Research And Development Of In-use Vehicle Exhaust Gas Measurement System

The pollution control of in-use vehicles exhaust is an important and complex systems engineering. On the experiences and lessons learned that one of the most effective measures to control exhaust pollution is the implementation of stringent I/M (Inspection/Maintenance) (testing/maintenance) system. Currently, emission measurement systems for gasoline car include IM240, VMAS, ASM and idle state method. At the same time, free acceleration method and full load method are used for diesel vehicles.The measurements'applicability, the economics of testing equipment and the test systems'generalizability need to be carefully considered. In this paper, VMAS is the main test method used for in-use gasoline car while idle state method supplementary. Meanwhile, the main inspection method about diesel vehicles is free acceleration method. And full load method is supplementary.In the second chapter, test methods for in-use gasoline car are designed and developed. Firstly, the vehicle mass analysis system and idle state method are introduced. Then, purchase suitable hardware and built VMAS system and idle state method system. The same work is done for in-use diesel vehicles in chapterâ…¢. Control system software is researched and developed under the test methods system in the fourth chapter. It is validated that the control system software can complete the inspection task. In order to verify the repeatability of the systems, a large number of vehicle testes are done in chapter. Some issues related to the stability of test systems are discussed.This paper is finished on time. And the experiment results show the scheme is designed reasonable and the test systems'repeatability is great.