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Study on Hydraulic Shift Actuator of Automatic Mechanical Transmission

Author: ChenLiJun
Tutor: SunDongYe
School: Chongqing University
Course: Vehicle Engineering
Keywords: Shift Mechanism Shifting Rules Shift resistance Hydraulic system Parameter design Dynamic Simulation
CLC: U463.212
Type: Master's thesis
Year: 2011
Downloads: 119
Quote: 1
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Abstract


Automatic transmission technology is one of the important research direction of the vehicle to improve and perfect the drive system. The electronically controlled automatic mechanical transmission (Automatic Mechanical Transmission, AMT) not only has a hydraulic automatic transmission (AT) manipulation of the advantages of convenience, but also retains the original manual transmission (MT) a gear high efficiency, simple structure, low cost, transmission development in China has become the main direction. In the design and development of the AMT, the the shifting actuator design and optimization has been the focus and difficult one, and its performance directly affects the performance of the AMT system. Shifting actuator inaccurate shift action agencies poor reliability, not mass loading problem. In this paper, a car loaded with manual transmission, an electronic control - hydraulic shifting actuator design, analysis and research mainly from the following aspects: (1) summarizes the development of domestic and foreign automatic transmission control system history and the current research, the basic components of the AMT system works, and the the AMT key technical issues and the operating system structure. The ② introduced AMT shift the basic process and the synchronization works, Stress Analysis of the shifting process. Two parameters to work out the best power and economy shifting laws and ECE EUDC based in Europe, Japan, 10-15, the United States FTP75 cycle driving conditions require vehicle simulation model based on the structural parameters of the prototype vehicle and engine performance parameters. Verified by simulation shift regular reasonableness, and to find the maximum synchronous force, and then estimate the maximum shift resistance. ③ maximum shift resistance, load shift hydraulic cylinder, draw its maximum load. And then based on the maximum load shifting hydraulic cylinder structural parameters of the design and selection of hydraulic components. The ④ analysis fork shaft hydraulic drive circuit to establish the mathematical model of the hydraulic system. Selected widely PID control as the model control algorithm in Matlab / simulink environment to build a digital simulation model of the hydraulic system. (5) the process of shifting the dynamic response curve simulation draw Shift Mechanism simultaneous analysis of the impact of the changes in the different parameters of the system dynamics. Through the analysis of simulation results, we can verify the correctness of the model and control strategy, and also verifies the feasibility of the design approach.

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