WO2013153842A1 - 2サイクルガスエンジン - Google Patents
2サイクルガスエンジン Download PDFInfo
- Publication number
- WO2013153842A1 WO2013153842A1 PCT/JP2013/052934 JP2013052934W WO2013153842A1 WO 2013153842 A1 WO2013153842 A1 WO 2013153842A1 JP 2013052934 W JP2013052934 W JP 2013052934W WO 2013153842 A1 WO2013153842 A1 WO 2013153842A1
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- WIPO (PCT)
- Prior art keywords
- combustion chamber
- fuel gas
- fuel
- piston
- dead center
- Prior art date
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Classifications
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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
- F02B19/00—Engines characterised by precombustion chambers
- F02B19/10—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder
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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
- F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
- F02B25/02—Engines characterised by using fresh charge for scavenging cylinders using unidirectional scavenging
- F02B25/04—Engines having ports both in cylinder head and in cylinder wall near bottom of piston stroke
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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
- F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
- F02B25/02—Engines characterised by using fresh charge for scavenging cylinders using unidirectional scavenging
- F02B25/04—Engines having ports both in cylinder head and in cylinder wall near bottom of piston stroke
- F02B25/06—Engines having ports both in cylinder head and in cylinder wall near bottom of piston stroke the cylinder-head ports being controlled by working pistons, e.g. by sleeve-shaped extensions thereof
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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
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
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- 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
- F02D19/08—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 simultaneously using pluralities of fuels
- F02D19/10—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 simultaneously using pluralities of fuels peculiar to compression-ignition engines in which the main fuel is gaseous
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
- F02D37/02—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for one of the functions being ignition
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- 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
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0284—Arrangement of multiple injectors or fuel-air mixers per combustion chamber
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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
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2400/00—Control systems adapted for specific engine types; Special features of engine control systems not otherwise provided for; Power supply, connectors or cabling for engine control systems
- F02D2400/04—Two-stroke combustion engines with electronic control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/1015—Air intakes; Induction systems characterised by the engine type
- F02M35/1019—Two-stroke engines; Reverse-flow scavenged or cross scavenged engines
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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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- 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
-
- 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
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to a two-stroke gas engine.
- a fuel gas such as natural gas is used as a main fuel
- a fuel oil such as light oil having a good compression ignition property is used as a pilot fuel
- the fuel oil is injected into a combustion chamber under a high temperature atmosphere to self-ignite.
- Gas engines are known which burn certain fuel gases.
- a dual fuel engine capable of arbitrarily switching between a gas operation mode in which the fuel gas is burned to operate the engine and a diesel operation mode in which the fuel oil is burned to operate the engine are also known.
- Patent Document 1 discloses a binary fueled diesel engine in which a low cetane number fuel having poor compression ignition properties such as fuel gas is used as a main fuel and a fuel oil having good compression ignition properties is used as a pilot fuel.
- the engine of this patent document 1 is provided with a fuel gas injection valve and a pilot fuel injection valve provided in a cylinder head, and the fuel gas and pilot fuel are directed from the fuel gas injection valve and the pilot fuel injection valve to the combustion chamber.
- the pilot fuel fuel oil
- the main fuel fuel gas
- Patent Document 2 discloses a gas engine which uses a fuel gas having poor compression ignition properties as a main fuel and diesel fuel such as light oil or kerosene having good compression ignition properties as a pilot fuel.
- the gas engine of Patent Document 2 includes an intake port and a diesel fuel injection device provided in a cylinder head, and a fuel gas injection device provided in a cylinder peripheral wall. Then, air is introduced into the combustion chamber from the intake port during the intake stroke in which the piston descends, and fuel gas is injected from the fuel gas injection device into the combustion chamber at an appropriate time between the late stage of the intake stroke and the late stage of the compression stroke. It has become.
- the diesel fuel is injected from the diesel fuel injection device into the combustion chamber at a timing when the piston rises to the vicinity of the top dead center, and the diesel fuel is self-ignited in the combustion chamber to burn the fuel gas as the main fuel. It is configured.
- Patent Document 3 discloses a premixed combustion method (gas operation mode) in which fuel gas and air are mixed and then flowed into the combustion chamber, and a diffusion combustion method (diesel in which fuel oil is directly injected into the combustion chamber and burned There is disclosed a dual fuel engine which can cope with any fuel in the operation mode).
- Patent Document 4 discloses a dual fuel engine capable of switching between a diesel operation mode and a pilot injection fuel ignition gas operation mode by direct injection.
- the main fuel and the pilot fuel are supplied to the combustion chamber almost simultaneously near the top dead center, so the main fuel injected into the combustion chamber is burned immediately after being stirred. Ru. Therefore, the combustion mode of the main fuel is diffusion combustion. In the case of diffusion combustion, uniform combustion is more difficult than in the case of premixed combustion, and there is a problem that NOx (nitrogen oxide) is easily generated in a high temperature combustion region.
- the gas engine of Patent Document 2 mentioned above is an invention made for increasing the amount of air taken into the combustion chamber. That is, while the invention of Patent Document 2 has conventionally introduced a mixture of fuel gas and air from the intake port, only the air is sucked from the intake port, and a fuel gas injection device is separately provided. Is configured. Then, the fuel gas injection device injects the fuel gas into the combustion chamber at different timing from the suction stroke to increase the amount of air taken into the combustion chamber from the intake port, thereby improving the engine output. ing.
- Such a patent document 2 does not disclose any technical idea of suppressing the generation of NOx (nitrogen oxide) by promoting the pre-mixing.
- Patent Documents 3 and 4 described above inject a small amount of fuel oil as a pilot fuel into the high temperature combustion chamber during the gas operation mode, and self-ignite the injected fuel oil to burn the fuel in the combustion chamber. It is configured to burn the gas. As described above, in the method of burning fuel gas using fuel oil as a pilot fuel, there is a problem that the amount of black smoke and PM generated in the gas operation mode increases. Further, Patent Documents 3 and 4 described above are all inventions directed to 4-cycle engines, and are not directed to 2-cycle engines as in the present invention.
- the present invention has been made in view of the problems of the prior art as described above, and it is an object of the present invention to provide a two-stroke gas engine capable of suppressing the generation of black smoke, PM, NOx and the like.
- the present invention is an invention made to achieve the above-mentioned object,
- the two-stroke gas engine of the present invention is Cylinder and cylinder head, A piston housed in the cylinder and defining a main combustion chamber between a peripheral wall of the cylinder and the cylinder head; Fuel gas injection means for injecting a fuel gas into the main combustion chamber; A scavenging port opened in a peripheral wall of the cylinder for supplying air into the main combustion chamber when the piston is positioned near a bottom dead center; An auxiliary chamber cap provided internally to the cylinder head, wherein an auxiliary combustion chamber communicating with the main combustion chamber via a nozzle hole is defined in the inside, and an ignition plug is provided in the auxiliary combustion chamber; In the gas operation mode, the fuel gas is injected into the main combustion chamber by the fuel gas injection means when the piston is in the upward stroke and the piston is positioned 10 ° to 100 ° before the top dead center.
- Fuel injection timing control means for causing the fuel gas to be injected into the main combustion chamber by the fuel gas injection means when the piston is positioned near the top dead center; Ignition timing control means for operating the spark plug when the piston is located near the top dead center to ignite a mixture of fuel gas and air in the auxiliary combustion chamber; It is characterized by having.
- the two-stroke gas engine of the present invention thus configured injects fuel gas by the fuel injection timing control means when the piston is positioned 10 ° to 100 ° before the top dead center, and mixes the air-fuel mixture into the main combustion chamber. Generate The generated air-fuel mixture flows into the auxiliary combustion chamber through the injection hole of the auxiliary chamber cap in the process of further raising the piston. Then, when the piston is located near the top dead center, the ignition timing control means ignites the air-fuel mixture in the sub combustion chamber to generate a torch in the sub combustion chamber, and the torch is ejected from the main combustion chamber through the injection hole. I will do it. Thus, the fuel gas injected when the piston is located near the top dead center and the mixture in the main combustion chamber are burned.
- the premixing of the fuel gas and the air injected when the piston is positioned at 40 ° to 100 ° before the top dead center is promoted, so that the diffusion combustion which occupies the entire combustion is The ratio decreases, and the generation of NOx (nitrogen oxide) can be suppressed.
- the fuel gas supply means may be configured to supply the fuel gas to the fuel gas injection means, and the fuel gas supply means may be configured to supply the fuel gas to the sub combustion chamber. desirable.
- the fuel gas supply means for supplying the fuel gas to the fuel gas injection means is configured to be able to supply the fuel gas also to the sub combustion chamber, the flow rate of the mixture flowing into the sub combustion chamber and The torch can be generated stably in the auxiliary combustion chamber regardless of the concentration or the like.
- the fuel gas is injected when the piston is positioned 10 ° to 100 ° before the top dead center, thereby promoting the premixing of the fuel gas and the air, and the fuel It is possible to provide a two-cycle gas engine that suppresses the generation of black smoke, PM, NOx and the like and improves fuel efficiency performance by igniting a mixture of fuel gas and air by an ignition plug without using oil. it can.
- FIG. 1 is a top view of a two-stroke gas engine according to a first embodiment of the present invention. It is an AA cross section in FIG. It is a BB cross section in FIG. It is sectional drawing which expanded and showed the subchamber nozzle
- FIG. 5 is a schematic cross-sectional view showing a two-stroke gas engine according to a second embodiment of the present invention.
- FIG. 1 is a top view showing a two-stroke gas engine according to a first embodiment
- FIG. 2A is a cross section taken along line AA in FIG. 1
- FIG. 2B is a cross section taken along line BB in FIG.
- FIG. 3 is an enlarged sectional view showing the auxiliary chamber cap according to the first embodiment
- FIG. 4 is for explaining the injection timing of fuel gas and the operation timing of the spark plug according to the first embodiment.
- FIG. First based on FIG. 1, FIG. 2A, FIG. 2B, FIG. 3, and FIG. 4, the structure of the two-stroke gas engine concerning 1st Embodiment is demonstrated.
- the two-stroke gas engine 1 of the present embodiment advances and retracts into a cylindrical cylinder 2, a cylinder head 3 coupled to the upper end side of the cylinder 2, and the cylinder 2. And a freely accommodated piston 4.
- a main combustion chamber c1 is defined between the peripheral wall 2a of the cylinder 2, the top wall 3a of the cylinder head 3 and the top surface 4a of the piston 4.
- symbol 5 in the figure has shown the piston ring.
- a scavenging port 6 is opened in the peripheral wall 2 a on the lower side of the cylinder 2.
- the scavenging port 6 is formed at a position above the top surface 4a (indicated by a two-dot chain line in the drawing) of the piston 4 located near the bottom dead center, and the piston 4 is located near the bottom dead center Occasionally, air is supplied from the scavenging port 6 to the main combustion chamber c1.
- an exhaust port is opened, and an exhaust valve 7 for opening and closing the exhaust port is provided at the top of the cylinder head 3, and an exhaust valve 7 for opening and closing the exhaust port is provided. The exhaust valve 7 is opened until the piston 4 reaches a position of about 100 ° before top dead center during a scavenging stroke in which the piston 4 is in a rising stroke. Then, the exhaust gas of the previous stroke remaining in the main combustion chamber c1 is scavenged by the air supplied from the scavenging port 6 to the main combustion chamber c1.
- the gas engine 1 of the present embodiment is configured as a dual fuel engine configured so as to be switchable between a gas operation mode of operating by burning a fuel gas and a diesel operation mode of operating by burning a fuel oil.
- a fuel gas injection device 8 fuel gas injection means for injecting a fuel gas such as natural gas into the main combustion chamber c1 in the gas operation mode, and a fuel oil having good compression ignition properties such as light oil in the main combustion chamber c1
- Fuel oil injection devices 10 fuel oil injection means for injecting (not shown) are provided in the cylinder head 3 respectively.
- two fuel gas injection devices 8 and two fuel oil injection devices 10 are respectively formed at positions 180 ° apart in the circumferential direction centering around the cylinder center o. Further, the fuel gas injection device 8 is configured to inject the fuel gas 8a, 8b in the same direction as the orientation direction of the scavenging port 6 described above.
- the fuel gas injection device 8 and the fuel oil injection device 10 are connected to an engine control unit (ECU) 12 via a cable 14 as shown in FIGS. 2A and 2B.
- the ECU 12 is also connected via a cable 16 to a crank angle sensor 15 that detects the rotation angle of the crankshaft 17.
- the phase of the piston 4 is detected by receiving a signal applied to the rotation angle of the crankshaft 17 from the crank angle sensor 15.
- the fuel gas injection device 8 and the fuel oil injection device 10 inject the fuel gas 8a, 8b and the fuel oil to the main combustion chamber c1 at a predetermined timing based on the signal transmitted from the ECU 12.
- the ECU 12 sends a signal to the fuel gas injection device 8 As shown in FIG. 4, the fuel gas injection device 8 injects the fuel gas 8b into the main combustion chamber c1.
- the injected fuel gas 8b mixes with the air inside the main combustion chamber c1 in the process of the piston 4 rising to form an air-fuel mixture 20.
- the air-fuel mixture 20 diffuses into the main combustion chamber c1, and also diffuses into the sub combustion chamber c2 communicating with the main combustion chamber c1 through the injection hole 9b.
- the piston 4 when the piston 4 is positioned near the top dead center, a signal is transmitted from the ECU 12 to the fuel gas injection device 8, and the fuel gas 8a is injected from the fuel gas injection device 8 to the main combustion chamber c1.
- the ECU 12 corresponds to the fuel injection timing control means in the present embodiment.
- the mixture 20 is adapted to burn.
- the fuel oil injection device 10 injects the fuel oil into the main combustion chamber c1. It is supposed to be Then, in the main combustion chamber c1 under a high temperature atmosphere, the fuel oil having good compression ignition property is self-ignited, whereby the fuel oil is burned in the main combustion chamber c1.
- the vicinity of the top dead center means a state where the piston 4 is located in a range of 10 ° before the top dead center to 20 ° after the top dead center.
- the number of installed fuel gas injection devices 8 and fuel oil injection devices 10 is not particularly limited, and may be one, for example. However, in the present embodiment in which the exhaust valve 7 is provided at the top of the cylinder head 3, a plurality of fuel gas injection devices 8 and fuel oil injection devices 10 are arranged at equal intervals in the circumferential direction. Is preferred.
- a fuel gas supply pipe 36 is connected to the fuel gas injection device 8 and is connected to the fuel gas cylinder 34 via a regulator 32 for adjusting the supply amount of the fuel gas. Then, by adjusting the opening degree of the regulator 32, the fuel gas stored under pressure in the fuel gas cylinder 34 is supplied to the fuel gas injection device 8 via the fuel gas supply pipe 36. It has become. That is, the fuel gas supply means 30 for supplying the fuel gas to the fuel gas injection device 8 is constituted by the regulator 32, the fuel gas cylinder 34 and the fuel gas supply pipe 36.
- the fuel oil injection pipe 10 is connected to the fuel oil injection device 10, and is connected to the fuel tank 46 storing the fuel oil via the common rail 42 and the supply pump 44. .
- the high pressure fuel oil pressurized by the supply pump 44 and accumulated in the common rail 42 is supplied to the fuel oil injection device 10 via the fuel oil supply pipe 48. That is, the common rail 42, the supply pump 44, the fuel tank 46 and the fuel oil supply pipe 48 constitute a fuel oil supply means 40 for supplying high-pressure fuel oil to the fuel oil injection device 10.
- the cylinder head 3 is provided with a sub chamber cap 9 inside.
- the number of the auxiliary chamber mouthpieces 9 is not particularly limited, but in the present embodiment, two sub-chamber mouthpieces 9 are provided for one fuel gas injection device 8.
- the auxiliary combustion chamber c1 is defined inside, and the ignition plug 11 is provided on the upper portion of the auxiliary combustion chamber c1.
- an injection hole 9b is bored at the tip of the auxiliary chamber mouth ring 9, and the auxiliary combustion chamber c2 and the main combustion chamber c1 are communicated with each other through the injection hole 9b.
- the auxiliary chamber base 9 and the ECU 12 are connected via a cable 18. And based on the signal transmitted from ECU12, the ignition plug 11 operates at a predetermined timing. Specifically, in the gas operation mode, when the piston 4 is located near the top dead center, a signal is transmitted from the ECU 12 to the spark plug 11, and as shown in FIG. The mixture 20 is ignited to generate a torch 9a. That is, the ECU 12 corresponds to the ignition timing control means in the present embodiment.
- FIG. 5 is a schematic view for explaining the operation of the two-stroke gas engine according to the first embodiment, in which (a) is a state where the piston 4 is positioned 10 ° to 100 ° before top dead center. (B) shows a state where the piston 4 is located about 5 ° before the top dead center, and (c) shows a state where the piston 4 is located at the top dead center.
- the two-stroke gas engine 1 of this embodiment is shown when the piston 4 is in the upward stroke and the piston 4 is positioned 10 ° to 100 ° before top dead center (FIG. 5A)
- Fuel gas 8b is injected from the fuel gas injection device 8 to the main combustion chamber c1 based on the signal transmitted from the ECU 12 (fuel injection timing control means).
- the injection is performed in the process where the piston 4 further rises near the top dead center.
- the mixed fuel gas 8b and the air inside the main combustion chamber c1 are mixed to promote premixing.
- gaseous mixture 20 is produced
- the fuel gas injection device 8 sends fuel from the fuel gas injection device 8 based on the signal transmitted from the above-described ECU 12 (fuel injection timing control means). Gas 8a is injected. Further, based on the signal transmitted from the above-described ECU 12 (ignition timing control means), the spark plug 11 operates to ignite the air-fuel mixture 20 in the auxiliary combustion chamber c2.
- the two-stroke gas engine 1 of the present embodiment injects the fuel gas 8b when the piston 4 is positioned 10 to 100 degrees before the top dead center, and when the piston 4 is positioned near the top dead center.
- the fuel gas 8 a is injected and the spark plug 11 is operated. Therefore, the premixing of the fuel gas 8b injected with the air is promoted when the piston 4 is positioned 10 ° to 100 ° before the top dead center, and the mixture 20 is generated.
- the part is premixed combustion. Therefore, the generation of NOx (nitrogen oxide) can be suppressed as compared with the conventional gas engine in which all of the combustion modes are diffusion combustion.
- FIG. 6 is a schematic sectional view showing a two-stroke gas engine according to the second embodiment
- FIG. 7 is an enlarged sectional view showing a sub-chamber nozzle according to the second embodiment
- FIG. 8 is a schematic view for explaining the fuel gas injection timing and the operation timing of the spark plug according to the second embodiment.
- the two-stroke gas engine 1 of the present embodiment has basically the same configuration as the two-stroke gas engine 1 of the above-described embodiment, and the same reference numerals are given to the same components, and the detailed description thereof. Omit.
- the two-stroke gas engine 1 of this embodiment differs from the above-described embodiment in that, as shown in FIG. 6, in the fuel gas supply means 30 comprised of the regulator 32, fuel gas cylinder 34 and fuel gas supply pipe 36 A branch pipe 36 a branches from the supply pipe 36 and is connected to the above-described auxiliary chamber cap 9. Further, as shown in FIG. 7, a control valve 36b is provided in the middle of the branch pipe 36a.
- the control valve 36 b is, for example, an electromagnetic control valve connected to the ECU 12, and is configured to be opened and closed based on a signal transmitted from the ECU 12. Then, by opening the control valve 36 b, fuel gas can be supplied to the sub combustion chamber c ⁇ b> 2 defined inside the sub chamber cap 9.
- the two-stroke gas engine 1 of this embodiment configured as described above has the sub combustion chamber c2 by the fuel gas supply means 30 described above at an appropriate time when the piston 4 is in the upward stroke.
- the fuel gas 8c is supplied to the Then, when the piston 4 is positioned near the top dead center, a signal is transmitted from the ECU 12 to the spark plug 11, and as shown in FIG. 8, the mixture of the fuel gas 8c and air in the auxiliary combustion chamber c2 To generate a torch 9a.
- the fuel gas supply means 30 for supplying the fuel gas to the fuel gas injection device 8 is configured to be able to supply the fuel gas also to the sub combustion chamber c2
- the sub combustion The torch 9a can be generated stably in the auxiliary combustion chamber c2 regardless of the flow rate and concentration of the air-fuel mixture 20 flowing into the chamber c2.
- the fuel gas is injected when the piston is positioned 10 ° to 100 ° before the top dead center, thereby promoting the premixing of the fuel gas and the air.
- the two-stroke gas engine of the present invention is configured to be switchable between a gas operation mode operating with combustion of fuel gas and a diesel operation mode operating with combustion of fuel oil.
- the case of the engine has been described as an example.
- the two-stroke gas engine 1 of the present invention is not limited to this, and can be applied to a normal gas engine which does not have the fuel oil injection means 10 and always burns and operates only fuel gas.
- the two-stroke gas engine of the present invention can be suitably used as an engine for ships, particularly for construction machinery, for large vehicles, for power generation, and the like.
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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)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
本発明の2サイクルガスエンジンは、
シリンダ及びシリンダヘッドと、
前記シリンダ内に収容されるとともに、前記シリンダの周壁及び前記シリンダヘッドとの間で主燃焼室を画成するピストンと、
前記主燃焼室に燃料ガスを噴射する燃料ガス噴射手段と、
前記ピストンが下死点近傍に位置する時に前記主燃焼室内に空気を供給する前記シリンダの周壁に開口した掃気ポートと、
前記主燃焼室と噴孔を介して連通する副燃焼室が内部に画成されるとともに該副燃焼室に点火プラグが設けられた、前記シリンダヘッドに内設された副室口金と、
ガス運転モード中において、前記ピストンが上昇行程にあり、且つ前記ピストンが上死点の10°~100°手前に位置する時に前記燃料ガス噴射手段によって前記主燃焼室に燃料ガスを噴射させ、さらに前記ピストンが上死点近傍に位置する時に前記燃料ガス噴射手段によって前記主燃焼室に燃料ガスを噴射させる燃料噴射タイミング制御手段と、
前記ピストンが上死点近傍に位置する時に前記点火プラグを作動させ、副燃焼室内の燃料ガスと空気との混合気を点火する点火タイミング制御手段と、
を備えたことを特徴とする。
ただし、本発明の範囲は以下の実施形態に限定されるものではない。以下の実施形態に記載されている構成部品の寸法、材質、形状、その相対配置などは、特に記載がない限り、本発明の範囲をそれにのみ限定する趣旨ではなく、単なる説明例に過ぎない。
図1は、第1の実施形態にかかる2サイクルガスエンジンを示した上面図、図2Aは図1におけるA-A断面、図2Bは図1におけるB-B断面である。また図3は、第1の実施形態にかかる副室口金を拡大して示した断面図、図4は、第1の実施形態にかかる燃料ガスの噴射タイミング及び点火プラグの作動タイミングを説明するための概略図である。先ず、図1、図2A、図2B、図3、及び図4を基にして、第1の実施形態にかかる2サイクルガスエンジンの構成について説明する。
次に、第2の実施形態にかかる2サイクルガスエンジンについて図6~図8を基に説明する。図6は、第2の実施形態にかかる2サイクルガスエンジンを示した概略断面図、図7は、第2の実施形態にかかる副室口金を拡大して示した断面図である。また図8は、第2の実施形態にかかる燃料ガスの噴射タイミング及び点火プラグの作動タイミングを説明するための概略図である。なお本実施形態の2サイクルガスエンジン1は、上述した実施形態の2サイクルガスエンジン1と基本的には同様の構成であって、同一の構成には同一の符号を付し、その詳細な説明を省略する。
例えば上述した実施形態では、本発明の2サイクルガスエンジンが、燃料ガスを燃焼して運転するガス運転モードと、燃料油を燃焼して運転するディーゼル運転モードとが切り替え可能に構成されたデュアルフューエルエンジンである場合を例として説明した。しかしながら本発明の2サイクルガスエンジン1はこれに限定されず、燃料油噴射手段10を備えてなく、常時燃料ガスだけを燃焼して運転する通常のガスエンジンに対しても適用可能である。
Claims (2)
- 2サイクルガスエンジンにおいて、
シリンダ及びシリンダヘッドと、
前記シリンダ内に収容されるとともに、前記シリンダの周壁及び前記シリンダヘッドとの間で主燃焼室を画成するピストンと、
前記主燃焼室に燃料ガスを噴射する燃料ガス噴射手段と、
前記ピストンが下死点近傍に位置する時に前記主燃焼室内に空気を供給する前記シリンダの周壁に開口した掃気ポートと、
前記主燃焼室と噴孔を介して連通する副燃焼室が内部に画成されるとともに該副燃焼室に点火プラグが設けられた、前記シリンダヘッドに内設された副室口金と、
前記ピストンが上昇行程にあり、且つ前記ピストンが上死点の10°~100°手前に位置する時に前記燃料ガス噴射手段によって前記主燃焼室に燃料ガスを噴射させ、さらに前記ピストンが上死点近傍に位置する時に前記燃料ガス噴射手段によって前記主燃焼室に燃料ガスを噴射させる燃料噴射タイミング制御手段と、
前記ピストンが上死点近傍に位置する時に前記点火プラグを作動させ、副燃焼室内の燃料ガスと空気との混合気を点火する点火タイミング制御手段と、
を備えたことを特徴とする2サイクルガスエンジン。 - 前記燃料ガス噴射手段に燃料ガスを供給する燃料ガス供給手段を有し、該燃料ガス供給手段が、前記副燃焼室に対して燃料ガスを供給可能に構成されていることを特徴とする請求項1に記載の2サイクルガスエンジン。
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KR1020147026709A KR101664640B1 (ko) | 2012-04-11 | 2013-02-07 | 2 사이클 가스 엔진 |
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EP (1) | EP2837789A4 (ja) |
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US20150075506A1 (en) | 2015-03-19 |
EP2837789A1 (en) | 2015-02-18 |
KR101664640B1 (ko) | 2016-10-10 |
EP2837789A4 (en) | 2015-12-02 |
KR20140124015A (ko) | 2014-10-23 |
JP2013217335A (ja) | 2013-10-24 |
CN104126061A (zh) | 2014-10-29 |
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