CN108150318A - Engine EGR gas recirculation system and its control method - Google Patents
Engine EGR gas recirculation system and its control method Download PDFInfo
- Publication number
- CN108150318A CN108150318A CN201711279449.6A CN201711279449A CN108150318A CN 108150318 A CN108150318 A CN 108150318A CN 201711279449 A CN201711279449 A CN 201711279449A CN 108150318 A CN108150318 A CN 108150318A
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- China
- Prior art keywords
- pipeline
- egr
- water
- engine
- egr line
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- 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.)
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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
- F02M26/13—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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/33—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage controlling the temperature of the recirculated gases
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
The present invention provides a kind of engine EGR gas recirculation system and its control methods, the EGR exhaust recirculating system includes engine, air inlet pipeline, gas exhaust piping and the EGR line equipped with EGR valve, EGR line is arranged between the gas exhaust piping and the air inlet pipeline, further include the water injector being connect with the EGR line, water injector includes water tank, water pump and the liquid feeding pipeline being connect with the EGR line, liquid feeding pipeline includes the first pipeline and the second pipeline, water tank is connected by one end of the first pipeline and water pump, the other end of water pump is connect by the second pipeline with EGR line, the junction of second pipeline and EGR line is equipped with injection equipment, second pipeline is equipped with flowmeter close to one end of water pump, water pump and injection equipment are electrically connected with the controller of engine.The present invention avoids cooler for recycled exhaust gas carbon distribution or the corrosion engine performance brought and the deterioration discharged by increasing a set of water injector, and control the water spray being injected in EGR line in EGR line.
Description
Technical field
The present invention relates to vehicle motor EGR Technology field, more particularly to a kind of engine EGR exhaust gas again
The circulatory system and its control method.
Background technology
As emission regulation is more and more stringenter to engine emission requirements, to engine the consistency of each system parts with
And the deterioration in life cycle requires also more strictly.Cooler for recycled exhaust gas easily generates dirt in use makes cooling efficiency
Decline, lead to air outlet temperature variation so as to influence performance and the discharge of engine.
With the increase of usage time, cooler for recycled exhaust gas, which will appear carbon distribution, causes cooling efficiency to decline, and temperature becomes after EGR is cold
Change and lead to engine performance and deterioration of emission.In addition, cooler for recycled exhaust gas outlet will appear condensate corrosion during low temperature, lead to performance
Deterioration and engine abnormity.
Invention content
The purpose of the present invention is at least solving one of drawbacks described above and deficiency, which is to be achieved through the following technical solutions
's.
The present invention provides a kind of engine EGR gas recirculation system, including engine, air inlet pipeline, gas exhaust piping
And the EGR line equipped with EGR valve, the EGR line is arranged between the gas exhaust piping and the air inlet pipeline, for reality
Existing exhaust gas is from the exhaust side of engine to the adjustable recirculation of air inlet side, which is characterized in that further includes and connects with the EGR line
The water injector connect, the water injector include water tank, water pump and the liquid feeding pipeline being connect with the EGR line, the confession
Liquid pipeline includes the first pipeline and the second pipeline, and the water tank is connect by first pipeline with one end of the water pump, institute
The other end for stating water pump is connect by second pipeline with the EGR line, the company of second pipeline and the EGR line
It meets place and is equipped with injection equipment, second pipeline is equipped with flowmeter, the water pump and the spray close to one end of the water pump
Mechanism is penetrated to be electrically connected with the controller of engine.
Further, the injection equipment is nozzle.
It is given up the present invention also provides a kind of according to above-mentioned engine EGR gas recirculation system come the engine EGR implemented
The control method of gas recirculating system, including：
Needed for the optimal EGR exhaust temperature computation of S1, controller according to needed for each operating mode of engine is injected in EGR line
Water spray.
After S2, water pump pressurization, controller controls the aperture of nozzle according to flowmeter, and then controls and be injected in EGR line
Water spray.
Further, S1 steps include：
Heat dissipation needed for exhaust gas when being cooled to target temperature using the exhaust gas flow under current state and the calculating of exhaust gas specific heat of combustion
Amount；
It is calculated according to the specific heat of water under heat dissipation capacity, current state needed for the exhaust gas and latent heat of vaporization value and obtains the EGR
Water spray needed for pipeline；
MAP is corrected using water spray, and acquisition water spray setting value is modified to the water spray.
Advantages of the present invention is as follows：
The present invention increases a set of water injector in EGR line, cancels cooler for recycled exhaust gas, and according to needed for each operating mode of engine
Optimal EGR exhaust temperature control is injected to the water spray in EGR line, ensures temperature consistency, avoids cooler for recycled exhaust gas carbon distribution
Or corrode the deterioration of the engine performance brought and discharge.
Description of the drawings
By reading the detailed description of hereafter preferred embodiment, it is various other the advantages of and benefit it is common for this field
Technical staff will become clear.Attached drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.
Fig. 1 is the schematic diagram of engine EGR gas recirculation system provided in an embodiment of the present invention；
Fig. 2 is the control method flow chart of engine EGR gas recirculation system provided in an embodiment of the present invention；
Fig. 3 is the water spray control logic figure of engine EGR gas recirculation system provided in an embodiment of the present invention.
Reference numeral is as follows in figure：
100- engine body 200- turbines
101- air inlet pipeline 102- gas exhaust pipings
103-EGR pipeline 104-EGR valves
300- air induction system 301- air filters
302- compressor 303- charge air coolers
400- engine aftertreatment system 401-DOC oxidation catalyzers
402-DPF particulate filter 403-SCR catalytic converters
404- mufflers
1- water tank 2- water pumps
31- the first pipeline the second pipelines of 32-
4- nozzle 5- flowmeters
Specific embodiment
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although this public affairs is shown in attached drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here
The mode of applying is limited.It is to be able to be best understood from the disclosure, and can be by this public affairs on the contrary, providing these embodiments
The range opened completely is communicated to those skilled in the art.
Fig. 1 shows the structural representation of engine EGR gas recirculation system provided according to the embodiment of the present invention
Figure.As shown in Figure 1, the entire engine system of vehicle include engine body 100, turbine 200, air induction system 300,
Engine aftertreatment system 400 and gas recirculation system, air induction system 300 are included through engine body 100
101 air filter 301 connected in sequence of air inlet pipeline, compressor 302 and charge air cooler 303, engine aftertreatment system 400 include logical
102 DOC oxidation catalyzers 401 connected in sequence of gas exhaust piping, DPF particulate filters 402, the SCR for crossing engine body 100 are urged
Change converter 403 and muffler 404.
The gas recirculation system of the present invention substitutes traditional cooler for recycled exhaust gas with water injector, including engine 100, into
Air pipe 101, gas exhaust piping 102, the EGR line 103 equipped with EGR valve 104 and the water spray dress being connected with EGR line 103
It puts, EGR line 103 is arranged between gas exhaust piping 102 and air inlet pipeline 101, and the portion in gas exhaust piping 102 passes through
EGR line 103 is introduced into air pipe 101, realizes exhaust gas from the exhaust side of engine to the adjustable recirculation of air inlet side.
The water injector includes water tank 1, water pump 2 and the liquid feeding pipeline being connect with EGR line 103, liquid feeding pipeline and includes
First pipeline 31 and the second pipeline 32, water tank 1 are connect by the first pipeline 31 with one end of water pump 2, and the other end of water pump 2 passes through
Second pipeline 32 is connect with EGR line 103, and the junction of the second pipeline 32 and EGR line 103 is equipped with nozzle 4, and the second pipe
Road 32 is equipped with flowmeter 5 close to one end of water pump 2, and water pump 2 and nozzle 4 are electrically connected with the controller ECU of engine.
The present invention also provides a kind of control method of the water injector of engine EGR gas recirculation system, engines
Optimal EGR exhaust temperature of the controller ECU according to needed for each operating mode of engine, calculate heat dissipation capacity needed for exhaust gas, and root in real time
According to water spray (step S1) needed for the state computation of current water, after the pressurization of water pump 2, the aperture of nozzle 4 is adjusted by flowmeter 5
Water suitable in water tank 1 is sprayed into EGR line 103 (step S2) by nozzle 4, water at high temperature with exhaust gas heat exchange inhale by atomization and vaporization
Heat is taken to reduce the temperature of EGR gas.
Fig. 3 shows the specific control of the water spray of engine EGR gas recirculation system provided in an embodiment of the present invention
Logic chart.As shown in figure 3, first, the target according to needed for the optimal performance of engine and discharge state calibration EGR cools down temperature
Degree, and make the difference the cooling temperature drop needed for obtaining with temperature value before engine whirlpool；Secondly, using the exhaust gas flow under current state and
Heat dissipation capacity needed for exhaust gas when the calculating of exhaust gas specific heat of combustion is cooled to target temperature；Later, according to law of conservation of energy, exhaust gas heat dissipation capacity
It is all absorbed by cooling water, you can the institute of EGR line 103 is calculated according to the specific heat of water under current state and latent heat of vaporization value
Water spray is needed, is corrected after MAP is corrected through water spray with reference to current maximum water spray limit value and water spray setting value is calculated；Most
Afterwards, required duty ratio is determined according to the nozzle characteristic relation curve of water spray and duty ratio, controls the aperture of nozzle.
In specific implementation, temperature value is calculated by sensor measurement or model before whirlpool；Exhaust gas flow can be directly by giving up
Gas venturi measures or subtracts new charge by air inlet total amount and measures out；Exhaust gas specific heat, water specific heat and latent heat of vaporization value according to
Substance thermodynamic behaviour under different conditions obtains.
Present invention EGR exhaust temperature control optimal according to needed for each operating mode of engine is injected to the water spray in EGR line
Amount ensures temperature consistency, avoids cooler for recycled exhaust gas carbon distribution or the corrosion engine performance brought and the deterioration discharged.
It should be pointed out that in the description of the present invention, term " first ", " second " are only used for an entity or behaviour
Make with another entity or operate distinguish, without necessarily requiring or implying between these entities or operation there are it is any this
Kind practical relationship or sequence.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim
Subject to enclosing.
Claims (4)
1. a kind of engine EGR gas recirculation system, including engine, air inlet pipeline, gas exhaust piping and equipped with EGR valve
EGR line, the EGR line are arranged between the gas exhaust piping and the air inlet pipeline, are used to implement exhaust gas from engine
Exhaust side to air inlet side adjustable recirculation, which is characterized in that further include the water injector being connect with the EGR line,
The water injector includes water tank, water pump and the liquid feeding pipeline being connect with the EGR line, and the liquid feeding pipeline includes first
Pipeline and the second pipeline, the water tank are connect by first pipeline with one end of the water pump, the other end of the water pump
It is connect by second pipeline with the EGR line, the junction of second pipeline and the EGR line is equipped with spraying machine
Structure, second pipeline are equipped with flowmeter close to one end of the water pump, and the water pump and the injection equipment are with starting
The controller electrical connection of machine.
2. engine EGR gas recirculation system according to claim 1, which is characterized in that the injection equipment is spray
Mouth.
3. a kind of control method of engine EGR gas recirculation system, the control method is according to claims 1 or 2 institute
The engine EGR gas recirculation system stated is implemented, which is characterized in that including：
The optimal EGR exhaust temperature computation of S1, controller according to needed for each operating mode of engine is injected to spray required in EGR line
Water.
After S2, water pump pressurization, controller controls the aperture of nozzle according to flowmeter, and then controls the spray being injected in EGR line
Water.
4. the control method of engine EGR gas recirculation system according to claim 3, which is characterized in that S1 steps
Including：
Heat dissipation capacity needed for exhaust gas when being cooled to target temperature using the exhaust gas flow under current state and the calculating of exhaust gas specific heat of combustion；
It is calculated according to the specific heat of water under heat dissipation capacity, current state needed for the exhaust gas and latent heat of vaporization value and obtains the EGR line
Required water spray；
MAP is corrected using water spray, and acquisition water spray setting value is modified to the water spray.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711279449.6A CN108150318A (en) | 2017-12-06 | 2017-12-06 | Engine EGR gas recirculation system and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711279449.6A CN108150318A (en) | 2017-12-06 | 2017-12-06 | Engine EGR gas recirculation system and its control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108150318A true CN108150318A (en) | 2018-06-12 |
Family
ID=62466560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711279449.6A Pending CN108150318A (en) | 2017-12-06 | 2017-12-06 | Engine EGR gas recirculation system and its control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109139306A (en) * | 2018-08-13 | 2019-01-04 | 北京汽车股份有限公司 | Engines exhaust gas recirculation spray cooling system and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5131229A (en) * | 1989-08-03 | 1992-07-21 | AVL Gesellschaft fur Verbrennungskraftmaschinen und Messtechnik m.b.H. Prof.Dr.Dr.h.c. Hans List | Internal-combustion engine with exhaust gas turbocharger |
| JPH1182182A (en) * | 1997-09-04 | 1999-03-26 | Nippon Soken Inc | Exhaust gas recirculation system |
| CN2385785Y (en) * | 1999-07-23 | 2000-07-05 | 内蒙古蒙西水泥有限公司 | Spray cooling humidification device |
| JP2012229655A (en) * | 2011-04-26 | 2012-11-22 | Toyota Motor Corp | Exhaust circulation device of internal combustion engine |
| CN104500281A (en) * | 2014-11-12 | 2015-04-08 | 中国重汽集团济南动力有限公司 | Internal combustion engine exhaust gas recirculation closed-loop control system and method |
| CN105051350A (en) * | 2013-01-17 | 2015-11-11 | 尼马尔·穆利 | Internally cooled internal combustion engine and method thereof |
-
2017
- 2017-12-06 CN CN201711279449.6A patent/CN108150318A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5131229A (en) * | 1989-08-03 | 1992-07-21 | AVL Gesellschaft fur Verbrennungskraftmaschinen und Messtechnik m.b.H. Prof.Dr.Dr.h.c. Hans List | Internal-combustion engine with exhaust gas turbocharger |
| JPH1182182A (en) * | 1997-09-04 | 1999-03-26 | Nippon Soken Inc | Exhaust gas recirculation system |
| CN2385785Y (en) * | 1999-07-23 | 2000-07-05 | 内蒙古蒙西水泥有限公司 | Spray cooling humidification device |
| JP2012229655A (en) * | 2011-04-26 | 2012-11-22 | Toyota Motor Corp | Exhaust circulation device of internal combustion engine |
| CN105051350A (en) * | 2013-01-17 | 2015-11-11 | 尼马尔·穆利 | Internally cooled internal combustion engine and method thereof |
| CN104500281A (en) * | 2014-11-12 | 2015-04-08 | 中国重汽集团济南动力有限公司 | Internal combustion engine exhaust gas recirculation closed-loop control system and method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109139306A (en) * | 2018-08-13 | 2019-01-04 | 北京汽车股份有限公司 | Engines exhaust gas recirculation spray cooling system and method |
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Application publication date: 20180612 |
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