The motherboard of this system is composed of an ARM7 chip as its processing units,embedded operating system named uC/OS-Ⅱ and the graphical user interface software named MiniGUI were transplanted to the system.There are two parts in this system,one is the exhaust gas concentration data acquisition module and the other is signal-processing module.The main functions of the data collection module are filtering the water and dust from test gas,reading the data of component concentration,measuring the exhaust flow and wheel speed and raising voice of operation.The function of signal processing part includes inputting the information required by standard,displaying the measured data and the result of the comparison with standard,storing the measurement results in U disk storage and printing the result.%介绍了以ARM7处理器和uC/OS-Ⅱ操作系统为核心实现的便携式机动车尾气分析仪.系统是由尾气成分浓度数据采集和系统信号处理两部分组成.在数据采集部分主要完成待测气体的水分和除尘过滤、成分浓度数据读取、尾气流量测量、车轮转速测量和操作语音提示功能.在信号处理部分主要完成标准规定的信息数据输入,各测量数据的显示和标准限值的对比,测量结果的U盘存储和打印.
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