US20210404361A1 - Exhaust aftertreatment system with thermally controlled reagent doser - Google Patents
Exhaust aftertreatment system with thermally controlled reagent doser Download PDFInfo
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- US20210404361A1 US20210404361A1 US16/916,725 US202016916725A US2021404361A1 US 20210404361 A1 US20210404361 A1 US 20210404361A1 US 202016916725 A US202016916725 A US 202016916725A US 2021404361 A1 US2021404361 A1 US 2021404361A1
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- doser
- exhaust
- reducing agent
- passageway
- cooling element
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/16—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an electric heater, i.e. a resistance heater
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
- F01N2590/08—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for heavy duty applications, e.g. trucks, buses, tractors, locomotives
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/11—Adding substances to exhaust gases the substance or part of the dosing system being cooled
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1811—Temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present disclosure relates to exhaust aftertreatment systems for automotive applications, and particularly to the incorporation of reagent dosers into such systems.
- the exhaust aftertreatment system includes an exhaust conduit and a reducing agent mixer having a mixing can and a doser mounted to the mixing can.
- the mixer is configured to mix a reducing agent injected by the doser with exhaust gas moving through the system.
- the mixing of the reducing agent with exhaust gas is designed to cause a chemical reaction and reduce Nitrous Oxides (NOx) in the exhaust gas when reacted by the catalyst.
- NOx Nitrous Oxides
- the doser includes a doser body, plurality of valves, and a thermal management system.
- the doser body includes a housing that defines an internal chamber, an inlet passageway that opens into the internal chamber to admit reducing agent from an associated reducing agent tank, and an outlet passageway that opens from the internal chamber into the exhaust passageway.
- the plurality of valves includes an inlet valve and an outlet valve that are configured to selectively allow or block flow of reducing agent through the respective inlet or outlet passageway.
- the thermal management system is configure to manage the temperature of the components in the doser.
- the thermal management system includes a heater and at least one cooling element.
- the heater is configured to selectively heat reducing agent in the internal chamber of the housing before injection of the reducing agent into the exhaust passageway. Heating the reducing agent prior to injection into the exhaust passageway encourages reaction with the exhaust gases to improve reduction of NOx in the exhaust gases.
- the cooling element is coupled to at least one electronic component included in the doser to cool the at least one electric component so as to prevent the at least one electronic component from overheating during operation of the doser in the exhaust aftertreatment system.
- FIG. 1 is perspective view of an over-the-road automotive vehicle including an internal combustion engine and an exhaust aftertreatment system with a doser configured to deliver a reducing agent into engine exhaust gases flowing through an exhaust passageway define by an exhaust conduit;
- FIG. 2 is a diagrammatic view of the exhaust aftertreatment system included in the over-the-road vehicle of FIG. 1 showing that the doser includes a doser body that includes inlet and outlet passageway to admit reducing agent into the doser, a plurality of valves to control the flow through the inlet and outlet passageway, and a thermal management system configured to control the temperature of the components included in the doser;
- FIG. 3 is a detail diagrammatic view of the doser included in the system of FIG. 2 showing the thermal management system of the doser includes a heater arranged in the doser body to selectively heat reducing agent before injection of the reducing agent into the exhaust passageway and cooling elements coupled to the valves to cool the electronic components of the valves so as to prevent the valves from overheating during operation of the doser in the exhaust aftertreatment system; and
- FIG. 4 is a side elevation view of the exhaust aftertreatment system included in the over-the-road vehicle of FIG. 1 showing the doser mounted to a mixer can located downstream of a diesel particulate filter included in the exhaust aftertreatment system.
- An illustrative over-the-road vehicle 10 includes an engine 12 and an exhaust aftertreatment system 14 in accordance with the present disclosure is shown, for example, in FIG. 1 .
- the engine 12 is, illustratively, an internal combustion engine 12 configured to combust fuel and discharge exhaust gases that are carried through an exhaust passageway 16 defined by an exhaust conduit 17 , treated by the exhaust aftertreatment system 14 , and then released into the atmosphere.
- the exhaust aftertreatment system 14 is configured to reduce various effluents in the exhaust gases, such as, for example, nitrogen oxides (NOx), before the exhaust gases are released to the atmosphere.
- NOx nitrogen oxides
- the exhaust aftertreatment system 14 includes a plurality of exhaust aftertreatment devices such as, for example, a diesel oxidation catalyst (DOC) 18 , a diesel particulate filter (DPF) 20 , and a selective catalytic reduction unit (SCR) 22 , and a reducing agent mixer 24 .
- the exhaust gases pass through or by each of the aftertreatment devices to remove or reduce different effluents.
- the reducing agent mixer 24 is mounted upstream of the SCR 22 and is configured to inject and mix a reducing agent, illustratively a urea solution, into the exhaust gases. Chemical reaction of the reducing agent with the exhaust gases occurs in downstream of the reducing agent mixer 24 in the SCR 22 to reduce NO x to produce treated exhaust gases before being released in the atmosphere.
- the reducing agent mixer 24 includes a mixing can 26 and a doser 28 as shown in FIGS. 1 and 2 .
- the mixing can 26 is coupled fluidly with the exhaust passageway 16 to receive the exhaust gases flowing therethrough.
- the reducing agent is stored on the vehicle 10 in a reducing agent tank 30 and is conducted to the doser 28 to be injected into the mixing can 26 .
- the doser 28 includes a doser body 32 , a plurality of valves 34 , 36 , and a thermal management system 38 as shown in FIGS. 2 and 3 .
- the doser body 32 includes a housing 40 that defines an internal chamber 42 , an inlet passageway 44 , and an outlet passageway 46 .
- the inlet passageway 44 opens into the internal chamber 42 to admit reducing agent from the reducing agent tank 30
- the outlet passageway 46 opens from the internal chamber 42 into the exhaust passageway 16 of the exhaust aftertreatment system 14 .
- the valves 34 , 36 include an inlet valve 34 that selectively allows or blocks a flow of reducing agent through the inlet passageway 44 into the internal chamber 42 and an outlet valve 36 that selectively allows or blocks a flow of reducing agent through the outlet passageway 46 into the exhaust passageway 16 .
- the thermal management system 38 is configured to manage the temperature of the components included in the doser 28 .
- the thermal management system 38 includes a heater 48 , at least one cooling element 50 and a control unit 54 as shown in FIGS. 2 and 3 .
- the heater 48 is configured to selectively heat reducing agent in the internal chamber 42 of the housing 40 before injection of the reducing agent into the exhaust passageway 16 .
- the cooling element 50 is coupled to at least one electronic component included in the doser 28 to cool the at least one electric component so as to prevent the at least one electronic component from overheating during operation of the doser 28 in the exhaust aftertreatment system 14 .
- the control unit 54 is configured to direct the heater 48 to selectively apply heat and the cooling element 50 to selectively cool the components in the doser 28 .
- the doser 28 may be a flash-boil doser 28 .
- the heater 48 may be configured to heat the reducing agent in the internal chamber 42 and thereby increase a pressure within the internal chamber 42 in the housing 40 to drive injection of the reducing agent into the exhaust passageway 16 .
- valves 34 , 36 may also be heated.
- Each of the valves 34 , 36 have electronic components (i.e. actuation coils) that may be damaged if heated above an allowable temperature.
- the cooling element 50 is in contact with the outlet valve 36 to cool the outlet valve 36 and prevent the electronic components of the valve 36 from overheating during use of the doser 28 .
- the cooling element 50 is a thermoelectric cooling element 50 that is configured to cool the outlet valve 36 when supplied electronic energy. Unlike coolant loops that may use fluid coolant from other cooling systems of the engine 12 , the thermoelectric cooling element 50 allows the cooling of the electric components of the doser 28 to be independently controlled from other components of the engine 12 or the system 14 .
- the control unit 54 is configured to selectively supply the thermoelectric cooling element 50 with power to control the cooling of the outlet valve 36 .
- the thermoelectric cooling element 50 therefore eliminates integrating the thermal management system 38 of the doser 28 with other cooling systems of the engine 12 .
- the thermoelectric cooling element 50 also minimizes the space that would otherwise be needed to integrate fluid base cooling into the doser 28 .
- the thermal management system 38 may include a first cooling element 50 and a second cooling element 52 as suggested in FIGS. 2 and 3 .
- the first cooling element 50 is in contact with an outer surface of the outlet valve 36 to cool the outlet valve 36 .
- the second cooling element 52 is in contact with an outer surface of the inlet valve 34 to cool the inlet valve 34 .
- the first cooling element 50 may be in contact with the inlet valve 34 and the outlet valve 36 to cool both the inlet and outlet valve 34 , 36 .
- the control unit 54 is coupled to the cooling elements 50 , 52 , the doser 28 , and the exhaust conduit 17 as shown in FIGS. 2 and 3 .
- the control unit 54 is configured to direct the thermoelectric cooling elements 50 , 52 to cool the respective valves 34 , 36 in response to at least one of (i) a temperature within the doser body 32 exceeding a predetermined agent value and (ii) a temperature of the exhaust gases in the exhaust passageway 16 exceeding a predetermined exhaust gas value.
- control unit 54 is configured to direct the thermoelectric cooling elements 50 , 52 to cool the valves 34 , 36 in response to the temperature within the doser body 32 exceeding the predetermined agent value.
- the components of the doser 28 may also be heated by the flow of exhaust gases in the exhaust passageway 16 .
- the exhaust gases in the exhaust passageway 16 may convectively heat the doser 28 .
- the control unit 54 may also be configured to direct the thermoelectric cooling elements 50 , 52 to cool the valves 34 , 36 in response to the temperature of the exhaust gases in the exhaust passageway 16 exceeding the predetermined exhaust gas value.
- Other conditions that produce high temperatures within the aftertreatment system 14 may include high engine loads, hot shutdown of the engine 12 , and regeneration of the diesel particulate filter 20 .
- High engine loads or high power density of the engine 12 may expose the doser 28 to high temperatures of around 650 degree Celsius.
- the diesel particular filter 20 is coupled to the exhaust passageway 16 upstream or downstream of the doser 28 . As such, regeneration of the diesel particulate filter 20 may also expose the doser 28 to high temperatures of around 150 degrees Celsius.
- the control unit 54 may also be coupled to the engine 12 and configured to direct the cooling elements 50 , 52 to selectively cool the valves 34 , 36 in response to a temperature of the internal combustion engine 12 exceeding an engine value.
- the control unit 54 may also be configured to direct the cooling elements 50 , 52 to cool the valves 34 , 36 in response to a signal that the doser 28 is not injecting the reducing agent and a signal that the engine 12 is running.
- the control unit 54 may also be configured to direct the cooling elements 50 , 52 to cool the valves 34 , 36 in response to a hot engine shut down signal.
- the hot engine shut down signal received by the control unit 54 indicates that the engine 12 has been shut off, but the temperature of the engine 12 remains above the predetermined engine value.
- the control unit 54 may also be coupled to the diesel particulate filter 20 and configured to direct the cooling elements 50 , 52 to selectively cool the valves 34 , 36 in response to the regeneration of the diesel particulate filter 20 .
- the control unit 54 may also be configured to direct the cooling elements 50 , 52 to selectively cool the valves 34 , 36 in response to a temperature of the diesel particulate filter 20 exceeding a predetermined filter temperature value.
- the control unit 54 may include a plurality of sensors 56 , 58 , 60 , 62 and a controller 64 as suggested in FIGS. 2 and 3 .
- the plurality of sensors 56 , 58 , 60 , 62 are coupled to different parts of the aftertreament system 14 or the engine 12 to measure temperatures within the system 14 and the engine 12 .
- the controller 64 is coupled to each of the sensors 56 , 58 , 60 , 62 , the heater 48 , and the thermoelectric cooling elements 50 , 52 to control the heater 48 and the thermoelectric cooling elements 50 , 52 based on information measured by the sensors 56 , 58 , 60 , 62 .
- the plurality of sensors 56 , 58 , 60 may include a first sensor 56 coupled to the doser 28 , a second sensor 58 coupled to the exhaust passageway 16 , a third sensor 60 coupled to the engine 12 , and a fourth sensor 62 coupled to the diesel particulate filter 20 .
- the first sensor 56 is configured to measure the temperature of the reducing agent in the doser 28 .
- the second sensor 58 is configured to measure the temperature of the exhaust gases in the exhaust passageway 16 .
- the third sensor 60 is configured to measure the temperature of the engine 12 .
- the fourth sensor 62 is configured to measure the temperature in the diesel particulate filter 20 .
- the first sensor 56 may be a virtual temperature sensor 56 .
- the control unit 54 may be configured to determine a virtual temperature of the reducing agent in the doser 28 .
- the control unit 54 may be configured to determine the virtual temperature of the reducing agent based on measured input parameters outside the doser 28 so as to provide the virtual reagent temperature sensor 56 .
- Such a virtual reagent temperature sensor is discussed more in-depth in U.S. Utility patent application Ser. No. 16/711,729 filed Dec. 12, 2019. The disclosure of which is expressly incorporated by reference herein.
- the controller 64 is configured to direct the cooling element 50 , 52 to cool the respective valve 34 , 36 in response to the temperature measured by the first sensor 56 being above the predetermined agent temperature value.
- the controller 64 is also configured to direct the cooling element 50 , 52 to cool the respective valve 34 , 36 in response to the temperature measured by the second sensor 58 being above the predetermined exhaust gas temperature value.
- the controller 64 may also be configured to direct the cooling element 50 , 52 to cool the respective valve 34 , 36 in response to the temperature measured by the third sensor 60 being above a predetermined engine temperature value.
- the controller 64 may also be configured to direct the cooling elements 50 , 52 to cool the respective valve 34 , 36 in response to the temperature measured by the fourth sensor 62 being above the predetermined filter temperature value.
- the controller 64 may be coupled to the engine 12 and the diesel particulate filter 20 as shown in FIGS. 2 and 3 .
- the controller 64 may also be configured to direct the cooling elements 50 , 52 to cool the valves 34 , 36 in response to a signal that the doser 28 is not injecting the reducing agent and a signal that the engine 12 is running.
- the controller 64 may also be configured to direct the cooling elements 50 , 52 to cool the valves 34 , 36 in response to the controller 64 receiving a hot engine shut down signal.
- the hot engine shut down signal received by the controller 64 indicates that the engine 12 has been shut off, but the temperature of the engine 12 remains above the predetermined engine temperature value.
- the controller 64 may also be configured to direct the at least one cooling element 50 , 52 to cool the valves 34 , 36 in response to the controller 64 receiving a regeneration signal from the diesel particulate filter 20 .
- the regeneration signal received by the controller 64 indicates that the regeneration of the diesel particulate filter 20 has begun or is occurring.
- the controller 64 is also configured to vary the electrical energy supplied to the thermoelectric cooling elements 50 , 52 to control the level of cooling of the valves 34 , 36 . To increase cooling of the valves 34 , 36 , the controller 64 increases the electrical energy supplied to the thermoelectric cooling elements 50 , 52 . Conversely, the controller 64 decreases the electrical energy suppled to the thermoelectric cooling elements 50 , 52 to decrease the cooling of the valves 34 , 36 .
- the cooling of the outlet valve 36 is independent of the inlet valve 34 .
- the controller 64 is configured to supply a different amount of electrical energy to the thermoelectric cooling element 50 than the amount of electric energy supplied to the thermoelectric cooling element 52 .
- control unit 54 may further include a power source 66 as suggested in FIG. 3 .
- the power source 66 may be coupled to the controller 64 and configured to supply the electrical energy to the thermoelectric cooling elements 50 , 52 .
- the thermoelectric cooling elements 50 , 52 may be supplied electric energy from other power source in the engine 12 or the aftertreatment system 14 .
- a method to control the thermal management system 38 of the doser 28 is also provided in this application.
- the thermal management system 38 of the doser 28 determines when the reducing agent should be heated, when the components of the doser 28 should be cooled.
- the need to maintain sufficient heating of the reducing agent in the doser 28 is desired in many implementations to maintain efficiency of the doser 28 during cold start and extended low load/low duty cycles.
- the need to manage the temperature of the electronic components in the doser 28 is desired in many implementations to maintain the integrity of the electronic components during use of the doser 28 .
- a control algorithm will use exhaust flow, exhaust temperature, and/or stored energy levels—among other things—to determine when to heat or cool the doser 28 .
- the present disclosure relates to thermal protection the electric components of a doser 28 adapted for dosing reducing agent into exhaust gases under high temperature operating conditions.
- the thermoelectric cooling elements 50 , 52 are used to provide electrically powered cooling of the actuator coils in the valves 34 , 36 .
- the thermoelectric cooling elements 50 , 52 are controlled based on temperatures measured within the doser 28 .
- thermoelectric cooling elements 50 , 52 may eliminate other coolant loops, saving coolant integration with the engine 12 .
- the thermoelectric cooling elements 50 , 52 may also minimize the space need in the doser 28 compared to fluid based cooling elements.
- Thermoelectric cooling elements 50 , 52 use thermoelectric materials that generate a hot side and a cold side when a voltage is applied to the material.
- the hot and cold side of the thermoelectric material promote heat transfer.
- thermoelectric cooling elements 50 , 52 may be controlled by a doser control unit 54 .
- the control unit 54 detects the high temperatures and activates the thermoelectric cooling elements 50 , 52 .
- a doser adapted for use in an exhaust aftertreatment system to inject a reducing agent into an exhaust passageway of the exhaust aftertreatment system, the doser comprising
- a doser body including a housing that defines a internal chamber, an inlet passageway that opens into the internal chamber to admit reducing agent from an associated reducing agent tank, and an outlet passageway that opens from the internal chamber into the exhaust passageway,
- valves including an inlet valve configured to selectively allow or block a flow of reducing agent through the inlet passageway into the housing and an outlet valve configured to selectively allow or block a flow of reducing agent through the outlet passageway into the exhaust passageway, and
- a thermal management system including a heater configured to selectively heat reducing agent in the internal chamber of the housing before injection of the reducing agent into the exhaust passageway and at least one cooling element coupled to at least one electronic component included in the doser to cool the at least one electronic component so as to prevent the at least one electronic component from overheating during operation of the doser in the exhaust aftertreatment system.
- thermoelectric cooling element configured to cool the at least one electronic component when supplied electronic energy.
- Clause 3 The doser of clause 2, any other suitable clause, or any combination of clauses, wherein the at least one electronic component is the outlet valve and the cooling element is in contact with the outlet valve to cool the outlet valve.
- Clause 4 The doser of clause 2, any other suitable clause, or any combination of clauses, wherein the at least one electronic component is either the inlet valve or the outlet valve and the cooling element is in contact with the inlet valve or the outlet valve to cool the inlet valve or the outlet valve.
- thermo management system includes two electronic components, the two electronic components are the inlet valve and the outlet valve, and the at least one cooling element is in contact with the inlet valve and the outlet valve to cool the inlet valve and the outlet valve.
- thermo management system further includes a control unit coupled to the cooling element.
- Clause 7 The doser of clause 6, any other suitable clause, or any combination of clauses, wherein the control unit is configured to direct the thermoelectric cooling element to cool the outlet valve in response to at least one of (i) a temperature within the doser body exceeding a predetermined agent temperature value and (ii) a temperature of the exhaust gases in the exhaust passageway exceeding a predetermined exhaust gas temperature value.
- control unit includes a temperature sensor configured to measure a temperature of the reducing agent in doser body and a controller coupled to the cooling element and the temperature sensor, and wherein the controller is configured to direct the cooling element to cool the outlet valve in response to the temperature measured by the temperature sensor being above the predetermined agent temperature value.
- control unit includes a temperature sensor configured to measure a temperature of the exhaust gases in the exhaust passageway and a controller coupled to the cooling element and temperature sensor.
- Clause 10 The doser of clause 9, any other suitable clause, or any combination of clauses, and wherein the controller is configured to direct the cooling element to cool the outlet valve in response to the temperature measured by the temperature sensor being above the predetermined exhaust gas value.
- Clause 11 The doser of clause 2, any other suitable clause, or any combination of clauses, wherein the at least one electronic component is the inlet valve and the cooling element is in contact with the inlet valve to cool the inlet valve.
- thermo management system includes a first cooling element in contact with the outlet valve to cool the outlet valve and a second cooling element in contact with the inlet valve to cool the inlet valve.
- thermo management system further includes a control unit coupled to the first and second cooling elements and the doser.
- Clause 14 The doser of clause 13, any other suitable clause, or any combination of clauses, wherein the control unit is configured to direct each of the first and second cooling elements to selectively cool the respective electronic component to control the temperature of the electronic component included in the doser in response to at least one of (i) a temperature within the doser body exceeding a predetermined agent temperature value and (ii) a temperature of the exhaust gases in the exhaust passageway exceeding a predetermined exhaust gas temperature value.
- An exhaust aftertreatment system for dosing reducing agent into a flow of exhaust gases to reduce nitrous oxides in the flow of exhaust gases comprising
- an exhaust conduit defining an exhaust passageway for receiving the flow of exhaust gases therein
- a reducing agent mixer fluidly coupled with the exhaust conduit and configured to receive the flow of exhaust gases and inject the reducing agent into the flow of exhaust gases.
- Clause 16 The system of clause 15, any other suitable clause, or any combination of clauses, wherein the reducing gent mixer includes a mixing can defining at least a portion of the exhaust passageway for receiving the flow of exhaust gases therein and a doser mounted to the mixing can and configured to inject the reducing agent into the exhaust passageway of the exhaust aftertreatment system.
- the doser comprises (i) a doser body including a housing that defines a internal chamber, an inlet passageway that opens into the internal chamber to admit reducing agent from an associated reducing agent tank, and an outlet passageway that opens from the internal chamber into the exhaust passageway, (ii) a plurality of valves including an inlet valve configured to selectively allow or block a flow of reducing agent through the inlet passageway into the housing and an outlet valve configured to selectively allow or block a flow of reducing agent through the outlet passageway into the exhaust passageway, and (iii) a thermal management system including a heater configured to selectively heat reducing agent in the internal chamber of the housing before injection of the reducing agent into the exhaust passageway and at least one cooling element coupled to at least one electronic component included in the doser to cool the at least one electric component so as to prevent the at least one electronic component from overheating during operation of the doser in the exhaust aftertreatment system.
- a doser body including a housing that defines a internal chamber, an inlet passage
- thermo management system further includes a control unit coupled to the at least one cooling element and the doser.
- control unit is configured to direct the cooling element to selectively cool the at least one electronic component in response to at least one of (i) a temperature within the doser body exceeding a predetermined agent temperature value and (ii) a temperature of the exhaust gases in the exhaust passageway exceeding a predetermined exhaust gas temperature value.
- Clause 20 The system of clause 19, any other suitable clause, or any combination of clauses, further comprising a diesel particular filer fluidly coupled to the exhaust passageway.
- Clause 21 The system of clause 20, any other suitable clause, or any combination of clauses, wherein the control unit is coupled to the diesel particulate filter and configured to direct the at least one cooling element to selectively cool the at least one electronic component in response to a temperature of the diesel particulate filter exceeding a predetermined filter temperature value.
- an internal combustion engine configured to produce a flow of exhaust gases that are conducted through an exhaust passageway defined by an exhaust conduit
- an exhaust aftertreatment system comprising
- a mixing can defining at least a portion of the exhaust passageway for receiving the flow of exhaust gases therein, and
- a doser mounted to the mixing can and configured to inject the reducing agent into the exhaust passageway of the exhaust aftertreatment system.
- the doser comprises (i) a doser body including a housing that defines a internal chamber, an inlet passageway that opens into the internal chamber to admit reducing agent from an associated reducing agent tank, and an outlet passageway that opens from the internal chamber into the exhaust passageway, (ii) a plurality of valves including an inlet valve configured to selectively allow or block a flow of reducing agent through the inlet passageway into the housing and an outlet valve configured to selectively allow or block a flow of reducing agent through the outlet passageway into the exhaust passageway, and (iii) a thermal management system including a heater configured to selectively heat reducing agent in the internal chamber of the housing before injection of the reducing agent into the exhaust passageway and at least one cooling element coupled to at least one electric component included in the doser to cool the at least one electric component so as to prevent the at least one electronic component from overheating during operation of the doser in the exhaust aftertreatment system.
- a doser body including a housing that defines a internal chamber, an inlet passage
- thermo management system further includes a control unit coupled to the at least one cooling element and the doser, and wherein the control unit is configured to direct the cooling element to selectively cool the at least one electronic component in response to a temperature of the internal combustion engine exceeding an engine temperature value.
- Clause 25 The vehicle of clause 24, any other suitable clause, or any combination of clauses, wherein the exhaust aftertreatment system further comprises a diesel particular filer fluidly coupled to the exhaust passageway.
- Clause 26 The vehicle of clause 25, any other suitable clause, or any combination of clauses, wherein the control unit is coupled to the diesel particulate filter and configured to direct the at least one cooling element to selectively cool the at least one electronic component in response to a temperature of the diesel particulate filter exceeding a predetermined filter temperature value.
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Abstract
An exhaust aftertreatment system for use with an over-the-road vehicle is disclosed. The exhaust aftertreatment system includes a flash-boil doser mounted to an exhaust conduit and a catalyst coupled to the exhaust conduit. The flash-boil doser configured to inject heated and pressurized reducing agent into an exhaust passageway defined by the exhaust conduit for distribution throughout exhaust gases passed through the exhaust conduit. The catalyst configured to react the reducing agent with the nitrous oxide in the flow of exhaust gases to provide treated exhaust gases with a reduced nitrous oxide amount.
Description
- The present disclosure relates to exhaust aftertreatment systems for automotive applications, and particularly to the incorporation of reagent dosers into such systems.
- An automotive exhaust aftertreatment system for dosing reducing agent into a flow of exhaust gases to reduce nitrous oxides in the flow of exhaust gases is described in this paper. The exhaust aftertreatment system includes an exhaust conduit and a reducing agent mixer having a mixing can and a doser mounted to the mixing can. The mixer is configured to mix a reducing agent injected by the doser with exhaust gas moving through the system. The mixing of the reducing agent with exhaust gas is designed to cause a chemical reaction and reduce Nitrous Oxides (NOx) in the exhaust gas when reacted by the catalyst.
- In the illustrative embodiments, the doser includes a doser body, plurality of valves, and a thermal management system. The doser body includes a housing that defines an internal chamber, an inlet passageway that opens into the internal chamber to admit reducing agent from an associated reducing agent tank, and an outlet passageway that opens from the internal chamber into the exhaust passageway. The plurality of valves includes an inlet valve and an outlet valve that are configured to selectively allow or block flow of reducing agent through the respective inlet or outlet passageway. The thermal management system is configure to manage the temperature of the components in the doser.
- In illustrative embodiments, the thermal management system includes a heater and at least one cooling element. The heater is configured to selectively heat reducing agent in the internal chamber of the housing before injection of the reducing agent into the exhaust passageway. Heating the reducing agent prior to injection into the exhaust passageway encourages reaction with the exhaust gases to improve reduction of NOx in the exhaust gases. The cooling element is coupled to at least one electronic component included in the doser to cool the at least one electric component so as to prevent the at least one electronic component from overheating during operation of the doser in the exhaust aftertreatment system.
- Additional features of the present disclosure will become apparent to those skilled in the art upon consideration of illustrative embodiments exemplifying the best mode of carrying out the disclosure as presently perceived.
- The detailed description particularly refers to the accompanying figures in which:
-
FIG. 1 is perspective view of an over-the-road automotive vehicle including an internal combustion engine and an exhaust aftertreatment system with a doser configured to deliver a reducing agent into engine exhaust gases flowing through an exhaust passageway define by an exhaust conduit; -
FIG. 2 is a diagrammatic view of the exhaust aftertreatment system included in the over-the-road vehicle ofFIG. 1 showing that the doser includes a doser body that includes inlet and outlet passageway to admit reducing agent into the doser, a plurality of valves to control the flow through the inlet and outlet passageway, and a thermal management system configured to control the temperature of the components included in the doser; -
FIG. 3 is a detail diagrammatic view of the doser included in the system ofFIG. 2 showing the thermal management system of the doser includes a heater arranged in the doser body to selectively heat reducing agent before injection of the reducing agent into the exhaust passageway and cooling elements coupled to the valves to cool the electronic components of the valves so as to prevent the valves from overheating during operation of the doser in the exhaust aftertreatment system; and -
FIG. 4 is a side elevation view of the exhaust aftertreatment system included in the over-the-road vehicle ofFIG. 1 showing the doser mounted to a mixer can located downstream of a diesel particulate filter included in the exhaust aftertreatment system. - For the purposes of promoting an understanding of the principles of the disclosure, reference will now be made to a number of illustrative embodiments illustrated in the drawings and specific language will be used to describe the same.
- An illustrative over-the-road vehicle 10 includes an
engine 12 and anexhaust aftertreatment system 14 in accordance with the present disclosure is shown, for example, inFIG. 1 . Theengine 12 is, illustratively, aninternal combustion engine 12 configured to combust fuel and discharge exhaust gases that are carried through anexhaust passageway 16 defined by anexhaust conduit 17, treated by theexhaust aftertreatment system 14, and then released into the atmosphere. Theexhaust aftertreatment system 14 is configured to reduce various effluents in the exhaust gases, such as, for example, nitrogen oxides (NOx), before the exhaust gases are released to the atmosphere. - In the illustrative embodiment, the
exhaust aftertreatment system 14 includes a plurality of exhaust aftertreatment devices such as, for example, a diesel oxidation catalyst (DOC) 18, a diesel particulate filter (DPF) 20, and a selective catalytic reduction unit (SCR) 22, and a reducingagent mixer 24. The exhaust gases pass through or by each of the aftertreatment devices to remove or reduce different effluents. The reducingagent mixer 24 is mounted upstream of theSCR 22 and is configured to inject and mix a reducing agent, illustratively a urea solution, into the exhaust gases. Chemical reaction of the reducing agent with the exhaust gases occurs in downstream of the reducingagent mixer 24 in theSCR 22 to reduce NOx to produce treated exhaust gases before being released in the atmosphere. - The reducing
agent mixer 24 includes a mixing can 26 and adoser 28 as shown inFIGS. 1 and 2 . The mixing can 26 is coupled fluidly with theexhaust passageway 16 to receive the exhaust gases flowing therethrough. The reducing agent is stored on the vehicle 10 in a reducingagent tank 30 and is conducted to thedoser 28 to be injected into the mixing can 26. - The
doser 28 includes adoser body 32, a plurality ofvalves thermal management system 38 as shown inFIGS. 2 and 3 . Thedoser body 32 includes ahousing 40 that defines aninternal chamber 42, aninlet passageway 44, and anoutlet passageway 46. Theinlet passageway 44 opens into theinternal chamber 42 to admit reducing agent from the reducingagent tank 30, while theoutlet passageway 46 opens from theinternal chamber 42 into theexhaust passageway 16 of theexhaust aftertreatment system 14. Thevalves inlet valve 34 that selectively allows or blocks a flow of reducing agent through theinlet passageway 44 into theinternal chamber 42 and anoutlet valve 36 that selectively allows or blocks a flow of reducing agent through theoutlet passageway 46 into theexhaust passageway 16. Thethermal management system 38 is configured to manage the temperature of the components included in thedoser 28. - The
thermal management system 38 includes aheater 48, at least onecooling element 50 and acontrol unit 54 as shown inFIGS. 2 and 3 . Theheater 48 is configured to selectively heat reducing agent in theinternal chamber 42 of thehousing 40 before injection of the reducing agent into theexhaust passageway 16. Thecooling element 50 is coupled to at least one electronic component included in thedoser 28 to cool the at least one electric component so as to prevent the at least one electronic component from overheating during operation of thedoser 28 in theexhaust aftertreatment system 14. Thecontrol unit 54 is configured to direct theheater 48 to selectively apply heat and thecooling element 50 to selectively cool the components in thedoser 28. - In some embodiments, the
doser 28 may be a flash-boil doser 28. Theheater 48 may be configured to heat the reducing agent in theinternal chamber 42 and thereby increase a pressure within theinternal chamber 42 in thehousing 40 to drive injection of the reducing agent into theexhaust passageway 16. - As the
heater 48 increases the temperature of the reducing agent within theinternal chamber 42, other components of thedoser 28, such as thevalves valves cooling element 50 is in contact with theoutlet valve 36 to cool theoutlet valve 36 and prevent the electronic components of thevalve 36 from overheating during use of thedoser 28. - In the illustrative embodiment, the
cooling element 50 is athermoelectric cooling element 50 that is configured to cool theoutlet valve 36 when supplied electronic energy. Unlike coolant loops that may use fluid coolant from other cooling systems of theengine 12, thethermoelectric cooling element 50 allows the cooling of the electric components of thedoser 28 to be independently controlled from other components of theengine 12 or thesystem 14. - The
control unit 54 is configured to selectively supply thethermoelectric cooling element 50 with power to control the cooling of theoutlet valve 36. Thethermoelectric cooling element 50 therefore eliminates integrating thethermal management system 38 of thedoser 28 with other cooling systems of theengine 12. Thethermoelectric cooling element 50 also minimizes the space that would otherwise be needed to integrate fluid base cooling into thedoser 28. - In some embodiments, the
thermal management system 38 may include afirst cooling element 50 and asecond cooling element 52 as suggested inFIGS. 2 and 3 . Thefirst cooling element 50 is in contact with an outer surface of theoutlet valve 36 to cool theoutlet valve 36. Thesecond cooling element 52 is in contact with an outer surface of theinlet valve 34 to cool theinlet valve 34. In other embodiments, thefirst cooling element 50 may be in contact with theinlet valve 34 and theoutlet valve 36 to cool both the inlet andoutlet valve - The
control unit 54 is coupled to thecooling elements doser 28, and theexhaust conduit 17 as shown inFIGS. 2 and 3 . Thecontrol unit 54 is configured to direct thethermoelectric cooling elements respective valves doser body 32 exceeding a predetermined agent value and (ii) a temperature of the exhaust gases in theexhaust passageway 16 exceeding a predetermined exhaust gas value. - As the
heater 48 heats the reducing agent in theinternal chamber 42, temperature of theoutlet valve 36 and/or theinlet valve 34 may increase through conductive heating. To ensure the electronic components of thevalves control unit 54 is configured to direct thethermoelectric cooling elements valves doser body 32 exceeding the predetermined agent value. - The components of the
doser 28 may also be heated by the flow of exhaust gases in theexhaust passageway 16. As thedoser 28 is mounted to the mixing can 26, the exhaust gases in theexhaust passageway 16 may convectively heat thedoser 28. At high duty cycles, the temperature of the exhaust gases are high and may overheat the electronic components of thedoser 28. As such, thecontrol unit 54 may also be configured to direct thethermoelectric cooling elements valves exhaust passageway 16 exceeding the predetermined exhaust gas value. - Other conditions that produce high temperatures within the
aftertreatment system 14 may include high engine loads, hot shutdown of theengine 12, and regeneration of thediesel particulate filter 20. High engine loads or high power density of theengine 12 may expose thedoser 28 to high temperatures of around 650 degree Celsius. The dieselparticular filter 20 is coupled to theexhaust passageway 16 upstream or downstream of thedoser 28. As such, regeneration of thediesel particulate filter 20 may also expose thedoser 28 to high temperatures of around 150 degrees Celsius. - The
control unit 54 may also be coupled to theengine 12 and configured to direct thecooling elements valves internal combustion engine 12 exceeding an engine value. Thecontrol unit 54 may also be configured to direct thecooling elements valves doser 28 is not injecting the reducing agent and a signal that theengine 12 is running. - The
control unit 54 may also be configured to direct thecooling elements valves control unit 54 indicates that theengine 12 has been shut off, but the temperature of theengine 12 remains above the predetermined engine value. - The
control unit 54 may also be coupled to thediesel particulate filter 20 and configured to direct thecooling elements valves diesel particulate filter 20. Thecontrol unit 54 may also be configured to direct thecooling elements valves diesel particulate filter 20 exceeding a predetermined filter temperature value. - The
control unit 54 may include a plurality ofsensors controller 64 as suggested inFIGS. 2 and 3 . The plurality ofsensors aftertreament system 14 or theengine 12 to measure temperatures within thesystem 14 and theengine 12. Thecontroller 64 is coupled to each of thesensors heater 48, and thethermoelectric cooling elements heater 48 and thethermoelectric cooling elements sensors - The plurality of
sensors first sensor 56 coupled to thedoser 28, asecond sensor 58 coupled to theexhaust passageway 16, athird sensor 60 coupled to theengine 12, and afourth sensor 62 coupled to thediesel particulate filter 20. Thefirst sensor 56 is configured to measure the temperature of the reducing agent in thedoser 28. Thesecond sensor 58 is configured to measure the temperature of the exhaust gases in theexhaust passageway 16. Thethird sensor 60 is configured to measure the temperature of theengine 12. Thefourth sensor 62 is configured to measure the temperature in thediesel particulate filter 20. - In other embodiments, the
first sensor 56 may be avirtual temperature sensor 56. Thecontrol unit 54 may be configured to determine a virtual temperature of the reducing agent in thedoser 28. Thecontrol unit 54 may be configured to determine the virtual temperature of the reducing agent based on measured input parameters outside thedoser 28 so as to provide the virtualreagent temperature sensor 56. Such a virtual reagent temperature sensor is discussed more in-depth in U.S. Utility patent application Ser. No. 16/711,729 filed Dec. 12, 2019. The disclosure of which is expressly incorporated by reference herein. - The
controller 64 is configured to direct thecooling element respective valve first sensor 56 being above the predetermined agent temperature value. Thecontroller 64 is also configured to direct thecooling element respective valve second sensor 58 being above the predetermined exhaust gas temperature value. - The
controller 64 may also be configured to direct thecooling element respective valve third sensor 60 being above a predetermined engine temperature value. Thecontroller 64 may also be configured to direct thecooling elements respective valve fourth sensor 62 being above the predetermined filter temperature value. - The
controller 64 may be coupled to theengine 12 and thediesel particulate filter 20 as shown inFIGS. 2 and 3 . Thecontroller 64 may also be configured to direct thecooling elements valves doser 28 is not injecting the reducing agent and a signal that theengine 12 is running. - The
controller 64 may also be configured to direct thecooling elements valves controller 64 receiving a hot engine shut down signal. The hot engine shut down signal received by thecontroller 64 indicates that theengine 12 has been shut off, but the temperature of theengine 12 remains above the predetermined engine temperature value. - The
controller 64 may also be configured to direct the at least onecooling element valves controller 64 receiving a regeneration signal from thediesel particulate filter 20. The regeneration signal received by thecontroller 64 indicates that the regeneration of thediesel particulate filter 20 has begun or is occurring. - The
controller 64 is also configured to vary the electrical energy supplied to thethermoelectric cooling elements valves valves controller 64 increases the electrical energy supplied to thethermoelectric cooling elements controller 64 decreases the electrical energy suppled to thethermoelectric cooling elements valves - In the illustrative embodiments, the cooling of the
outlet valve 36 is independent of theinlet valve 34. Thecontroller 64 is configured to supply a different amount of electrical energy to thethermoelectric cooling element 50 than the amount of electric energy supplied to thethermoelectric cooling element 52. - In some embodiments, the
control unit 54 may further include apower source 66 as suggested inFIG. 3 . Thepower source 66 may be coupled to thecontroller 64 and configured to supply the electrical energy to thethermoelectric cooling elements thermoelectric cooling elements engine 12 or theaftertreatment system 14. - A method to control the
thermal management system 38 of thedoser 28 is also provided in this application. Thethermal management system 38 of thedoser 28 determines when the reducing agent should be heated, when the components of thedoser 28 should be cooled. The need to maintain sufficient heating of the reducing agent in thedoser 28 is desired in many implementations to maintain efficiency of thedoser 28 during cold start and extended low load/low duty cycles. However, the need to manage the temperature of the electronic components in thedoser 28 is desired in many implementations to maintain the integrity of the electronic components during use of thedoser 28. A control algorithm will use exhaust flow, exhaust temperature, and/or stored energy levels—among other things—to determine when to heat or cool thedoser 28. - The present disclosure relates to thermal protection the electric components of a
doser 28 adapted for dosing reducing agent into exhaust gases under high temperature operating conditions. Thethermoelectric cooling elements valves thermoelectric cooling elements doser 28. - The
thermoelectric cooling elements engine 12. Thethermoelectric cooling elements doser 28 compared to fluid based cooling elements. -
Thermoelectric cooling elements - The power and control of the
thermoelectric cooling elements doser control unit 54. Under conditions of high temperature exhaust gas and/or hot engine shut down, thecontrol unit 54 detects the high temperatures and activates thethermoelectric cooling elements - The following numbered clauses include embodiments that are contemplated and non-limiting:
- Clause 1. A doser adapted for use in an exhaust aftertreatment system to inject a reducing agent into an exhaust passageway of the exhaust aftertreatment system, the doser comprising
- a doser body including a housing that defines a internal chamber, an inlet passageway that opens into the internal chamber to admit reducing agent from an associated reducing agent tank, and an outlet passageway that opens from the internal chamber into the exhaust passageway,
- a plurality of valves including an inlet valve configured to selectively allow or block a flow of reducing agent through the inlet passageway into the housing and an outlet valve configured to selectively allow or block a flow of reducing agent through the outlet passageway into the exhaust passageway, and
- a thermal management system including a heater configured to selectively heat reducing agent in the internal chamber of the housing before injection of the reducing agent into the exhaust passageway and at least one cooling element coupled to at least one electronic component included in the doser to cool the at least one electronic component so as to prevent the at least one electronic component from overheating during operation of the doser in the exhaust aftertreatment system.
- Clause 2. The doser of clause 1, any other suitable clause, or any combination of clauses, wherein the cooling element is a thermoelectric cooling element configured to cool the at least one electronic component when supplied electronic energy.
- Clause 3. The doser of clause 2, any other suitable clause, or any combination of clauses, wherein the at least one electronic component is the outlet valve and the cooling element is in contact with the outlet valve to cool the outlet valve.
- Clause 4. The doser of clause 2, any other suitable clause, or any combination of clauses, wherein the at least one electronic component is either the inlet valve or the outlet valve and the cooling element is in contact with the inlet valve or the outlet valve to cool the inlet valve or the outlet valve.
- Clause 5. The doser of clause 4, any other suitable clause, or any combination of clauses, wherein the thermal management system includes two electronic components, the two electronic components are the inlet valve and the outlet valve, and the at least one cooling element is in contact with the inlet valve and the outlet valve to cool the inlet valve and the outlet valve.
- Clause 6. The doser of clause 5, any other suitable clause, or any combination of clauses, wherein the thermal management system further includes a control unit coupled to the cooling element.
- Clause 7. The doser of clause 6, any other suitable clause, or any combination of clauses, wherein the control unit is configured to direct the thermoelectric cooling element to cool the outlet valve in response to at least one of (i) a temperature within the doser body exceeding a predetermined agent temperature value and (ii) a temperature of the exhaust gases in the exhaust passageway exceeding a predetermined exhaust gas temperature value.
- Clause 8. The doser of clause 7, any other suitable clause, or any combination of clauses, wherein the control unit includes a temperature sensor configured to measure a temperature of the reducing agent in doser body and a controller coupled to the cooling element and the temperature sensor, and wherein the controller is configured to direct the cooling element to cool the outlet valve in response to the temperature measured by the temperature sensor being above the predetermined agent temperature value.
- Clause 9. The doser of clause 7, any other suitable clause, or any combination of clauses, wherein the control unit includes a temperature sensor configured to measure a temperature of the exhaust gases in the exhaust passageway and a controller coupled to the cooling element and temperature sensor.
- Clause 10. The doser of clause 9, any other suitable clause, or any combination of clauses, and wherein the controller is configured to direct the cooling element to cool the outlet valve in response to the temperature measured by the temperature sensor being above the predetermined exhaust gas value.
- Clause 11. The doser of clause 2, any other suitable clause, or any combination of clauses, wherein the at least one electronic component is the inlet valve and the cooling element is in contact with the inlet valve to cool the inlet valve.
-
Clause 12. The doser of clause 1, any other suitable clause, or any combination of clauses, wherein the thermal management system includes a first cooling element in contact with the outlet valve to cool the outlet valve and a second cooling element in contact with the inlet valve to cool the inlet valve. - Clause 13. The doser of
clause 12, any other suitable clause, or any combination of clauses, wherein the thermal management system further includes a control unit coupled to the first and second cooling elements and the doser. -
Clause 14. The doser of clause 13, any other suitable clause, or any combination of clauses, wherein the control unit is configured to direct each of the first and second cooling elements to selectively cool the respective electronic component to control the temperature of the electronic component included in the doser in response to at least one of (i) a temperature within the doser body exceeding a predetermined agent temperature value and (ii) a temperature of the exhaust gases in the exhaust passageway exceeding a predetermined exhaust gas temperature value. - Clause 15. An exhaust aftertreatment system for dosing reducing agent into a flow of exhaust gases to reduce nitrous oxides in the flow of exhaust gases, the system comprising
- an exhaust conduit defining an exhaust passageway for receiving the flow of exhaust gases therein, and
- a reducing agent mixer fluidly coupled with the exhaust conduit and configured to receive the flow of exhaust gases and inject the reducing agent into the flow of exhaust gases.
-
Clause 16. The system of clause 15, any other suitable clause, or any combination of clauses, wherein the reducing gent mixer includes a mixing can defining at least a portion of the exhaust passageway for receiving the flow of exhaust gases therein and a doser mounted to the mixing can and configured to inject the reducing agent into the exhaust passageway of the exhaust aftertreatment system. -
Clause 17. The system ofclause 16, any other suitable clause, or any combination of clauses, wherein the doser comprises (i) a doser body including a housing that defines a internal chamber, an inlet passageway that opens into the internal chamber to admit reducing agent from an associated reducing agent tank, and an outlet passageway that opens from the internal chamber into the exhaust passageway, (ii) a plurality of valves including an inlet valve configured to selectively allow or block a flow of reducing agent through the inlet passageway into the housing and an outlet valve configured to selectively allow or block a flow of reducing agent through the outlet passageway into the exhaust passageway, and (iii) a thermal management system including a heater configured to selectively heat reducing agent in the internal chamber of the housing before injection of the reducing agent into the exhaust passageway and at least one cooling element coupled to at least one electronic component included in the doser to cool the at least one electric component so as to prevent the at least one electronic component from overheating during operation of the doser in the exhaust aftertreatment system. -
Clause 18. The system ofclause 17, any other suitable clause, or any combination of clauses, wherein the thermal management system further includes a control unit coupled to the at least one cooling element and the doser. - Clause 19. The system of
clause 18, any other suitable clause, or any combination of clauses, wherein the control unit is configured to direct the cooling element to selectively cool the at least one electronic component in response to at least one of (i) a temperature within the doser body exceeding a predetermined agent temperature value and (ii) a temperature of the exhaust gases in the exhaust passageway exceeding a predetermined exhaust gas temperature value. -
Clause 20. The system of clause 19, any other suitable clause, or any combination of clauses, further comprising a diesel particular filer fluidly coupled to the exhaust passageway. - Clause 21. The system of
clause 20, any other suitable clause, or any combination of clauses, wherein the control unit is coupled to the diesel particulate filter and configured to direct the at least one cooling element to selectively cool the at least one electronic component in response to a temperature of the diesel particulate filter exceeding a predetermined filter temperature value. -
Clause 22. An over the road vehicle, the vehicle comprising - an internal combustion engine configured to produce a flow of exhaust gases that are conducted through an exhaust passageway defined by an exhaust conduit, and
- an exhaust aftertreatment system comprising
- a mixing can defining at least a portion of the exhaust passageway for receiving the flow of exhaust gases therein, and
- a doser mounted to the mixing can and configured to inject the reducing agent into the exhaust passageway of the exhaust aftertreatment system.
- Clause 23. The vehicle of
clause 22, any other suitable clause, or any combination of clauses, wherein the doser comprises (i) a doser body including a housing that defines a internal chamber, an inlet passageway that opens into the internal chamber to admit reducing agent from an associated reducing agent tank, and an outlet passageway that opens from the internal chamber into the exhaust passageway, (ii) a plurality of valves including an inlet valve configured to selectively allow or block a flow of reducing agent through the inlet passageway into the housing and an outlet valve configured to selectively allow or block a flow of reducing agent through the outlet passageway into the exhaust passageway, and (iii) a thermal management system including a heater configured to selectively heat reducing agent in the internal chamber of the housing before injection of the reducing agent into the exhaust passageway and at least one cooling element coupled to at least one electric component included in the doser to cool the at least one electric component so as to prevent the at least one electronic component from overheating during operation of the doser in the exhaust aftertreatment system. -
Clause 24. The vehicle of clause 23, any other suitable clause, or any combination of clauses, wherein the thermal management system further includes a control unit coupled to the at least one cooling element and the doser, and wherein the control unit is configured to direct the cooling element to selectively cool the at least one electronic component in response to a temperature of the internal combustion engine exceeding an engine temperature value. - Clause 25. The vehicle of
clause 24, any other suitable clause, or any combination of clauses, wherein the exhaust aftertreatment system further comprises a diesel particular filer fluidly coupled to the exhaust passageway. -
Clause 26. The vehicle of clause 25, any other suitable clause, or any combination of clauses, wherein the control unit is coupled to the diesel particulate filter and configured to direct the at least one cooling element to selectively cool the at least one electronic component in response to a temperature of the diesel particulate filter exceeding a predetermined filter temperature value. - While the disclosure has been illustrated and described in detail in the foregoing drawings and description, the same is to be considered as exemplary and not restrictive in character, it being understood that only illustrative embodiments thereof have been shown and described and that all changes and modifications that come within the spirit of the disclosure are desired to be protected.
Claims (16)
1. A doser adapted for use in an exhaust aftertreatment system to inject a reducing agent into an exhaust passageway of the exhaust aftertreatment system, the doser comprising
a doser body including a housing that defines a internal chamber, an inlet passageway that opens into the internal chamber to admit reducing agent from an associated reducing agent tank, and an outlet passageway that opens from the internal chamber into the exhaust passageway,
a plurality of valves including an inlet valve configured to selectively allow or block a flow of reducing agent through the inlet passageway into the housing and an outlet valve configured to selectively allow or block the flow of reducing agent through the outlet passageway into the exhaust passageway, and
a thermal management system including a heater configured to selectively heat reducing agent in the internal chamber of the housing before injection of the reducing agent into the exhaust passageway and at least one cooling element coupled to at least one electronic component included in the doser to cool the at least one electronic component so as to prevent the at least one electronic component from overheating during operation of the doser in the exhaust aftertreatment system.
2. The doser of claim 1 , wherein the at least one cooling element is a thermoelectric cooling element configured to cool the at least one electronic component when supplied electronic energy.
3. The doser of claim 2 , wherein the at least one electronic component is either the inlet valve or the outlet valve and the at least one cooling element is in contact with the inlet valve or the outlet valve to cool the inlet valve or the outlet valve.
4. The doser of claim 3 , wherein the at least one electronic component includes two electronic components, the two electronic components are the inlet valve and the outlet valve, and the at least one cooling element is in contact with the inlet valve and the outlet valve to cool the inlet valve and the outlet valve.
5. The doser of claim 2 , wherein the thermal management system further includes a control unit coupled to the at least one cooling element, and wherein the control unit is configured to direct the thermoelectric cooling element to cool the outlet valve in response to at least one of (i) a temperature within the doser body exceeding a predetermined agent temperature value and (ii) a temperature of the exhaust gases in the exhaust passageway exceeding a predetermined exhaust gas temperature value.
6. The doser of claim 5 , wherein the control unit includes a temperature sensor configured to measure a temperature of the reducing agent in the doser body and a controller coupled to the at least one cooling element and the temperature sensor, and wherein the controller is configured to direct the at least one cooling element to cool the outlet valve in response to the temperature measured by the temperature sensor being above the predetermined agent temperature value.
7. The doser of claim 5 , wherein the control unit includes a temperature sensor configured to measure a temperature of the exhaust gases in the exhaust passageway and a controller coupled to the at least one cooling element and the temperature sensor, and wherein the controller is configured to direct the at least one cooling element to cool the outlet valve in response to the temperature measured by the temperature sensor being above the predetermined exhaust gas value.
8. The doser of claim 2 , wherein the at least one electronic component is the inlet valve and the at least one cooling element is in contact with the inlet valve to cool the inlet valve.
9. The doser of claim 1 , wherein the at least one electric component includes a first cooling element in contact with the outlet valve to cool the outlet valve and a second cooling element in contact with the inlet valve to cool the inlet valve.
10. The doser of claim 9 , wherein the thermal management system further includes a control unit coupled to the first and second cooling elements and the doser, and wherein the control unit is configured to direct each of the first and second cooling elements to selectively cool the respective electronic component to control a temperature of the respective electronic component included in the doser in response to at least one of (i) a temperature within the doser body exceeding a predetermined agent temperature value and (ii) a temperature of the exhaust gases in the exhaust passageway exceeding a predetermined exhaust gas temperature value.
11. An exhaust aftertreatment system for dosing reducing agent into a flow of exhaust gases to reduce nitrous oxides in the flow of exhaust gases, the system comprising
an exhaust conduit defining an exhaust passageway for receiving the flow of exhaust gases therein,
a reducing agent mixer fluidly coupled with the exhaust conduit and configured to receive the flow of exhaust gases and inject the reducing agent into the flow of exhaust gases, the reducing gent mixer including
a mixing can defining at least a portion of the exhaust passageway for receiving the flow of exhaust gases therein, and
a doser mounted to the mixing can and configured to inject the reducing agent into the exhaust passageway of the exhaust aftertreatment system, the doser comprising (i) a doser body including a housing that defines a internal chamber, an inlet passageway that opens into the internal chamber to admit the reducing agent from an associated reducing agent tank, and an outlet passageway that opens from the internal chamber into the exhaust passageway, (ii) a plurality of valves including an inlet valve configured to selectively allow or block a flow of reducing agent through the inlet passageway into the housing and an outlet valve configured to selectively allow or block the flow of reducing agent through the outlet passageway into the exhaust passageway, and (iii) a thermal management system including a heater configured to selectively heat reducing agent in the internal chamber of the housing before injection of the reducing agent into the exhaust passageway and at least one cooling element coupled to at least one electronic component included in the doser to cool the at least one electric component so as to prevent the at least one electronic component from overheating during operation of the doser in the exhaust aftertreatment system.
12. The system of claim 11 , wherein the thermal management system further includes a control unit coupled to the at least one cooling element and the doser, and wherein the control unit is configured to direct the at least one cooling element to selectively cool the at least one electronic component in response to at least one of (i) a temperature within the doser body exceeding a predetermined agent temperature value and (ii) a temperature of the exhaust gases in the exhaust passageway exceeding a predetermined exhaust gas temperature value.
13. The system of claim 12 , further comprising a diesel particulate filter fluidly coupled to the exhaust passageway, and wherein the control unit is coupled to the diesel particulate filter and configured to direct the at least one cooling element to selectively cool the at least one electronic component in response to a temperature of the diesel particulate filter exceeding a predetermined filter temperature value.
14. An over the road vehicle, the vehicle comprising
an internal combustion engine configured to produce a flow of exhaust gases that are conducted through an exhaust passageway defined by an exhaust conduit, and
an exhaust aftertreatment system comprising
a mixing can defining at least a portion of the exhaust passageway for receiving the flow of exhaust gases therein, and
a doser mounted to the mixing can and configured to inject a reducing agent into the exhaust passageway of the exhaust aftertreatment system, the doser comprising (i) a doser body including a housing that defines a internal chamber, an inlet passageway that opens into the internal chamber to admit reducing agent from an associated reducing agent tank, and an outlet passageway that opens from the internal chamber into the exhaust passageway, (ii) a plurality of valves including an inlet valve configured to selectively allow or block the flow of reducing agent through the inlet passageway into the housing and an outlet valve configured to selectively allow or block a flow of reducing agent through the outlet passageway into the exhaust passageway, and (iii) a thermal management system including a heater configured to selectively heat reducing agent in the internal chamber of the housing before injection of the reducing agent into the exhaust passageway and at least one cooling element coupled to at least one electric component included in the doser to cool the at least one electric component so as to prevent the at least one electronic component from overheating during operation of the doser in the exhaust aftertreatment system.
15. The vehicle of claim 14 , wherein the thermal management system further includes a control unit coupled to the at least one cooling element and the doser, and wherein the control unit is configured to direct the at least one cooling element to selectively cool the at least one electronic component in response to a temperature of the internal combustion engine exceeding an engine temperature value.
16. The vehicle of claim 15 , wherein the exhaust aftertreatment system further comprises a diesel particulate filter fluidly coupled to the exhaust passageway, and wherein the control unit is coupled to the diesel particulate filter and configured to direct the at least one cooling element to selectively cool the at least one electronic component in response to a temperature of the diesel particulate filter exceeding a predetermined filter temperature value.
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US16/916,725 US11225894B1 (en) | 2020-06-30 | 2020-06-30 | Exhaust aftertreatment system with thermally controlled reagent doser |
DE102021115808.7A DE102021115808A1 (en) | 2020-06-30 | 2021-06-18 | EXHAUST GAS AFTER-TREATMENT SYSTEM WITH THERMAL CONTROLLED REAGENT DOSER |
CN202110734992.0A CN113864029A (en) | 2020-06-30 | 2021-06-30 | Exhaust aftertreatment system with thermally controlled reagent doser |
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US16/916,725 US11225894B1 (en) | 2020-06-30 | 2020-06-30 | Exhaust aftertreatment system with thermally controlled reagent doser |
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US11225894B1 (en) | 2022-01-18 |
CN113864029A (en) | 2021-12-31 |
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