CN104791141A - Method for forming mixed gas for two-stroke LPG direct-injection engine achieving hierarchical lean combustion - Google Patents
Method for forming mixed gas for two-stroke LPG direct-injection engine achieving hierarchical lean combustion Download PDFInfo
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- CN104791141A CN104791141A CN201510113709.7A CN201510113709A CN104791141A CN 104791141 A CN104791141 A CN 104791141A CN 201510113709 A CN201510113709 A CN 201510113709A CN 104791141 A CN104791141 A CN 104791141A
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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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- 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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- Output Control And Ontrol Of Special Type Engine (AREA)
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Abstract
The invention relates to a method for forming mixed gas for a two-stroke LPG direct-injection engine for an extended-range type electric vehicle generator set. According to the main technical scheme, a two-stroke engine cylinder head is only provided with a longitudinal air intake duct, an air intake valve and a rotational flow fuel injector. The longitudinal air intake duct and the fuel injector are arranged on one side of the centerline of a cylinder; an air outlet is located on the other side of the centerline of the cylinder, and when a piston is located at the bottom dead center, the lower edge of the air outlet is flush with the piston top. Under a heavy load working condition, before the piston moves upwards to close the air outlet, LPG is injected, LPG-air mixing time is prolonged, and the homogeneous mixed gas in the cylinder is obtained. According to the technical scheme, the two-stroke engine cylinder head is only provided with the air intake duct, the air intake valve and the rotational flow fuel injector while the air outlet is arranged at the lower portion of the cylinder, so that longitudinal air intake tumbling, LPG injection time and guidance of the bent piston top are used effectively, and obvious hierarchical construction of the mixed gas in the cylinder with a partial load working condition is achieved.
Description
Technical field
The present invention relates to the mixed Daqu method of two-stroke spark-ignition direct injection (sidi) engines.Specifically LPG adopt the present invention to propose as the two-stroke spark ignition electric controlled direct spray motor of fuel the wall-guided combustion system that longitudinal intake duct and suction valve are set in cylinder head based on mixed Daqu method, but not the mixed Daqu method of the two-stroke spark ignition engine of now widely used crankcase scavenging.
Background technique
Stroke-increasing electric automobile is one of most important developing direction of current new-energy automobile, its equipped low-powered engine, be operated in most economical operating mode zone and move electrical power generators, fuel economy is good, improve continual mileage, it has the advantages such as rotating speed is high, specific power large, compact structure compared with four stroke engine, the present invention proposes the motion it being developed as stroke-increasing electric automobile generator set power source for this reason.But no matter traditional carburetor type two-stroke gasoline engine adopts that scavenging mode all to also exist, and ventilation overlap period is long, incoming mixture runs off from relief opening, the shortcomings such as fuel economy is poor, HC discharge height; Also report is had in the homogeneous combustion mode of injection or inner cylinder direct injection before existing crankcase scavenging two-stroke gasoline engine repacking scavenging port, but the feature of the operating conditions (moderate duty, rotating speed are high) in view of stroke-increasing electric automobile generator set two stroke engine, design new combustion system, it is necessary for adopting layering lean combustion mode to improve Fuel Economy under Partial Load.
Automotive LPG boiling point is low, full vapor tension of closing is high, make full use of it and be easy to carburation by evaporation, be conducive in compression process, the feature that when later stage fuel sprays, inflammable mixture is formed, the present invention proposes layering lean combustion two-stroke LPG direct fuel-injection engine combustion system, it adopts eddy flow oil sprayer, in cylinder head, longitudinal intake duct and suction valve are only set, stream and LPG spray angle are rolled in the air inlet formed, bending piston phasing coordinates, in compression process close to being at the end closely close to the rich mixture being formed and be easy to catch fire at sparking-plug electrode, and the air fuel ratio of whole firing chamber reaches more than 40:1.And relief opening is in the bottom of cylinder, when cold start-up, transient operating modes, high load working condition, before piston stroking upward closes relief opening, LPG sprays, to realize the homogeneous charge in cylinder.The mixed Daqu method of the above-mentioned two-stroke LPG direct fuel-injection engine that the present invention proposes not yet is seen.
Reference: (1) Tan, Y.and Gitano， H。， "Design of Retrofit Kit for LPG Driven Direct Injection Two-Stroke Engines，" SAE Technical Paper 2012-32-0117， 2012， doi:10。4271/2012-32-0117。
（2）Loganathan， M。; Ramesh， A。“Study on manifold injection of LPG in two stroke SI engine” Journal of the Energy Institute， Volume 80， Number 3， September 2007 ， pp。168-174(7)。
Summary of the invention
Technical assignment of the present invention is to provide a kind of mixed Daqu method of the two-stroke LPG direct fuel-injection engine based on stroke-increasing electric automobile generator set.
Technical assignment of the present invention realizes in the following manner:
Cylinder head only arranges longitudinal intake duct and suction valve, and adopts eddy flow oil sprayer.Longitudinal intake duct and oil sprayer are arranged in cylinder centerline side, during partial load condition, LPG sprayed in the compression intermediary and later stages, the air inlet utilizing longitudinal intake duct to be formed is rolled stream and is closed with bending piston top matching form, when spark plug sparking by near LPG spraying guiding sparking-plug electrode, form charge stratification structure in cylinder.
And the bottom of relief opening heart line opposite side in the cylinder, when piston is positioned at lower dead center, relief opening lower edge is concordant with piston top.When cold start-up, transient operating modes, high load working condition, before piston stroking upward closes relief opening, LPG sprays, and adds LPG-air mixture time, to realize homogeneous charge in cylinder.
Up and down reciprocatingly once, what complete motor enters-presses-quick-fried-row's work cycle to piston.Spark plug can tilt to press dress by dress or to cylinder centerline opposite side by vertical cylinder center line, it is 35-50 ° that eddy flow oil sprayer is installed in the bottom of the close pentroof combustion chamber of intake duct homonymy, its axis and substantially horizontal, its principle is that both coordinate well, and the LPG spraying under piston crater is guided arrives near sparking-plug electrode preferably.
Shown by the preliminary experiment of Computer Numerical Simulation and actual single-cylinder engine, the layering lean combustion two-stroke LPG direct fuel-injection engine that the present invention proposes compares general premixing homogenous combustion two-stroke direct fuel-injection engine, when partial load condition, fuel consumption rate can reduce 10-15%.
Accompanying drawing explanation
Accompanying drawing 1 is two-stroke combustion system provided by the invention close to cross-sectional view during spark plug sparking.
Accompanying drawing 2 is the cross-sectional view of two-stroke combustion system provided by the invention when piston is positioned at lower dead center.
In figure: 1, pentroof combustion chamber, 2, longitudinal intake duct, 3, suction valve, 4, eddy flow oil sprayer, 5, bending top piston, 6, LPG spraying, 7, spark plug, 8, relief opening, 9, flow of fresh air is through route.
Embodiment
Embodiment: use cylinder diameter D=72mm, effective compression ratio
ε=the two stroke engine of 8.5, the cylinder head (pentroof combustion chamber) 1 of transformation is provided with and can forms longitudinal intake duct 2, single hole eddy flow oil sprayer 4(injection diameter Ф=0.35mm, the LPG jet pressure 5MPa that stream is rolled in air inlet), intake duct 2 and eddy flow oil sprayer 4 are positioned on the right side of cylinder center, oil sprayer 4 axis and substantially horizontal angle 45 °, and the axis of spark plug 7 is tilted to the left 20 ° from cylinder center.Relief opening 8 is opened above the piston lower dead center on the left of heart line in the cylinder, makes piston up and down reciprocatingly once, completes into-pressure-quick-fried-row's work cycle.According to signals such as crankshaft top dead center position, rotating speed and manifold air pressure, spray instrument control fuel injection time point, pulsewidth and firing time by engine ignition-fuel.According to the partial load condition (example: 4800 revs/min, 60% Rate of load condensate) that stroke-increasing electric automobile generator set two-stroke matches, have employed compression process budc 60 ° of CA LPG to spray, the air inlet formed by longitudinal intake duct 2 is rolled stream and is matched with LPG spray angle, bending piston top 5, when spark plug 7 arcing (budc 25 ° of CA), by LPG spraying 6 guiding spark plug 7 ate electrode, form the charge stratification structure in cylinder.
When cold start-up, transient operating modes, high load working condition, adopt 80 ° of CA LPG after bottom dead center to spray, LPG has more sufficient incorporation time with the air flowing into cylinder, defines homogeneous charge.
Test shows, when partial load condition works under air fuel ratio A/F>40:1, the fuel consumption rate of the more general premixed and homogenized combustion manner of the present invention can reduce by more than 10%.
Claims (3)
1. the mixed Daqu method of layering lean combustion two-stroke LPG direct fuel-injection engine, comprises pentroof combustion chamber, longitudinal intake duct, suction valve, eddy flow oil sprayer, bending top piston, and LPG sprays, spark plug, relief opening, and fresh air flows through relief opening route; Two stroke engine cylinder head is only arranged longitudinal intake duct and suction valve, eddy flow oil sprayer; Longitudinal intake duct and oil sprayer are arranged in cylinder centerline side; And relief opening heart line opposite side in the cylinder, when piston is positioned at lower dead center, relief opening lower edge is concordant with piston top; Spark plug axis to be tilted to the left 10-50 ° from cylinder centerline, and up and down reciprocatingly once, what complete motor enters-press-quick-fried-row's work cycle to piston; It is characterized in that: during partial load condition, LPG sprays at compression process budc 60-65 ° of CA, the air inlet that longitudinal intake duct is formed is rolled stream and is cooperatively interacted with bending piston top shape, when spark plug sparking (budc 20-25 ° of CA) by be easy to catch fire LPG inflammable mixture guiding sparking-plug electrode near, form the charge stratification structure in cylinder, and the overall air fuel ratio A/F>40:1 of cylinder.
2. the mixed Daqu method of layering lean combustion two-stroke LPG direct fuel-injection engine according to claim 1, it is characterized in that: relief opening is in piston stroking upward 60-65 ° of CA closedown extremely after bottom dead center, when cold start-up, transient operating modes, high load working condition, ensureing that the 35-40 after bottom dead center ° of CA LPG that fuel is not escaped sprays, to realize homogeneous charge in cylinder.
3. the mixed Daqu method of layering lean combustion two-stroke LPG direct fuel-injection engine according to claim 1, is characterized in that: the same structure that to be also applicable to gasoline, CNG be fuel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510113709.7A CN104791141B (en) | 2015-03-16 | 2015-03-16 | It is layered the mixed Daqu method of lean burn two-stroke LPG direct fuel-injection engines |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510113709.7A CN104791141B (en) | 2015-03-16 | 2015-03-16 | It is layered the mixed Daqu method of lean burn two-stroke LPG direct fuel-injection engines |
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| CN104791141A true CN104791141A (en) | 2015-07-22 |
| CN104791141B CN104791141B (en) | 2017-12-08 |
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| CN201510113709.7A Expired - Fee Related CN104791141B (en) | 2015-03-16 | 2015-03-16 | It is layered the mixed Daqu method of lean burn two-stroke LPG direct fuel-injection engines |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109236504A (en) * | 2018-11-22 | 2019-01-18 | 潍坊力创电子科技有限公司 | Gas engine air/gas mixing arrangement |
| CN110534005A (en) * | 2019-09-05 | 2019-12-03 | 山东建筑大学 | A kind of simulation demonstrating apparatus of soil liquefaction disaster |
| CN112555017A (en) * | 2019-09-26 | 2021-03-26 | 联合汽车电子有限公司 | Lean combustion system, lean combustion engine and lean combustion method |
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| CN2379608Y (en) * | 1999-08-06 | 2000-05-24 | 贾平安 | Double air in-taking route type two stroke gasoline engine |
| JP2000507664A (en) * | 1996-04-05 | 2000-06-20 | アウトボード・マリーン・コーポレーション | Cross scavenging, stratified combustion chamber for two-stroke internal combustion engine |
| CN2516710Y (en) * | 2001-10-17 | 2002-10-16 | 曹建峰 | Piston motion type air inlet-out two-stroke engine |
| CN1546850A (en) * | 2003-12-08 | 2004-11-17 | 赖大鹏 | Dual fuel injector direct spraying and slide exhaust valve type turbine supercharging two-stroke petrol engine |
| CN201306206Y (en) * | 2008-12-02 | 2009-09-09 | 江苏大学 | Internal direct-injection natural-gas double-air-valve engine rareness layering combustion chamber structure |
| CN103362691A (en) * | 2012-04-09 | 2013-10-23 | 许伯彦 | Forming method of mixed gas of layered lean-burn spraying-wall face combined-guiding LPG direct injection supercharged engine |
-
2015
- 2015-03-16 CN CN201510113709.7A patent/CN104791141B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000507664A (en) * | 1996-04-05 | 2000-06-20 | アウトボード・マリーン・コーポレーション | Cross scavenging, stratified combustion chamber for two-stroke internal combustion engine |
| CN2379608Y (en) * | 1999-08-06 | 2000-05-24 | 贾平安 | Double air in-taking route type two stroke gasoline engine |
| CN2516710Y (en) * | 2001-10-17 | 2002-10-16 | 曹建峰 | Piston motion type air inlet-out two-stroke engine |
| CN1546850A (en) * | 2003-12-08 | 2004-11-17 | 赖大鹏 | Dual fuel injector direct spraying and slide exhaust valve type turbine supercharging two-stroke petrol engine |
| CN201306206Y (en) * | 2008-12-02 | 2009-09-09 | 江苏大学 | Internal direct-injection natural-gas double-air-valve engine rareness layering combustion chamber structure |
| CN103362691A (en) * | 2012-04-09 | 2013-10-23 | 许伯彦 | Forming method of mixed gas of layered lean-burn spraying-wall face combined-guiding LPG direct injection supercharged engine |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109236504A (en) * | 2018-11-22 | 2019-01-18 | 潍坊力创电子科技有限公司 | Gas engine air/gas mixing arrangement |
| CN109236504B (en) * | 2018-11-22 | 2023-08-29 | 潍坊力创电子科技有限公司 | Air/gas mixing device for gas engine |
| CN110534005A (en) * | 2019-09-05 | 2019-12-03 | 山东建筑大学 | A kind of simulation demonstrating apparatus of soil liquefaction disaster |
| CN112555017A (en) * | 2019-09-26 | 2021-03-26 | 联合汽车电子有限公司 | Lean combustion system, lean combustion engine and lean combustion method |
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