Malfunction detection device of cylinder internal pressure sensor, malfunction detection manner of cylinder internal pressure sensor, control unit of internal combustion engine

摘要

It is possible to detect the preload coming out abnormality of the cylinder internal pressure sensor, the malfunction detection device of the cylinder internal pressure sensor, or malfunction detection manner of the cylinder internal pressure sensor is offered. The cylinder internal pressure sensor (5) has the strain gauge component where the preload is granted (20). Whether or not in stream of the internal combustion engine, ratio Pim/Pex of manifold pressure Pim and exhaust air pressure Pex 1 it decides. When Pim/Pex 1 being, the temperature drift is reset. After the resetting the temperature drift, agrees to V (Pim) circuit limiting value Vmin which becomes the foundation of the calculation of Pim, if is, it decides that it is the preload coming out abnormal.