CN106499538A - A kind of gasoline-like fuel direct-injection compression ignition hybrid power engine method for controlling combustion - Google Patents
A kind of gasoline-like fuel direct-injection compression ignition hybrid power engine method for controlling combustion Download PDFInfo
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- CN106499538A CN106499538A CN201610937027.2A CN201610937027A CN106499538A CN 106499538 A CN106499538 A CN 106499538A CN 201610937027 A CN201610937027 A CN 201610937027A CN 106499538 A CN106499538 A CN 106499538A
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
The present invention proposes a kind of gasoline-like fuel direct-injection compression ignition hybrid power engine method for controlling combustion, multi-injection strategy is adopted in 1300～4000r/min of engine speed, load for the 30～80% of maximum load region, concrete injection strategy is to spray using single or twice within 20 to 100 degree CA before compression top center, then adopts single injection event within 10 to 30 degree CA before compression top center.Fuel injection control method proposed by the present invention, for the hybrid vehicle of 1300～4000r/min of engine speed, using multi-injection strategy, it is possible to achieve the normal operation of all operating points of gasoline-like fuel direct-injection compression ignition hybrid power engine.
Description
Technical field
The invention belongs to engine combustion control field, and in particular to a kind of combustion of the direct-injection compression ignition of use gasoline-like fuel
Burn control method.
Background technology
Hybrid vehicle is due to equipping two sets of dynamical systems of engine and motor simultaneously, it is possible to reduce engine runs model
Enclose, it is ensured that engine is operated in the range of optimum operating condition, oil consumption can be reduced.At present main flow hybrid power engine is using lighting
Formula petrol engine, but limited by pinking, engine compression ratio is not high, directly affects the raising of the thermal efficiency.And gasoline direct pressure
Burn engine is a kind of internal combustion engine, due to adopting compression-ignition mode, can significantly improve the gasoline engine thermal efficiency, reaches even super
Cross diesel engine level.In addition engine can mate different octane gasoline-like fuel, due to gasoline-like fuel delay period compared with
Long, it is sufficiently mixed can oil gas, by controlling rate of heat release, NOx and soot emissions can be greatly decreased simultaneously[1-5].
There are some advantages using the compression-ignition mode of low ron fuel (RON is between 70 and 85):Engine is high as diesel engine
Effect, after-treatment system complexity reduce, while oil refining process can be simplified, the demand that alleviates between heavy oil and light oil is uneven
Weighing apparatus[6].
In gasoline direct compression-ignition engine, the high load capacity thermal efficiency is high at present, and its optimum oil consumption region is located exactly at hybrid power
Conditioned area commonly used by engine, is suitable for hybrid power system.Due to demand and traditional vehicle of the hybrid electric vehicle to engine
Difference, so if being used for hybrid power, the method for controlling combustion of gasoline direct compression-ignition engine should also be readjusted[7-12].
Bibliography
[1]Hanson,R.；Splitter,D.；Reitz,R.Operating a Heavy-Duty Direct-
Injection Compression-Ignition Engine with Gasoline for Low Emissions.SAE
2009-01-1442.
[2]Sellnau,M.；Sinnamon,J.；Hoyer,K.；Husted,H.Gasoline Direct Injection
Compression Ignition(GDCI)-Diesel-like Efficiency with Low CO2Emissions.SAE
2011-01-1386.
[3]Sellnau,M.；Sinnamon,J.；Hoyer,K.；Husted,H.Full-Time Gasoline
Direct-Injection Compression Ignition(GDCI)for High Efficiency and Low NOx
and PM.SAE 2012-01-0384.
[4]Sellnau,M.；Sinnamon,J.；Hoyer,K.；Kim,J.；Cavotta,M.；Husted,H.Part-
Load Operation of Gasoline Direct-Injection Compression Ignition(GDCI)
Engine.SAE 2013-01-0272.
[5]Chang,J.；Kalghatgi,G.；Amer,A.；Adomeit,P.；Rohs,H.；Heuser,B.Vehicle
Demonstration of Naphtha Fuel Achieving Both High Efficiency and Drivability
with EURO6Engine-Out NOx emission.SAE 2013-01-0267
[6]Chang,J.；Viollet,Y；Amer,A.；Kalghatgi,G.Fuel Economy Potential of
Partially Premixed Compression Ignition(PPCI)Combustion with Naphtha Fuel.SAE
2013-01-2701.
[7]Sellnau,M.；Foster,M.；Hoyer,K.；Moore,W.；Sinnamon,J.；Husted,
H.Development of a Gasoline Direct Injection Compression Ignition(GDCI)Engine
SAE 2014-01-1300.
[8]Viollet,Y；Chang,J.；Kalghatgi,G.Compression Ratio and Derived
Cetane Number Effects on Gasoline Compression Ignition Engine Running with
Naphtha Fuels.SAE 2014-01-1301.
[9]Tetsu Y.；Shouji A.；Koichi N.；Takashi K.；Isao T.Economy with
Superior Thermal Efficient Combustion(ESTEC).SAE 2014-01-1192.
[10]Akiyuki Y.；Masaki U.；Osamu W.；Naohiro I.Development of New
Gasoline Engine for ACCORD Plug-in Hybrid.SAE 2013-01-1738
[11]NobukiK.；Kiyoshi N.；Toshihiro K.；Takasuke S.；Mamoru T.Development
of New 1.8-Liter Engine for Hybrid Vehicles.SAE 2009-01-1061.
[12]Dipl.-Ing.Seibel.；Prof.Dr.-Ing.Stefan Pischinger.；Dipl.-
Ing.Paul von Dincklage.Optimized Layout of Gasoline Engines for Hybrid
Powertrains.SAE2008-28-0024.
Content of the invention
For the weak point that this area is present, it is an object of the invention to provide a kind of gasoline-like fuel direct-injection compression ignition is mixed
Close power engine method for controlling combustion, by the conventional condition range of hybrid power engine using reasonably spraying, enter
Gas strategy, enables gasoline direct compression-ignition engine normal work in the operating mode of hybrid power demand, takes into account power output, oil
Consumption, combustion noise etc. are required.
The technical scheme for realizing above-mentioned purpose of the present invention is：
A kind of gasoline-like fuel direct-injection compression ignition hybrid power engine method for controlling combustion, engine speed 1300～
4000r/min, load adopt multi-injection strategy for the 30～80% of maximum load region, and concrete injection strategy is in compression
Spray using single or twice within the degree CA of before upper dead canter 20 to 100, then adopt within -10 to 30 degree of CA before compression top center
Use single injection event.
Preferably, admission pressure is 0.1～0.25MPa, and excess air coefficient is 1～2.5.
When engine speed increases, the incorporation time of fuel and air shortens, and in order to obtain the suitable gaseous mixture of concentration, needs
Time for spraying to be adjusted, EGR rate, excess air coefficient etc..
Further, in 1300～2400r/min of engine speed regions, before compression top center 20 to 100 degree CA it
Interior employing single sprays twice, then adopts single injection event after compression top center within -5 to 10 degree of CA.
In 1300～2400r/min of engine speed regions, the method for controlling combustion is 20 to 100 before compression top center
20～50% fuel is sprayed within degree CA, sprays into 50～80% fuel after compression top center within -5 to 10 degree of CA.
Wherein, EGR rate is controlled 0～40%.
In 2400～4000r/min of engine speed regions, before compression top center within 30 to 100 degree using single or
Spray twice, then before compression top center, single injection event is adopted within 0 to 30 degree.
In 2400～4000r/min of engine speed regions, the method for controlling combustion is 30 to 100 before compression top center
20～50% fuel is sprayed within degree CA, and remaining fuel is sprayed within 0 to 30 degree CA before compression top center.
Wherein, 0～50%, excess air coefficient is 1～2 for EGR rate control.
The beneficial effects of the present invention is：
1) fuel injection control method proposed by the present invention, for the hybrid power vapour of 1300～4000r/min of engine speed
Car, using multi-injection strategy, it is possible to achieve all operating points of gasoline-like fuel direct-injection compression ignition hybrid power engine normal
Operation.
2) using the control method of the present invention, it is adaptable to low octane value gasoline, it is possible to achieve gasoline-like fuel direct-injection compression ignition
Efficient, the low emission of hybrid power engine.
Description of the drawings
Fig. 1 is gasoline-like fuel direct-injection compression ignition hybrid power engine operating condition schematic diagram.
Fig. 2 is 1 engine combustion in-cylinder pressure of embodiment and instantaneous exothermic heat rate test result.
Fig. 3 is 2 engine combustion in-cylinder pressure of embodiment and instantaneous exothermic heat rate test result.
In figure, curve 1 is in-cylinder pressure, and curve 2 is instantaneous exothermic heat rate.
Specific embodiment
Following examples are used for the present invention to be described, but are not limited to the scope of the present invention.
In embodiment, the instrument for measuring tail gas is the CEB2 type exhaust analyzers of Austrian AVL companies production.Electrocontrolled high-pressure
The control software of common rail system is purchased from easily-controllable automotive electronics Co., Ltd, and fuel injection system hardware is given birth to by Delphi company of the U.S.
Produce.
EGR rate is calculated for carbon dioxide process.
Embodiment 1
The gasoline that octane number is 74 is used as fuel, without anti-knock agent.Embodiment with engine parameter is：Cylinder cylinder
Footpath 83.1mm, stroke 92mm, length of connecting rod 145.8mm, compression ratio 16.7.
Electronic control system control operation.(1300～2400r/min of rotating speed, load are for most in II regions in figure I
The 30 of high load capacity～80%), using multi-injection strategy, concrete injection strategy be before compression top center 20 to 100 degree CA it
Interior employing single injection event, sprays into 40% fuel, realizes first stage heat release near, then in compression only
60% fuel is sprayed into, second stage heat release is realized using single injection event within -5 to 10 degree of CA after point.Injection pressure is
90MPa.EGR rate is 20%, and admission pressure is 0.15MPa, and excess air coefficient is 1.8.
III regions (2400～4000r/min of rotating speed, load for maximum load 30～80%) in FIG, using more
Secondary injection strategy, concrete injection strategy are before compression top center to adopt single injection event within 30 to 100 degree, spray into 50% combustion
Material；Then single injection event is adopted within 0 to 30 degree before compression top center, spray into 50% fuel.Injection pressure is 90MPa.
EGR rate is 30%, and admission pressure is 0.19MPa, and excess air coefficient is 1.7.
Through measuring and calculating, the thermal efficiency of cycle of engine up to 41.9%, NOx emission 195ppm, engine combustion in-cylinder pressure and
Instantaneous exothermic heat rate test result is shown in Fig. 2.In Fig. 2, curve 1 is in-cylinder pressure, and curve 2 is instantaneous exothermic heat rate.From curve 2,
Burn for typical two benches heat release, and Exotherm Time staggers twice, do not overlap.From curve 1, pressure curve has twice
Significantly uphill process, corresponds to exothermic process twice respectively.The smooth nothing of pressure curve is acutely shaken, and shows pinking.
Embodiment 2
The gasoline that octane number is 92 is used as fuel, without anti-knock agent.Embodiment with engine parameter is：Cylinder cylinder
Footpath 83.1mm, stroke 92mm, length of connecting rod 145.8mm, compression ratio 16.7.
Electronic control system control operation.It is maximum load in 1300～2400r/min of engine speed, load
30～80%, using multi-injection strategy, concrete injection strategy is before compression top center to adopt single within 20 to 100 degree CA
Injection, sprays into 20% fuel, then adopts single injection event within -5 to 10 degree of CA after compression top center, sprays into 80% combustion
Material, realizes single phase heat release.Injection pressure is 90MPa.EGR rate is 30%, and admission pressure is 0.15MPa, excess air coefficient
For 1.9.
Through measuring and calculating, the thermal efficiency of cycle of engine up to 43.7%, NOx emission 303ppm, engine combustion in-cylinder pressure and
Instantaneous exothermic heat rate figure such as Fig. 3.In Fig. 3, curve 1 is in-cylinder pressure, and curve 2 is instantaneous exothermic heat rate.From curve 2, due to this
The fuel octane number that embodiment is adopted is higher, and ignitability is poor, for the first time the fuel of injection not compression ignition, but second
After the completion of secondary injection, single phase heat release is carried out, rate of heat release is very fast.From curve 1, in-cylinder pressure has after compression top center
The process for once significantly rising, but the smooth non-jitter of pressure curve, show pinking.
Above embodiment is only that the preferred embodiment of the present invention is described, and not the scope of the present invention is entered
Row is limited, on the premise of without departing from design spirit of the present invention, technical side of this area ordinary skill technical staff to the present invention
Various modifications and improvement that case is made, all should fall in the protection domain of claims of the present invention determination.
Claims (8)
1. a kind of gasoline-like fuel direct-injection compression ignition hybrid power engine method for controlling combustion, it is characterised in that turn in engine
1300～4000r/min of speed, load adopt multi-injection strategy, concrete injection strategy for the 30～80% of maximum load region
It is to spray using single or twice within 20 to 100 degree CA before compression top center, then -10 to 30 degree before compression top center
Single injection event is adopted within CA.
2. gasoline-like fuel direct-injection compression ignition hybrid power engine method for controlling combustion according to claim 1, its feature
It is, admission pressure is 0.1～0.25MPa, and excess air coefficient is 1～2.5.
3. gasoline-like fuel direct-injection compression ignition hybrid power engine method for controlling combustion according to claim 1 and 2, its are special
Levy and be, in 1300～2400r/min of engine speed regions, before compression top center, single is adopted within 20 to 100 degree CA
Or spray twice, after compression top center, then within -5 to 10 degree of CA, adopt single injection event.
4. gasoline-like fuel direct-injection compression ignition hybrid power engine method for controlling combustion according to claim 3, its feature
Be, 20～50% fuel, -5 to 10 degree of CA after compression top center within 20 to 100 degree CA, is sprayed into before compression top center
Within spray into 50～80% fuel.
5. gasoline-like fuel direct-injection compression ignition hybrid power engine method for controlling combustion according to claim 3, its feature
It is, EGR rate is controlled 0～40%.
6. gasoline-like fuel direct-injection compression ignition hybrid power engine method for controlling combustion according to claim 1 and 2, its are special
Levy and be, in 2400～4000r/min of engine speed regions, before compression top center within 30 to 100 degree using single or
Spray twice, then before compression top center, single injection event is adopted within 0 to 30 degree.
7. gasoline-like fuel direct-injection compression ignition hybrid power engine method for controlling combustion according to claim 6, its feature
It is, 0～50%, excess air coefficient is 1～2 for EGR rate control.
8. gasoline-like fuel direct-injection compression ignition hybrid power engine method for controlling combustion according to claim 6, its feature
It is, spray into 20～50% fuel before compression top center within 30 to 100 degree CA, remaining fuel is before compression top center
Spray within 0 to 30 degree CA.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11794566B2 (en) | 2019-01-16 | 2023-10-24 | Saudi Arabian Oil Company | System and method for employing gasoline compression ignition in a hybrid electric vehicle |
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2016
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| CN101324201A (en) * | 2007-06-15 | 2008-12-17 | 奇瑞汽车股份有限公司 | Method of secondary fuel injection homogeneous charging compressing ignition |
| CN101082309A (en) * | 2007-07-06 | 2007-12-05 | 清华大学 | Full behavior air/fuel ratio control method of double mode directly jetting gasoline engine |
| CN103590889A (en) * | 2013-10-30 | 2014-02-19 | 清华大学 | Combustion system and combustion method for two-stage pre-mixing compression ignition of gasoline direct injection engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US11794566B2 (en) | 2019-01-16 | 2023-10-24 | Saudi Arabian Oil Company | System and method for employing gasoline compression ignition in a hybrid electric vehicle |
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