Combustion detecting method of engine

Abstract

A combustion phase detection method of an engine has the advantages of being able to reduce exhaust gas and to improve combustion stability, to compensate injection and ignition delay time between combustion chambers and between cycles, and to detect a combustion phase in real time such that a heat generation rate and heat release can be effectively calculated in an early state of combustion with a simple calculation method to control combustion of an engine, by using a combustion pressure and a motoring pressure difference of an engine not affected by an offset value of the cylinder pressure. For this, a combustion phase detection method may include detecting a combustion phase by using a specific point of DRdV as follows: DR   V  :   P diff   V  θ max ( P diff   V  θ ) Here, the Pdiff (P-Pmotoring) is a difference between a cylinder measure combust pressure (P) and a motoring pressure (Pmotoring), and V is a combustion chamber volume.

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