METHOD OF MONITORING SOOT MASS IN A PARTICULATE FILTER AND MONITORING SYSTEM FOR SAME
First Claim
Patent Images
1. A method of monitoring soot mass in a particulate filter of an exhaust system comprising:
- predicting soot mass in the particulate filter based at least partially on a pressure differential between exhaust flowing into the filter and exhaust flowing out of the filter; and
revising the predicted soot mass based at least partially on measured operating parameters indicative of mass flow rate of nitrogen oxides in exhaust flow of the exhaust system and temperature of the particulate filter.
4 Assignments
0 Petitions
Accused Products
Abstract
A method of monitoring soot mass in a particulate filter of an exhaust system includes predicting soot mass in the particulate filter based at least partially on a pressure differential between exhaust flowing into the filter and exhaust flowing out of the filter. The predicted soot mass is then revised based at least partially on measured operating parameters indicative of mass flow rate of nitrogen oxides in exhaust flow of the exhaust system and temperature of the particulate filter.
22 Citations
18 Claims
-
1. A method of monitoring soot mass in a particulate filter of an exhaust system comprising:
-
predicting soot mass in the particulate filter based at least partially on a pressure differential between exhaust flowing into the filter and exhaust flowing out of the filter; and revising the predicted soot mass based at least partially on measured operating parameters indicative of mass flow rate of nitrogen oxides in exhaust flow of the exhaust system and temperature of the particulate filter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method of monitoring soot mass in a particulate filter of an exhaust system comprising:
-
measuring a first operating parameter indicative of mass flow rate of nitrogen oxides in exhaust flow of the exhaust system; measuring a second operating parameter indicative of temperature of the particulate filter; predicting soot mass in the particulate filter based at least in part on a third operating parameter indicative of a pressure difference between pressure of exhaust flow entering the particulate filter and pressure of exhaust flow exiting the particulate filter; estimating a deviation between the predicted soot mass and actual soot mass in the filter by fitting the measured first operating parameter, the measured second operating parameter and the predicted soot mass to a stored database of deviations between predicted soot mass and actual soot mass measured over multiple respective soot loading cycles of at least one filter that is substantially identical to the particulate filter, each of the deviations stored in the database being for a respective average modeled filter temperature and a respective average measured mass flow rate of nitrogen oxides over a respective one of the soot loading cycles; and revising the predicted soot mass by the estimated deviation. - View Dependent Claims (9, 10, 11, 12, 13)
-
-
14. A monitoring system for a particulate filter in an exhaust system for an engine comprising:
-
a nitrogen oxide sensor positioned at least partially in exhaust flow upstream of the particulate filter; a temperature sensor positioned at least partially in exhaust flow upstream of the particulate filter; a pressure sensor positioned in fluid communication with an inlet of the particulate filter; a processor that executes a first empirical algorithm that determines a predicted soot mass in the particulate filter based on a pressure measured by the pressure sensor; a second empirical algorithm that determines an expected deviation of the predicted soot mass from an actual soot mass in the filter based on operating parameters measured by the temperature sensor and the nitrogen oxide sensor indicative of filter temperature and mass flow rate of nitrogen oxides, respectively. - View Dependent Claims (15, 16, 17, 18)
-
Specification