Abstract
In these days, improving fuel economy of SI engine is required in the world due to energy securities and environmental issues such as climate change. Engine thermal efficiency is affected by knocking whose occurrence timing is governed by the ignition characteristics of the air fuel mixture. In this study, relationship between the fuel chemical reaction characteristics, knocking indicator such as octane numbers and the engine operating condition is clarified. And the knocking indicator p-T map is clarified with comparison of engine experiment.
