CN105370383A - High-low zoning and layering lean burn engine combustion chamber structure - Google Patents
High-low zoning and layering lean burn engine combustion chamber structure Download PDFInfo
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- CN105370383A CN105370383A CN201510633510.7A CN201510633510A CN105370383A CN 105370383 A CN105370383 A CN 105370383A CN 201510633510 A CN201510633510 A CN 201510633510A CN 105370383 A CN105370383 A CN 105370383A
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- combustion
- dividing plate
- piston
- subregion dividing
- chamber structure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B17/00—Engines characterised by means for effecting stratification of charge in cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/26—Pistons having combustion chamber in piston head
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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
Abstract
The invention discloses a high-low zoning and layering lean burn engine combustion chamber structure. The high-low zoning and layering lean burn engine combustion chamber structure comprises an air cylinder and a piston connected into the air cylinder for acting. A piston top zoning partition plate is arranged on the top of the piston. An air cylinder cover zoning partition plate and the piston top zoning partition plate are arranged in a staggered manner and partition a combustion chamber into a small combustion zone and a large combustion zone. When the piston moves to a top dead center, the air cylinder cover zoning partition plate and the piston top zoning partition plate are tightly attached together; the top of the large combustion zone is higher than the top of the small combustion zone, and therefore the top of the large combustion zone and the top of the small combustion zone form a step shape; and the overall high-low zoning and layering lean burn engine combustion chamber structure is in the step shape corresponding to steps, and protrusions are arranged between the large combustion zone and the small combustion zone. The combustion efficiency of fuel oil inside an engine is improved when an automobile is in the idling and small-load state, and exhaust gas and consumed oil of the engine are lowered, so that the environmental-protection performance of the automobile during running is improved, and the using cost is lowered.
Description
Technical field
The present invention relates to technical field of engines, particularly relate to a kind of height Sub-region and hierarchical lean combustion engine chamber structure.
Background technique
At present, motor car engine mostly is reciprocating-piston engine, reciprocating-piston engine automobile is applied maximum motors, but have the following disadvantages: (1) is at the complete close the throttle of idling, very little air is only had to enter cylinder by closure idling passage, make to form very large degree of vacuum during air-breathing, the energy that air inlet will inevitably be made to consume increases, and increases pumping loss; Degree of vacuum simultaneously due to now suction tude is very large, when IO Intake Valve Opens, pressure in cylinder is higher than suction press, waste expansion enters suction tude, and when suction stroke, these waste gas and new mixed gas suck cylinder simultaneously, in order to ensure this mixed gas energy normal combustion crossed through exhaust gas dilution, just must supply more fuel oil, air-fuel mixture enrichment, must oil consumption be increased; (2) when Smaller load, the aperture of closure is very little, make to form larger degree of vacuum during air-breathing, when IO Intake Valve Opens, the pressure in cylinder higher than suction press, when suction stroke, there is portion to expand equally and enter suction tude, in order to ensure this mixed gas energy normal combustion crossed through exhaust gas dilution, more fuel oil to be supplied equally, increasing oil consumption; (3) its mixed gas of uniform-charge Otto-engine is homogeneous, generally at air fuel ratio 12 ~ 17 operated within range, in order to prevent detonation, can only adopt lower compression ratio, causing the thermal efficiency lower; (4) adopt suction tude throttle style to the adjustment of the carbureted charge amount of carrying out, make pumping loss comparatively large, burn near stoichiometric proportion, make NOx emission higher.
Number of patent application is 201410700632.9, name is called a kind of Sub-region and hierarchical lean combustion engine chamber structure, disclose and a kind ofly comprise cylinder and be connected to the piston of acting in cylinder, cylinder is connected to the cylinder head of its tip position, cylinder head is provided with cylinder head subregion dividing plate, the tip position of piston is provided with piston head subregion dividing plate, and cylinder head subregion dividing plate and piston head subregion dividing plate are staggered setting, and combustion chamber isolated are become little zone of combustion and large-scale combustion district; When piston movement is to top dead center, cylinder head subregion dividing plate and piston head subregion dividing plate are close together.This engine combustion chamber structure achieves motor when auto idle speed, Smaller load, improves the combustion efficiency of fuel oil in motor, reduces waste gas and the oil consumption of motor eliminating, thus improves automobile environmental-protecting performance in motion and reduce its user cost.
But the problems referred to above 1-4 can not get sufficient solution.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of height Sub-region and hierarchical lean combustion engine chamber structure, its object is to realize motor when auto idle speed, Smaller load, improve the combustion efficiency of fuel oil in motor, reduce waste gas and the oil consumption of motor eliminating, thus improve automobile environmental-protecting performance in motion and reduce its user cost.
The technical solution adopted in the present invention is: a kind of height Sub-region and hierarchical lean combustion engine chamber structure, comprise cylinder and be connected to the piston of acting in cylinder, cylinder is connected to the cylinder head of its tip position, cylinder head is provided with cylinder head subregion dividing plate, the tip position of piston is provided with piston head subregion dividing plate, cylinder head subregion dividing plate and piston head subregion dividing plate are staggered setting, and combustion chamber isolated are become little zone of combustion and large-scale combustion district; When piston movement is to top dead center, cylinder head subregion dividing plate and piston head subregion dividing plate are close together; Firing chamber is provided with at top, large-scale combustion district respectively: intake valve I, exhaust valve I, large spark plug I; Firing chamber is provided with at top, little zone of combustion respectively: intake valve II, exhaust valve II, spark plug II; The top in large-scale combustion district higher than the top of little zone of combustion, thus makes the top of the top in large-scale combustion district and little zone of combustion form step shape; And piston head subregion dividing plate is overall also in the step shape corresponding with above-mentioned step, and it is provided with projection between large-scale combustion district and little zone of combustion.
Further improvement of the present invention is, cylinder head subregion dividing plate bilateral is respectively arranged with spherical arc; Two spherical arcs of the cylinder head of cylinder and piston and piston head subregion dividing plate, projection surround the two and half large and small zone of combustion of rugby shape.
Further improvement of the present invention is, is also provided with piston ring between piston head subregion dividing plate and piston, and the shape of piston ring and the shape of piston head subregion dividing plate adapt.
Further improvement of the present invention is, the top in large-scale combustion district exceeds the top 1-5cm of little zone of combustion.
Further improvement of the present invention is, the top in large-scale combustion district exceeds the top 2cm of little zone of combustion.
Further improvement of the present invention is, the height of the projection of piston head subregion dividing plate is 0.2-0.8cm.
Further improvement of the present invention is, keeps the gap of 0.5 ~ 1.0mm between the projection of cylinder head subregion dividing plate and piston head subregion dividing plate.
Further improvement of the present invention is, protruding curved towards the two ends, side in large-scale combustion district, and its another side and cylinder head subregion dividing plate suitable.
Further improvement of the present invention is, the volume ratio of large-scale combustion district and little zone of combustion is 51:49 to 70:30.
Further improvement of the present invention is, the volume ratio of large-scale combustion district and little zone of combustion is 65:35.
Compared with prior art, the invention has the beneficial effects as follows: 1. when idling, Smaller load, moderate duty, owing to being only use one of them zone of combustion to work, this work zone of combustion and another zone of combustion that do not work are separated, and work zone of combustion volume is little, burns in the deadline from lighting a fire to, the heat produced can make gas only expand in little volume zone of combustion, therefore greatly higher than the pressure of conventional engines, the rate of pressure rise improves greatly, and hot merit conversion ratio is improved a lot;
2, when idling, Smaller load, moderate duty, the acting that misfires zone of combustion is filled with is waste gas, even if be in high temperature in cylinder, also not easily make these waste gas produce NOx again, greatly reduce the discharge of dusty gas than other lean-combustion engine;
3, piston up carry out compression stroke time, the squish face of cylinder head, between the subregion dividing plate of cylinder head and piston head, a squish effect can be formed, all form the gas flow of some strength in large-scale combustion district and little zone of combustion, form rapid combustion, reduce octane number requirement;
4, this motor is the improvement on existing four-valve engine mature technology, and therefore research and development experimentation cost is low, and fund input is few, and development risk is little.
A kind of height Sub-region and hierarchical lean combustion engine chamber structure of the present invention, achieve motor improves fuel oil in motor combustion efficiency when auto idle speed, Smaller load, reduce waste gas and the oil consumption of motor eliminating, thus improve automobile environmental-protecting performance in motion and decrease its user cost.
Accompanying drawing explanation
Fig. 1 is the organigram of an embodiment of engine cylinder inner carrier of the present invention structure and cylinder head;
Fig. 2 is the organigram of piston in the embodiment of Fig. 1 and piston ring;
Fig. 3 is the organigram that the inside of cylinder head in the embodiment of Fig. 1 is provided with an embodiment of cylinder head subregion dividing plate;
Fig. 4 is the schematic diagram that the inside of engine cylinder cover in the embodiment of Fig. 1 is provided with an embodiment of the squish stream of squish face and formation;
Fig. 5 is the engine controlling unit schematic diagram using chamber structure of the present invention;
Fig. 6 forms four strands when being and using the suction stroke of the motor of chamber structure of the present invention and rolls flow diagram;
Various stratification of hot gas schematic diagram when Fig. 7 is the little zone of combustion suction inflammable mixture using the motor of chamber structure of the present invention;
The layering schematic diagram of gas with various when Fig. 8 is little zone of combustion work when using the compression stroke of the motor of chamber structure of the present invention to complete;
Various stratification of hot gas schematic diagram when Fig. 9 is the large-scale combustion district suction inflammable mixture of the embodiment of Fig. 1;
The layering schematic diagram of gas with various when Figure 10 is large-scale combustion district work when using the compression stroke of the motor of chamber structure of the present invention to complete;
Figure 11 is various stratification of hot gas schematic diagram when using the large and small zone of combustion of the motor of chamber structure of the present invention to suck inflammable mixture;
In figure: 1. cylinder head, 2. cylinder head subregion dividing plate, 201. spherical arcs, 3. piston ring, 4. intake valve I, 5. exhaust valve I, 6, spark plug I, 410. intake valve II, 510. exhaust valve II, 610. spark plug II, 7. piston, 8. piston head subregion dividing plate, 81. is protruding, 9. little zone of combustion, the top of 901. little zone of combustion, 10. large-scale combustion district, the top in 101. large-scale combustion districts, 102. squish are protruding, the squish face of 11. cylinder heads, 12. waste gas reservoir vessels, 13. air inlets, 14. gas cleaners, 15. throttle bodies, 16. closures, 17. exhaust gas recirculation pipes, 18. air inlet conversion valves I, 19. air intake ducts, 20. cylinder intake pipes, 21. oil sprayers I, 22. cylinder intake pipes divide guidance tape, 23. large intake ducts, 24. little intake ducts, 25. inflammable mixtures roll stream, 26. air roll stream, 27 waste gas roll stream, 28. electronic control units (also claiming ECU), 29. control valves, 30. air-fuel mixture, squish air-flow in 31. large-scale combustion districts, squish air-flow in 32. little zone of combustion, 38. air inlet conversion valves II, 41. oil sprayer II, 110. electromagnetic controller, 113. outlet port, 141. air-strainer, 161. throttle body.
Embodiment
In order to deepen the understanding of the present invention, below in conjunction with drawings and Examples, the present invention is further described, and this embodiment, only for explaining the present invention, not forming protection scope of the present invention and limiting.
A kind of height Sub-region and hierarchical lean combustion engine chamber structure, comprise cylinder 42 and be connected to the piston 7 of acting in cylinder 42, cylinder 42 is connected to the cylinder head 1 of its tip position, cylinder head 1 is provided with cylinder head subregion dividing plate 2, the tip position of piston 7 is provided with piston head subregion dividing plate 8, cylinder head subregion dividing plate 2 and piston head subregion dividing plate 8 are staggered setting, and combustion chamber isolated are become little zone of combustion 9 and large-scale combustion district 10; When piston 7 moves to top dead center, cylinder head subregion dividing plate 2 and piston head subregion dividing plate 8 are close together; Firing chamber is provided with at top, large-scale combustion district respectively: intake valve I 4, exhaust valve I 5, large spark plug I 6; Firing chamber is provided with at top, little zone of combustion respectively: intake valve II 410, exhaust valve II 510, spark plug II 610; The top 101 in large-scale combustion district higher than the top 901 of little zone of combustion, thus makes the top 101 in large-scale combustion district and the top 901 of little zone of combustion form step shape;
And piston head subregion dividing plate 8 entirety is also in the step shape corresponding with above-mentioned step, and it is provided with protruding 81 between large-scale combustion district 10 and little zone of combustion 9.
In the above-described embodiments, cylinder head subregion dividing plate 2 bilateral is respectively arranged with spherical arc 201; Two spherical arcs 201 of the cylinder head 1 of cylinder 42 surround the two and half large and small zone of combustion 10,9 of rugby shape with piston 7 and piston head subregion dividing plate 8, protruding 81.
In the above-described embodiments, be also provided with piston ring 3 between piston head subregion dividing plate 8 and piston 7, the shape of piston ring 3 and the shape of piston head subregion dividing plate 8 adapt.
In the above-described embodiments, the top 901 that the top 101 in large-scale combustion district exceeds little zone of combustion is 1-5cm, and preferably distance is 2cm.
In the above-described embodiments, the height of the projection 81 of piston head subregion dividing plate 8 is 0.2-0.8cm.
In the above-described embodiments, the gap of 0.5 ~ 1.0mm is kept between the projection 81 of cylinder head subregion dividing plate 2 and piston head subregion dividing plate.
In the above-described embodiments, protruding 81 curved towards the two ends, side in large-scale combustion district, and its another side and cylinder head subregion dividing plate 2 suitable.
In the above-described embodiments, the volume ratio of large-scale combustion district 10 and little zone of combustion 9 is 51:49 to 70:30.Good volume ratio is 65:35.
Embodiment is described in detail referring now to accompanying drawing:
As shown in Figure 1, there is a cylinder head subregion dividing plate 2 inside, hemispherical combustion chamber of the cylinder head 1 of this motor, firing chamber is divided into two and half rugby shape zone of combustion by it, one of them is little zone of combustion 9, its volume accounts for 35% of combustion chamber of air cylinder's total measurement (volume), another is large-scale combustion district 10, and its volume accounts for 65% of combustion chamber of air cylinder's total measurement (volume), the upper top height of cylinder head is different, and the top in large-scale combustion district exceeds the top of little zone of combustion, exceeds about 2 centimetres, suitable piston top corresponding to cylinder head has piston head subregion dividing plate 8 and piston head subregion dividing plate projection 81, and protruding height equals firing chamber height, is approximately 0.3-0.8 centimetre, when piston stroking upward completes compression stroke, piston head subregion dividing plate 8 and piston head subregion dividing plate protruding 81 fit with cylinder head subregion dividing plate 2 back side, make large-scale combustion district and little zone of combustion completely isolated, in order to ensure when piston stroking upward, cylinder head subregion dividing plate 2 can not collide with piston head subregion dividing plate 8 and piston head subregion dividing plate projection 81, add man-hour, make the gap keeping about 0.5 ~ 1.0mm between two dividing plates, when doing work in large-scale combustion district, spark plug premature ignition, define large-scale combustion district pressure to increase, piston head subregion dividing plate projection 81 has a deformation, close to cylinder head subregion dividing plate 2, this gap is reduced to 0, piston head subregion dividing plate protruding 81 is fitted just with cylinder head subregion dividing plate 2 back side, form good compartmentation, the top that described piston 7 is in large-scale combustion district differs certain height with the top being in little zone of combustion, the tip position of described piston 7 is provided with piston head subregion dividing plate 8, and described piston head subregion dividing plate 8 is provided with protruding 81 between large-scale combustion district 10 and little zone of combustion 9, therefore deformation 0.5 ~ 1.0mm size of producing of the thickness of piston head subregion dividing plate 81 and pressure is suitable, piston-top surface of the present invention forms height step shape, and the piston-top surface in large-scale combustion district exceeds about 1.5-2 centimetre, the relatively low 1.5-2 centimetre of piston-top surface of little zone of combustion, and therefore, the large-scale combustion district of formation exceeds about 1.5-2 centimetre than little zone of combustion, this design can make the expansion stroke stage that piston is reaching budc 2.0-2.5 centimetre of compression stroke stage and atdc 2.0-2.5 centimetre all realize subregion, that is: top dead center precontract 45 ° of crank angle ~ atdc about 45 ° of crank angles realize subregion, two objects can be reached: (1) is when when idling or Smaller load, little zone of combustion is only used to work, the fuel oil spraying into little zone of combustion has little time to be diffused into large-scale combustion district and is just isolated in little zone of combustion, plug ignition, burning is only carried out in little zone of combustion, with in-cylinder direct injection layering lean combustion, there is same effect, equally, if when middle load, only use the work of large-scale combustion district, the fuel oil spraying into large-scale combustion district has little time to be diffused into little zone of combustion and is just isolated in large-scale combustion district, plug ignition, burning is only carried out in large-scale combustion district, also reaches the effect same with in-cylinder direct injection layering lean combustion, (2) after having burnt, gas starts expansion work, still subregion is in the working stroke stage in early stage of this motor " top dead center " 2.5 ㎝ afterwards, gas in the zone of combustion of work can not expand and flow to another zone of combustion, therefore, it is possible to keep very large pressure in this zone of combustion long period, hot merit conversion ratio is improved greatly, thus reduces oil consumption.
As shown in Figure 2, the piston head of this motor is provided with a piston head subregion dividing plate 8 and piston head subregion dividing plate projection 81, the height of this piston head subregion dividing plate projection 81 is approximately 0.3-0.8 centimetre, and its two ends, side towards large-scale combustion district are curved, another side and cylinder head subregion dividing plate 2 suitable, when compression stroke completes, large-scale combustion district can be made to be half rugby shape; This piston head is high low platform scalariform state, and the part being in large-scale combustion district will exceed about 2 centimetres; The piston ring 3 of this piston is also bent upwards along with exceeding of piston top, and the part avoiding piston to exceed exists more gas with cylinder inner wall gap place.
As shown in Figure 3, this cylinder head is distributed with 4 valves, intake valve 4 and the exhaust valve I 5 in large-scale combustion district are relatively large, intake valve II 410 and exhaust valve II 510 relatively little, their size dimension be suitable for mutually with the air inflow of large-scale combustion district 65% and little zone of combustion 35% respectively; This cylinder head is distributed with 2 spark plugs, spark plug I 6 is between the intake valve 4 and exhaust valve I 5 in large-scale combustion district, spark plug II 610 is between intake valve II 410 and exhaust valve II 510, when only having large-scale combustion district to work, spark plug I 6 is lighted a fire, inflammable mixture in large-scale combustion district is lighted, and at this time little zone of combustion does not work, and therefore spark plug II 610 misfires; When only having little zone of combustion to work, spark plug II 610 is lighted a fire, and the inflammable mixture in little zone of combustion is lighted, and at this time large-scale combustion district does not work, and therefore spark plug I 6 misfires; When large-scale combustion district and little zone of combustion all work, spark plug I 6 and spark plug II 610 are all lighted a fire; Have cylinder head subregion dividing plate 2 in this cylinder head, its two ends are curved, make large-scale combustion district in half larger rugby shape, make little zone of combustion in half less rugby shape; When motor is in idling, Smaller load and moderate duty, this motor only has the work of zone of combustion, compares the motor of equal discharge capacity, the combustion chamber surface to volume ratio of this motor is less, advantage that firing chamber is compacter, and therefore hot merit conversion ratio will be higher.
As shown in Figure 4, the squish face 11 of a cylinder head is had in the internal structure of this engine cylinder cover, when piston carries out compression stroke close to top dead center, squish is formed between piston head and this squish face 11, form the squish air-flow 31 in large-scale combustion district, this squish air-flow 31 flows through the position residing for spark plug, then forms two eddy current in large-scale combustion district, accelerate the flame propagation in large-scale combustion district 10, form rapid combustion; Meanwhile, also squish air-flow 32 is formed between piston head and cylinder head subregion dividing plate 2, the width of cylinder head subregion dividing plate 2 is as the criterion to form appropriate air-flow size, and this squish air-flow 32 of formation can accelerate the flame propagation in little zone of combustion 9, forms rapid combustion; Therefore two subregion rapid combustions of this motor are more confidential than conventional engine a lot of soon, can reduce ignition advance angle, reduce negative work and reduce oil consumption, and all right increasing compression ratio is to about 13 simultaneously, can not produce detonation.
As shown in Figure 5, before the outlet port 113 of this motor, be provided with an exhaust vent control valve 29, it by electromagnetic controller 110 control waste gas discharge number, make some exhaust gas thus flows backwards to waste gas reservoir vessel 12, this waste gas reservoir vessel is provided with cooling system, is cooled by waste gas, and the density of waste gas is increased close to air density, electromagnetic controller 110 is controlled by ECU28, the operating mode instruction electromagnetic controller 110 that ECU28 is according to motor makes exhaust vent control valve 29 be in different apertures, the waste gas being back to waste gas reservoir vessel 12 is varied in size, when motor is in idling and Smaller load, the aperture of exhaust vent control valve 29 reduces, the waste gas of backflow is increased, when being in moderate duty, the aperture of exhaust vent control valve 29 increases, the waste gas of backflow is reduced, time when motor is in large load and at full capacity, the aperture of exhaust vent control valve 29 reaches maximum, the waste gas of backflow is made to be reduced to 0, waste gas is all discharged, waste gas in waste gas reservoir vessel 12 is back to the idle zone of combustion of cylinder when idling, Smaller load, moderate duty, improve the charge of whole cylinder, when motor is in idling and Smaller load, little zone of combustion work by combustion, what be filled with is inflammable mixture, do not burn and do not do work in large-scale combustion district, what be filled with is waste gas, when motor is in moderate duty, large-scale combustion district work by combustion, what be filled with is inflammable mixture, does not burn and do not do work in little zone of combustion, and what be filled with is waste gas, when motor be in large load and at full capacity time, large and small zone of combustion all work by combustion, what be filled with is all inflammable mixture, arrive throttle body 15 through the chilled waste gas of waste gas reservoir vessel 12 again by gas cleaner 14, reach air inlet conversion valve 18 through exhaust gas recirculation pipe 17, air enters through air inlet 13, more also arrives air inlet conversion valve 18 respectively through air-strainer 141, throttle body 161 and air intake duct 19, air inlet conversion valve 18 controls by ECU28, when motor is in idling and Smaller load, ECU28 makes air inlet conversion valve I 18 open air intake duct 19 by electromagnetic controller, close exhaust gas recirculation pipe 17 simultaneously, meanwhile air inlet conversion valve II 38 exhaust gas recirculation pipe 17, close air intake duct 19 simultaneously, like this, what enter little zone of combustion 9 is fresh air, and oil sprayer I 21 oil spout forms inflammable mixture, what enter large-scale combustion district 10 is waste gas, oil sprayer II 41 not oil spout, and therefore, when idling and Smaller load, what will enter next step acting only has little zone of combustion, oil sprayer I 21 and oil sprayer II 41 all control by ECU28, when motor is in moderate duty, ECU28 makes air inlet conversion valve I 18 open exhaust gas recirculation pipe 17 by electromagnetic controller, close air intake duct 19 simultaneously, meanwhile air inlet conversion valve II 38 opens the air intake duct 19 be communicated with large-scale combustion district 10, close the exhaust gas recirculation pipe 17 be communicated with large-scale combustion district simultaneously, like this, what enter little zone of combustion 9 is waste gas, oil sprayer I 21 not oil spout, what enter large-scale combustion district 10 is fresh air, and oil sprayer II 41 oil spout forms inflammable mixture, and therefore, when moderate duty, what will enter next step acting only has large-scale combustion district, when motor be in large load and at full capacity time, ECU28 makes air inlet conversion valve I 18 and air inlet conversion valve II 38 open air intake duct 19 by electromagnetic controller, simultaneously all closes exhaust gas recirculation pipe 17, what entered two zone of combustion like this is all fresh air, two oil sprayers all oil spout formation inflammable mixtures, and time therefore at large load and at full capacity, two zone of combustion all will enter next step and do work.Can find out that this motor is in idling from the above, when Smaller load and moderate duty, some zone of combustion are only used to work, another zone of combustion is filled with waste gas, relative conventional engines has following advantage: (1) only uses some zone of combustion, regional space is relatively little, the air quantity of the inside is relatively less, therefore the fuel oil of seldom amount is only needed just can to reach the concentration of igniting, reach the object of fuel-economizing, particularly when idling and Smaller load, do not need this motor of concentration increasing fuel oil can realize stable ignition yet, also the economic air fuel ratio smooth combustion of 16-17 can be realized in little zone of combustion, therefore oil-saving effect is more obvious, (2) another idle zone of combustion is filled with waste gas, therefore the method taking to reduce throttle opening is not needed to reduce cylinder charge, suitably can tune up closure idling passage and intake valve aperture, whole cylinder charge is increased, both pumping loss can be reduced, suitably improve air fuel ratio again, improve hot merit conversion ratio, (3) only have some zone of combustion to work and produce waste gas, the waste gas therefore got rid of is fewer than conventional engines a lot.
As shown in Figure 6, cylinder intake pipe divides guidance tape 22 to be divided into entering pipe the intake duct varied in size, and intake duct 24 is less, and intake duct 23 is comparatively large, and the upside of intake duct 23 is provided with oil sprayer, the fuel oil sprayed into only with the gas and vapor permeation of large intake duct; The gas entering cylinder is divided into four strands and independently rolls stream; It is comparatively large that two of two limits roll stream, and middle two to roll stream less; Independently roll stream and can form layering preferably, effectively suppress the phase interdiffusion of different air-flow; When engine idle or small load condition, descent of piston air-breathing, what enter zone of combustion under cylinder is air, and oil sprayer 21 sprays fuel oil, and the stream 25 that rolls of formation is inflammable mixture, inflammable mixture represents with " ", rolling stream 26 is the air not having fuel oil, represents by "○", and what enter large-scale combustion district is waste gas, represent by "×", the stream 27 that rolls of formation is that waste gas rolls stream.
As shown in Figure 7, the distribution situation of heterogeneity gas during expression suction stroke, what Fig. 7 represented is when motor is in idling, oil sprayer 21 oil spout, form inflammable mixture after mixing with the air of large intake duct 23 li and roll stream 25, represent with " ", inflammable mixture enters little zone of combustion 9, entering 24 from little intake duct in addition, what enter is that air rolls stream 24, represent by "○", what enter large-scale combustion district 10 is that waste gas rolls stream 27, represent by "×", because the temperature of waste gas is slightly higher than air, therefore in compression process, waste gas pressure increases faster than air, small part waste gas can be caused to cross piston head dividing plate 8 and to enter little zone of combustion, the air mixed distribution entered with small airway 24 is in the lower left corner of little zone of combustion, the benefit forming such distribution of gas is: can realize stratified mixture combustion, and waste gas can be allowed again to suppress to produce the reaction of NOx, decreasing pollution gas purging, because the reaction producing NOx is a reversible reaction, containing certain density NOx in waste gas, the positive reaction producing NOx can be suppressed, in addition: being filled with the whole of large-scale combustion district is recirculating exhaust gas, and therefore the waste gas produced than traditional lean combustion engine greatly reduces by this motor, greatly can exceed discharging standards, be the desirable motor of a environmental protection.
As shown in Figure 8, the projection 81 of cylinder head subregion dividing plate 2 and piston head subregion dividing plate 8 is engaged completely when top dead center, form little zone of combustion 9 and large-scale combustion district 10, when idling and Smaller load, the gas in little zone of combustion has: (1) inflammable mixture, represent with " ", (2) air, represents by "○", (3) waste gas, represent by "×", they are layer distributed in little zone of combustion; At this moment be all waste gas in large-scale combustion district; The compartmentation of two dividing plates terminates to atdc about 45 ° of crank angles from top dead center precontract 45 ° of crank angles; According to engine combustion situation, general beginning when budc 15 ° of crank angles is lighted a fire, mixture combustion Before Bottom Dead Center 20 ° of crank angles time terminate, therefore the subregion effect of this motor fully ensure that and realizes subregion at main combustion period, ensure that Sub-region and hierarchical burns; Certainly, subregion stroke is longer, and splitting time is longer, and oil consumption is lower, because: the time that the rate of pressure rise of work zone of combustion keeps is longer, and hot merit conversion ratio will be higher, and fuel economy is also better.
As shown in Figure 9, what represent is motor when being in moderate duty, and what large-scale combustion district entered is fresh air, oil sprayer 41 oil spout, inflammable mixture 25 is formed after fuel oil mixes with air in large intake duct 23, represent with " ", this inflammable mixture enters large-scale combustion district 10, and entering 24 from little intake duct is in addition air 26, represent by "○", what enter little zone of combustion 9 is useless 27, by "×", represents; Because the temperature of waste gas is slightly higher than air, therefore in compression process, waste gas pressure increases faster than air, and small part waste gas can be caused to cross piston head dividing plate 8 and enter little zone of combustion, the air mixed distribution entered with small airway 24 is in the lower left corner of little zone of combustion; The benefit forming such distribution of gas is: can realize stratified mixture combustion, and waste gas can be allowed again to suppress to produce the reaction of NOx, decreasing pollution gas purging.
As shown in Figure 10, illustrate when moderate duty, when compression stroke completes: the projection 81 of cylinder head subregion dividing plate 2 and piston head subregion dividing plate 8 is engaged completely when top dead center, forms little zone of combustion 9 and large-scale combustion district 10, when moderate duty, gas in large-scale combustion district has: (1) inflammable mixture, represents with " ", (2) air, represent by "○", (3) waste gas, represents by "×", and they are layer distributed in large-scale combustion district; When spark plug is in budc igniting (premature ignition), initiation combustion makes the pressure in large-scale combustion district be greater than the pressure of little zone of combustion, some deformation can be there are in piston head subregion dividing plate projection 81, draw close to fitting completely to cylinder head subregion dividing plate, large and small zone of combustion is made to realize separating completely, at this moment the rate of pressure rise that large-scale combustion district burning produces improves greatly, and hot merit conversion ratio is improved a lot.At this moment be filled with in little zone of combustion whole be backflow waste gas, decrease the discharge of waste gas.
As shown in figure 11, represent be motor be in large load and at full capacity time, oil sprayer 22 and oil sprayer 41 all oil spouts, form inflammable mixture 25 after fuel oil mixes with air in large intake duct 23, represent with " ", inflammable mixture 25 enters large-scale combustion district 10 and little zone of combustion 9 respectively, what enter from little intake duct 24 is air 26, represent by "○", air and inflammable mixture layer distributed, realize stratified mixture combustion after compression.
A kind of height Sub-region and hierarchical lean combustion engine chamber structure of the present invention, achieve motor improves fuel oil in motor combustion efficiency when auto idle speed, Smaller load, reduce waste gas and the oil consumption of motor eliminating, thus improve automobile environmental-protecting performance in motion and decrease its user cost.
What embodiments of the invention were announced is preferred embodiment, but is not limited thereto, those of ordinary skill in the art; very easily according to above-described embodiment, understand spirit of the present invention, and make different amplifications and change; but only otherwise depart from spirit of the present invention, all in protection scope of the present invention.
Claims (10)
1. a height Sub-region and hierarchical lean combustion engine chamber structure, comprise cylinder (42) and be connected to the piston (7) of acting in cylinder (42), described cylinder (42) is connected to the cylinder head (1) of its tip position, it is characterized in that:
Described cylinder head (1) is provided with cylinder head subregion dividing plate (2), the tip position of described piston (7) is provided with piston head subregion dividing plate (8), described cylinder head subregion dividing plate (2) and piston head subregion dividing plate (8) are staggered setting, and combustion chamber isolated are become little zone of combustion (9) and large-scale combustion district (10);
When piston (7) moves to top dead center, described cylinder head subregion dividing plate (2) and piston head subregion dividing plate (8) are close together;
Described firing chamber is provided with at top, large-scale combustion district respectively: intake valve I (4), exhaust valve I (5), large spark plug I (6);
Described firing chamber is provided with at top, little zone of combustion respectively: intake valve II (410), exhaust valve II (510), spark plug II (610);
The top (101) in described large-scale combustion district higher than the top (901) of little zone of combustion, thus makes the top (101) in described large-scale combustion district and the top (901) of little zone of combustion form step shape;
And described piston head subregion dividing plate (8) is overall also in the step shape corresponding with above-mentioned step, and it is provided with projection (81) between described large-scale combustion district (10) and little zone of combustion (9).
2. a kind of height Sub-region and hierarchical lean combustion engine chamber structure according to claim 1, is characterized in that: described cylinder head subregion dividing plate (2) bilateral is respectively arranged with spherical arc (201); Two spherical arcs (201) of the cylinder head (1) of described cylinder (42) surround the two and half large and small zone of combustion of rugby shape (10,9) with piston (7) and piston head subregion dividing plate (8), projection (81).
3. a kind of height Sub-region and hierarchical lean combustion engine chamber structure according to claim 1 and 2, it is characterized in that: be also provided with piston ring (3) between described piston head subregion dividing plate (8) and piston (7), the shape of described piston ring (3) and the shape of piston head subregion dividing plate (8) adapt.
4. a kind of height Sub-region and hierarchical lean combustion engine chamber structure according to claim 1, is characterized in that: the top (101) in described large-scale combustion district exceeds top (901) 1-5cm of little zone of combustion.
5. a kind of height Sub-region and hierarchical lean combustion engine chamber structure according to claim 4, is characterized in that: the top (101) in described large-scale combustion district exceeds top (901) 2cm of little zone of combustion.
6. a kind of height Sub-region and hierarchical lean combustion engine chamber structure according to claim 2, is characterized in that: the height of the projection (81) of described piston head subregion dividing plate (8) is 0.2-0.8cm.
7. a kind of height Sub-region and hierarchical lean combustion engine chamber structure according to claim 2, is characterized in that: the gap keeping 0.5 ~ 1.0mm between the projection (81) of described cylinder head subregion dividing plate (2) and piston head subregion dividing plate.
8. a kind of height Sub-region and hierarchical lean combustion engine chamber structure according to claim 1 or 2 or 6 or 7, it is characterized in that: described projection (81) is curved towards the two ends, side in large-scale combustion district, and its another side and cylinder head subregion dividing plate (2) suitable.
9. a kind of height Sub-region and hierarchical lean combustion engine chamber structure according to claim 1, is characterized in that: the volume ratio of described large-scale combustion district (10) and little zone of combustion (9) is 51:49 to 70:30.
10. a kind of height Sub-region and hierarchical lean combustion engine chamber structure according to claim 8, is characterized in that: the volume ratio of described large-scale combustion district (10) and little zone of combustion (9) is 65:35.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107387241A (en) * | 2017-08-31 | 2017-11-24 | 汪辉 | Engine |
| CN113107698A (en) * | 2021-05-07 | 2021-07-13 | 东风柳州汽车有限公司 | Internal combustion engine |
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| CN113107698A (en) * | 2021-05-07 | 2021-07-13 | 东风柳州汽车有限公司 | Internal combustion engine |
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Application publication date: 20160302 |