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Emission Control Technologies for 50 and 125 cc Motorcycles in Taiwan
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Abstract
The EPA of the Republic of China (Taiwan) will implement new emission regulations for 50-150 cc 2-stroke and 4-stroke motorcycles starting 1998. The exhaust emissions of motorcycles must be lower than 3.5 g/km CO and 2.0 g/km HC+NOx during the ECE-R40 driving cycle test. The emission legislation has a requirement for a catalyst durability life of 15,000 km. To comply with current legislation, the majority of 4-stroke motorcycles currently manufactured in Taiwan are fitted with secondary air systems, while 2-stroke motorcycles are fitted with catalytic converters. With this added equipment, 2-stroke and 4-stroke motorcycles generally can just achieve the emission targets when the motorcycles are new. However, it is an issue whether the exhaust emissions of motorcycles can meet the emission legislation after 15,000 km, because of the mass-production variation. This work presents some potential emission control strategies. Moreover, a variety of ageing methods was used to evaluate Pt/Rh and Pd-only catalysts that were installed in a 50 cc 2-stroke motorcycle and a 125 cc 4-stroke motorcycle. Our results reveal that the position of the induction of the secondary air is very important to achieve the optimal flow rate of the secondary air for a 50 cc 2-stroke motorcycle. Further, the removal capability of the catalytic converters for carbon monoxide and hydrocarbon emissions can be significantly improved by introducing secondary air. However, this results in the fact that the peak temperatures of a 50 cc 2-stroke and a 125 cc 4-stroke motorcycles will reach 1050 and 920°C, respectively. In order to overcome the severe thermal deactivation, a good thermal resistant catalyst or dual catalyst system should be considered.
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Wu, H., Yang, S., Wang, A., and Kao, H., "Emission Control Technologies for 50 and 125 cc Motorcycles in Taiwan," SAE Technical Paper 980938, 1998, https://doi.org/10.4271/980938.Also In
References
- Dedeoglu, N. Kajina, T. “Two-Stage Scavenging Improves Overall Engine Efficiency” SAE Technical Paper 881263 1988
- Sher E. et al. “Minimizing Short-Circuiting Losses in 2-S Engine by Throttling the Exhaust Pipe” SAE Technical Paper 901665 1990
- Lu Jau-Huai et al. “Studies on the Cyclic Variations of Single Cylinder Two-Stroke Engines-Cycle Analysis” SAE Technical Paper 950225 1995
- Kollmann, K. et al. “Secondary Air Injection with a New Developed Electrical Blower for Reduced Exhaust Emissions” SAE Technical Paper 940472 1994
- Gonzalez-Valasco et al. “Influence of water and Hydrocarbon processed in feedstream on the three-way behavior of platinum-alumina catalysts” Applied Catalysis B: Environmental 12 61 1997
- Tanaka H. et al. “Excellent Oxygen Storage Capacity of Perovskite-Pd Three-Way Catalysts” SAE Technical Paper 950256 1995
- Harkonen M. et al. “Performance and Durability of Palladium Only Metallic Three-Way Catalysts” SAE Technical Paper 94035 1994
- Matsuura S. et al. “Development of Three-Way Catalyst with Using Only Pd as Activator” SAE Technical Paper 950257 1995
- Hepburn J.S. et al. “Development of Pd-Only Three Way Catalyst Technology” SAE Technical Paper 941058 1994