Methods for Monitoring and Modelling Thermal Characteristics of Oxidation Catalyst Devices

Content Provider	The Lens
Abstract	Methods for monitoring thermal characteristics of oxidation catalyst (OC) catalytic composition(s) (CC) are provided, and comprise communicating exhaust gas to the OC, and determining a temperature change of the CC for the time frame based on a plurality of heat sources including heat imparted to the CC from exhaust gas enthalpy, heat imparted to the CC via oxidation of HC and/or CO in exhaust gas, heat imparted to the CC via water present in the exhaust gas condensing on the CC or heat removed from the CC via water evaporating from the CC, and optionally heat exchanged between the CC and the ambient environment. Heat imparted to the CC via water condensing on the CC can be determined using an increasing relative humidity proximate the CC, and heat removed from the CC via water evaporating from the CC can be determined using a decreasing relative humidity proximate the CC.
Related Links	https://www.lens.org/lens/patent/011-502-158-247-986/frontpage
Language	English
Publisher Date	2019-06-18
Access Restriction	Open
Content Type	Text
Resource Type	Patent
Jurisdiction	United States of America
Date Applied	2017-04-19
Applicant	Gm Global Tech Operations Llc
Application No.	201715491000
Claim	A method for monitoring thermal characteristics of an oxidation catalyst device (OC), wherein the OC is configured to receive exhaust gas and includes a first catalytic composition (CC) disposed in a first housing having an inlet and an outlet and capable of oxidizing one or more of combustable hydrocarbons (HC) and carbon monoxide (CO), the method comprising: communicating exhaust gas to the OC for a time frame, wherein the exhaust gas comprises water and one or more of HC and CO; determining a temperature change of the CC for the time frame based on a plurality of heat sources comprising: heat imparted to the CC from an exhaust gas enthalpy, heat imparted to the CC via oxidation of the HC and/or CO, heat exchanged between the CC and an ambient environment of the OC; and heat imparted to the CC via water condensing on the CC or heat removed from the CC via water evaporating from the CC. The method of claim 1 , wherein the heat imparted to the CC via water condensing on the CC is determined based on an increase in a relative humidity proximate the CC, and heat removed from the CC via water evaporating from the CC is determined based on a decrease in the relative humidity proximate the CC. The method of claim 2 , wherein the relative humidity proximate the CC is determined using the specific humidity of the exhaust gas, the pressure of the exhaust gas proximate the OC, and an initial temperature of the CC temporally proximate the beginning of the time frame. The method of claim 3 , wherein the initial temperature comprises a dry temperature determined using heat imparted to the CC from the exhaust gas enthalpy, heat imparted to the CC via oxidation of the HC and/or CO, and optionally heat exchange between the CC and the ambient environment of the OC during the time frame. The method of claim 3 , wherein the relative humidity proximate the CC is determined using the specific humidity of the exhaust gas, the pressure of the exhaust gas proximate the OC, and a temperature of the CC determined or measured prior to the time frame. The method of claim 1 , wherein condensed water is present proximate the CC for at least a portion of the time frame. The method of claim 1 , wherein the CC comprises zeolite. The method of claim 1 , wherein the CC comprises a platinum group meta A method for determining a temperature of an oxidation catalyst device (OC) of a vehicle, wherein the vehicle is comprises an internal combustion engine (ICE) configured to receive and subsequently combust air and fuel and expel the combustion products as exhaust gas, and the OC is configured to receive the exhaust gas and includes a catalytic composition (CC) disposed in a first housing having an inlet and an outlet and capable of oxidizing one or more of combustable hydrocarbons (HC) and carbon monoxide (CO), the method comprising: determining an initial temperature of the CC for a time frame; communicating exhaust gas to the OC during the time frame, wherein the exhaust gas comprises water and one or more of HC and CO; determining the thermal energy added to the CC during the time frame based on a plurality of heat sources comprising: heat imparted to the CC from an exhaust gas enthalpy, heat imparted to the CC via oxidation of the HC and/or CO, and heat imparted to the CC via water condensing on the CC or heat removed from the CC via water evaporating from the CC; converting the thermal energy added to the CC to a CC temperature change; and combining the CC temperature change with the initial temperature. The method of claim 9 , wherein the water present in the exhaust gas includes one or more of water present in the air, water present in the fuel, and water created during the combustion of the fue The method of claim 9 , wherein the time frame is temporally proximate an ICE cold start, and the initial temperature of the CC comprises an ambient temperature proximate the vehicle. The method of 9 , wherein the heat imparted to the CC via water condensing on the CC is determined based on an increase in a relative humidity proximate the CC, and heat removed from the CC via water evaporating from the CC is determined based on a decrease in the relative humidity proximate the CC. The method of claim 12 , wherein the relative humidity proximate the CC is determined using the specific humidity of the exhaust gas, the pressure of the exhaust gas proximate the OC, and the initial temperature of the CC. The method of claim 13 , wherein the initial temperature comprises a dry temperature determined using heat imparted to the CC from the exhaust gas enthalpy, heat imparted to the CC via oxidation of the HC and/or CO, and optionally heat exchange between the CC and an ambient environment of the vehicle. The method of claim 9 , wherein the initial temperature of the CC is below a water sorption threshold. The method of claim 9 , wherein the thermal energy added to the CC during the time frame is further determined based on heat exchanged between the CC and an ambient environment of the vehicle. The method of claim 16 , wherein the heat exchanged between the CC and the ambient environment of the vehicle is determined using one or more of a speed of the vehicle and the ambient temperature. The method of claim 9 , wherein the CC comprises zeolite. The method of claim 9 , wherein the CC comprises a platinum group meta A method for determining a temperature of an oxidation catalyst device (OC) of a vehicle, wherein the vehicle comprises an internal combustion engine (ICE) configured to receive and subsequently combust air and fuel and expel the combustion products as exhaust gas, and the OC is configured to receive the exhaust gas and includes a catalytic composition (CC) disposed in a first housing having an inlet and an outlet and capable of oxidizing one or more of combustable hydrocarbons (HC) and carbon monoxide (CO), the method comprising: determining an initial temperature of the CC, wherein the initial temperature is below a water sorption threshold; communicating exhaust gas to the OC for a time frame, wherein the exhaust gas comprises water and one or more of HC and CO; determining a temperature change of the CC for the time frame based on a plurality of heat sources comprising: heat imparted to the CC from an exhaust gas enthalpy, heat imparted to the CC via oxidation of the HC and/or CO, heat exchanged between the CC and an ambient environment of the ICE exhaust gas treatment system, and heat imparted to the CC via water condensing on the CC or heat removed from the CC via water evaporating from the CC; and determining a final temperature of the CC for the time frame by combining the initial temperature of the CC with the temperature change of the CC.
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 Climate Change Mitigation Technologies Related To Transportation Chemical Or Physical Processes; E.G. Catalysis Or Colloid Chemistry;Their Relevant Apparatus
Examiner	Patrick D Maines Dapinder Singh
Extended Family	004-949-046-757-815 176-317-186-414-066 145-756-403-053-587 011-502-158-247-986 043-441-214-241-023
Patent ID	10323561
Inventor/Author	Smith Michael A Dean Charles E Esposito Raffaele
IPC	F01N3/10 B01D53/94 B01J23/40 B01J29/00 F01N3/20 F01N9/00 F01N11/00
Status	Active
Owner	Gm Global Technology Operations Llc
Simple Family	004-949-046-757-815 176-317-186-414-066 011-502-158-247-986 145-756-403-053-587 043-441-214-241-023
CPC (with Group)	F01N11/00 F01N3/106 F01N3/2006 F01N2570/10 F01N2570/12 F01N11/002 B01D53/944 B01D53/9495 B01D2255/102 B01D2255/50 B01D2258/012 F01N3/103 F01N9/005 F01N11/005 F01N2370/04 F01N2510/063 F01N2560/025 F01N2560/028 F01N2560/06 F01N2560/07 F01N2900/0422 F01N2900/08 F01N2900/1402 F01N2900/1404 F01N2900/1602 F01N2900/1628 F01N2900/1631 Y02T10/12 Y02T10/40 B01J23/40 B01J29/00
Issuing Authority	United States Patent and Trademark Office (USPTO)
Kind	Patent/New European patent specification (amended specification after opposition procedure)