汽车运行参数记录仪开发及其应用研究

发布时间：2018-09-18 16:21

【摘要】：汽车运行参数记录仪是一种用于汽车启动后进行汽车相关数据记录的仪器。其记录的数据可以还原汽车的行驶状况,反映驾驶员对汽车的使用情况。当发生事故时,其记录保存的数据可以作为一种证据帮助执法者进行事故原因分析和责任的界定。鉴于以上意义,本文研究和设计了一种基于英飞凌XC2785单片机和嵌入式实时操作系统Free RTOS的汽车运行参数记录仪方案。首先,本文针对汽车记录仪,对其开发应用的背景和意义进行了分析论述。阐述了早期汽车记录仪的起源背景,及其使用之后产生的社会意义,以及近年来国内外研究人员对其进行的研究努力。接着本文对汽车记录仪的总体框架进行了规划设计,介绍了系统总体设计思路,形成了对汽车记录仪系统硬件层面的分析规划。从单片机的选型及其编程、仿真到系统的电源模块,外围数据采集设备,系统通信电路的使用进行了详细分析。然后论文对软件系统进行了设计,完成了Free RTOS的移植、系统任务的调度方案设计。其中Free RTOS的移植部分分析了Free RTOS内核移植所需的文件,以及编译器所要进行的配置,以使Free RTOS可以工作在XC2785单片机之中。系统任务的调度规划中分析了任务所要实现的系统功能,以及实现这些功能的逻辑顺序。最后论文对试验采集数据处理办法进行了研究,对通过数据采集设备获得的数据进行提取整合处理之后,按照数据类别、数据特点进行打包,然后对其进行存储。其中,对于惯性传感器测得的横摆角速度和侧向加速度,由于其采集频率高于存储频率,所以在采集之后可以通过在单片机中已经完成离线训练的神经网络模型推算出驾驶员方向盘转角。当处理器检测到用户要求数据上传的信号之后,将已经存储的数据取出,进行数据上传。之后用户在PC端,通过上位机接收数据并进行保存。
[Abstract]:The vehicle running parameter recorder is a kind of instrument used to record the automobile data after the automobile starts. The recorded data can restore the driving condition of the vehicle and reflect the driver's use of the vehicle. In the event of an accident, the recorded data can be used as evidence to help the law enforcement to analyze the cause of the accident and define the responsibility. In view of the above significance, this paper studies and designs a scheme of automobile running parameter recorder based on Infineon XC2785 microcontroller and embedded real-time operating system Free RTOS. Firstly, the background and significance of the development and application of automobile recorder are analyzed and discussed in this paper. This paper describes the background of the origin of the early automobile recorder and its social significance after its use, as well as the research efforts made by researchers at home and abroad in recent years. Then, the overall frame of the vehicle recorder is designed, the overall design idea of the system is introduced, and the analysis and planning of the hardware level of the system is formed. From the singlechip selection and programming, simulation to the power module of the system, peripheral data acquisition equipment, the use of the system communication circuit is analyzed in detail. Then, the software system is designed, the transplantation of Free RTOS and the scheduling scheme of system task are completed. The porting part of Free RTOS analyzes the files needed for porting the Free RTOS kernel and the configuration of the compiler so that Free RTOS can work in the XC2785 MCU. The system functions to be implemented and the logical sequence of these functions are analyzed in the scheduling planning of system tasks. Finally, the experimental data processing method is studied. After the data collected by the data acquisition equipment is extracted and integrated, the data is packaged according to the data category and the characteristics of the data, and then stored. For the yaw velocity and lateral acceleration measured by the inertial sensor, the acquisition frequency is higher than the storage frequency. So the steering angle of the driver can be calculated by the neural network model which has completed the off-line training in the single chip microcomputer. When the processor detects the signal of the user requesting data upload, the stored data is removed and the data is uploaded. Then the user in the PC end, through the host computer to receive data and save.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U463.7

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