CN105888832B - Miller cycle diesel oil-natural gas double fuel engine and its control method - Google Patents

Miller cycle diesel oil-natural gas double fuel engine and its control method Download PDF

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Publication number
CN105888832B
CN105888832B CN201610389615.7A CN201610389615A CN105888832B CN 105888832 B CN105888832 B CN 105888832B CN 201610389615 A CN201610389615 A CN 201610389615A CN 105888832 B CN105888832 B CN 105888832B
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engine
fuel
valve
diesel oil
air inlet
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CN105888832A (en
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高莹
刘洪岐
麻斌
徐英健
李君�
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Jilin University
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Jilin University
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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
    • F02B69/00—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types
    • F02B69/02—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel
    • F02B69/04—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel for gaseous and non-gaseous fuels
    • 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
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
    • F02B37/183—Arrangements of bypass valves or actuators therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/0223—Variable control of the intake valves only
    • F02D13/0226—Variable control of the intake valves only changing valve lift or valve lift and timing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/401—Controlling injection timing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/402—Multiple injections
    • F02D41/403—Multiple injections with pilot injections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D2013/0292—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation in the start-up phase, e.g. for warming-up cold engine or catalyst
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F02D2041/001—Controlling intake air for engines with variable valve actuation
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Supercharger (AREA)

Abstract

A kind of Miller cycle Diesel-CNG dual fuel engine and its control method, are related to technical field of engines.The present invention realizes the mode that inlet valve early closes, changes compression ratio by adjusting air inlet valving mechanisms, compression ratio and expansion ratio are separated, is conducive to cool down gaseous mixture, reduces engine heat load, expansion process, which generates positive suction work(, improves the thermal efficiency of engine, preferably improves fuel economy.And new control method is used, by making the more flexible conversion for carrying out high/low compression ratio of the present invention, makes Diesel-CNG dual fuel engine can efficient combustion operating in the range of full load.

Description

Miller cycle diesel oil-natural gas double fuel engine and its control method
Technical field
The invention belongs to technical field of engines, and in particular to a kind of Miller cycle diesel oil-natural gas double fuel engine and Its control method.
Background technology
Due to the fast development of modern industry, conventional automotive fuels price is constantly soaring, engine emission standard increasingly Strictly, development cleaning, economic gas engine increasingly cause social concern, become using natural gas as engine fuel The hot spot of research institution of various countries research.But natural gas engine is in use there are power drop is serious, course continuation mileage is short, The problems such as needing the aerating website of connection and reasonable arrangement, and conventional diesel engine torque is big, power is sufficient, course continuation mileage is long.Therefore, both at home and abroad It is a kind of by conventional fuel oil increase course continuation mileage that research is endeavoured always, and combines double combustions of the economy, the feature of environmental protection of gaseous fuel Expect engine；In order to solve the problems, such as that greatly, effective compression ratio regulation technology becomes using compression ratio variation during two kinds of different fuels Realize the key of dual fuel engine.
In prior art, Application No. 01823015.6, the patent of invention of entitled " dual fuel engine ", are to start Compression ratio control valve on machine cylinder head is set, when combustion gas operates, the control valve is opened at compression initial stage, part is released and has been enter into gas The gas mixture of cylinder reduces actual compression ratio.The mechanism of the control compression ratio can only open after lower dead center, Er Qie Push generates pumping loss.The compression ratio adjustment mechanism changes conventional engines big, realization method difficulty.
Miller cycle technological core is to separate compression ratio and expansion ratio, improves thermal efficiency reduction using high expansion ratio and arrange Temperature degree, while low effective compression ratio can prevent pinking.When engine gas operates, to avoid pinking that compression ratio to be made to be less than Di Sai Er engines, engine efficiency and power drop are serious.Early being closed using Miller cycle intake valve makes compression ratio and expansion score From when the combustion mode of low temperature supercharging can not only realize the double fuel operating of engine but also can be effectively improved combustion gas operating The performance of engine.
The content of the invention
The present invention is formed in view of the foregoing, and problem to be solved is：Limited for natural gas engine by gas station, The problems such as course continuation mileage is short solves the deficiency of existing dual fuel engine realization method and performance, provides a kind of realization method letter Single, economic and environment-friendly, the advantages that thermic load low durability is good Miller cycle diesel oil-natural gas double fuel engine.
To achieve the above object, the present invention proposes a kind of Miller cycle diesel oil-natural gas double fuel engine, by living Plug, cylinder, combustion chamber, compressor, turbine, exhaust gas by-pass valve, exhaust outlet, air bleeding valve, diesel oil regulating valve, fuel pressure sensing Device, fuel temperature sensor, combustion gas quality flow sensor, gas supply valve, air inlet pressure sensor, air inlet, intake valve, Fuel injector, air inlet valving mechanisms, fuel tank, load signal, tach signal, engine supervisory system, electronic control unit, storage Gas tank, gaseous-pressure sensor, charge air cooler and air cleaner composition.
Engine cylinder, which covers, is provided with intake valve, air bleeding valve, and air inlet valving mechanisms are arranged in the intake valve side on cylinder cap；
The engine supervisory system, including：Engine rotational speed signal, the engine being arranged in the engine body Load signal, air inlet pressure sensor, combustion gas quality sensor, fuel pressure transmitter, fuel temperature sensor, gaseous-pressure Sensor monitors the working condition of the engine and exports the information monitored to the electronic control unit in real time；
The electronic control unit receives the output information of each system of engine, analyzes and processes after the information to engine Perform structure output actuating signal；
The Fuel switching system according to the actuating signal of the electronic control system, is selectively opened or closed The control valve of fuel gas supply system realizes engine gas operating or diesel oil operating；
The air inlet valving mechanisms, according to the close moment of Miller cycle control principle, selectively operation intake valve；
It is characterized in that, the engine supervisory system is connected with electronic control unit, further at inlet valve Possess combustion gas quality flow sensor, possess pressure sensor at air inlet, possessing on fuel pipe has fuel pressure transmitter And fuel temperature sensor, electronic control unit are the input terminal of the sensor signal.
Another object of the present invention is just to provide a kind of controlling party of Miller cycle diesel oil-natural gas double fuel engine Method makes dual fuel engine can efficient combustion operating in the range of full load.
To realize foregoing invention mesh, the present invention proposes a kind of Miller cycle diesel oil-natural gas double fuel engine control Method：
Under diesel oil operation mode, electronic control unit control gas supply valve is closed, and engine enters full diesel fuel mode, The high temperature compressed air of the compressor supply of booster enters combustion chamber after air cleaner, charge air cooler by air inlet, is pressing The latter stage fuel oil of indention journey enters fuel injector from fuel tank through fuel pipe, sprays into diesel oil by fuel injector, intake valve makes at this time Engine works under valve timing, and engine actual compression ratio is equal to expansion ratio, and fuel oil carries out the combustion of high compression ratio precombustion Burning mode.
When combustion gas operates, electronic control unit controls the emitted dose of diesel oil according to combustion gas quality, diesel oil regulating valve；At this time A small amount of diesel oil of injection is only used for the gas compressed fuel mixture that ignites after compression ignition.Air inlet valving mechanisms, it is corresponding When the startup of engine, underload pass through shoulder load to high load capacity, intake valve close moment is adjusted, in startup, underload Using high compression ratio, low compression ratio is used in middle high load capacity.
Above-mentioned intake valve close moment is arranged on a certain moment before piston arrival lower dead center in suction stroke.It is high effectively Intake valve is set during compression ratio and early closes moment postponement, inlet period is long；Intake valve is set during low effective compression ratio, and early the pass moment carries Before, inlet period is short.
The present invention has the following advantages and beneficial effect compared with prior art：When using different fuel, change compression ratio Mode it is flexibly simple；The control method that intake valve early closes separates compression ratio and expansion ratio, and low effective compression ratio makes gas Fuel mixture undergoes an expansion process before compression travel, and internal cooling is carried out to gaseous mixture, reduces engine thermal Load.Meanwhile above-mentioned expansion process generates positive suction work(improves the thermal efficiency of engine.Utilize the height of Miller cycle strategy Expansion ratio, which improves the thermal efficiency, reduces delivery temperature, and engine heat load low durability is good.
Description of the drawings
Fig. 1 is Miller cycle diesel oil-natural gas double fuel engine structure diagram.
Fig. 2 is Miller cycle P-V figures.
Specific embodiment
Illustrate embodiments of the present invention referring to the drawings.
Diesel oil of the present invention-natural gas double fuel engine main body primary structure includes 1. pistons；2. cylinder；3. combustion chamber； 4. compressor；5. turbine；6. exhaust gas by-pass valve；7. exhaust outlet；8. air bleeding valve；9. diesel oil regulating valve；10. fuel pressure senses Device；11. fuel temperature sensor；12. combustion gas quality flow sensor；13. gas supply valve；14. air inlet pressure sensor； 15. air inlet；16. intake valve；17. fuel injector；18. air inlet valving mechanisms；19. fuel tank；20. load signal；21. rotating speed Signal；22. engine supervisory system；23. electronic control unit；24. air accumulator；25 gaseous-pressure sensors；26. charge air cooler； 27. air cleaner.
In the cylinder 2 of engine, possesses the piston 1 that moves back and forth and in the upper surface of piston 1 and cylinder cover Inner surface between form combustion chamber 3, air inlet 15 and exhaust outlet 7 are connected with the combustion chamber 3, be also equipped with carrying out air inlet 15 The intake valve 16 of opening and closing, the air bleeding valve 8 that exhaust outlet 7 is opened and closed；Air inlet valving mechanisms 18 are provided on cylinder cap, with electronics Control unit 23 is connected.
Engine supervisory system 22 as engine rotational speed signal 21 and the input terminal of load signal 20, monitors in real time The working condition of engine, and send monitoring signals to electronic control unit 23；Electronic control unit 23 is by engine speed With load value as detection signal, by controlling the opening and closing of gas supply valve 13, combustion gas operating or diesel operating are realized.
Electronic control unit 23 receives the pressure signal of air inlet pressure sensor 14, according to the operating condition of engine, adjusts The aperture of the exhaust gas by-pass valve 6 of whole booster 5 changes the admission pressure at air inlet 15.
When diesel oil operates, electronic control unit 23 controls gas supply valve 13 to close, and electronic control unit 23 is according to combustion The signal of oil pressure force snesor 10, fuel temperature sensor 11, the aperture of control diesel oil regulating valve 9 make engine enter full diesel oil Pattern, the compressed air that the compression unit 4 of booster 5 supplies enter combustion chamber 3 by air inlet 15, lead in the latter stage of compression travel It crosses fuel injector 17 and sprays into diesel oil, intake valve 16 makes engine work under valve timing at this time, and engine actual compression ratio is equal to Expansion ratio, fuel oil carry out high compression ratio precombustion mode and burn.
When combustion gas operates, gas supply valve 13 is opened, and gaseous fuel enters air inlet by air accumulator 24 through gas supply valve 13 Mouth 15；Fuel gas is mixed with the compressed air supplied from compressed portion 4, is entered after premixing by intake valve 16 and burnt Room 3；The combustion gas quality flow sensor 12 being arranged in fuel gas pipeline is input to electronic control unit 23, electronics by signal is detected Control unit 23 sends the aperture of control command adjustment diesel oil regulating valve 9, sprays a small amount of diesel compression and catch fire according to combustion gas quality After ignite gas compressed fuel mixture.
When supply stroke starts, electronic control unit 23 controls air inlet according to the pressure signal of air inlet pressure sensor 14 Valving mechanisms 18 close a certain moment of the intake valve 16 before piston 1 reaches lower dead center；
In starting and the underload of combustion gas operating, setting intake valve 16 is short at the time of early closing, and inlet period is long, setting The compression ratio of gaseous mixture is high, realizes the steady running of engine.
In the high load capacity of combustion gas operating, the 16 early pass moment of setting intake valve shifts to an earlier date, and inlet period is shorter, sets gaseous mixture Compression ratio it is low.Engine from underload by shoulder load increase to high load capacity when, with the increase of load, intake valve 16 is closed Moment gradually shifts to an earlier date, and control compression ratio slowly reduces.
Fig. 2 show the P-V figures for the Miller cycle that intake valve 16 is closed in advance；
Intake valve 16 top dead centre 28 front opening, piston 1 at 28 position of top dead centre downlink, come downwards to lower dead center During a certain position 29 before, intake valve 16 is closed；Piston 1 is continued traveling downwardly to lower dead center, and gas in the jar is undergone after point 29 Then one isentropic expansion process point of arrival 30 completes a working cycles through overcompression, acting, expansion stroke；Intake process The isentropic expansion process of middle experience is equivalent to and internal cooling has been carried out to air inlet, and entire working cycles carry out at relatively low temperature, Inhibit pinking tendency during combustion gas operating effective compression ratio raising.
When carrying out supply pressurization raising output power and the thermal efficiency by booster, by suction stroke a and instroke d shapes Into the suction work(of positive amount of work that shows of clockwise enclosed area (dash area in Fig. 2) shape coupled engines, The thermal efficiency of engine can be improved.

Claims (1)

1. a kind of control method of Miller cycle diesel oil-natural gas double fuel engine, it is characterised in that comprise the following steps:
1) electronic control unit (23) receives gaseous-pressure sensor (25) signal that engine supervisory system (22) gathers, control The opening and closing of gas supply valve (13)；
2) when gas supply valve (13) is opened, engine enters combustion gas operation mode, and electronic control unit (23) is according to engine Tach signal (21) that monitoring system (22) gathers in real time, load signal (20), control air inlet valving mechanisms (18), make air inlet A certain moment of the valve (16) before piston (1) reaches lower dead center closes；
3) in startup, underload using high compression ratio, at the time of air inlet valving mechanisms (18) set intake valve (16) morning pass Short, inlet period is long,
In the high load capacity of combustion gas operating, air inlet valving mechanisms (18) use low compression ratio, when setting intake valve (16) early closes Quarter shifts to an earlier date, and inlet period is shorter；
4) combustion gas quality flow sensor (12) signal that electronic control unit (23) is gathered according to monitoring system (22) controls bavin The aperture of oily regulating valve (9) sprays a small amount of diesel oil for the gas compressed fuel mixture that ignites after compression ignition；
5) when gas supply valve (13) is closed, engine enters full diesel fuel mode, electronic control unit (23) control intake valve tune Mechanism (18) is saved, intake valve (16) is made to work under valve timing；
6) electronic control unit is according to fuel pressure transmitter (10), signal, the load signal of fuel temperature sensor (11) (20), tach signal (21), the aperture of control diesel oil regulating valve (9)；
7) compressed air is sprayed by air inlet (15) into combustion chamber (3) in the latter stage of compression travel by fuel injector (17) Diesel oil.
CN201610389615.7A 2016-06-05 2016-06-05 Miller cycle diesel oil-natural gas double fuel engine and its control method Active CN105888832B (en)

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CN106523166B (en) * 2016-10-20 2019-06-11 哈尔滨工程大学 LNG dual fuel engine bypass complementary combustion pressure charging system and its control method
JP6666232B2 (en) * 2016-11-15 2020-03-13 日立オートモティブシステムズ株式会社 Variable system for internal combustion engine and control method thereof
DE102017004425B4 (en) * 2017-05-08 2019-03-14 Mtu Friedrichshafen Gmbh Method for operating a reciprocating engine
DE102017122117A1 (en) * 2017-09-25 2019-03-28 Man Diesel & Turbo Se Injector for a dual-fuel engine and dual-fuel engine
CN108798874B (en) * 2018-07-23 2023-09-22 吉林大学 Multi-cylinder miller cycle engine collaborative air inlet energy-saving device and control method thereof
CN109723547B (en) * 2019-01-30 2023-08-15 一汽解放汽车有限公司 Flexible fuel engine and control method
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CN113202628A (en) * 2021-06-02 2021-08-03 北京理工大学 Two-stage low-compression-cycle implementation method, device and detection method

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DE102014006802A1 (en) * 2013-05-09 2014-11-13 Caterpillar Inc. Dual fuel engine diagnostic system and method of operation
CN105275527A (en) * 2014-05-27 2016-01-27 卡特彼勒公司 Intake Valve Closure Control for Dual-Fuel Engines
CN204572179U (en) * 2015-04-20 2015-08-19 吉林大学 The diesel/natural gas dual-fuel engine that ignition mode is variable
DE102015211168A1 (en) * 2015-06-17 2016-03-24 Mtu Friedrichshafen Gmbh Method for operating an internal combustion engine and internal combustion engine
CN205154394U (en) * 2015-09-16 2016-04-13 吉林大学 Formula internal -combustion engine is lighted to gaseous double fuel of lean -burn based on EGR system
CN205190067U (en) * 2015-12-11 2016-04-27 吉林大学 Compound variable EGR air intake system of double fuel internal -combustion engine that sprays
CN105464847A (en) * 2016-01-15 2016-04-06 吉林大学 EGR system suitable for dual-fuel engine
CN205936844U (en) * 2016-06-05 2017-02-08 吉林大学 Miller cycle diesel oil natural gas dual -fuel engine

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