Combustion detecting method of engine

Abstract

A combustion phase detection method is 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 a heat release can be effectively calculated at an early state of the combustion by using a combustion pressure and a motoring pressure difference of an engine not affected by an offset value of the cylinder pressure. The combustion phase detection method of an engine may include detecting a combustion phase according to fuel injection timing by using a specific point of DHdP that is calculated by the following heat release equation: DHdP:∫1/γ−1VdPdiff/dθdθ. Here, Pdiff is a difference (Pdiff=P−Pmotoring) between a cylinder measure combustion pressure (P) and a motoring pressure (Pmotoring).

Dependencies are inferred from the claim text.