CN115492704B - EGR system - Google Patents
EGR system Download PDFInfo
- Publication number
- CN115492704B CN115492704B CN202211341129.XA CN202211341129A CN115492704B CN 115492704 B CN115492704 B CN 115492704B CN 202211341129 A CN202211341129 A CN 202211341129A CN 115492704 B CN115492704 B CN 115492704B
- Authority
- CN
- China
- Prior art keywords
- hole
- egr
- valve
- connecting piece
- egr cooler
- 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.)
- Active
Links
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 53
- 238000009434 installation Methods 0.000 description 17
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000007710 freezing Methods 0.000 description 4
- 230000008014 freezing Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 239000002912 waste gas Substances 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 206010060904 Freezing phenomenon Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011217 control strategy Methods 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
- 239000007788 liquid Substances 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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
- F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities
-
- 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
-
- 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
-
- 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
- F02M26/29—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
-
- 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
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention discloses an EGR system, which comprises a connecting piece, wherein a through hole I which is transversely communicated 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 exhaust gas recirculation system further comprises an EGR valve and an EGR cooler, wherein 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 mixing valve is used for adjusting fresh air discharged to the through hole I through the supercharger; the EGR cooler 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, the problem that an existing EGR valve freezes at low temperature can be solved, and the failure rate of an engine is reduced.
Description
Technical Field
The invention relates to the field of engines, in particular to an EGR 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 then the exhaust gas is burned by re-intake; with the increasing prominence of global environmental pollution and energy shortage pressure problems, and the increasing tightening of the whole vehicle fuel consumption limit and emission regulations, the EGR technology is increasingly used on engines, and the main purpose of EGR is to reduce nitrogen oxides in exhaust gas and improve fuel economy during partial load.
The low-pressure EGR technology is that part of waste gas is led into the upstream of the supercharger through an EGR air inlet pipe, an EGR cooler, an EGR valve and an EGR air outlet pipe, mixed with fresh air, compressed by the supercharger and then enters a cylinder for combustion; in the running process of the engine, the temperature of the exhaust gas of the engine is higher, the water content in the exhaust gas is more, 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 is frozen 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, there is a need for an EGR system that can solve the problem of freezing at low temperatures of the existing EGR valve and reduce the failure rate of the engine.
Disclosure of Invention
In view of the above, the present invention aims to overcome the defects in the prior art, and provide an EGR system, which can solve the problem of freezing at low temperature of the existing EGR valve, and reduce the failure rate of the engine.
The EGR system comprises a connecting piece, wherein a through hole I which is transversely communicated 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, a valve seat is formed by outwards extending the peripheral outer wall of the connecting piece, 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 exhaust gas recirculation system further comprises an EGR valve and an EGR cooler, wherein 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 mixing valve is used for adjusting fresh air discharged to the through hole I through the supercharger; the crank case is characterized by further comprising a one-way valve and a crank tube, wherein the crank tube is communicated with the through hole III through the one-way valve, and the one-way valve is used for adjusting crankcase gas discharged to the through hole I through the crank tube; the EGR cooler has an air inlet end and an air outlet end, the air outlet end being located at the top of the air inlet end.
Further, the EGR cooler further comprises a differential pressure sensor, wherein the differential pressure sensor is communicated to the air outlet end of the EGR cooler through a high-pressure pipe of the differential pressure sensor, and the differential pressure sensor is communicated to the through hole I through a low-pressure pipe of the differential pressure sensor.
Further, the EGR cooler is mounted at a preset position by a bracket.
Further, a water-gas separator is arranged on the second connecting end, and the water-gas separator 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.
Further, the water in the through hole I is discharged to the intake end of the EGR cooler through the moisture separator.
Further, the system also comprises an EGR temperature sensor, wherein the EGR temperature sensor is arranged at the air outlet end of the EGR cooler.
Further, the mounting surface of the first connecting end is perpendicular to the mounting surface of the valve seat.
Further, the through hole II is arranged in parallel to the height direction, so that the central axis of the through hole I is vertical to the central axis of the through hole II, and the through hole III is arranged in 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 corresponding mutually vertical relation.
Further, the transverse front end of the through hole I extends from front to back to form a cone shape with a large front end and a small rear end, 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.
Further, the second connecting end is formed by extending the transverse rear side of the connecting piece in a barrel-shaped mode backwards, the inner wall of the barrel-shaped mode forms the transverse rear section of the through hole I, and the second connecting end extends outwards along the transverse rear circumferential outer wall to form an annular sealing protrusion.
The beneficial effects of the invention are as follows: the invention discloses an EGR system, which is characterized in that a differential pressure sensor is used for monitoring a pressure difference of mixed gas in a connecting piece between a front part of an EGR valve and a rear part of the mixing valve after waste gas passes through the EGR cooler, the differential pressure sensor is different from the traditional differential pressure sensor used for only detecting the front and rear waste gas of the EGR valve, the differential pressure signal is transmitted to an ECU (electronic control unit) of an engine controller, the ECU of the engine controller is used for adjusting an opening of the EGR valve to meet the requirement of an engine on the EGR rate, and simultaneously, the opening of the mixing valve is adjusted to control the flow of fresh air entering the connecting piece, and a bent pipe is provided with conductive control, so that a leakage amount at a front interface and a rear interface of the bent pipe can be detected, and meanwhile, the pressure of a crankcase can be monitored; the temperature sensor detects the temperature of the exhaust gas cooled by the EGR cooler, transmits a temperature signal to the engine controller ECU, adjusts the intelligent thermal management system through the engine controller ECU, adjusts the cooling water flow entering the EGR cooler, ensures that the EGR cooler always works in the most appropriate working condition, can effectively control the temperature of the exhaust gas after passing through the EGR cooler, and avoids high-temperature gas from entering the air compressing end of the supercharger.
Drawings
The invention is further described below with reference to the accompanying drawings and examples:
FIG. 1 is a schematic (positive) diagram of the structure of the present invention;
FIG. 2 is a schematic view of the structure of the present invention;
FIG. 3 is a schematic (positive) view of the structure of the connector of the present invention;
FIG. 4 is a schematic view of the structure of the connector of the present invention;
FIG. 5 is a schematic front view of the connector (first connector side) according to the present invention;
FIG. 6 is a schematic view of the A-A structure of FIG. 5 according to the present invention.
Detailed Description
Fig. 1 is a schematic structural diagram of the present invention, as shown in the drawing, the EGR system in this embodiment includes a connecting member 11, a through hole i 18 is formed on the connecting member 11, the transverse direction is the direction of the central axis of the through hole i 18, the front side is the direction close to one side of the mixing valve, and on the contrary, the front end of the through hole i 18 forms a first connecting end 19, the rear end of the through hole i 18 forms a second connecting end 20, the circumferential outer wall of the connecting member 11 extends outwards to form a valve seat, a through hole ii 21 connected to the through hole i 18 is formed on the valve seat, the height direction is the direction of the central axis of the through hole ii 21, and a through hole iii 22 connected to the through hole i 18 is also formed on the connecting member 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, and the opposite direction is the outer direction, and the description is omitted here;
further comprising an EGR valve 10 and an EGR cooler 8, said EGR cooler 8 being fitted to the valve seat by means of the EGR valve 10, said EGR valve 10 being adapted to regulate the recirculating exhaust gases discharged through the EGR cooler 8 to the through-hole i 18;
the mixing valve 14 and the supercharger are arranged at the first connecting end 19 through the mixing valve 14, and the mixing valve 14 is used for adjusting the fresh air discharged to the through hole I18 through the supercharger;
the crankcase ventilation device further comprises a one-way valve 4 and a bent pipe, wherein the bent 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 crankcase ventilation discharged to the through hole I18 through the bent pipe;
the EGR cooler 8 has an air inlet end and an air outlet end, and the air outlet end is positioned at the top of the air inlet end, so that the reflux 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 freezes at low temperature can be solved, and the failure rate of the engine is reduced.
In this embodiment, the use of the connecting piece 11 can improve the air flow intercommunication and ensure the stability of the air flow pressure; through the arrangement of the connecting pieces 11, the assembly efficiency of each accessory part can be improved, when the accessory parts are subjected to interface conversion, only the added connecting pieces are required to be correspondingly adjusted, so that the assembly of each accessory part in an EGR system can be met, the adjustment is generally only the adjustment of the size and the positioning position of the interface, the assembly requirement of the connecting pieces on each component can be met without secondary die opening, the modification of a formed die is avoided, and the development cost is reduced;
In this embodiment, the mounting surface of the first connecting end 19 is perpendicular to the mounting surface of the valve seat. The structural compactness and the structural stability are improved. The installation face of first link is along transversely sunken formation seal groove backward, the seal groove is encircleing in the annular of through-hole I circumference, set up sealing member/sealing material in the seal groove, sealing member in this scheme is O type seal rubber ring, improves the sealing degree of connecting piece in junction, the opening has been seted up to the circumference lateral wall of seal groove, and the effect of this opening lies in providing locate function for the accessory that waits to install for each installation component 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 sealing degree of structure installation. The air inlet of the pressure end of the supercharger is sleeved by a rubber pipe and is in sealing installation with the second connecting end of the connecting piece 11 in a mode of matching with the clamping hoop for locking, the sealing performance of the corresponding interface can be further improved by the arrangement of sealing protrusions, the air tightness of the interface can be improved by matching with the clamping hoop for locking, the clamping hoop is not shown in the figure, any annular clamping hoop in the prior art is selected for completing the sealing of the rubber pipe at the second connecting end 1, and the sealing is not repeated here.
In this embodiment, the through hole ii 21 is opened 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, and the through hole iii 22 is opened 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 corresponding mutually perpendicular relationship, and the meaning of mutually perpendicular two by two is that the central axis of the through hole i3 is perpendicular to the central axis of the through hole ii 4, the central axis of the through hole i3 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 will not be repeated herein. The interoperability of air flow is improved, and the stability of air flow pressure is ensured; the through hole II is a cylindrical through hole with equal diameter, which is arranged in parallel with the height direction, and is close to the second connecting end in the transverse direction, so that the gas storage space of the gas inlet of the first connecting end is improved, and the effect of increasing the gas pressure is achieved.
In this embodiment, the front end of the through hole i 18 extends from front to back to form a taper shape with a large front end and a small rear end, the farthest end of the taper shape with a small rear end does not exceed the central axis of the through hole ii 21, as shown in the figure, the connecting piece is manufactured by adopting an integrated process, the front end of the through hole i is tapered, and can further increase the gas pressure, and the gas pressure is more stable by matching with two vertical gas outlets, so that the gas supply to each gas outlet is more stable, and the necessity and effectiveness of the use of the connecting piece are improved; the furthest end of the conical small diameter end extending transversely and backwards does not exceed the central axis of the through hole II, so that the structural strength is improved, the application advantages 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 rearward in a tubular shape, the inner wall of the tubular 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, an upper mounting portion and a lower mounting portion are formed on the connecting member, and the upper mounting portion and the lower mounting portion are located on the same side of the central axis of the through hole i at different times in the height direction. As shown in the figure, in this scheme, go up the installation department and the installation department down correspond respectively in the upside and the downside of through-hole I central axis in the direction of height to go up the installation department and form in the top surface of connecting piece body direction of height, the installation department forms in the bottom surface of connecting piece body direction of height down, go up the installation department and the installation department down the effect of installation department in order to provide the installation position for the annex, guarantee compactibility, as shown in the figure, on the transverse projection go up installation department and installation department down and all constitute sharp angular structure, improve the annex and correspond the reliability of installing on installation department and the installation intensity on the connecting piece body down.
In this embodiment, the air conditioner 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 the through hole i 18 through a differential pressure sensor low-pressure pipe 12. The integrated level of the EGR assembly is higher, 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, the monitoring path is shortened, the structure compactness is improved, and the detection precision is improved.
In this embodiment, the EGR cooler 8 is mounted at a preset position by a bracket. As shown in the figure, the EGR cooler is arranged at a preset position through the bracket in a vertical arrangement mode, so that the adhesion of return water on the EGR valve is reduced, the freezing phenomenon of the EGR valve can not occur, the failure rate is greatly reduced, and the engine performance is better.
In this embodiment, the second connecting end 20 is provided with a moisture separator 17, and the moisture separator 17 forms a plug for the second connecting end 20, so that the gas in the through hole i 18 is discharged to the set environment through the moisture separator 17. The set environment is the air compressing 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, remove the blocked water and ensure the high-efficiency combustion of the engine.
In this embodiment, the water located in the through-hole i 18 is discharged to the intake end of the EGR cooler 8 via the water separator 17. The use of accessory parts is reduced, and the failure rate is reduced.
In this embodiment, the EGR temperature sensor 9 is further included, and the EGR temperature sensor 9 is disposed at the outlet end of the EGR cooler 8. The temperature of the exhaust gas cooled by the EGR cooler 8 is detected by the EGR temperature sensor 9, a temperature signal is transmitted to the engine controller ECU, the intelligent thermal management system is regulated by the engine controller ECU, the flow of cooling water entering the EGR cooler 8 is regulated, the EGR cooler 8 is ensured to work in the most proper working condition all the time, the temperature of the exhaust gas cooled by the EGR cooler 8 can be effectively controlled, and high-temperature gas is prevented from entering the air compressing end of the supercharger.
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 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 air inlet pipe 7, an EGR cooler bracket 5, a sealing gasket and the like, wherein the EGR valve 10 adopts a butterfly valve, has a larger opening degree, can effectively improve the flow rate of exhaust gas, improves the EGR rate, an inlet of the EGR valve 10 is directly connected with the EGR cooler 8, a reducing pipeline is connected, an outlet of the EGR valve 10 is directly connected with an interface of the EGR valve 10 of the connecting piece 11, a mixing valve 14 is directly connected with an interface of the mixing valve 14 of the connecting piece 11, the waste 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 the air filter and the mixing valve 14, and the crankcase enters the connecting piece 11 after passing through the oil-gas separator and the water-gas separator 11, and three-way gas is mixed at the connecting piece 11, and the mixed gas enters the pressure-boosting end of the air separator 17; one end of a high-pressure pipe 13 of the differential pressure sensor is connected with the EGR cooler 8, one end of the high-pressure pipe is connected with a high-pressure air inlet of the differential pressure sensor 1, one end of a low-pressure pipe 12 of the differential pressure sensor is connected with the connecting piece 11, and one end of the low-pressure pipe is connected with a low-pressure air outlet of the differential pressure sensor 1; 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 check valve 4 and the moisture separator 17 are integrally disposed in the connection member 11, and the disposition space can be effectively reduced.
Control strategy of EGR system: the differential pressure sensor 1 monitors a pressure difference of mixed gas in a connecting piece 11 between the front part of the EGR valve 10 and the rear part of the mixing valve 14 after exhaust gas passes through the EGR cooler 8, is different from the traditional method of only detecting the differential pressure of the front and rear exhaust gas of the EGR valve 10, transmits the differential pressure signal to the engine controller ECU, adjusts an opening of the EGR valve 10 through the engine controller ECU so as to meet the requirement of an engine on the EGR rate, and simultaneously adjusts an opening of the mixing valve 14 to control the flow of fresh air into the connecting piece 11, and the curved pipe is provided with conductive control, so that a leakage amount at a front interface and a rear interface of the curved pipe can be detected, and meanwhile, the pressure of a crank box can be monitored; the temperature of the exhaust gas cooled by the EGR cooler 8 is detected by the EGR temperature sensor 9, a temperature signal is transmitted to the engine controller ECU, the intelligent thermal management system is regulated by the engine controller ECU, the flow of cooling water entering the EGR cooler 8 is regulated, the EGR cooler 8 is ensured to always work under the most suitable working condition, the temperature of the exhaust gas after passing through the EGR cooler 8 can be effectively controlled, and high-temperature gas is prevented from entering the air compressing end of the supercharger; the corresponding connection mode, control mode and communication mode of each component and system connected with the ECU belong to the prior art, and are not repeated here; 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 technical protection point and the advantages of the invention are as follows:
1. the whole EGR system is vertically arranged, and the connecting piece 11 is simultaneously and directly connected with the EGR valve 10, the mixing valve 14 and the curved pipe, so that 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, and the water-gas separator 17 is integrally arranged in the connecting piece 11, so that the water entering the cylinder of the engine can be reduced, and the efficient combustion of the engine is ensured;
2. the whole EGR system is vertically arranged, and moisture separated by the moisture separator 17 cannot remain in the connecting piece 11, the EGR valve 10 and the EGR cooler 8 and can directly flow back to the exhaust system to be discharged, so that the problem of freezing 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 crank pipe can only flow into the connecting piece 11 in one way, the mixed gas in the connecting piece 11 cannot flow into the crank pipe, and the pressure of a crank box is ensured;
the differential pressure sensor 1 detects the differential pressure of the mixed gas in the exhaust gas and the connecting piece 11 before the EGR valve 10 behind the EGR cooler 8, so that the opening degrees of the EGR valve 10 and the mixing valve 14 can be simultaneously controlled by the differential pressure signal through the engine controller ECU.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and 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 and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (9)
1. An EGR system characterized by: the connecting piece comprises a connecting piece, wherein a through hole I which is transversely communicated 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 peripheral 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 exhaust gas recirculation system further comprises an EGR valve and an EGR cooler, wherein 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 mixing valve is used for adjusting fresh air discharged to the through hole I through the supercharger; the crank case is characterized by further comprising a one-way valve and a crank tube, wherein the crank tube is communicated with the through hole III through the one-way valve, and the one-way valve is used for adjusting crankcase gas discharged to the through hole I through the crank tube; the EGR cooler is provided with an air inlet end and an air outlet end, and the air outlet end is positioned at the top of the air inlet end; the exhaust gas recirculation system further comprises a differential pressure sensor, wherein the differential pressure sensor is communicated to the air outlet end of the EGR cooler through a high-pressure pipe of the differential pressure sensor, and the differential pressure sensor is communicated to the through hole I through a low-pressure pipe of the differential pressure sensor.
2. The EGR system of claim 1, wherein: the EGR cooler is mounted in a preset position by means of a bracket.
3. The EGR system of claim 1, wherein: the second connecting end is provided with a water-gas separator, and the water-gas separator 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.
4. An EGR system according to claim 3, characterized in that: the water in the through hole I is discharged to the air inlet end of the EGR cooler through the water vapor separator.
5. The EGR system of claim 1, wherein: the system further comprises an EGR temperature sensor, wherein the EGR temperature sensor is arranged at the air outlet end of the EGR cooler.
6. The EGR system of claim 1, wherein: the mounting surface of the first connecting end is perpendicular to the mounting surface of the valve seat.
7. The EGR system of claim 1, wherein: the through holes II are arranged in parallel to the height direction, so that the central axis of the through holes I is vertical to the central axis of the through holes II, and the through holes III are arranged in parallel to the longitudinal direction, so that the central axis of the through holes III, the central axis of the through holes II and the central axis of the through holes I are in a corresponding mutually perpendicular relation.
8. The EGR system of claim 7, wherein: the transverse front end of the through hole I is in a cone shape with a large front end and a small rear end extending from front to back, and the farthest end of the cone-shaped small-diameter end extending transversely to back does not exceed the central axis of the through hole II.
9. The EGR system of claim 8, wherein: the second connecting end is formed by extending the transverse rear side of the connecting piece in a barrel-shaped mode backwards, the inner wall of the barrel-shaped mode forms the transverse rear section of the through hole I, and the second connecting end extends outwards along the transverse rear circumferential outer wall to form an annular sealing bulge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211341129.XA CN115492704B (en) | 2022-10-30 | 2022-10-30 | EGR system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211341129.XA CN115492704B (en) | 2022-10-30 | 2022-10-30 | EGR system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115492704A CN115492704A (en) | 2022-12-20 |
| CN115492704B true CN115492704B (en) | 2024-04-23 |
Family
ID=85115252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211341129.XA Active CN115492704B (en) | 2022-10-30 | 2022-10-30 | EGR system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115492704B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008169712A (en) * | 2007-01-09 | 2008-07-24 | Mitsubishi Heavy Ind Ltd | Engine with egr system |
| JP2010077833A (en) * | 2008-09-24 | 2010-04-08 | Toyota Industries Corp | Exhaust gas recirculation system |
| CN102322373A (en) * | 2011-08-01 | 2012-01-18 | 高万盛 | Air cleaner dedusting and purifying system |
| JP2013245589A (en) * | 2012-05-24 | 2013-12-09 | Aisan Industry Co Ltd | Exhaust gas recirculation apparatus for engine |
| CN103827474A (en) * | 2011-11-10 | 2014-05-28 | 本田技研工业株式会社 | Internal combustion engine intake control apparatus |
| CN204436572U (en) * | 2015-01-22 | 2015-07-01 | 潍柴西港新能源动力有限公司 | A kind of natural gas engine low pressure EGR system |
| CN108612603A (en) * | 2018-04-18 | 2018-10-02 | 上汽通用汽车有限公司 | Combination cooling gas recirculation system |
| CN112211756A (en) * | 2020-09-26 | 2021-01-12 | 昆明云内动力股份有限公司 | Low-pressure EGR system and gas flow control method |
| CN214464594U (en) * | 2021-03-15 | 2021-10-22 | 长城汽车股份有限公司 | Low pressure EGR system and vehicle |
| CN215633417U (en) * | 2021-06-28 | 2022-01-25 | 广西玉柴机器股份有限公司 | EGR pipeline arrangement of natural gas engine |
| CN115045780A (en) * | 2022-06-10 | 2022-09-13 | 哈尔滨东安汽车动力股份有限公司 | Arrangement structure for increasing low-pressure EGR (exhaust gas recirculation) coverage working condition |
| CN115045781A (en) * | 2022-06-10 | 2022-09-13 | 哈尔滨东安汽车动力股份有限公司 | Low-pressure cooling EGR system capable of achieving high EGR rate |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2981408B1 (en) * | 2011-10-12 | 2013-10-18 | IFP Energies Nouvelles | METHOD FOR CONTROLLING AN INTEGRATED VALVE IN AN ENGINE EXHAUST GAS RECIRCULATION CIRCUIT |
| US10914251B2 (en) * | 2017-12-22 | 2021-02-09 | Ford Global Technologies, Llc | Systems and methods for EGR valve diagnostics |
| JP7352136B2 (en) * | 2019-06-06 | 2023-09-28 | マツダ株式会社 | engine control device |
-
2022
- 2022-10-30 CN CN202211341129.XA patent/CN115492704B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008169712A (en) * | 2007-01-09 | 2008-07-24 | Mitsubishi Heavy Ind Ltd | Engine with egr system |
| JP2010077833A (en) * | 2008-09-24 | 2010-04-08 | Toyota Industries Corp | Exhaust gas recirculation system |
| CN102322373A (en) * | 2011-08-01 | 2012-01-18 | 高万盛 | Air cleaner dedusting and purifying system |
| CN103827474A (en) * | 2011-11-10 | 2014-05-28 | 本田技研工业株式会社 | Internal combustion engine intake control apparatus |
| JP2013245589A (en) * | 2012-05-24 | 2013-12-09 | Aisan Industry Co Ltd | Exhaust gas recirculation apparatus for engine |
| CN204436572U (en) * | 2015-01-22 | 2015-07-01 | 潍柴西港新能源动力有限公司 | A kind of natural gas engine low pressure EGR system |
| CN108612603A (en) * | 2018-04-18 | 2018-10-02 | 上汽通用汽车有限公司 | Combination cooling gas recirculation system |
| CN112211756A (en) * | 2020-09-26 | 2021-01-12 | 昆明云内动力股份有限公司 | Low-pressure EGR system and gas flow control method |
| CN214464594U (en) * | 2021-03-15 | 2021-10-22 | 长城汽车股份有限公司 | Low pressure EGR system and vehicle |
| CN215633417U (en) * | 2021-06-28 | 2022-01-25 | 广西玉柴机器股份有限公司 | EGR pipeline arrangement of natural gas engine |
| CN115045780A (en) * | 2022-06-10 | 2022-09-13 | 哈尔滨东安汽车动力股份有限公司 | Arrangement structure for increasing low-pressure EGR (exhaust gas recirculation) coverage working condition |
| CN115045781A (en) * | 2022-06-10 | 2022-09-13 | 哈尔滨东安汽车动力股份有限公司 | Low-pressure cooling EGR system capable of achieving high EGR rate |
Non-Patent Citations (1)
| Title |
|---|
| 低压EGR系统对缸内直喷发动机性能影响的研究;张盼望;熊锐;吴坚;张中威;纪佳圳;李沛焕;;广东工业大学学报;20200915(05);第86-90页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115492704A (en) | 2022-12-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103670833A (en) | Air intake manifold of diesel engine | |
| CN115492704B (en) | EGR system | |
| CN207892732U (en) | Low pressure EGR apparatus and engine with the low pressure EGR apparatus | |
| CN206267982U (en) | Automotive gasoline engine cools down egr system | |
| CN214331629U (en) | Normal-temperature valve for automobile intercooler | |
| CN206448886U (en) | Cooling system for recycled exhaust gas | |
| CN211059571U (en) | Three-way pipe connecting structure used in EGR pipeline | |
| CN115045781A (en) | Low-pressure cooling EGR system capable of achieving high EGR rate | |
| CN111577494B (en) | Intake manifold with waste gas inlet hole | |
| CN205047312U (en) | Motorcycle electronic fuel injection system | |
| CN212225381U (en) | Engine supercharger pressure relief system | |
| CN210264958U (en) | Diesel engine EGR system | |
| CN210217949U (en) | Fuel steam desorption pipeline structure for automobile | |
| CN218750300U (en) | Fuel tank pipeline mounting structure | |
| CN209781088U (en) | Can guarantee air intake manifold structure of leakproofness | |
| CN205477993U (en) | Control by temperature change EGR valve | |
| CN218816689U (en) | Venturi tube device of supercharged engine | |
| CN204060982U (en) | Embedded waste gas recirculation heat-exchanger shell | |
| CN215860562U (en) | Gas engine air inlet mixing device | |
| CN112096543B (en) | EGR system and car | |
| CN219638930U (en) | Exhaust manifold of integrated exhaust gas recirculation passageway | |
| CN219974601U (en) | Crankcase ventilation system, engine and vehicle | |
| CN114810279B (en) | Crankcase ventilation system and vehicle with same | |
| CN220168049U (en) | Novel EGR valve control device of diesel engine | |
| CN220487690U (en) | Engine crankcase ventilation system, engine and vehicle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |