CN103362691A - Forming method of mixed gas of layered lean-burn spraying-wall face combined-guiding LPG direct injection supercharged engine - Google Patents
Forming method of mixed gas of layered lean-burn spraying-wall face combined-guiding LPG direct injection supercharged engine Download PDFInfo
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- CN103362691A CN103362691A CN201210099849XA CN201210099849A CN103362691A CN 103362691 A CN103362691 A CN 103362691A CN 201210099849X A CN201210099849X A CN 201210099849XA CN 201210099849 A CN201210099849 A CN 201210099849A CN 103362691 A CN103362691 A CN 103362691A
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Abstract
The invention relates to a forming method of mixed gas of a layered lean-burn spraying-wall face combined-guiding LPG direct injection supercharged engine. The method is mainly characterized in that a large-inclination-angle bottom-face pit is formed in the top of a piston, the center of the pit deviates from the axis of a cylinder, and the symmetry axis (the bottom) of the pit deflects downward by 40 degrees in the anti-clockwise direction; three-hole spray nozzle high-pressure center injection is adopted, part of LPG is injected to the position close to a sparking plug electrode to directly form the combustible mixed gas in a spraying guiding mode at the later stage of the compression process, and the other part of fuel injected into the combustion chamber pit provided with the large-inclination-angle bottom face goes upward along with a piston to the position close to a sparking plug to form the combustible mixed gas in a wall-face guiding mode under the action of entrainment vortex and air intake vortex in the pit; under the partial load work condition, one air intake valve is closed, and air flow enters a cylinder only through the other air intake valve to form air intake vortex. Under the large load condition, the two air intake valves are opened at the same time, the air intake early stage ((70 degrees CA ATDC) LPG injection is adopted to form homogeneous mixed gas in the cylinder. Under the cold starting and turbine heating conditions, the air intake early stage LPG injection is also adopted. In comparison with an existing engine, the lean-burn limit (air-fuel ratio A/F > 60:1) of the layered mixed gas is further widened, and fuel consumption can be reduced by more than 10%. The method is also applicable to a layered lean-burn direct injection supercharged gasoline engine.
Description
Technical field
The present invention relates to the mixed gas formation method of spark ignition engine.Charge stratification structure in the cylinder of lean combustion mode when partial load condition, is adopted in the automatically controlled in-cylinder direct injection supercharged engine that acts as a fuel of the LPG firing chamber that spraying-wall compound guiding fuel sprays of adopting the present invention to propose specifically; And when high load working condition, adopt the mixed gas formation method of premixed and homogenized combustion manner.
Background technique
The LPG automobile have cold starting good, compare with gasoline, diesel oil, the advantages such as the PM that generates during burning, CO2 are few, in the today that enters low-carbon economy, replace gasoline to become current development trend for reducing city greenhouse gases effect with LPG, be specially adapted to the long urban taxi of distance travelled every day.But the research of spark ignition in-cylinder direct injection LPG motor is still with existing direct spray petrol engine in cylinder transformation at present, therefore, is necessary that the simple present situation of summarizing direct spray petrol engine in cylinder will help proposition of the present invention first.At present the directly jetting gasoline engine combustion system of report has two kinds: 1. wall leading type: such as Mitsubishi GDI, the Japanese D-4 of Toyota etc.2. spray-guided: such as germany volkswagen TSI, FSI etc." wall leading type " system mainly forms mixed gas by spray bundle angle, cooperation piston-shaped, air motion.If it is improper that cooperation slightly has, the fuel oil Shu Yi that goes out from cylinder one side spray adheres at piston face and opposite side cylinder wall formation fuel oil, and the HC discharging is sharply increased.The fuel oil bundle of " spray-guided " system directly sprays to spark plug, forms the mixed gas that can light near electrode, and it has preferably fuel economy.But from the too close spark plug of the oil bundle of nozzle ejection, easy wetting sparking-plug electrode causes carbon deposit and ignition difficulties; It does not have pit and does not organize In Cylinder Flow simultaneously, the possibility that exists near the mixed gas overrich of spark plug not light when running up.
Also to point out, even charge stratification structure in the cylinder, the concentration of still wishing near the inflammable mixture district that sparking-plug electrode is is homogeneous, yet the fuel delivery per cycle that increases after the supercharging easily causes the partial mixture overrich, because not organizing In-cylinder flow, partial mixture homogeneity is obvious not.Add the problem of fuel qualities, the in-cylinder direct injection supercharging gasoline engine of therefore introducing to the market has at present all still been used the premixed and homogenized burning (popular 1.4L " TSI ", 1.6L " FSI ") of chemically correct fuel.But, Economy and reduction discharging are mathematical when adopting the layering lean combustion to improve sub load, take full advantage of high, the full characteristics such as decompression boiling phenomenon of closing the high spray bundle that forms of vapor tension of LPG octane value, for further enlarging the lean flammability limit of stratified mixtures, solve near the mixed gas overrich of partial load condition sparking-plug electrode, HC, NO
xDischarging risings etc. the present invention proposes spraying-wall compound guiding combustion system.By optimizing repeatedly LPG spray orifice footpath, combustion recess shape and charge motion etc., adopt 3 hole nozzles to be more conducive to approach at the end in compression stroke, near the part of fuel of injection enters combustion recess in addition directly generating inflammable mixture the sparking-plug electrode LPG spray bundle entrainments in intake swirl and pit under the effect in whirlpool and goes upward to rapidly near the sparking-plug electrode.The mixed gas formation method of above-mentioned " compound guiding " LPG in-cylinder direct injection supercharged engine that the present invention proposes is not yet seen.
Reference: (1) Kawamoto M, Honda T and Katashiba H, et al.A study of center and side injection in spray guided DISI concept[C] .SAE paper 2005-01-0106 (2) Yang Shichun, Li Jun, Li Degang. Analysis on Development for Gasoline Direct Injection Technology [J]. vehicular engine, 2007,5 (171): 8-13
Summary of the invention
Technical assignment of the present invention provides a kind of mixed gas formation method based on spraying-wall compound guiding LPG in-cylinder direct injection supercharged engine.
Technical assignment of the present invention is realized in the following manner:
1) firing chamber is made of the pit that ridge-roof type top and piston head have the large inclined angle bottom surface, and pit centres departs from cylinder-bore axis, and the pit axis of symmetry (recess) deflects down 40 ° in the counterclockwise direction.
2) spark plug is arranged in the position of suitably leaving nozzle on the symmetrical line of two exhaust valves; 3 hole nozzles are installed on the center, firing chamber, its axis rolls tiltedly to spark plug, make the compression process later stage form inflammable mixture under the effect of intake swirl near the part LPG of 2 holes on nozzle top ejection spraying directly arrives sparking-plug electrode.
3) the compression process later stage then arrives the pit with large inclined angle bottom surface from another part LPG of 1 hole of nozzle bottom ejection spraying, and is up along pocket wall under the effect of large inclined angle bottom surface and intake swirl, himself entrainment the whirlpool and will promote that also the LPG mixed gas moves to the spark plug electrode direction along what the pit wall formed.Intake swirl can also make the LPG spraying that sprays into pit keep relatively concentrated, is conducive to form the rich mixture zone.
4) close an intake valve during partial load condition, air-flow only enters cylinder by another intake valve, and then forms stronger intake swirl under the casing wall effect.And two intake manifold are opened simultaneously during high load working condition, and spray with air inlet (70 ° of CA ATDC) LPG in early stage and to match, and form homogeneous charge in the cylinder.Also adopt air inlet LPG in early stage to spray when cold starting, warming-up operating mode.
5) shown by the preliminary experiment on computer numerical parsing and optical visible experiment and the real engine, the layering lean combustion mode that the present invention proposes is compared with general premixing uniform combustion mode, during partial load condition, fuel consumption rate can reduce more than 10%.
Description of drawings
Accompanying drawing 1 is for the invention provides spraying-wall compound guiding combustion system longitudinal profile structural representation.
Accompanying drawing 2 is for the invention provides spraying-wall compound guiding combustion system horizontal section structural representation
Among the figure: 1, combustion recess, 2,3 hole nozzles, 3, spark plug, 4, intake swirl, 5, the 2 hole LPG spraying on top, 6, the LPG spraying of bottom, 7, the LPG mixed gas, 8, one-sided intake manifold, 9, pit centres, 10, the pit lowest part.
Embodiment
Embodiment: on the motor of cylinder diameter D=85mm, the firing chamber consists of compression ratio ε=10.5～11 by the pit 1 that has large inclined angle (θ) bottom surface on ridge-roof type top and the piston.Spark plug 3 is arranged in the position of suitably leaving nozzle on the symmetrical line of two exhaust valves, three holes (total area of nozzle hole A=0.0643mm
2) nozzle 2 is installed on center, firing chamber, its axis to spark plug direction tilt (Fig. 1).Make the compression process later stage under intake swirl 4 effects near the part LPG of 2 holes on nozzle top (orifice diameter of phi=0.11mm, angle of attack are rotated counterclockwise 20 °, 40 ° along horizontal axis) ejection spraying 5 directly arrives sparking-plug electrode.From another part LPG of 1 hole of nozzle bottom (orifice diameter of phi=0.24mm, angle of attack are rotated counterclockwise 40 ° along horizontal axis) ejection spraying 6 then arrival have the pit 1 of large inclined angle bottom surface, intake swirl and entrainmenting under the effect of whirlpool of forming along the pit wall, LPG mixed gas 7 is to concentrating (Fig. 2) near the sparking-plug electrode.
According to signals such as crankshaft top dead center position, rotating speed and air inlet absolute pressures, spray instrument control fuel injection pulsewidth and firing time by engine ignition-fuel.By intake manifold 8 of closed electromagnetic valve, the air that flows into cylinder from another inlet manifold forms strong intake swirl under the casing wall constraint during partial load condition (example: 2000 rev/mins).And two intake manifold are opened simultaneously during high load working condition, and adopt air inlet (70 ° of ℃ of A of atdc) LPG in early stage to spray, and LPG has fully incorporation time with the air that flows into cylinder, to form homogeneous charge.And in order to improve cold starting performance and to shorten warm-up period, cold starting, warming-up operating mode have also adopted air inlet LPG in early stage to spray.
Test shows, partial load condition is when air fuel ratio A/F＞60: 1 times work, and the fuel consumption rate of the more general premixed and homogenized combustion manner of the manner can reduce more than 10%.
Claims (5)
1. the firing chamber is made of the pit that ridge-roof type top and piston head have the large inclined angle bottom surface.Pit centres departs from cylinder-bore axis; And the pit axis of symmetry (bottommost) is along deflecting down 40 ° counterclockwise.
2. spark plug is arranged in the position of suitably leaving nozzle on the symmetrical line of two outlet valves; 3 hole nozzles are installed on the center, firing chamber, its axis rolls tiltedly to spark plug, make the compression process later stage form inflammable mixture near the part LPG of 2 holes on top ejection spraying directly arrives sparking-plug electrode.
3. the compression process later stage then arrives the pit with large inclined angle bottom surface from another part LPG of 1 hole of bottom ejection spraying, and is up along pocket wall under the effect of large inclined angle bottom surface and intake swirl, himself entrainment the whirlpool and will promote that also the LPG mixed gas moves to the spark plug electrode direction along what the pit wall formed.Intake swirl can also make the LPG spraying that sprays into pit keep relatively concentrated, is conducive to form the rich mixture zone.
4. close an intake valve during partial load condition, air-flow only enters cylinder by another intake valve, and then forms stronger intake swirl under the casing wall effect.And two intake valves are opened simultaneously during high load working condition, and spray with air inlet (70 ° of CA ATDC) LPG in early stage and to match, and form homogeneous charge in the cylinder.Also adopt air inlet LPG in early stage to spray when cold starting, warming-up operating mode.
5. the above-mentioned claim of the present invention also is applicable to gasoline-fueled same structure.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210099849.XA CN103362691B (en) | 2012-04-09 | 2012-04-09 | The mixed Daqu method of layering lean-burn spraying-wall compound guiding LPG in-cylinder direct injection supercharged engine |
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| CN201210099849.XA CN103362691B (en) | 2012-04-09 | 2012-04-09 | The mixed Daqu method of layering lean-burn spraying-wall compound guiding LPG in-cylinder direct injection supercharged engine |
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| CN103362691A true CN103362691A (en) | 2013-10-23 |
| CN103362691B CN103362691B (en) | 2015-12-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104791141A (en) * | 2015-03-16 | 2015-07-22 | 山东建筑大学 | Method for forming mixed gas for two-stroke LPG direct-injection engine achieving hierarchical lean combustion |
| CN108167101A (en) * | 2017-12-28 | 2018-06-15 | 沈阳航空航天大学 | A kind of air-fuel mixture quality optimization method of diesel engine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0941976A (en) * | 1995-07-31 | 1997-02-10 | Mitsubishi Motors Corp | Cylinder fuel injection type internal combustion engine |
| CN1193374A (en) * | 1996-03-19 | 1998-09-16 | 舷外发动机公司 | Two-stroke engine piston bowl configurations |
| JPH11210472A (en) * | 1998-01-28 | 1999-08-03 | Fuji Heavy Ind Ltd | Structure of combustion chamber in cylinder injection type spark ignition engine |
| US6092501A (en) * | 1997-05-20 | 2000-07-25 | Nissan Motor Co., Ltd. | Direct injection gasoline engine with stratified charge combustion and homogeneous charge combustion |
| 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 |
-
2012
- 2012-04-09 CN CN201210099849.XA patent/CN103362691B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0941976A (en) * | 1995-07-31 | 1997-02-10 | Mitsubishi Motors Corp | Cylinder fuel injection type internal combustion engine |
| CN1193374A (en) * | 1996-03-19 | 1998-09-16 | 舷外发动机公司 | Two-stroke engine piston bowl configurations |
| US6092501A (en) * | 1997-05-20 | 2000-07-25 | Nissan Motor Co., Ltd. | Direct injection gasoline engine with stratified charge combustion and homogeneous charge combustion |
| JPH11210472A (en) * | 1998-01-28 | 1999-08-03 | Fuji Heavy Ind Ltd | Structure of combustion chamber in cylinder injection type spark ignition 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104791141A (en) * | 2015-03-16 | 2015-07-22 | 山东建筑大学 | Method for forming mixed gas for two-stroke LPG direct-injection engine achieving hierarchical lean combustion |
| CN108167101A (en) * | 2017-12-28 | 2018-06-15 | 沈阳航空航天大学 | A kind of air-fuel mixture quality optimization method of diesel engine |
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