ABNORMALITY DETECTION DEVICE FOR IN-CYLINDER PRESSURE SENSOR, ABNORMALITY DETECTION METHOD FOR IN-CYLINDER PRESSURE SENSOR AND CONTROL APPARATUS FOR INTERNAL COMBUSTION ENGINE

摘要

An object of the present invention is to provide an abnormality detection device for an in-cylinder pressure sensor and an abnormality detection method for an in-cylinder pressure sensor that is able to detect preload loss abnormality of an in-cylinder pressure sensor. An in-cylinder pressure sensor 5 has a strain gauge element 20 to which preload was given. Under an operating state of an internal-combustion engine, it is judged whether Pim/Pex that is a ratio of intake pressure Pim to exhaust gas pressure Pex is 1. Reset of temperature drift is performed when Pim/Pex is 1. If an output voltage V (Pim) which serves as a base of calculation of Pim after the reset of a temperature drift is equal to a circuit limit value Vmin, existence of preload loss abnormality is determined.