Control device for internal combustion engine

Abstract

An ECU includes a cooling water temperature sensor, an intake air temperature sensor, a storage unit, a determination unit, and a calibration unit. In an after-run control performed after the internal combustion engine stops, the determination unit compares a cooling water temperature Tw detected by the cooling water temperature sensor with a first threshold value Tand determines that the environment is not the cold environment in which an EGR differential pressure sensor is likely to be frozen, if the cooling water temperature Tw is equal to or higher than the first threshold value T, or if the cooling water temperature Tw is less than the first threshold value Tbut is equal to or higher than a second threshold value Twhich is lower than the first threshold value Tand an intake air temperature Ta from the intake air temperature sensor is equal to or higher than a third threshold value T, and determines that the environment is the cold environment otherwise. When the environment is determined as not to be the cold environment, the calibration unit obtains a calibration reference value based on the detection value from the EGR differential pressure sensor. The storage unit stores the calibration reference value obtained by the calibration unit.