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Shift control method in an automated manual transmission

A shifting transmission, shifting control technology, applied in transmission control, components with teeth, belts/chains/gears, etc., can solve the problem of slowing down the process of shifting gears, low braking torque, and time target gears Synchronous slow down and other issues, to avoid the effect of acceleration

Inactive Publication Date: 2011-04-13
ZF FRIEDRICHSHAFEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this requirement cannot be met only with a transmission brake whose braking torque M Br Speed ​​difference Δn to be reduced at the gear coupling GK is constant in the interval
Therefore, at a higher braking torque M Br The transmission brake at a specific speed difference Δn GK is no longer available below; or the transmission brake has such a low braking torque M Br , so that the synchronization of the target gear is considerably slowed down in terms of time and thus the entire gear change process

Method used

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  • Shift control method in an automated manual transmission
  • Shift control method in an automated manual transmission

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Embodiment Construction

[0024] exist figure 1 In the diagram of , the characteristic operating parameters of a drive train comprising an automated shift transmission provided with asynchronous gear couplings are described over time for the process according to the invention for shifting gears, the The input shaft of the shift transmission is connected via an automatically controllable disconnect clutch to the propeller shaft driving the engine, and the shift transmission has a drive brake which is drivingly connected to the input shaft. The input shaft speed curve n of the gearshift transmission is shown in subdiagram a) GE and drive shaft speed curve n of the driving engine M , in subdiagram b) the torque curve M of the transmission brake is shown Br , and in subdiagram c) the transmittable torque M of the disconnecting clutch is shown K torque curve.

[0025] At the beginning of the upshift process, starting from time t1, the load on the drive engine is reduced approximately simultaneously and ...

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Abstract

The invention relates to a shift control method in an automated manual transmission which is located in a drive train of a motor vehicle between a drive motor and a final drive, is provided with unsynchronised gear couplings and the input shaft of which can be connected to the drive shaft of the drive motor by means of an automatically controllable cut-out clutch. During an upshift, the target gear is synchronised when the cut-out clutch is open by the setting of a predominantly constant braking torque (MBr) in a transmission brake that has a drive connection to the input shaft. To permit an acceleration of the gear-shift process without complicating the construction, as the input speed (nGKE) approaches the output speed (nGKA) the gear coupling of the target gear is partially closed to end the synchronisation of the cut-out clutch and is reopened at approximately the same time as the transmission brake is released.

Description

technical field [0001] The invention relates to a method for the automatic shift control of a shift transmission arranged between a drive engine and an axle drive in a motor vehicle drive train, the shift transmission being provided with asynchronous gear couplings (Gangkupplung), and the input shaft of the gearshift transmission can be connected to the drive shaft of the driving engine through an automatically controllable disconnect clutch, wherein, when shifting gears, the disconnect clutch is opened by adjusting the connection with the input shaft The synchronizing of the target gear is achieved primarily by a constant braking torque at the transmission brake of the transmission connection. Background technique [0002] In a gearshift transmission, when switching between the load gear (Lastgang) and the target gear, the load gear on the gear coupling inside the transmission that is assigned to the target gear and is also disengaged After disengagement, a speed differenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/04F16H61/682
CPCF16H61/0403F16H2061/0411F16H2306/48
Inventor 伯恩特·多贝勒诺伯特·维恩切克
Owner ZF FRIEDRICHSHAFEN AG