Patent ID: 7401504

Claim:
A method of detecting a start of combustion (SOC) in a diesel engine using an in-cylinder pressure, comprising the steps of: i) detecting a DP value defined as a difference pressure between an in-cylinder combustion pressure and a motoring pressure; ii) detecting a crank angle (CA DPxx ) at a point where the detected DP value is a specific pressure; iii) defining an angle difference between the start of combustion (SOC) and the crank angle (CA DPxx ) as a detected delay angle (ΔCA DD ) and determining the detected delay angle (ΔCA DD ) through an experiment of measuring the start of combustion (SOC) and the crank angle (CA DPxx ); and iv) detecting the SOC using the following Equation: SOC= CA DPxx −ΔCA DD .