Corning Incorporated

Sam George

Achim Karl-Erich Heibel

Douglas Munroe Beall

Suhao He

Min Shen

Vishwanath Deshmane

Sandeep Viswanathan

Mahesh Govindareddy

An exhaust treatment method and apparatus for treating an exhaust stream flowing through an exhaust line housing in a downstream direction, the apparatus comprising a first particulate filter, an SCR unit, and a second particulate filter downstream of the SCR unit, all serially positioned in the exhaust line.

Exhaust treatment method and apparatus having particulate filters and SCR

An exhaust treatment apparatus for treating exhaust gas flowing through an exhaust line housing from an upstream location to a downstream location in a downstream direction, the exhaust treatment apparatus comprising a ceramic filter body having a honeycomb structure of a plurality of intersecting porous ceramic walls extending from a first end to a second end in an axial direction and defining a plurality of channels extending in the axial direction, wherein a first transverse face at the first end comprises metal oxide particles affixed to a portion of the intersecting walls. The metal oxide particles may be affixed to the upstream end, or the downstream end, or both the upstream and downstream ends. Preferably the metal oxide particles provide reinforcement to the underlying portion of the walls, and of the honeycomb structure itself.

Reinforced exhaust treatment article, exhaust line, and methods

Method, apparatus, and system to control ammonia slip in a selective catalytic reduction (SCR) system. The method includes detecting an engine operation transition event, increasing NOx to the SCR catalyst, and decreasing a reductant dose. The system includes a controller to receive an engine transition signal, anticipate a temperature transition at the SCR catalyst in response to the engine transition signal, and cause a NOx increase in the exhaust gas stream to the SCR catalyst and a decrease of reductant to the SCR catalyst coinciding with the temperature transition at the SCR catalyst. The apparatus includes a NOx increase module to cause the NOx increase in the exhaust gas stream to the SCR catalyst in response to the engine transition signal. The apparatus also includes a reductant shut-off module configured to cause the reductant addition to the exhaust gas stream to turn off in response to the engine transition signal.

Method, apparatus, and system to control selective catalytic reduction (SCR) catalyst ammonia slip during high temperature transitions

A method of controlling the operation of a particulate filter in an exhaust gas after-treatment system may comprise calculating a ratio of particulate loading rate to filter regeneration rate using a mass-based soot load estimation scheme and comparing the ratio of particulate loading rate to filter regeneration rate to a predetermined threshold value. The method may further comprise controlling operating conditions of the particulate filter to maintain the ratio of particulate loading rate to filter regeneration rate at a value above the predetermined threshold value.

Methods for controlling the operation of a particulate filter

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 NOconcentration. 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.

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Painted Post, NY, United States of America

Sam George