Abstract: A method for regenerating a particulate filter may comprise calculating a first estimated soot load of a particulate filter based on a pressure drop of an exhaust gas flowing through the particulate filter, and calculating a second estimated soot load of the particulate filter based on a mass balance of soot in the particulate filter. The method may further comprise calculating a hybrid estimated soot load based on the first estimated soot load and the second estimated soot load, wherein calculating the hybrid estimated soot load comprises applying at least one gate so as to weight a relative contribution of each of the first estimated soot load and the second estimated soot load to the hybrid estimated soot load, and causing regeneration of the particulate filter when the hybrid estimated soot load is greater than or equal to a threshold value.

Abstract: A method for regenerating a particulate filter may comprise calculating a soot layer state correction factor based on a rate of regeneration and a rate of particulate loading in the particulate filter and calculating an estimated soot load in the particulate filter based on a pressure drop of an exhaust gas flowing through the particulate filter and the calculated soot layer state correction factor. The method for regenerating the particulate filter may further comprise causing regeneration of the particulate filter when the estimated soot load is greater than or equal to a threshold value.

Abstract: Mass based methods and systems for estimating soot load in a filter of an after-treatment system for exhaust stream are provided. The after-treatment system can comprise a sensor, a filter, and a processor configured to estimate soot load in the filter based on a mass based multi-layer model. An example system includes a virtual sensor comprising an estimator for providing information corresponding to a filter outlet NO2 concentration. An example method includes the steps of providing the mass based multi-layer model, passing the exhaust stream through the filter, and using the sensor to monitor a condition of the exhaust stream. The example method further includes the steps of calculating a total regeneration rate based on the multi-layer model by solving a second-order ordinary differential equation with a plurality of parameters using an analytical approach, and estimating the soot load based on the calculated total regeneration rate.

Abstract: Systems and methods for controlling temperature and total hydrocarbon slip in an exhaust system are provided. Control systems can comprise an oxidation catalyst, a particulate filter, a fuel injector, and a processor for controlling a fuel injection based on an oxidation catalyst model. Example system includes a virtual sensor comprising a controller for calculating and providing the total hydrocarbon slip to subsystems for after-treatment management based on modeling the oxidation catalyst. Example methods for controlling the temperature and the total hydrocarbon slip in an exhaust system include the steps of providing an oxidation catalyst model, monitoring a condition of the exhaust system, calculating a hydrocarbon fuel injection flow rate and controlling a fuel injection. The example methods further include the steps of determining an error in the oxidation catalyst model based on the monitored condition and changing the oxidation catalyst model to reduce the error.

Abstract: A method for regenerating a particulate filter may comprise calculating a first estimated soot load of a particulate filter based on a pressure drop of an exhaust gas flowing through the particulate filter, and calculating a second estimated soot load of the particulate filter based on a mass balance of soot in the particulate filter. The method may further comprise calculating a hybrid estimated soot load based on the first estimated soot load and the second estimated soot load, wherein calculating the hybrid estimated soot load comprises applying at least one gate so as to weight a relative contribution of each of the first estimated soot load and the second estimated soot load to the hybrid estimated soot load, and causing regeneration of the particulate filter when the hybrid estimated soot load is greater than or equal to a threshold value.

Abstract: A method for regenerating a particulate filter may comprise determining a temperature, a flow rate, and a total pressure drop of an exhaust gas flowing through a particulate filter, and determining a corrected soot layer permeability. The method may further comprise calculating an estimated soot load of the particulate filter based on the total pressure drop and the corrected soot layer permeability, and causing regeneration of the particulate filter when the estimated soot load is greater than or equal to a threshold value.

Abstract: Systems and methods are provided for controlling an exhaust stream temperature at a point along an exhaust system. The exhaust system can include an oxidation catalyst, a particulate filter having an outlet, and a fuel injector for injecting fuel into an exhaust stream at a location upstream from the outlet. An adaptive control can be provided to model a portion of the exhaust system. A fuel injection flow rate at which fuel is injected into the exhaust stream by the fuel injector can be calculated based on the adaptive control model. An operation of the fuel injector can be controlled based on the calculated fuel injection flow rate, to control the exhaust stream temperature at point along the exhaust system. A condition of the exhaust stream can also monitored and an error in the adaptive control model can be determined based on the monitored condition. The adaptive control model can also be changed to reduce the error.