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Method for identifying worn synchronization units

A technology of synchronous units and sliding sleeves, applied to components with teeth, belts/chains/gears, mechanical equipment, etc., can solve problems such as scratching noise, damage to transmission mechanical devices, and failure to achieve synchronous operation

Active Publication Date: 2017-06-13
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since synchronous operation has not yet been achieved, the slip sleeve hits the floating wheel (i.e. the switching wheel) at a differential speed and the sliding sleeve will face away from the mating teeth of the floating wheel
This causes a scratching sound and can damage parts of the transmission mechanism
[0006] Transmission mechanics can become damaged during repeated attempts to engage a gear with worn or faulty synchronization

Method used

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  • Method for identifying worn synchronization units

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Embodiment Construction

[0023] figure 1 An embodiment of the method sequence of the invention is schematically shown. In order to detect a faulty synchronizing unit, the differential speed must first be ascertained with respect to the transmission input speed. The differential rotational speed is defined as the target rotational speed minus the actual rotational speed. The target rotational speed is the rotational speed resulting from the product of the output shaft rotational speed and the transmission ratio of the gear to be synchronized. The actual speed corresponds to the measured input shaft speed. The validity of the ascertained rotational speed information can be determined by means of a plausibility check of the detectable sensor system and / or of the measured values ​​(maximum value, gradient plausibility, etc.).

[0024] In the case of valid rotational speed information, the end of the synchronization phase can be detected via the differential rotational speed. If the differential rotati...

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Abstract

The method involves moving a sliding sleeve from a predetermined synchronous starting position towards a ratchet wheel by a transmission actuator during a gear shift operation. Differential rotational speed of the sleeve is determined during axial movement of the sleeve, where the differential speed is difference between target-rotational speed and actual rotational speed. The axial movement of the sleeve is completed when a predetermined synchronous end criterion is fulfilled such that a transmission mechanism is protected through the completion of the axial movement.

Description

technical field [0001] The invention relates to a method for detecting wear and / or faults of a synchronizing unit in an automatic transmission of a motor vehicle. Background technique [0002] The scope of application of the invention is automatic transmission systems, in particular automatic shift transmissions and dual clutch transmissions. [0003] A method for detecting damage in a shift actuator of an automatic transmission is disclosed in WO 2006 / 053512 A1. For this purpose, in particular the actual duration actually required for the synchronization of the gears is ascertained and compared with the setpoint duration. [0004] However, there is no possibility for detecting wear or failure of the synchronizing unit in the automatic transmission system. [0005] Worn or faulty synchronizing units may be caused by insufficient synchronization between synchronizing ring and deflection wheel, ie insufficient synchronous movement between synchronizing ring and deflection wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/12F16H61/68
CPCF16H61/12F16H2059/462F16H2059/6807F16H2061/1224F16H2061/1276
Inventor B·施特勒P·斯坦吉尔
Owner SCHAEFFLER TECH AG & CO KG