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Method for controlling a dual clutch transmission

A dual-clutch transmission technology, applied in transmission control, geared elements, belts/chains/gears, etc., can solve the problems of reducing efficiency and energy loss of dual-clutch transmissions

Active Publication Date: 2020-09-08
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This mode of operation can generate a drag torque, especially in friction clutches designed as wet clutches, and this mode of operation can lead to energy losses due to reduced efficiency of the dual clutch transmission

Method used

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  • Method for controlling a dual clutch transmission
  • Method for controlling a dual clutch transmission
  • Method for controlling a dual clutch transmission

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] Figure 1 to Figure 3 Curves showing different shifting sequences for overlapping shifting of a dual clutch transmission with two subtransmissions figure 1 , 2, 3, wherein, I gear, III gear is arranged on the first sub-transmission and II gear is arranged on the second sub-transmission. At the beginning of the shift, gear I is engaged and gear II is scheduled to be engaged.

[0020] figure 1 shows the curve with subplot a figure 1 , subgraph a shows the curve M of the torque of the internal combustion engine as a function of time M (t), the curve M of the torque of the first friction clutch of the first sub-speed changer as a function of time K1 (t) and the curve M of the torque of the second friction clutch of the second sub-transmission as a function of time K2 (t). Subgraph b shows the curve n of the rotational speed of the internal combustion engine or the input part of the friction clutch as a function of time M (t), the curve n of the speed change with ti...

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PUM

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Abstract

The invention relates to a method for controlling a dual clutch transmission having two subtransmissions each having a plurality of shiftable gears (I, II, III) and an arrangement of an internal combustion engine and a dual clutch transmission Dual clutches between the two clutches have two friction clutches, in particular wet clutches, wherein an automatically operable friction clutch is arranged between each sub-transmission and the crankshaft and shifts between the sub-transmissions by overlapping shifts During the overlap shift, the engaged friction clutch and the disengaged friction clutch are disengaged and engaged in a crosswise manner when the respective gears (I, II) are engaged in the partial transmission, and during the overlap shift Afterwards, the engaged gear (I) of the partial transmission with the disengaged friction clutch is disengaged and the next gear (III) corresponding to the driving situation is engaged before a new overlapping shift. In order to improve the energy balance of DCT, according to the drag torque (M s (t)) Engage the next gear (III) of the partial transmission with the disengaged friction clutch.

Description

technical field [0001] The invention relates to a method for controlling a dual-clutch transmission having two sub-transmissions each having a plurality of shiftable gears and a dual clutch arranged between an internal combustion engine and a dual-clutch transmission, the dual-clutch There are two friction clutches, in particular wet clutches, wherein an automatically operable friction clutch is arranged between each sub-transmission and the crankshaft and the shifting process between the sub-transmissions is carried out by means of overlapping shifts in which Disconnecting and engaging the engaged friction clutch and the disengaged friction clutch in a crosswise manner with each engaged gear in the sub-transmission, and disengaging the sub-transmission with the disengaged friction clutch after the overlapping shift According to the driving situation, engage the next gear before the new overlap shift. Background technique [0002] Dual-clutch transmissions (known for exampl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/688F16H59/14
CPCF16H59/14F16H61/688F16H2306/18
Inventor 尤尔根·本茨魏云帆皮埃尔·米莉莎乐马库斯·贝尔
Owner SCHAEFFLER TECH AG & CO KG