US20190101038A1 - A control system and a method for controlling the exhaust gas flow in an exhaust line of a combustion engine - Google Patents
A control system and a method for controlling the exhaust gas flow in an exhaust line of a combustion engine Download PDFInfo
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- US20190101038A1 US20190101038A1 US16/083,326 US201716083326A US2019101038A1 US 20190101038 A1 US20190101038 A1 US 20190101038A1 US 201716083326 A US201716083326 A US 201716083326A US 2019101038 A1 US2019101038 A1 US 2019101038A1
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- Prior art keywords
- exhaust
- evaporator
- treatment component
- flow
- temperature
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Classifications
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/0205—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using heat exchangers
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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
- F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
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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
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy the devices using heat
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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
- F01N2240/02—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 a heat exchanger
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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
- F01N2240/36—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 exhaust flap
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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
- F01N3/2093—Periodically blowing a gas through the converter, e.g. in a direction opposite to exhaust gas flow or by reversing exhaust gas flow direction
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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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- 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
-
- 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
Abstract
The present invention relates a control system and a method for controlling exhaust flow in an exhaust line of a combustion engine comprising at least one exhaust treatment component and an evaporator of a waste heat recovery system. The control system comprises a valve arrangement in the exhaust line control unit, a temperature sensor to sense a temperature of the exhaust treatment component and a control unit configured to position the valve arrangement in a first position, when the exhaust treatment component has a lower temperature than a specific temperature of exhaust gases directed flow through to the exhaust treatment component before being directed to flow through the evaporator, and in a second position, when the exhaust treatment component has a higher temperature than said specific temperature of exhaust gases that are directed to flow through the evaporator before being directed to flow through the exhaust treatment component.
Description
- This application is a national stage application (filed under 35 § U.S.C. 371) of PCT/SE2017/050249, filed Mar. 15, 2017 of the same title, which, in turn claims priority to Swedish Application No. 1650345-0, filed Mar. 15, 2016 of the same title; the contents of each of which are hereby incorporated by reference.
- The present invention relates to a control system and a method for controlling the exhaust gas flow in an exhaust line of a combustion engine.
- Exhaust lines of internal combustion engines such as diesel engines may comprise a plurality of exhaust treatment components such as, for example, a SCR catalyst (Selective Catalytic Reduction). In order to clean the exhaust gases from nitrogen oxides, a urea solution is sprayed into the exhaust line in a position upstream of the SCR catalyst. The urea solution is vaporized by the hot exhaust gases so that ammonia is formed. The ammonia and nitrogen oxides in the exhaust gases react with each other in the SCR catalyst so that nitrogen gas and water vapor are formed. The efficiency of a SCR catalyst depends on its temperature. The ability of the SCR catalyst to reduce nitrogen oxides is optimal within a temperature range which may be about 300-450° C. At lower and higher exhaust gas temperatures the capacity of the SCR catalyst to reduce nitrogen oxides is reduced.
- WHR system (Waste Heat Recovery System) can be used for recovering waste thermal energy and convert it to mechanical energy or electric energy. A WHR system includes a pump which pressurizes and circulates a working medium in a closed circuit. The circuit comprises an evaporator where the working medium is heated and evaporated by a heat source such as, for example, exhaust gases. The pressurized and heated gaseous working medium expands in an expander. The expander generates mechanical energy which can be used to support the engine and/or apparatuses in a vehicle. Alternatively, the expander is connected to a generator generating electric energy. The working medium leaving the expander is directed to a condenser. The working medium is cooled down in the condenser to a temperature at which it condenses. The fuel consumption of a combustion engine can be reduced by means of a WHR-system.
- The exhaust gases are cooled down in an evaporator of a WHR system. In view of this fact, the evaporator is arranged in a downstream position of the exhaust treatment components. In this position, the existence of the evaporator does not influence on the operation of the exhaust treatment components. However, in case when the combustion engine is high loaded during a longer period of time, there is a risk that the exhaust gases heat the exhaust treatment components to a too high temperature. In this cases, the exhaust treatment components do not provide an optimal treatment of the exhaust gases and might be permanently damaged.
- The object of the present invention is to control the exhaust gas flow in an exhaust line comprising at least one exhaust treatment component and an evaporator of a WHR system in a manner such that the exhaust treatment component provides a substantially optimal treatment of the exhaust gases also during operating conditions when the exhaust gases have a high temperature.
- The above mentioned object is achieved by the control system according to the claims. During operating conditions when an exhaust treatment component has a lower temperature than a specific temperature, the control unit initiates a movement of a valve arrangement to a first position in which it directs the exhaust gases to the exhaust treatment component before the exhaust gas flow is directed to the evaporator. The specific temperature may be an upper temperature of a temperature range at which the exhaust treatment component provides a substantially optimal treatment of the exhaust gases. The specific temperature may be a constant temperature or a temperature varying with other operating parameters. When the valve arrangement is in the first position, the relatively hot exhaust gases may increase or maintain the temperature the exhaust treatment component before they are cooled down in the evaporator. During operating conditions when the exhaust treatment component has a higher temperature than the specific temperature, the control unit initiates a movement of the valve arrangement to a second position in which the exhaust gases are directed to the evaporator before they are directed to the exhaust treatment component. In this case, the exhaust gases are cooled down in the evaporator before they enter the exhaust treatment component. In this case, the exhaust gases entering the exhaust treatment component mostly have a lower temperature than the exhaust treatment component. As a consequence, the exhaust gases cool down the exhaust treatment component. As soon as the exhaust treatment component has been cooled to a temperature below the specific temperature, the control systems initiates a movement of the valve arrangement back to the first position. The control system makes it possible to avoid heating of the exhaust treatment component to a too high temperature. As a consequence, it is possible to maintain a substantially optimal treatment of the exhaust gases even when the exhaust gases have a very high temperature. Furthermore, the exhaust gases may receive a lower temperature when they have passed through the exhaust treatment component. As a consequence, the working medium in the evaporator may be heated to a higher temperature when the valve arrangement is in the second position which increases the efficiency of the WHR system.
- According to an embodiment of the invention, the valve arrangement comprises a valve member which alternatively directs exhaust gases from an upstream exhaust line section to the exhaust treatment component or to the evaporator. By means of such a valve member, it is easy to alternatively direct the exhaust gas flow initially to the exhaust treatment component or the evaporator. The exhaust line may comprise at least one intermediate exhaust line directing exhaust gases between the exhaust treatment component and the evaporator and a valve member configured to control the exhaust gas flow through the intermediate exhaust line. When the valve arrangement is in the first position, such an intermediate exhaust line directs the exhaust gases from the exhaust treatment component to the evaporator. When the valve arrangement is in the second position, such an intermediate exhaust line directs the exhaust gases from the evaporator to the exhaust treatment component. The exhaust gas flow through the intermediate exhaust line may be controlled by a valve member. Furthermore, the valve arrangement may comprise a valve member which alternatively directs the exhaust gases from the exhaust treatment component or the evaporator to a downstream exhaust line section. By means of such a valve member, it is easy to alternatively direct the exhaust gas flow from the exhaust treatment component or the evaporator to a downstream located part of the exhaust line. The valve member may be of arbitrary kind. The valve member may, for example, be a butterfly valve.
- According to an embodiment of the invention, the valve arrangement comprises a valve member which, in said first position, is configured to direct exhaust gases from an upstream exhaust line section to the exhaust treatment component and from the evaporator to a downstream exhaust line section. Such a valve member may, in said second position, be configured to direct exhaust gases from the upstream exhaust line section to the evaporator and from the exhaust treatment component to the downstream exhaust line section. Such a valve member has several tasks. Thus, a valve arrangement including such a valve member may include few further valve members.
- According to an embodiment of the invention, the valve arrangement may comprise a valve member which, in said first position, is configured to direct exhaust gases from an upstream exhaust line section to the exhaust treatment component and from the exhaust treatment component to the evaporator. Such a valve member may, in said second position, be configured to direct exhaust gases from the evaporator to the exhaust treatment component and from the exhaust treatment component to a downstream exhaust line section. Such a valve member also has several tasks. As a consequence, a valve arrangement including this valves member may include few further valve members.
- According to an embodiment of the invention, the control system comprises a temperature sensor configured to sense the temperature of the exhaust gases in an upstream exhaust line section. In this case, the control unit receives information about the temperature of the exhaust gases which are led towards the exhaust treatment component and the evaporator. In view of this information, it is possible to adjust said specific temperature. Alternatively or in combination, the control system may comprise a sensor configured to sense the pressure or the temperature of the working medium in the WHR system. In order to provide an efficient operation of the WHR system, it is, for example, important to control the cooling of the working medium in a condenser of the WHR system. The cooling demand of the working medium is related to the absorption of heat in the evaporator.
- According to an embodiment of the invention, the exhaust treatment component is a SCR catalyst. The ability of a SCR catalyst to reduce nitrogen oxides decreases above a temperature of about 450° C. Thus, it is suitable to use the control system for controlling the temperature of a SCR catalyst. Alternatively or in combination, the exhaust treatment component may include an oxidation catalytic converter DOC, a particulate filter DPF, or an ammonia slip catalytic converter ASC.
- According to an embodiment of the invention, the valve arrangement comprises a valve member or valve part configured to change flow direction of the working medium in the evaporator. In certain cases, the exhaust gas flow may be directed through the evaporator in an opposite directions when the valve arrangement is in the first position or in the second position. In this case, it is also favorable to change the direction of the working medium flow through the evaporator in order to favor the heat transfer in the evaporator. This valve member may be a part of a valve member controlling the exhaust gas flow.
- The above mentioned object is also achieved by the claimed method.
- In the following preferred embodiments of the invention are described, as examples, with reference to the attached drawings, in which:
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FIG. 1 shows a control system with a valve arrangement according to a first embodiment of the invention where the valve arrangement is in a first position, -
FIG. 2 shows the valve arrangement inFIG. 1 in a second position. -
FIG. 3 shows an alternative embodiment of the valve arrangement in a first position, -
FIG. 4 shows the valve arrangement inFIG. 3 in a second position, -
FIG. 5 shows a further alternative embodiment of the valve arrangement in a first position, and -
FIG. 6 shows the valve arrangement inFIG. 5 in a second position. -
FIG. 1 shows a schematically disclosedvehicle 1 powered by asupercharged combustion engine 2. Thecombustion engine 2 may be a diesel engine. Thevehicle 1 may be a heavy vehicle. Thevehicle 1 comprises anexhaust line 3 receiving exhaust gases from thecombustion engine 2. Theexhaust line 3 comprises a turbine 4 of a turbo aggregate. The exhaust gases in theexhaust line 3 receive a reduced pressure and a reduced temperature when they expand through theturbine 4 a of a turbo charger 4. A number of schematically disclosedexhaust treatment components 5 are arranged in theexhaust line 3 in a position downstream of theturbine 4 a. Theexhaust treatment components 5 may, for example, include one or several of the following exhaust treatment components namely an oxidation catalytic converter DOC, a particulate filter DPF, a SCR catalytic converter and an ammonia slip catalytic converter ASC. The efficiency of eachexhaust treatment component 5 depends on its temperature. An efficient operating temperature of such exhaust treatment components are usually above 200° C. The ability of the SCR catalyst 6 to reduce nitrogen oxides may be optimal within the temperature range 300-450° C. At higher and lower temperatures the capacity of the SCR catalyst to reduce nitrogen oxides is reduced. - A temperature sensor 6 senses the temperature of the exhaust gases in an
exhaust line section 3 a located upstream of theexhaust treatment components 5 and an evaporator 7 of a WHR system. The upstreamexhaust line section 3 a comprises afirst valve member 8 and asecond valve 9. Acontrol unit 10 controls thefirst valve member 8 and asecond valve 9. Atemperature sensor 11 senses the temperature of the at least one of theexhaust treatment components 5. Theexhaust line 3 has anintermediate exhaust line 3 b arranged between theexhaust treatment component 5 and the evaporator 7. Anexhaust line section 3 c is located downstream of theexhaust treatment component 5 and the evaporator 7. Theturbine 4 a drives acompressor 4 b of the turbo charger 4. Thecompressor 4 b compresses air which is led, via a chargedair line 12 to thecombustion engine 2. The chargedair line 12 comprises acharge air cooler 13 arranged at a front portion of thevehicle 1. - The
combustion engine 2 is cooled by a cooling system with a circulating coolant. The cooling system comprises anengine inlet line 14 provided with acoolant pump 15 circulating the coolant in the cooling system. Anengine outlet line 16 receives the coolant leaving thecombustion engine 2. Athermostat 17 is arranged at an end of theengine outlet line 16. In case the coolant has a lower temperature than the regulating temperature of thethermostat 17, the coolant is directed back to thecoolant pump 15 via abypass line 18. In case the coolant has a higher temperature than the regulating temperature of thethermostat 17, the coolant is directed to aradiator 19 arranged at a front portion of thevehicle 1 in a position behind thecharge air cooler 13. Theradiator fan 20 and ram air provide a cooling air flow through thecharge air cooler 13 and theradiator 19. The coolant that has circulated through theradiator 19, it is directed, via aradiator outlet line 21, back to theengine inlet line 14 and thecoolant pump 15. The cooling system comprises a loop. The loop comprises acoolant inlet line 22 receiving coolant from thebypass line 18 or theradiator outlet line 21 depending on the position of thethermostat 17. Theinlet line 22 leads coolant to acondenser 23. The loop comprises anoutlet line 24 leading the coolant from thecondenser 23 to theengine inlet line 14 and thecoolant pump 15. - The vehicle is provided with a WHR-system (Waste Heat Recovery system). The WHR system comprises a
pump 25 which pressurizes and circulates a working medium. The working medium may be ethanol, R245fa or other kind of working medium. Thepump 25 pressurizes and circulates the working medium, via anevaporator inlet line 26, to the evaporator 7. The working medium is heated in the evaporator 7 by exhaust gases to a temperature at which it evaporates. The working medium is directed from the evaporator 7, via anexpander inlet line 27, to anexpander 28. Athird valve member 37 is arranged in contact with theevaporator inlet line 26 and theevaporator outlet line 27. Thethird valve member 37 is settable in a first position in which it directs the working medium in one direction through the evaporator 7 and in a second position in which it directs the working medium in an opposite direction through the evaporator 7. The pressurized and heated working medium expands in theexpander 28. Theexpander 28 generates a rotary motion which may be transmitted, via a suitable mechanical transmission, to a shaft of the drive train of thevehicle 1. Alternatively, theexpander 28 may be connected to a generator transforming mechanical energy into electrical energy. The electrical energy may be stored in e.g. a battery. After the working medium has passed through theexpander 28, it is directed, via anexpander outlet line 29 to thecondenser 23. The working medium is cooled in thecondenser 23 by the coolant in theloop condenser 23, via acondenser outlet line 30, to areceiver 31. Working medium sucks, via aninlet line 32 from thereceiver 31, to thepump 25. - During operation of the
combustion engine 2, thecontrol unit 10 receives substantially continuously information from thesensor 11 about the temperature of theexhaust treatment component 5. The control unit 6 may also receive information from the sensor 6 about the exhaust gas temperature in the upstreamexhaust line section 3 a and information from thesensor 33 about the temperature or the pressure of the working medium in the WHR system. Thecontrol unit 10 verifies if the temperature of theexhaust treatment component 5 is higher than a specific temperature. The specific temperature may be an upper temperature of a temperature range at which theexhaust treatment component 5 provides a substantially optimal treatment of the exhaust gases. The specific temperature may be a constant temperature or a temperature varying with other operating parameters such as the temperature of the exhaust gases in the upstreamexhaust line section 3 a or the temperature/pressure of the working medium in the WHR system. - During operating conditions when the
exhaust treatment component 5 has a lower temperature than a predetermined operating temperature, thecontrol unit 10 initiate a movement of thefirst valve member 8, thesecond valve member 9 and thethird valve member 37 to a first position which is shown inFIG. 1 . In this case, thefirst valve member 8 and thesecond valve member 9 direct the exhaust gases from the upstreamexhaust line section 3 a to thetreatment component 5. In this case, the exhaust gases may heat thetreatment component 5. The exhaust gases leave theexhaust treatment component 5 and enter theintermediate exhaust line 3 b. Thesecond valve member 9 directs the exhaust gases from theintermediate exhaust line 3 b of theexhaust line 3 to the evaporator 7. The exhaust gases heat the working medium in the evaporator 7 which flows in an opposite direction through the evaporator 7. The exhaust gases leaving the evaporator 7 are directed to the downstreamexhaust line section 3 c by thefirst valve member 8. Consequently, thefirst valve member 8 and thesecond valve member 9 direct the exhaust gases to theexhaust treatment component 5 before they are directed to the evaporator 7 when they are in the first position. - During operating conditions when the
treatment component 5 have a higher temperature than the predetermined operating temperature, thecontrol unit 10 initiates a movement of thefirst valve member 8 and the second valve member to a second position which is seen inFIG. 2 . In this case, thefirst valve member 8 and thesecond valve member 9 direct the exhaust gases from the upstreamexhaust line section 3 a to the evaporator 7. The exhaust gases are cooled down in the evaporator 7 by the working medium which also in this case flows in an opposite direction through the evaporator 7. The exhaust gases leaving the evaporator 7 are directed to theexhaust treatment component 5 by thesecond valve member 9. In this case, the exhaust gases have a lower temperature than the temperature of theexhaust treatment component 5. Consequently, the exhaust gases cool theexhaust treatment component 5. The exhaust gases leaving theexhaust treatment component 5 are directed to the downstreamexhaust line section 3 c by means of thesecond valve member 9 and thefirst valve member 8. Thefirst valve member 8 and thesecond valve member 9 direct the exhaust gases to the evaporator 7 before they are directed to theexhaust treatment component 5. In this case, it is possible to cool theexhaust treatment component 5 to a lower temperature at which they are able to provide a substantially optimal treatment of the exhaust gases. Furthermore, the exhaust gases entering the evaporator 7 may have a higher temperature which improves the efficiency of the WHR system. -
FIGS. 3 and 4 shows an alternative embodiment of the valve arrangement. The embodiment corresponds to the embodiment show inFIGS. 1 and 2 except the existence of anadditional valve portion 9a of thesecond valve member 9. When thevalve members FIG. 1 , the exhaust gases flow and the working medium in the WHR system are directed in the same direction through the evaporator 7. In this case, the evaporator 7 works as a parallel flow heat exchanger. When thevalve members FIG. 2 , the exhaust gas flow and the working medium flow are directed in opposite directions through the evaporator 7. The evaporator 7 works as a counter flow heat exchanger. A counter flow heat exchanger has usually a higher efficiency than a parallel heat exchanger. In order to remedy the drawback with a parallel heat exchanger, thesecond valve member 9 is provided with the above mentionedvalve portion 9a which makes it possible to change flow direction of the working medium in the evaporator 7.FIG. 3 shows thevalve portion 9 in the first position in which it changes direction of the working medium flow through the evaporator 7.FIG. 4 shows thevalve portion 9 in the second position in which it does not change the direction of the working medium flow through the evaporator 7. -
FIGS. 5 and 6 show a further embodiment of the valve arrangement. In this case, athird valve member 34 is configured to alternatively direct the exhaust gas flow from the upstreamexhaust line section 3 a to theexhaust treatment component 5 or the evaporator 7. A firstintermediate exhaust line 3 b 1 is able to direct exhaust gases from an outlet of theexhaust treatment component 5 to an inlet line of the evaporator 7. A secondintermediate exhaust line 3 b 2 is able to direct exhaust gases from an outlet line of the evaporator 7 to an inlet line of theexhaust treatment component 5. Afourth valve member 35 is configured to allow exhaust gas flow in one of theintermediate exhaust lines intermediate exhaust line fifth valve member 36 is configured to alternatively direct exhaust gases from theexhaust treatment component 5 or the evaporator 7 to the downstreamexhaust line section 3 c. - In case the
exhaust treatment component 5 has a lower temperature than the specific temperature, thecontrol unit 10 initiates a movement of thevalve members FIG. 5 . In this case, thethird valve member 34 directs the exhaust gas flow from the upstreamexhaust line section 3 a to theexhaust treatment component 5. The exhaust gas flow leaving theexhaust treatment component 5 is directed by thefourth valve member 35 to the evaporator 7. The exhaust gas flow leaving the evaporator 7 is directed by thefifth valve member 36 to the downstreamexhaust line section 3 c. In case theexhaust treatment component 5 has a higher temperature than the specific temperature, thecontrol unit 10 initiate a movement of thevalve members FIG. 6 . In this case, thethird valve member 34 directs the exhaust gas flow from the upstreamexhaust line section 3 a to the evaporator 7. The above mentioned design of the exhaust gas flow results in that the exhaust gases always flows in the same direction trough the evaporator 7. In this embodiment, it is not necessary change the flow direction of the working medium through the evaporator 7 in order to provide an exhaust flow and a working medium flow in opposite directions through the evaporator 7. The exhaust gas flow leaving the evaporator 7 is directed by thefourth valve member 35 to theexhaust treatment component 5. The exhaust gas flow leaving theexhaust treatment component 5 is directed by thefifth valve member 36 to the downstreamexhaust line section 3 c. - The invention is not restricted to the described embodiment but may be varied freely within the scope of the claims.
Claims (18)
1. A control system for controlling exhaust flow in an exhaust line of a combustion engine, wherein the exhaust line comprises at least one exhaust treatment component and an evaporator of a waste heat recovery system, and wherein the control system comprises:
a valve arrangement in the exhaust line;
a temperature sensor configured to sense a temperature related to a temperature of the exhaust treatment component; and
a control unit configured to position the valve arrangement in a first position, when the exhaust treatment component has a lower temperature than a specific temperature of exhaust gases that are directed to flow through the exhaust treatment component before being directed to flow through the evaporator, and to position the valve arrangement in a second position, when the exhaust treatment component has a higher temperature than a specific temperature of the exhaust gases that are directed to flow through the evaporator before being directed to flow through the exhaust treatment component,
wherein the valve arrangement comprises a valve member or a valve part configured to change flow direction of a working medium in the evaporator, such that the working medium and the exhaust gases always flow in opposite directions through the evaporator.
2. A control system according to claim 1 , wherein the valve arrangement comprises a valve member configured to alternatively direct the exhaust gases from an upstream exhaust line section to either the exhaust treatment component or to the evaporator.
3. A control system according to claim 1 , wherein the exhaust line comprises:
at least one intermediate exhaust line configured to direct exhaust gases between the exhaust treatment component and the evaporator; and
a valve member configured to control exhaust gas flow through the intermediate exhaust line.
4. A control system according to claim 1 , wherein the valve arrangement comprises a valve member configured to alternatively direct exhaust gases from either the exhaust treatment component or the evaporator to a downstream exhaust line section.
5. A control system according to claim 1 , wherein the valve arrangement comprises a valve member which, in said first position, is configured to direct exhaust gases from an upstream exhaust line section to the exhaust treatment component and exhaust gases from the evaporator to a downstream exhaust line section.
6. A control system according to claim 5 , wherein said valve member is, in said second position, configured to direct exhaust gases from the upstream exhaust line section to the evaporator and exhaust gases from the exhaust treatment component to the downstream exhaust line section.
7. A control system according to claim 1 , wherein the valve arrangement comprises a valve member which, in said first position, is configured to direct exhaust gases from an upstream exhaust line section to the exhaust treatment component and exhaust gases from the exhaust treatment component to the evaporator.
8. A control system according to claim 7 , wherein said valve member is, in said second position, configured to direct exhaust gases from the evaporator to the exhaust treatment component and exhaust gases from the exhaust treatment component to a downstream exhaust line section.
9. A control system according to claim 1 , further comprising a temperature sensor configured to sense the temperature of the exhaust gases in an upstream exhaust line section.
10. A control system according to claim 1 , further comprising a sensor configured to sense a pressure or a the temperature of the working medium in the waste heat recovery system.
11. A control system according to claim 1 , wherein the exhaust treatment component is a selective catalytic reduction catalyst.
12. A vehicle comprising a control system for controlling exhaust flow in an exhaust line of a combustion engine, wherein the exhaust line comprises at least one exhaust treatment component and an evaporator of a waste heat recovery system, and wherein the control system comprises:
a valve arrangement in the exhaust line;
a temperature sensor configured to sense a temperature related to a temperature of the exhaust treatment component; and
a control unit configured to position the valve arrangement in a first position, when the exhaust treatment component has a lower temperature than a specific temperature of exhaust gases that are directed to flow through the exhaust treatment component before being directed to flow through the evaporator, and to position the valve arrangement in a second position, when the exhaust treatment component has a higher temperature than a specific temperature of the exhaust gases that are directed to flow through the evaporator before being directed to flow through the exhaust treatment component,
wherein the valve arrangement comprises a valve member or a valve part configured to change flow direction of a working medium in the evaporator, such that the working medium and the exhaust gases always flow in opposite directions through the evaporator.
13. A method for controlling the exhaust flow in an exhaust line of a combustion engine in a vehicle, wherein the exhaust line comprises at least one exhaust treatment component and an evaporator of a waste heat recovery, a valve arrangement, wherein said method comprises:
directing exhaust gases in the exhaust line to flow through the exhaust treatment component before being directed to flow through the evaporator, when the exhaust treatment component has a lower temperature than a specific temperature;
directing the exhaust gases to flow through the evaporator before being directed to flow through the exhaust treatment component, when the exhaust treatment component has a higher temperature than said specific temperature; and
changing flow direction of a the working medium in the evaporator, such that the working medium and the exhaust gases always flow in opposite directions through the evaporator.
14. A vehicle according to claim 12 , wherein the valve arrangement comprises a valve member configured to alternatively direct the exhaust gases from an upstream exhaust line section to either the exhaust treatment component or to the evaporator.
15. A vehicle according to claim 12 , wherein the exhaust line comprises:
at least one intermediate exhaust line configured to direct exhaust gases between the exhaust treatment component and the evaporator; and
a valve member configured to control exhaust gas flow through the intermediate exhaust line.
16. A vehicle according to claim 12 , wherein the valve arrangement comprises a valve member configured to alternatively direct exhaust gases from either the exhaust treatment component or the evaporator to a downstream exhaust line section.
17. A method according to claim 13 further comprising alternatively directing the exhaust gases from an upstream exhaust line section to either the exhaust treatment component or to the evaporator.
18. A method according to claim 13 further comprising alternatively directing exhaust gases from either the exhaust treatment component or the evaporator to a downstream exhaust line section.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE1650345A SE542063C2 (en) | 2016-03-15 | 2016-03-15 | A control system and a method for controlling the exhaust gas flow in an exhaust line of a combustion engine |
SE1650345-0 | 2016-03-15 | ||
PCT/SE2017/050249 WO2017160214A1 (en) | 2016-03-15 | 2017-03-15 | A control system and a method for controlling the exhaust gas flow in an exhaust line of a combustion engine |
Publications (1)
Publication Number | Publication Date |
---|---|
US20190101038A1 true US20190101038A1 (en) | 2019-04-04 |
Family
ID=59852037
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/083,326 Abandoned US20190101038A1 (en) | 2016-03-15 | 2017-03-15 | A control system and a method for controlling the exhaust gas flow in an exhaust line of a combustion engine |
Country Status (4)
Country | Link |
---|---|
US (1) | US20190101038A1 (en) |
DE (1) | DE112017000871T5 (en) |
SE (1) | SE542063C2 (en) |
WO (1) | WO2017160214A1 (en) |
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US7246487B2 (en) * | 2002-11-19 | 2007-07-24 | Calsonic Kansei Corporation | Exhaust-heat recovery system for engine |
US20090308059A1 (en) * | 2008-06-17 | 2009-12-17 | Denso Corporation | Catalyst warming-up control device |
US20140352303A1 (en) * | 2013-05-31 | 2014-12-04 | GM Global Technology Operations LLC | Waste heat recovery system with integrated hydrocarbon adsorber, and method thereof |
US9109481B2 (en) * | 2012-05-24 | 2015-08-18 | Ford Global Technologies, Llc | Method to control and diagnose an exhaust gas heat exchanger |
US9328632B2 (en) * | 2011-09-30 | 2016-05-03 | Nissan Motor Co., Ltd. | Rankine cycle |
US20170350361A1 (en) * | 2016-06-07 | 2017-12-07 | Toyota Jidosha Kabushiki Kaisha | Exhaust heat recovery system |
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FR2769666B1 (en) * | 1997-10-10 | 1999-12-24 | Valeo Thermique Moteur Sa | EXHAUST SYSTEM FOR A MOTOR VEHICLE ENGINE |
JP5195381B2 (en) * | 2008-12-11 | 2013-05-08 | 株式会社デンソー | Exhaust heat recovery device |
US8893495B2 (en) * | 2012-07-16 | 2014-11-25 | Cummins Intellectual Property, Inc. | Reversible waste heat recovery system and method |
SE538389C2 (en) * | 2012-08-22 | 2016-06-07 | Scania Cv Ab | Exhaust |
-
2016
- 2016-03-15 SE SE1650345A patent/SE542063C2/en unknown
-
2017
- 2017-03-15 DE DE112017000871.9T patent/DE112017000871T5/en active Pending
- 2017-03-15 WO PCT/SE2017/050249 patent/WO2017160214A1/en active Application Filing
- 2017-03-15 US US16/083,326 patent/US20190101038A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US7246487B2 (en) * | 2002-11-19 | 2007-07-24 | Calsonic Kansei Corporation | Exhaust-heat recovery system for engine |
US20090308059A1 (en) * | 2008-06-17 | 2009-12-17 | Denso Corporation | Catalyst warming-up control device |
US9328632B2 (en) * | 2011-09-30 | 2016-05-03 | Nissan Motor Co., Ltd. | Rankine cycle |
US9109481B2 (en) * | 2012-05-24 | 2015-08-18 | Ford Global Technologies, Llc | Method to control and diagnose an exhaust gas heat exchanger |
US20140352303A1 (en) * | 2013-05-31 | 2014-12-04 | GM Global Technology Operations LLC | Waste heat recovery system with integrated hydrocarbon adsorber, and method thereof |
US20170350361A1 (en) * | 2016-06-07 | 2017-12-07 | Toyota Jidosha Kabushiki Kaisha | Exhaust heat recovery system |
Also Published As
Publication number | Publication date |
---|---|
SE542063C2 (en) | 2020-02-18 |
WO2017160214A1 (en) | 2017-09-21 |
SE1650345A1 (en) | 2017-09-16 |
DE112017000871T5 (en) | 2018-11-15 |
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