| Automated Mechanical Transmission (AMT) designed on the ground of Manual Transmission and dry clutch, is able to realize automotive starting and shifting of the vehicle by electro-hydraulic actuator which is controlled by Transmission Control Unit(TCU). Automated Mechanical Transmission (AMT) takes an important role in the family of Automatic Transmission, due to its high transferring efficiency, low cost and easiness to manufacture. The system has been a topic of general interest to be developed because of its excellence properties and the demands of improving vehicle oil efficiency and decreasing vehicle exhausted gas in the world. Series of the products have been found on some types of vehicles in the world in last few years. The market of AMT becomes larger and larger.AMT is suitable to our Chinese situation, at the same time it has a large market and developing foreground. In China, the development and research of AMT is mainly carried out by the Hydraulic Mechanical Transmission Institute (HMTI), Jilin University. In August,1998, Santana 2000 with AMT developed by HMTI passed the national appraisal. The experts concluded that this research was advanced internationally. This symbolized that AMT has been fully developed into the merchandising stage. Now, some vehicle corporations are developing the AMT technology in our country, the technology isn't very mature and they aren't able to provide a real product. but we believe they can provide product in few years in future. This paper is carried out combining the project"The research on technology of Automated Mechanical Transmission on JIEFANG truck" of Technology Center of First Automobile Corporation of china. The research is first carried out on truck in China. With the research of technology about AMT, the paper's main investigative contents include several questions which shall be analyzed followed.1,Firstly, In chapter one, the development process and the current status internationally of AMT are introduced briefly. AMT is an important technology in the controlling field of vehicle. Secondly, the general structure of AMT is introduced briefly and the merits and shortcomings of the automatic gearbox are analyzed in general. At last, The main investigative contents are confirmed .2,The research on power train properties. The work of obtaining the stable property of diesel engine by experiment, and analyzing the dynamic property of engine are the bases of the design of engine controlling system; The clutch's breakaway and engagement properties obtained by experiment, and the torque transfer property which can be calculated by using the experiment results are the bases of the building of clutch controlling regulations; the manipulating force and distance of the transmission are acquired by experiments, The results provide some basic parameters to actuator's design. In conclusion, the part provide the power train properties systematically with respect to AMT system, The work not only provide the foundation of controlling research the power train but also guarantee the controlling properties of power train and the vehicle.3,The research on clutch control strategies. The most difficult issue is cutch controlling in the AMT system and the clutch controlling technology is the key technology of realizing the automatic gearbox. Firstly, the vehicle dynamic principles of clutch engagement process are deeply analyzed, Then the evaluating indicators of the clutch performance which are the friction work and the jerk are discussed; Clutch engagement process and the influence to the evaluating indicators of the process has been analyzed systematically in order to obtain high performance, Then ideal clutch engagement controlling strategies are established. Secondly, the way to realize the clutch engagement controlling strategies is discussed, The proper controlling logic for clutch precise control is selected, the simulation of clutch actuator motion has been done. Computer programs of clutch control are edited according to the analysis. Finally,...
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