Patent ID: 8849549
Filing Date: 2014-09-30
Classification: F02D,G01M

Abstract:
1. A method of controlling combustion of a diesel engine, comprising: a vibration measuring step of measuring vibrations generated in the engine; a measurement region setting step of setting a measurement region for predicting a section where an LPP (location of peak pressure) is expected to be, wherein the measurement region is set to be from about 3 degrees before an LPP generation predicted location that is predicted from vibration data measured in the vibration measuring step to about 3 degrees after the LPP generation predicted location with respect to a crank angle; a frequency transforming step of transforming a vibration signal set in the measurement region setting step to a frequency response function; a frequency integrating step of integrating the frequency response function transformed in the frequency transforming step; an LPP detecting step of selecting a location of a peak pressure from the frequency response function integrated in the frequency integrating step; an estimated value determining step of selecting an LPP offset and an SOC (start of combustion) offset by using the LPP detected in the LPP detecting step; an error determining step of determining an LPP value error and an SOC value error by comparing the estimated LPP value and the estimated SOC value determined in the estimated value determining step with a target LPP value and a target SOC value; and a combustion correcting step of correcting and controlling combustion by using the errors determined in the error determining step.