WO2013135250A1 - Method for enriching exhaust gases with unburnt hydrocarbon - Google Patents
Method for enriching exhaust gases with unburnt hydrocarbon Download PDFInfo
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- WO2013135250A1 WO2013135250A1 PCT/EP2012/001122 EP2012001122W WO2013135250A1 WO 2013135250 A1 WO2013135250 A1 WO 2013135250A1 EP 2012001122 W EP2012001122 W EP 2012001122W WO 2013135250 A1 WO2013135250 A1 WO 2013135250A1
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- engine
- operating conditions
- cylinders
- exhaust
- engine operating
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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
- F01N3/2033—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using a fuel burner or introducing fuel into exhaust duct
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/008—Controlling each cylinder individually
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
- F02D41/025—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus by changing the composition of the exhaust gas, e.g. for exothermic reaction on exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
- F02D41/405—Multiple injections with post injections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/42—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders
- F02M26/43—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders in which exhaust from only one cylinder or only a group of cylinders is directed to the intake of the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0406—Layout of the intake air cooling or coolant circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
- F02D41/0055—Special engine operating conditions, e.g. for regeneration of exhaust gas treatment apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0065—Specific aspects of external EGR control
- F02D41/0072—Estimating, calculating or determining the EGR rate, amount or flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
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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
-
- 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
- This invention relates to a method for enriching the exhaust gases of a combustion engine with unburnt hydrocarbon, said combustion engine comprising a plurality of cylinders, at least one exhaust manifold for receiving exhaust gases from at least two of said plurality of cylinders, and an EGR circuit for supplying exhaust gases from said exhaust manifold to an air inlet of at least one of said cylinders, wherein said exhaust manifold comprises a first outlet for supplying exhaust gases to an exhaust aftertreatment system, and a second outlet for supplying exhaust gases to said EGR circuit.
- the invention also relates to a computer program comprising program code means, a computer program product comprising program code means stored on a computer readable medium, as well as a computer system for implementing said method for enriching the exhaust gases of a combustion engine with unburnt hydrocarbon.
- the inventive method is particularly applicable for diesel engines where regeneration of the exhaust aftertreatment system periodically may be needed.
- the diesel engine is known for operational reliability and low fuel consumption but does not produce as low emissions as, for example, a petrol engine provided with a three-way catalyst.
- One way of improving the emissions from a diesel engine is to fit a particle filter which filters soot and particles from the exhaust gases and/or the NOx post-treatment system. These filters are usually very effective and gather both large and small particles. To prevent the filter from becoming full of soot and causing a major pressure drop for the exhaust gases leaving the engine, the soot has to be burnt.
- One method is for this soot to be burnt by the nitrogen oxides contained in diesel exhaust gases.
- the portion of the nitrogen oxides that takes the form of NO2 can oxidise the soot within the temperature interval of about 250 to 400 Degrees centigrade but this process takes a relatively long time and needs to be more or less constantly active even if there is an oxidation catalyst before the filter or the filter itself is covered with a catalytic layer.
- Another method for oxidising soot accumulated in the particle filter is to heat the filter to about 600-650 degrees centigrade so that the surplus oxygen O2 from diesel combustion can oxidise the soot directly, which is a rapid process. Soot accumulated over many hours of operating time can be oxidised away in a time of the order of 5 to 10 minutes.
- the exhaust temperature of a diesel engine normally never reaches 600- 650 Degrees centigrade particularly after a turbo unit whereby the turbine extracts power from the exhaust flow and causes a temperature drop. It is not unusual that the exhaust temperature after the turbine of the turbo unit is lower than 250 Degrees centigrade, which is a temperature below which an oxidation catalyst does not function properly.
- Temporarily increased temperature of the exhaust for regeneration of a NOx trap, such as a particle filter may for example be realised by supplying unburnt hydrocarbon, e.g. in the form of fuel into the exhaust gas upstream of the NOx trap or NOx catalyst.
- unburnt hydrocarbon e.g. in the form of fuel
- One common solution is to provide the exhaust system with a separate fuel injector for injecting unburnt hydrocarbon directly into the exhaust system upstream of the particulate filter.
- This solution however requires an additional fuel injector located within the exhaust system, as well as fuel supply lines to said additional fuel injector, thereby increasing the cost, maintenance requirement, and risk of malfunction of the exhaust aftertreatment system.
- unburnt hydrocarbon is supplied by in- cylinder post injection of fuel into one or more cylinders.
- This solution thus does not require an additional fuel injector for providing unburnt hydrocarbon to the exhaust gas.
- EGR exhaust gas recirculation
- Some of the most modern diesel engines are often equipped with exhaust gas recirculation (EGR) to reduce emissions of nitrogen oxides.
- EGR exhaust gas recirculation
- Combining in-cylinder post injection, EGR system, and particle filters and/or NOx post-treatment by so-called NOx trap or NOx catalyst entails complications, such as potential contamination of the EGR circuit by unburnt hydrocarbon, as well as enriching the intake air with the unburnt hydrocarbon, possibly resulting in altered combustion conditions.
- An object of the present invention is to provide a method for enriching the exhaust gases of a combustion engine with unburnt hydrocarbon where the previously mentioned problem is at least partly avoided. This object is achieved by the features of the characterising portion of claim 1.
- the invention concerns a method for enriching the exhaust gases of a combustion engine with unburnt hydrocarbon, said combustion engine comprising a plurality of cylinders, at least one exhaust manifold for receiving exhaust gases from at least two of said plurality of cylinders, and an EGR circuit for supplying exhaust gases from said exhaust manifold to an air inlet of at least one of said cylinders, wherein said exhaust manifold comprises a first outlet for supplying exhaust gases to an exhaust aftertreatment system, and a second outlet for supplying exhaust gases to said EGR circuit.
- the invention is characterized by the step of monitoring engine operating conditions, and performing in-cylinder post injection of said unburnt hydrocarbon into one predetermined cylinder of said at least two cylinders connected to the exhaust manifold when the monitored engine operating conditions equal predetermined engine operating conditions, which predetermined engine operating conditions are set for resulting in a substantially zero flow of said post-injected hydrocarbon to the EGR circuit for the specific design of the engine in operation.
- One advantageous effect of the method according to the invention is the possibility to omit any fuel injector arranged in the exhaust system for the sole purpose of regenerating parts of the exhaust aftertreatment system by heating, and instead using one or more of the existing combustion cylinders fuel injectors for this purpose. Omission of a fuel injector within the exhaust system results in reduced costs and increased reliability of the engine and exhaust system.
- a further advantage is a high degree of separation of exhaust gas from cylinder in which post injection of fuel is performed and exhaust gas entering the EGR circuit, without expensive or space-consuming measures.
- the inventive method allows simultaneous in- cylinder post injection of fuel and active EGR operation, such that a continuously high level of NOx reduction by the EGR system can be provided.
- a combination of said one predetermined cylinder and said predetermined engine operating conditions may be based on a mapping and/or modelling from which cylinder the exhaust gases flowing through said EGR circuit origins at different engine operating conditions.
- the mapping and/or modelling is used to determine from which individual cylinder the exhaust gas flowing in the EGR circuit origins and thereby to determine which cylinder the in-cylinder post injection of fuel advantageously should be conducted for a specific engine operating condition.
- this one or more cylinders can be registered as suitable for said fuel post injection upon registering required predetermined engine operating conditions. It may be preferred to perform said in-cylinder post injection of said unburnt hydrocarbon into said one predetermined cylinder only when said monitored engine operating conditions equal said predetermined engine operating conditions, because then substantially normal operation of the EGR circuit can be realised.
- the performance of in-cylinder post injection of said unburnt hydrocarbon into said one predetermined cylinder may be the only means for enriching the exhaust gases of said combustion engine with unburnt hydrocarbon and at the same time avoiding that the post-injected hydrocarbon reaches the EGR circuit.
- the engine operating conditions may preferably comprise at least engine speed and engine load.
- An additional or alternative engine operating condition comprises exhaust gas flow rate in said EGR circuit, or a corresponding parameter.
- the EGR circuit may be provided with a single EGR valve for each exhaust manifold, or for each set of cylinders, or for each engine.
- Conventional EGR systems uses a single EGR valve to control the EGR flow rate, and additional control valves for preventing unburnt hydrocarbon from entering the EGR circuit leads to increased costs and reduced reliability of the engine, as well as increased maintenance effort.
- the first and second outlets may be positioned at a distance from each other in a direction parallel with an alignment direction of the cylinders connected to said at least one exhaust manifold. Separation of the first and second outlets in said direction increases the amount of engine operating conditions in which fuel post injection can be performed without too high level of unburnt hydrocarbons entering the EGR circuit.
- the exhaust manifold may preferably be free from internal partition walls and/or controllable flow valves.
- the present invention further provides a computer program comprising program code means for performing all the steps of the inventive method described above when said program is run on a computer.
- the present invention further provides a computer program product comprising program code means stored on a computer readable medium for performing all the steps of the inventive method described above when said program product is run on a computer.
- the present invention further provides a computer system for implementing the method for enriching the exhaust gases of a combustion engine with unburnt hydrocarbon, said combustion engine comprising a plurality of cylinders, at least one exhaust manifold for receiving exhaust gases from at least two of said plurality of cylinders, and an EGR circuit for supplying exhaust gases from said exhaust manifold to an air inlet of at least one of said cylinders, wherein said exhaust manifold comprises a first outlet for supplying exhaust gases to an exhaust aftertreatment system, and a second outlet for supplying exhaust gases to said EGR circuit, the computer system comprising a processor operable to monitor engine operating conditions and commanding in-cylinder post injection of said unburnt hydrocarbon into one predetermined cylinder of said at least two cylinders connected to the exhaust manifold when the monitored engine operating conditions equal predetermined engine operating conditions, which pre
- Figure 1 shows an engine layout on which the method according to the invention can be applied; and Figure 2 shows schematically a 2D layout of a typical exhaust manifold to be used with the engine of fig. 1.
- the combustion engine 10 schematically depicted in Fig. 1 comprises an engine block 11 with six piston-cylinders 12 with an inlet manifold 13 and an exhaust manifold 14. Exhaust gases are led via an exhaust passage 15 to the turbine wheel 17 of a turbo unit 16. Said exhaust passage 15 being connected to the exhaust manifold 14 at a first outlet 26 of the exhaust manifold 14.
- the turbine shaft 18 drives the compressor wheel 19 of the turbo unit 16 that compresses air coming in via an inlet passage 20 and passes it on via a charge air cooler 21 to the inlet manifold 13. Fuel is supplied to the respective cylinders 12 via (undepicted) injection devices.
- Exhaust gases which have passed through the turbine unit 16 are led to the atmosphere via the exhaust line 22, which leads the exhaust gases through an exhaust aftertreatment system 23 that includes a regenerable particle trap or NOx trap.
- Regeneration of the particle trap is effected by supply of unburnt fuel from any of the cylinders 12, e.g. by so-called "post-injection", which by oxidation of the fuel in a catalyst upstream of the particle filter raises the temperature in the particle trap sufficiently for soot in the latter to ignite and burn away.
- Exhaust gases from the exhaust manifold 14 are also led back to the inlet side of the engine 10 via a conduit 24 in order to reduce the discharge of nitrogen oxides from the engine 10 by known exhaust gas recirculation (EGR) technology.
- Said conduit 24 being connected to the exhaust manifold 14 at a second outlet 27 of the exhaust manifold 14.
- This EGR circuit comprises a valve 25 serving both as a one-way valve and as a control valve for regulating the EGR flow.
- In-cylinder post injection is effected with a crankshaft angle interval in which the conditions for the fuel to ignite in the cylinder are not fulfilled. This is for example the case when the fuel is injected into a cylinder 12 during the latter part of the expansion stroke or during the exhaust stroke. If the fuel is injected into the cylinder 12, the same injection equipment can preferably be used as for the ordinary fuel injection.
- the method according to the invention for enriching the exhaust gases of a combustion engine 10 with unburnt hydrocarbon comprises the steps of monitoring engine operating conditions, and performing in-cylinder post injection of fuel when the monitored engine operating conditions equal predetermined engine operating conditions.
- the monitoring step can for example be realised by acquiring desired engine operating conditions, either be sensors or model based estimations, with a sufficient sampling frequency.
- Preferred engine operating conditions according to the invention are engine speed and engine load.
- An additional or alternative engine operating condition is exhaust gas flow rate in the EGR circuit.
- Engine speed is easily measured using a camshaft speed sensor or the like.
- Engine load may be either be estimated using for example an engine load model, which include fuel injection data, or the like, or measured using for example an engine output torque measurement, or the like.
- Exhaust gas flow rate in the EGR circuit may be measured, for example by means of an EGR flow meter, or estimated based on various relevant parameters.
- the step of performing in-cylinder post injection of fuel when the monitored engine operating conditions equal predetermined engine operating conditions may be realised by an engine management system that is configured to continuously check if the current engine operating conditions equal the predetermined engine operating conditions, and commanding in-cylinder post injection of fuel into a predetermined cylinder 12 when said current engine conditions and predetermined engine conditions coincide.
- Each of said predetermined engine operating conditions here corresponds to one or more predetermined ranges of that individual operating condition.
- the predetermined engine operating conditions, in combination with in- cylinder post injection into the predetermined cylinder 12, are set for resulting in a substantially zero flow of the post-injected hydrocarbon to the EGR circuit for the specific design of the engine in operation.
- mapping and/or modelling thus aims to determine the exhaust gas flow route from each individual cylinder of the engine 10, for multiple different operating conditions.
- the mapping and/or modelling establishes the exhaust gas flow route of each individual cylinder of the engine for all different operating conditions, but due to limitations in the effort of acquiring said individual cylinder exhaust gas flow, the resulting exhaust gas flow map may have a reduced degree of resolution, being based on a reasonable number of different engine operating conditions instead.
- Table 1 below illustrates a first example of such a mapping, which shows from which cylinder the exhaust gases flowing through the EGR circuit comes from.
- the specific mapping of table 1 is based on modelling and simulation of an exhaust manifold layout as schematically depicted in fig. 2.
- the mapping of table 1 illustrates the cylinder origin of the exhaust gases flowing through the EGR circuit with the following engine operating conditions: Engine speed 28,3 rotation per second; max engine load.
- Table 2 below illustrates a second example of such a mapping based also on the exhaust layout of fig. 2, but in a low engine speed mode having the following engine operating conditions: Engine speed 19,5 rotation per second; max engine load.
- the data of table 2 corresponds to a large degree the earlier high engine speed mode, and also here is established that each of cylinders 4, 5 and 6 contributes relatively little to the exhaust gases of the EGR circuit, making each of them potential cylinders 12 for performing in-cylinder post injection of fuel.
- the mapping was here made by analysing the exhaust flow pattern using a 3D computational fluid dynamic CFD model of the exhaust manifold and EGR valve housing, coupled with an engine performance simulation software program, which is based on model of the physical engine used, including parameters such as pipe dimensions, location and shape of the EGR circuit, etc.
- the engine performance simulation program and the 3D CFD model were interconnected by means of eight CFD-Connections corresponding to exhaust manifold cylinder connections 1 , 2, 3, 4, 5, 6, manifold turbine connection 26, and manifold EGR circuit connection 27.
- the mapping may be realised by measuring of the exhaust gas flow pattern.
- the EGR valve was here modelled in a fully open position, and assumptions on thermodynamic properties, such as molar weight, viscosity, specific heat, temperature and conductivity, was included in the CFD-analysis.
- the CFD model was simulated stand alone and transiently with time varying mass flow, pressure and temperature data imposed at boundaries thereof. Mass flows and temperature were imposed at the cylinder connections 1 , 2, 3, 4, 5, 6, and pressure and temperature were imposed at the turbine connection 26 and EGR-circuit connection 27.
- Each exhaust port boundary was assigned its own scalar with identical passive properties for the purpose of tracking the route of the exhaust gas from each cylinder.
- mapping of the EGR exhaust gas cylinder origin at different engine operating conditions is possible for all possible engine configurations, and that combinations of in-cylinder post injection of fuel into one individual cylinder 12 during periods of certain engine operating conditions resulting in significantly reduced level of unburnt hydrocarbon entering the EGR circuit, or even completely prevented, can be determined. Moreover, the result is accomplished despite the exhaust system not being divided into separate portions, despite no additional control valve except the EGR valve is present in the exhaust manifold 14 for preventing post-injected fuel from entering the EGR circuit, and despite all the exhaust gases being collected in one and the same duct of the exhaust manifold 14 entirely outside the exhaust ports of each cylinder 12.
- In-cylinder post injection of unburnt hydrocarbon into the predetermined cylinder 12 is preferably only performed when the monitored engine operating conditions equal the predetermined engine operating conditions. This strategy normally results in small or insignificant amount of unburnt hydrocarbons entering the EGR circuit, depending on exhaust manifold design. If however regeneration of a part of the exhaust aftertreatment system 23 is urgently required, and in-cylinder post injection of fuel into a cylinder 12 is the only means for enriching the exhaust gases of the combustion engine 10 with unburnt hydrocarbon, and the predetermined engine operating conditions have still not been detected by the engine management system that monitors the engine operating conditions, in- cylinder post injection of fuel may exceptionally be required performed anyway. Possibly, the EGR valve 25 may be closed during this post injection period to prevent unburnt fuel from entering the EGR circuit.
- the inventive method regenerates at least a part of the exhaust aftertreatment system 23 by means of the post-injected hydrocarbon.
- the main part requiring regeneration is the diesel exhaust gas particulate filter, which occasionally may be heated up sufficiently to burn off the captured soot particulates therein.
- Many different alternative exhaust manifold layouts are possible within the scope of the invention, but a certain spacing of the first and second outlets 26, 27 is generally required to achieve a reduced level of unburnt fuel entering the EGR circuit. In the exhaust manifold layout of fig. 2, the first and second outlets 26, 27 are positioned at a distance D from each other in a direction parallel with the alignment direction 28 of the cylinders 1 connected to the exhaust manifold 14.
- the second outlet 27 is here positioned between a first end 29 of the manifold and a centre point 30 of the exhaust manifold 14.
- the predetermined cylinder 12 selected for post-injection of hydrocarbon is positioned between a second end 31 of the exhaust manifold 14 and the centre point 30 of the exhaust manifold 14.
- the illustrated layout of fig.2 should merely be seen as an exemplary layout, and both the first and/or second outlet 26, 27 may be positioned more or less towards the first or second ends 29, 31 of the manifold 14, without departing from the invention, as long as a combination of cylinder for fuel post injection and engine operating conditions can be determined that results in reduced levels of unburnt fuel within the EGR circuit.
- the first outlet 26 is arranged centrally of the exhaust manifold 14 as seen in the alignment direction 28 of the cylinders 12 connected to the exhaust manifold 14, and the second outlet 27 is offset a distance D towards the first end 29 from the first outlet 26 in the alignment direction 28 of the cylinders 12. More exact, the second outlet 27 is arranged oppositely an inlet from the second cylinder 12.
- the exhaust manifold 14 is generally formed by a single duct 32, from which individual pipe segments 33 extend to each individual cylinder 12 of the engine 10 associated with the specific exhaust manifold 14. Exhaust gases from different cylinders 12 entering the common single duct 32 is thus free to mix since no internal partition walls for dividing the single duct 32 into multiple segments exist.
- the engine 10 according to the embodiment of fig. 1 comprises six cylinders 12 arranged in a straight line along the alignment axis 28.
- the inventive method is not limited to this engine configuration, but other straight or V engine configurations are included within the scope of the invention, such as for example straight four or five cylinder configuration, a V6 or V8 cylinder configuration.
- a separate exhaust manifold 14 is normally provided for each row of cylinders 12.
- the invention also includes a computer program comprising program code means for performing all the steps of the inventive method, when the program is run on a computer.
- a computer program product comprising the program code means may be stored on a computer readable medium.
- the invention further encompasses a computer system for implementing the inventive method described above.
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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)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
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Priority Applications (7)
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US14/382,377 US9243536B2 (en) | 2012-03-14 | 2012-03-14 | Method for enriching exhaust gases with unburnt hydrocarbon |
JP2014561289A JP6301845B2 (en) | 2012-03-14 | 2012-03-14 | Method for enriching exhaust gas with unburned hydrocarbons |
CN201280071450.9A CN104169552B (en) | 2012-03-14 | 2012-03-14 | Method with unburned Hydrocarbon enriching aerofluxus |
RU2014141111A RU2606955C2 (en) | 2012-03-14 | 2012-03-14 | Method of exhaust gases enrichment with unburned hydrocarbons |
EP12711344.7A EP2825755B1 (en) | 2012-03-14 | 2012-03-14 | Method for enriching exhaust gases with unburnt hydrocarbon |
PCT/EP2012/001122 WO2013135250A1 (en) | 2012-03-14 | 2012-03-14 | Method for enriching exhaust gases with unburnt hydrocarbon |
IN1976MUN2014 IN2014MN01976A (en) | 2012-03-14 | 2014-10-06 |
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PCT/EP2012/001122 WO2013135250A1 (en) | 2012-03-14 | 2012-03-14 | Method for enriching exhaust gases with unburnt hydrocarbon |
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US (1) | US9243536B2 (en) |
EP (1) | EP2825755B1 (en) |
JP (1) | JP6301845B2 (en) |
CN (1) | CN104169552B (en) |
IN (1) | IN2014MN01976A (en) |
RU (1) | RU2606955C2 (en) |
WO (1) | WO2013135250A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3640447A1 (en) * | 2018-10-19 | 2020-04-22 | Deere & Company | Engine system and method with hydrocarbon injection and egr |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9719389B2 (en) * | 2015-06-01 | 2017-08-01 | GM Global Technology Operations LLC | System and method for reducing cold start emissions using an active exhaust throttle valve and an exhaust gas recirculation loop |
US10794251B2 (en) * | 2016-09-22 | 2020-10-06 | Caterpillar Inc. | Fuel apportionment strategy for in-cylinder dosing |
US10495035B2 (en) * | 2017-02-07 | 2019-12-03 | Southwest Research Institute | Dedicated exhaust gas recirculation configuration for reduced EGR and fresh air backflow |
WO2019017928A1 (en) | 2017-07-19 | 2019-01-24 | Cummins Inc. | Techniques for transient estimation and compensation of control parameters for dedicated egr engines |
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- 2012-03-14 WO PCT/EP2012/001122 patent/WO2013135250A1/en active Application Filing
- 2012-03-14 JP JP2014561289A patent/JP6301845B2/en not_active Expired - Fee Related
- 2012-03-14 CN CN201280071450.9A patent/CN104169552B/en active Active
- 2012-03-14 US US14/382,377 patent/US9243536B2/en active Active
- 2012-03-14 RU RU2014141111A patent/RU2606955C2/en active
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EP0889220A2 (en) * | 1997-07-01 | 1999-01-07 | Toyota Jidosha Kabushiki Kaisha | A fuel injecting device for an engine |
US6141959A (en) | 1997-07-16 | 2000-11-07 | Daimlerchrysler Ag | Multi-cylinder air-compressing injection-type internal-combustion engine |
US20050241299A1 (en) * | 2004-04-30 | 2005-11-03 | Brown David B | Low emission diesel particulate filter (DPF) regeneration |
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US10815920B2 (en) | 2018-10-19 | 2020-10-27 | Deere & Company | Engine system and method with hydrocarbon injection and EGR |
Also Published As
Publication number | Publication date |
---|---|
CN104169552A (en) | 2014-11-26 |
EP2825755A1 (en) | 2015-01-21 |
EP2825755B1 (en) | 2020-12-16 |
US20150107227A1 (en) | 2015-04-23 |
CN104169552B (en) | 2016-09-14 |
RU2014141111A (en) | 2016-05-10 |
JP2015513638A (en) | 2015-05-14 |
US9243536B2 (en) | 2016-01-26 |
IN2014MN01976A (en) | 2015-09-11 |
JP6301845B2 (en) | 2018-03-28 |
RU2606955C2 (en) | 2017-01-10 |
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