Patent ID: 8966882
Filing Date: 2015-03-03
Classification: F01N,Y02T

Abstract:
1. A vehicle comprising: an engine that generates an exhaust stream; an exhaust system in fluid communication with the engine, wherein the exhaust system includes a particulate filter that removes suspended particulate matter from the exhaust stream; a sensor that measures a differential pressure across the particulate filter; and a controller in communication with the sensor that includes a processor and a tangible, non-transitory memory device on which is recorded instructions for calculating, as an executable efficiency diagnostic of the particulate filter, an efficiency of the particulate filter, and for selectively enabling or disabling execution of the efficiency diagnostic of the particulate filter; wherein the controller is configured to receive the measured differential pressure from the sensor, and to enable or disable the execution of the efficiency diagnostic of the particulate filter as a function of the received measured differential pressure, including enabling the execution of the efficiency diagnostic when a differential pressure offset value of the sensor is less than a calibrated differential pressure offset value and disabling the execution of the efficiency diagnostic when the differential pressure offset value of the sensor exceeds the calibrated differential pressure offset value.