【作者】 龚群英；

【导师】 秦大同；

【作者基本信息】 重庆大学 ， 机械设计及理论， 2007， 硕士

【摘要】 电控机械式自动变速器(AMT)是在传统的固定轴式变速器和干式离合器的基础上,通过增加电控单元(ECU)、传感器以及相应的执行机构实现自动变速的。由于它具有传动效率高、成本低和易制造等优点,从上世纪70年代中期起,就成为自动变速器发展的一个重要方向。随着电子技术和现代控制理论在自动变速器系统中的应用,AMT技术得到了不断发展和完善,性能也有很大提高。特别是上世纪90年代中期,车载网络在车辆上的普及应用更提高了AMT系统的控制性能、减少了传感器数量和线束,为AMT的商业应用打好了基础。课题结合重庆市科技攻关项目《重型车辆机械自动变速传动系统研制及产品开发》以及“863”计划资助项目《重型商用车机械自动变速器(AMT)开发》,按照重型车辆对现代AMT电控系统的要求,基于SAE J1939 CAN通信协议,把AMT电控系统作为车载CAN通信网络的一个智能节点,采用数字信号处理芯片TMS320LF2407A设计开发了AMT电控系统。本研究以构建与实现网络化AMT电控系统为目标,以电控发动机(EDC7UC31)和法士特变速器为研究对象,制定了相关的离合器接合与选换档控制策略,并开发了相应模块的控制程序,具体做了如下几项工作:(1)通过对国内外AMT发展现状及发展趋势进行分析,提出智能化和网络化控制是AMT的发展方向;指出在AMT系统中,发动机、离合器和变速器之间存在相互关联、相互影响的关系,需要各子控制系统的相互协调配合;分析了现代AMT系统的组成部分和构建网络化AMT电控系统的基本要素。(2)分析了CAN总线网络的特点、J1939协议内容以及EDC7UC31电控发动机的PGN定义,制定了基于SAE J1939协议的网络化AMT智能节点PDU编码,为实现网络化AMT控制系统提供了网络控制协议标准。(3)对AMT中离合器、变速器的控制进行了研究,制定相关的离合器接合与选换档控制策略,讨论了离合器模糊控制和最佳动力三参数换档规律在DSP系统中的实现过程,为系统设计和实现提供了控制依据。(4)基于TI公司DSP TMS320LF2407A处理器开发智能AMT控制节点主控板、采集驱动板和设定及监控模块硬件系统;讨论了汽车控制器电磁兼容与DSP系统抗干扰设计。(5)基于前面的硬件系统设计了信号采集与处理、SAE J1939通信、串口通信、离合器控制、选换档控制等系统底层软件模块,为系统集成和实验奠定了坚实的基础。更多还原

【Abstract】 Automated Mechanical Transmission (AMT) is formed to implement automatic shift through combining the traditional fixed shaft transmission and dry-type clutch with electric control unit (ECU), sensors and the corresponding actuator. AMT had been a very important trend since the middle of 70s last century because its transmission efficiency is higher, its cost is lower and its manufacture is easy.The performance of AMT is improved, perfected and enhanced with the application of electric technology and modern control technology. Especially in the middle of 90s last century, the equipped network on the vehicle was permeated to improve the control performance of AMT system and reduce the amount of sensor and wiring harness, which paved the way for the trade of AMT.The research is the important part of the science and technology tackle key project of chongqing—“The development of automatic mechanic transmission system and product for heavy-duty vehicle”and is an item—“The development of automatic mechanic transmission for heavy-duty commercial vehicle”which is sponsored by the“863”plan. According to the requirement of heavy-duty vehicle to modern AMT electric control system, based on the SAE J1939 protocol,the electric control system is regarded as a intelligence node of CAN communication network on board and designed by adopting digital signal processing chip (DSP)—TMS320LF2407A.This research is aiming at constructing and implementing the networked AMT electric control system. The electric injection engine (EDC7UC31) and the transmission of FAST are my research objects. The control strategies of clutch-engaging and select-shifting are established and the control programs for the corresponding blocks are developed.(1)The development trend of intelligence and networked control for AMT is presented based on the analyses for the progress and trend of AMT. The relation between engine, clutch and transmission in the AMT system is pointed out and the cooperation of each control subsystem is necessary. The constituents of the modern AMT system and the basic essential factors of constructing the networked AMT electric control system are analyzed.(2)The characteristics of CAN network and the contents of J1939 protocol and the PGN definition for electric control unit of EDC7UC31 engine are analyzed.Based on SAE J1939 protocol, the intelligent pitch point PDU code of the networked AMT are formulated, which lay the network control foundation for realizing networked AMT control system.(3)The control for clutch and transmission in AMT are studied, which provided some foundation for control system design and realization. The optimal dynamical shift rule of heavy-duty vehicle is constituted and the implement process of appling fuzzy logic to control clutch in the DSP system is discussed.(4)The main control board, sampling drive board and monitor block hardware system of intelligent AMT control node are developed based on DSP TMS320LF240A processor of TI corporation. At the same time, electromagnetism compatibility of vehicle controller and anti-jamming design for DSP system is discussed.(5)The signals sampling and processing block, SAE J1939 communication program, serial communication program, clutch control and select-shift control block are designed on the foundation of the above hardware system, which establish a solid foundation for the system integration and system test in the future.更多还原