Method for protecting against overloading of a synchronizing device

Abstract

The invention relates to a method for protecting against overloading of a synchronizing device of an automatic transmission of a motor vehicle, in particular an automatic shift transmission, preferably a dual clutch transmission, wherein the transmission has at least one clutch, at least one first shaft and a second a shaft, at least two gear positions, preferably a plurality of gear positions, atleast one gear position adjuster for effective engagement or withdrawal of the respective gear position, preferably a plurality of gear position adjusters, and at least two synchronizing devices. Atleast one controller is provided for effecting gear shifting of the transmission and/or for controlling the clutch and/or for controlling the synchronizing devices and/or the gear position adjuster. The overload of the synchronizing devices of the target gear position is prevented by determining the rotational speed of the first shaft and determining the rotational speed difference between the first shaft and the synchronous rotational speed corresponding to the target gear position, wherein only when the rotational speed difference determined in terms of the numerical value reaches or is lower than a predetermined rotational speed difference threshold, the synchronizing device of the target gear is operated.

Description

technical field [0001] The invention relates to a method according to the features of the preamble of patent claim 1 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 ...

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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