Research On Motorcycle Carbon Canister Matching Technology For Meeting To Chinese Emission Regulation Ⅲ

During resent years, along with the improvement of motorcycle industry, the produce and sale amount of the motorcycle exceed 27 million and the export amount exceed 8 million in 2008. At the same time, the number of retained motorcycle grew up steadily and reached 88 million. The number shows a fact that pollution of motorcycle discharge is deteriorating. The nation has promulgated《motorcycle and light motorcycle fuel evaporant emission limitvalue and texting methods》(GB 20998-2007),《motorcycle fuel evaporant emission limitvalue and texting methods》(national third stages, GB 14622-2007), Which require two-wheel motorcycles implemented the Chinese Emission RegulationⅢstandards and fuel evaporative standards strictly since July 1,2010. The motorcycle industry will face serious challenges. Carburetor motorcycle and EFI motorcycle coexistence is the status quo of China's motorcycle industry. Therefore, solve the fuel evaporation control problems of two types of motorcycle is necessary and imperative.First, fuel vapor control technology related issues of the carbureted motorcycle was described in the thesis. The research indicated that, the key technology of motorcycle evaporative emission control focus on the activated carbon canister's performance and matching evaporative emission control system to motorcycle.The effect factors of activated carbon canister's performance was studied, and has simulated the flow distribution inside the canister. The results were used to optimize canister's performance, a lot of experiments have verified the rationality of technical approaches.Second, the simulation study was carried out on the pressure distribution of motorcycle intake system, and the distribution law of pressure was acquired. The intake pressure via engine crank angle has provided theoretical basis to determine the opening time of PCV valve and desorption effects. A fuel vapor control system model of carbureted motorcycle was bulit, which was based on calculations and test results.Through the Chinese Emission RegulationⅢtesting and fuel vapor control tests, the rules which evaporative emission control system affect the emissions has been studied, the research proved that:this design theory and the fuel vapor control system can meet the Chinese Emission RegulationⅢstandards and fuel vapor control standards.