Realisation and analysis of a new thermodynamic cycle for internal combustion engine

Abstract

This paper presents description and thermodynamic analysis of a new thermody-namic cycle. Realization of this new cycle is possible to achieve with valveless in-ternal combustion engine with more complete expansion. The main purpose of this new internal combustion engine is to increase engines thermal efficiency. The engine was designed so that the thermodynamic changes of the working fluid are different than in conventional engines. Specific differences are reflected in a more complete expansion of the working fluid (the expansion stroke is larger than compression stroke), valveless gas flowing and complete discharge of resi-dual combustion products from the combustion chamber. In this concept, the movement of the piston is different than in conventional piston mechanisms. The results obtained herein include the efficiency characteristics of irreversible reciprocating new engine cycle which is very similar to Miller cycle. The results show that with this thermodynamic cycle engine has higher efficiency than with the standard Otto cycle. In this article, the patent application material under number 2008/607 at the Intellectual Property Office of the Republic of Serbia was used.