The Development Of Testing System On Motor Vehicles And The Study On Driving And Emission Property Of Motorcycles

As a important par of vehicles, the pollutant emission of motorcycles obtain more and more attention all around the world, and it is usually regarded as one of the most effective way to make strict regulation to control the total emission amount of motorcycles. Although there now exist several motorcycle emission regulation systems, such as those of Europe, US and Japan, a worldwide motorcycle emission test cycle is still believed to be needed accordance with the developing trend of technology and economics.The emission regulation now used in China is basically the same as that of Europe, and there's no doubt that this regulation will be replaced by WMTC (Worldwide Motorcycle Testing Cycle) sometime in the future. From this point of view, it is very important to study the differences between the driving character and emission character of WMTC and real-road driving condition in China. The results will be very useful to the accurate evaluation of the level and the percentage of motorcycle pollutant emission in the atmosphere.An on-board pollutant exhaust measuring system for on-road use of motor vehicles is developed. It basically consists of speed measuring system, fuel consumption measuring system and emission measuring system, as well as a laptop and a microchip. The measuring system enables direct and continuous determination of time trace of vehicle speed, fuel consumption factor and exhaust emission factor.The collection of the raw data, which indicates driving character of the motorcycles on the real-road condition, is carried out in some different types of road in Tianjin and Jinan. From the studying result, it can be seen that there exist great difference between the driving character of WMTC and real-road condition. Obviously, it means that the adaptability of WMTC in China is not so satisfied.Based on the raw data, a testing cycle accordance with the real-road driving character of motorcycle in China is obtained. This cycle can be carried out in laboratory. It can give relatively accurate evaluation and analysis of emission factors of motorcycles.The emissions characters of motorcycle under WMTC and real-road testing cycle are studied in detail, and the distribution property of emission factors, as well as its relationship with the driving property, is also obtained. It can be seen from the results that there's a great difference between the emission factors of WMTC and real-road testing cycle, which means that the emission factor obtained by WMTC can not give a real evaluation of emission level of motorcycles driving on the real road in China, It is very necessary to establish a perfect modification system for the further study later.