CN105545530B - A kind of combustion gas and EGR mixing direct-injection systems - Google Patents
A kind of combustion gas and EGR mixing direct-injection systems Download PDFInfo
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- CN105545530B CN105545530B CN201610081620.1A CN201610081620A CN105545530B CN 105545530 B CN105545530 B CN 105545530B CN 201610081620 A CN201610081620 A CN 201610081620A CN 105545530 B CN105545530 B CN 105545530B
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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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
-
- 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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
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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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
A kind of combustion gas and EGR mixing direct-injection systems, wherein low pressure EGR tube connection exhaust pipe and high pressure EGR tube, low pressure EGR valve is installed on low pressure EGR tube, high pressure EGR valve is installed on high pressure EGR tube, EGR pump inlets are connected by high pressure EGR tube with exhaust main, EGR pump discharges pump out tracheae by EGR and are connected with the import of mixer one end, and the outlet of liquefaction gas bottle passes through gas pump air inlet pipe）It is connected with combustion gas pump inlet, combustion gas pump discharge is connected by gas pump escape pipe with mixer other end import, mixer outlet is connected by gaseous mixture rail connecting tube with gaseous mixture rail import, the outlet of gaseous mixture rail is connected by gaseous mixture supply pipe with mixture gas nozzle, and mixture gas nozzle is mounted in the air intake duct on cylinder or close to cylinder.
Description
Technical field
The present invention relates to a kind of direct-injection system, more specifically to a kind of combustion gas and EGR mixing direct-injection systems belong to combustion
The exhaust gas recirculatioon in mechanism of qi field（EGR）And gas supply system technical field.
Background technology
Currently, in face of increasingly severe environmental crisis, requirement of the various countries to emission regulation is increasingly stringenter, therefore the row of reduction
Put the Main way as internal combustion engine development.It is gradually taken seriously by the clean fuel of representative of natural gas, numerous studies show
More traditional petrol and diesel oil machine is discharged using the gas engine of clean fuel to be greatly reduced；The clean fuels such as natural gas are replaced as one kind simultaneously
Replacing fuel can alleviate demand of the China to oil to a certain degree.On the other hand, egr system is as reduction internal combustion engine NOxDischarge
Effective emission controls by improving combustion measure and low emission gas engine one of important technology route.Traditional egr system, by arranging
EGR circuit is established between tracheae and air inlet pipe, introduce exhaust gas into gas handling system and is mixed with fresh charge, then with fresh charge
Burning is participated in into cylinder, realizes the control to fire emission.Traditional egr system simple possible still exists
Following problem：On the one hand, there are operating lag effects for egr system, are likely to occur in acceleration or loading procedure excessive
EGR rates cause emission to steeply rise, are incomplete combustion, unstable or even catch fire；On the other hand, when EGR rates are larger,
Largely exhaust is introduced into air inlet pipe, and exhaust and the mixed effect of fresh charge are deteriorated, and cause EGR mixing and each cylinder EGR distribution
Unevenness, keeps part cylinder concentration of emission excessively high and combustion instability, and discharge and performance to engine have an adverse effect.
Chinese Patent Application No. be 201120382503.1, it is entitled《A kind of exhaust gas recirculation structure of diesel engine》
Utility model patent describe a kind of EGR structures of diesel engine, by increasing between EGR valve and inlet manifold
EGR distribution pipes make the EGR rate of each cylinder be easier to reach uniform.Chinese Patent Application No. is CN201210080055.9, entitled
《A kind of solution EGR drives the method and system of stagnant ring》Patent of invention describe a kind of solution EGR drive stagnant ring method and
System, the contact between variation tendency and EGR characteristic curves by establishing the actually required aperture of EGR are eliminated due to becoming
EGR drives hysteresis caused by change trend is inconsistent.But above-mentioned patent is the improvement to convention EGR systems, it cannot
The problems such as fundamentally solution EGR delays and EGR amount accurately control；Therefore, still none of these methods can be well at present
Under solution transient condition the problems such as the operating lag of EGR, accurately controlling for EGR systems is still internal combustion engine under transient condition
One, field urgent need to solve the problem.
Invention content
It is an object of the invention to be directed to the delay of existing egr system, the problems such as EGR amount accurately controls, a kind of combustion is provided
Gas and EGR mixing direct-injection systems.
To achieve the above object, technical solution of the invention is：A kind of combustion gas and EGR mixing direct-injection systems, including
Compressor, turbine, air intake intercooler, engine, cylinder, low pressure EGR tube, the compressor air inlet machine mouth are connected with air inlet pipe
It connects, compressor gas outlet is connected by compressor escape pipe with air intake intercooler import, and air intake intercooler outlet is logical
It crosses inlet manifold with engine to be connected, the turbine inlet is connected by exhaust main with engine, and turbine goes out
Mouthful be connected with exhaust pipe, be connected by connecting shaft between the compressor and turbine, further include have high pressure EGR tube,
EGR pumps, gaseous mixture rail, mixture gas nozzle, change fuel gas bottle and air pump at mixer, and the low pressure EGR tube connects exhaust pipe and height
EGR pipe is pressed, low pressure EGR valve is installed on low pressure EGR tube, high pressure EGR valve, the EGR pump inlets are installed on high pressure EGR tube
It is connected with exhaust main by high pressure EGR tube, EGR pump discharges pump out tracheae by EGR and are connected with the import of mixer one end,
The liquefaction gas bottle outlet is connected by gas pump air inlet pipe with combustion gas pump inlet, and the combustion gas pump discharge passes through combustion
Air pump escape pipe is connected with mixer other end import, and the mixer outlet passes through gaseous mixture rail connecting tube and gaseous mixture
Rail import is connected, and gaseous mixture rail outlet is connected by gaseous mixture supply pipe with mixture gas nozzle, the mixing
Gas jets are mounted in the air intake duct on cylinder or close to cylinder.
Further include having EGR filters, the EGR filter inlets are connected with high pressure EGR tube, EGR filter outlets
Air inlet pipe is pumped by EGR with EGR pump inlets to be connected.
Further include having gaseous mixture charge air cooler, the gaseous mixture charge air cooler is arranged in gaseous mixture rail connecting tube, gaseous mixture
Intercooler inlet is connected with mixer outlet, and gaseous mixture intercooler outlet is connected with gaseous mixture rail import.
Further include having gas filter, the gas filter is arranged between liquefaction gas bottle and gas pump, combustion gas
Filter inlet is connected by the outlet of gas header pipe and liquefaction gas bottle, gas filter outlet by gas pump air inlet pipe with
Combustion gas pump inlet is connected, and gas pressure-reducing valve is provided on the gas header pipe.
Compared with prior art, the beneficial effects of the invention are as follows：
1, EGR pump inlets are connected by high pressure EGR tube with exhaust main in the present invention, and EGR pump discharges are pumped out by EGR
Tracheae is connected with the import of mixer one end；The outlet of liquefaction gas bottle is connected by gas pump air inlet pipe with combustion gas pump inlet,
Combustion gas pump discharge is connected by gas pump escape pipe with mixer other end import；Mixer outlet is connected by gaseous mixture rail
Pipe is connected with gaseous mixture rail import, and the outlet of gaseous mixture rail is connected by gaseous mixture supply pipe with mixture gas nozzle, gaseous mixture
Nozzle is mounted on cylinder.By the way that the mixer of combustion gas and EGR is arranged, combustion gas and EGR after pressurization are mixing by a certain percentage
It is mixed in device；By the gaseous mixture rail of combustion gas and EGR, pressure in gaseous mixture rail is maintained using gas pump and EGR pumps；And it is mixed
It closes gas jets with gaseous mixture rail to be connected, certain proportion combustion gas and EGR is injected directly by combustion gas and EGR mixture gas nozzles and started
In machine cylinder, so that accurately being sprayed into certain proportion combustion gas and EGR gaseous mixtures in cylinder by controlling mixture gas nozzle, realize
Combustion gas and the quick of EGR are accurately controlled, EGR operating lags are effectively prevented, eliminates the sound of conventional gas supply and egr system
The problems such as uneven with each cylinder branch should be lagged.
2, combustion gas and EGR share a gaseous mixture supply pipe in the present invention, are sprayed into cylinder to real through mixture gas nozzle
Existing combustion gas and EGR mix direct-injection.Combustion gas and EGR share mixture gas nozzle, reduce mixture gas nozzle quantity, solve in cylinder
Mixture gas nozzle Layout Problem；Gaseous mixture supply pipe is shared, reduces gas rail quantity, simplifies spraying system；Low temperature combustion simultaneously
Gas and with high temperature EGR it is in-orbit before directly mix, solve the cooling requirement of EGR, avoid the use of EGR heat exchangers.
3, two kinds of EGR circuits of high pressure and low pressure are established in the present invention, by controlling high pressure EGR valve and low pressure EGR valve control
EGR pumpings gas mode processed realizes and flexibly takes gas strategy.
Description of the drawings
Fig. 1 is schematic structural view of the invention.
In figure, air inlet pipe 1, compressor 2, connecting shaft 3, turbine 4, compressor escape pipe 5, air intake intercooler 6, air inlet is total
Pipe 7, engine 8, cylinder 9, exhaust main 10, exhaust pipe 11, low pressure EGR tube 12, low pressure EGR valve 13, high pressure EGR valve 14 are high
EGR pipe 15, EGR charge air coolers 16, EGR is pressed to pump air inlet pipe 17, EGR pumps 18, EGR and pumps out tracheae 19, mixer 20, cold in gaseous mixture
Device 21, gaseous mixture rail connecting tube 22, gaseous mixture rail 23, gaseous mixture supply pipe 24, mixture gas nozzle 25, liquefaction gas bottle 26, combustion
Gas manifold 27, gas pressure-reducing valve 28, gas filter 29, gas pump air inlet pipe 30, gas pump 31, gas pump escape pipe 32.
Specific implementation mode
Below in conjunction with description of the drawings, the present invention is described in further detail with specific implementation mode.
Referring to Fig. 1, a kind of combustion gas and EGR mixing direct-injection systems, including compressor 2, turbine 4, air intake intercooler 6, hair
Motivation 8, cylinder 9, low pressure EGR tube 12, high pressure EGR tube 15, EGR pump 18, mixer 20, gaseous mixture rail 23, mixture gas nozzle 25,
Change fuel gas bottle 26 and air pump 31.2 air inlet of compressor is connected with air inlet pipe 1, and 2 gas outlet of compressor passes through compressor
Escape pipe 5 is connected with 6 import of air intake intercooler；The outlet of air intake intercooler 6 passes through inlet manifold 7 and 8 phase of engine
Connection.4 import of turbine is connected by exhaust main 10 with engine 8, and the outlet of turbine 4 is connected with exhaust pipe 11
It connects；It is connected by connecting shaft 3 between the compressor 2 and turbine 4.The low pressure EGR tube 12 connects exhaust pipe 11
With high pressure EGR tube 15, low pressure EGR valve 13 is installed on low pressure EGR tube 12；High pressure EGR valve 14 is installed on high pressure EGR tube 15.
The EGR pumps 18 imports and is connected with exhaust main 10 by high pressure EGR tube 15, and 18 outlet of EGR pumps pumps out tracheae by EGR
19 are connected with 20 one end import of mixer.The outlet of liquefaction gas bottle 26 passes through gas pump air inlet pipe 30 and gas pump 31
Import is connected, and the gas pump 31 outlet is connected by gas pump escape pipe 32 with 20 other end import of mixer.Institute
The outlet of mixer 20 stated is connected by gaseous mixture rail connecting tube 22 with 23 import of gaseous mixture rail, the gaseous mixture rail 23）
Outlet is connected by gaseous mixture supply pipe 24 with mixture gas nozzle 25；The mixture gas nozzle 25 be mounted on cylinder 9 on or
In the air intake duct of cylinder 9；Mixture gas nozzle 25 is arranged close to realize air intake duct direct-injection in the air intake duct of cylinder 9, it can
Obtain preferable response characteristic.
Further include having EGR filters 16 further referring to Fig. 1,16 import of EGR filters and high pressure EGR tube
15 are connected, and the outlet of EGR filters 16 pumps air inlet pipe 17 by EGR and is connected with EGR 18 imports of pump.
Further include having gaseous mixture charge air cooler 21 further referring to Fig. 1, the gaseous mixture charge air cooler 21 setting is mixed
It closes in gas rail connecting tube 22, i.e., gaseous mixture charge air cooler 21 is arranged between mixer 20 and gaseous mixture rail 23；Gaseous mixture charge air cooler
21 imports are connected with outlet, and the outlet of gaseous mixture charge air cooler 21 is connected with 23 import of gaseous mixture rail.
Further include having gas filter 29 further referring to Fig. 1, the gas filter 29 setting is fired in liquefaction
Between gas cylinder 26 and gas pump 31.29 import of gas filter is connected by gas header pipe 27 with the outlet of liquefaction gas bottle 26,
The outlet of gas filter 29 is connected by gas pump air inlet pipe 30 with 31 import of gas pump；It is arranged on the gas header pipe 27
There is gas pressure-reducing valve 28.
Referring to Fig. 1, the present invention establishes combustion gas and EGR mixing common rail direct injection systems, and 9 inner direct of cylinder may be implemented
Exhaust gas and combustion gas are suitable for multi-cylinder pressurized combustion gases machine.When work, combustion gas and exhaust gas are added by gas pump 31 and EGR pumps 18 respectively
It is pressed into and is mixed into mixer 20, mixer 20 controls combustion gas and EGR mixed proportions, ensures in cylinder to combustion gas and EGR amount
Demand；Combustion gas enters gaseous mixture rail 23 with EGR after mixer 20 mixes, and maintains certain pressure in gaseous mixture rail 23；It is mixed
It closes gas jets 25 with gaseous mixture rail 23 to be connected, the opening and closing by controlling mixture gas nozzle 25 control gaseous mixture and enter cylinder
Moment and emitted dose in 9.Therefore, the present invention is according to demand of the burning to combustion gas and EGR amount in cylinder 9, by mixing gas blowout
Mouth 25 accurately controls combustion gas and EGR sprays into air-fuel mixture amount and gaseous mixture in cylinder and enters the moment in cylinder 9, by the combustion gas of required ratio
It is accurately quickly sprayed into cylinder 9 with EGR and participates in fire emission control, realized and combustion gas and the quick of EGR are accurately controlled, keep away
The EGR that combustion gas and EGR distribute the problems such as uneven, eliminate existing egr system between each cylinder caused by air inlet mixing is uneven is exempted from
Response lag problem solves the problems such as operating lag of EGR under transient condition, realizes EGR systems under transient condition
Accurately control, ensure that engine 8 has preferably performance and emission effect.
Referring to Fig. 1, combustion gas and EGR share a gaseous mixture supply pipe 24 in the present invention, and gaseous mixture is through mixture gas nozzle 25
It sprays into cylinder 9 to realize that combustion gas and EGR mix direct-injection.Combustion gas and EGR share mixture gas nozzle 25, reduce mixing gas blowout
25 quantity of mouth solves 25 Layout Problem of mixture gas nozzle in cylinder 9；Gaseous mixture supply pipe is shared, gas rail quantity is reduced, letter
Spraying system is changed；Simultaneously low temperature combustion gas and with high temperature EGR it is in-orbit before directly mix, solve the cooling requirement of EGR, avoid
The use of EGR heat exchangers.
Referring to Fig. 1, meanwhile, mesohigh EGR pipe 15 of the present invention and low pressure EGR tube 12 are connected with EGR pumps 18, high pressure EGR valve
14 and low pressure EGR valve 13 be separately mounted on high pressure EGR tube 15 and low pressure EGR tube 12；Establish two kinds of EGR of high pressure and low pressure
Circuit, the opening and closing by controlling high pressure EGR valve 14 and low pressure EGR valve 13 control EGR pumping gas modes, and realization flexibly takes
Gas strategy.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
The specific implementation of the present invention is confined to these explanations.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, and above structure all shall be regarded as belonging to
Protection scope of the present invention.
Claims (4)
1. a kind of combustion gas and EGR mixing direct-injection systems, including compressor（2）, turbine（4）, air intake intercooler（6）, engine
（8）, cylinder（9）, low pressure EGR tube（12）, the compressor（2）Air inlet and air inlet pipe（1）It is connected, compressor（2）Go out
Gas port passes through compressor escape pipe（5）With air intake intercooler（6）Import is connected, the air intake intercooler（6）Outlet passes through
Inlet manifold（7）With engine（8）It is connected, the turbine（4）Import passes through exhaust main（10）With engine（8）Phase
Connection, turbine（4）Outlet and exhaust pipe（11）It is connected, the compressor（2）With turbine（4）Between pass through connecting shaft
（3）It is connected, it is characterised in that：Further include having high pressure EGR tube（15）, EGR pump（18）, mixer（20）, gaseous mixture rail（23）、
Mixture gas nozzle（25）, liquefaction gas bottle（26）And air pump（31）, the low pressure EGR tube（12）Connect exhaust pipe（11）And height
Press EGR pipe（15）, low pressure EGR tube（12）On low pressure EGR valve is installed（13）, high pressure EGR tube（15）On high pressure EGR valve is installed
（14）, the described EGR pumps（18）Import passes through high pressure EGR tube（15）With exhaust main（10）It is connected, EGR pumps（18）Outlet is logical
It crosses EGR and pumps out tracheae（19）With mixer（20）One end import is connected, the liquefaction gas bottle（26）Outlet passes through combustion gas
Pump air inlet pipe（30）With gas pump（31）Import is connected, the gas pump（31）Outlet passes through gas pump escape pipe（32）With
Mixer（20）Other end import is connected, the mixer（20）Outlet passes through gaseous mixture rail connecting tube（22）With gaseous mixture
Rail（23）Import is connected, the gaseous mixture rail（23）Outlet passes through gaseous mixture supply pipe（24）With mixture gas nozzle（25）Phase
Connection, the mixture gas nozzle（25）Mounted on cylinder（9）Upper or close cylinder（9）Air intake duct in.
2. a kind of combustion gas according to claim 1 and EGR mixing direct-injection systems, it is characterised in that：Further include having EGR filterings
Device（16）, the EGR filters（16）Import and high pressure EGR tube（15）It is connected, EGR filters（16）Outlet passes through EGR
Pump air inlet pipe（17）It is pumped with EGR（18）Import is connected.
3. a kind of combustion gas according to claim 1 and EGR mixing direct-injection systems, it is characterised in that：Further include having gaseous mixture
Charge air cooler（21）, the gaseous mixture charge air cooler（21）It is arranged in gaseous mixture rail connecting tube（22）On, gaseous mixture charge air cooler（21）
Import and mixer（20）Outlet is connected, gaseous mixture charge air cooler（21）Outlet and gaseous mixture rail（23）Import is connected.
4. a kind of combustion gas according to claim 1 and EGR mixing direct-injection systems, it is characterised in that：Further include having combustion gas
Filter（29）, the gas filter（29）It is arranged in liquefaction gas bottle（26）And gas pump（31）Between, gas filter
（29）Import passes through gas header pipe（27）With liquefaction gas bottle（26）Outlet is connected, gas filter（29）Outlet passes through combustion gas
Pump air inlet pipe（30）With gas pump（31）Import is connected, the gas header pipe（27）On be provided with gas pressure-reducing valve（28）.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610081620.1A CN105545530B (en) | 2016-02-05 | 2016-02-05 | A kind of combustion gas and EGR mixing direct-injection systems |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610081620.1A CN105545530B (en) | 2016-02-05 | 2016-02-05 | A kind of combustion gas and EGR mixing direct-injection systems |
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| CN105545530A CN105545530A (en) | 2016-05-04 |
| CN105545530B true CN105545530B (en) | 2018-09-25 |
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| CN112648070A (en) * | 2021-01-13 | 2021-04-13 | 广东西电动力科技股份有限公司 | Biogas generator set |
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|---|---|
| CN105545530A (en) | 2016-05-04 |
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