Vehicle Emission Exhaust Testing Research And System Development

With the automobile widespread use in the world, the by-product of the automobile civilization—automobile exhaust pollution which caused the environmental pollution question is increasingly conspicuous. As deeply awareness for vehicle emission characteristics and hazard, Peoples formulated increasingly stringent vehicle emissions regulations. How to control vehicle emissions of pollutants has become an important research topic in the world, various inspection technologies unceasingly emerged too.This paper first elaborated on the domestic and international automobile emission testing system development status and trends, deeply discussed formation mechanism,effect factors,testing principle of the automobile exhaust pollutants, introduced current domestic, international vehicle's emission regulations and standards and analyzed the automobile exhaust testing method. Based on the above discussions, unified the automobile actual traveled condition, made certain accelerated simulation conditions (ASM working condition) as the inspection method of the test system. This method characteristic is that the instrument cost and the use maintenance cost is low, it tested the entire automobile exhaust emission under the loaded condition and more approached the automobile exhaust situation on the path.Take the CDM-1000 automobile chassis dynamometer as the testing installment simulated the path travel operating mode, the NHA-501 emission analyzer as the testing instrument. This article has carried on the development more and the function expansion for two equipments. In the premise of satisfied the automobile emission testing of steady acceleration simulation conditions and developed the inspection system of the automobile exhaust through the newest software establishment technology.Taking the serial communication agreement of between the two emission test equipments as the foundation, Using the Serial communication technologies and characteristics of the Cserial, designed the communication interface circuit and control sections between the exhaust analyzer and PC, constructed the hardware of the automobile exhaust inspection system. In the software aspect, using the object-oriented programming techniques and visible programming language Visual C++6.0 as the developed platform, designed the friendly interface for the inspection system, Meanwhile integrated the designed interface described system function and the operation process.The system unified organically the computer inspection technology, the industry control computer technology, the network communication and the electronic surveying technology. By the combination of each kind of technical application, the automobile exhaust test system has realized the real-time and automatic test and raised the automobile exhaust tested level and precision.