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WO2016082850A1 - Système de purification de gaz d'échappement de moteurs à combustion interne à recirculation de gaz d'échappement - Google Patents

Système de purification de gaz d'échappement de moteurs à combustion interne à recirculation de gaz d'échappement Download PDF

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Publication number
WO2016082850A1
WO2016082850A1 PCT/EP2014/003173 EP2014003173W WO2016082850A1 WO 2016082850 A1 WO2016082850 A1 WO 2016082850A1 EP 2014003173 W EP2014003173 W EP 2014003173W WO 2016082850 A1 WO2016082850 A1 WO 2016082850A1
Authority
WO
WIPO (PCT)
Prior art keywords
exhaust
location
passage
recirculating
exhaust gases
Prior art date
Application number
PCT/EP2014/003173
Other languages
English (en)
Inventor
Grzegorz SALAPA
Original Assignee
Volvo Truck Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Volvo Truck Corporation filed Critical Volvo Truck Corporation
Priority to PCT/EP2014/003173 priority Critical patent/WO2016082850A1/fr
Publication of WO2016082850A1 publication Critical patent/WO2016082850A1/fr

Links

Classifications

    • 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
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
    • 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
    • F01N3/031—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 having means for by-passing filters, e.g. when clogged or during cold engine start
    • 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
    • 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
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/08—Exhaust treating devices having provisions not otherwise provided for for preventing heat loss or temperature drop, using other means than layers of heat-insulating material
    • 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
    • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
    • F01N2410/03—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device in case of low temperature
    • 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
    • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
    • F01N2410/06—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device at cold starting
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • 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
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • F01N2900/1404—Exhaust gas temperature
    • 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
    • F01N3/2026—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means directly electrifying the catalyst substrate, i.e. heating the electrically conductive catalyst substrate by joule effect
    • 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
    • F01N3/2033—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using a fuel burner or introducing fuel into exhaust duct
    • 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
    • F01N3/2053—By-passing catalytic reactors, e.g. to prevent overheating
    • 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
    • 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
    • Y02T10/40—Engine management systems

Definitions

  • the invention relates to an exhaust assembly comprising a guiding arrangement adapted to receive exhaust gases from an internal combustion engine, and to guide the exhaust gases towards the atmosphere.
  • the invention also relates to an internal combustion engine system, a vehicle, a method, a computer program, a computer readable medium, and a controller.
  • an exhaust assembly comprising a guiding arrangement adapted to receive exhaust gases from an internal combustion engine, and to guide the exhaust gases towards the atmosphere, characterised in that it comprises a recirculating passage extending from a first location in the guiding arrangement to a second location in the guiding arrangement, the second location being upstream of the first location.
  • the exhaust assembly is preferably arranged to be installed such that the second location is at an exhaust side of the engine. It should be noted that the guiding arrangement could be adapted to receive the exhaust gases from the engine directly or indirectly, e.g. by
  • the guiding arrangement is adapted to release the exhaust gases towards the atmosphere, directly or indirectly, e.g. by communicating with an exhaust pipe communicating with the atmosphere.
  • exhaust gases can be transported from the first location back to the second location through the recirculating passage.
  • the invention provides beneficial possibilities.
  • the exhaust manipulating device is an exhaust after-treatment component adapted to provide an after-treatment of the exhaust gases
  • the invention makes it possible to improve temperature conditions of the exhaust after-treatment component.
  • the invention makes it possible to provide a more even temperature distribution in the exhaust after-treatment component.
  • the invention also makes it possible to increase the temperature of the component during conditions with cold exhaust gases.
  • the first location is downstream of the exhaust after-treatment
  • the recirculating passage can recirculate exhaust gases from the outlet of the component to the inlet of the component.
  • the component may be adapted to increase the temperature of relatively cool exhaust cases, e.g. at idling, low load or cold start situations.
  • SCR selective catalytic reactor
  • the recirculated exhaust gases from the outlet of the component to the inlet of the component will increase the temperature at the upstream end of the component, and this will reduce the temperature gradient through the component, thereby improving its functionality.
  • a low temperature gradient will assist in controlling the NH3 buffer and to limit NH3 slip.
  • the recirculation will also increase the average temperature of the exhaust after-treatment component, which again is beneficial at idling, low load or cold start situations. Increasing the temperature of the component during conditions with cold exhaust gases will improve the functionality of the component and decrease the dependency of the component of the operating condition of the engine.
  • the invention makes it possible to increase the mass flow through the component, which allows the mass flow of the engine to be kept low, e.g. at low load situations, while providing a high mass flow through the component, beneficial to the after-treatment process therein.
  • the invention provides the possibility of avoiding known energy consuming exhaust after- treatment system boosting solutions, such as engine heat modes, additional fuel burners, or electrically heated after-treatment systems, which increase engine fuel consumption.
  • known energy consuming exhaust after- treatment system boosting solutions such as engine heat modes, additional fuel burners, or electrically heated after-treatment systems, which increase engine fuel consumption.
  • little or no additional amount of energy is needed to obtain and preserve an efficient exhaust after-treatment during a variety of operating situations.
  • the fuel consumption of the engine can be decreased by avoiding known energy consuming exhaust after-treatment boosting strategies.
  • the invention can be used to "smooth out" exhaust temperature fluctuations in transient conditions. More specifically, this can be done by recirculating relatively hot gases exiting the exhaust after-treatment component back to the inlet of the component, thereby warming up a cool exhaust flow, or by recirculating relatively cold gases to cool down a hot exhaust flow. This will assist in keeping the temperature gradient in the component low, which as stated is beneficial to the exhaust after-treatment process.
  • parked regeneration could be improved. More specifically, where an exhaust after-treatment component, such as a diesel particle filter (DPF) is to be regenerated, this can be done a low, idle engine speed. In other words, there is no need to increase the engine speed, as is done in regeneration using an engine heat mode as described above, which causes noise pollution
  • the invention can, in addition to the advantages mentioned, provide a more effective cleaning from NOx and soot of recirculated exhaust gases.
  • the exhaust manipulating device can be of some other type affecting properties of the exhaust gases, such as the pressure or flow thereof.
  • the guiding arrangement may be arranged to guide the exhaust gases from the second location to the first location.
  • the recirculating passage may extend in parallel with the guiding arrangement.
  • the invention is also applicable to exhaust systems comprising parallel branches of conduits, each having one or more respective exhaust manipulating devices.
  • the invention can be embodied the first as well as the second location being in in the same branch.
  • the first and second locations could be in separate branches of the exhaust system.
  • the first location could be downstream of an exhaust manipulating device in one of the branches, and the second location could be upstream of an identical exhaust manipulating device in another of the branches.
  • a location upstream of a certain device in one of the branches is considered to be upstream of a location downstream of an identical and identically arranged device in another of the branches.
  • the exhaust assembly is adapted to be provided in an exhaust system with a plurality of branches, and at normal, warmed up operation of the engine the pressure in a location in one of the branches is higher than the pressure in a further location in another of the branches, the former location is considered to be upstream of the latter location.
  • the exhaust assembly comprises a driving element adapted to drive exhaust gases from the first location to the second location through the recirculating passage.
  • the exhaust assembly could comprise a recirculating arrangement comprising the recirculating passage and the driving element. With the driving element, a flow in the recirculating passage from the first position to the second position can be ensured where there is a negative pressure gradient in the guiding arrangement in the direction from the second position to the first position.
  • the driving element is adapted to increase the dynamic pressure at the second location.
  • the increased dynamic pressure will decrease the static pressure at the second location. Thereby it is possible to create a pressure at the second location which is lower than the pressure in the first location, and this pressure differential will drive the exhaust gases in the recirculation passage.
  • the driving element comprises may comprise an injector providing a Venturi effect accelerating an exhaust gas flow in the guiding arrangement.
  • the driving element is provided as some other type of gas pump, for example as a rotary vane pump, a scroll pump or a Roots blower.
  • the guiding arrangement comprises a main passage and a bypass passage extending in parallel with the main passage and from a third location in the main passage to a fourth location in the main passage, the fourth location being downstream of the third location, the second location being in the bypass passage.
  • the guiding arrangement comprises an exhaust manipulating device, e.g. an exhaust after-treatment component
  • the third location is preferably upstream of the exhaust manipulating device.
  • the fourth location is upstream of the exhaust manipulating device or in the exhaust manipulating device.
  • the guiding arrangement comprises an exhaust
  • the main passage is regarded as comprising the exhaust manipulating device as well.
  • a driving element can be adapted to increase the dynamic pressure at the second location in the bypass passage, by presenting an injector providing a Venturi effect.
  • a valve can be located in the main passage, between the third and fourth locations. The valve can be used to control the flow in the bypass passage, and thereby the dynamic pressure at the second position. Thus, the valve can be used to control the flow in the recirculating passage.
  • the valve is a one-way valve allowing a flow only in a direction from the third location towards the fourth location.
  • the first location is, along with the second location, upstream of the exhaust manipulating device.
  • an auxiliary exhaust after-treatment component can be in the bypass passage, downstream of the second location.
  • the auxiliary exhaust after-treatment component might be a small volume diesel oxidation catalyst (DOC).
  • DOC diesel oxidation catalyst
  • AHI hydrocarbon injection
  • the hydrocarbon injection (AHI) device is located downstream of the second location.
  • Said arrangement provides for a "local" exhaust gas recirculation upstream of the "main" exhaust manipulating device, which could be a DOC.
  • the auxiliary exhaust after- treatment component is a small volume DOC
  • the small volume DOC can be arranged to burn hydrocarbon injected by the AHI device. Such burning will usually require a certain minimum temperature, e.g. 250°C, of the small volume DOC.
  • the aim is for the oxidation in the small volume DOC to reach a very high temperature.
  • the recirculated gas mixed with cold exhaust gases will give a temperature that is high enough for injection by the AHI device.
  • the temperature of the main exhaust manipulating device will depend on mass ratio between exhaust gases coming through the main passage and exhaust gases coming through the bypass passage with the small volume DOC.
  • An auxiliary heating device can be arranged to heat the auxiliary exhaust after-treatment component.
  • the auxiliary heating device can for example be heated electrically. This could provide for the small volume DOC to be heated very quickly at cold start, so that it can start burning fuel from the AHI device, e.g. after a couple of seconds. Thus, there would be no need for any fuel consuming engine heat mode.
  • the auxiliary heating device can be deactivated immediately after the temperature in the recirculation loop has reached a temperature that is high enough for activation of the AHI device.
  • an internal combustion engine system comprising an internal combustion engine, an- intake system for receiving an intake gas and guiding the intake gas to the internal combustion engine, and an exhaust system comprising an exhaust assembly according to any one of the preceding claims, wherein the recirculating passage is separate from the intake system. It is understood that the second location is at an exhaust side of the engine.
  • an exhaust assembly comprising a guiding arrangement adapted to receive exhaust gases from an internal combustion engine, and to guide the exhaust gases towards the atmosphere, and a recirculating arrangement comprising a recirculating passage extending from a first location in the guiding arrangement to a second location in the guiding arrangement, the second location being upstream of the first location, the method comprising
  • the method makes it possible to improve, by the control of the recirculating arrangement in dependence of the determined temperature indicative parameter value, temperature conditions of the exhaust after-treatment component.
  • controlling the recirculating arrangement in dependence of the determined parameter value may comprise controlling the driving element in dependence of the determined parameter value.
  • controlling the driving element in dependence of the determined parameter value can comprise controlling the valve in dependence of the determined parameter value.
  • controlling the driving element in dependence of the determined parameter value can comprise controlling the valve in dependence of the determined parameter value.
  • the parameter may be a temperature of the exhaust gases
  • the method could further comprise determining whether the determined temperature value is below a predetermined threshold value.
  • controlling the recirculating arrangement could comprise providing a flow of exhaust gases in the recirculating passage if the determined temperature value is below the predetermined threshold value, and preventing a flow of exhaust gases in the recirculating passage if the determined temperature value is not below the predetermined threshold value.
  • the method can be used for increasing, when needed, the
  • fig. 1 shows a partly sectioned side view of a vehicle
  • fig. 2 shows an internal combustion engine system in the vehicle in fig. 1 ,
  • fig. 3 shows an exhaust assembly in the internal combustion engine system in fig. 2
  • fig. 4 shows a block diagram depicting a method for controlling the exhaust assembly fig. 5 and fig. 6 show respective exhaust assemblies according to alternative embodiments of the invention
  • Fig. 1 shows a vehicle in the form of a truck, comprising a diesel internal combustion engine 1.
  • Fig. 2 shows an internal combustion engine system of the vehicle in fig. 1 , comprising the internal combustion engine 1, and an intake system 101 for receiving an intake gas such as air, and guiding the intake gas to the internal combustion engine 1.
  • the internal combustion engine system also comprises an exhaust system 2 comprising an exhaust assembly 3, described closer below.
  • the internal combustion engine system further comprises a turbo charger 102 with a turbine 103 in the exhaust system 2 adapted to drive a compressor 104 in the intake system 101.
  • the turbine 102 is located between the internal combustion engine 1 and the exhaust assembly 3. It should be noted that the exhaust assembly 3 is separate from the intake system 101.
  • the exhaust assembly 3 comprises guiding arrangement 4 adapted to receive exhaust gases from an internal combustion engine 1 , and to guide the exhaust gases towards the atmosphere. More specifically, the guiding arrangement 4 is adapted to receive the exhaust gases from the engine 1 via an exhaust manifold 201, shown in fig. 2. The guiding arrangement 4 is adapted to release the exhaust gases towards the atmosphere via an exhaust pipe 202.
  • the exhaust assembly 3 comprises a recirculating arrangement 5, 6 in turn comprising a recirculating passage 5 extending from a first location PI in the guiding arrangement 4 to a second location P2 in the guiding arrangement 4, the second location P2 being upstream of the first location PI.
  • the recirculating passage 5 is separate from the intake system 101 shown in fig. 2. It is also understood that the second location P2 is at an exhaust side of the engine 1.
  • the guiding arrangement 4 comprises three exhaust manipulating devices in the form of exhaust after-treatment components 401, 402, 403 adapted to provide an after-treatment of the exhaust gases. More specifically, in the guiding arrangement flow direction there is a diesel oxidation catalyst (DOC) 401, followed by a diesel particle filter (DPF) 402, in turn followed by a selective catalytic reactor (SCR) 403. All exhaust after-treatment components 401, 402, 403 are located between the first and first locations PI, P2.
  • DOC diesel oxidation catalyst
  • DPF diesel particle filter
  • SCR selective catalytic reactor
  • the recirculating arrangement 5, 6 also comprises a driving element 6 adapted to drive exhaust gases from the first location PI to the second location P2 through the recirculating passage 5.
  • the driving element 6 comprises is an injector adapted to provide a Venturi effect to increase the dynamic pressure at the second location P2. This will decrease the static pressure at the second location P2 to create a pressure at the second location P2 which is lower than the pressure in the first location PI, and this pressure differential will drive the exhaust gases in the recirculation passage 5.
  • the guiding arrangement 4 comprises a main passage 404 and a bypass passage 405 extending in parallel with the main passage 404 and from a third location P3 in the main passage 404 to a fourth location P4 in the main passage 404.
  • the fourth location P4 is downstream of the third location P3 and upstream of the DOC 401.
  • the second location P2 is in the bypass passage 405.
  • a valve 7 is located in the main passage 404, between the third and fourth locations P3, P4.
  • the valve 7 is a one-way valve adapted to allow a flow only in a direction from the third location P3 towards the fourth location P4.
  • valve 7 is used to control the flow in the bypass passage 405, and to thereby control the dynamic pressure provided by the injector 6 at the second position P2.
  • the valve 7 is used to control the flow in the recirculating passage 5.
  • a passage valve 501 is provided in the recirculating passage 5. With the passage valve 501 it is possible to block the recirculating passage 5 when it is not intended to use it.
  • a controller 11 is adapted to control the valve 7 and the passage valve 501.
  • Fig. 4 depicts a method to control the exhaust assembly 3 described above.
  • the method comprises determining SI a value of a temperature Td of the exhaust gases. This can be done for example by means of a temperature sensor (not shown) in the exhaust manifold 201 between the exhaust assembly 3 and the engine 1 , (fig. 2), and the controller 11 can be arranged to receive signals from the temperature sensor.
  • the method further comprises determining S2 whether the determined temperature value is below a predetermined threshold value Tt. If the determined temperature value Td is not below the predetermined threshold value Tt, the valve 7 and the passage valve 501 are controlled S3 to prevent a flow of exhaust gases in the recirculating passage 5.
  • the valve 7 and the passage valve 501 are controlled S4 to provide a flow of exhaust gases in the recirculating passage 5.
  • the SCR 403 will, due to reactions in it, increase the exhaust gas temperature as it passes through the SCR 403.
  • the recirculated exhaust gases from the outlet of the SCR 403 to the inlet of the DOC 401 will increase the temperature at the upstream end of the exhaust after-treatment components 401, 402, 403, and this will reduce the temperature gradient through them, thereby improving their functionality.
  • Fig. 5 shows an alternative embodiment of the invention.
  • the first location PI is along with the second location P2 upstream of the exhaust after-treatment components 401, 402, 403.
  • An auxiliary exhaust after-treatment component in the form of a small volume diesel oxidation catalyst (DOC) 8 is provided in the bypass passage 405, downstream of the second location P2.
  • DOC diesel oxidation catalyst
  • AHI auxiliary hydrocarbon injection
  • the small volume DOC is arranged to burn hydrocarbon injected by the AHI device 10.
  • the recirculated gases mixed with cold exhaust gases will give a temperature that is high enough for this burning process.
  • the temperature of the main DOC 401 will depend on mass ratio between exhaust gases coming through the main passage 404 and exhaust gases coming through the bypass passage 405.
  • An electrically heated auxiliary heating device 9 is arranged to heat the small volume DOC 8. This will provide for the small volume DOC 8 to be heated very quickly at cold start.
  • the auxiliary heating device 9 is deactivated when the temperature in the recirculation loop reaches a temperature that is high enough for activation of the AHI device 10.
  • Fig. 6 shows a further alternative embodiment of the invention. Similarly to the embodiment in fig. 3, the exhaust after-treatment components 401, 402, 403 are located between the first and second location PI, P2. However, there is no bypass passage 405 and no injector 6.
  • the driving element is embodies in the form of another type of gas pump 6.
  • Fig. 7 shows yet another embodiment of the invention. It is applicable to an exhaust system comprising two parallel branches 203, 204 of conduits, each having a set of exhaust after- treatment components 401, 402, 403 as described above with reference to fig. 3.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

La présente invention concerne un ensemble d'échappement (3) comprenant un passage de recirculation (5) au niveau du côté échappement d'un moteur s'étendant d'un premier emplacement (P1) à un second emplacement (P2) en amont de l'agencement de guidage (4), le premier emplacement (P1) étant en aval (ou également en amont) d'au moins un dispositif de traitement de gaz d'échappement (401, 402, 403), destiné à chauffer le gaz d'échappement amont par ajout du gaz d'échappement aval chaud d'un traitement d'échappement catalytique de type DOC ou d'un autre dispositif de chauffage auxiliaire de type EHC, ou à augmenter le débit massique à travers des dispositifs de traitement d'échappement de type DOC, DPF et SCR. Le passage de recirculation (5) comprenant les premier (P1) et second (P2) emplacements peut également être intégré à un agencement de dérivation (405).
PCT/EP2014/003173 2014-11-27 2014-11-27 Système de purification de gaz d'échappement de moteurs à combustion interne à recirculation de gaz d'échappement WO2016082850A1 (fr)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106968761A (zh) * 2017-04-25 2017-07-21 江铃汽车集团公司 自生负压柴油机动车尾气颗粒捕捉装置
US11982219B2 (en) 2017-06-06 2024-05-14 Cummins Emission Solutions Inc. Systems and methods for mixing exhaust gases and reductant in an aftertreatment system
USD1042545S1 (en) 2022-04-21 2024-09-17 Cummins Emission Solutions Inc. Aftertreatment system
USD1042544S1 (en) 2022-04-21 2024-09-17 Cummins Emission Solutions Inc. Aftertreatment system
US12123337B2 (en) 2021-03-18 2024-10-22 Cummins Emission Solutions Inc. Aftertreatment systems
US12173632B2 (en) 2020-10-22 2024-12-24 Cummins Emission Solutions Inc. Exhaust gas aftertreatment system
US12188842B2 (en) 2021-08-23 2025-01-07 Cummins Emission Solutions Inc. Outlet sampling system for aftertreatment system
US12264612B2 (en) 2020-02-27 2025-04-01 Cummins Emission Solutions Inc. Mixers for use in aftertreatment systems
US12281605B2 (en) 2021-07-27 2025-04-22 Cummins Emision Solutions Inc. Exhaust gas aftertreatment system
US12352196B2 (en) 2021-02-02 2025-07-08 Cummins Emission Solutions Inc. Exhaust gas aftertreatment system

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EP0957243A2 (fr) * 1998-02-20 1999-11-17 Volkswagen Aktiengesellschaft Traitement d'oxydes d'azote dans un moteur Otto alimenté par un mélange pauvre
DE10051358A1 (de) * 2000-10-17 2002-06-20 Bosch Gmbh Robert Abgasreinigungsanlage mit einer Katalysatoranordnung und Verfahren zur Reinigung von Abgasen
US20130086893A1 (en) * 2010-06-18 2013-04-11 Toyota Jidosha Kabushiki Kaisha Exhaust gas control apparatus for internal combustion engine
FR2981983A1 (fr) * 2011-10-26 2013-05-03 Peugeot Citroen Automobiles Sa Dispositif de depollution des gaz d'echappement pour un moteur a combustion interne.
JP2013124608A (ja) * 2011-12-15 2013-06-24 Mitsubishi Motors Corp 内燃機関の排気浄化装置

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EP0957243A2 (fr) * 1998-02-20 1999-11-17 Volkswagen Aktiengesellschaft Traitement d'oxydes d'azote dans un moteur Otto alimenté par un mélange pauvre
DE10051358A1 (de) * 2000-10-17 2002-06-20 Bosch Gmbh Robert Abgasreinigungsanlage mit einer Katalysatoranordnung und Verfahren zur Reinigung von Abgasen
US20130086893A1 (en) * 2010-06-18 2013-04-11 Toyota Jidosha Kabushiki Kaisha Exhaust gas control apparatus for internal combustion engine
FR2981983A1 (fr) * 2011-10-26 2013-05-03 Peugeot Citroen Automobiles Sa Dispositif de depollution des gaz d'echappement pour un moteur a combustion interne.
JP2013124608A (ja) * 2011-12-15 2013-06-24 Mitsubishi Motors Corp 内燃機関の排気浄化装置

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106968761A (zh) * 2017-04-25 2017-07-21 江铃汽车集团公司 自生负压柴油机动车尾气颗粒捕捉装置
CN106968761B (zh) * 2017-04-25 2020-06-30 江铃汽车集团公司 自生负压柴油机动车尾气颗粒捕捉装置
US11982219B2 (en) 2017-06-06 2024-05-14 Cummins Emission Solutions Inc. Systems and methods for mixing exhaust gases and reductant in an aftertreatment system
US12264612B2 (en) 2020-02-27 2025-04-01 Cummins Emission Solutions Inc. Mixers for use in aftertreatment systems
US12173632B2 (en) 2020-10-22 2024-12-24 Cummins Emission Solutions Inc. Exhaust gas aftertreatment system
US12352196B2 (en) 2021-02-02 2025-07-08 Cummins Emission Solutions Inc. Exhaust gas aftertreatment system
US12123337B2 (en) 2021-03-18 2024-10-22 Cummins Emission Solutions Inc. Aftertreatment systems
US12281605B2 (en) 2021-07-27 2025-04-22 Cummins Emision Solutions Inc. Exhaust gas aftertreatment system
US12188842B2 (en) 2021-08-23 2025-01-07 Cummins Emission Solutions Inc. Outlet sampling system for aftertreatment system
USD1042545S1 (en) 2022-04-21 2024-09-17 Cummins Emission Solutions Inc. Aftertreatment system
USD1042544S1 (en) 2022-04-21 2024-09-17 Cummins Emission Solutions Inc. Aftertreatment system

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