Method for Operating An Exhaust Gas Aftertreatment Device of A Motor Vehicle

Content Provider	The Lens
Abstract	The present disclosure provides a method for operating an exhaust gas aftertreatment device for cleaning an exhaust gas flow of a motor vehicle with an internal combustion engine operated in normal mode with oxygen surplus. An oxygen store arranged downstream of an NOx storage catalyst of the exhaust gas aftertreatment device receives oxygen in normal mode, and during a regeneration mode emits oxygen for converting breakthrough hydrocarbons and/or carbon monoxide. The oxygen store is assigned to a particulate filter and/or an oxidation catalyst of the exhaust gas aftertreatment device. The particulate filter and/or the oxidation catalyst is arranged downstream of the NOx storage catalyst.
Related Links	https://www.lens.org/lens/patent/009-226-175-538-152/frontpage
Language	English
Publisher Date	2019-08-27
Access Restriction	Open
Content Type	Text
Resource Type	Patent
Jurisdiction	United States of America
Date Applied	2017-10-30
Agent	Burris Law, Pllc
Applicant	Ford Global Tech Llc
Application No.	201715797206
Claim	A method for operating an exhaust gas aftertreatment device for cleaning an exhaust gas flow of a motor vehicle, the motor vehicle including an internal combustion engine operable in at least a normal mode and a regeneration mode, wherein the internal combustion engine is operated with an oxygen surplus in the normal mode and is operated with a rich mixture during the regeneration mode, the exhaust gas aftertreatment device including an oxygen store and an NOx storage catalyst, wherein the oxygen store is downstream of the NOx storage catalyst such that exhaust gases received by the oxygen store have passed through the NOx storage catalyst, the method comprising: operating the internal combustion engine in the normal mode in which the oxygen store receives lean exhaust gas from the NOx storage catalyst; absorbing, within the oxygen store, excess oxygen from the lean exhaust gas until the oxygen store is full; switching operation of the internal combustion engine to the regeneration mode while the oxygen store is full; operating the internal combustion engine in the regeneration mode to provide the NOx storage catalyst with rich exhaust gas; and converting breakthrough hydrocarbons and/or carbon monoxide within exhaust gas received from the NOx storage catalyst during the regeneration mode by releasing oxygen from the oxygen store. The method as claimed in claim 1 , wherein the oxygen store is a coating containing at least one of cerium dioxide and zirconium dioxide, the coating being disposed on at least one of a particulate filter and an oxidation catalyst. The method as claimed in claim 1 , further comprising: determining an oxygen value of the oxygen store; switching operation of the internal combustion engine from the regeneration mode to the normal mode based on the oxygen value; comparing the oxygen value with a target oxygen value; and ending the regeneration mode when the comparison of the oxygen value with the target oxygen value shows that the oxygen value is equal to or less than the target oxygen value. The method as claimed in claim 3 , wherein the oxygen value is determined using a model during regeneration mode. The method as claimed in claim 4 , further comprising: determining, via the model, aging effects of the exhaust gas aftertreatment device. The method as claimed in claim 4 , wherein the model is configured to provide a lambda simulation value (λ mod ). The method as claimed in claim 6 , wherein the lambda simulation value (λ mod ) is indicative of a lambda value (λ eng ) downstream of the internal combustion engine, temperature, mass flow (m flow ) and oxygen value (O2LNT). The method as claimed in claim 6 , further comprising: measuring a lambda value (λ meas ) downstream of the NOx storage catalyst; and comparing, via the model, the lambda simulation value (λ mod ) with the lambda value (λ meas ) to provide age-induced tracking in the oxygen value (O2LNT). The method as claimed in claim 8 , further comprising: controlling a duration of the regeneration mode, via a control unit, based on the age-induced tracking in the oxygen value (O2LNT) provided by the mode The method as claimed in claim 3 , wherein the oxygen value (O2LNT) is determined by temperature measurements indicative of at least one of temperature of the oxygen store, mass flow (m flow ), and a lambda value (λ eng ). An exhaust gas aftertreatment device for cleaning an exhaust gas flow of a motor vehicle with an internal combustion engine operable with oxygen surplus in a normal mode and with a rich mixture in a regeneration mode, the exhaust gas aftertreatment device comprising: an NOx storage catalyst; an oxygen store arranged downstream of the NOx storage catalyst such that exhaust gas passing through the oxygen store is received from the NOx storage catalyst, the oxygen store being configured to absorb oxygen when the internal combustion engine is operated in the normal mode and being configured to emit oxygen for converting at least one of breakthrough hydrocarbons and carbon monoxide; and a control unit configured to operate the internal combustion engine in the normal mode until the oxygen store is full, to switch operation of the internal combustion engine to the regeneration mode while the oxygen store is full, and to operate the internal combustion engine in the regeneration mode to regenerate the NOx storage catalyst. The exhaust gas aftertreatment device as claimed in claim 11 , wherein the oxygen store includes a coating containing at least one of cerium dioxide and zirconium dioxide, the coating being disposed on at least one of the particulate filter and the oxidation catalyst. The exhaust gas aftertreatment device as claimed in claim 11 , wherein the control unit is configured to determine an oxygen value of the oxygen store, and to end operation of the internal combustion engine in the regeneration mode when a comparison of an oxygen value measured downstream of the NOx storage catalyst with a target oxygen value shows that the oxygen value is equal to or less than the target oxygen value. The exhaust gas aftertreatment device as claimed in claim 13 , further comprising a model implemented on the control unit and configured for determining the oxygen value during the regeneration mode. The exhaust gas aftertreatment device as claimed in claim 14 , wherein the oxygen value is determined by temperature measurements indicative of at least one of temperature of the oxygen store, mass flow, and a lambda value. The exhaust gas aftertreatment device as claimed in claim 14 , wherein the model is configured to determine aging effects of the exhaust gas aftertreatment device. The exhaust gas aftertreatment device as claimed in claim 14 , wherein the model is configured to provide a lambda simulation value. The exhaust gas aftertreatment device as claimed in claim 17 , wherein the lambda simulation value is indicative of a lambda value downstream of the internal combustion engine, temperature, mass flow and oxygen value. The exhaust gas aftertreatment device as claimed in claim 17 , wherein the model compares the lambda simulation value with a lambda value measured downstream of the NOx storage catalyst to provide age-induced tracking in the oxygen value. A motor vehicle with an exhaust gas aftertreatment device as claimed in claim 11 .
CPC Classification	Gas-Flow Silencers Or Exhaust Apparatus For Machines Or Engines In General;Gas-Flow Silencers Or Exhaust Apparatus For Internal Combustion Engines Separation Technologies For Adaptation To Climate Change Climate Change Mitigation Technologies Related To Transportation
Examiner	Jonathan R Matthias
Extended Family	146-497-019-202-958 019-843-798-602-786 009-226-175-538-152 057-336-002-376-042
Patent ID	10392997
Inventor/Author	Harmsen Jan Balenovic Mario
IPC	F01N9/00 F01N3/021 F01N3/08 F01N3/10
Status	Active
Owner	Ford Global Technologies Llc
Simple Family	146-497-019-202-958 019-843-798-602-786 009-226-175-538-152 057-336-002-376-042
CPC (with Group)	F01N3/2066 B01D53/9418 F01N3/101 F01N9/005 F01N3/021 F01N3/0814 F01N3/0842 F01N3/0864 F01N3/0871 F01N3/103 F01N2900/1402 F01N2900/1602 Y02A50/20 Y02T10/40 F01N9/002 F01N2550/20
Issuing Authority	United States Patent and Trademark Office (USPTO)
Kind	Patent/New European patent specification (amended specification after opposition procedure)