CN103437897A - Atkinson cycle engine combustion system - Google Patents
Atkinson cycle engine combustion system Download PDFInfo
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- CN103437897A CN103437897A CN2013103609040A CN201310360904A CN103437897A CN 103437897 A CN103437897 A CN 103437897A CN 2013103609040 A CN2013103609040 A CN 2013103609040A CN 201310360904 A CN201310360904 A CN 201310360904A CN 103437897 A CN103437897 A CN 103437897A
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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
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The invention discloses an Atkinson cycle engine combustion system which comprises a cylinder cover and a piston. The design that the compression ratio of the piston is within the range from 4 to 12 is met, a top face of the piston is designed to be of a protruding structure, and the central area of the top face is designed to be in a concave spherical structure. Lift ranges of an exhaust valve, a first intake valve and a second intake valve are non-variable-valve lift ranges. The valve motion of the first intake valve and the valve motion of the second intake valve are driven by the same mechanism, the motion curves of the first intake valve and the second intake valve are not symmetrical and form an oblique axis vortex, the first intake valve and the second intake valve respectively comprises the lift range and a phase, vortex motion is formed in the air inside the cylinder due to the asymmetrical phase design, the asymmetrical design is combined with tumble and vortex and forms oblique axis vortex, and form much stronger turbulent motion at the ignition moment, and therefore the combustion efficiency is improved. According to the Atkinson cycle engine combustion system, on the premise that an original cylinder cover is not changed, due to the reasonable design of the valve motion and a combustion chamber, the combustion efficiency of the Atkinson cycle engine can be improved, therefore, a part of load oil consumption is reduced, and the low-speed torque is improved. The Atkinson cycle engine combustion system has the advantages of being simple in structure and easy to implement.
Description
Technical field
The present invention relates to field of internal combustion engine, be specifically related to Sydney Atkinson circulating combustion system and structural design.
Background technique
Along with hybrid vehicle becomes the focus of the future development of automobile industry, the lower powered Sydney Atkinson recycle gasoline of high thermal efficiency machine becomes the study hotspot of each Automobile Enterprises again.Sydney Atkinson recycle gasoline machine is applied in hybrid vehicle, when engine power is not enough, adopt the motor power-assisted, thereby reduced the power demand of car load to motor, therefore when the Atkinson cycle engine of exploitation hybrid vehicle application, more focus on the low oil consumption under the sub load of motor, and the power at a high speed can suitably be sacrificed.
The Sydney Atkinson recycle gasoline machine of applying in current hybrid vehicle is all to utilize the mode of high compression ratio, intake valve pass in evening to realize that effective expansion ratio is greater than effective compression ratio, and the pinking of high load is avoided in the oil consumption while reducing sub load simultaneously.In order to realize generalization, generally, when exploitation Sydney Atkinson recycle gasoline machine, the cylinder block and head of foundation machine is not changed, and the flat-top projection by piston head realizes high compression ratio, and the characteristics of motion by the change valve control machanism realizes intake valve pass in evening.Yet there is following problem in this design: the modern gasoline machine is generally pursued at a high speed lower high-power, adopts symmetric double intake duct structure and symmetrical valve motion rule more, and Design of Inlet is that high mass capture ratio hangs down and rolls the stream coefficient.When carrying out the exploitation of Sydney Atkinson recycle gasoline machine, cylinder cover structure is not changed, and the Tumble intensity that the intake duct guiding forms is difficult to improve; Adopt in addition the strategy of intake valve pass in evening due to Sydney Atkinson recycle gasoline machine, in-cylinder tumble flow intensity further weakens, and makes burning slower, and the thermal efficiency descends, the phenomenon of even catching fire when serious; The flat-top projection of the piston head designed because of high compression ratio can further affect mixture combustion in cylinder, and under low speed high load, tendency to detonate is serious, causes the low speed torque deterioration.Therefore, effectively improving flowing state in cylinder is the key that realizes the burning of Atkinson cycle engine stability and high efficiency, reduces the sub load oil consumption.
Summary of the invention
The present invention proposes a kind of efficient Sydney Atkinson circulating combustion system, purpose is the design by combustion system, improve the combustion stability of mixed gas in the Atkinson cycle engine cylinder in the mode of " asymmetric air inlet is flowed " and " concave spherical surface firing chamber ", improve combustion efficiency, improve fuel economy and the low speed torque of motor.
The technical solution used in the present invention is as follows:
A kind of combustion system of Atkinson cycle engine, comprise cylinder cap and piston, and the design of piston meets compression ratio between 12 ~ 14, and piston-top surface is designed to raised structures, and the end face center region is designed to the concave spherical surface shape; On described cylinder cap, design the first intake duct and the second intake duct and at least one air outlet flue, be designed with the first intake valve, the second intake valve and at least one exhaust valve on described cylinder cap; A set of cam control gear at least is set takes independent or dependent driving to control to exhaust valve, the first intake valve and the second intake valve; The lift of described exhaust valve, the first intake valve and the second intake valve is non-lift range variable.
The valve motion of described the first intake valve and the second intake valve is driven by same mechanism, and Motion curves is asymmetric, comprise lift and phase place, asymmetric Signal Phase Design makes gas in the jar form eddy motion, asymmetrical design combines rolls stream and eddy current, form inclined-axis swirl, at time of ignition, form stronger turbulent motion, thereby improve combustion efficiency.
Further, in described two intake valves, one of them intake valve lift is designed to high lift, and another intake valve lift is designed to low lift; Two IO Intake Valve Opens phase place differences, the air inlet duration is identical or different.The intake valve Motion curves of high lift keeps original flow system, and the intake valve Motion curves of low lift more is conducive to the formation of in-cylinder tumble flow.
The present invention, under the prerequisite that does not change original cylinder cap, by the appropriate design of valve motion and firing chamber, realizes by the valve motion rule that changes the two intake valves of motor the asymmetry that gas in the jar is mobile; By the design of piston head projection concave spherical surface, the burning adverse effect of having avoided Sydney Atkinson circulation high compression ratio to bring.Compare with currently available technology, can improve the combustion efficiency of Atkinson cycle engine, and then reduce the sub load oil consumption, promote low speed torque.That the present invention has is simple in structure, the characteristics of easy realization.
The accompanying drawing explanation
Fig. 1 (a) is structural representation of the present invention;
Fig. 1 (b) is the plan view of piston head concrete structure shape;
Fig. 1 (c) is firing chamber of the present invention concrete structure worm's eye view;
Fig. 2 is the cam profile schematic diagram of air inlet driving cam structure;
Fig. 3 is inlet and exhaust valve characteristics of motion curve synoptic diagram.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, design for piston (8), under the prerequisite of not changing cylinder cap and cylinder body, the design piston meets compression ratio between 12 ~ 14, piston-top surface is designed to raised structures, piston (8) end face center region is designed to the concave spherical surface shape, avoids the high compression ratio raised structures to rolling stream and flame propagation adverse influence.
Further, the lift of exhaust valve (5), the first intake valve (6) and the second intake valve (7) is non-lift range variable; Described intake valve 1(6) and intake valve 2(7) valve motion driven by same mechanism, and Motion curves is designed to asymmetric design, comprises lift and phase place; One of them intake valve lift is designed to high lift, and another intake valve lift is designed to low lift; Two IO Intake Valve Opens phase place differences, the air inlet duration can be identical or different;
As shown in Figure 1, the Sydney Atkinson circulatory system comprises cylinder cap (1) and piston (8).At the upper design of cylinder cap (1) at least one air outlet flue (2), the first intake duct (3) and the second intake duct (4), described cylinder cap (1) at least arranges a set of cam control gear, at least comprises an exhaust valve (5), the first intake valve (6) and the second intake valve (7).Exhaust valve (5), the first intake valve (6) and the second intake valve (7) can adopt independent or dependent driving control mode.
As shown in Figure 1, the first intake duct (3) on piston (8) and cylinder cap (1), the second intake duct (4), air outlet flue (2) are the important component parts of combustion system, in order to realize the high compression ratio of Sydney Atkinson circulation, under the prerequisite of not doing to change in the combustion chamber, piston (8) adopts raised structures, be designed to concave spherical surface shape (8-1) in piston (8) center region, spherical radius can be designed to 1 ~ 4 times of cylinder diameter, as shown in Fig. 1 (b), thereby avoided the piston head raised structures to rolling the adverse effect of stream and burning.In addition, the appropriate design of concave spherical surface, not only can avoid flame to encounter the piston head projection and produce extinguishing, and form maximum turbulence intensity in cylinder, more is conducive to the fast propagation of flame, thereby effectively avoids the pinking under high load.
As shown in Figure 2, to retain original straight air flue constant for the first intake duct (3) and the second intake duct (4).General intake and exhaust valve adopts the actuated by cams form, remains unchanged.The first intake valve (3) and the second intake valve (4) they are upper two the different actuated by cams of same camshaft (9), the stroke difference of two cams, and α means the phase difference phase place difference of two intake cams.Be subject to shaft-driven the first intake valve of intake cam (3) different with the characteristics of motion of the second intake valve (4), be respectively the height lifting curve, as shown in Figure 3.The first intake valve (3) is the high lift Motion curves, still can keep high mass capture ratio, the power under being conducive to keep at a high speed; The second intake valve (4) is low lift Motion curves, Tumble intensity in lift cylinder, and can promote the charging efficiency under low speed; Simultaneously, design the first intake valve (3) different with the open phase of the second intake valve (4), as shown in Figure 2, during one-sided IO Intake Valve Opens, can not only can increase the Tumble intensity of air flue, also can form eddy current in cylinder, roll stream and be combined into inclined-axis swirl with eddy current, form stronger turbulent flow near the piston top dead center time of ignition, can shorten the flame propagation time, improving combustion efficiency, and the reduction tendency to detonate, not only be conducive to the sub load oil consumption, also help the moment of torsion under low speed.
The above has carried out the example description to the present invention by reference to the accompanying drawings, and the implementation of patent of the present invention is not subject to the restriction of aforesaid way, as long as adopted design or the scheme of this patent, without improving or having carried out various improvement, all within protection scope of the present invention.
Claims (3)
1. the combustion system of an Atkinson cycle engine, comprise cylinder cap (1) and piston (8), the design that it is characterized in that piston (8) meets compression ratio between 12 ~ 14, and piston-top surface is designed to raised structures, and the end face center region is designed to concave spherical surface shape (8-1); Described cylinder cap (1) upper design the first intake duct (3) and the second intake duct (4) and at least one air outlet flue (2), the first intake duct (3) and the second intake duct (4) they are straight air flue; Be designed with the first intake valve (6), the second intake valve (7) and at least one exhaust valve (5) on described cylinder cap (1); A set of cam control gear at least is set takes independent or dependent driving to control to exhaust valve (5), the first intake valve (6) and the second intake valve (7); The lift of described exhaust valve (5), the first intake valve (6) and the second intake valve (7) is non-lift range variable; Upper two the different actuated by cams of the same camshaft of valve motion (9) of described the first intake valve (6) and the second intake valve (7), and Motion curves is asymmetric, comprises lift and phase place.
2. the combustion system of Atkinson cycle engine according to claim 1, it is characterized in that: in described two intake valves, one of them intake valve lift is designed to high lift, and another intake valve lift is designed to low lift; Two IO Intake Valve Opens phase place differences, the air inlet duration is identical or different.
3. the combustion system of Atkinson cycle engine according to claim 1 and 2 is characterized in that: the spherical radius of the concave spherical surface of piston (8) is cylinder diameter 1 ~ 4 times.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310360904.0A CN103437897B (en) | 2013-08-19 | 2013-08-19 | A kind of Atkinson cycle engine combustion system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310360904.0A CN103437897B (en) | 2013-08-19 | 2013-08-19 | A kind of Atkinson cycle engine combustion system |
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| CN103437897A true CN103437897A (en) | 2013-12-11 |
| CN103437897B CN103437897B (en) | 2015-11-18 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108915914A (en) * | 2018-06-20 | 2018-11-30 | 柳州五菱柳机动力有限公司 | A kind of natural aspiration gasoline engine Atkinson cycle implementation method |
| CN112081693A (en) * | 2020-09-15 | 2020-12-15 | 奇瑞汽车股份有限公司 | Miller cycle gasoline engine |
| CN115182825A (en) * | 2022-08-22 | 2022-10-14 | 浙江吉利控股集团有限公司 | Methanol engine and vehicle |
Citations (5)
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| JPS59136515A (en) * | 1983-10-13 | 1984-08-06 | Honda Motor Co Ltd | Three-valve type internal-combustion engine |
| JPS61205326A (en) * | 1985-03-06 | 1986-09-11 | Nissan Motor Co Ltd | Intake device of internal-combustion 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 |
| CN202451292U (en) * | 2012-02-16 | 2012-09-26 | 重庆长安汽车股份有限公司 | Engine piston for Atkinson cycle |
| CN102762841A (en) * | 2009-11-05 | 2012-10-31 | 丰田自动车株式会社 | Intake apparatus of engine |
-
2013
- 2013-08-19 CN CN201310360904.0A patent/CN103437897B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59136515A (en) * | 1983-10-13 | 1984-08-06 | Honda Motor Co Ltd | Three-valve type internal-combustion engine |
| JPS61205326A (en) * | 1985-03-06 | 1986-09-11 | Nissan Motor Co Ltd | Intake device of internal-combustion 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 |
| CN102762841A (en) * | 2009-11-05 | 2012-10-31 | 丰田自动车株式会社 | Intake apparatus of engine |
| CN202451292U (en) * | 2012-02-16 | 2012-09-26 | 重庆长安汽车股份有限公司 | Engine piston for Atkinson cycle |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108915914A (en) * | 2018-06-20 | 2018-11-30 | 柳州五菱柳机动力有限公司 | A kind of natural aspiration gasoline engine Atkinson cycle implementation method |
| CN108915914B (en) * | 2018-06-20 | 2021-05-11 | 柳州五菱柳机动力有限公司 | Atkinson cycle implementation method for natural aspiration gasoline engine |
| CN112081693A (en) * | 2020-09-15 | 2020-12-15 | 奇瑞汽车股份有限公司 | Miller cycle gasoline engine |
| CN112081693B (en) * | 2020-09-15 | 2021-12-28 | 奇瑞汽车股份有限公司 | Miller cycle gasoline engine |
| CN115182825A (en) * | 2022-08-22 | 2022-10-14 | 浙江吉利控股集团有限公司 | Methanol engine and vehicle |
| CN115182825B (en) * | 2022-08-22 | 2024-01-09 | 浙江吉利控股集团有限公司 | Methanol engine and vehicle |
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| CN103437897B (en) | 2015-11-18 |
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