CN104612869A - Method for restraining supercharge gasoline engine super detonation through double-fuel injection - Google Patents
Method for restraining supercharge gasoline engine super detonation through double-fuel injection Download PDFInfo
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Abstract
The invention relates to the technical field of internal combustion engines, in particular to a method for restraining the supercharge gasoline engine super detonation through double-fuel injection. According to the method for restraining the supercharge gasoline engine super detonation through double-fuel injection, gasoline is injected in an intake channel of an engine, alcohol fuel is injected in a combustion chamber one or more times, the alcohol fuel with high latent heat of vaporization is injected in intake stroke and can lower the intake temperature, the charging quantity coefficient is increased, and the dynamic property is improved; due to the compression stroke injection, the temperature of mixed gas at a compression terminal can be reduced, and premature combustion is effectively restrained; injection is conducted in the combustion process, fuel layered mixed gas can be formed, and the spreading route of detonation waves is cut off; the super detonation of a supercharge small-displacement gasoline engine can be effectively restrained through one or more times of injection, and an important support is provided for energy conservation and emission reduction of the engine. Meanwhile, only a set of intake channel injection nozzle needs to be additionally added to an existing supercharge gasoline engine, cost is low, upgrading of an existing engine product technology is forcefully supported, and the industrial prospect is good.
Description
Technical field
The present invention relates to and relate to technical field of internal combustion engines, particularly relate to a kind of method that dual fuel injection suppresses supercharging gasoline engine super detonation.
Background technique
Automobile industry is the important component part of China's economic structure, and most of passenger car is all using petrol engine as power resources.Straight spray supercharging small displacement (Downsizing) motor has significantly energy-saving and emission-reduction potentiality relative to conventional engines, obtains significant progress, becoming the main energy saving way of motor in nearly ten years.But application supercharging small displacement technology, motor easily occur under the large load condition of low speed a kind of to motor very harmful, Abnormal combustion phenomenon---the super detonation that not yet fully understands so far.Volkswagen is referred to as Unwanted pre-ignition
[1], AVL company is referred to as Mega Knock
[2], IFP researcher is referred to as pre-ignition
[3], Shell company is referred to as Super-Knock
[4], Tsing-Hua University is referred to as Deto-knock
[5].This new detonation mode very disruptive, instantaneous in-cylinder pressure, even more than 200bar, has become the major obstacle that motor improves specific power.Super detonation research is being actively developed in countries in the world, but its mechanism of production and control strategy are still not clear at present.Existing research shows, super detonation mainly contains following feature: (1), before spark ignition, pre-ignition occurs; (2) after flame propagation, there is jumbo pressure oscillation; (3) general and normal combustion cycle alternately occurs; (4) occur at random, die away.
Whole world Ge great research institution has carried out large quantity research with regard to suppressing the tactful aspect of super detonation.The research of the domestic suppressing method about super detonation is mainly after 2011.Company of Cherry, Tsing-Hua University, Shanghai motor corporation, etc. carried out super detonation influence factor and controlling method research successively, the method for employing mainly enriching and change Variable Valve Time (VVT).The strategy that external Ge great motor corporation and research institution (Volkswagen, GM, KIT, Southwest Research Inst., NGK, IFP) adopt mainly contains enriching, scavenging, cooling EGR.In above-mentioned controlling method, the increase that enriching, scavenging easily cause engine consumption, CO to discharge; Egr system device is complicated, easy reduces engine power density.Therefore, find low cost, do not reduce engine power performance, Main way that the suppression super detonation method of motor Economy and emission performance of not damaging becomes research super detonation braking measure.
Reference:
[1]Jürgen Willand,Marc Daniel,Emanuela,Bernhard Geringer,Peter Hofmann,Markus Kieberger.Limits on Downsizing in SparkIgnition Engines due to Pre-ignition.MTZ 05I2009Volume 70:56-61.
[2]Winklhofer E，Hirsch A，Kapus P，et al.TC GDI engines at veryhigh power density-irregular combustion and thermal risk[C].SAE Paper2009-24-0056.
[3]Jean-Marc Zaccardi,Laurent Duval and Alexandre Pagot.Development of Specific Tools for Analysis and Quantification ofPre-ignition in a Boosted SI Engine.SAE 2009-01-1795.
[4]Kalghatgi G,Bradley D,Andrae J,et al.The nature of‘superknock’and its origins in SI engines.IMechE conference on internalcombustion engines:performance,fuel economy and emissions,London,2009.
[5]Wang Z,Liu H,Song T,et al.Relationship between super-knockand pre-ignition.International Journal of Engine Research,2014,DOI:10.1177/1468087414530388.
Summary of the invention
(1) technical problem that will solve
The object of this invention is to provide a kind of method that cost is low, dual fuel injection that is that do not affect supercharging gasoline engine power character and emission performance suppresses supercharging gasoline engine super detonation, to overcome the problem of supercharging gasoline engine in using process generation super detonation.
(2) technological scheme
In order to solve the problems of the technologies described above, the invention provides a kind of method that dual fuel injection suppresses supercharging gasoline engine super detonation, it is characterized in that: under supercharging gasoline engine low speed high load working condition, single injection event gasoline in intake duct, in firing chamber, one or many sprays Aalcohols fuel.
Preferably, single injection event gasoline in intake duct, an Aalcohols fuel is sprayed in firing chamber 10, in firing chamber, first time sprays and occurs in aspirating stroke, and be within the scope of 60 DEG C of A ATDC ~ 90 DEG C AATDC, or first time injection occurs in compression stroke, is within the scope of DEG C A ATDC of 300 DEG C of AATDC ~ 330, or first time sprays and occurs in combustion stroke, is within the scope of DEG C A ATDC of 360 DEG C of A ATDC ~ 390.
Preferably, single injection event gasoline in intake duct, sprays twice Aalcohols fuel in firing chamber, and first time sprays and occurs in aspirating stroke, and second time is sprayed and occurred in compression stroke.
Preferably, spray twice Aalcohols fuel in firing chamber, first time sprays and is within the scope of DEG C A ATDC of 60 DEG C of AATDC ~ 90, and second time is sprayed and is within the scope of 300 DEG C of A ATDC ~ 330 DEG C AATDC.
Preferably, single injection event gasoline in intake duct, sprays twice Aalcohols fuel in firing chamber, and first time sprays and occurs in aspirating stroke, and second time is sprayed and occurred in combustion stroke.
Preferably, spray twice Aalcohols fuel in firing chamber, first time sprays and is within the scope of DEG C A ATDC of 60 DEG C of AATDC ~ 90, and second time is sprayed and is within the scope of 360 DEG C of A ATDC ~ 390 DEG C AATDC.
Preferably, single injection event gasoline in intake duct, sprays twice Aalcohols fuel in firing chamber, and first time sprays and occurs in compression stroke, and second time occurs in combustion stroke.
Preferably, spray twice Aalcohols fuel in firing chamber, first time sprays and is within the scope of DEG C A ATDC of 300 DEG C of AATDC ~ 330, and second time is sprayed and is within the scope of 360 DEG C of A ATDC ~ 390 DEG C AATDC.
Preferably, single injection event gasoline in intake duct, sprays three Aalcohols fuels in firing chamber, and first time sprays and occurs in aspirating stroke, and is within the scope of DEG C A ATDC of 60 DEG C of A ATDC ~ 90; Second time is sprayed and is occurred in compression stroke, is within the scope of DEG C A ATDC of 300 DEG C of A ATDC ~ 330; Third time sprays and occurs in combustion stroke, is within the scope of 360 DEG C of A ATDC ~ 390 DEG C AATDC.
Preferably, after described dual fuel injection, the overall excess air coefficient ratio in described firing chamber is 1.
(3) beneficial effect
Dual fuel injection provided by the invention suppresses supercharging gasoline engine super detonation method at the intake port injection gasoline of described motor, in firing chamber, one or many sprays Aalcohols fuel, the Aalcohols fuel of the high latent heat of vaporization sprays can reduce intake temperature in aspirating stroke, increase volumetric efficiency, improve power character; Compression stroke injection can reduce compression terminal mixture temperature and effectively suppress pre-ignition; Spray in combustion process and can form fuel stratification mixed gas, cut off the propagation path of detonation wave; Utilize one or many to spray the generation effectively suppressing supercharging small-displacement gasoline engine super detonation, thus provide important support for engine energy-saving reduces discharging.Meanwhile, this system only needs on existing supercharging gasoline engine, install a set of intake port injection nozzle additional, and cost is low, and provide the upgrading of available engine product technology and provide powerful support for, industrialization prospect is good.
Accompanying drawing explanation
Fig. 1 is the structural representation of supercharging gasoline engine;
In figure, 1: intake duct; 2: air outlet flue; 3: petrol jet; 4: Aalcohols fuel nozzle; 5: spark plug; 6: connecting rod; 7: crank; 8: bent axle; 9: piston; 10: firing chamber.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following instance for illustration of the present invention, but is not used for limiting the scope of the invention.
Fig. 1 is used to aid illustration and utilizes dual fuel injection to suppress the supercharging gasoline engine structural representation of supercharging gasoline engine super detonation method.In Fig. 1, petrol jet 3 is arranged in intake duct 1, Aalcohols fuel nozzle 4 is arranged in firing chamber 10, air enters firing chamber 10 by intake duct 1, piston 9 moves downward, air is full of in firing chamber 10, the mixture of gasoline and Aalcohols fuel, then piston 9 upwards returns, with pressurized air, the mixture of gasoline and Aalcohols fuel, when piston 9 reaches the top of its stroke, spark plug 5 sends spark, light air, the mixture of gasoline and Aalcohols fuel, its energy produced promotes piston 9 and moves downward, when piston 9 arrives the bottom of its stroke, waste gas discharges firing chamber 10 through air outlet flue 2, piston 9 turns back to top, thus complete a four stroke cycle, supercharging gasoline engine constantly carries out four stroke cycle makes piston 9 ceaselessly move up and down, and through connecting rod 6 and crank 7, moving up and down of piston 9 is converted to the rotary motion of bent axle 8.
Under normal circumstances, first be set in Aalcohols fuel nozzle 4 in petrol jet 3 in a four stroke cycle in intake duct 1 and firing chamber 10 and respectively spray primary fuel, when supercharging gasoline engine in the running, petrol jet 3 injected petrol be arranged in intake duct 1 as shown in Figure 1, preferably, injected petrol amount accounts for 50% ~ 80% of total fuel quantity, when crank angle (CA ATDC) is within the scope of 0 ° ~ 180 °, supercharging gasoline engine is in aspirating stroke, Aalcohols fuel nozzle 4 in firing chamber 10 carries out first time and sprays, spraying the scope occurred is 60 DEG C of A ATDC ~ 90 DEG C AATDC, preferably, the Aalcohols fuel amount of spraying accounts for 50% ~ 20% of total fuel quantity, injection Aalcohols fuel amount accounts in firing chamber 10 sprays 100% of Aalcohols fuel total amount, the Aalcohols fuel that the firing chamber 10 inherent aspirating stroke phase sprays, intake temperature can be reduced, prevent pre-ignition from producing, and then prevent the generation of super detonation, and increase volumetric efficiency, improve power character.
When in aspirating stroke, after carrying out an Aalcohols fuel injection in firing chamber 10, still there occurs super detonation or systems axiol-ogy to the condition that super detonation occurs, on-line system can be demarcated according to storage data in system and existing comprehensive condition and contrast, then the number of times of injection Aalcohols fuel in this four stroke cycle or next four stroke cycle in firing chamber 10 or the moment of injection is determined, if on-line system judges still once to spray in firing chamber 10 according to comprehensive condition, but need further to reduce mixture temperature, prevent pre-ignition from producing, the moment of then spraying generation can adjust to compression stroke, preferably, injection occurs within the scope of DEG C A ATDC of 300 DEG C of AATDC ~ 330, if need to form fuel stratification mixed gas in firing chamber 10, cut off the propagation path of detonation wave, the moment of then spraying generation can adjust to combustion stroke, preferably, injection occurs within the scope of DEG C A ATDC of 360 DEG C of A ATDC ~ 390, by to spraying the adjustment in Aalcohols fuel moment in firing chamber 10 to reach the object suppressing super detonation.
If according to comprehensive condition, on-line system judges that needing to carry out twice Aalcohols fuel injection in firing chamber 10 just can prevent or suppress super detonation to occur, and be set in aspirating stroke according to comprehensive condition and carry out first time injection, injection occurs within the scope of DEG C A ATDC of 60 DEG C of A ATDC ~ 90, first reduce intake temperature, prevent pre-ignition from producing, then carry out second time in the combustion stroke phase to spray, the scope of spraying occurs within the scope of DEG C A ATDC of 300 DEG C of A ATDC ~ 330, further reduction fuel combination temperature, prevent pre-ignition from producing, and then prevent super detonation from producing, or first time sprays and occurs in aspirating stroke, injection occurs within the scope of 60 DEG C of A ATDC ~ 90 DEG C AATDC, first reduce intake temperature, prevent pre-ignition from producing, second time is sprayed and is occurred in the combustion stroke phase, and the scope of injection occurs within the scope of DEG C A ATDC of 360 DEG C of A ATDC ~ 390, forms fuel stratification mixed gas, cut off the propagation path of detonation wave, reach the effect suppressing super detonation, or first time sprays and occurs in compression stroke, injection occurs within the scope of DEG C A ATDC of 300 DEG C of AATDC ~ 330, reduce compression terminal mixture temperature temperature, prevent pre-ignition from producing, second time is sprayed and is occurred in the combustion stroke phase, and the scope of injection occurs within the scope of DEG C A ATDC of 360 DEG C of AATDC ~ 390, forms fuel stratification mixed gas, cut off the propagation path of detonation wave, reach the effect suppressing super detonation, preferably, in firing chamber 10, the Aalcohols fuel amount of first time injection accounts in firing chamber 10 and sprays less than 50% of Aalcohols fuel total amount, the Aalcohols fuel amount that second time is sprayed accounts in firing chamber 10 sprays more than 50% of Aalcohols fuel total amount, and it is 100% that the Aalcohols fuel of twice injection accounts for burner oil summation in firing chamber.
When according to comprehensive condition, on-line system judges that needing to carry out three times in firing chamber 10 sprays, and occur in aspirating stroke according to comprehensive condition setting first time injection, injection occurs within the scope of DEG C A ATDC of 60 DEG C of A ATDC ~ 90, first reduce intake temperature, prevent pre-ignition from producing, then carry out second time in compression stroke to spray, injection occurs within the scope of 300 DEG C of A ATDC ~ 330 DEG C AATDC, further reduction mixture temperature, prevent pre-ignition from producing, and then prevent super detonation from producing, then carry out third time in combustion stroke to spray, injection occurs within the scope of DEG C A ATDC of 360 DEG C of AATDC ~ 390, fuel stratification mixed gas is formed in firing chamber 10, cut off the propagation path of detonation wave, reach the effect suppressing super detonation, in the circulation of 10, firing chamber, required Aalcohols fuel problem divides three injections, preferably, in firing chamber 10, first time injection alcohols amount accounts in firing chamber 10 and sprays less than 50% of alcohols total amount, second time spray alcohols amount account in firing chamber 10 spray alcohols total amount 50 ~ 100% between, but do not comprise 100%, and emitted dose and second time emitted dose summation are less than 100% for the first time, third time sprays alcohols amount and then determines according to the amount that first time sprays and second time is sprayed.
When CA ATDC is within the scope of 540 ° ~ 720 °, supercharging gasoline engine be in the exhaust stroke phase, waste gas discharges firing chamber 10 from air outlet flue 2, and exhaust stroke terminates, and supercharging gasoline engine enters next four stroke cycle.In firing chamber 10, multi-injection Aalcohols fuel forms weak mixture around the wall of firing chamber 10, partially dense mixed gas is formed around spark plug, whole firing chamber forms layering equivalent proportion mixed gas, and still keep overall excess air coefficient to be 1, the high-efficient purification of three-way catalyst can be ensured, as dense district and rare district can reach homogeneous state, the generation of soot can be prevented, reduce noxious gas emission.
The injection proportion of the interior Aalcohols fuel sprayed of the Fuel Petroleum sprayed in intake duct 1 and firing chamber 10, to be demarcated according to storage data in different situations and system by on-line control system and contrast, and real-time online regulates, the suppression super detonation effect of expecting under can realizing different operating mode, thus directly spray lightweight motor for realizing supercharging important support is provided.
In sum, dual fuel injection provided by the invention suppresses supercharging gasoline engine super detonation method at the intake port injection gasoline of described motor, in firing chamber 10, one or many sprays Aalcohols fuel, the Aalcohols fuel of the high latent heat of vaporization sprays and can reduce intake temperature carrying out stroke, increase volumetric efficiency, improve power character; Compression stroke injection can reduce compression terminal mixture temperature and effectively suppress pre-ignition; Spray in combustion process and can form fuel stratification mixed gas, cut off the propagation path of detonation wave; Utilize one or many to spray the generation effectively suppressing supercharging small-displacement gasoline engine super detonation, thus provide important support for engine energy-saving reduces discharging.Meanwhile, this system only needs on existing supercharging gasoline engine, install a set of intake port injection nozzle additional, and cost is low, and provide the upgrading of available engine product technology and provide powerful support for, industrialization prospect is good.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. dual fuel injection suppresses a method for supercharging gasoline engine super detonation, it is characterized in that: under supercharging gasoline engine low speed high load working condition, single injection event gasoline in intake duct, and in firing chamber, one or many sprays Aalcohols fuel.
2. the method for claim 1, it is characterized in that: single injection event gasoline in intake duct, an Aalcohols fuel is sprayed in firing chamber, in firing chamber, first time sprays and occurs in aspirating stroke, and be within the scope of DEG C A ATDC of 60 DEG C of A ATDC ~ 90, or first time injection occurs in compression stroke, is within the scope of DEG C A ATDC of 300 DEG C of A ATDC ~ 330, or first time sprays and occurs in combustion stroke, is within the scope of DEG C A ATDC of 360 DEG C of A ATDC ~ 390.
3. the method for claim 1, is characterized in that: single injection event gasoline in intake duct, sprays twice Aalcohols fuel in firing chamber, and first time sprays and occurs in aspirating stroke, and second time is sprayed and occurred in compression stroke.
4. method as claimed in claim 3, it is characterized in that: spray twice Aalcohols fuel in firing chamber, first time sprays and is within the scope of DEG C A ATDC of 60 DEG C of A ATDC ~ 90, second time is sprayed and is within the scope of DEG C A ATDC of 300 DEG C of A ATDC ~ 330.
5. the method for claim 1, is characterized in that: single injection event gasoline in intake duct, sprays twice Aalcohols fuel in firing chamber, and first time sprays and occurs in aspirating stroke, and second time is sprayed and occurred in combustion stroke.
6. method as claimed in claim 5, it is characterized in that: spray twice Aalcohols fuel in firing chamber, first time sprays and is within the scope of DEG C A ATDC of 60 DEG C of A ATDC ~ 90, second time is sprayed and is within the scope of DEG C A ATDC of 360 DEG C of A ATDC ~ 390.
7. the method for claim 1, is characterized in that: single injection event gasoline in intake duct, sprays twice Aalcohols fuel in firing chamber, and first time sprays and occurs in compression stroke, and second time occurs in combustion stroke.
8. method as claimed in claim 7, it is characterized in that: spray twice Aalcohols fuel in firing chamber, first time sprays and is within the scope of DEG C A ATDC of 300 DEG C of A ATDC ~ 330, second time is sprayed and is within the scope of DEG C A ATDC of 360 DEG C of A ATDC ~ 390.
9. the method for claim 1, is characterized in that: single injection event gasoline in intake duct, sprays three Aalcohols fuels in firing chamber, and first time sprays and occurs in aspirating stroke, and is within the scope of DEG C A ATDC of 60 DEG C of A ATDC ~ 90; Second time is sprayed and is occurred in compression stroke, is within the scope of DEG C A ATDC of 300 DEG C of A ATDC ~ 330; Third time sprays and occurs in combustion stroke, is within the scope of DEG C A ATDC of 360 DEG C of A ATDC ~ 390.
10. the method as described in any one of claim 1-9, is characterized in that: after described dual fuel injection, and the overall excess air coefficient in described firing chamber is 1.
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| CN105041512A (en) * | 2015-05-31 | 2015-11-11 | 清华大学 | Lean burn method of dual-fuel engine |
| CN105201670A (en) * | 2015-09-08 | 2015-12-30 | 清华大学 | Method and device for inhibiting super-knock of supercharged direct-injection engine |
| CN105386882A (en) * | 2015-10-26 | 2016-03-09 | 重庆长安汽车股份有限公司 | Preignition control method for supercharge non-direct-injection gasoline engine |
| CN108368783A (en) * | 2015-12-23 | 2018-08-03 | 瓦锡兰芬兰有限公司 | Method and piston engine for operated piston engine |
| CN109611192A (en) * | 2018-12-26 | 2019-04-12 | 重庆长安汽车股份有限公司 | A kind of gasoline engine high pressure sprays into device, engine and the automobile of gas |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105041512A (en) * | 2015-05-31 | 2015-11-11 | 清华大学 | Lean burn method of dual-fuel engine |
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| CN105386882A (en) * | 2015-10-26 | 2016-03-09 | 重庆长安汽车股份有限公司 | Preignition control method for supercharge non-direct-injection gasoline engine |
| CN108368783A (en) * | 2015-12-23 | 2018-08-03 | 瓦锡兰芬兰有限公司 | Method and piston engine for operated piston engine |
| CN108368783B (en) * | 2015-12-23 | 2021-01-01 | 瓦锡兰芬兰有限公司 | Method for operating a piston engine and piston engine |
| CN109611192A (en) * | 2018-12-26 | 2019-04-12 | 重庆长安汽车股份有限公司 | A kind of gasoline engine high pressure sprays into device, engine and the automobile of gas |
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