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Research on Start and Shift Character of Dual Clutch Transmission

Author: ZouHui
Tutor: ZhouYunShan
School: Hunan University
Course: Vehicle Engineering
Keywords: Dual-clutch automatic transmission Wet clutch Launch Control Shift control Simulation Analysis
CLC: U463.212
Type: Master's thesis
Year: 2010
Downloads: 347
Quote: 6
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Abstract

With the continuous development of the automotive automatic transmission technology, countries in research and development of the nationally appropriate vehicle automatic transmission. Dual-clutch automatic transmission (Dual Clutch Transmission, referred to as DCT) is developed on the basis of the manual transmission, a new automatic transmission, both maintained electronically controlled automatic mechanical transmission (Automated Mechanical Transmission, referred to as AMT) simple structure, transmission and high efficiency, but also to overcome the shortcomings of the AMT shift when the power interruption, the transmission ratio can be achieved in the case of not cut off the power conversion, thus shortening the shift time, effectively improve shift quality. Dual-clutch automatic transmission combines the advantages of MT, AMT, AT transmission, the vehicle performance has been greatly improved, and therefore subject to a lot of manual transmission based national attention. In this thesis, a 6-speed wet dual-clutch automatic transmission as the research object, the generation and application prospects of dual-clutch automatic transmission introduced on the structural characteristics of the dual-clutch automatic transmission, the working principle and its composition and function were analyzed. Dual-clutch automatic transmission with two clutch input shaft links two adjacent files passive gear staggered with two input shaft gear meshing with two clutch control can be achieved in the process of shifting through the clutch is switched alternately shift process without power interruption, so as to achieve the purpose of power start-up and shift, effectively improve the start-up and shift quality. Wet, dry double clutch performance, as well as two wet dual-clutch structure type were compared to establish the dynamic model of a wet multi-plate clutch engagement process. The engine is the source of automotive power, and thus the engine model is the basis of simulation of automotive driveline therefore established for vehicle system simulation engine model. Determine the operating mode of the dual-clutch automatic transmission, according to the type of work status of the clutch on the basis of the analysis in the start of the dual-clutch automatic transmission and the shifting process, the establishment of a dual-clutch automatic transmission start and a shift dynamics model. Eight degrees of freedom vehicle model and the impact of the clutch engagement process and the friction work were analyzed according to the actual research needs. The clutch started to react quickly to adapt to the changes in vehicle load and external slope, and can reduce the wear rate of the clutch, so the clutch Launch Control is a difficult problem. In this paper, on the basis of the establishment of the dynamic model of the dual-clutch automatic transmission system started, start the process of clutch engagement regular use of I, II file at the same time involved in the initial process, and fuzzy control two different starting conditions and the driver's intention clutch, the degree of bonding and the start of the car started gear control strategy using Matlab / Simulink software to start the process of the dual-clutch automatic transmission system modeling and simulation analysis, the results of the electronically controlled mechanical automatic transmission AMT clutch started were compared. The results showed that the design started fuzzy control strategy can effectively improve the quality of the dual-clutch automatic transmission vehicles starting. In the analysis of the process of overlapping dual-clutch automatic transmission shift characteristics and lift files dual-clutch control strategy based on two parameters shift control law during a shift dual-clutch automatic transmission system modeling and simulation, simulation results show that The shift control strategy can be achieved quickly and accurately both clutch disengagement, and to ensure smooth and fast dual-clutch automatic transmission car shift. Dual-clutch automatic transmission with high transmission efficiency, the installation space is compact, light weight, and many other advantages, and it is achieved through a simple parallel shaft transmission structure the process of power shift, both to improve vehicle performance, but also reduce the cost of production, especially for promote universal in our country, will occupy an important position in the field of automatic transmission.

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CLC: > Transportation > Road transport > Automotive Engineering > Automotive structural components > Transmission > Mechanical transmission > Transmission
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