Patent ID: 8781711

Claim:
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 equation DR ⁢ ⅆ V ⁢ : ⁢ ⁢ P diff ⁢ ⅆ V ⅆ θ max ( P diff ⁢ ⅆ V ⅆ θ ) wherein V is a combustion chamber volume; and detecting, by the ECU, a combustion phase based on the calculated specific point of DRdV.