Provision for Emission Reduction of Sports Utility Motorcycle

Paper #:
  • 1999-01-3259

Published:
  • 1999-09-28
Citation:
Mishina, F. and Ohira, T., "Provision for Emission Reduction of Sports Utility Motorcycle," SAE Technical Paper 1999-01-3259, 1999, https://doi.org/10.4271/1999-01-3259.
Pages:
9
Abstract:
The purpose of this study was to find compatible specifications both of emission reduction and high power output with good throttle response for a sports utility motorcycle. In the emission reduction challenge, we examined equipping the exhaust system with a catalytic converter to achieve sufficient emission reduction. The catalytic converter, however, caused a temperature rise in the exhaust system, which caused a pressure propagation change. Additional muffler design optimization effectively maintained high performance and acceleration. The exhaust valve device was also optimized for emission reduction and high power output over a wide engine speed range. The optimized control of the exhaust valve was beneficial to preventing short-circuit of fresh mixture gas and early activation of the catalyst. Such comprehensive specifications could satisfy the performance and driveability characteristics required for sports utility motorcycles.
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