Abstract: The invention relates to a method for early recognition of abnormal occurrences in the operation of automatic or automated gearboxes wherein at least one variable Akraftschl directly or indirectly characterizing the strain on elements which are to be coupled to each other in a non-positive fit is continuously determined after an n-th shift at least until a synchronous rev speed is reached or during a maximum shift period Tmax; wherein the variable Akraftschlüssig characterizing the strain on the elements that are to be coupled is mathematically combined with the time, or if several variables Akraftschlüssig Exist, said variables are mathematically combined with each other and the product of said combination is added up in the form of a variable Wsum; wherein the product thereof is compared with a first pre-definable or defined threshold value Wmax0 Which, if exceeded, defines a state from which damage can be deduced and the shift action is aborted.

Abstract: The invention relates to a method for early recognition of abnormal occurrences in the operation of automatic or automated gearboxes wherein at least one variable Akraftschl. directly or indirectly characterizing the strain on elements which are to be coupled to each other in a non-positive fit is continuously determined after an n-th shift at least until a synchronous rev speed is reached or during a maximum shift period Tmax; wherein the variable Akraftschlüssig characterizing the strain on the elements that are to be coupled is mathematically combined with the time, or if several variables Akraftschlüssig Exist, said variables are mathematically combined with each other and the product of said combination is added up in the form of a variable Wsum; wherein the product thereof is compared with a first pre-definable or defined threshold value Wmax0 Which, if exceeded, defines a state from which damage can be deduced and the shift action is aborted.

Abstract: A process for the control of switching or shifting processes in automatic gears with an allocatable control device for use in drivelines of vehicles with at least one drive motor, especially in the form of an internal combustion engine. In a first process step the actual values of certain travel-dynamics magnitudes for a given time point to are detected or calculated; in a second process step there is determined from the actual values a theoretically achievable connection speed of the drive motor, especially the internal combustion engine, in the actually shifted-in gear for each time step; in a third process step the ascertained connection speed is compared with limit speeds that can be stipulated in a characteristic field of the drive motor, in which in dependence on the comparison results in no switching process, or an upshift- or downshift- switching process is initiated by governing of the setting members actuatable for the carrying-out of a gear change.

Abstract: The invention relates to a process for the control of the shifting process of a vehicle with electro-hydraulically actuatable friction elements for the shifting-over between different transmission stages in a vehicle with at least in addition a drive engine in which a current actual value is determined for at least one magnitude characterizing the shift process in each shifting process; the actual value is compared with an establishable and/or storable desired value; on deviation of the actual value from the desired value, the control pressure for the at least indirect influencing of the magnitude characterizing the switching process is adaptively changed by a determinable, calculatable or prescribable first correction value for the achieving of an optimal shifting behavior and the course of the altered magnitude is storable in each case as new characteristic curve of the desired values.

Abstract: A process is provided for operating a vehicle transmission with preferably electrohydraulically actuatable friction elements for shifting between different transmission steps, in a vehicle with at least one drive engine in which an actual value of at least one of the quantities characterizing the shift process is determined for each shift process, which actual value is compared with a theoretical value that can be established and stored. When the actual value deviates from the theoretical value, a regulated quantity for at least direct influencing is changed by a correction value that can be established. For each shift process, the time duration for the output of a gear shift signal up to the beginning of the synchronization process and/or the change of the drive rpm during this time period is determined as a first and/or second actual value of the quantity characterizing the process.

Abstract: A method for the control of shifting processes in a vehicle transmission from an initial gear to the next higher target gear includes the steps of continuously determining the vehicle acceleration (a) and the driven rpm (n.sub.2) behind the vehicle transmission. A shifting process is triggered when the acceleration value (a) and the essentially simultaneously recorded driven rpm value (n.sub.2) fall on a shifting point which lies on a shifting characteristic (n.sub.2 (a)) in an acceleration-driven rpm diagram, where the shifting characteristic (n.sub.2 (a)) has a stepped course with at least two break points (a.sub.-- max; a.sub.-- min) and the slope of the shifting characteristic for acceleration values a.sub.-- min<a<a.sub.-- max is always smaller than or equal to the slope of the shifting characteristic for acceleration values a.ltoreq.a.sub.-- min or a.gtoreq.a.sub.-- max. In other words, the following applies:.linevert split.n.sub.2 (a.sub.1).linevert split..ltoreq..linevert split.n.sub.2 (a.sub.

Abstract: The invention concerns a method for operation of a drive unit of a vehicle, including a drive machine and a transmission with at least two gears. A quantity that characterizes acceleration of the vehicle and a quantity that characterizes the power of the drive engine are continuously determined. A gear shift speed range and a second speed range bounded by a lowest and highest attainable speed in the target gear can be established for a gear shift process in the initial gear. The gear shift speed range is bounded at least by a lower gear shift speed and an upper gear shift speed and the second speed range is bounded by a lower target speed, as well as an additional speed. The gear shift process is initiated as a function of the determined acceleration. The lower target speed is achieved in a gear shift process in a first limiting stage (high acceleration at low input speeds or limited deceleration at low input speeds) during initiation of a gear shift at a number of gear shift speeds.

Abstract: A releasable coupling between a shaft and a hub is provided, which coupling includes a device operable by a pressure medium to produce a pressure lack between the shaft and the hub.

Abstract: The disclosure concerns a universal joint shaft having two coupling forks joined at a journal cross. Various embodiments of aligning apparatus selectively restrict the journal forks to adjust the angle of bend with respect to each other. In one embodiment, a tube radially outside the coupling forks and journal cross is supported on one fork and is driven by a pressure cylinder against the other fork to restrict the bending of the forks with respect to each other at the journal cross. In other embodiments, one or more piston/cylinder units are provided on one of the forks, with the piston being movable against a bearing point on the other fork for restricting the extent to which the other forks may bend. Pressure medium is delivered to the pistons through a pressure medium line controlled by a pressure maintaining valve which is shiftable for permitting pressure medium to pass to the piston/cylinder unit or to stop passing thereto.