Patent ID: 8161944
Filing Date: 2012-04-24
Classification: F01L,F01N,F02D,F02M,Y02A,Y02T

Abstract:
1. A control device of an internal combustion engine, comprising: a cylinder internal pressure sensor detecting a cylinder internal pressure of the internal combustion engine; internal energy correlation value calculating means for calculating an internal energy correlation value having correlation with internal energy consumed in the cylinder based on the cylinder internal pressure; a correcting means to correct the internal energy correlation value based on characteristics that an increasing rate of the internal energy correlation value becomes gentler when a load ratio of the internal combustion engine exceeds a predetermined value, the correcting means for not performing the correcting of the internal energy correlation value when the load ratio is less than or equal to the predetermined value and decreasing the increasing rate of the internal energy correlation value as the load ratio becomes large when the load ratio exceeds the predetermined value; and NOx concentration estimation means for calculating an NOx concentration estimated value in exhaust gas based on the internal energy correlation value which is corrected by the correcting means, wherein said internal energy correlation value calculating means includes an MFB calculating means for calculating an MFB as said internal energy correlation value based on said cylinder internal pressure, said MFB indicating a ratio of combustion terminated before arrival of a specific crank angle after a beginning of an expansion stroke.