US2013086886A1PendingUtilityA1

Electrically heated oxidation catalyst particulate matter protection

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Individually held — no corporate assignee on recordPriority: Oct 6, 2011Filed: Oct 6, 2011Published: Apr 11, 2013
Est. expiryOct 6, 2031(~5.2 yrs left)· nominal 20-yr term from priority
Inventors:Eugene V. GonzeMichael J. Paratore, Jr.Michelangelo Ardanese
F01N 9/002F01N 3/035F01N 3/027Y02T10/40Y02A50/20F01N 13/009F01N 3/2066F01N 9/005F01N 3/103
42
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Claims

Abstract

A control method for a heating device of an oxidation catalyst is provided. The control method includes: estimating an accumulation of particulate matter on the heating device; and selectively controlling a switching device in electrical communication with the heating device based on the estimated accumulation.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A control method for a heating device of an oxidation catalyst, comprising:
 estimating an accumulation of particulate matter on the heating device; and   selectively controlling a switching device in electrical communication with the heating device based on the estimated accumulation.   
     
     
         2 . The method of  claim 1 , wherein the estimating the accumulation of particulate matter comprises:
 estimating particulate matter generated by an engine associated with the oxidation catalyst; and   estimating the accumulation of particulate matter based on the estimated generated particulate matter.   
     
     
         3 . The method of  claim 1 , wherein the selectively controlling the switching device comprises:
 selectively controlling the switching device to a first position to permit current flow to the heating device when the estimated accumulation is above a threshold.   
     
     
         4 . The method of  claim 3 , wherein the selectively controlling the switching device comprises:
 selectively controlling the switching device to a second position to prevent current flow to the heating device when the estimated accumulation is below the threshold.   
     
     
         5 . The method of  claim 3 , wherein the selectively controlling the switching device comprises:
 selectively controlling the switching device to a second position to prevent current flow to the heating device when regeneration is complete.   
     
     
         6 . An exhaust system of an engine, comprising:
 an oxidation catalyst;   a heating device associated with the oxidation catalyst; and   a control module that estimates an accumulation of particulate matter on the heating device, and that selectively controls a switching device in electrical communication with the heating device based on the estimated accumulation.   
     
     
         7 . The exhaust system of  claim 6 , wherein the control module estimates the accumulation of particulate matter by estimating particulate matter generated by the engine; and estimating the accumulation of particulate matter based on the estimated generated particulate matter. 
     
     
         8 . The exhaust system of  claim 6 , wherein the control module selectively controls the switching device by selectively controlling the switching device to a first position to permit current flow to the heating device when the estimated accumulation is above a threshold. 
     
     
         9 . The exhaust system of  claim 8 , wherein the control module selectively controls the switching device by selectively controlling the switching device to a second position to prevent current flow to the heating device when the estimated accumulation is below the threshold. 
     
     
         10 . The exhaust system of  claim 8 , wherein the control module selectively controls the switching device comprises by electively controlling the switching device to a second position to prevent current flow to the heating device when regeneration is complete. 
     
     
         11 . A vehicle, comprising:
 an engine;   an electrically heated oxidation catalyst that receives exhaust gas from the engine; and   a control module that controls current to the electrically heated oxidation catalyst based on an estimation of accumulated particulate matter in the oxidation catalyst.   
     
     
         12 . The vehicle of  claim 11 , wherein the control module estimates the accumulation of particulate matter on the heating device, and selectively controls a switching device in electrical communication with the electrically heated oxidation catalyst based on the estimated accumulation. 
     
     
         13 . The vehicle of  claim 12 , wherein the control module estimates the accumulation of particulate matter by estimating particulate matter generated by the engine; and estimating the accumulation of particulate matter based on the estimated generated particulate matter. 
     
     
         14 . The vehicle of  claim 12 , wherein the control module selectively controls the switching device by selectively controlling the switching device to a first position to permit current flow to the heating device when the estimated accumulation is above a threshold. 
     
     
         15 . The vehicle of  claim 14 , wherein the control module selectively controls the switching device by selectively controlling the switching device to a second position to prevent current flow to the heating device when the estimated accumulation is below the threshold. 
     
     
         16 . The vehicle of  claim 14 , wherein the control module selectively controls the switching device comprises by electively controlling the switching device to a second position to prevent current flow to the heating device when regeneration is complete.

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