Patent ID: 7610139
Filing Date: 2009-10-27
Classification: G01L,G01M

Abstract:
1. An in-cylinder pressure detection device for an internal combustion engine, comprising: an in-cylinder pressure sensor for detecting pressure within a cylinder of the engine as a detected in-cylinder pressure; motoring pressure-estimating means for estimating pressure generated in the cylinder during a non-combustion period as a motoring pressure; atmospheric pressure-detecting means for detecting an atmospheric pressure; motoring pressure-correcting means for correcting the estimated motoring pressure according to the detected atmospheric pressure; correction parameter-identifying means for identifying correction parameters such that a difference between the detected in-cylinder pressure detected during a compression stroke of the engine and the corrected motoring pressure becomes minimum; and in-cylinder pressure-correcting means for correcting the detected in-cylinder pressure by the identified correction parameters, to thereby calculate an in-cylinder pressure.