GB2561871A - Exhaust heat management system - Google Patents

Exhaust heat management system Download PDF

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Publication number
GB2561871A
GB2561871A GB1706620.0A GB201706620A GB2561871A GB 2561871 A GB2561871 A GB 2561871A GB 201706620 A GB201706620 A GB 201706620A GB 2561871 A GB2561871 A GB 2561871A
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United Kingdom
Prior art keywords
cooler
gases
exhaust
egr
heat management
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB1706620.0A
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GB201706620D0 (en
GB2561871B (en
Inventor
Winstanley Tim
Edward Caine Jon
Ewen Ken
Penzato Sam
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ford Global Technologies LLC
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Ford Global Technologies LLC
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Priority to GB1706620.0A priority Critical patent/GB2561871B/en
Publication of GB201706620D0 publication Critical patent/GB201706620D0/en
Priority to DE102018109943.6A priority patent/DE102018109943A1/en
Publication of GB2561871A publication Critical patent/GB2561871A/en
Application granted granted Critical
Publication of GB2561871B publication Critical patent/GB2561871B/en
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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
    • 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
    • F01N13/0093—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 the purifying devices are of the same type
    • 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
    • F01N13/0097—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 the purifying devices are arranged in a single housing
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
    • F02G5/02—Profiting from waste heat of exhaust gases
    • 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
    • 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
    • F02M26/15—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 in relation to engine exhaust purifying apparatus
    • 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
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • 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
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/24—Layout, e.g. schematics with two or more coolers
    • 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
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/25—Layout, e.g. schematics with coolers having bypasses
    • 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
    • F01N2260/02—Exhaust treating devices having provisions not otherwise provided for for cooling the device
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/22—Inlet and outlet tubes being positioned on the same side of the apparatus
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

An exhaust heat management system comprises an inlet 12 to introduce exhaust gases requiring heat management into the system and a first cooler 16 that provides cooling for exhaust gas recirculation (EGR) and exhaust waste heat recovery (EWHR). An outlet 20 positioned immediately downstream of the first cooler removes EGR gases from the system. A second cooler 18 provides cooling for EWHR only. An outlet 14 downstream from the second cooler removes EWHR gases from the system. There may be a cooler bypass 24 with a cooler bypass valve 22. The first and second coolers may be arranged in a side-by-side configuration or an in-line configuration. A valve may selectively control passage of exhaust gases from the first cooler through the outlet immediately downstream or through the second cooler. The EGR gases may be re-introduced into a vehicle engine at low pressure and downstream of an air intake filter.

Description

(54) Title of the Invention: Exhaust heat management system Abstract Title: Exhaust heat management system (57) An exhaust heat management system comprises an inlet 12 to introduce exhaust gases requiring heat management into the system and a first cooler 16 that provides cooling for exhaust gas recirculation (EGR) and exhaust waste heat recovery (EWHR). An outlet 20 positioned immediately downstream of the first cooler removes EGR gases from the system. A second cooler 18 provides cooling for EWHR only. An outlet 14 downstream from the second cooler removes EWHR gases from the system. There may be a cooler bypass 24 with a cooler bypass valve 22. The first and second coolers may be arranged in a side-by-side configuration or an in-line configuration. A valve may selectively control passage of exhaust gases from the first cooler through the outlet immediately downstream or through the second cooler. The EGR gases may be re-introduced into a vehicle engine at low pressure and downstream of an air intake filter.
Figure GB2561871A_D0001
Fig. 1 >
1/1
Figure GB2561871A_D0002
Fig. 1
Figure GB2561871A_D0003
Fig. 2
EXHAUST HEAT MANAGEMENT SYSTEM
This invention relates to an exhaust heat management system.
Exhaust Gas Recirculation (EGR) is used to control the emission of nitrogen oxides, commonly referred to as NOX, that are produced by vehicle engines. NOX is produced by an endothermic reaction between oxygen and nitrogen at high temperatures such as those experienced within an internal combustion engine.
Control of NOXemissions is desirable due to NOX contributing to formation of smog and acid rain and causing damage to ozone. Most developed nations require vehicle emissions to meet certain criteria in order to minimise the environmental impact of NOX as far as is possible.
EGR at its basic level involves recirculating a portion of an engine’s exhaust gas through a cooler and back into the engine. This process requires the exhaust gas to be cooled before it can be introduced back into the engine. Typically a liquid-to-water heat exchanger is used to transfer heat energy from the exhaust gas to the engine coolant. When the exhaust gas is introduced back into the engine it aids reduction of the temperature of the engine combustion chamber and depending on the nature of the engine either displaces the amount of combustible matter or oxygen within the combustion chamber. The EGR process is used in most modern internal combustion engines and is effective to reduce the amount of NOX produced.
Some vehicles also utilise Exhaust Waste Heat Recovery (EWHR), sometimes also referred to as Exhaust Heat Recovery (EHR) or Exhaust Gas Heat Recovery (EGHR). EWHR utilises heat from a vehicle’s exhaust system to turn thermal losses into usable energy. EWHR systems are optimised to accelerate the warm-up of a vehicle’s coolant circuit upon start-up the vehicle’s engine. Such systems reduce the time it takes the engine to warm up to optimal temperature. This is desirable as vehicle engines are less efficient below their normal operating temperature. Speeding up the process of engine warm up also reduces the time before the vehicle cabin can be effectively heated using the occupancy heating system.
The use of separate EGR and EWHR systems requires a complicated exhaust gas flow path to accommodate the differing temperature requirements of the EGR and EWHR systems. Solutions are typically expensive in terms of cost against benefit and add significant weight to the overall weight of the vehicle. To overcome the cost and weight disadvantages of separate EGR and EWHR systems, some vehicle manufacturers have implemented combined systems. However, because of limitations on the available space envelope, it is common practice to give priority to either the EGR function or the EWHR function to keep the size and weight of the combined system as low as possible.
Prioritisation of the EGR function results in a cooler sized to avoid over cooling the EGR gases. Use of a smaller cooler can result in a less than optimal EWHR function and thus a longer coolant warm up time. Prioritisation of the EWHR function results in a larger cooler that is sized to allow for maximised exhaust heat recovery. A larger cooler can cause the exhaust gases to be overcooled thus risking formation of condensate within the combustion chamber. Condensate within the combustion chamber is a major cause of combustion instability and can potentially cause engine/turbo charger damage. Separate EGR systems are designed in such a way to reduce the risk of such an occurrence. In a combined system, use of a larger cooler constrains the window of EGR operation and thus reduces the benefit of the EGR function.
The present invention seeks to address the aforementioned problems and provide an improved exhaust heat management system that has the benefits of both an EGR function and an EWHR function.
According to the present invention there is provided an exhaust heat management system comprising: an inlet configured to introduce exhaust gases requiring heat management into the system; a first cooler configured to provide cooling for EGR and EWHR; an outlet positioned immediately downstream of the first cooler and configured to remove EGR gases from the system; a second cooler configured to provide cooling for EWHR only; and an outlet downstream from the second cooler configured to remove EWHR gases from the system.
Use of a two-stage cooling solution enables independent coolers to be selected for both of the EGR and EWHR functions in a combined package. The cooler for the EGR function can be optimised to cool the exhaust gases to a level that reduces the temperature of the combustion chamber without forming condensation. The cooler for the EWHR function can be optimised to cool the exhaust gases through heat transfer into the engine coolant. The space envelope required by a combined system is smaller than for separate EGR and EWHR systems. EWHR efficiency is provided by the EWHR gases passing through both the first cooler and the second cooler.
In one embodiment, the first cooler and the second cooler are arranged in a side-by-side configuration.
Such a configuration facilitates a less complex exhaust gas route for the cooler bypass. The cooler bypass can pass linearly beneath or above the first and second cooler thus providing minimal obstruction between the inlet and outlet.
In another embodiment the first cooler and second cooler are arranged in an in-line configuration.
Such a configuration facilitates design of an exhaust heat management system that has an optimised longitudinal space envelope.
The system may further comprise a cooler bypass defined between the inlet and the outlet and a cooler bypass valve configured to selectively control passage of exhaust gases from the inlet through the first cooler and/or cooler bypass.
The cooler bypass valve, or EGR valve as it is commonly referred to, when used in a conventional EGR system is typically closed to provide full engine performance and open to control reduction of NOX content in exhaust gases. Engine performance is reduced when the EGR valve is open. Reduction in performance is mitigated in the present invention by the combined EGR and EWHR function such that when the valve is open, heat energy, in some embodiments, is transferred back to the engine by the engine coolant.
The system may further comprise a valve configured to selectively control passage of exhaust gases from the first cooler through the outlet positioned immediately downstream of the first cooler and/or through the second cooler.
Depending on the engine temperature, it may be desirable for the ECU to control the proportion of exhaust gases being introduced back into the engine. For example, upon engine start up the exhaust gases will be at a relatively low temperature and could cause condensation within the combustion chamber. In order to warm the engine up more quickly it is also desirable that all exhaust gases are initially diverted through the first and second coolers to draw any heat from the exhaust gases into the engine coolant. Once the ECU determines that the engine coolant is at a certain temperature, the valve is opened to permit a proportion of the exhaust gases to be introduced back into the engine.
The EGR gases may be re-introduced into a vehicle engine at low pressure from the outlet positioned immediately downstream of the first cooler.
Use of a low pressure EGR system, particularly in a diesel engine, has a number of benefits over a comparable high pressure EGR system. For example, the EGR gases in a low pressure system are generally particulate free thus limiting contamination of the vehicle lubrication system with combustion residue. Low pressure systems also do not require the pressure of EGR gases to be modified prior to re-introduction into the vehicle engine due to the location of re-introduction being downstream of the air intake system.
The invention will now be further and more particularly described, by way of example only, and with reference to the accompanying drawings, in which:
Figure 1 shows a two-stage cooler in a “U-type” configuration according to an embodiment of the invention; and
Figure 2 shows a two-stage cooler in an “in-line” configuration according to another aspect of the invention.
A first embodiment of exhaust heat management system 10 is shown in Figure 1. The system is provided as part of a vehicle exhaust system and comprises an inlet 12 through which exhaust gases from the vehicle’s internal combustion engine are received and an outlet 14 through which exhaust gases can flow back into the vehicle exhaust system. A first cooler 16 and second cooler 18 are arranged in a side-by-side configuration between the inlet 12 and outlet 14 to define a U-shaped exhaust gas flow path.
An inter-stage outlet valve 20 is positioned between the first cooler 16 and second cooler 18 to enable a proportion of the exhaust gases to be introduced back into the vehicle engine following cooling by the first cooler 16. The inter-stage outlet valve 20 is a variable valve configured to enable the vehicle Engine Control Unit (ECU) to control the proportion of exhaust gases that enter the second cooler 18.
The first cooler 16 is sized and configured to transfer heat energy from the exhaust gases into the engine coolant thus reducing the temperature of the exhaust gases prior to introduction back into the engine combustion chamber. The first cooler 16 is selected such that the exhaust gases introduced back into the engine are not overcooled. The second cooler 18 is sized and configured to transfer heat energy from the exhaust gases into the engine coolant thus increasing the temperature ofthe engine coolant and minimising energy wastage through direct heat loss.
The system 10 further comprises a cooler bypass valve 22 that is variable to control the proportion of exhaust gases that are permitted to enter the first cooler 16. When the cooler bypass valve 22 is completely closed, all exhaust gases flow directly from the inlet 12 to the outlet 14 through a cooler bypass 24. When the cooler bypass valve 22 is completely open, all exhaust gases flow from the inlet into the first cooler 16 and onwards to the inter-stage outlet valve 20 and second cooler 18 as required. When the cooler bypass valve 22 is partially open, exhaust gases flow from the inlet 12 to the first cooler 16 and through the cooler bypass 24 in proportions determined by the position of the bypass valve 22.
A second embodiment of exhaust heat management system 10 is shown in Figure 2. All components are the same as per the first embodiment described with reference to Figure 1. The second embodiment differs in that the first cooler 14 and second cooler 16 are arranged in an in-line configuration to define a linear flow through gas flow path.
The described embodiments are applicable to both low pressure and high pressure EGR systems. Low pressure EGR systems re-circulate EGR gases between two low pressure points, i.e. between a vehicle’s exhaust system and turbo charger inlet. In a high pressure system the EGR gases are re-circulated between two high pressure points, i.e. a vehicle’s exhaust manifold and inlet manifold.
It will further be appreciated by those skilled in the art that although the invention has been described by way of example with reference to several embodiments it is not limited to the disclosed embodiments and that alternative embodiments could be constructed without departing from the scope of the invention as defined in the appended claims.

Claims (7)

1. An exhaust heat management system comprising: an inlet configured to introduce exhaust gases requiring heat management into the system; a first cooler configured to
5 provide cooling for EGR and EWHR; an outlet positioned immediately downstream of the first cooler and configured to remove EGR gases from the system; a second cooler configured to provide cooling for EWHR only; and an outlet downstream from the second cooler configured to remove EWHR gases from the system.
2. An exhaust heat management system according to claim 1, wherein the first cooler
10 and second cooler are arranged in a side-by-side configuration.
3. An exhaust heat management system according to claim 1, wherein the first cooler and second cooler are arranged in an in-line configuration.
4. An exhaust heat management system according to any preceding claim further comprising a cooler bypass defined between the inlet and the outlet and a cooler bypass
15 valve configured to selectively control passage of exhaust gases from the inlet through the first cooler and/or cooler bypass.
5. An exhaust heat management system according to any preceding claim further comprising a valve configured to selectively control passage of exhaust gases from the first cooler through the outlet positioned immediately downstream of the first cooler and/or
20 through the second cooler.
6. An exhaust heat management system according to any preceding claim wherein the EGR gases are re-introduced into a vehicle engine at low pressure from the outlet positioned immediately downstream of the first cooler.
7. An exhaust heat management system according to claim 6, wherein the EGR gases
25 are re-introduced into the vehicle engine downstream of an air intake filter.
Intellectual
Property
Office
Application No: GB1706620.0 Examiner: Rachel Smith
GB1706620.0A 2017-04-26 2017-04-26 Exhaust heat management system Expired - Fee Related GB2561871B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1706620.0A GB2561871B (en) 2017-04-26 2017-04-26 Exhaust heat management system
DE102018109943.6A DE102018109943A1 (en) 2017-04-26 2018-04-25 Exhaust heat management system

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Application Number Priority Date Filing Date Title
GB1706620.0A GB2561871B (en) 2017-04-26 2017-04-26 Exhaust heat management system

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GB201706620D0 GB201706620D0 (en) 2017-06-07
GB2561871A true GB2561871A (en) 2018-10-31
GB2561871B GB2561871B (en) 2019-08-14

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009071972A1 (en) * 2007-12-04 2009-06-11 Toyota Jidosha Kabushiki Kaisha Internal combustion engine
GB2473821A (en) * 2009-09-23 2011-03-30 Gm Global Tech Operations Inc Exhaust gas recirculation system with multiple coolers
WO2013046783A1 (en) * 2011-09-26 2013-04-04 株式会社豊田自動織機 Waste heat recovery system
WO2017126117A1 (en) * 2016-01-22 2017-07-27 フタバ産業株式会社 Exhaust heat recovery device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009071972A1 (en) * 2007-12-04 2009-06-11 Toyota Jidosha Kabushiki Kaisha Internal combustion engine
GB2473821A (en) * 2009-09-23 2011-03-30 Gm Global Tech Operations Inc Exhaust gas recirculation system with multiple coolers
WO2013046783A1 (en) * 2011-09-26 2013-04-04 株式会社豊田自動織機 Waste heat recovery system
WO2017126117A1 (en) * 2016-01-22 2017-07-27 フタバ産業株式会社 Exhaust heat recovery device

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GB201706620D0 (en) 2017-06-07
DE102018109943A1 (en) 2018-10-31
GB2561871B (en) 2019-08-14

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