毕业设计外文翻译---自动变速器换挡规律的研究.doc

毕业论文(设计)外文翻译 机械工程学院机械制造及其自动化专业(本科)2008级机制二班 课题名称：某变速箱上盖零件大批生产的 工艺工装设计 毕业论文(设计)起止时间： 2012年 03月05日～05月25日(共12周) 学生姓名： 学号：2008111204 指导教师： 报告日期： 2012.03.17 the researchs of amt shifting schedules Vehicular Automatic Transmission can be divided into three types: Automatic Transmission (AT), Automated Mechanical Transmission (AMT) and Continuously Variable Transmission (CVT). AMT has become a kind of transmission that is full of potentiality, due to its high transfer efficiency, low cost and easiness to manufacture. The research on AMT shifting performance is key technology in the developing. Shifting performance directly influence the market competition and industrialization of AMT. AMT has good market expectation, but during the shifting procedure, the power must be cut off which causes the poor shifting performance than AT and CVT. Only through improving the shifting performance can the commercial competence be established. So the virtual important thing is to find the way to improve shifting performance. The development of AMT can be divided into three phases: semi-automatic, automatic and intelligent. The two major part of AMT are: the hardware including the mastered object, executor, sensors and TCU; and the software performing the control strategy. The performance of AT shift influences greatly the performance of the vehicle. So the research on at shift quality is an important problem in the domain of AT researching. Shift quality control of AT is accomplished by electronic and hydraulic system. To shift smoothly, according the real time throttle valve opening and vehicle speed signal, the controller sends electronic signals to control oil pressure changing curve of the applying elements. this paper analyzes and research detailed shift quality control system，the analyzing model of shifting process and pressure changing curve of the applying elements Firstly this paper summarizes the existing evaluated quota of shift qu