CN115492704A - EGR system - Google Patents
EGR system Download PDFInfo
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- CN115492704A CN115492704A CN202211341129.XA CN202211341129A CN115492704A CN 115492704 A CN115492704 A CN 115492704A CN 202211341129 A CN202211341129 A CN 202211341129A CN 115492704 A CN115492704 A CN 115492704A
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- valve
- egr cooler
- connecting piece
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- 238000009434 installation Methods 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000009423 ventilation Methods 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 48
- 238000007789 sealing Methods 0.000 description 9
- 239000002912 waste gas Substances 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000001914 calming effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
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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
- F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities
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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
- F02M26/09—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to 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
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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
- F02M26/22—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
- F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
- F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on 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
- F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
- F02M26/32—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
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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
- F02M26/45—Sensors specially adapted for EGR systems
- F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
- F02M26/47—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition the characteristics being temperatures, pressures or flow rates
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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
- F02M26/51—EGR valves combined with other devices, e.g. with intake valves or compressors
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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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Analytical Chemistry (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
The invention discloses an EGR (exhaust gas recirculation) system, which comprises a connecting piece, wherein a through hole I which is transversely communicated with the connecting piece is formed in the connecting piece, a first connecting end is formed at the front end of the through hole I, a second connecting end is formed at the rear end of the through hole I, the circumferential outer wall of the connecting piece extends outwards to form a valve seat, a through hole II communicated with the through hole I is formed in the valve seat, and a through hole III communicated with the through hole I is also formed in the connecting piece; the EGR cooler is assembled on the valve seat through the EGR valve, and the EGR valve is used for adjusting the circulating exhaust gas discharged to the through hole I through the EGR cooler; the air conditioner further comprises a mixing valve and a supercharger, wherein the supercharger is assembled at the first connecting end through the mixing valve, and the mixing valve is used for adjusting fresh air exhausted to the through hole I through the supercharger; the EGR cooler has the inlet end and gives vent to anger the end, the end of giving vent to anger is located the top of inlet end and can solves the problem that present EGR valve freezes under the low temperature, reduces the fault rate of engine.
Description
Technical Field
The invention relates to the field of engines, in particular to an EGR (exhaust gas recirculation) system.
Background
EGR (Exhaust Gas Recirculation) is a technique in which a part of Exhaust Gas is introduced into an intake side after combustion in an automobile engine and is again taken into an intake for combustion; with the increasing prominence of global environmental pollution and energy shortage pressure problems and the increasing tightening of vehicle oil consumption limit and emission regulations, the EGR technology is increasingly used on engines, and the EGR mainly aims at reducing nitrogen oxides in exhaust gas and improving fuel economy under partial load.
The low-pressure EGR technology is that part of waste gas is led into the upstream of a supercharger through an EGR inlet pipe, an EGR cooler, an EGR valve and an EGR outlet pipe, is mixed with fresh air, is compressed by the supercharger and then enters a cylinder for combustion; during the operation of the engine, the temperature of the exhaust gas of the engine is high, the water content in the exhaust gas is high, condensed water generated after the engine is stopped can be attached to an EGR valve far away from an EGR air inlet pipe, particularly a valve plate and a valve shaft of the EGR valve, the condensed water freezes when the ambient temperature is lower than 0 ℃, and when the engine is restarted, the EGR valve can be blocked and cannot be opened due to freezing.
Therefore, in order to solve the above problems, an EGR system is needed, which can solve the problem of freezing of the EGR valve at low temperature and reduce the failure rate of the engine.
Disclosure of Invention
In view of this, the present invention provides an EGR system to overcome the defects in the prior art, and can solve the problem of icing of the existing EGR valve at low temperature, and reduce the failure rate of the engine.
The EGR system comprises a connecting piece, wherein a through hole I which is penetrated through in the transverse direction is formed in the connecting piece, a first connecting end is formed at the front end of the through hole I, a second connecting end is formed at the rear end of the through hole I, the circumferential outer wall of the connecting piece extends outwards to form a valve seat, a through hole II which is communicated with the through hole I is formed in the valve seat, and a through hole III which is communicated with the through hole I is also formed in the connecting piece; the EGR cooler is assembled on the valve seat through the EGR valve, and the EGR valve is used for adjusting the circulating exhaust gas discharged to the through hole I through the EGR cooler; the air conditioner further comprises a mixing valve and a supercharger, wherein the supercharger is assembled at the first connecting end through the mixing valve, and the mixing valve is used for adjusting fresh air exhausted to the through hole I through the supercharger; the crankcase ventilation device is characterized by further comprising a one-way valve and a curved through pipe, wherein the curved through pipe is communicated with the through hole III through the one-way valve, and the one-way valve is used for adjusting the air outlet of the crankcase which is discharged to the through hole I through the curved through pipe; the EGR cooler has an air inlet end and an air outlet end, and the air outlet end is located at the top of the air inlet end.
The EGR cooler is characterized by further comprising a differential pressure sensor, wherein the differential pressure sensor is communicated to an air outlet end of the EGR cooler through a differential pressure sensor high-pressure pipe, and is communicated to the through hole I through a differential pressure sensor low-pressure pipe.
Further, the EGR cooler is mounted at a predetermined position by a bracket.
Furthermore, a water-gas separator is arranged on the second connecting end and forms a plug for the second connecting end, so that gas in the through hole I is discharged to a set environment through the water-gas separator.
Furthermore, water in the through hole I is discharged to the air inlet end of the EGR cooler through the water-gas separator.
Further, the EGR cooler further comprises an EGR temperature sensor, and the EGR temperature sensor is arranged at the air outlet end of the EGR cooler.
Further, the installation surface of the first connection end is perpendicular to the installation surface of the valve seat.
Further, the through hole II is formed in a direction parallel to the height direction, so that the central axis of the through hole I is perpendicular to the central axis of the through hole II, and the through hole III is formed in a direction parallel to the longitudinal direction, so that the central axis of the through hole III, the central axis of the through hole II and the central axis of the through hole I are in a pairwise corresponding mutually perpendicular relationship.
Further, the transverse front end of the through hole I extends from front to back to form a taper with a large front end diameter and a small rear end diameter, and the farthest end of the tapered small-diameter end extending from the transverse back does not exceed the central axis of the through hole II.
Furthermore, the second link is the tube-shape by the horizontal rear side of connecting piece and extends backward and forms, the inner wall of tube-shape forms the horizontal back end of through-hole I, the second link outwards extends along the circumference outer wall that transversely leans on the back and forms annular sealed protruding.
The beneficial effects of the invention are: the invention discloses an EGR system, which monitors a pressure difference value of mixed gas in a connecting piece before an EGR valve and after the exhaust gas passes through an EGR cooler through a pressure difference sensor, is different from the traditional method that only the pressure difference of the exhaust gas before and after the EGR valve is detected, transmits a pressure difference signal to an engine controller ECU, and adjusts an opening degree of the EGR valve through the engine controller ECU so as to meet the requirement of an engine on the EGR rate, and adjusts the opening degree of the mixing valve at the same time to control the flow of fresh air entering the connecting piece, wherein a curved pipe is provided with a conductive control, can detect a leakage amount at a front interface and a rear interface of the curved pipe, and can monitor the pressure of a crankcase; EGR temperature sensor detects the temperature of waste gas after EGR cooler cooling, gives engine controller ECU with temperature signal transmission, and rethread engine controller ECU adjusts intelligent thermal management system, adjusts the cooling water flow that gets into the EGR cooler, guarantees that the EGR cooler is worked at the most suitable operating mode all the time, can the effective control waste gas temperature after the EGR cooler, avoids the end of calming the anger that high-temperature gas got into the booster.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a schematic (front) view of the structure of the present invention;
FIG. 2 is a schematic structural diagram of the present invention (reversed);
FIG. 3 is a schematic (front) view of the construction of the connector of the present invention;
FIG. 4 is a schematic structural view of the connector of the present invention (reverse);
FIG. 5 is a front view of the connector of the present invention (the first connecting end side);
FIG. 6 isbase:Sub>A schematic view of the structure along line A-A of FIG. 5 according to the present invention.
Detailed Description
Fig. 1 is a schematic structural diagram of the present invention, and as shown in the drawing, an EGR system in this embodiment includes a connecting piece 11, where a through hole i 18 is formed in the connecting piece 11, the transverse direction is a direction of a central axis of the through hole i 18, where the former direction is a side close to a mixing valve in the transverse direction, otherwise, a first connection end 19 is formed at a front end of the through hole i 18, a second connection end 20 is formed at a rear end of the through hole i 18, a circumferential outer wall of the connecting piece 11 extends outward to form a valve seat, a through hole ii 21 communicated with the through hole i 18 is formed in the valve seat, the height direction is a direction of a central axis of the through hole ii 21, and a through hole iii 22 communicated with the through hole i 18 is further formed in the connecting piece 11; the longitudinal direction is the direction of the central axis of the through hole III 22, the inner direction is the direction close to the central axis of the through hole I18, otherwise, the description is omitted;
further comprising an EGR valve 10 and an EGR cooler 8, the EGR cooler 8 being fitted to a valve seat through the EGR valve 10, the EGR valve 10 being for regulating the circulating exhaust gas discharged through the EGR cooler 8 to the through-hole I18;
the air conditioner further comprises a mixing valve 14 and a pressure booster, wherein the pressure booster is assembled at the first connecting end 19 through the mixing valve 14, and the mixing valve 14 is used for regulating fresh air exhausted to a through hole I18 through the pressure booster;
the crankcase ventilation device further comprises a one-way valve 4 and a curved through pipe, the curved through pipe is communicated with the through hole III 22 through the one-way valve 4, and the one-way valve 4 is used for adjusting the crankcase ventilation which is discharged to the through hole I18 through the curved through pipe;
the EGR cooler 8 is provided with an air inlet end and an air outlet end, the air outlet end is positioned at the top of the air inlet end, so that backflow liquid can be at least collected in an air outlet manifold positioned at the bottom of the EGR cooler or directly collected in an exhaust system to be discharged, the problem that the existing EGR valve is frozen at low temperature can be solved, and the failure rate of an engine is reduced.
In this embodiment, the use of the connecting piece 11 can improve the intercommunity of the air flow and ensure the stability of the air flow pressure; the arrangement of the connecting pieces 11 can improve the assembly efficiency of each accessory, when the interface of the accessory is changed, the assembly of each accessory in the EGR system can be met only by correspondingly adjusting the additionally arranged connecting pieces, the adjustment is generally only the adjustment of the interface size and the positioning position, the assembly requirement of the connecting pieces on each component can be met without secondary die sinking, the modification of a formed die is avoided, and the development cost is reduced;
in this embodiment, the mounting surface of the first connection end 19 is perpendicular to the mounting surface of the valve seat. The structure compactness and the structure stability are improved. The utility model discloses a structure installation structure, including through-hole I, sealing groove, sealing element/sealing material, sealing element in this scheme are O type sealing rubber ring, improve the sealing degree of connecting piece at the junction, the opening has been seted up to the circumference lateral wall of sealing groove, and the effect of this opening lies in providing locate function for the annex of treating the installation for each mounting means homoenergetic is sealed fixed with the connecting piece according to established mounting means and mounted position, provides the installation benchmark, guarantees the reliability and the sealed degree of structural installation. The booster is pressed the end air inlet and is adopted the rubber tube cover to establish and cooperate the mode of clamp locking and the sealed installation of the second link of connecting piece 11, and sealed bellied arranging can further improve the leakproofness that corresponds the kneck, and cooperation clamp locking more can make the gas tightness of here interface obtain promoting, not shown in this picture of clamp, choose for use among the prior art any kind of cyclic annular clamp to accomplish the rubber tube can at the sealed of second link 1, no longer give unnecessary details here.
In this embodiment, the through hole ii 21 is formed parallel to the height direction so that the central axis of the through hole i 18 is perpendicular to the central axis of the through hole ii 21, the through hole iii 22 is formed parallel to the longitudinal direction so that the central axis of the through hole iii 22, the central axis of the through hole ii 21 and the central axis of the through hole i 18 are in a pairwise corresponding mutually perpendicular relationship, where the pairwise corresponding mutually perpendicular meaning is that the central axis of the through hole i 3 is perpendicular to the central axis of the through hole ii 4, the central axis of the through hole i 3 is perpendicular to the central axis of the through hole iii 5, and the central axis of the through hole ii 4 is perpendicular to the central axis of the through hole iii 5, which is not described herein again; the intercommunity of the airflow is improved, and the stability of the pressure of the airflow is ensured; the through hole II is an equal-diameter columnar through hole which is formed in parallel to the height direction, is close to the second connecting end in the transverse direction, improves a gas storage space which is formed by gas entering from the first connecting end, and plays a role in increasing the gas pressure.
In the embodiment, the transverse front end of the through hole I18 extends forwards and backwards to form a cone with a large front end and a small rear end, and the farthest end of the conical small-diameter end extending transversely and backwards does not exceed the central axis of the through hole II 21; the farthest end of the conical small-diameter end extending transversely backwards does not exceed the central axis of the through hole II, so that the structural strength is improved, the application advantage of the conical structure in the scheme can be highlighted, and the flow stability of the air inlet end during high-pressure air inlet is optimized.
In this embodiment, the second connection end 20 is formed by extending the lateral rear side of the connection member 11 backward in a cylindrical shape, the inner wall of the cylindrical shape forms the lateral rear section of the through hole i 18, and the second connection end 20 extends outward along the lateral rear circumferential outer wall to form an annular sealing protrusion.
In this embodiment, be formed with last installation department and lower installation department on the connecting piece, go up installation department and lower installation department not be located the homonymy of I the central axis of through-hole simultaneously in the direction of height. As shown in the figure, the last installation department of this scheme corresponds respectively with lower installation department in the direction of height and sets up in the upside and the downside of I the central axis of through-hole to go up the installation department and form in the top surface of connecting piece body direction of height, lower installation department is formed in the bottom surface of connecting piece body direction of height, the effect of going up installation department and lower installation department lies in providing the installation position for the installation of annex, guarantees compact structure nature, as shown in the figure, on horizontal projection go up the installation department and all constitute the structure of sharp horn shape with lower installation department, improve the reliability of annex installation on corresponding installation department and lower installation department to and the installation intensity of annex on the connecting piece body.
In the embodiment, the EGR cooler further comprises a differential pressure sensor 1, the differential pressure sensor 1 is communicated to the air outlet end of the EGR cooler 8 through a differential pressure sensor high-pressure pipe 13, and the differential pressure sensor 1 is communicated to a through hole I18 through a differential pressure sensor low-pressure pipe 12. The EGR assembly is higher in integration level, the use of parts is reduced, the failure rate of the EGR assembly is reduced, the EGR assembly is different from the large-span use of a differential pressure sensor in the prior art, a monitoring path is shortened, the structure compactness is improved, and the detection precision is improved.
In the present embodiment, the EGR cooler 8 is mounted at a predetermined position by a bracket. As shown in the figure, the EGR cooler is arranged at a preset position in a vertical arrangement mode through a bracket, the attachment of return water on the EGR valve is reduced, the icing phenomenon of the EGR valve can not occur, the failure rate is greatly reduced, and the performance of the engine is better.
In this embodiment, the second connection end 20 is provided with a water-gas separator 17, and the water-gas separator 17 seals the second connection end 20, so that the gas in the through hole i 18 is discharged to a set environment through the water-gas separator 17. The set environment is a pressure air end of the supercharger; the use of the water-gas separator can further reduce the gaseous water in the gas, improve the purity of the gas in application, and eliminate the intercepted water, thereby ensuring the high-efficiency combustion of the engine.
In this embodiment, the water in the through-hole i 18 is discharged to the intake end of the EGR cooler 8 through the moisture separator 17. The use of accessory parts is reduced, and the failure rate is reduced.
In the embodiment, the system further comprises an EGR temperature sensor 9, and the EGR temperature sensor 9 is arranged at the air outlet end of the EGR cooler 8. EGR temperature sensor 9 detects the temperature of waste gas after EGR cooler 8 cools off, gives engine controller ECU with temperature signal transmission, and rethread engine controller ECU adjusts intelligent thermal management system, adjusts the cooling water flow that gets into EGR cooler 8, guarantees that EGR cooler 8 works at the most suitable operating mode all the time, can the effective control through the waste gas temperature behind EGR cooler 8, avoids high-temperature gas to get into the end of calming the anger of booster.
The EGR system disclosed by the scheme comprises a differential pressure sensor 1, a differential pressure sensor high-pressure pipe 13, a differential pressure sensor low-pressure pipe 12, a connecting piece 11, a mixing valve 14 sealing gasket 3, a belt-type conductive curved pipe 2, a one-way valve 4, a water-gas separator 17, an EGR valve 10, an EGR cooler 8, an EGR temperature sensor 9, an EGR gas inlet pipe 7, an EGR cooler bracket 5, a sealing gasket and the like, wherein the EGR valve 10 adopts a butterfly valve, the butterfly valve has larger opening degree, the flow rate of exhaust gas can be effectively improved, the EGR rate is improved, the inlet of the EGR valve 10 is directly connected with the EGR cooler 8, the pipeline connection is reduced, the outlet of the EGR valve 10 is directly connected with the connector 11, the connector of the EGR valve 10 of the mixing valve 14 and the connecting piece 11 is directly connected with the connector 14 of the mixing valve, the belt-type conductive curved pipe 2 and the connector 11, the exhaust gas enters the connecting piece 11 through the EGR valve 10 after being cooled by the EGR cooler 8, fresh air enters the connecting piece 11 after passing through an air filter and the mixing valve 14, crankcase gas enters the connecting piece 11, the crankcase gas after passing through the gas-gas separation and the gas-gas supercharger 17, three paths 2 and three paths enter the three paths of the three paths enter the gas-path of the gas-path, the gas-pressure booster; one end of a pressure difference sensor high-pressure pipe 13 is connected with the EGR cooler 8, the other end of the pressure difference sensor high-pressure pipe is connected with a pressure difference sensor 1 high-pressure air inlet, one end of a pressure difference sensor low-pressure pipe 12 is connected with a connecting piece 11, and the other end of the pressure difference sensor low-pressure pipe is connected with a pressure difference sensor 1 low-pressure air outlet; the EGR temperature sensor 9 is designed at the air outlet part of the EGR cooler 8, so that the temperature of the exhaust gas cooled by the EGR cooler 8 can be effectively monitored; the one-way valve 4 and the water separator 17 are integrally arranged in the connecting piece 11, so that the arrangement space can be effectively reduced.
Control strategy for EGR system: the differential pressure sensor 1 monitors a pressure difference value of mixed gas in a connecting piece 11 in front of an EGR valve 10 and behind a mixing valve 14 after waste gas passes through an EGR cooler 8, is different from the traditional method that only the pressure difference of the waste gas in front of and behind the EGR valve 10 is detected, a differential pressure signal is transmitted to an engine controller ECU, and then an opening degree of the EGR valve 10 is adjusted through the engine controller ECU so as to meet the requirement of an engine on an EGR rate and adjust an opening degree of the mixing valve 14 at the same time, the flow of fresh air entering the connecting piece 11 is controlled, a crank pipe is provided with a conductive control, a leakage amount at the front and rear interfaces of the crank pipe can be detected, and meanwhile, the pressure of a crankcase can also be monitored; the EGR temperature sensor 9 detects the temperature of the exhaust gas cooled by the EGR cooler 8, transmits a temperature signal to the engine controller ECU, adjusts the intelligent thermal management system through the engine controller ECU, adjusts the flow rate of cooling water entering the EGR cooler 8, ensures that the EGR cooler 8 always works in the most proper working condition, can effectively control the temperature of the exhaust gas passing through the EGR cooler 8, and avoids high-temperature gas from entering the air compression end of the supercharger; the scheme belongs to the prior art in terms of the corresponding connection mode, control mode and communication mode of each component and system connected with the ECU, and is not described again; such as a differential pressure sensor 1, a conductive curved pipe 2, a one-way valve 4, an EGR cooler 8, an EGR temperature sensor 9, an EGR valve 10, a mixing valve 14, a water-gas separator and the like are correspondingly connected with the ECU in a communication way.
The invention has the technical protection points and advantages that:
1. the whole EGR system is vertically arranged, the connecting piece 11 is simultaneously and directly connected with the EGR valve 10, the mixing valve 14 and the crank pipe, the use of pipelines is reduced, the response efficiency of the EGR valve 10 is greatly improved, the use cost of the pipelines is reduced, the water-gas separator 17 is integrally arranged in the connecting piece 11, the water entering an engine cylinder can be reduced, and the efficient combustion of the engine is ensured;
2. the whole EGR system is vertically arranged, and the moisture separated by the moisture separator 17 cannot be left in the connecting piece 11, the EGR valve 10 and the EGR cooler 8 and directly flows back to the exhaust system to be discharged, so that the problem of icing of the EGR valve 10 can be effectively prevented;
3. the one-way valve 4 is integrated in the connecting piece 11, so that the oil-gas mixed gas in the curved pipe can only flow into the connecting piece 11 in one way, the mixed gas in the connecting piece 11 cannot flow into the curved pipe, and the pressure of a crankcase is ensured;
the differential pressure sensor 1 detects the differential pressure between the exhaust gas in front of the EGR valve 10 and the mixture gas in the connecting member 11 after the EGR cooler 8, and the differential pressure signal can control the opening degree of the EGR valve 10 and the opening degree of the mixture valve 14 simultaneously through the engine controller ECU.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. An EGR system, characterized in that: the connecting piece is provided with a through hole I which is transversely communicated, the front end of the through hole I forms a first connecting end, the rear end of the through hole I forms a second connecting end, the circumferential outer wall of the connecting piece extends outwards to form a valve seat, the valve seat is provided with a through hole II communicated with the through hole I, and the connecting piece is further provided with a through hole III communicated with the through hole I; the EGR cooler is assembled on the valve seat through the EGR valve, and the EGR valve is used for adjusting the circulating exhaust gas discharged to the through hole I through the EGR cooler; the air conditioner further comprises a mixing valve and a supercharger, wherein the supercharger is assembled at the first connecting end through the mixing valve, and the mixing valve is used for adjusting fresh air exhausted to the through hole I through the supercharger; the crankcase ventilation device is characterized by further comprising a one-way valve and a curved pipe, wherein the curved pipe is communicated with the through hole III through the one-way valve, and the one-way valve is used for adjusting the crankcase ventilation discharged to the through hole I through the curved pipe; the EGR cooler has an inlet end and an outlet end, the outlet end being located at the top of the inlet end.
2. The EGR system of claim 1 wherein: the EGR cooler is characterized by further comprising a differential pressure sensor, wherein the differential pressure sensor is communicated to the air outlet end of the EGR cooler through a differential pressure sensor high-pressure pipe, and is communicated to the through hole I through a differential pressure sensor low-pressure pipe.
3. The EGR system of claim 1 wherein: the EGR cooler is mounted at a predetermined position by a bracket.
4. The EGR system of claim 1 wherein: and the second connecting end is provided with a water-gas separator which forms a plug for the second connecting end, so that the gas in the through hole I is discharged to a set environment through the water-gas separator.
5. The EGR system of claim 4, wherein: and water in the through hole I is discharged to the air inlet end of the EGR cooler through the water-gas separator.
6. The EGR system of claim 1 wherein: the EGR cooler is characterized by further comprising an EGR temperature sensor, wherein the EGR temperature sensor is arranged at the air outlet end of the EGR cooler.
7. The EGR system of claim 1 wherein: the installation surface of the first connection end is perpendicular to the installation surface of the valve seat.
8. The EGR system of claim 1 wherein: the through hole II is parallel to the height direction, so that the central axis of the through hole I is perpendicular to the central axis of the through hole II, the through hole III is parallel to the longitudinal direction, and the central axis of the through hole III, the central axis of the through hole II and the central axis of the through hole I are in pairwise corresponding mutually perpendicular relation.
9. The EGR system of claim 8 wherein: the transverse front end of the through hole I extends forwards and backwards to form a cone shape with a large front end diameter and a small rear end diameter, and the farthest end of the cone-shaped small diameter end extending transversely and backwards does not exceed the central axis of the through hole II.
10. The EGR system of claim 9 wherein: the second link is the tube-shape by the horizontal rear side of connecting piece and extends backward and forms, the inner wall of tube-shape forms the horizontal back end of through-hole I, the second link outwards extends along the circumference outer wall that transversely leans on the back and forms annular sealed protruding.
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