Combustion detecting method of engine

摘要

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⁢ⅆV⁢:⁢⁢Pdiff⁢ⅆVⅆθmax(Pdiff⁢ⅆVⅆθ);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.

主权项

1. A combustion phase detection method, comprising:
determining, by an engine control unit (ECU), a pressure difference (Pdiff) between a cylinder measure combust pressure (P) and a motoring pressure (Pmotoring), wherein Pdiff=P−Pmotoring; calculating, by the ECU, a specific point of a normalized heat release (DRdV) through the following equationDR⁢ⅆV⁢:⁢⁢Pdiff⁢ⅆVⅆθmax(Pdiff⁢ⅆVⅆθ) wherein V is a combustion chamber volume; and detecting, by the ECU, a combustion phase based on the calculated specific point of DRdV.