A shift control method for dual-clutch transmission avoiding dual-clutch shift power cycle

A dual-clutch transmission and dual-clutch technology, applied in the direction of clutches, transmission control, and components with teeth, etc., can solve the problems of damage to shifting clutch parts, decreased smoothness of shifting, and large clutch wear, etc., to achieve reduction Effects of shifting shock, improving shifting performance, and prolonging service life

Active Publication Date: 2018-07-03
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The special structural characteristics of DCT reduce the power loss when shifting gears, but due to the existence of power cycle, the longer the clutch shifting time, the smaller the impact, but the greater the wear of the clutch, on the contrary, the shorter the clutch shifting time, which is beneficial to improve The wear condition of the clutch, the greater the impact, the worse the smoothness of shifting, so the shifting time and shifting impact in the presence of power cycles become a pair of contradictions that are difficult to reconcile during power transfer
Therefore, power circulation phenomenon is easy to occur during DCT shifting process, resulting in power loss, reduced smoothness of shifting and damage to shifting clutch components

Method used

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  • A shift control method for dual-clutch transmission avoiding dual-clutch shift power cycle
  • A shift control method for dual-clutch transmission avoiding dual-clutch shift power cycle
  • A shift control method for dual-clutch transmission avoiding dual-clutch shift power cycle

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Embodiment

[0055] Embodiment: This embodiment uses the control method of the present invention to carry out shift control to a certain type of 7-speed dual-clutch automatic transmission, and the specific control process is as follows:

[0056] figure 1 It is a simplified structural diagram of a 7-speed dual-clutch transmission of a certain model, with the first and second gears selected for shift control, and the other gears are not shown in detail. figure 1 C1 and C2 represent clutch 1 and clutch 2 respectively. In the process of shifting from first gear to second gear, clutch 1 is a disengaging clutch, and clutch 2 is an engaging clutch; G1~G7 represent gears at all levels, and specify the transmission ratio i ab is the transmission ratio between gears Ga and Gb (a=1~7; b=1~7), then the first gear transmission ratio i 1 for i 12 × i 37 , second gear ratio i 2 for i 45 × i 67 .

[0057] Assume that the initial state of the dual-clutch transmission is that the clutch C1 is engaged...

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PUM

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Abstract

The invention discloses a dual clutch transmission gear shifting control method for preventing dual clutch gear shifting power circulation. The method is characterized in that when a dual clutch transmission carries out gear shifting, by means of disengagement and engagement control of a dual clutch and rotating speed adjustment of an engine, the dual clutch is prevented from generating gear shifting power circulation, and gear shifting power consumption of the dual clutch is reduced; and meanwhile, gear shifting impacting is reduced, and the gear shifting smoothness of the dual clutch transmission is improved.

Description

technical field [0001] The invention relates to a method for controlling automatic gear shifting of a vehicle, in particular to a method for controlling gear shifting of a dual-clutch transmission that avoids power cycles of dual-clutch gear shifting. Background technique [0002] Dual Clutch Transmission (DCT) is a new type of automatic transmission developed on the basis of manual transmission. It uses two clutches for power transmission. When the first clutch transmits the current gear, the second clutch transmits power. The first clutch can be used to preset the shift-in gear. When the switch between the current gear and the shift-in gear needs to be completed, the first clutch releases the current gear, and the second clutch engages the shift-in gear at the same time. DCT not only has the flexibility of a manual transmission, but also has the comfort of an automatic transmission. There is no obvious power interruption during the entire shifting process, and at the same ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/04F16H63/50F16D48/06
CPCF16D48/06F16D2500/502F16D2500/70406F16D2500/70454F16H61/04F16H63/50Y02T10/60
Inventor 夏光郭东云常佳男郑友谢海闫瑞琦滑杨莹杜克邹斌施信信
Owner HEFEI UNIV OF TECH
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