Patent ID: 9702787
Date: 2017-07-11
CPC Classifications: F02D,G01L,G01M

Claim:
1. An in-cylinder pressure detecting apparatus for an internal combustion engine, for detecting an in-cylinder pressure which is a pressure in a combustion chamber of said engine, said in-cylinder pressure detecting apparatus comprising: in-cylinder pressure detecting means for detecting the in-cylinder pressure and output the detected in-cylinder pressure; motoring pressure estimating means for estimating a motoring pressure corresponding to an in-cylinder pressure when no combustion is performed in said combustion chamber; detected pressure peak value obtaining means for obtaining a peak value of the detected in-cylinder pressure as a detected pressure peak value in a predetermined operating condition of said engine; estimated motoring pressure peak value calculating means for calculating an estimated motoring pressure peak value which is a peak value of the motoring pressure estimated by said motoring pressure estimating means, the estimated motoring pressure peak value corresponding to the detected pressure peak value; and sensitivity correcting means for comparing the detected pressure peak value with the estimated motoring pressure peak value, and performing sensitivity correction of said in-cylinder pressure detecting means based on a result of the comparison, wherein the predetermined operating condition is an operating condition in which an exhaust gas temperature raising control is performed for raising a temperature of exhaust gases from said engine by increasing an intake air amount of said engine and retarding an ignition timing of said engine.