, which is attached the valve system's valve shaft, receives hereby an imposed vibrating oscillation. As shown in this invention, the Dither-Modulation will be activated or deactivated accordingly during pre-defined operating conditions of the vehicle's drive train.

Abstract: A method for controlling the shift sequence of a multispeed automatic gearbox in which, to reach a target gear called for, multiple shifts through one gear-step can be carried out. A target gear from a currently engaged gear is proposed and, which is several gear-steps away from this current gear, is engaged as a function of the current driving situation, optionally by a direct multiple shift in one step or by a combination of several successive single shifts each of only one gear-step or by a combination of several successive double or multiple shifts each of two or more than two gear-steps or by a combination of at least one double or multiple shift and at least one single shift or by a combination of at least one double shift and at least one multiple shift.

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: 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: Described is a method for operating a multi-step automatic transmission, particularly an automatic transmission of a drive train of a vehicle with a combustion engine. In downshifting from the third gear ratio to a second gear ratio, higher inertias must be shifted than when shifting from the third gear ratio to the first gear ratio. According to the invention, when there is a demand for a coasting downshift from the third gear ratio to the second gear ratio or to the first gear ratio with no performance demand on the combustion engine, the coasting downshift to the second gear ratio is not executed, and the first gear ratio is engaged when the requirements for downshifting to the first gear ratio are met.

Abstract: A method for monitoring and diagnosing errors of drive train components of a motor vehicle by monitoring a transmission route of a drive train control signal by reading an actual value of a monitored output signal at an output of the transmission route of the drive train control signal, determining by a calculation algorithm a nominal output value corresponding to the monitored output signal resulting from a check variable inserted into the transmission route before the output of the transmission route wherein the calculation algorithm is selected such that the nominal output value represents a value of the monitored output signal for the current value of the check variable, and performing a plausibility check of the monitored output signal by determining whether the actual output value is within an acceptable value of the nominal output value for the current value of the check variable.

Abstract: The invention concerns a process for pressure actuation of a rotating shifting element of an automatic transmission or automated manual transmission, in which the shifting element is configured with a piston that interacts with a torque transfer element and a pressure medium supply, by way of which the piston can be actuated with pressure medium in order to be displaced into a positioned defined for an activated state of the shifting element, and in which a pressure pulse can be induced in the pressure medium supply in a de-activated state of the shifting element. It is proposed that the pressure medium pulse be triggered when the pressure medium amount drained from the de-activated shifting element has reached a predefined value.

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: A method for monitoring frictional engagement in an automatic or automated motor vehicle transmission having a hydrodynamic starter element when the transmission is in a preset neutral or parking position and the automatic or automated motor vehicle transmission controlled by this method. When the motor vehicle is at or close to a standstill in a preset neutral or parking position, the current transmission rotational input speed and a current engine rotational speed of the drive motor are determined and based on the speed ratio between the current transmission rotational input speed and the current engine rotational speed an error is found to be present if the speed ratio is less than a predefined threshold value, which is less than/equal to 1.

Abstract: An automatic gearbox for a vehicle with at least one hydraulically actuated shifting element made as a transmission brake or transmission clutch. The shifting element has an inner disk carrier and an outer disk carrier where inner disks and outer disks are arranged rotationally fixed but axially displaceably. The disks are arranged in alternating sequence one after the otherto form a disk pack which can be acted upon by an actuator with an axial actuation force to engage the shifting element, and in which one disk carrier is connected to one of a non-rotating or a rotating gearbox component and the other disk carrier can be connected, via a synchronization device, to a rotating gearbox component. To reduce the shifting time that can be achieved with such a gearbox when carrying out a transmission ratio change process, a synchronization device is actuated by way of a second actuator.

Abstract: A method of operating a motor vehicle drive train having a hybrid drive including an internal combustion engine, an electric motor and an automatic transmission. A clutch is located between the internal combustion engine and the electric motor, and a clutch or a torque converter is located between the electric motor and the automatic transmission such that, when the drive train is powered exclusively by the electric motor, the internal combustion engine can be started by engagement of the clutch located between the internal combustion engine and the electric motor. The clutch, arranged between the internal combustion engine and the electric motor, is engaged during the process of downshifting when the internal combustion engine is started.

Abstract: A method of operating a drive train of a motor vehicle with a hybrid drive having an internal combustion engine, an electric motor, an automatic transmission. The drive train also having a clutch between the internal combustion engine and the electric motor, and a clutch or a torque converter between the electric motor and the automatic transmission. This arrangement enabling the internal combustion engine to be started by engaging the clutch arranged between the internal combustion engine end the electric motor, when the drive train is powered exclusively by the electric motor. The braking power, generated during an upshift in response to a drop in the rotational speed of the drive train components, is used to start the internal combustion engine, such that the energy required from the electric motor for starting the combustion engine is minimized.

Abstract: A process for monitoring a direction of drive from an automatic or automated vehicle transmission at near-zero vehicle speed via an engaged gear. A desired direction of drive of the transmission is determined from an engaged gear at the time the vehicle begins motion. An actual direction of drive is determined from the transmission and if different from the desired direction of driver an error signal is produced. The process including determining the actual drive either from a sensed rotational direction of a transmission input shaft and a sensed rotational direction of a transmission output shaft or a sensed valve setting, a sensed pressure in an transmission electro-hydraulic control system or on a transmission shifting element or from a sensed direction of rotation of a transmission gearset element or from axial movement or force of a transmission constructional element.