WO2012107960A1 - 排気還流装置 - Google Patents
排気還流装置 Download PDFInfo
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- WO2012107960A1 WO2012107960A1 PCT/JP2011/000759 JP2011000759W WO2012107960A1 WO 2012107960 A1 WO2012107960 A1 WO 2012107960A1 JP 2011000759 W JP2011000759 W JP 2011000759W WO 2012107960 A1 WO2012107960 A1 WO 2012107960A1
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- egr
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- exhaust
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/17—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
- F02M26/21—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 with EGR valves located at or near the connection to the intake system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/37—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with temporary storage of recirculated exhaust gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/39—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with two or more EGR valves disposed in series
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0406—Layout of the intake air cooling or coolant circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to an exhaust gas recirculation device that can suppress emission, that is, generation amount of nitrogen oxides, by adding a part of exhaust gas to intake air.
- EGR in which a part of the exhaust gas flowing in the exhaust passage is returned from the intake passage to the combustion chamber, and the combustion temperature of the air-fuel mixture in the combustion chamber is lowered, thereby reducing the ratio of nitrogen oxide in the exhaust gas.
- E xhaust G as R ecirculation exhaust gas recirculation
- an EGR control valve capable of opening and closing the EGR passage is provided in the middle of the EGR passage where both ends communicate with the intake passage and the exhaust passage, and exhaust gas is sent to the intake passage side in a predetermined operation region. Reflux.
- Patent Document 1 A technique for solving such a problem is proposed in Patent Document 1. That is, in the idle stop control, EGR gas is temporarily stored in the EGR passage when the internal combustion engine is stopped, and when the internal combustion engine is restarted, particularly for the first explosion cylinder in which the first supplied fuel burns. Gas can be supplied in addition to intake air.
- Patent Document 1 a heat exchanger for cooling and densifying the EGR gas is incorporated in the middle of the EGR passage. For this reason, uncooled exhaust gas is also temporarily stored in the EGR passage, which becomes a factor that hinders the density increase. In addition, when the exhaust is temporarily stored, moisture contained in the exhaust intervening in the heat exchanger condenses and reacts with the sulfur contained in the exhaust to corrode the heat exchanger as sulfuric acid. As a result, the product life of the heat exchanger is significantly shortened.
- An object of the present invention is to provide an exhaust gas recirculation device that can further increase the density of exhaust gas supplied to intake air when the internal combustion engine is temporarily stopped and then restarted. It is in. It is also included in the object of the present invention to provide an exhaust gas recirculation device that can suppress corrosion of the heat exchanger caused by condensation of moisture contained in the temporarily stored exhaust gas.
- one end communicates with an intake passage and the other end communicates with an exhaust passage, and an EGR passage for guiding a part of exhaust discharged from the internal combustion engine to the intake passage, and the EGR passage
- An EGR control valve for controlling the flow rate of the exhaust gas flowing through the EGR passage disposed on one end side of the EGR passage, an on-off valve disposed on the other end side of the EGR passage for opening and closing the EGR passage, and the EGR An exhaust gas recirculation device comprising a heat exchanger for cooling the exhaust gas led to the passage, wherein the heat exchanger is arranged on the other end side of the EGR passage with respect to the on-off valve.
- a part of the exhaust gas is cooled through the heat exchanger according to the pressure in the exhaust passage, becomes a high density state, and is mixed with the intake air flowing through the intake passage from the EGR control valve.
- the EGR passage is closed by the EGR control valve, the open / close valve is further closed, and the exhaust gas in accordance with the pressure difference between the pressure on the intake passage side and the pressure on the exhaust passage side becomes the EGR control valve. It is temporarily stored in the EGR passage between the on-off valve. In this case, the exhaust gas temporarily stored in the EGR passage is cooled and densified by the heat exchanger.
- the EGR control valve When there is a start request for the internal combustion engine in this state, the EGR control valve is immediately opened, and the exhaust gas in a high density state is guided to the intake passage and mixed with the intake air flowing therethrough. After the EGR control valve is opened, the on-off valve is switched to the valve open state with the consumption of the temporarily stored exhaust gas, that is, the outflow to the intake passage, and the state before the stop request for the internal combustion engine is made.
- the exhaust gas recirculation apparatus it is effective to make the volume of the EGR passage between the EGR control valve and the on-off valve correspond to the exhaust amount of the internal combustion engine. Further, exhaust pressure increasing means for increasing the pressure of the exhaust gas guided to the EGR passage can be further provided.
- the exhaust gas having a high density after passing through the heat exchanger and being cooled is passed between the EGR control valve and the on / off valve. Can be temporarily held in between.
- the exhaust gas temporarily stored in the EGR passage when the internal combustion engine is restarted can be guided to the combustion chamber, and emission emission can be further suppressed.
- the inside of the heat exchanger can be kept in continuous communication with the exhaust passage even when the on-off valve is closed, the adverse effect due to condensation of water vapor in the exhaust gas is reduced, and there is no conventional on-off valve.
- the progress of corrosion of the heat exchanger can be suppressed to the same extent as the exhaust gas recirculation device.
- the exhaust pressure increasing means for increasing the pressure of the exhaust gas guided to the EGR passage is further provided, the pressure of the exhaust gas temporarily stored in the EGR passage between the EGR control valve and the on-off valve can be easily increased. . As a result, it is possible to perform EGR control more accurately when the internal combustion engine is restarted.
- FIG. 1 is a conceptual diagram of an embodiment in which an exhaust gas recirculation device according to the present invention is applied to a compression ignition internal combustion engine.
- FIG. 2 is a control block diagram in the embodiment shown in FIG. 1. It is a flowchart which shows typically the flow of control of the exhaust gas recirculation apparatus in embodiment shown in FIG.
- Embodiments in which the exhaust gas recirculation apparatus according to the present invention is applied to a compression ignition type internal combustion engine will be described in detail with reference to FIGS.
- the present invention is not limited to such an embodiment, and the configuration thereof can be freely changed according to the characteristics required for the application target of the present invention.
- the present invention is also effective for a spark ignition type internal combustion engine in which gasoline, alcohol, LNG (liquefied natural gas) or the like is used as fuel and is ignited by a spark plug.
- FIG. 1 shows the concept of the engine system in the present embodiment
- FIG. 2 shows control blocks in this engine system. That is, the engine 10 in the present embodiment is a compression ignition type multi-cylinder internal combustion engine that spontaneously ignites by directly injecting light oil as fuel into the combustion chamber 12 in a compressed state from the fuel injection valve 11.
- the present invention can be applied even to a single-cylinder internal combustion engine.
- a valve mechanism (not shown) and the previous fuel injection valve 11 are incorporated in a cylinder head 15 formed with an intake port 13 and an exhaust port 14 respectively facing the combustion chamber 12.
- the valve mechanism in the present embodiment includes an intake valve 16 that opens and closes the intake port 13 and an exhaust valve 17 that opens and closes the exhaust port 14.
- the opening and closing timings of the intake valve 16 and the exhaust valve 17 are set according to the operating state of the engine 10. It can be changed. However, it is also possible to employ a valve operating mechanism in which the opening / closing timings of the intake valve 16 and the exhaust valve 17 are fixed.
- the fuel injection valve 11 is arranged facing the center of the upper end of the combustion chamber 12 so as to be sandwiched between the intake valve 16 and the exhaust valve 17.
- the fuel injection valve 11 in this embodiment is a direct injection single injection type in which light oil, which is fuel, is directly injected into the combustion chamber 12 just before the end of the compression stroke, that is, immediately before the compression top dead center of the piston 18.
- a multi-injection type that injects in the middle of the intake stroke in order to form a more uniform mixture, or a port injection type that injects into the intake port 13 It is also possible to adopt.
- the amount and injection timing of fuel from the fuel injection valve 11 is supplied to the combustion chamber 12, the ECU (E lectronic C ontrol U nit ) 20 based on operating conditions of the vehicle including the depression amount of the accelerator pedal 19 by the driver Be controlled.
- the amount of depression of the accelerator pedal 19 is detected by an accelerator opening sensor 21, and the detection information is output to the ECU 20.
- a throttle valve 23 for adjusting the opening degree of the intake passage 22a is incorporated in the middle of the intake pipe 22 connected to the cylinder head 15 so as to communicate with the intake port 13 and defining the intake passage 22a together with the intake port 13. It is.
- the opening degree of the throttle valve 23 is controlled by the ECU 20 via the throttle actuator 24 based on the driving state of the vehicle including the depression amount of the accelerator pedal 19 and the like.
- a water temperature sensor 26 and a crank angle sensor 27 are attached to the cylinder block 25 in which the piston 18 reciprocates.
- the water temperature sensor 26 detects the temperature of the cooling water flowing in the water jacket 28 formed in the cylinder block 25 so as to surround the combustion chamber 12 and outputs the detected temperature to the ECU 20.
- the crank angle sensor 27 detects the rotational phase of the crankshaft 30 to which the piston 18 is connected via the connecting rod 29, that is, the crank angle, and outputs this to the ECU 20.
- the ECU 20 grasps whether or not the warm-up operation is necessary based on the information from the water temperature sensor 26, and on the basis of the information from the crank angle sensor 27, determines the rotation phase of the crankshaft 30 and the engine speed in real time. To grasp.
- the engine 10 incorporates an EGR device 32 that guides part of the exhaust gas flowing through the exhaust passage 31a to the intake passage 22a, an exhaust turbine supercharger 33, and an exhaust purification device 34.
- An EGR device 32 intended to reduce nitrogen oxides in the exhaust gas and improve fuel efficiency, an EGR pipe 35 that defines an EGR passage 35a, and an EGR control valve 36 and an on-off valve 37 that are provided separately from the EGR pipe 35. And a heat exchanger 38.
- the EGR pipe 35 has one end communicating with the exhaust pipe 31 that defines the exhaust passage 31 a together with the exhaust port 14, and the other end with the above-described throttle valve 23 and the surge tank 39 disposed downstream of the throttle valve 23.
- An EGR control valve 36 which is disposed on one end side of the EGR pipe 35 in the vicinity of the connection portion between the intake pipe 22 and the EGR pipe 35 and whose operation is controlled by the ECU 20, is based on the driving state of the vehicle, from the EGR passage 35a.
- the flow rate of the exhaust gas recirculated to the intake passage 22a is controlled.
- the on-off valve 37 disposed on the connection portion side between the exhaust pipe 31 and the EGR pipe 35 is for simply opening and closing the EGR passage 35a, and its opening / closing operation is controlled by the ECU 20.
- the distance between the EGR control valve 36 and the on-off valve 37 is set so that the volume of the EGR passage 35 a partitioned by the closed EGR control valve 36 and the on-off valve 37 is substantially the same as the exhaust amount V of the engine 10. And the inner diameter of the EGR passage 35a between them is set appropriately.
- the heat exchanger 38 for reducing the temperature of the exhaust gas flowing into the EGR passage 35a is an EGR located between the other end side of the EGR pipe 35, that is, between the connection part of the exhaust pipe 31 and the EGR pipe 35 and the on-off valve 37. It is arranged in the middle of the pipe 35. Cooling water flowing through the water jacket 28 formed in the cylinder block 25 is guided to the heat exchanger 38, and high-temperature exhaust gas is efficiently cooled, thereby increasing the charging efficiency of the EGR gas guided to the EGR passage 35a. .
- An exhaust turbine supercharger (hereinafter simply referred to as a supercharger) 33 supercharges the combustion chamber 12 using the kinetic energy of the exhaust gas flowing through the exhaust passage 31a to increase the charging efficiency of the intake air. belongs to.
- the supercharger 33 includes a compressor 33a and a turbine 33b that rotates integrally with the compressor 33a.
- the compressor 33 a is incorporated in the intake pipe 22 located upstream of the throttle valve 23.
- the turbine 33 b is incorporated in the middle of the exhaust pipe 31 connected to the cylinder head 15 so as to communicate with the exhaust port 14.
- the turbine 33b in the present embodiment includes a variable vane (not shown) whose opening degree is controlled by the ECU 20 via the vane actuator 40 (see FIG. 2) based on the driving state of the vehicle.
- variable vane and the vane actuator 40 of the turbine 33b of the supercharger 33 are used as the exhaust pressure increasing means in the present invention.
- an intercooler is provided in the middle of the intake passage 22a between the compressor 33a and the surge tank 39. 41 is incorporated.
- An air flow meter 42 that detects the flow rate of the intake air flowing through the intake passage 22a and outputs it to the ECU 20 is provided in the intake pipe 22 upstream of the compressor 33a of the supercharger.
- the exhaust gas purification device 34 for detoxifying harmful substances generated by the combustion of the air-fuel mixture in the combustion chamber 12 includes an exhaust pipe 31 that defines an exhaust passage 31a downstream of the turbine 33b of the supercharger 33. It is arranged on the way.
- Exhaust gas purifying device 34 in the present embodiment has at least oxidative catalytic converter 34a, DPF (D iesel P articulate F ilter) and, it is also possible to add other catalytic converter, such as NO X catalyst.
- the intake air supplied into the combustion chamber 12 together with the exhaust gas recirculated into the intake passage 22a through the EGR passage 35a forms a mixture with the fuel injected from the fuel injection valve 11 into the combustion chamber 12.
- the piston 18 spontaneously ignites and burns immediately before the compression top dead center of the piston 18, and the exhaust gas generated thereby is exhausted from the exhaust pipe 31 to the atmosphere through the exhaust purification device 34.
- the combustion temperature of the air-fuel mixture decreases due to CO 2 contained in the intake air, the amount of nitrogen oxides generated with the combustion of the air-fuel mixture is suppressed.
- EGR control valve 36 is opened and the EGR gas stored in the EGR passage 35 a is removed. It adds to the intake air flowing through the intake passage 22a. Thereby, EGR control is performed from the time of the first explosion at engine restart.
- the “engine stop request” in the present invention refers to a case where the amount of depression of the accelerator pedal 19 is 0 and the vehicle speed is 0 during the operation of the engine 10 as in the idling operation state of the vehicle.
- the “engine start request” in the present invention refers to a case where the driver depresses the accelerator pedal 19 for starting the vehicle from a state where the engine 10 is stopped by the “engine stop request”.
- the ECU 20 grasps
- the driving state determination unit 43 grasps the driving state of the vehicle and the engine 10 based on detection information from the accelerator opening sensor 21, the water temperature sensor 26, the crank angle sensor 27, the air flow meter 42, and the like. That is, the operation state determination unit 43 also determines whether or not there is an engine stop request or an engine start request.
- the starter motor drive unit 44 controls the operation of an engine starter motor 55 (see FIG. 2) connected to the crankshaft 30 via a joint (not shown) based on an ON signal of an ignition key switch (not shown) or a previous engine start request. .
- the engine starting motor 55 performs motoring of the engine 10.
- the throttle opening setting unit 45 sets an optimal throttle opening that is set in advance based on the depression amount of the accelerator pedal 19 detected by the accelerator opening sensor 21 and the driving state of the vehicle.
- the throttle valve drive unit 46 controls the throttle valve 23 to the opening set by the throttle opening setting unit 45 via the throttle actuator 24.
- the fuel injection setting unit 47 sets the driving torque of the engine 10, that is, the fuel injection amount from the fuel injection valve 11 and the injection timing thereof, based on the detection signal from the accelerator opening sensor 21.
- the fuel injection valve driving unit 48 drives the fuel injection valve 11 so that fuel corresponding to the fuel injection amount set by the fuel injection setting unit 47 is injected at the set injection timing.
- the EGR amount setting unit 51 determines whether the combustion chamber 12 is in accordance with the driving state of the vehicle at this time.
- the amount of EGR to be refluxed that is, the opening degree of the EGR control valve 36 is set.
- the EGR valve drive unit 52 controls the EGR control valve 36 at the opening set by the EGR amount setting unit 51, and otherwise holds the EGR passage 35a in a closed state basically. Even when an engine stop request is made, the EGR control valve 36 is kept closed.
- the vane opening degree setting unit 49 sets the vane opening degree of the turbine 33b of the supercharger 33 based on the engine rotation speed and the driving state of the vehicle.
- the vane drive unit 50 drives the variable vane via the vane actuator 40 so that the vane opening set by the vane opening setting unit 49 is obtained.
- the opening of the variable vane is reduced to the minimum, and the exhaust pressure in the exhaust passage 31a on the upstream side of the turbine 33b of the supercharger 33 is increased. It can lead to the EGR passage 35a.
- the variable vane is returned to the maximum opening so that a quick response can be made when the engine start request is made.
- the EGR accumulation amount calculation unit 53 calculates the amount G E of EGR gas stored in the EGR passage 35 a and outputs this to the operating state determination unit 43. More specifically, the exhaust flow rate G e the EGR control valve 36 is discharged from the engine 10 after the vane actuator 40 closes the variable vanes of the turbine 33b together to close the EGR passage 35a is calculated.
- the on-off valve drive unit 54 controls the opening / closing of the on-off valve 37 according to a preset program based on the previous engine stop request or engine start request. More specifically, if the exhaust gas flow rate G e calculated by the EGR accumulation amount calculation unit 53 based on the engine stop request is made more than the exhaust amount V of the engine 10, it closes the on-off valve 37. When the combustion of fuel in all cylinders is completed based on the engine start request, the on-off valve 37 is switched to the fully open state.
- cooling water temperature T W of the engine 10 detected by the water temperature sensor 26 is equal to or the threshold value T R or first at step S10
- cooling water temperature T W of the engine 10 is equal to or more than a threshold T R Until this step of S10 is repeated.
- the threshold value T R is the minimum value of the cooling water temperature can be performed EGR control smoothly, in general Is set to around 80 ° C.
- step S10 is the step in a cooling water temperature T W is the threshold T R above, that is, when it is determined that it is possible to perform the EGR control smoothly is whether the engine stop request proceeds to step S11 judge. If it is determined that there is no engine stop request, the process returns to step S10 and the above determination is repeated.
- step S11 If it is determined in step S11 that there is an engine stop request, the process proceeds to step S12 to close the EGR control valve 36 and reduce the opening of the variable vane to the minimum.
- step S12 the exhaust pressure in the exhaust passage 31a on the upstream side of the turbine 33b temporarily rises, and the exhaust gas having a higher pressure flows into the EGR passage 35a.
- Predetermined amount of exhaust flow rate G e is led to the exhaust passage 31a after executing the steps in S12 Under these circumstances, in the present embodiment determines whether exceeds engine capacity V. Then, steps of the S13 is repeated amount G e of the exhaust gas led to the exhaust passage 31a is to over engine displacement V.
- step S14 The amount G e of the exhaust gas led to the exhaust passage 31a in S13 of step exceeds the engine capacity V, and if i.e. an amount sufficient high-pressure EGR gas is judged to have flowed into the EGR passage 35a, the step in S14 Migrate to In step S14, the on-off valve 37 is closed, the fuel injection from the fuel injection valve 11 is stopped, the engine 10 is temporarily stopped, and the variable vane is returned from the fully closed state to the fully open state.
- the EGR gas stored in the EGR passage 35 a between the EGR control valve 36 and the on-off valve 37 is isolated from the heat exchanger 38.
- step S15 determines whether or not there is an engine start request, and the step of S15 is repeated until there is an engine start request. If it is determined in step S15 that there is an engine start request, the process proceeds to step S16, and engine start processing, that is, the engine start motor 55 is driven to perform motoring.
- step S17 the EGR control valve 36 is opened to perform EGR control, and fuel is injected from the fuel injection valve 11 to shift the motoring engine 10 to an operating state.
- step S18 it is determined whether or not combustion is performed in all cylinders, and steps S17 and S18 are repeated until combustion is performed in all cylinders.
- step S18 when it is determined in step S18 that all cylinders have been burned, the on-off valve 37 is shifted to the open state in step S19, and exhaust gas is again introduced from the exhaust passage 31a into the EGR passage 35a. . That is, normal EGR control according to the driving state of the vehicle is performed by the EGR control valve 36. Further, the opening degree of the variable vane of the turbine 33b is shifted from the fully closed state to the normal control according to the driving state of the vehicle.
- the EGR control valve 36 is operated and the high-pressure EGR gas stored in the EGR passage 35a flows through the intake passage 22a. Can be included. As a result, EGR control can be reliably performed from the first explosion cylinder, and the amount of nitrogen oxides can be further reduced.
Abstract
Description
11 燃料噴射弁
12 燃焼室
13 吸気ポート
14 排気ポート
15 シリンダーヘッド
16 吸気弁
17 排気弁
18 ピストン
19 アクセルペダル
20 ECU
21 アクセル開度センサー
22 吸気管
22a 吸気通路
23 スロットル弁
24 スロットルアクチュエーター
25 シリンダーブロック
26 水温センサー
27 クランク角センサー
28 水ジャケット
29 連接棒
30 クランク軸
31 排気管
31a 排気通路
32 EGR装置
33 排気タービン式過給機
33a コンプレッサー
33b タービン
34 排気浄化装置
34a 酸化触媒コンバーター
35 EGR管
35a EGR通路
36 EGR制御弁
37 開閉弁
38 熱交換器
39 サージタンク
40 ベーンアクチュエーター
41 インタークーラー
42 エアーフローメーター
43 運転状態判定部
44 始動モーター駆動部
45 スロットル開度設定部
46 スロットル弁駆動部
47 燃料噴射設定部
48 燃料噴射弁駆動部
49 ベーン開度設定部
50 ベーン駆動部
51 EGR量設定部
52 EGR弁駆動部
53 EGR蓄積量算出部
54 開閉弁駆動部
55 エンジン始動モーター
V エンジンの排気量
Ge 排気流量
Claims (3)
- 一端が吸気通路に連通すると共に他端が排気通路に連通し、内燃機関から排出される排気の一部を吸気通路に導くためのEGR通路と、このEGR通路の一端側に配されて当該EGR通路を流れる排気の流量を制御するためのEGR制御弁と、前記EGR通路の他端側に配されて前記EGR通路を開閉するための開閉弁と、前記EGR通路に導かれる排気を冷却するための熱交換器とを具えた排気還流装置であって、
前記熱交換器が前記開閉弁よりも前記EGR通路の他端側に配されていることを特徴とする排気還流装置。 - 前記EGR制御弁と前記開閉弁との間の前記EGR通路の容積が内燃機関の排気量に対応していることを特徴とする請求項1に記載の排気還流装置。
- 前記EGR通路に導かれる排気の圧力を上昇させるための排気昇圧手段をさらに具えたことを特徴とする請求項1または請求項2に記載の排気還流装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2011/000759 WO2012107960A1 (ja) | 2011-02-10 | 2011-02-10 | 排気還流装置 |
US13/983,889 US8955499B2 (en) | 2011-02-10 | 2011-02-10 | Exhaust gas recirculation device |
EP11858015.8A EP2674603A4 (en) | 2011-02-10 | 2011-02-10 | EXHAUST GAS RECIRCULATION DEVICE |
JP2012556658A JP5516759B2 (ja) | 2011-02-10 | 2011-02-10 | 排気還流装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2011/000759 WO2012107960A1 (ja) | 2011-02-10 | 2011-02-10 | 排気還流装置 |
Publications (1)
Publication Number | Publication Date |
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WO2012107960A1 true WO2012107960A1 (ja) | 2012-08-16 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2011/000759 WO2012107960A1 (ja) | 2011-02-10 | 2011-02-10 | 排気還流装置 |
Country Status (4)
Country | Link |
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US (1) | US8955499B2 (ja) |
EP (1) | EP2674603A4 (ja) |
JP (1) | JP5516759B2 (ja) |
WO (1) | WO2012107960A1 (ja) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012087636A (ja) * | 2010-10-15 | 2012-05-10 | Nissan Motor Co Ltd | 内燃機関の排気還流制御装置 |
US9541039B2 (en) * | 2013-03-14 | 2017-01-10 | Cummins Ip, Inc. | Apparatus, system, and method for reducing emission of nitrogen oxides |
US9790876B2 (en) * | 2013-03-14 | 2017-10-17 | Cummins Ip, Inc. | Advanced exhaust gas recirculation fueling control |
FR3022946B1 (fr) * | 2014-06-26 | 2019-06-28 | Valeo Systemes De Controle Moteur | Systeme moteur avec circuit de recirculation des gaz brules |
JP6825541B2 (ja) * | 2017-11-15 | 2021-02-03 | トヨタ自動車株式会社 | Egr制御装置 |
Citations (5)
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JP2005188314A (ja) * | 2003-12-24 | 2005-07-14 | Nissan Motor Co Ltd | エンジンの排気還流装置 |
JP2005325811A (ja) * | 2004-05-17 | 2005-11-24 | Toyota Motor Corp | 圧縮着火内燃機関の燃焼制御方法 |
JP2007262902A (ja) | 2006-03-27 | 2007-10-11 | Isuzu Motors Ltd | エンジンの燃焼制御方法及び燃焼制御装置 |
JP2008298023A (ja) * | 2007-06-01 | 2008-12-11 | Toyota Motor Corp | 内燃機関のegrシステム |
JP2010255599A (ja) * | 2009-04-28 | 2010-11-11 | Toyota Motor Corp | 内燃機関のegr装置 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
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EP0980966B1 (de) * | 1998-08-19 | 2002-05-08 | Bayerische Motoren Werke Aktiengesellschaft | Abgasanlage einer Brennkraftmaschine mit einem Speichervolumen |
FR2873405B1 (fr) * | 2004-07-21 | 2009-08-07 | Renault V I Sa | Dispositif et procede de suralimentation en gaz comprime d'une tubulure d'admission d'un moteur turbo-compresse |
US7945376B2 (en) * | 2005-07-11 | 2011-05-17 | Mack Trucks, Inc. | Engine and method of maintaining engine exhaust temperature |
US7900609B2 (en) * | 2007-04-18 | 2011-03-08 | Continental Automotive Canada, Inc. | Dual exhaust gas recirculation valve |
JP2009191772A (ja) * | 2008-02-15 | 2009-08-27 | Toyota Motor Corp | 内燃機関のegr装置 |
JP4730447B2 (ja) * | 2009-02-18 | 2011-07-20 | 株式会社デンソー | 低圧egr装置 |
DE102009036743A1 (de) * | 2009-08-08 | 2011-02-10 | Daimler Ag | Verbrennungskraftmaschine |
JP5433534B2 (ja) * | 2009-09-08 | 2014-03-05 | 株式会社豊田自動織機 | 過給機付き内燃機関 |
US20110289914A1 (en) * | 2010-05-28 | 2011-12-01 | Caterpillar Inc. | Upstream egr restriction |
-
2011
- 2011-02-10 EP EP11858015.8A patent/EP2674603A4/en not_active Withdrawn
- 2011-02-10 WO PCT/JP2011/000759 patent/WO2012107960A1/ja active Application Filing
- 2011-02-10 JP JP2012556658A patent/JP5516759B2/ja not_active Expired - Fee Related
- 2011-02-10 US US13/983,889 patent/US8955499B2/en not_active Expired - Fee Related
Patent Citations (5)
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JP2005188314A (ja) * | 2003-12-24 | 2005-07-14 | Nissan Motor Co Ltd | エンジンの排気還流装置 |
JP2005325811A (ja) * | 2004-05-17 | 2005-11-24 | Toyota Motor Corp | 圧縮着火内燃機関の燃焼制御方法 |
JP2007262902A (ja) | 2006-03-27 | 2007-10-11 | Isuzu Motors Ltd | エンジンの燃焼制御方法及び燃焼制御装置 |
JP2008298023A (ja) * | 2007-06-01 | 2008-12-11 | Toyota Motor Corp | 内燃機関のegrシステム |
JP2010255599A (ja) * | 2009-04-28 | 2010-11-11 | Toyota Motor Corp | 内燃機関のegr装置 |
Also Published As
Publication number | Publication date |
---|---|
JP5516759B2 (ja) | 2014-06-11 |
EP2674603A1 (en) | 2013-12-18 |
US8955499B2 (en) | 2015-02-17 |
JPWO2012107960A1 (ja) | 2014-07-03 |
EP2674603A4 (en) | 2014-10-01 |
US20130312715A1 (en) | 2013-11-28 |
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