【作者】 曲大为；

【导师】 李君；

【作者基本信息】 吉林大学 ， 动力机械及工程， 2008， 硕士

【摘要】 本文开发了应用于串联式混合动力客车的信息及诊断系统,该系统具有信息显示存储,故障在线诊断及远程通讯功能。本文完成了系统硬件设计及软件设计。以嵌入式为硬件平台,以WINCE为操作系统开发了具有人机交互界面的车载智能系统。解决了高频电路设计,嵌入式操作系统定制,多协议通讯,无线通讯,复杂数据库等技术难点。研究设计了系统中的故障在线诊断专家系统。根据应用对象(串联式混合动力客车)的特点分析,研究诊断规则及推理方法,最终完成了知识库,推理机及专家系统其余部分的设计。更多还原

【Abstract】 The research of vehicle information and diagnosis system dated from the ends of 1970s, and were applied in fault diagnosis of engineering field .The presentation of information and online fault diagnosis of hybrid electric vehicles (HEV) becomes an important research area and offers a challenge of artificial intelligence because of its complexity. Especially with the increase of electrical control system and vast information of modern car, fault diagnosis is developing towards hard and complex.Embedded system is a proprietory computer system with a core technology of embedded computer , user-oriented、product- oriented、application-oriented and software and hardware can be resized; be applicable to which is strict with function、reliability、costs、volume and power consumption and integrated performance. Embedded system is excellent in operational capability、reliability and real-time. This paper designs a hybrid electric vehicles (HEV) information and fault diagnosis system taking the embedded system as a hardware platform. The embedded microcontroller used in the system integrates the whole computer system into a single chip. This embedded microcontroller takes the ARMSYS2440 microcontroller kernel as the core, ROM/EPROM、RAM、bus、bus Logic、timing/counter、watchdog、I/O、serial port、impulse width modulation output、A/D、D/A、Flash RAM、EEPROM and other necessary function and peripheral were integrated in the inner chip. The peripheral circuit design finished the hardware development of the system.After the hardware design, we go on to design the software which includes the embedded system customization and embedded application program development and so on. Embedded operating system (EOS) is a broad-spectrum system software. EOS is responsible for the whole resource distribution and dispatching and control of the hardware and software of the embedded system. This paper customizes a WinCE operating system which is compact and efficient and upgradeable, and it is widely used in all kinds of embedded product. Windows CE is confirmed that it can meet the need of the 32 bit embedded program development through its ability. Following the customization of the system, we completed the human-computer interaction application program design of the vehicle information and diagnosis information. We use EVC as the tool to develop the program, using the Object-oriented advanced programming language C++ to make the program modular. The application program adopts the expert system during the fault diagnosis.The system need to diagnose the complex hybrid electric assembly automatically. This paper adopts expert system based on database to imitate human expert to diagnose the vehicle which fulfill field expert in diagnosis and realize the goal of communication between expert knowledge and experience, and can be collected and kept for a long time. The custom expert system was not widely used because of the long preparation time and vast regulations, and it is complex to alter and extend the knowledge base. In the mean time the storage and management and searches etc of database technology is very strong that can offset the weakness of custom expert system. So this paper builds a hybrid electric vehicles (HEV) online fault diagnosis expert system using database technology.Hybrid electric vehicles (HEV) information and fault diagnosis system connects to the node of CAN bus in the car, and swap data and information with other control system via the CAN bus so that we can get the running state of the car and the parameter of all the assembly. Then we can see the real-time information we need (the operator can operate the application program of embedded system to select what to see or save), and we can analyze the information we have got using the expert system, bring diagnostics concepts into the system to diagnose the vehicle for the complex Hybrid electric assembly . If the occasion should arise we can save the data and information into the SD card which we inserted in the embedded system in case we need to analyze the data off-line. At the same time we can transmit the data and information to the lab data center via the wireless networks real-time so the data can be collected and analyzed in the lab data center.更多还原