FILTER FAILURE DETECTION DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

A failure of a filter (3) is detected with a higher degree of accuracy. There are provided a filter (3) that is arranged on an exhaust passage (2) of an internal combustion engine (1) for collecting a substance contained in an exhaust gas, a substance amount detection part (4) that is arranged on the exhaust passage (2) at a downstream side of the filter (3) for detecting an amount of substance in the exhaust gas, a flow speed detection part (10) that detects or estimates a flow speed of the exhaust gas which passes through the filter (3), and a determination part (10) that makes a determination that the filter (3) is in a failure, when the higher the flow speed of the exhaust gas passing through the filter (3), the larger a ratio of an amount of change in the amount of substance to an amount of change in the flow speed of the exhaust gas becomes.