CN101324201B - Method of secondary fuel injection homogeneous charging compressing ignition - Google Patents
Method of secondary fuel injection homogeneous charging compressing ignition Download PDFInfo
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- CN101324201B CN101324201B CN2007100749509A CN200710074950A CN101324201B CN 101324201 B CN101324201 B CN 101324201B CN 2007100749509 A CN2007100749509 A CN 2007100749509A CN 200710074950 A CN200710074950 A CN 200710074950A CN 101324201 B CN101324201 B CN 101324201B
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- 238000002347 injection Methods 0.000 title claims abstract description 49
- 239000007924 injection Substances 0.000 title claims abstract description 49
- 239000000446 fuel Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000006835 compression Effects 0.000 claims abstract description 29
- 238000007906 compression Methods 0.000 claims abstract description 29
- 230000007246 mechanism Effects 0.000 claims abstract description 6
- 239000003921 oil Substances 0.000 claims description 39
- 239000000295 fuel oil Substances 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 abstract description 19
- 239000000203 mixture Substances 0.000 abstract description 7
- 238000007599 discharging Methods 0.000 abstract description 6
- 238000012360 testing method Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- OUUQCZGPVNCOIJ-UHFFFAOYSA-M Superoxide Chemical compound [O-][O] OUUQCZGPVNCOIJ-UHFFFAOYSA-M 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000010734 process oil Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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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
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- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention discloses a method for secondary oil injection homogeneous charging compression ignition, which comprises the following steps: an exhaust valve is closed in advance so as to capture large amount of inner EGR by adjusting a variable valve timing (VVT) mechanism; primary oil injection is carried out in the exhaust stroke and the intake stroke respectively; the primary oil injection is carried out in the exhaust stroke, fuel injection quantity accounts for 10 percent to 40 percent of single-cycle total fuel injection quantity, the oil injection time is minus 60 degrees to minus 30 degrees, and the fuel is modified, thus forming gas mixture which is easy for compression ignition; the secondary oil injection is carried out in the intake stroke, the fuel injection quantity accounts for 60 percent to 90 percent of single-cycle total oil injection quantity, the oil injection time is 80 degrees to 120 degrees, and homogeneous thin gas mixture can be formed when reaching near the compression top dead center; the excess air coefficient is 1.0 to 1.7; HCCl combustion can be realized under the condition that the compression ratio is 8 to 14 and the EGR rate is 30 percent to 70 percent; the tests show that the method can improve the stability of combustion and compared with the conventional electric control airway injection gasoline engine, the effective fuel consumption rate of the working condition below 3000r/min can save fuel by more than 20 percent; compared with the conventional airway injection gasoline engine, NO<X> discharging is reduced by 90 percent to 99 percent under the same load.
Description
Technical field
The present invention relates to a kind of combustion in IC engine technology, especially relate to a kind of controlling method of G. D. I engine secondary fuel injection homogeneous charging compressing ignition.
Background technique
Homogeneous charging compressing ignition (" Homogeneous Charge Compression Ignition ", abbreviation " HCCI ") is a kind of brand-new combustion in IC engine notion.Both be different from diesel engine (heterogeneous body charge compression ignition), be different from petrol engine (homogeneous charging spark ignition) again.It is the mixture of a kind of spark ignition engine and compressing ignition formula engine concept.It combines the characteristics of Spark ignition type combustion manner and compression-ignited combustion manner, both can realize being pre-mixed of fuel and air, can light with the compression ignite mode again.The HCCI burning has very little circulation deviation, and does not have the flame propagation process.Therefore, HCCI has fuel-economizing and low emission two big advantages, is a kind of very desirable combustion manner, can increase substantially the thermal efficiency of motor and reduce the discharging of harmful exhaust greatly, is representing following petrolic developing direction.Gasoline realizes that the HCCI combustion mode has two kinds of fuel supply modes: intake port injection (PFI) and in-cylinder direct injection (GDI).Adopt PFI, simple in structure, in cylinder, form the homogeneous inflammable mixture easily, be aided with control suitable intake temperature and equivalent proportion again, can realize the HCCI burning.Therefore, relatively be suitable for the research of HCCI combustion effects factor.But one of difficulty that the HCCI burning is maximum is the control of catching fire, and then fuel injection quantity control is accurate to adopt GDI, and the engine combustion performance response is fast, and injection control strategy is flexible, can realize multi-injection in cylinder, controls HCCI ignition timing and rate of burning easily.Antiknock gasoline will realize under the normal temperature inlet air conditions that the HCCI burning must improve the temperature of mixed gas in cylinder, can adopt methods such as EGR technology and raising compression ratio.So on the basis of GDI motor, adopt the two vvt mechanisms of high pressure co-rail system and import/exhaust,, can realize petrol engine homogeneous charge compressing ignition by adjusting vvt mechanism and oil spout strategy.Chinese patent CN200410091550.5 discloses a kind of method with the burning of secondary injection control G. D. I engine compression ignition, and it is that employing air inlet and twice oil spout of compression stroke and the method that increases substantially compression ratio realize homogeneous compression-ignition.The gasoline that compression stroke sprays into also can form the mixed gas that is easy to burn through overcompression, but because its oil spout is constantly very approaching apart from compression ignition constantly, and mixed gas can not fully mix, burning is with instability; Excess air coefficient also can only be controlled at 0.8～1.1, can not realize the lean combustion of real meaning.
The claimant solves by a large amount of engine rig tests, has found out rational secondary fuel injection homogeneous charging compressing ignition method.
Summary of the invention
The technical problem to be solved in the present invention is, in order to remedy the deficiency of existing secondary fuel injection homogeneous charging compressing ignition method, and provide a kind of it mixed gas can fully be mixed, flameholding; And the excess air coefficient height, and can realize the method for secondary fuel injection homogeneous charging compressing ignition of the lean combustion of real meaning.
The present invention solves the problems of the technologies described above to adopt following technological scheme: a kind of antiknock gasoline will be realized the HCCI burning under the normal temperature inlet air conditions, must utilize methods such as EGR technology and raising compression ratio to improve the temperature of mixed gas in cylinder.This method is by adjusting changing air valve phase (VVT) mechanism, close exhaust valve in advance, intercepting a large amount of internal EGRs.Respectively carry out an oil spout (during oil spout, exhaust valve cuts out in exhaust process, and fuel oil can be along with waste gas is discharged) in exhaust stroke and aspirating stroke then.
Concrete technological scheme is as follows:
The internal EGR technology combines with twice oil spout strategy, adopts exhaust stroke latter stage and twice fuel injecting method of aspirating stroke, regulates the oil spout ratio twice, can control the HCCI burning.
1) carry out the oil spout first time in exhaust stroke, (defining this oil spout is I
1) fuel injection quantity accounts for 10%～40% of single cycle total fuel injection quantity, oil spout is-60 °～-30 ° constantly, makes the fuel oil upgrading, forms the mixed gas that is easy to compression ignite;
2) carry out the oil spout second time in aspirating stroke, (defining this oil spout is I
2) fuel injection quantity is 60%～90% of single cycle total fuel injection quantity.Oil spout is 80 °～120 ° constantly, to forming the thin mixed gas of homogeneous near the compression top center.
Describedly carry out the oil spout second time, to forming the thin mixed gas of homogeneous near the compression top center, its excess air coefficient 1.0～1.7 in aspirating stroke; It is 30%～70% that EGR leads.
The method of described a kind of secondary fuel injection homogeneous charging compressing ignition, described compressing ignition, its compression ratio 8～14.
Good effect of the present invention is, owing to adopt the fuel oil that sprays into for the first time, in the atmosphere of high temperature EGR, atomize rapidly and evaporate, and by the partial oxidation upgrading, generate a large amount of active components (aldehyde, ether, superoxide etc.), cylinder temperature raises, fire behaviour is improved, and near the homogeneous charge to having formed the band active group compression top center produces spontaneous combustion.The fuel oil that sprays into for the second time than well evaporating mixing under the air blast effect, to forming the thin mixed gas of homogeneous near the compression top center, produces the HCCI burning in cylinder.By controlling twice fuel injection quantity, oil spout ratio and oil spout constantly, just can in cylinder, form stable HCCI ignition mode and discharging is controlled.
Simultaneously, utilize exhaust energy to make the inflammable mixture upgrading, and evenly mix fully, at compression ratio 8～14, excess air coefficient 1.0～1.7, EGR lead under 30%～70% the situation, can realize stable rarefied gas homogeneous compression-ignition.Can realize HCCI combustion mode in compression ratio 8～14 scopes by this oil spout strategy of the experiment confirm on model machine.
Further specify the present invention below in conjunction with embodiment and accompanying drawing.
Description of drawings
Fig. 1 is an in-cylinder direct injection combustion system organigram.
Fig. 2 is the constantly relative crank angle phase place schematic representation of twice oil spout.
Fig. 3 is the oil consumption figure in the four cylinder in-cylinder direct injection HCCI petrol engine ranges of operation.
Fig. 4 is the NOx discharging figure in the four cylinder in-cylinder direct injection HCCI petrol engine ranges of operation.
Among the figure: 1. firing chamber, 2. porous oil sprayer, 3. spark plug, 4. intake duct, 5. air outlet flue, 6. piston.
Embodiment
Embodiment as shown in Figure 1, a kind of petrol engine in-cylinder direct injection combustion system comprises firing chamber 1, porous oil sprayer 2, spark plug 3, intake duct 4, air outlet flue 5, piston 6 and the electronic control injection system that can carry out the multistage oil spout.Testing program is to be 83.5 millimeters at a cylinder diameter, stroke is 90 millimeters, compression ratio is on 10 the four cylinder in-cylinder direct injection petrol engines, adjust vvt mechanism, exhaust valve cuts out in advance, intercept a large amount of internal EGRs, (it is 30%～70% that EGR leads), during the intake/exhaust valve under lap (exhaust valve is closed to IO Intake Valve Opens in advance and is referred to as the under lap phase during this period of time), the waste gas of staying in the cylinder is compressed, and forms high-temperature internal EGR atmosphere in cylinder.The gasoline that for the first time spray into this moment is atomizing and evaporation rapidly, and by the partial oxidation upgrading, generates a large amount of active component (aldehyde, ether, superoxide etc.), cylinder temperature raises, the gasoline fire behaviour is improved, and near the homogeneous charge to having formed the band active group compression top center produces spontaneous combustion.Not only help to improve combustion stability, expand the HCCI limit, can also reduce HC and CO discharging.This time fuel injection quantity accounts for 10%～40% of single cycle total fuel injection quantity, and oil spout is-60 °～-30 ° constantly.The constantly relative crank angle phase place of oil spout as shown in Figure 2.Confirm by experiment under different EGR leads,, just can realize the HCCI burning of operating point by regulating oil spout ratio and fuel injection quantity and oil spout constantly.
The fuel oil second time that sprays in intake stroke than well evaporating mixing under the air blast effect, to forming the thin mixed gas of homogeneous near the compression top center, produces the HCCI burning in cylinder.Fuel injection quantity accounts for 60%～90% of single cycle total fuel injection quantity, and oil spout is 80 °～120 ° constantly.The constantly relative crank angle phase place of oil spout as shown in Figure 2.
Control twice fuel injection quantity, oil spout ratio and oil spout constantly, just can control temperature, CONCENTRATION DISTRIBUTION and the chemical component of mixed gas exactly, thereby realize control HCCI burning and discharge process.Along with I
1Increase, ignition timing shifts to an earlier date, and rate of burning is accelerated, and combustion duration shortens, and can control the ignition timing and the rate of burning of gasoline HCCI burning.By this twice oil spout strategy, can effectively control the HCCI burning.
Confirm I below by test
1+ I
2The oil spout strategy be applicable to control HCCI burning.
Fig. 3 shows the four oil consumption figures of cylinder HCCI petrol engine in the HCCI range of operation.HCCI multi-cylinder gasoline engine rig test result shows, in the HCCI range of operation, the effective specific fuel consumption of the following operating mode of 3000r/min is with respect to the fuel-economizing of the automatically controlled gas-duct jetting petrol engine of routine more than 20%.
Fig. 4 shows four NOs of cylinder HCCI petrol engine in the HCCI range of operation
xDischarging.As can be seen, in the HCCI of broadness operating conditions plane, NOX is emitted under the same load, reduces by 90%～99% with respect to conventional gas-duct jetting petrol engine.
Claims (3)
1. the method for a secondary fuel injection homogeneous charging compressing ignition is by adjustment changing air valve phase mechanism, closes exhaust valve in advance, and the EGR amount of intercepting 30%～70% is respectively carried out an oil spout in exhaust stroke and aspirating stroke then, and concrete steps are as follows:
1) carry out the oil spout first time in exhaust stroke, fuel injection quantity accounts for 10%～40% of single cycle total fuel injection quantity, and oil spout is-60 °～-30 ° constantly, makes the fuel oil upgrading, forms the mixed gas that is easy to compression ignite;
2) carry out the oil spout second time in aspirating stroke, fuel injection quantity is 60%～90% of a single cycle total fuel injection quantity, and oil spout is 80 °～120 ° constantly, to forming the thin mixed gas of homogeneous near the compression top center.
2. the method for a kind of secondary fuel injection homogeneous charging compressing ignition according to claim 1, it is characterized in that: describedly carry out the oil spout second time in aspirating stroke, to forming the thin mixed gas of homogeneous near the compression top center, its excess air coefficient 1.0～1.7.
3. the method for a kind of secondary fuel injection homogeneous charging compressing ignition according to claim 1 is characterized in that: described compressing ignition, its compression ratio 8～14.
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| CN2007100749509A CN101324201B (en) | 2007-06-15 | 2007-06-15 | Method of secondary fuel injection homogeneous charging compressing ignition |
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| CN2007100749509A CN101324201B (en) | 2007-06-15 | 2007-06-15 | Method of secondary fuel injection homogeneous charging compressing ignition |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101929364B (en) * | 2010-07-28 | 2012-05-23 | 清华大学 | Diffusion combustion method for knock-resisting compression ignition of equivalence-ratio gasoline direct injection engine |
| JP5753142B2 (en) | 2012-09-19 | 2015-07-22 | 本田技研工業株式会社 | Combustion control device for internal combustion engine and method for burning homogeneous lean mixture |
| CN106499538B (en) * | 2016-11-01 | 2019-09-20 | 清华大学 | A kind of gasoline-like fuel direct-injection compression ignition hybrid power engine method for controlling combustion |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005019626A1 (en) * | 2003-08-20 | 2005-03-03 | Scania Cv Ab (Publ) | Arrangement and method for controlling a combustion engine |
| CN1279271C (en) * | 2004-11-19 | 2006-10-11 | 清华大学 | Method of controlling charge compression Ignition of direct spray type gasoline engine homogeneous |
| CN1291146C (en) * | 2004-02-27 | 2006-12-20 | 清华大学 | Method of layering forming mixed gas for gasoline directly jetting type engine based multisection jetting |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005019626A1 (en) * | 2003-08-20 | 2005-03-03 | Scania Cv Ab (Publ) | Arrangement and method for controlling a combustion engine |
| CN1291146C (en) * | 2004-02-27 | 2006-12-20 | 清华大学 | Method of layering forming mixed gas for gasoline directly jetting type engine based multisection jetting |
| CN1279271C (en) * | 2004-11-19 | 2006-10-11 | 清华大学 | Method of controlling charge compression Ignition of direct spray type gasoline engine homogeneous |
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