Abstract
Reduction of exhaust gas emissions and CO2 from gasoline engine vehicles which dominate the automotive market are important to solve problems of the air pollution in major cities and the global warming. Attempts are made to investigate the maximum potential of the gasoline engine for reduction of bothitems focusing on the technology of variable valve timing (VTEC) engine with three way catalyst system. 8% improvement of fuel economy by the application of VTEC to the small displacement (1.21) and high speed engine compared with the same performance vehicle with 2.01 engine. For another application of VTEC, high-swirl combustion by inlet-one-valve-deactivated mechanism of VTEC at low engine speed can reduces HC during cold start and contributes to achieves ULEV standard. The fuel economy of this ULEV improved 4% compared with LEV equipped with the conventional engine. And the performance of VTEC engine for ULEV increased 11kW (15Ps) and 9.8 Nm (1 kgm) compared with the conventional engine.
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