Patent ID: 9145815
Filing Date: 2015-09-29
Classification: F01N,Y02T

Abstract:
1. A method comprising: receiving signals from a particulate matter sensor relating to an amount of particulates at a point in time within a time period in a diesel engine exhaust stream; calculating one or more running statistical parameters, over a time interval, relating to a particle mass in the diesel engine exhaust stream; determining, using a distribution of the amount of particulates during the time interval, an upper control limit for the amount of particulates; receiving a threshold for an allowable amount of particulates in the diesel engine exhaust stream; comparing the threshold to one or more of (a) a current instantaneous particulate reading from the particulate matter sensor and (b) the upper control limit for the amount of particulates; and in response to the comparing, detecting an engine failure or an after-treatment system failure when one or more of the current instantaneous particulate reading and the upper control limit for the amount of particulates are above the threshold; wherein the upper control limit for the amount of particulates is defined by one or more characteristics of the particulate matter sensor.