Method for protection against overloading of a synchronization device

Abstract

The invention relates to a method for protecting against overloading of a synchronization device of an automatic transmission, in particular an automatic shift transmission, preferably a dual clutch transmission, of a motor vehicle, wherein the transmission has at least one clutch, at least one first shaft and a second Shaft, at least two gears, preferably a plurality of gears, at least one gear adjuster, preferably a plurality of gear adjusters, and at least two synchronizers for active engagement or disengagement of the respective gears , and wherein at least one controller is provided for realizing a gear change of the transmission and / or for controlling a clutch and / or for controlling a synchronizer and / or a gear adjuster. Overloading of the synchronizing device of the target gear is prevented by determining the rotational speed of the first shaft, determining the rotational speed difference of the first shaft with the synchronous rotational speed corresponding to the target gear, wherein when the numerically determined rotational speed difference The synchronization of the target gear is only actuated when a predetermined rotational speed difference threshold is reached or falls below.

Description

technical field [0001] The invention relates to a method for protection against overloading of an automatic transmission of a motor vehicle, in particular a synchronizer of an automatic transmission. Background technique [0002] Various synchronizing devices for automatic transmissions of motor vehicles, in particular automatic shift transmissions, are already known in the prior art. First of all, all transmissions of a motor vehicle in which gear changes are automatically and / or automatically executed and / or controlled fall under the term automatic transmission. This includes, for example, automatic transmissions or, in particular, likewise dual-clutch transmissions. [0003] Generally, it is common for all synchronizing devices of automatic transmissions of motor vehicles that they have at least one outer and one inner synchronizing ring (Synchroning ring), which have substantially mutually pointing, concentric extensions friction surface. In principle, the correspondi...

AI Technical Summary

Problems solved by technology

In the case of the methods known in the prior art, the actuation of the synchronization device is prevented when damage is achieved or an excessively high load is present during the actuation

This may then lead to failure of the corresponding synchronizer, possibly likewise of the variator

In the end effect, this can therefore lead to significant repair costs and / or to failure times of the motor vehicle (Ausfallzeit)

As a result, the methods known in the prior art for protection against overloading of synchronization devices have therefore not been optimally constructed

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