Research progress review of the detection and measuring methods on in-use vehicle emission

The present paper would like to make a comprehensive research revision over the detection and measuring methods of the in- use vehicle emission.As is known,as the environmental pollution problem has been becoming an ever more social and environmental concern,more and more advanced efficient and reliable technologies and facilities are called for to help to reduce the emissions of the exhausts from the vehicles in use.In answering to the urgent need,we would like to make a summery of a few kinds of currently used detection and examination methods and principles in this connection,such as Idling Method,Double Idling Method,ASM,IM240/IM195 and VMAS.However,particular stress should be here put on the methods of Acceleration Simulation Mode(ASM) and Vehicle Mass Analysis System(VMAS) with the testing facilities used by the two methods being introduced.In edition,the above said detection methods are going to be compared,so as to find the optimal detection methods that are most suitable for the current application.More accurately speaking, ASM method usually assumes two condition tests:ASM5025 and ASM2540.In contrast to the steady loading method based on the concentration of the emission,the quality emission test prefer to take up more accurate simulation of the vehicles' actual working conditions and more objective and impartial evaluation of the vehicles' emission situation.When the ASM method is used and experimental comparison of the method with the idling one or the double idling one,three vehicle emissions are likely to be found with the ASM method,that is,HC,CO and NO_x comprehensively,which implies that the method is more suitable for car emissions detection.As to IM195 and VMAS,it can be said that it is more suitable for new car authentication emission test.When retrogress goes briefly on the recent research advances of the domestic and foreign exhaust detection technologies, it is necessary to point out that research prospects in this way can probably be found in the following methods,such as the CAN bus technology,the virtual instrument technology,the intra-pulse spectroscopy technology,the cavity ring-down spectroscopy technology, the fuzzy temperature compensation technology and so on.However, more research work has to be done before the above methods are successfully to be adapted to meet the needs of the ever-changing situation of vehicle exhaust detection markets in China and bring positive contributions to the protection of our eco-environment.