ABNORMALITY DETECTION DEVICE OF FILTER

To provide an abnormality detection device of filter capable of performing abnormality detection with high accuracy.SOLUTION: An abnormality detection device of filter includes: a first acquisition part for acquiring a first pressure which is a pressure further on the upstream side than a filter out of an exhaust passage; a second acquisition part for acquiring a second pressure which is a pressure further on the downstream side than the filter out of the exhaust passage; a first detection part for detecting abnormality in the exhaust passage, in the case where the second pressure is higher than a predetermined pressure; a first correction part for, in the case where abnormality in the exhaust passage is detected, correcting the first pressure to the value in the case of the exhaust passage being normal; a second correction part for, in the case where abnormality in the exhaust passage is detected, correcting the second pressure to the value in the case of the exhaust passage being normal; and a second detection part for detecting abnormality in the filter based on a difference between the corrected first pressure and the corrected second pressure.SELECTED DRAWING: Figure 2 【課題】精度の高い異常検出を行うことが可能なフィルタの異常検出装置を提供することを課題とする。【解決手段】排気通路のうちフィルタより上流側の圧力である第１圧力を取得する第１取得部と、前記排気通路のうち前記フィルタより下流側の圧力である第２圧力を取得する第２取得部と、前記第２圧力が所定の圧力より高い場合、前記排気通路の異常を検出する第１検出部と、前記排気通路の異常が検出された場合、前記第１圧力を前記排気通路が正常である場合の値に補正する第１補正部と、前記排気通路の異常が検出された場合、前記第２圧力を前記排気通路が正常である場合の値に補正する第２補正部と、補正された前記第１圧力と、補正された前記第２圧力との差に基づいて、前記フィルタの異常を検出する第２検出部と、を具備するフィルタの異常検出装置。【選択図】図２