CN103557068A - Ultrahigh-supercharging turbo-charging Miller cycle engine - Google Patents
Ultrahigh-supercharging turbo-charging Miller cycle engine Download PDFInfo
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- CN103557068A CN103557068A CN201310506850.4A CN201310506850A CN103557068A CN 103557068 A CN103557068 A CN 103557068A CN 201310506850 A CN201310506850 A CN 201310506850A CN 103557068 A CN103557068 A CN 103557068A
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- cycle engine
- miller cycle
- turbine
- compression ratio
- supercharger
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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
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/32—Miller cycle
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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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Abstract
The invention discloses an ultrahigh-supercharging turbo-charging Miller cycle engine which comprises a turbocharger and a Miller cycle engine body. The supercharge ratio of the turbocharger can exceed 2.5, but the compression ratio of the Miller cycle engine body is as low as 4. A turbine in the turbocharger can absorb much power and is a variable turbine geometry (VTG) turbine. The turbocharger can be a centrifugal supercharger, or a roots pump supercharger or a rotor pump and provides the condition that heat work absorbed by the turbine is very close to releasable heat work contained in exhaust gas. The compression ratio of the Miller cycle engine body can be fixed or adjustable. When the Miller cycle engine with fixed compression ratio is adopted, the supercharger is a supercharger with fixed flow, such as a roots pump or a rotor pump. When the supercharger with the fixed flow is adopted, the VTG turbine is connected with a crankshaft of the Miller cycle engine through a transmission. The efficiency of an internal combustion engine is remarkably improved.
Description
Technical field
The present invention relates to a kind of turbosupercharging miller cycle engine of super high pressure-charging, utilize larger turbine to improve the ratio that absorbs hot merit from exhaust, thereby improve the thermal efficiency, form more high efficiency and high-power Atkinson cycle engine.
Background technique
Improving to improve the thermal efficiency of internal-combustion engine is the most important improvement design of internal-combustion engine.Use now the most general miller cycle engine can realize expansion ratio and surpass 1 Sydney Atkinson circulation, and manufacture in a large number, technology maturation, improves the thermal efficiency thereby can make high-temperature fuel gas fully expand.
But the specific power of miller cycle is very low, also lower than the four stroke engine of natural aspiration, thereby need to increase considerably its specific power.Centrifugal supercharger is a method being in daily use, but can change the overall compression ratio of motor, therefore often needs variable compression ratio engine to coordinate.Also can use Roots pump or rotor pump pressurized machine, gas flow is relatively fixing, thereby the overall compression ratio of motor is also fixing.But traditional engine driven supercharging is turbo-adding not, and the inertia of turbine-centrifugal supercharger is too large, therefore need better design proposal.
Publication number is high pressurized miller cycle dynamo and the controlling method thereof of CN101092893A, although utilize pressurized machine for miller cycle engine supercharging, but the pressure that the result of supercharging is exhaust has also increased, the hot merit of losing in exhaust process also increases, thereby decrease in efficiency, in fact namely be equivalent to quartastroke engine, so miller cycle engine is to be improved power and to be kept high efficiency by simple supercharging.
Summary of the invention
This patent is made new solution for above-mentioned defect, has designed a kind of turbosupercharging miller cycle engine of super high pressure-charging, comprises turbosupercharger and miller cycle engine, and the pressure ratio of turbosupercharger surpasses 2.5.And the compression ratio of miller cycle engine can be low to moderate 4.Turbine in turbosupercharger can absorb more power, and is variable-area turbine VTG; And pressurized machine can be centrifugal supercharger, or Roots pump pressurized machine, or rotor pump; And reach such condition: the hot merit that turbine absorbs approaches contained releasable hot merit in exhaust very much.Miller cycle engine can be fixing compression ratio, can be also adjustable compression ratio; When adopting the miller cycle engine of fixing compression ratio, the pressurized machine of the essential employing of pressurized machine firm discharge, for example Roots pump, or rotor pump.When adopting the pressurized machine of firm discharge, VTG turbine is connected with the bent axle of miller cycle engine by speed changer.When adopting mechanical supercharger, the bent axle of miller cycle engine is connected by speed changer with turbine; When adopting centrifugal supercharger, turbine is directly connected with pressurized machine.
Accompanying drawing explanation
Fig. 1 is the general illustration of the turbosupercharging miller cycle engine of super high pressure-charging, shows the structure characteristic of turbosupercharging miller cycle engine and the character of turbine of super high pressure-charging.
Fig. 2 is the scheme that the turbosupercharging miller cycle engine of super high pressure-charging is used turbine-centrifugal supercharger, and turbine-centrifugal supercharger is directly connected with axle, does not pass through bent axle.
Fig. 3 is the scheme that the turbosupercharging miller cycle engine of super high pressure-charging is used turbine-mechanical supercharger, and turbine all links bent axle by speed changer with mechanical supercharger.
Embodiment
The turbosupercharging miller cycle engine of described super high pressure-charging of the present invention can be with reference to figure 1.Air enters pressurized machine by suction tude 5, air after supercharging enters miller cycle engine through recent manifold 1, what miller cycle engine was discharged enters turbine with the waste gas of equal pressure by gas exhaust manifold 2 with intake manifold 1, and the waste gas after acting is discharged through outlet pipe 3.The mechanical work that turbine absorbs can directly offer pressurized machine by axle 4, or by axle 6, offers the bent axle of miller cycle engine.When using mechanical supercharger, miller cycle engine can pass through axle 7 driving device pressurized machines.Miller cycle engine cannot directly be used pressurized machine supercharging, otherwise its circulation has just become the Otto cycle of engine driven supercharging, but also wastes large energy, can not raise the efficiency.The turbine here, is not common turbine, but adjustable geometry turbine (VTG), common much bigger of for example turbosupercharger with variable turbine geometry described in People's Republic of China's patent publication No. CN101384807, and its power ratio.Common Otto engine adds turbosupercharging, its turbine can not absorb the hot merit of a lot of exhausts, otherwise according to energy conservation, turbine hyperabsorption hot merit will cause centrifugal supercharger rotating speed to improve, and increase air mass flow and pressure, cause the temperature and pressure of exhaust higher, form a positive feedback loop, finally cause the rotation of turbosupercharger hypervelocity, Otto engine compression ratio overrate, is a unsettled design.Therefore common turbosupercharged engine can not be energy-conservation the meaning of circulation, can only be to have increased specific power, reduced the heat diffusion area of motor and energy-conservation.And the turbine of the turbosupercharging miller cycle engine of super high pressure-charging can absorb the hot merit that can absorb in most exhaust, and this hot merit can not cause centrifugal supercharger hypervelocity, because master motor is miller cycle, absorbed the hot merit in a lot of exhausts, this is just few to leave hot merit that turbine absorbs for, because of but individual stable state.From energy conservation, turbine absorbs how much power, just passes to how much power of pressurized machine, can not surpass the needs of pressurized machine under rated condition, even slightly not enough, so just can not cause positive feedback to make rotating speed exceed standard.The principle on basis is exactly to improve the outlet of whole Miller engine and the air pressure of entrance, thereby improves its specific power, and fuel-economizing more.Here, adjustable geometry turbine (VTG) is crucial, because the ratio of specific heat that adds of air changes in motor, therefore the pressure of exhaust also changes, in order to allow the pressure energy of exhaust be able to abundant release, the essential adjustable geometry turbine (VTG) that adopts, could allow motor all have higher efficiency like this under all rotating speeds of all power.
Fig. 2 is the scheme that the turbosupercharging miller cycle engine of super high pressure-charging is used turbine-centrifugal supercharger, and turbine is directly connected with axle 4 with centrifugal supercharger, does not pass through bent axle.Other feature is common suction tude 5, recent manifold 1, gas exhaust manifold 2 and outlet pipe 3.Because it is approximate that variable-area amasss characteristic and the centrifugal compressor of turbine (VTG), therefore they are directly connected, benefit is simple in structure, does not need speed changer, thereby loss is less, efficiency is higher, structure is compacter.But the miller cycle engine here must be variable compression ratio, it is constant because the boost pressure of centrifugal supercharger does not increase with flow, can cause the variation of boost pressure, for guaranteeing that overall compression is than constant, the compression ratio of miller cycle engine must be stepless adjustable, not only very important for petrol engine, to prevent the generation of pinking, for diesel engine, be also that so during startup, centrifugal supercharger boost pressure is too low, can cause not ignitable fault.The miller cycle engine that how to build variable compression ratio utilizes common Otto engine to can be modified to miller cycle engine, the technology that common Otto engine is made into variable compression ratio is known technology, for example publication number is CN102297029A piston variable compression ratio device in internal-combustion engine, similar techniques is a lot, again publication number CN100470024C variable compression ratio internal combustion engine for example.Obviously, by changing the angle of cam and the design of driving mechanism, just can become miller cycle engine, belong to prior art.Certainly, according to prior art, centrifugal supercharger is to also having closure between miller cycle engine, and centrifugal supercharger also has the air duct that short circuit is used, and is controlled by air register, to realize power, controls.
Fig. 3 is the scheme that the turbosupercharging miller cycle engine of super high pressure-charging is used turbine-mechanical supercharger, and turbine is all connected bent axle by speed changer 8 with axle 6 with mechanical supercharger, and mechanical supercharger is to be connected with bent axle with axle 7 by speed changer 9.Mechanical supercharger can be Roots pump pressurized machine, or rotor pump pressurized machine, the pressurized machine of firm discharge in a word, be exactly no matter rotating speed is how many to advantage, total boost pressure approximate identical, so miller cycle engine does not need to change compression ratio, simpler, cost is lower, and mechanical supercharger generally efficiency higher than centrifugal supercharger, thereby use mechanical supercharger better from the angle of raising the efficiency.Other feature is common suction tude 5, recent manifold 1, gas exhaust manifold 2 and outlet pipe 3.
With regard to the general motor with pressurized machine, the intercooler equipment that is absolutely necessary, although do not describe in detail in the middle of the present invention, also should give and be included as the necessary equipment of supercharger systems.
Fig. 1, to this turbo charge system illustrated in fig. 3, not only can be used on miller cycle engine, on the full Overhead valve two stroke IC engine of multimode that also can circulate for application two-stroke Sydney Atkinson.
In general, the turbosupercharging miller cycle engine of super high pressure-charging is exactly to use larger variable geometry turbine VTG, hot merit in more as far as possible absorption exhausts, improve the intake and exhaust pressure of whole miller cycle engine, thereby improve the specific power of whole miller cycle engine, allow the more miller cycle engine of small displacement send larger power.The most of parts of the present invention and whole critical component, all from ready-made parts and motor, enter through minority and change, thereby with regard to whole design and production process, the present invention can reach the optimum balance of the efficiency of internal combustion engine and cost.
Above-mentioned narration is only used for explaining exemplary embodiments of the present invention, and it is not exclusive or the present invention is limited to concrete form disclosed with it.It will be understood by those skilled in the art that within not departing from scope of the present invention, can make various changes and element wherein can be replaced with IF-AND-ONLY-IF element.In addition, can make a lot of modifications so that particular condition or material are applicable to purport of the present invention and do not depart from essential scope.Therefore, the invention is not restricted to realize the disclosed specific embodiment of optimal mode of the present invention as design, but the present invention includes all mode of executions that belong to the scope of the invention.Without departing from the spirit and scope of the present invention, the present invention can implement in other modes beyond specific explanations and the mode of illustrating.
Claims (3)
1. a turbosupercharging miller cycle engine for super high pressure-charging, comprises turbosupercharger and miller cycle engine, and the pressure ratio of turbosupercharger surpasses 2.5, and the compression ratio of miller cycle engine can be low to moderate 4.Turbine in turbosupercharger can absorb more power, and is adjustable geometry turbine VTG; And pressurized machine can be centrifugal supercharger, or Roots pump pressurized machine, or rotor pump; And reach such condition: the hot merit that turbine absorbs approaches contained releasable hot merit in exhaust very much.
2. the turbosupercharging miller cycle engine of a kind of super high pressure-charging as claimed in claim 1, is further characterized in that its miller cycle engine can be fixing compression ratio, can be also adjustable compression ratio; When adopting the miller cycle engine of fixing compression ratio, the pressurized machine of the essential employing of pressurized machine firm discharge, for example Roots pump, or rotor pump; When adopting centrifugal supercharger, the essential stepless adjustable compression ratio of miller cycle engine.
3. the turbosupercharging miller cycle engine of a kind of super high pressure-charging as claimed in claim 1, is further characterized in that the bent axle of miller cycle engine is connected by speed changer with turbine when adopting mechanical supercharger; When adopting centrifugal supercharger, turbine is directly connected with pressurized machine.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310506850.4A CN103557068A (en) | 2013-10-24 | 2013-10-24 | Ultrahigh-supercharging turbo-charging Miller cycle engine |
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| CN201310506850.4A CN103557068A (en) | 2013-10-24 | 2013-10-24 | Ultrahigh-supercharging turbo-charging Miller cycle engine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103790695A (en) * | 2014-02-28 | 2014-05-14 | 朱譞晟 | Turbocharging and mechanical supercharging internal combustion engine with constant compression ratio |
| CN106257024A (en) * | 2015-06-22 | 2016-12-28 | 福特环球技术公司 | Engine exhaust temperature controls |
| WO2018195634A1 (en) * | 2017-04-26 | 2018-11-01 | Associação Paranaense De Cultura - Apc | Combined atkinson or miller and binary isothermal-adiabatic cycle engine and process for controlling the thermodynamic cycle of the combined cycle engine |
| WO2018195633A1 (en) * | 2017-04-26 | 2018-11-01 | Associação Paranaense De Cultura - Apc | Combined atkinson or miller and binary isobaric-adiabatic cycle engine and process for controlling the thermodynamic cycle of the combined cycle engine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001193468A (en) * | 2000-01-11 | 2001-07-17 | Osaka Gas Co Ltd | Miller cycle engine |
| CN101092893A (en) * | 2007-07-12 | 2007-12-26 | 奇瑞汽车有限公司 | High pressurized miller cycle dynamo and control method |
| CN102575589A (en) * | 2009-10-16 | 2012-07-11 | 三菱重工业株式会社 | Miller cycle engine |
| CN103147847A (en) * | 2011-12-07 | 2013-06-12 | 现代自动车株式会社 | Miller cycle engine system and control method thereof |
-
2013
- 2013-10-24 CN CN201310506850.4A patent/CN103557068A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001193468A (en) * | 2000-01-11 | 2001-07-17 | Osaka Gas Co Ltd | Miller cycle engine |
| CN101092893A (en) * | 2007-07-12 | 2007-12-26 | 奇瑞汽车有限公司 | High pressurized miller cycle dynamo and control method |
| CN102575589A (en) * | 2009-10-16 | 2012-07-11 | 三菱重工业株式会社 | Miller cycle engine |
| CN103147847A (en) * | 2011-12-07 | 2013-06-12 | 现代自动车株式会社 | Miller cycle engine system and control method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103790695A (en) * | 2014-02-28 | 2014-05-14 | 朱譞晟 | Turbocharging and mechanical supercharging internal combustion engine with constant compression ratio |
| CN106257024A (en) * | 2015-06-22 | 2016-12-28 | 福特环球技术公司 | Engine exhaust temperature controls |
| CN106257024B (en) * | 2015-06-22 | 2021-07-09 | 福特环球技术公司 | Engine exhaust temperature control |
| WO2018195634A1 (en) * | 2017-04-26 | 2018-11-01 | Associação Paranaense De Cultura - Apc | Combined atkinson or miller and binary isothermal-adiabatic cycle engine and process for controlling the thermodynamic cycle of the combined cycle engine |
| WO2018195633A1 (en) * | 2017-04-26 | 2018-11-01 | Associação Paranaense De Cultura - Apc | Combined atkinson or miller and binary isobaric-adiabatic cycle engine and process for controlling the thermodynamic cycle of the combined cycle engine |
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Application publication date: 20140205 |