Abstract
A new gasoline combustion system of high compression ratio was studied and proposed in order to achieve higher thermal efficiency than that of a conventional SI engine. A special cranking mechanism was adopted which allowed the piston to move rapidly near TDC. Numerical simulations were performed to achieve higher thermal efficiency. As a result, this concept can be operated at the compression ratio of 14 using regular gasoline. A new single cylinder engine with the special gear system was designed and built for proving its performance. The experimental results show that a knocking limit has improved and better indicated thermal efficiency has been obtained. A cam mechanism driven by a planetary gear was also designed and built to achieve higher engine speed.
Keywords:Engine Combustion, Knocking, Piston-crank mechanism, Compression ratio, SI engine