Method and engine control unit for checking the functioning of the pressure sensor in the air intake pipe or exhaust gas exhaust pipe of an internal combustion engine during operation

摘要

The invention relates to a method for checking the function of a pressure sensor 44 in an air intake pipe 20 or an exhaust gas exhaust pipe 30 of an internal combustion engine 1 during operation and an engine control unit 50 for carrying out said method. is about Based on this, dynamic pressure oscillations of the intake air of the air intake pipe 20 of the relevant internal combustion engine 1 or the exhaust gas of the exhaust gas exhaust pipe 30 are measured by the associated pressure sensor 44 during operation, and a number of The respective values BChk_W1...X of the determined operating characteristics of the internal combustion engine 1 using a discrete Fourier transform (DFT) for the selected signal frequencies SF1...X and the different signal frequencies SF1. A deviation value Aw_W1...Y of the determined value for ..X) is determined based on the obtained pressure oscillation signal DS_S. Depending on whether the determined deviation values Aw_W1...Y fall below or exceed a specified threshold value Aw_Gw, a satisfactory function of the pressure sensor 44 is confirmed (DSens = ok) or the pressure A malfunction (DSens_Ffkt) of the sensor 44 is diagnosed. Thus, it is achieved to monitor the satisfactory functioning of the pressure sensor 44 and to prevent malfunction of the internal combustion engine in the event of a fault and, in some cases, to prevent the emission of pollutants from being increased on the basis of this. action can be taken