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: The invention concerns a method for the automatic control of a neutral position and a parking lock of an automatic or automated motor vehicle transmission, such that the neutral position and the parking lock of the transmission provided in order to immobilize the motor vehicle can be engaged as a function of a drive setting selected by the driver of the motor vehicle using a selector device, and as a function of other operating parameters of the vehicle. In addition, the invention concerns a motor vehicle controlled by the method.

Abstract: A method of automatically controlling a neutral position and parking lock of an motor-vehicle transmission to immobilize the vehicle depending on a drive position of the transmission selected by the driver with a selector device and subject to other operating parameters of the motor vehicle. Only when simultaneously the vehicle is essentially stationary, an ignition circuit is electrically interrupted and the selector device is in a “Neutral” position, can an Neutral-holding phase be activated, in which the transmission is in a non-frictionally engaged neutral position as long as the parking lock of the transmission has not yet been engaged. If the Neutral-holding phase has not been activated, the transmission remains non-frictionally connected in the Neutral position until the driver at least intends to exit the vehicle, at which time the parking lock of the transmission is automatically engaged.

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 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: 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 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: A process is described 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 (9) can be changed from minimum to maximum by acting upon the storage space (9) with pressurized hydraulic fluid from a pressure supply (19) of the transmission unit. To overcome a restoring tendency of the hydraulic storage device (5) starting from an operating condition different from the operating condition which corresponds to minimum volume of the storage space (9) toward an operating condition which corresponds to minimum volume of the storage space (9), the pressure has to be set to a threshold value. A holding device (12) is provided to hold the hydraulic storage device (5) at least in the operating condition that corresponds to maximum volume of the storage space (9) against the said restoring tendency.

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 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.

Abstract: A method for operation of a drivetrain, comprising an automatic transmission and a drive motor, for improving the shift speed of successive upshifts or downshifts such that during a first shift at least one shift element required for a successive shift is prepared such that when a synchronization point is reached, the successive shift is immediately carried out. Two successive shifts can be carried out as overlapping single shifts by actuating three shift elements such that: a) during the first shift a first shift element is either disengaged or engaged while the second shift element is either engaged or disengaged; b) during the successive shift a second shift element is prepared for disengagement or engagement while the third shift element is prepared for engagement or disengagement; and c) the actuation of the second shift element, when transiting from the first to the successive shift, takes place by a desired selection.

Abstract: A method for operation of a drivetrain, comprising an automatic transmission and a drive motor, for improving the shift speed of successive upshifts or downshifts such that during a first shift at least one shift element required for a successive shift is prepared such that when a synchronization point is reached, the successive shift is immediately carried out. Two successive shifts can be carried out as overlapping single shifts by actuating three shift elements such that: a) during the first shift a first shift element is either disengaged or engaged while the second shift element is either engaged or disengaged; b) during the successive shift a second shift element is prepared for disengagement or engagement while the third shift element is prepared for engagement or disengagement, the actuation of the second shift element, when transiting from the first to the successive shift, takes place by a desired selection.

Abstract: A method for operating a motor vehicle drivetrain comprising at least an automatic transmission and a drive assembly. The automatic transmission includes at least five shifting elements to transmit torque and/or power. In each forward and reverse gear, three shifting elements are engaged and the remaining two shifting elements are disengaged. Two consecutive gearshifts are carried out through selection of the five shifting elements. During a first gearshift, implemented as a multiple gearshift, a subsequent second gearshift, implemented as either a single or multiple gearshift, is prepared. During the first gearshift, a first shifting element is disengaged, a second shifting element is engaged, a third shifting element is prepared for disengagement in a subsequent second gearshift and a fourth shifting element is prepared for engagement. Further, during the first gearshift and the subsequent second gearshift, a fifth shifting element is retained in at least a substantially engaged state.

Abstract: A method for operation of a drivetrain including a drive motor and an automatic transmission having at least five shift elements, of which, at least two elements are disengaged in each forward and reverse gear and the other shift elements are engaged. Two successive shifts are accomplished by two overlapped single gear shifts such that: a) during the first shift, a first shift element is engaged or disengaged while a second shift element is disengaged or engaged; b) during the first shift, second and third shift elements are prepared for either engagement or disengagement; and c) during the first and the second shifts at least one fourth shift element is kept engaged or nearly engaged.

Abstract: A method for operating a multi-speed automatic transmission of a motor vehicle. The automatic transmission has multiple shift elements for transmitting torque and/or power. When in forward and reverse gears, a first number of shift elements are engaged, and a second number of shift elements are disengaged. To improve the shift speed of successive upshifts and/or successive downshifts which are implemented in an overlapped manner, during a first upshift and/or downshift, at least one shift element, necessary for a successive second upshift and/or downshift, is prepared during the first upshift and/or downshift such that when the first upshift and/or downshift reaches a synchronous point, immediate implementation of the successive second upshift and/or downshift is possible. Depending on a gear change to be implemented, the first upshift and/or downshift from a current gear to a desired gear is preferably implemented as a multiple shift rather than a single shift.

Abstract: A method for operation of a drivetrain including a drive motor and an automatic transmission having at least five shift elements, of which, at least three shift elements are engaged in each forward and reverse gear and the other shift elements are disengaged. Two successive shifts are accomplished by two overlapped single gear shifts such that a) during the first shift, a first shift element is engaged or disengaged while a second shift element is disengaged or engaged; b) during the first shift, second and third shift elements are prepared for either engagement or disengagement, and c) during the first and the second shifts at least one fourth shift element is kept engaged or nearly engaged.

Abstract: A method for operating a motor vehicle drivetrain with at least an automatic transmission and a drive motor. The automatic transmission includes at least five shifting elements to transmit torque and/or power. In each forward and reverse gear a maximum of two shifting elements are disengaged while the remaining shifting elements are engaged. Two consecutive gearshifts are carried out through selection of the five shifting elements. During a first gearshift, implemented as a multiple gearshift, a subsequent second gearshift, implemented as either a single or multiple gearshift, is prepared. During the first gearshift, a first shifting element is disengaged, a second shifting element is engaged, a third shifting element is prepared for disengagement in a subsequent second gearshift and a fourth shifting element is prepared for engagement. Further, during the first gearshift and the subsequent second gearshift, a fifth shifting element is retained in at least a substantially engaged state.

Abstract: A method for operating a motor vehicle drivetrain with at least an automatic transmission and a drive motor. The automatic transmission includes at least five shift elements to transmit torque and/or power. In each of the forward and reverse gears, at least three shift elements are engaged and the remaining shift elements are disengaged. Two consecutive gearshifts are carried out through selection of the five shift elements. During a first gearshift, implemented as a multiple gearshift, a subsequent second gearshift, implemented as either a single or multiple gearshift, is prepared. During the first gearshift, a first shift element is disengaged, a second shift element is engaged, a third shift element is prepared for disengagement in a subsequent second gearshift and a fourth shift element is prepared for engagement. Further, during the first gearshift and the subsequent second gearshift, a fifth shift element is retained in at least a substantially engaged state.