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WO2017018957A1 - Procédé et système de refroidissement de recirculation des gaz d'échappement - Google Patents

Procédé et système de refroidissement de recirculation des gaz d'échappement Download PDF

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Publication number
WO2017018957A1
WO2017018957A1 PCT/TR2016/050238 TR2016050238W WO2017018957A1 WO 2017018957 A1 WO2017018957 A1 WO 2017018957A1 TR 2016050238 W TR2016050238 W TR 2016050238W WO 2017018957 A1 WO2017018957 A1 WO 2017018957A1
Authority
WO
WIPO (PCT)
Prior art keywords
coolant
egr
temperature
egr cooler
cooling system
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.)
Ceased
Application number
PCT/TR2016/050238
Other languages
English (en)
Inventor
Ferit Tayfur YILDIRIM
Anil DILER
Aydin BAYRAKTAR
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 Otomotiv Sanayi AS
Original Assignee
Ford Otomotiv Sanayi AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ford Otomotiv Sanayi AS filed Critical Ford Otomotiv Sanayi AS
Publication of WO2017018957A1 publication Critical patent/WO2017018957A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
    • 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
    • F02M26/33—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 controlling the temperature of the recirculated gases

Definitions

  • the present invention relates to an EGR cooling system and method which enables to keep the temperature of the coolant used in the EGR system at a desired temperature range, and which changes the flow rate of the coolant when the temperature of the coolant exceeds the desired temperature range.
  • EGR exhaust gas recirculation
  • the gases included into the combustion process do not burn in the engine; they reduce combustion temperature in the engine and prevent the harmful gases from being discharged from the exhaust system.
  • combustion temperature is reduced, and the generation of nitrogen oxide gas is decreased.
  • the amount of the gas to be circulated in EGR system is provided with EGR valve according to engine calibration targets, and generally poppet valve or butterfly valve is used.
  • the generation of nitrogen oxide (NOx) is reduced almost in ratio of 30-40% by means of the EGR system.
  • the exhaust gas generated as a result of combustion in the engine increases the density of the gas in the EGR system, and it is subjected to cooling in order to send more gas into the combustion chamber.
  • Cooling exhaust gas is provided with cooling exchanger present inside the EGR system.
  • exhaust gas EGR gas
  • the exhaust gas which is given to the engine suction by being cooled by means of the cooling exchanger is more condensed than the gases inside the engine, and nitrogen oxide (NOx) emission in the engine is decreased.
  • the cooling exchanger used in EGR systems are usually comprised of tubes and coolant such as water enabling cooling by passing around the tubes.
  • EGR exhaust gas passes through the tubes, and water passes around the tubes, and thus water cools the surface of the surface, thereby cooling the gas passing through the tubes.
  • cooling is provided with engine coolant.
  • the surrounding of the cooling tubes is covered with engine coolant. Therefore, a heat flow from the gas passing through the tube towards the engine coolant is provided, and thus exhaust gas is cooled. While the exhaust gas is being cooled, the coolant is heated.
  • exhaust gas flow rate is not the same at each point where the engine coolant passes, in some places the flow rate of the gas is more while the flow rate of the engine coolant is less.
  • the hot water passing on the cooling tubes and the deflector plates causes the stress level on the parts to increase, the temperatures of the metal to increase, even the tube and the deflector plates to break.
  • a malfunction or break in the EGR system causes the system to become unusable, the emission values to increase in an unwanted manner, and decrease in water level. The decrease in water level may cause the engine to be badly damaged, even become unusable. In case the said internal parts in the EGR system break, it is not possible to repair these parts, they should be replaced completely.
  • the cooling systems are placed sequentially along the exhaust pipe.
  • controlling the temperature of the coolant and changing the flow rate of the coolant is not disclosed.
  • the most obvious difference between the said patent document and the invention pf the present application is to measure the coolant temperature, and control the coolant temperature by changing the flowrate of the coolant.
  • the EGR system operates more efficiently, and the EGR system malfunctions and engine malfunctions due to overheating and boiling of the coolant by means of the said difference.
  • the Unites States patent document US6244256 discloses an EGR system having a second cooling system. Further cooling is provided by means of each cooling system having a separate radiator. There is no explanation in the said patent document about controlling the temperature of the coolant and controlling the coolant temperature by changing the flowrate of the coolant. The most obvious difference between the said patent document and the invention pf the present application is to measure the coolant temperature, and control the coolant temperature by changing the flowrate of the coolant.
  • the objective of the present invention is to provide an EGR cooling system and method which keeps the temperature of the coolant used in EGR system at a preferred range.
  • Another objective of the present invention is to provide an EGR cooling system and method which controls the temperature of the coolant used in EGR system by changing the flowrate of the coolant.
  • a further objective of the present invention is to provide an EGR cooling system and method which prevents EGR system malfunctions and engine malfunctions occurring due to boiling of the coolant.
  • the temperature and flowrate of the coolant used in EGR system is controlled by the EGR system and method.
  • the EGR cooling system operates by changing the flowrate of the coolant to be used in the system according to the temperature value of the coolant present in the EGR cooler.
  • the EGR cooling system controls the temperature of the coolant by changing the flowrate of the coolant.
  • a secondary liquid tank other than radiator is used.
  • the coolant present in the secondary tank is activated according to the temperature of the coolant present in the cooler. If the temperature of the coolant increases much, the liquid present in the secondary tank is included into the system and the flowrate of the coolant is increased, and thus the overheating of the coolant is prevented. Therefore, the EGR system operates more effectively with the coolants supplied by two different sources, and more effective cooling is provided.
  • Figure 1 is the schematic view of the EGR cooling system.
  • FIG. 1 is the flowchart of the EGR cooling method.
  • the components shown in the figures are each given reference numbers as follows:
  • EGR cooling method An EGR cooling system (1); which enables to keep the temperature of the coolant used in EGR systems of the vehicles at a preferred temperature range, and changes the flowrate of the coolant when the temperature of the coolant exceeds the preferred temperature range; comprises
  • At least one EGR valve (2) which enables exhaust gas to be received from the exhaust manifold (EG),
  • At least one EGR cooler (3) which cools the exhaust gas
  • At least one secondary tank (6) wherein the coolant is stored independent from the radiator (4), at least one secondary pump (7) which pumps the liquid in the secondary tank (6) to the EGR cooler (3),
  • flowrate control valve (8) which increases the flowrate of the coolant sending additional coolant to the EGR cooler (3) according to the temperature of the coolant.
  • the exhaust gas generated as a result of combustion occurring in the engine (M) is received from the exhaust manifold (EG) and subjected to cooling, and included into the combustion again by mixing into the combustion air through the intake manifold (EM).
  • the exhaust gas is preferably received from the exhaust manifold (EG).
  • the EGR valve (2) is turned on, and it is enabled that the exhaust gas in the exhaust manifold (EG) is included into the EGR cooling system (1).
  • the EGR valve (2) is turned off, and it is prevented that the exhaust gas in the exhaust manifold (EG) is included into the EGR cooling system (1).
  • the gas in the exhaust manifold (EG) is directed to the EGR cooler (3) via the EGR valve (2).
  • the EGR cooler (3) cools the exhaust gas by means of the coolant.
  • the EGR cooler (3) comprises cooling tubes through which the exhaust gas passes. The exhaust gas received from the exhaust manifold (EG) passes through the said cooling tubes, and the cooling tubes are cooled with the coolant.
  • liquids such as antifreeze are used as coolant.
  • At least one exhaust gas inlet, exhaust gas outlet, and at least one coolant inlet on the EGR cooler (3) there is preferably at least one exhaust gas inlet, exhaust gas outlet, and at least one coolant inlet on the EGR cooler (3).
  • the coolants are combined before entering into the EGR cooler (3).
  • the EGR cooler (3) has one coolant inlet.
  • One of the EGR cooler (3) inlets is connected to the radiator (4) line.
  • the coolant in the radiator (4) is transferred to the EGR cooler (3) via the water pump (5).
  • the coolant is initially taken from the radiator (4).
  • the EGR cooler (3) is started to be cooled with the coolant taken from the radiator (4). Cooling is performed with the liquid in the radiator (4) until the coolant is heated too much.
  • the secondary tank (6) is connected to the one of the inlets of the EGR cooler (3) which is not connected to the radiator (4).
  • the secondary tank (6) supplies coolant independent from the radiator (4).
  • the volume of the secondary tank (6) may vary according to the cooling capacity, engine type and size.
  • Preferably water is used as coolant in the secondary tank (6).
  • the coolant in the secondary tank (6) is transferred to the EGR cooler (3) via the secondary pump (7).
  • the secondary pump (7) is preferably connected to the secondary tank (6), and it is activated when an additional liquid is required for cooling and it preferably pumps water to the EGR cooler (3).
  • the secondary tank (6) and the secondary pump (7) are preferably connected to the EGR cooler (3) with a different link.
  • a flow rate control valve (8) provided between the secondary tank (6) and the EGR cooler (3).
  • the flow rate control valve (8) controls the passage of the coolant in the secondary tank (6) to the EGR cooler (3).
  • the flowrate control valve (8) preferably operates proportionally, and it allows liquid passage in different ratios.
  • the coolant in the secondary tank (6) After the coolant in the secondary tank (6) is used in the EGR cooler (39, it exits from the outlet line of the EGR cooler (3) and comes to the secondary tank (6) again according to the on-off position of the return valve (9). Therefore, coolant performs closed circulation. After it increases the flowrate of the coolant in the EGR cooler (3), it is stored in the secondary tank (6) again.
  • the return valve (9) turns the line between the EGR cooler (3) and the secondary tank (6) on and off, therefore it enables the coolant to complete its closed circuit circulation.
  • the inventive EGR cooling system (1) comprises at least one temperature sensor
  • the temperature sensor (10) is present in the EGR cooler (3) or at the EGR cooler (3) outlet.
  • the temperature of the coolant present in the EGR cooler (3) and the cooler (3) outlet is measured with the temperature sensor (10).
  • the temperature sensor (10) continuously measures temperature value and transfers this data wirelessly.
  • the inventive EGR cooling system (1) preferably comprises at least one control unit (11).
  • the control unit (11) controls the process of receiving exhaust gas and cooling exhaust gas.
  • the control unit (11) turns EGR valve (2), water pump (5), secondary pump (7), flowrate control valve (8) and the return valve (9) on and off, and thus enables the cooling to be at maximum efficiency and the preferred coolant temperature range.
  • the control unit (11) is adapted to control the coolant flowrate according to the coolant temperature value which it receives from the temperature value (10).
  • the control unit (11) transfers the liquid in the secondary tank (6) to the EGR cooler (3) according to the temperature value of the coolant, thereby increasing the flowrate of the coolant in the cooler (3).
  • the control unit (11) controls the process of receiving exhaust gas and cooling exhaust gas.
  • the control unit (11) turns EGR valve (2), water pump (5), secondary pump (7), flowrate control valve (8) and the return valve (9) on and off, and thus enables the cooling to be at maximum efficiency and the preferred coolant temperature range.
  • the control unit (11) is adapted to operate the secondary pump (7) and turn the flowrate control valve (8) when the temperature of the coolant exceeds the preferred values.
  • the control unit (11) turns on the return valve (9) when the coolant temperature reaches the preferred values, and transfers the coolant which it transfers to the EGR cooler (3) to the secondary tank (6) again.
  • the EGR cooling system (1) operates such that the temperature of the coolant inside the EGR coolant (3) will remain in the preferred range.
  • the EGR cooling system (1) provides the temperature of the coolant by controlling the flowrate of the coolant. For this, coolant is supplied to the system (1) with the secondary tank
  • the secondary pump (7) preferably has a drive motor, and it provides the power required to transfer the liquid.
  • the flowrate control valve (8) is turned on in order to transfer the coolant in the secondary tank (6) to the EGR cooler (3). Therefore, the liquid compressed by the secondary pump (7) is transferred to the EGR cooler (3), and the flowrate of the coolant inside the EGR cooler (3) is increased.
  • the return valve (9) is turned on the and the coolant added into the system (1) fills into the secondary tank (6) again. Therefore, the EGR cooling system (1) is cooled with the liquid taken from two different coolants.
  • the temperature of the coolant present inside the EGR cooler (3) is adjusted with the inventive EGR cooling method (100) by controlling the flowrate of the liquid. Therefore, cooling is performed by controlling the temperature value of the coolant.
  • the EGR cooling method (100) which controls the temperature of the coolant by changing the flowrate of the coolant according to the temperature value of the coolant comprises the steps of
  • the flowrate of the coolant is changed according to the temperature value of the coolant with the EGR cooling method (100), and thus the temperature of the coolant is kept under control.
  • the temperature of the coolant is measured by the temperature sensor (101). It is not wanted that the coolant reaches the boiling point. If the coolant temperature is raised and the boiling point is reached, the secondary pump (7) is operated according to the temperature value (102). At the same time, the flowrate control valve (8) is turned on (103). Therefore coolant from a different source other than the radiator (4) is transferred into the EGR cooler (3) (104).
  • the flowrate of the coolant inside the EGR cooler (3) is changed by transferring coolant into the EGR cooler (3) from an additional source (105).
  • the temperature value of the coolant is reduced (106).
  • the return valve (9) is turned on in order to pull the additional coolant back (107). Therefore, the additional coolant completes its closed circuit circulation, and it is transferred to the secondary tank (6) again (108).
  • the EGR cooling system (100) the temperature of the coolant in the EGR cooler (3) is continuously kept under control.
  • additional coolant is provided from a coolant source other than the radiator (4), and the flowrate of the coolant is increased. Therefore, cooling is provided with a cooling method (100) wherein the flowrate of the coolant is decreased and increased.

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  • 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

La présente invention concerne un système de refroidissement de recirculation des gaz d'échappement (1) et un procédé de refroidissement de recirculation des gaz d'échappement (100) qui permet de maintenir la température du liquide de refroidissement utilisé dans le système de recirculation des gaz d'échappement au sein d'une plage de température souhaitée, et qui change le débit du liquide de refroidissement lorsque la température du liquide de refroidissement ne se situe plus au sein de la plage de température souhaitée.
PCT/TR2016/050238 2015-07-27 2016-07-27 Procédé et système de refroidissement de recirculation des gaz d'échappement Ceased WO2017018957A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2015/09225 2015-07-27
TR2015/09225A TR201509225A2 (tr) 2015-07-27 2015-07-27 Egr soğutma si̇stemi̇ ve yöntemi̇

Publications (1)

Publication Number Publication Date
WO2017018957A1 true WO2017018957A1 (fr) 2017-02-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/TR2016/050238 Ceased WO2017018957A1 (fr) 2015-07-27 2016-07-27 Procédé et système de refroidissement de recirculation des gaz d'échappement

Country Status (2)

Country Link
TR (1) TR201509225A2 (fr)
WO (1) WO2017018957A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115217681A (zh) * 2022-07-29 2022-10-21 潍柴动力股份有限公司 Egr系统的控制方法、egr系统、车辆和存储介质

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6244256B1 (en) 1999-10-07 2001-06-12 Behr Gmbh & Co. High-temperature coolant loop for cooled exhaust gas recirculation for internal combustion engines
US7380544B2 (en) 2006-05-19 2008-06-03 Modine Manufacturing Company EGR cooler with dual coolant loop
WO2009128768A1 (fr) * 2008-04-18 2009-10-22 Scania Cv Ab Dispositif de refroidissement pour un moteur à combustion interne à suralimentation
GB2493741A (en) * 2011-08-17 2013-02-20 Gm Global Tech Operations Inc I.c. engine exhaust gas recirculation system with two-stage cooling
FR3002285A1 (fr) * 2013-02-20 2014-08-22 Renault Sa Systeme de recuperation de chaleur des gaz d'echappement dans un moteur a combustion interne, avec deux echangeurs de chaleur au niveau d'un circuit de recirculation de gaz
US20150107566A1 (en) * 2012-05-16 2015-04-23 Denso Corporation Exhaust gas recirculation device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6244256B1 (en) 1999-10-07 2001-06-12 Behr Gmbh & Co. High-temperature coolant loop for cooled exhaust gas recirculation for internal combustion engines
US7380544B2 (en) 2006-05-19 2008-06-03 Modine Manufacturing Company EGR cooler with dual coolant loop
WO2009128768A1 (fr) * 2008-04-18 2009-10-22 Scania Cv Ab Dispositif de refroidissement pour un moteur à combustion interne à suralimentation
GB2493741A (en) * 2011-08-17 2013-02-20 Gm Global Tech Operations Inc I.c. engine exhaust gas recirculation system with two-stage cooling
US20150107566A1 (en) * 2012-05-16 2015-04-23 Denso Corporation Exhaust gas recirculation device
FR3002285A1 (fr) * 2013-02-20 2014-08-22 Renault Sa Systeme de recuperation de chaleur des gaz d'echappement dans un moteur a combustion interne, avec deux echangeurs de chaleur au niveau d'un circuit de recirculation de gaz

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115217681A (zh) * 2022-07-29 2022-10-21 潍柴动力股份有限公司 Egr系统的控制方法、egr系统、车辆和存储介质
CN115217681B (zh) * 2022-07-29 2024-05-17 潍柴动力股份有限公司 Egr系统的控制方法、egr系统、车辆和存储介质

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