The Study Of Analysis Technology Of Automotive Exhaust

According scientific analysis, the automotive exhaust contains many materials, such as vapour, 0₂, H₂, N₂, C0₂, CO, HC, N0_x, S0₂, particle, etc. Especially, C0₂, CO, HC, N0_x, S0₂, particle material are harmful to human health and natural environment. It has been become an serious social problem.It is a worldwide environmental protection project to treat the automotive exhaust. It propels the revolution of automotive industry and the development of related industry, such as fuel, purificatory technology and monitor device. In common method of gas analysis, the infrared ray optics absorbable apparatus has been widely used in the world because it has high precision and sensitivity, fast response, large measure range, good selectivity and stability and reliability, rapid and continuous detection.Now the pollution of the automotive exhaust is getting worse and the standard for detecting the exhaust is becoming more rigid, so the aim of the project is to eliminating the effect of environmental interference and improving the accuracy of detection and friendly interface for user operating. And the user can evaluate the technical status of engine, in particular, fuel-supply system and ignition system. Aim at the problem occurred in automotive infrared analysis apparatus, targeting at the engineering application , the project has done the work as follows: the first, analog signal acquisition and A/D transition: using automotive exhaust sampling device to put the exhaust into device, then the infrared sensor produces the analog signal while the exhaust passes through the gas chamber. As the analog signal value produced directly from the sensor is less and is accompanied with interference signal, it must be amplified and anti-interference work must be done also. After the signal has been processed, then sent to A/D transition device and the right digit can be gotten. The second is the calculation of various parameters. Different parameters adopt different formula to calculate and use the compensation way not the same according to the influence of signal against environment, and the final right, accurate data can...