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Growth of civilian cars, especially the high-speed expansion of private cars has brought great convenience to people's daily life, but also posed a serious environmental problem, the exhaust already constitute a public nuisance. Scientific analysis found that there is water vapor in the automobile exhaust O 2 H 2 N 2 the CO 2 , CO, HC compound OF NO x , the SO 2 , particulate matter, etc., which is harmful to the human body and influence of the composition of the natural environment growth called contaminants, there CO < sub> 2 the CO, HC compounds, NOX, SO 2 and particulate matter. According to statistics, a car for one year discharge exhaust is three times larger than its own weight. The standard, which was approved on March 2, 2005 in order to control vehicle emissions and improve air quality, the latest ignition engine automobile exhaust pollutant emission limits and measurement methods \car idling and idling conditions exhaust pollutants emission limits and measurement methods. The technical level of China's automobile exhaust analyzer and abroad, there is a big gap. This is mainly the: imperfect infrared gas analysis theory of basic research, not the system, not in-depth, the products affected by the environment, poor reliability, low level of automation, some high-performance products not independent intellectual property rights. The research in the subject vehicle exhaust gas analyzer measurement system to start from the concrete implementation of the program, introduced the development history and current situation of the domestic and foreign exhaust gas analyzer application the thermopile sensor knowledge of the narrative, measuring principle, electrochemical measurement principle theory explanations and specific design. The automobile exhaust analyzer for analysis of the five gases in the exhaust. Including measurement of carbon monoxide (CO), hydrocarbons (HC), carbon dioxide (CO 2 ) is the use of the principle of non-dispersive infrared absorption method. The nitrogen oxide (NO), and oxygen (O 2 ) is measured using the principle of electrochemical cell. The use of state-of-the-art filter technology, comparison measurements with excellent noise immunity performance. Equipped with a temperature sensor, in automobile exhaust is measured while measuring the temperature of the lubricating oil. The microprocessor-controlled way, and with a large-screen liquid crystal display Chinese characters miniature printer. One-button control, Chinese interface operation is simple. Data communication with the computer, and the field measurement results through the serial incoming computer for data processing. Instrument panel kanji micro printer with the measurement results, the measurement date printed out as data retention. The papers on the hardware and software of the system design process, measurement methods, measurement principle and sensor selection, made a more detailed analysis.
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