CN110645105A - Engine - Google Patents
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- Publication number
- CN110645105A CN110645105A CN201910860444.5A CN201910860444A CN110645105A CN 110645105 A CN110645105 A CN 110645105A CN 201910860444 A CN201910860444 A CN 201910860444A CN 110645105 A CN110645105 A CN 110645105A
- Authority
- CN
- China
- Prior art keywords
- exhaust
- engine
- back pressure
- air inlet
- egr
- 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.)
- Pending
Links
- 230000001105 regulatory effect Effects 0.000 claims description 17
- 239000003054 catalyst Substances 0.000 claims description 5
- 238000002485 combustion reaction Methods 0.000 abstract description 12
- 230000006872 improvement Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 14
- 238000005516 engineering process Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000004044 response Effects 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
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
- F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/101—Three-way catalysts
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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
- F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
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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
- F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
- F02M26/16—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system with EGR valves located at or near the connection to the exhaust system
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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)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Toxicology (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses an engine, which comprises an exhaust system, an air inlet system and an EGR valve connected with the exhaust system and the air inlet system, wherein when the pressure difference between the exhaust system and the air inlet system reaches a set value, the exhaust back pressure of the exhaust system is increased so as to increase the amount of exhaust gas entering the air inlet system through the EGR valve. The engine provided by the invention achieves the purposes of increasing exhaust back pressure and realizing higher EGR rate under the working conditions of low rotating speed and high load of the engine, and has the advantages of simple and reliable scheme, improvement on the combustion economy of the engine and high economy of the engine.
Description
Technical Field
The present invention relates to an engine.
Background
Because of the stricter and stricter regulations, the requirements for the oil consumption and the emission of the engine are higher and higher, the application of an EGR (exhaust Gas recirculation) technology becomes an important technical means for reducing the oil consumption and the emission of the current gasoline engine, and the combustion economy of the engine is improved while the emission of NOx is obviously reduced.
EGR technology is currently widely used in gasoline engines. Gasoline engines are divided into naturally aspirated engines and supercharged engines, both of which suffer from a problem when EGR technology is used: when the engine runs at low speed and medium and high load, the exhaust pressure of the engine is low, the exhaust energy is weak, the air intake system is not provided with enough negative pressure due to the fact that the throttle valve body is close to full opening, the pressure difference between the air intake system and the exhaust system is small, and even if the EGR valve is completely opened, little exhaust gas in the exhaust system can enter the air intake system again to participate in combustion. Although the engine has the potential of continuously increasing the EGR gas, the exhaust gas pressure is close to that of the inlet gas, so that insufficient exhaust gas can enter an air inlet system, and the requirement of the engine for reducing the oil consumption cannot be met.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. To this end, the invention provides an engine with the aim of improving the engine combustion economy.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the engine comprises an exhaust system, an air inlet system and an EGR valve connected with the exhaust system and the air inlet system, and when the pressure difference between the exhaust system and the air inlet system reaches a set value, the exhaust back pressure of the exhaust system is increased so as to increase the amount of exhaust gas entering the air inlet system through the EGR valve.
The exhaust system includes an exhaust manifold and an exhaust back pressure regulating valve connected to the exhaust manifold, and the EGR valve is connected to the exhaust manifold through an EGR pipe that guides exhaust gas from the exhaust manifold to the EGR valve.
When the opening degree of the exhaust back pressure regulating valve is gradually reduced, the exhaust back pressure of the exhaust system is gradually increased, and the pressure difference between the exhaust system and the air inlet system is gradually increased.
The exhaust system further comprises a three-way catalyst connected with the exhaust back pressure regulating valve.
The engine provided by the invention achieves the purposes of increasing exhaust back pressure and realizing higher EGR rate under the working conditions of low rotating speed and high load of the engine, and has the advantages of simple and reliable scheme, improvement on the combustion economy of the engine and high economy of the engine.
Drawings
FIG. 1 is a schematic illustration of the engine of the present invention;
the labels in the above figures are: 1. an air intake system; 2. an exhaust manifold; 3. an exhaust back pressure regulating valve; 4. a three-way catalyst; 5. an EGR conduit; 6. an EGR valve.
Detailed Description
The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings for a purpose of helping those skilled in the art to more fully, accurately and deeply understand the concept and technical solution of the present invention and to facilitate its implementation.
As shown in fig. 1, the present invention provides an engine including an exhaust system, an intake system 1, and an EGR valve 6 connected to the exhaust system and the intake system 1, wherein when a pressure difference between the exhaust system and the intake system 1 reaches a set value, an exhaust back pressure of the exhaust system is increased to increase an amount of exhaust gas entering the intake system 1 through the EGR valve 6.
Specifically, as shown in fig. 1, the exhaust system includes an exhaust manifold 2 and an exhaust back pressure regulating valve 3 connected to the exhaust manifold 2, an EGR valve 6 is connected to the exhaust manifold 2 through an EGR pipe 5, and the EGR pipe 5 guides exhaust gas from the exhaust manifold 2 to the EGR valve 6. One end of the EGR pipe 5 is connected to the exhaust manifold 2, the other end of the EGR pipe 5 is connected to an intake port of the EGR valve 6, and an exhaust port of the EGR valve 6 is connected to the intake system 1. When the engine works normally, the air intake system 1 guides fresh air to the combustion chamber for combustion, waste gas generated by combustion is discharged out of the engine through the exhaust system, when the engine needs to apply an EGR technology, the EGR valve 6 opens the opening degree of response according to requirements, and the waste gas generated by the combustion of the engine reenters the air intake system 1 through the EGR pipeline 5 and the EGR valve 6 to participate in the combustion so as to reduce the oil consumption of the engine.
As shown in fig. 1, when the opening degree of the exhaust back pressure regulating valve 3 is gradually decreased, the exhaust back pressure of the exhaust system is gradually increased, the pressure difference between the exhaust system and the intake system 1 is gradually increased, the exhaust back pressure of the exhaust system is increased, and the pressure difference between the exhaust system and the intake system 1 exceeds a set value, so that the amount of the exhaust gas entering the intake system 1 through the EGR valve 6 can be increased, and more exhaust gas in the exhaust system enters the intake system 1 again to participate in combustion.
When the engine runs at a low rotating speed and a high load, the pressure value of the air inlet system 1 is close to the pressure value of the exhaust system, the pressure difference between the air inlet system 1 and the exhaust system is small, the exhaust back pressure regulating valve 3 is gradually closed at the moment, namely the opening degree of the exhaust back pressure regulating valve 3 is controlled to be gradually reduced, the exhaust back pressure of the engine is slowly adjusted, the exhaust back pressure is gradually increased, the pressure difference between the air inlet system 1 and the exhaust system is also gradually increased, at the moment, under the condition of the same opening degree of the EGR valve, the amount of exhaust gas which can reenter the air inlet system 1 to participate in combustion is also gradually increased, the EGR rate of the engine is also correspondingly increased.
As shown in fig. 1, the exhaust system further includes a three-way catalyst 4 connected to the exhaust back pressure regulating valve 3, the three-way catalyst 4 is connected to an outlet of the exhaust back pressure regulating valve 3, and an inlet of the exhaust back pressure regulating valve 3 is connected to the exhaust manifold 2.
Compared with the prior art, the engine with the balance has the following advantages:
1. high EGR rate: under the conditions that the engine is in low rotating speed and medium and high load working conditions and the EGR rate cannot be increased by utilizing the opening of the EGR valve, the increase of the pressure difference of an air inlet and exhaust system of the engine is realized by a method of adjusting the exhaust back pressure, the exhaust gas quantity of the EGR system is increased, and the EGR rate of the corresponding working condition is increased;
2. the method is simple: the working principle is simple, the design is easy to realize, the change of the engine is not large, and higher emission and fuel economy can be realized due to high EGR rate;
3. the cost is low: the EGR working condition capacity is improved only by one exhaust back pressure regulating valve 3 and regulating the exhaust back pressure by the exhaust back pressure regulating valve 3, and the EGR working condition capacity is economical and reliable;
4. good fuel economy: because the exhaust system with the adjustable exhaust back pressure is adopted, the EGR rate of the engine can be increased under the working condition that part of the EGR rate is not high, the pumping loss of the engine is reduced, and the economy of the engine is improved.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (4)
1. An engine comprising an exhaust system, an intake system and an EGR valve connected to the exhaust system and the intake system, characterized in that: when the pressure difference between the exhaust system and the air inlet system reaches a set value, the exhaust back pressure of the exhaust system is increased so as to increase the amount of exhaust gas entering the air inlet system through the EGR valve.
2. The engine of claim 1, wherein: the exhaust system includes an exhaust manifold and an exhaust back pressure regulating valve connected to the exhaust manifold, and the EGR valve is connected to the exhaust manifold through an EGR pipe that guides exhaust gas from the exhaust manifold to the EGR valve.
3. The engine of claim 2, wherein: when the opening degree of the exhaust back pressure regulating valve is gradually reduced, the exhaust back pressure of the exhaust system is gradually increased, and the pressure difference between the exhaust system and the air inlet system is gradually increased.
4. An engine according to claim 2 or 3, characterized in that: the exhaust system further comprises a three-way catalyst connected with the exhaust back pressure regulating valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910860444.5A CN110645105A (en) | 2019-09-11 | 2019-09-11 | Engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910860444.5A CN110645105A (en) | 2019-09-11 | 2019-09-11 | Engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110645105A true CN110645105A (en) | 2020-01-03 |
Family
ID=68991201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910860444.5A Pending CN110645105A (en) | 2019-09-11 | 2019-09-11 | Engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110645105A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205013157U (en) * | 2015-09-25 | 2016-02-03 | 重庆长安汽车股份有限公司 | Engine exhaust recirculation system |
| CN206274285U (en) * | 2016-12-23 | 2017-06-23 | 西华大学 | A kind of experiment porch suitable for dual fuel engine |
| CN108167095A (en) * | 2016-12-07 | 2018-06-15 | 北京汽车动力总成有限公司 | A kind of internal combustion engine cold start-up gas-circulating system and automobile |
| DE102017205697A1 (en) * | 2017-04-04 | 2018-10-04 | Volkswagen Aktiengesellschaft | Exhaust after-treatment system for an internal combustion engine and internal combustion engine |
| CN109252988A (en) * | 2018-09-13 | 2019-01-22 | 中国第汽车股份有限公司 | A kind of gasoline single cylinder engine EGR realization device and its application method |
| CN109611242A (en) * | 2019-01-28 | 2019-04-12 | 天津大学 | A kind of high-efficiency cleaning burning diesel |
| WO2019166529A1 (en) * | 2018-02-28 | 2019-09-06 | Tenneco Gmbh | Low-pressure egr system with turbo bypass |
-
2019
- 2019-09-11 CN CN201910860444.5A patent/CN110645105A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205013157U (en) * | 2015-09-25 | 2016-02-03 | 重庆长安汽车股份有限公司 | Engine exhaust recirculation system |
| CN108167095A (en) * | 2016-12-07 | 2018-06-15 | 北京汽车动力总成有限公司 | A kind of internal combustion engine cold start-up gas-circulating system and automobile |
| CN206274285U (en) * | 2016-12-23 | 2017-06-23 | 西华大学 | A kind of experiment porch suitable for dual fuel engine |
| DE102017205697A1 (en) * | 2017-04-04 | 2018-10-04 | Volkswagen Aktiengesellschaft | Exhaust after-treatment system for an internal combustion engine and internal combustion engine |
| WO2019166529A1 (en) * | 2018-02-28 | 2019-09-06 | Tenneco Gmbh | Low-pressure egr system with turbo bypass |
| CN109252988A (en) * | 2018-09-13 | 2019-01-22 | 中国第汽车股份有限公司 | A kind of gasoline single cylinder engine EGR realization device and its application method |
| CN109611242A (en) * | 2019-01-28 | 2019-04-12 | 天津大学 | A kind of high-efficiency cleaning burning diesel |
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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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200103 |
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| RJ01 | Rejection of invention patent application after publication |