Preventing soot underestimation in diesel particulate filters by determining the restriction sensitivity of soot
First Claim
1. A method of using an Electronic Control Module (ECM) in an Internal Combustion Engine for estimating a soot level within an exhaust gas particulate filter having an input and an output comprising:
- generating within the ECM a first soot load estimate within the exhaust gas particulate filter at a first time based upon a first pressure change from the input to the output of the exhaust gas particulate filter;
generating a second soot load estimate within the exhaust gas particulate filter at a second time based upon a second pressure change from the input to the output of the exhaust gas particulate filter;
calculating within the ECM a restriction sensitivity of the exhaust gas particulate filter utilizing a first restriction amount within the exhaust gas particulate filter at the first time, a second restriction amount at the second time, and the first and second soot load estimates within the exhaust gas particulate filter at the first and second times; and
selecting within the ECM a model based soot load estimate for the exhaust gas particulate filter when the restriction sensitivity falls below a predetermined threshold.
11 Assignments
0 Petitions
Accused Products
Abstract
A method of determining a need to perform regeneration of a diesel particulate filter in a diesel engine exhaust predicts a soot load of a diesel particulate filter with a pressure change based soot load estimate based upon a pressure change across the diesel particulate filter at a first time and a second time. A restriction sensitivity for the diesel particulate filter is calculated based upon the pressure change across the diesel particulate filter at the first time and the second time. The method transitions from the pressure change based soot load estimate to a model based soot accumulation estimate of the soot load of the diesel particulate filter upon the restriction sensitivity falling below a predetermined threshold. Regeneration of the diesel particulate filter is requested after the estimated soot level reaches a preset level based upon the soot accumulation model.
-
Citations
24 Claims
-
1. A method of using an Electronic Control Module (ECM) in an Internal Combustion Engine for estimating a soot level within an exhaust gas particulate filter having an input and an output comprising:
-
generating within the ECM a first soot load estimate within the exhaust gas particulate filter at a first time based upon a first pressure change from the input to the output of the exhaust gas particulate filter; generating a second soot load estimate within the exhaust gas particulate filter at a second time based upon a second pressure change from the input to the output of the exhaust gas particulate filter; calculating within the ECM a restriction sensitivity of the exhaust gas particulate filter utilizing a first restriction amount within the exhaust gas particulate filter at the first time, a second restriction amount at the second time, and the first and second soot load estimates within the exhaust gas particulate filter at the first and second times; and selecting within the ECM a model based soot load estimate for the exhaust gas particulate filter when the restriction sensitivity falls below a predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method of using an Electronic Control Module (ECM) in an Internal Combustion Engine for estimating a soot level within an exhaust gas particulate filter having an input and an output, the method comprising:
-
measuring a first pressure change from the input to the output of the exhaust gas particulate filter at a first time; identifying a first volumetric flow rate of exhaust gas at the first time; generating within the ECM a first soot load estimate within the exhaust gas particulate filter at the first time based upon the measured first pressure change; determining within the ECM a first restriction amount within the exhaust gas particulate filter at the first time utilizing the measured first pressure change and the identified first volumetric flow rate of the exhaust gas; measuring a second pressure change from the input to the output of the exhaust gas particulate filter at a second time; identifying a second volumetric flow rate of exhaust gas at the second time; generating a second soot load estimate within the exhaust gas particulate filter at a second time based upon the measured second pressure change; determining within the ECM a second restriction amount within the exhaust gas particulate filter at the second time utilizing the measured second pressure change and the identified second volumetric flow rate of the exhaust gas; calculating within the ECM a restriction sensitivity of the exhaust gas particulate filter utilizing the first and second restriction amounts and the first and second soot load estimates; and selecting within the ECM a model based soot load estimate for the exhaust gas particulate filter when the restriction sensitivity falls below a predetermined threshold.
-
-
11. A method of using an Electronic Control Module (ECM) attached to an Internal Combustion Engine for determining a need to perform regeneration of a diesel particulate filter in a diesel engine exhaust comprising:
-
predicting within the ECM a soot load of a diesel particulate filter with a soot load estimate based upon the pressure change across the diesel particulate filter at the first time and at the second time; calculating within the ECM a restriction sensitivity for the diesel particulate filter based upon pressure change across the diesel particulate filter at the first time and at the second time; and transitioning within the ECM from the soot load estimate based on pressure to a model based soot accumulation estimate upon the restriction sensitivity falling below a predetermined threshold. - View Dependent Claims (12, 13, 14, 15, 16)
-
-
17. A method of using an Electronic Control Module (ECM) in an Internal Combustion Engine for selecting a soot estimation model for a diesel particulate filter comprising:
-
monitoring a volumetric flow rate of engine exhaust; obtaining temperature of the diesel particulate filter; measuring a first pressure change from an input to an output of the diesel particulate filter at a first time; generating within the ECM a first soot load estimate within the diesel particulate filter at the first time based upon pressure change from the input to the output of the exhaust gas particulate filter; comparing within the ECM the first soot load estimate at the first time to a predetermined threshold; selecting within the ECM a first model based soot load estimate for the diesel particulate filter when the first soot load estimate is above the predetermined threshold; measuring a second pressure change from an input to an output of the diesel particulate filter at a second time; generating within the ECM a second soot load estimate within the diesel particulate filter at the second time based upon the second pressure change from the input to the output of the diesel particulate filter; calculating within the ECM a restriction sensitivity for the diesel particulate filter utilizing the first soot load estimate and the second soot load estimate; selecting within the ECM a model based soot load estimate for the diesel particulate filter when the restriction sensitivity is below a preset threshold. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
-
Specification