CN112049722B - Fuel gas double-injection system for improving dynamic response of marine dual-fuel engine and injection control method thereof - Google Patents

Fuel gas double-injection system for improving dynamic response of marine dual-fuel engine and injection control method thereof Download PDF

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CN112049722B
CN112049722B CN202010927771.0A CN202010927771A CN112049722B CN 112049722 B CN112049722 B CN 112049722B CN 202010927771 A CN202010927771 A CN 202010927771A CN 112049722 B CN112049722 B CN 112049722B
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injection valve
gas
fuel gas
fuel
dual
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CN112049722A (en
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丁宇
贲虹凯
向拉
徐珂达
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Harbin Engineering 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0675—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston the combustion space being substantially spherical, hemispherical, ellipsoid or parabolic
    • 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
    • F02D41/0025—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
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F02D41/064—Introducing corrections for particular operating conditions for engine starting or warming up for starting at cold start
    • 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
    • F02D41/3094—Controlling fuel injection the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the cylinder
    • 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
    • F02D41/32—Controlling fuel injection of the low pressure type
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/28—Other pistons with specially-shaped head
    • 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
    • F02M21/0248—Injectors
    • F02M21/0275—Injectors for in-cylinder direct injection, e.g. injector combined with spark plug
    • 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
    • F02M21/0248—Injectors
    • F02M21/0278—Port fuel injectors for single or multipoint injection into the air intake system
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • 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)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention aims to provide a fuel gas double-injection system for improving dynamic response of a marine dual-fuel engine and an injection control method thereof. The two fuel gas injection valves work cooperatively according to different working conditions, so that the high-efficiency low-emission combustion of the dual-fuel engine is realized, the flame propagation speed is accelerated, the combustion time is shortened, the combustion quality is favorably improved, the exhaust temperature is reduced, and the problems of fire and detonation of the dual-fuel engine can be solved.

Description

Fuel gas double-injection system for improving dynamic response of marine dual-fuel engine and injection control method thereof
Technical Field
The invention relates to an engine and a control method thereof, in particular to a dual-fuel engine and a control method thereof.
Background
With the stricter emission regulations, natural gas has become an alternative fuel for conventional diesel engines due to its high calorific value, clean emission, large storage capacity, and the like, in order to improve and protect the environment.
The normal pressure ignition temperature of natural gas is about 600-650 ℃, which is far higher than that of diesel oil (about 280 ℃), and the natural gas is difficult to ignite and burn directly in a compression ignition mode, and the natural gas is generally ignited by the diesel oil or a spark plug.
By controlling the intake air amount by the throttle valve, the mechanical efficiency is reduced by pumping loss at the time of part load.
At present, the existing dual-fuel engines are all single fuel gas injection valves, the fuel gas intake mode is air intake manifold injection or air intake channel and in-cylinder direct injection, and the mixed gas is ignited by a spark plug or after compression ignition by diesel oil.
The premixed combustion is flame propagation type combustion, after the mixed gas is combusted, the flame core continuously propagates along the combustion chamber, and the mixed gas in each layer is combusted successively. At high load, the temperature in the cylinder is high, and the unburned region is easy to generate spontaneous combustion to form new fire nuclei to generate a detonation phenomenon.
The gas is sprayed into the gas inlet pipe by the gas inlet main pipe injection system to form mixed gas with air, and the low-temperature combustion of premixed diesel ignition can improve the heat efficiency of the engine and effectively reduce NOx emission. However, the working condition range is small, the knock is limited under high load, and the dynamic characteristic is poor. The fuel injection mode has poor responsiveness of the engine, and the function of quickly stopping air and supplying air for each cylinder is difficult to realize.
The direct injection type gas dual-fuel engine in the cylinder adopts a diesel cycle, so that stronger power can be provided under high load, and the occurrence of knocking is effectively inhibited. The fuel gas injection quantity can be more accurately controlled under the load and load increasing working condition, and the dynamic response is improved.
Disclosure of Invention
The invention aims to provide a fuel gas double-injection system with better dynamic property and emission property and capable of improving the dynamic response of a marine dual-fuel engine and an injection control method thereof.
The purpose of the invention is realized as follows:
the invention relates to a fuel gas double-injection system for improving dynamic response of a marine dual-fuel engine, which is characterized in that: the high-pressure gas combustion engine comprises a cylinder cover, a cylinder body and a piston, wherein a spherical combustion chamber is formed among the cylinder cover, the cylinder body and the piston, an air inlet manifold, a high-pressure gas injection valve and a pilot diesel injection valve are arranged in the cylinder cover, the air inlet manifold is connected with an air inlet main pipe, a throttle valve is arranged at the joint of the air inlet main pipe and the air inlet manifold, a low-pressure gas injection valve is arranged in the air inlet manifold behind the throttle valve, and the high-pressure gas injection valve and the pilot diesel injection valve are positioned above the spherical combustion chamber.
The invention relates to a fuel gas double-injection system for improving dynamic response of a marine dual-fuel engine, which also comprises:
1. the low-pressure fuel gas injection valve and the high-pressure fuel gas injection valve work independently, and the diesel oil injection proportion of the pilot diesel oil injection valve accounts for 1-5% of the energy proportion of the whole circulating fuel.
The invention relates to a fuel gas double-injection control method for improving dynamic response of a marine dual-fuel engine, which is characterized by comprising the following steps of:
during starting and low load, the dual-fuel engine adopts a low-pressure fuel gas injection valve to inject fuel gas, and the high-pressure fuel gas injection valve does not work;
when the load is medium, the low-pressure fuel gas injection valve and the high-pressure fuel gas injection valve work together;
at high load, the dual fuel engine switches to the diesel operating cycle and only the high pressure fuel gas injection valve operates.
The fuel gas dual-injection control method for improving the dynamic response of the marine dual-fuel engine can further comprise the following steps of:
1. the medium load is 15% -70%, the low-pressure gas injection valve firstly injects gas and air to form combustible mixed gas, the high-pressure gas injection valve in the cylinder is used as a main gas injection valve, the gas injected for the first time forms dilute mixed gas in the cylinder, the gas injected for the second time is intensively distributed on the upper layer of the combustion chamber to form natural gas concentration distribution with a thick upper part and a thin lower part, the diesel oil is ignited to be injected and compressed for spontaneous combustion to form a flame center, and the flame front is propagated from the high concentration of the mixed gas to the low concentration of the mixed gas.
2. The high load is more than 70%, the dual-fuel engine is switched to a diesel cycle working mode, fuel gas is mixed with air in a gaseous state, the volume of the mixture gas occupies about 10%, a high-pressure fuel gas injection valve is adopted to directly inject high-pressure fuel gas into a cylinder, and combustible mixture gas in the cylinder is ignited by ignition diesel oil.
The invention has the advantages that: the dual-fuel engine has the advantages that the dual-fuel engine combines the advantages of a single fuel gas injection valve of the traditional dual-fuel engine, uses the dual fuel gas injection valve and a fuel gas injection strategy to make reasonable design, considers different influence factors under different working conditions, and meets the emission requirements of various sea conditions, so that the dual-fuel engine has better comprehensive performance.
When the cold machine is started or the load is low, the main pipe single-point injection is started, the cold start effect is improved, the carbon deposition is reduced, when the economy is mainly required for the medium load, the gas single-point injection valve and the in-cylinder high-pressure gas injection valve work together, and when the emergency load or the large load needs strong power, the in-cylinder high-pressure gas injection is adopted, so that the dynamic response can be improved, and the detonation can be avoided. The two fuel gas injection valves work in a matched mode according to different working conditions, so that efficient low-emission combustion of the dual-fuel engine is achieved, flame propagation speed is accelerated, combustion time is shortened, combustion quality is improved, exhaust temperature is lowered, and the problems of fire catching and knocking of the dual-fuel engine can be solved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
with reference to fig. 1, the gas dual-injection system for improving dynamic response of a marine dual-fuel engine of the invention comprises an air inlet manifold 1, a throttle 2, a low-pressure gas injection valve 3, an air inlet manifold 4, a high-pressure gas injection valve 5, a pilot diesel injection valve 6, an exhaust system 7, a spherical combustion chamber 8 and a piston 9. The combustion chamber is composed of a piston upper surface, a cylinder jacket peripheral wall and a cylinder cover lower surface, a single-point low-pressure gas injection valve 3 is installed at an air inlet main pipe, a high-pressure gas injection valve 5 is installed in the cylinder cover, and a pilot diesel injector 6 is installed in the cylinder cover.
The low-pressure fuel gas injection valve 3 and the high-pressure fuel gas injection valve 5 work independently. The diesel injector 6 is a porous large-flow injector, the number of the injector spray holes is 6-8, and a plurality of oil bundles are sprayed. The diesel injection proportion accounts for 1-5% of the energy proportion of the whole circulating fuel. The high-pressure fuel gas injection valve 5 in the cylinder adopts multiple injection. The combustion chamber 8 adopts a hemispherical structure.
Judging the engine load and selecting the working mode of the dual-fuel engine. When the engine is started and the load is low, namely the load is lower than 15%, the dual-fuel engine adopts the air inlet main pipe 1 to inject fuel gas, and the high-pressure fuel gas injection valve 5 in the cylinder does not work. When the medium load is 15% -70%, the gas single-point injection valve 3 and the cylinder high-pressure gas injection valve 5 work together. When the load is high, namely the load is more than 70%, the dual-fuel engine is switched to a diesel working cycle, and only the in-cylinder high-pressure fuel gas injection valve 5 works.
The combustion organization method is suitable for a four-stroke natural gas engine, and each cycle comprises an air inlet stroke, a compression stroke, a combustion power stroke and an exhaust stroke. The natural gas is easy to fire due to lean combustion when the load is low, namely the load is lower than 15%, so that the natural gas is injected by adopting the gas inlet main pipe, the gas is fully mixed with air in the gas inlet main pipe and then enters the cylinder, and the concentration of gas mixture in the cylinder can be uniform and suitable for combustion.
The diesel oil is ignited by injecting the diesel oil into the cylinder within the range of 20 ℃ A before the compression stroke piston and the top dead center, the multi-hole nozzle can enable the diesel oil to form a plurality of concentration areas in the cylinder, the atomization effect is good, the injection amount of the diesel oil is small, the combustion is slow, the air is sufficient, the combustion is sufficient, and the good emission performance can be realized.
When the load is 15% -70%, the dual-fuel engine adopts a common working mode of two fuel gas injection valves. The low-pressure fuel gas injection valve 5 injects a small amount of fuel gas and air to form combustible mixed gas with adaptive concentration, the high-pressure fuel gas injection valve 5 in the cylinder is used as a main fuel gas injection valve, and the percentage of main fuel required by injection circulation is reduced. The gas sprayed for the first time forms uniform dilute mixed gas in the cylinder, the gas sprayed for the second time is intensively distributed on the upper layer of the combustion chamber to form natural gas concentration distribution with a thick upper part and a thin lower part, the diesel oil is ignited to be sprayed and compressed for spontaneous combustion to form a flame center, the flame front is propagated from the high concentration of the mixed gas to the low concentration of the mixed gas, the flame propagation speed is accelerated, and the phenomenon that the tail end mixed gas is spontaneously combusted to generate new flame center to generate detonation before the flame front reaches is avoided.
When the load is higher than 70%, the dual-fuel engine is switched to a diesel cycle working mode, the gas is mixed with air in a gaseous state, the gas volume can occupy about 10% of the gas mixture volume, the required gas is increased in the high load state, the air inflow can be reduced by using the main pipe for air inflow, and the dual-fuel engine of the Otto cycle is easy to knock when the load is high, so that the high-pressure gas is directly injected into a cylinder by using a high-pressure gas injection valve under the high load working condition, and the combustible gas mixture in the cylinder is still ignited by the ignition diesel.
Under the dynamic working condition of medium and high load, the high-pressure fuel gas injection valve 5 is used as a main fuel injection valve, and the in-cylinder fuel gas injection can accurately control the injection quantity of each cylinder of fuel, thereby being beneficial to the air-fuel ratio control of a dual-fuel engine.
The hemispherical combustion chamber 8 has compact structure, short flame stroke, high combustion rate, less heat dissipation and high heat efficiency. The structure of the combustion chamber also allows the double-row arrangement of the air valves, and the diameter of the air inlet is larger, so that the inflation efficiency is higher, and the exhaust purification is facilitated.

Claims (1)

1. A fuel gas double-injection control method for improving dynamic response of a marine dual-fuel engine is characterized by comprising the following steps: the gas double-injection system for improving the dynamic response of the marine dual-fuel engine comprises a cylinder cover, a cylinder body and a piston, wherein a spherical combustion chamber is formed among the cylinder cover, the cylinder body and the piston, an air inlet manifold, a high-pressure gas injection valve and a pilot diesel injection valve are arranged in the cylinder cover, the air inlet manifold is connected with an air inlet main pipe, a throttle valve is arranged at the joint of the air inlet main pipe and the air inlet manifold, a low-pressure gas injection valve is arranged in the air inlet manifold behind the throttle valve, and the high-pressure gas injection valve and the pilot diesel injection valve are positioned above the spherical combustion chamber;
the low-pressure fuel gas injection valve and the high-pressure fuel gas injection valve work independently, and the diesel oil injection proportion of the pilot diesel oil injection valve accounts for 1-5% of the energy proportion of the whole circulating fuel;
during starting and low load, the dual-fuel engine adopts a low-pressure fuel gas injection valve to inject fuel gas, and the high-pressure fuel gas injection valve does not work;
when the load is medium, the low-pressure fuel gas injection valve and the high-pressure fuel gas injection valve work together;
at high load, the dual-fuel engine is switched to a diesel working cycle, and only the high-pressure fuel gas injection valve works;
the medium load is 15% -70%, the low-pressure gas injection valve firstly injects gas and air to form combustible mixed gas, the high-pressure gas injection valve in the cylinder is used as a main gas injection valve, the gas injected for the first time forms dilute mixed gas in the cylinder, the gas injected for the second time is intensively distributed on the upper layer of the combustion chamber to form natural gas concentration distribution with a thick upper part and a thin lower part, the diesel oil is ignited to be injected and compressed for spontaneous combustion to form a flame center, and a flame front is propagated from the high concentration of the mixed gas to the low concentration of the mixed gas;
the high load is more than 70%, the dual-fuel engine is switched to a diesel cycle working mode, fuel gas is mixed with air in a gaseous state, the volume of the mixture gas occupies about 10%, a high-pressure fuel gas injection valve is adopted to directly inject high-pressure fuel gas into a cylinder, and combustible mixture gas in the cylinder is ignited by ignition diesel oil.
CN202010927771.0A 2020-09-07 2020-09-07 Fuel gas double-injection system for improving dynamic response of marine dual-fuel engine and injection control method thereof Active CN112049722B (en)

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Publication number Priority date Publication date Assignee Title
US6675748B2 (en) * 2000-02-11 2004-01-13 Westport Research Inc. Method and apparatus for fuel injection into an internal combustion engine
CN105041512B (en) * 2015-05-31 2017-08-11 清华大学 A kind of dual fuel engine lean burn method
CN109209656B (en) * 2018-09-29 2020-11-03 哈尔滨工程大学 Combustion organization method for natural gas engine
CN109296446B (en) * 2018-09-29 2020-12-04 哈尔滨工程大学 Diesel micro-injection ignition natural gas engine combustion organization method with natural gas high-low pressure mixed injection and pre-combustion chamber
CN109386396B (en) * 2018-09-29 2021-09-10 哈尔滨工程大学 Combustion control method for natural gas engine
CN110905652B (en) * 2019-12-20 2022-04-29 哈尔滨工程大学 Engine with multiple high-pressure direct injection of natural gas in cylinder and layered rapid combustion method of engine
CN111305978A (en) * 2020-02-18 2020-06-19 哈尔滨工程大学 Gas engine gas supply device with step gas supply pressure and control method thereof

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