CN110318910A - A kind of natural gas engine combustion system and control method - Google Patents
A kind of natural gas engine combustion system and control method Download PDFInfo
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- CN110318910A CN110318910A CN201910559235.7A CN201910559235A CN110318910A CN 110318910 A CN110318910 A CN 110318910A CN 201910559235 A CN201910559235 A CN 201910559235A CN 110318910 A CN110318910 A CN 110318910A
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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
-
- 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
- F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
- F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
-
- 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
- F02M21/0221—Fuel storage reservoirs, e.g. cryogenic tanks
-
- 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
- F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return 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
- 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
- F02M21/0245—High pressure fuel supply systems; Rails; Pumps; Arrangement of valves
-
- 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
-
- 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
Landscapes
- 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)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
The purpose of the present invention is to provide a kind of natural gas engine combustion system and control methods, including engine, air accumulator, the engine includes cylinder head, cylinder, piston, cylinder head, bath-tub type combustion chamber is formed between cylinder and piston, air intake duct is set in cylinder head, exhaust duct, spark plug, high pressure fuel gas jet valve, intake valve is installed in air intake duct, exhaust valve is installed in exhaust duct, air accumulator connects the first gas rail by gas pressurized device, air accumulator connects the second gas rail by pressure regulator, first gas rail connects high pressure fuel gas jet valve, second gas rail connects jet valve group, the outlet of the outlet passageway of jet valve group is located in air intake duct.The present invention is in lean burn mode, pass through injection series, injection timing and the injection pulse width and high pressure fuel gas jet valve injection timing and injection pulse width of control jet valve group, it can be realized stratification of intake gases in cylinder, the stability for improving igniting, extends the potentiality of lean burn natural gas engine.
Description
Technical field
The present invention relates to a kind of engine system and control methods, specifically natural gas engine and its control
Method.
Background technique
Natural gas be it is a kind of cleaning, efficient high-grade energy, natural gas engine can achieve the higher thermal efficiency and compared with
Low DS NOx Est.Natural gas engine gas supply mode can be divided into two class of air inlet in cylinder external admission and cylinder, cylinder external admission at present
Mode includes general pipeline air inlet and gas manifold inlet.Since the natural gas and air of general pipeline air admission type natural gas engine are in general pipeline
It is mixed to form the combustion mixture centainly matched, each cylinder is entered back into and carries out work by combustion, so that inlet manifold exists always
There is the danger exploded once there is fire source in gaseous mixture；Simultaneously as to will appear each cylinder air inlet uneven for general pipeline air inlet
Property, so that such engine is unable to accurately control the air-fuel ratio of each cylinder.Gas manifold inlet formula natural gas engine is usually in air inlet discrimination
Fuel gas injection valve is installed, natural gas can spray into and each cylinder phase at regular time and quantity on the air intake duct of pipe root or cylinder head
In the inlet manifold or air intake duct of connection, the single cylinder control of air-fuel ratio may be implemented.
Lean Burning Technique is to improve the effective measures of engine power performance, economy and emission performance, using thin combustion
Burning mode is effectively reduced delivery temperature and reduces the danger of pinking, and can by modes such as supercharging technologies by increasing air capacity
Effectively to improve the efficiency of engine.But traditional lean combustion mode has the following problems: for general pipeline air admission type or
The gaseous mixture of gas manifold inlet formula natural gas engine, natural gas and air enters cylinder, after further mixing in cylinder still
There are non-uniform mixing gas, there is a situation where that gaseous mixture is excessively dilute, this will affect the stability of plug ignition.In order to improve igniting
Stability, the mode of stratified combustion is generallyd use, by by gas in-cylinder mixture strength natural layering from thick to thin, so that fiery
Assemble rich mixture around Hua Sai, the other most of regions in combustion chamber form Weak mixture, guarantee engine in any operating condition
The stability of down-firing, Weak mixture in pilot combustion room after kindling.This stratified combustion mode is often required that in combustion chamber
A wide range of and high score depth gaseous mixture is formed in entire scope, so that in the situation that engine speed is lower or load is larger
Under, dense area's gaseous mixture cannot get sufficient oxygen, cause incomplete combustion, and CO discharge amount increases, and spark plug nearby mixes
Gas overrich will appear the phenomenon that catching fire.In addition, the concentration of Weak mixture is lower than the mean concentration of gaseous mixture, unburned HC can be caused
Discharge amount increase.
Summary of the invention
The purpose of the present invention is to provide engine gas flow and air-fuel ratio spirit in different load operating condition may be implemented
A kind of natural gas engine combustion system and control method living and accurately control.
The object of the present invention is achieved like this:
A kind of natural gas engine combustion system of the present invention, it is characterized in that: including engine, air accumulator, the engine
Including cylinder head, cylinder, piston, bath-tub type combustion chamber is formed between cylinder head, cylinder and piston, air inlet is set in cylinder head
Road, exhaust duct, spark plug, high pressure fuel gas jet valve install intake valve in air intake duct, exhaust valve, air accumulator are installed in exhaust duct
The first gas rail is connected by gas pressurized device, air accumulator connects the second gas rail by pressure regulator, and the first gas rail connects high compression ignition
Gas jet valve, the second gas rail connect jet valve group, and the outlet of the outlet passageway of jet valve group is located in air intake duct.
A kind of natural gas engine combustion system of the present invention can also include:
1, jet valve group includes at least two snifting valves, and snifting valve is installed in valve block, and shares an outlet passageway.
2, high pressure fuel gas jet valve is tiltedly mounted in cylinder head, and spark plug is mounted on cylinder head center.
Present invention has an advantage that the present invention can be supplied according to engine different load operating condition flexible modulation gas flow
It gives, the single cylinder that air-fuel ratio may be implemented accurately controls, and is conducive to improve engine thermal efficiency, reduces discharge.Particularly in lean-burn
When combustion system, sprayed by injection series, injection timing and the injection pulse width and high pressure fuel gas jet valve that control jet valve group
Timing and injection pulse width are penetrated, can be realized stratification of intake gases in cylinder, improves the stability of igniting, extension lean-burn is natural
The potentiality of gas engine improve natural gas engine dynamic property, economy and emission performance.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is snifting valve group device sectional front view of the invention；
Fig. 3 is snifting valve group device bottom view of the invention；
Fig. 4 is every grade of snifting valve injection flow characteristic curve schematic diagram of jet valve group of the invention.
Specific embodiment
It illustrates with reference to the accompanying drawing and the present invention is described in more detail:
In conjunction with Fig. 1-4, a kind of natural gas engine with multiple spot multistage and the double fuel gas injections of in-cylinder direct-jet of the present invention fires
Burning system, including air accumulator 1, filter 2, pressure regulator 3, gas pressurized device 4, gas rail 5, jet valve group 6, cylinder head 7, cylinder
8, air intake duct 9, intake valve 10, exhaust duct 11, exhaust valve 12, spark plug 13, high pressure fuel gas jet valve 14, bathtub shaped combustion chamber
15, control system 16 etc..Engine includes two sets of gas supply systems, i.e., high in multiple spot multistage low-pressure fuel gas spraying system and cylinder
Press gas injection system.Multiple spot multistage low-pressure fuel gas spraying system is by air accumulator 1, filter 2, pressure regulator 3, gas rail 5, snifting valve
Group 6 is constituted.Jet valve group 6 has multiple snifting valves, and multiple snifting valves, which are mounted in the same valve block and share an outlet, to be led to
The outlet in road, 6 outlet passageway of jet valve group is mounted in the inlet manifold of each cylinder, is realized and is supplied the independence of each cylinder
Gas, natural gas pass sequentially through air accumulator 1, filter 2, pressure regulator 3, gas rail 5 and jet valve group 6 and are supplied in each cylinder, real
Existing multiple spot multistage low-pressure fuel gas supply.In cylinder high-pressure gas spraying system be by air accumulator 1, filter 2, gas pressurized device 4,
Gas rail 5 and high pressure fuel gas jet valve 14 etc. are constituted, and high pressure fuel gas jet valve 14 is tiltedly mounted in cylinder head, in inlet valve
Points of proximity fire moment high-pressure injection natural gas into cylinder after closing.Spark plug 13 is mounted on cylinder head center, is conducive to ignition energy
Amount is uniformly propagated around.Piston-top surface is equipped with a bathtub shaped combustion chamber 15, and natural gas and air are in bathtub shaped combustion chamber 15
It is easy to be mixed into more uniform combustion mixture.Jet valve group 6, intake valve 10, exhaust valve 12, spark plug 13, high-pressure gas spray
It penetrates valve 14 and various sensors is connect with control system 16 respectively, electronic control mode realizes that engine air-fuel ratio and igniting are fixed
When, jet timing accurate control.
It as shown in Figure 2,3, is snifting valve group apparatus structure schematic diagram of the invention, jet valve group 6 has multiple snifting valves,
Multiple snifting valves are mounted in the same valve block and share an outlet passageway, and the outlet of 6 outlet passageway of jet valve group is mounted on
In the inlet manifold of each cylinder, multiple snifting valves are connected with control system 16 respectively in jet valve group 6, can be according to control
16 instruction of system is at regular time and quantity to each cylinder manifold injection natural gas.As shown in figure 4, being every grade of snifting valve of jet valve group of the present invention
Injection flow characteristic curve schematic diagram.The structural parameters and discharge characteristic of every grade of snifting valve can be the same or different.It is minimum
Flow snifting valve can satisfy engine minimum discharge fuel gas supply and injection control required precision, multistage jet when working independently
Valve works at the same time maximum stream flow fuel gas supply and injection control requirement when meeting full engine load work.In engine charge
When stroke, it can control jet valve group 8 and be classified work, first the work of control single-stage snifting valve, then control multistage snifting valve simultaneously
Work, or control jet valve group work step by step, can control the work of single-stage snifting valve first, then control other single-stage snifting valves
It works step by step, forms different fuel gas injection rules, realize that the gas quantity of different combustion strategies accurately controls, pass through electronic control
Mode realizes combustion gas multi-stage jet.Multistage snifting valve can spray more gas quantities within the unit time, can be shorter
Time reaches setting equivalent proportion gaseous mixture, is conducive to the mixing of gaseous mixture Quick uniform, in addition, fuel gas high efficiency injection shortens jet
The jet duration can be avoided valve overlap angle, so that combustion gas be avoided to exist by adjusting jet pulsewidth and port timing by pulsewidth
Valve overlap angle is directly swept out during opening with air, improves engine economy.
High-pressure gas spraying system can work independently in multiple spot multistage low-pressure fuel gas spraying system and cylinder, and low pressure supplies mould
The reliability service that can guarantee natural gas engine under formula and under high-pressure air feed mode, realizes the redundancy of gas injection system.Together
When, collaboration gas supply may be implemented in high-pressure gas spraying system in multiple spot multistage low-pressure fuel gas spraying system and cylinder, at engine
When induction stroke, according to the different load of engine, step by step or classification work by snifting valve in control jet valve group 6, adjust
The accurate control of air-fuel ratio may be implemented in whole fuel gas supply amount.Air and natural gas are pre-mixed in air intake duct 9, in piston pump
Suction effect is lower to enter cylinder, and gaseous mixture is further mixed to form leaner uniform combustion mixture in cylinder 8.Work as engine
When in compression stroke, control high pressure fuel gas jet valve 14 sprays into a certain amount of combustion gas, fuel gas injection timing and spray into cylinder
It penetrates pulsewidth and is controlled by control system according to engine load and revolving speed, when fuel gas injection finish time and spark plug 13 are lighted a fire
It carves and approaches, can be realized 13 surrounding of spark plug, there are the combustion mixtures of suitable concentration, guarantee the stability and realization of igniting
Conflagration.In the engine exhaust stage, the control 6 fuel gas injection time of jet valve group avoids valve overlap angle, combustion gas is avoided to exist
Valve overlap angle scans out during opening with air.Pass through optimization 13 ignition timing of spark plug, the timing of high-low pressure fuel gas injection and spray
It penetrates pulsewidth and realizes engine high-efficiency burning, improve engine power performance, economy and emission performance.
When engine is in underload, in induction stroke, single snifting valve work, adjustment spray in jet valve group 6 are controlled
Pulsewidth is penetrated, so that gas flow meets present engine load requirement.Natural gas and air realize premixing in air intake duct 9,
During piston downlink, gaseous mixture is further mixed to form leaner uniform combustion mixture in cylinder 8.In engine
Compression stroke, when the piston is near the top dead centre, control high pressure fuel gas jet valve 14 spray into a small amount of combustion gas, combustion gas into cylinder 8
The amount of injection can satisfy the Weak mixture that the energy after realizing stable ignition and burning can ignite in cylinder.Pass through
Optimize 13 ignition timing of spark plug, the timing of high-low pressure fuel gas injection and injection pulse width and realizes engine high-efficiency burning.Work as engine
When being converted from underload to high load capacity, single snifting valve work first in control jet valve group 6, then gradually control multiple snifting valves
Work, adjusts the injection timing and injection pulse width of every level-one snifting valve, so that gas flow meets present engine load requirement.
Air and natural gas enter in cylinder through air intake duct 9 forms leaner homogeneous mixture.When piston motion is to close in compression
When stop, controls the high pressure into cylinder of high pressure fuel gas jet valve 14 and spray into a certain amount of natural gas, fuel gas injection amount can satisfy
The Weak mixture that energy after realizing stable ignition and burning can ignite in cylinder.13 arcing of spark plug, is lighted
The denseer combustion mixture of surrounding, then the Weak mixture for cylinder other positions of igniting, realize charge stratification work by combustion.
Claims (4)
1. a kind of natural gas engine combustion system, it is characterized in that: including engine, air accumulator, the engine includes cylinder
Lid, cylinder, piston form bath-tub type combustion chamber, air intake duct, exhaust are arranged in cylinder head between cylinder head, cylinder and piston
Road, spark plug, high pressure fuel gas jet valve install intake valve in air intake duct, exhaust valve are installed in exhaust duct, air accumulator passes through gas
Pressurizing device connects the first gas rail, and air accumulator connects the second gas rail by pressure regulator, and the first gas rail connects high pressure fuel gas jet valve,
Second gas rail connects jet valve group, and the outlet of the outlet passageway of jet valve group is located in air intake duct.
2. a kind of natural gas engine combustion system according to claim 1, it is characterized in that: jet valve group includes at least two
A snifting valve, snifting valve are installed in valve block, and share an outlet passageway.
3. a kind of natural gas engine combustion system according to claim 1 or 2, it is characterized in that: high pressure fuel gas jet valve
It is tiltedly mounted in cylinder head, spark plug is mounted on cylinder head center.
4. a kind of natural gas engine method for controlling combustion, it is characterized in that: when engine is in underload, in induction stroke,
Single snifting valve work in jet valve group is controlled, by adjusting injection pulse width, so that gas flow is met present engine load and wants
It asks；Natural gas and air realize premixing in air intake duct, and during piston downlink, gaseous mixture further mixes in cylinder
Form thin uniform combustion mixture；In engine compression strokes, when piston before top dead center when, control high-pressure gas injection
Valve sprays into combustion gas into cylinder, and the energy that control fuel gas injection amount can satisfy after realizing stable ignition and burning can ignite
Weak mixture in cylinder；When engine is converted from underload to high load capacity, single jet in jet valve group is controlled first
Valve work, then gradually control the work of two or more snifting valves, by adjusting every level-one snifting valve injection timing and
Injection pulse width, so that gas flow meets present engine load requirement；When before piston motion to compression top center, control
High pressure fuel gas jet valve high pressure into cylinder sprays into natural gas, and control fuel gas injection amount, which can satisfy, realizes stable ignition and combustion
The Weak mixture that energy after burning can ignite in cylinder；Spark plug sparking lights concentration of the surrounding relative to other positions
More denseer combustion mixture, then the Weak mixture for cylinder other positions of igniting realize charge stratification work by combustion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910559235.7A CN110318910A (en) | 2019-06-26 | 2019-06-26 | A kind of natural gas engine combustion system and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910559235.7A CN110318910A (en) | 2019-06-26 | 2019-06-26 | A kind of natural gas engine combustion system and control method |
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| CN110318910A true CN110318910A (en) | 2019-10-11 |
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| CN201910559235.7A Pending CN110318910A (en) | 2019-06-26 | 2019-06-26 | A kind of natural gas engine combustion system and control method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110905652A (en) * | 2019-12-20 | 2020-03-24 | 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 |
| CN111305977A (en) * | 2020-02-18 | 2020-06-19 | 哈尔滨工程大学 | Hydrogen natural gas full-proportion variable dual-fuel engine |
| CN111456858A (en) * | 2020-02-18 | 2020-07-28 | 哈尔滨工程大学 | Natural gas engine fuel gas injection method based on' previous cycle effect |
| CN112814808A (en) * | 2021-01-07 | 2021-05-18 | 中国第一汽车股份有限公司 | Double-injection system of gas fuel engine and control method thereof |
| CN113775447A (en) * | 2021-09-13 | 2021-12-10 | 安庆福莱克斯动力科技有限公司 | Jet engine in cylinder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110905652A (en) * | 2019-12-20 | 2020-03-24 | 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 |
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| CN111456858A (en) * | 2020-02-18 | 2020-07-28 | 哈尔滨工程大学 | Natural gas engine fuel gas injection method based on' previous cycle effect |
| CN111456858B (en) * | 2020-02-18 | 2022-03-18 | 哈尔滨工程大学 | Natural gas engine fuel gas injection method based on' previous cycle effect |
| CN112814808A (en) * | 2021-01-07 | 2021-05-18 | 中国第一汽车股份有限公司 | Double-injection system of gas fuel engine and control method thereof |
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| CN113775447A (en) * | 2021-09-13 | 2021-12-10 | 安庆福莱克斯动力科技有限公司 | Jet engine in cylinder |
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Application publication date: 20191011 |