汽车尾气质量检测系统设计论文.doc

汽车尾气质量检测系统设计 摘 要 对汽车排放污染物的治理，是世界性的环保课题。它推动了汽车工业的革命，同时带动了燃料、净化技术及监测仪器等相关产业的发展。常用的气体分析方法中，红外光学吸收方式仪器的优点是精度和灵敏度高、响应速度快、测量范围大、选择性、稳定性和可靠性好，可以快速和连续检测。因此受到各国重视，获得广泛应用。 本论文尽可能消除环境干扰影响，提高尾气检测的精确性。能够在实际中根据结果评价发动机的技术状况，特别是燃油供给系统和点火系统的技术状况。本文通过对汽车尾气检测系统的设计，展开了以下工作： 一是在环境的影响基础上，本文进一步验证在不同的温度和压力下，尾气检测结果不同；二是利用汽车尾气取样设备，把尾气送入尾气分析仪器，尾气在通过气室的过程中，红外传感器产生模拟信号，传感器直接产生的模拟信号一般都比较微弱，并且有干扰信号，必须对它们进行放大、滤波，并有效地排除干扰信号；三是利用进气歧管压力传感器、进气歧管温度传感器测取进气压力和进气温度，利用发动机转速传感器得到发动机转速；四是采用不分光红外分析法测量尾气排放参数，同时根据红外气体分析装置结构原理建立了理论数学模型, 并以此模型搭建检测系统；五是用碳平衡法得出试验车的油耗。测试得到的瞬态油耗可以结合四种排放污染物的体积浓度计算得到质量排放率；五是各项参数数值的计算，并根据检测结果受环境影响的大小，采用不同的补偿方法，最终得到正确的结果。 关键词：汽车尾气 质量百分比 尾气检测 系统设计 Automobile Exhaust Gas Detection System Design ABSTRACT To control vehicle emissions of pollutants, is a worldwide environmental protection project. It promoted the revolution in the automotive industry, also contributed to the development of the fuel, purification technology and monitoring equipment and other related industries. The common gas analysis method, the advantages of infrared optical absorption apparatus is high precision and sensitivity, fast response, wide measurement range, good selectivity and stability and reliability, rapid and continuous detection. So valued by many countries , widely used. In this paper, as far as possible to eliminate the effect of environmental interference, improve the accuracy of the exhaust gas detection. Can technology in the actual situation according to the results of evaluation of engine, especially the technical condition of the fuel supply system and ignition system. In this paper, through the design of automobile exhaust detection system, work carried out the following: One is the analog signal acquisition, processing and conversion, the paper in the process of data acquisition due to outside interference, resulting in the test results is not accurate enough, in view of the outside interference analysis the influence