CN111794881B - High-pressure cooling EGR system without independent cooler - Google Patents
High-pressure cooling EGR system without independent cooler Download PDFInfo
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- CN111794881B CN111794881B CN202010539231.5A CN202010539231A CN111794881B CN 111794881 B CN111794881 B CN 111794881B CN 202010539231 A CN202010539231 A CN 202010539231A CN 111794881 B CN111794881 B CN 111794881B
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- pipe
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- 238000001816 cooling Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 31
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 230000004075 alteration Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 230000005465 channeling Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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
- F02M26/13—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
- 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
- F02B29/0437—Liquid cooled heat exchangers
-
- 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
- F02B29/045—Constructional details of the heat exchangers, e.g. pipes, plates, ribs, insulation, materials, or manufacturing and assembly
- F02B29/0462—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
- 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
- F02B29/045—Constructional details of the heat exchangers, e.g. pipes, plates, ribs, insulation, materials, or manufacturing and assembly
- F02B29/0475—Constructional details of the heat exchangers, e.g. pipes, plates, ribs, insulation, materials, or manufacturing and assembly the intake air cooler being combined with another device, e.g. heater, valve, compressor, filter or EGR cooler, or being assembled on a special engine location
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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
-
- 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)
- Thermal Sciences (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
The present invention provides a high pressure cooled EGR system without an independent cooler, comprising: the air filter is arranged at the inlet of the first air inlet pipe, the flowmeter is fixedly connected with the first air inlet pipe, the throttle valve is arranged at the front end of the second air inlet pipe, and the intercooler is arranged at the rear end of the second air inlet pipe, and the outlet of the first air inlet pipe is communicated with the inlet of the second air inlet pipe; the outlet of the second air inlet pipe is communicated with the inlet of an air inlet main pipe of the engine, the outlet of an air outlet main pipe of the engine is communicated with the inlet of a first air outlet pipe, and the middle end of the first air outlet pipe is also communicated with the inlet of a second air outlet pipe; the front end of the second exhaust pipe is provided with a purifier, and the middle end of the second exhaust pipe is provided with an EGR valve; compared with the existing EGR system, the high-pressure cooling EGR system without the independent cooler provided by the invention has the advantages that the EGR cooler is omitted, and the use cost of a user is reduced.
Description
Technical Field
The invention belongs to the technical field of engines, and particularly relates to a high-pressure cooling EGR system without an independent cooler.
Background
The design of the existing EGR (exhaust gas recirculation) system consists of an EGR cooler, an EGR valve and an EGR pipeline, under the control of the EGR valve, part of exhaust gas of an engine enters an engine cylinder through the EGR pipeline and the EGR cooler and the EGR valve to participate in the combustion process, and the main technical defects are that:
an additional cooler is required to reduce the temperature of the exhaust gases, but the exhaust gas temperature after the cooler is much higher than the fresh air temperature after the engine has been cooled. When the waste gas and the fresh air are mixed, the temperature is raised by 15 ℃ at maximum (the temperature reaches 65 ℃ after the maximum mixing), so that the quality of the air working medium entering the cylinder is reduced. At the same time, specially equipped, self-contained EGR (exhaust gas recirculation) coolers also increase the production costs of the enterprise and the costs of maintenance for the user.
The water vapor in the EGR exhaust gas may condense into a liquid state in a low temperature environment. When the engine is in a low-temperature environment, after the engine is stopped, the temperature of the pipeline is reduced, condensed water is separated out and frozen, and serious faults such as pipeline blockage, EGR valve clamping stagnation and the like can be caused.
Because of the short pipeline of the air inlet main pipe, a special mixer is required to be designed for part of machine types to strengthen the mixing uniformity of the waste gas and the fresh air. This increases the flow resistance on the one hand and the production costs on the other hand.
The chinese patent publication No. CN104727986a discloses an exhaust gas recovery apparatus for an EGR cooler of a vehicle, comprising: a branch conduit for diverting exhaust gas discharged from the exhaust gas recirculation cooler to a turbocharger; a flow control valve installed in the branch pipe for adjusting a flow rate of the exhaust gas; and a control unit for controlling an opening angle of the flow control valve.
From the above, it has been found that the prior art, which is specially equipped with a separate EGR (exhaust gas recirculation) cooler, may cause serious failures such as pipe blockage and stuck EGR valve.
Disclosure of Invention
The invention aims to provide a high-pressure cooling EGR system without an independent cooler, which aims to solve the problems that in the prior art, the independent EGR (exhaust gas recirculation) cooler is specially arranged, so that serious faults such as pipeline blockage and EGR valve clamping stagnation are caused.
In order to achieve the technical purpose and the technical effect, the invention is realized by the following technical scheme:
the present invention provides a high pressure cooled EGR system without an independent cooler, comprising: the air filter is arranged at the inlet of the first air inlet pipe, the flowmeter is fixedly connected with the first air inlet pipe, the throttle valve is arranged at the front end of the second air inlet pipe, the intercooler is arranged at the rear end of the second air inlet pipe, and the outlet of the first air inlet pipe is communicated with the inlet of the second air inlet pipe through the pressure shell of the supercharger; the outlet of the second air inlet pipe is communicated with the inlet of an air inlet main pipe of the engine, the outlet of an air outlet main pipe of the engine is communicated with the inlet of a first air outlet pipe, and the middle end of the first air outlet pipe is also communicated with the inlet of a second air outlet pipe; the front end of the second exhaust pipe is provided with a purifier, the middle end of the second exhaust pipe is provided with an EGR valve, and the rear end of the second exhaust pipe is provided with a one-way valve; the outlet of the second exhaust pipe is also communicated with a second air inlet pipe; the outlet of the first exhaust pipe is communicated with a supercharger, and the supercharger is also communicated with the inlet of the third exhaust pipe.
Preferably, a communication position between the second exhaust pipe and the second intake pipe is provided between the intercooler and the throttle valve.
Preferably, the intercooler is further provided with an electric control fan.
The invention has the advantages that:
1. compared with the existing EGR (exhaust gas recirculation) system engine, the high-pressure cooling EGR system without the independent cooler provided by the invention has the advantages that the EGR (exhaust gas recirculation) cooler is omitted, and the use cost of a user is reduced;
2. according to the high-pressure cooling EGR system without the independent cooler, the whole-vehicle intercooler is used for cooling the mixed gas, when the water temperature of the engine and the temperature after the intercooling are high, the running rotating speed (half speed and full speed) of the fan is increased for enhancing the cooling of the intercooler, the temperature (5-15) DEG C of working media entering a cylinder is reduced, the charging efficiency can be effectively improved, the in-cylinder combustion process is improved, and the oil consumption and the particle emission are reduced;
3. according to the high-pressure cooling EGR system without the independent cooler, the whole vehicle intercooler is used for cooling the mixed gas, when the water temperature of the engine is low, the fan is controlled to run at a low speed, the cooling capacity of the intercooler is reduced, the temperature of the mixed gas entering the cylinder is increased, the mixing of oil gas in the cylinder of the cooler and the initial temperature of the combustion in the cylinder are improved, HC and CO are reduced, meanwhile, the exhaust temperature is increased, the conversion efficiency of tail gas aftertreatment is improved, and then the NOx emission at the low water temperature is controlled;
4. according to the high-pressure cooling EGR system without the independent cooler, provided by the invention, the exhaust gas and the fresh air are fully mixed by utilizing the pipeline of the intercooler, so that the mixer entering the cylinder can be fully mixed; even in a low-temperature environment, the engine is stopped to cause the EGR pipeline to be frozen, and as the system is high-temperature gas at both ends of the EGR valve, the pipeline can be heated as soon as possible by utilizing the high-temperature waste heat after the engine is started, so that the pipeline is prevented from being blocked and the EGR system is uncontrollable.
Drawings
Fig. 1 is a schematic diagram of a high pressure cooled EGR system without an independent cooler according to the present invention.
In the figure, 1 is an air filter, 2 is a flowmeter, 3a is a first air inlet pipe, 3b is a second air inlet pipe, 4 is a throttle valve, 5 is an intercooler, 6 is an engine, 7 is an air inlet main pipe, 8 is an exhaust main pipe, 9 is a first exhaust pipe, 10 is a supercharger, 11 is a purifier, 12 is an EGR valve, 13 is a one-way valve, 14 is a second exhaust pipe, 15 is an electric control fan, and 16 is a third exhaust pipe.
Detailed Description
For the purpose of making the technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail by way of specific embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In an embodiment of the present invention, there is provided a high-pressure cooled EGR system without an independent cooler, as shown in fig. 1, including: an air filter 1 arranged at the inlet of the first air inlet pipe 3a and used for filtering the sucked air, a flowmeter 2 fixedly connected with the first air inlet pipe 3a and used for measuring air flow, a throttle valve 4 arranged at the front end of the second air inlet pipe 3b and used for controlling the sucked air, and an intercooler 5 arranged at the rear end and used for reducing the temperature of the air after supercharging, (defined as a front end firstly contacted with the air and a rear end later contacted with the air according to the direction of an air flowing arrow in FIG. 1, and a position between the front end and the rear end is a middle end); the outlet of the first air inlet pipe 3a is communicated with the inlet of the second air inlet pipe 3b through a pressure shell of the supercharger 10, and the supercharger 10 can boost fresh air sucked by the first air inlet pipe 3a and then input the fresh air into the second air inlet pipe 3b; the outlet of the second air inlet pipe 3b is communicated with the inlet of the air inlet main pipe 7 of the engine 6 for sucking air, the outlet of the air outlet main pipe 8 of the engine 6 is communicated with the inlet of the first exhaust pipe 9 for discharging circulating exhaust gas, and the middle end of the first exhaust pipe 9 is also communicated with the inlet of the second exhaust pipe 14; the front end of the second exhaust pipe 14 is provided with a purifier 11 for reducing the HC and CO content in the circulating exhaust gas, the middle end of the second exhaust pipe 14 is provided with an EGR valve 12 for controlling the opening degree of a valve according to the measurement of the flowmeter 2, and the rear end of the second exhaust pipe 14 is provided with a one-way valve 13 for preventing reverse channeling of air through one-way conduction; the outlet of the second exhaust pipe 14 is also in communication with the second intake pipe 3b for mixing exhaust gases and recirculation; the outlet of the first exhaust pipe 9 is communicated with a supercharger 10 for converting heat of exhaust gas into kinetic energy to drive the supercharger 10 to do work, and the supercharger 10 is also communicated with the inlet of a third exhaust pipe 16 for discharging final combusted exhaust gas of the engine 6.
In one embodiment, a communication position of the second exhaust pipe 14 and the second intake pipe 3b is provided between the intercooler 5 and the throttle valve 4; the intercooler 5 can be used for cooling the mixed gas, when the water temperature of the engine 6 is low, the cooling capacity of the intercooler 5 is reduced, the temperature of the mixed gas entering the engine 6 cylinder is improved, the mixing of oil gas in the engine 6 cylinder and the initial temperature of combustion in the cylinder are improved, HC and CO are reduced, the exhaust temperature is simultaneously improved, the conversion efficiency of tail gas aftertreatment is improved, and then the NOx emission in the low water temperature is controlled.
In some embodiments, the intercooler 5 is further provided with an electric control fan 15, and the intercooler 5 is used for cooling the mixed gas, when the water temperature and the post-cooling temperature of the engine 6 are higher, the running speed (half speed and full speed) of the electric control fan 15 is increased to enhance the cooling of the intercooler 6, the temperature (5-15) of the working medium entering the cylinder of the engine 6 is reduced, the charging efficiency can be effectively improved, the in-cylinder combustion process is improved, and the oil consumption and the particle emission are reduced.
Reference in the specification to "some embodiments," "one embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in some embodiments," "in one embodiment," or "in an embodiment" in various places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, a particular feature, structure, or characteristic described in connection with or illustrated in one embodiment may be combined, in whole or in part, with features, structures, or characteristics of one or more other embodiments without limitation, provided that the combination is not non-logical or inoperable. Additionally, the various elements in the drawings of the subject application are for illustration purposes only and are not drawn to scale.
Having thus described several aspects of at least one embodiment of this invention, it is to be appreciated various alterations, modifications, and improvements will readily occur to those skilled in the art. Such alterations, modifications, and improvements are intended to be within the spirit and scope of the invention.
Claims (1)
1. A high pressure cooled EGR system without an independent cooler, comprising: the air filter is arranged at the inlet of the first air inlet pipe, the flowmeter is fixedly connected with the first air inlet pipe, the throttle valve is arranged at the front end of the second air inlet pipe, the intercooler is arranged at the rear end of the second air inlet pipe, and the outlet of the first air inlet pipe is communicated with the inlet of the second air inlet pipe through the pressure shell of the supercharger; the outlet of the second air inlet pipe is communicated with the inlet of an air inlet main pipe of the engine, the outlet of an air outlet main pipe of the engine is communicated with the inlet of a first air outlet pipe, and the middle end of the first air outlet pipe is also communicated with the inlet of a second air outlet pipe; the front end of the second exhaust pipe is provided with a purifier, the middle end of the second exhaust pipe is provided with an EGR valve, and the rear end of the second exhaust pipe is provided with a one-way valve; the outlet of the second exhaust pipe is also communicated with a second air inlet pipe; the outlet of the first exhaust pipe is communicated with a supercharger, and the supercharger is also communicated with the inlet of the third exhaust pipe;
the communication position of the second exhaust pipe and the second air inlet pipe is arranged between the intercooler and the throttle valve;
an electric control fan is also arranged on the intercooler;
the intercooler is used for cooling the mixed gas, when the water temperature and the intercooling temperature of the engine are higher, the running rotating speed of the electric control fan is increased to enhance the cooling of the intercooler, and the temperature of working media entering the engine cylinder is reduced by 5-15 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010539231.5A CN111794881B (en) | 2020-06-14 | 2020-06-14 | High-pressure cooling EGR system without independent cooler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010539231.5A CN111794881B (en) | 2020-06-14 | 2020-06-14 | High-pressure cooling EGR system without independent cooler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111794881A CN111794881A (en) | 2020-10-20 |
| CN111794881B true CN111794881B (en) | 2024-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010539231.5A Active CN111794881B (en) | 2020-06-14 | 2020-06-14 | High-pressure cooling EGR system without independent cooler |
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| Country | Link |
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| CN (1) | CN111794881B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016097197A1 (en) * | 2014-12-17 | 2016-06-23 | Tenneco Gmbh | Agr system with a particle filter for an otto engine |
| CN207989177U (en) * | 2018-03-15 | 2018-10-19 | 安徽江淮汽车集团股份有限公司 | Diesel engine exhaust gas recirculation system |
-
2020
- 2020-06-14 CN CN202010539231.5A patent/CN111794881B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016097197A1 (en) * | 2014-12-17 | 2016-06-23 | Tenneco Gmbh | Agr system with a particle filter for an otto engine |
| CN207989177U (en) * | 2018-03-15 | 2018-10-19 | 安徽江淮汽车集团股份有限公司 | Diesel engine exhaust gas recirculation system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111794881A (en) | 2020-10-20 |
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