System for reducing emissions generated from diesel engines used in low temperature exhaust applications

Abstract

Systems and methods for using off-board regeneration technology are disclosed herein. According to one method, off-board regeneration technology is used to allow a diesel particulate filter to be effectively used for an engine application having an operating temperature less than the operating temperature at which the diesel particulate filter would normally be capable of passively regenerating.

1 . A method for obtaining verification for a diesel particulate filter for use in applications having duty cycles with average temperature profiles greater than 240 degrees Celsius for less than 40 percent of the duty cycles, the method comprising:
 submitting a verification application that includes data showing that the diesel particulate filter satisfies predetermined emission reduction targets when used to treat exhaust generated from diesel engines used in applications having duty cycles with average temperature profiles greater than 240 degrees Celsius for less than 40 percent of the duty cycles, the diesel particulate filter being used in combination with off-board regeneration equipment including at least one of an off-board heating device for combusting soot on the diesel particulate filter and an off-board air moving device adapted for blowing soot from the diesel particulate filter.   
   
   
       2 . The method of  claim 1 , wherein the verification application is an application for CARB level 2 verification, and wherein the data shows that the diesel particulate filter satisfies an emission reduction target required for the diesel particulate to be verified as a CARB level 2 device. 
   
   
       3 . The method of  claim 1 , wherein the verification application is an application for CARB level 3 verification, and wherein the data shows that the diesel particulate filter satisfies an emission reduction target required for the diesel particulate to be verified as a CARB level 3 device. 
   
   
       4 . The method of  claim 1 , wherein the verification application includes data showing that the diesel particulate filter satisfies predetermined emission reduction targets when used to treat exhaust generated from diesel engines used in applications having duty cycles with average temperature profiles greater than 220 degrees Celsius for less than 40 percent of the duty cycles. 
   
   
       5 . The method of  claim 1 , wherein the verification application includes data showing that the diesel particulate filter satisfies predetermined emission reduction targets when used to treat exhaust generated from diesel engines used in applications having duty cycles with average temperature profiles greater than 200 degrees Celsius for less than 40 percent of the duty cycles. 
   
   
       6 . The method of  claim 1 , wherein the diesel particulate filter is not catalyzed with a precious metal catalyst. 
   
   
       7 . The method of  claim 1 , wherein the diesel particulate filter has a precious metal catalyst loading of less than 50 grams per cubic foot of filter substrate. 
   
   
       8 . The method of  claim 1 , wherein the diesel particulate filter is required to be removed from an exhaust system of the diesel engine during regeneration. 
   
   
       9 . A method for obtaining governmental verification for a diesel particulate filter, the method comprising:
 verifying the diesel particulate filter in combination with off-board regeneration equipment, the off-board regeneration equipment including at least one of an off-board heating device for combusting soot on the diesel particulate filter and an off-board air moving device adapted for blowing soot from the diesel particulate filter.   
   
   
       10 . The method of  claim 9 , wherein the diesel particulate filter is not catalyzed with a precious metal catalyst. 
   
   
       11 . The method of  claim 9 , wherein the diesel particulate filter has a precious metal catalyst loading of less than 50 grams per cubic foot of filter substrate. 
   
   
       12 . The method of  claim 9 , wherein the diesel particulate filter is required to be removed from an exhaust system of the diesel engine during regeneration. 
   
   
       13 . A method of providing technology for use in treating exhaust gas emitted from diesel engines for low temperature applications, the method comprising:
 providing a diesel particulate filter system that does not include active, on-board regeneration, the diesel particulate filter system being verified by a governmental agency in combination with off-board regeneration equipment, the off-board regeneration equipment including at least one of an off-board heating device for combusting soot on the diesel particulate filter and an off-board air moving device adapted for blowing soot from the diesel particulate filter.   
   
   
       14 . The method of  claim 13 , wherein the diesel particulate filter is not catalyzed with a precious metal catalyst. 
   
   
       15 . The method of  claim 13 , wherein the diesel particulate filter has a precious metal catalyst loading of less than 50 grams per cubic foot of filter substrate. 
   
   
       16 . The method of  claim 13 , wherein the diesel particulate filter is required to be removed from an exhaust system of the diesel engine during regeneration. 
   
   
       17 . A method for treating exhaust from a diesel engine used for an application having an initially measured temperature profile, the method comprising:
 treating diesel engine exhaust with a diesel particulate filter intentionally designed to not be capable of being regularly passively regenerated at the initially measured temperature profile; and   regenerating the diesel particulate filter with off-board regeneration equipment, the off-board regeneration equipment including at least one of an off-board heating device for combusting soot on the diesel particulate filter and an off-board air moving device adapted for blowing soot from the diesel particulate filter.   
   
   
       18 . The method of  claim 17 , wherein the diesel particulate filter is not catalyzed with a precious metal catalyst. 
   
   
       19 . The method of  claim 17 , wherein the diesel particulate filter has a precious metal catalyst loading of less than 50 grams per cubic foot of filter substrate. 
   
   
       20 . The method of  claim 17 , wherein the diesel particulate filter is required to be removed from an exhaust system of the diesel engine during regeneration.