Patent ID: 8091414
Filing Date: 2012-01-10
Classification: F01N,Y02T

Abstract:
1. A method of detecting replacement of a particulate matter filter by a non-particulate matter filter, comprising: monitoring a change in pressure drop over a time period across a region expected to contain the particulate matter filter; comparing the monitored change in pressure drop against a change in pressure drop that would be expected if the particulate matter filter is present in the region; and determining if the particulate matter filter has been replaced with the non-particulate matter filter based on the following criteria: (1) the particulate matter filter has been replaced with the non-particulate matter filter if the monitored change in pressure drop does not meet or exceed the expected change in pressure drop; (2) the particulate matter filter has not been replaced with the non-particulate matter filter if the monitored change in pressure drop meets or exceeds the expected change in pressure drop, wherein if the particulate matter filter has been determined to be replaced with the non-particulate matter, a fault is logged to indicate the replacement of the particulate matter filter by the non-particulate matter filter.