Method for controlling a dual clutch transmission

A dual-clutch, transmission technology, applied in transmission control, toothed components, belts/chains/gears, etc., can solve transmission loss and other problems, and achieve the effect of saving consumption and reducing emissions

Inactive Publication Date: 2015-01-21
ZF FRIEDRICHSHAFEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, problems due to a possibly wrong gear selection are to be avoided, for example when the next higher gear has already been preselected, but the driver embarks on an overtaking procedure and wishes to perform a downshift in order to obtain the greatest possible shift. Traction reserve, but the following situation occurs, that is annoyingly caused by the driver in the unloaded sub-transmission of the gear shift outside the repeated shift process, or in particular through the drag torque in the embodiment of the wet clutch Transmission losses on an open dual clutch due to the speed difference between input and output

Method used

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  • Method for controlling a dual clutch transmission

Examples

Experimental program
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Embodiment Construction

[0024] A dual-clutch transmission of a motor vehicle (not shown but known from the prior art described above) has two sub-transmissions, wherein in driving operation only one of the two sub-transmissions is active, so , is drive-connected to the drive motor via the associated first clutch, while the other sub-transmission is inactive, ie is decoupled from the drive motor via the associated second clutch and is therefore unloaded.

[0025] The drawing shows a flow chart of function blocks F1 to F11 with method steps for determining whether a target gear should be preselected in the currently unloaded sub-transmission of the dual clutch transmission.

[0026] The method therefore uses the currently engaged gear according to function block F1 as a starting point. In function block F2 , a possible target or follower gear of the current gear is determined, which in principle can be preselected or engaged in the currently unloaded sub-transmission.

[0027] The knowledge of the fol...

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Abstract

The invention relates to a method for controlling a dual clutch transmission that has two partial transmissions which are each connected to a clutch on the input side, via which a drive connection can be established to a drive motor, wherein a target gear following a currently active gear can be pre-selected in a particular load-free partial transmission of the two partial transmissions. The following steps are performed: determining a potential target gear, - measuring a total loss of the transmission with the aid of measurements and / or model calculations and / or variables derived therefrom, - in the first case in which the target gear is pre-selected and - in the second case in which no gear is selected, - ascertaining whether the total loss is greater or lesser when the target gear is pre-selected or when no gear is selected, - deciding whether or not a target gear should be pre-selected with the aid of the measured total loss as a criterion, and - implementing measures according to the decision that is made.

Description

technical field [0001] The invention relates to a method for controlling a dual clutch transmission according to the preamble of claim 1 . Background technique [0002] Dual-clutch transmissions are known in various constructions with functionally independent sub-transmissions which are each connected to an input-side clutch, via which a drive connection to the drive motor can be established. Typically, two subtransmissions in the form of countershafts are provided, which can be constructed axially one behind the other, axially parallel or interleaved with one another. In the sub-transmission, the gear groups are respectively arranged in several gear-set planes of the gears passing there, wherein usually the even-numbered gear groups can be shifted in one of the two sub-transmissions and the odd-numbered gear groups can be shifted in one of the two sub-transmissions. The other of the two sub-transmissions shifts gears. Both clutches can be arranged in a common clutch housi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/688F16H61/02
CPCF16H2061/0216F16H2061/0015F16H2306/18F16H2306/50F16H2061/0232F16H61/688F16H61/0213
Inventor 托尔斯滕·莱姆卡罗琳·黑勒
Owner ZF FRIEDRICHSHAFEN AG
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