CN110821666A - Dual-fuel spark plug type four-stroke engine and combustion control method - Google Patents

Dual-fuel spark plug type four-stroke engine and combustion control method Download PDF

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Publication number
CN110821666A
CN110821666A CN201810937289.8A CN201810937289A CN110821666A CN 110821666 A CN110821666 A CN 110821666A CN 201810937289 A CN201810937289 A CN 201810937289A CN 110821666 A CN110821666 A CN 110821666A
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CN
China
Prior art keywords
fuel
spark plug
cylinder
nozzle
stroke engine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810937289.8A
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Chinese (zh)
Inventor
隆武强
田华
崔靖晨
王洋
曹建林
张恒
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Dalian University of Technology
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Dalian University of Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to CN201810887352 priority Critical
Priority to CN2018108873521 priority
Application filed by Dalian University of Technology filed Critical Dalian University of Technology
Publication of CN110821666A publication Critical patent/CN110821666A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00Other engines
    • F02B75/02Engines characterised by their cycles, e.g. six-stroke
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B69/00Internal-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
    • F02B69/02Internal-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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/30Controlling fuel injection
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00Cylinders; Cylinder heads 
    • F02F1/24Cylinder heads
    • F02F1/242Arrangement of spark plugs or injectors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00Pistons 
    • F02F3/10Pistons  having surface coverings
    • F02F3/12Pistons  having surface coverings on piston heads
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00Other engines
    • F02B75/02Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/027Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four

Abstract

The invention provides a dual-fuel spark plug type four-stroke engine and a combustion control method, and belongs to the field of combustion of internal combustion engines. Arranging a first fuel nozzle for direct injection in a cylinder on a cylinder cover and/or arranging a first fuel nozzle for an air inlet channel on the air inlet channel, and arranging a second fuel nozzle for direct injection in the cylinder on the cylinder cover and/or arranging a second fuel nozzle for the air inlet channel on the air inlet channel; the cylinder cover is provided with a spark plug. Under the condition that a cylinder cover and an air inlet channel are simultaneously provided with a main fuel nozzle, the in-cylinder direct injection main fuel nozzle is used for supplying fuel during low load, so that the heat efficiency is improved; during medium load, the main fuel nozzle of the air inlet channel supplies fuel to reduce the generation of NOx; at high load, both the intake port nozzle and the in-cylinder direct injection nozzle of the main fuel supply fuel to control knocking. And high-efficiency clean combustion in all working condition ranges is realized.

Description

Dual-fuel spark plug type four-stroke engine and combustion control method
Technical Field
The invention relates to the technical field of combustion of internal combustion engines, in particular to a dual-fuel spark plug type four-stroke engine and a combustion control method.
Background
Energy and environmental issues are becoming more prominent, and low temperature combustion of premixed compression ignition can improve the thermal efficiency of the engine and reduce NOx emissions. However, the ignition timing of the premixed compression ignition is affected by environmental conditions and engine working conditions, and reliable and accurate control is difficult to achieve. In addition, the working condition range is small, excessive HC and CO can be generated in cold start and low load, and knocking can be generated in high load.
The engine with single fuel is difficult to meet the requirement of energy diversification, and the combustion characteristic of the single fuel has limitation, so that the performance improvement of the engine is limited.
Therefore, it is necessary to provide a new engine structure to solve the above problems.
Disclosure of Invention
The invention discloses a dual-fuel spark plug type four-stroke engine and a combustion control method. Through the measures of arranging two main fuel air inlet nozzles and an in-cylinder direct injection nozzle, adjusting injection strategies and the like, the efficient clean combustion of the spark plug type four-stroke engine in all working condition ranges is realized.
The technical scheme adopted by the invention is as follows: the utility model provides a dual fuel spark plug formula four-stroke engine, includes intake duct, exhaust passage and combustion chamber, its characterized in that: arranging a first fuel nozzle for direct injection in a cylinder on a cylinder cover and/or arranging a first fuel nozzle for an air inlet channel on the air inlet channel, and arranging a second fuel nozzle for direct injection in the cylinder on the cylinder cover and/or arranging a second fuel nozzle for the air inlet channel on the air inlet channel; the cylinder cover is provided with a spark plug.
And the bottom of the cylinder cover, the bottom of the air valve, the top surface of the piston, the fire bank and the upper part of the cylinder sleeve which can not be contacted by the piston ring are sprayed with a heat insulation coating, or the top of the piston is selected from a heat insulation material.
Variable valve technology is employed.
Exhaust gas recirculation technology is used.
The number of the main fuel intake port nozzles and/or the in-cylinder direct injection nozzles is at least 1.
The spark plug may be replaced with a plasma torch.
When the main fuel is diesel oil, ether, or mixed fuel containing diesel oil or mixed fuel containing ether, the fuel nozzle can only select an in-cylinder direct injection nozzle, the compression ratio is set to be a critical compression ratio at which the main fuel can not be directly compressed to ignite, and the premixed compression ignition is carried out.
The engine is provided with a main fuel nozzle which is easy to atomize on a cylinder cover and an air inlet channel, the compression ratio is set as the critical compression ratio that the main fuel can not be directly compressed and ignited, and a premixed compression ignition mode of spark plug ignition is adopted. Or, the following control is carried out according to the working condition size:
at low load, fuel is supplied by using a direct injection fuel nozzle;
at medium load, fuel is supplied by using a fuel nozzle of an air inlet channel;
at high loads, fuel is supplied using a port fuel injector and an in-cylinder direct injection fuel injector.
Setting critical compression ratio, and adopting a premixed compression ignition mode of spark plug ignition.
During cold start, the compression ratio is improved by adopting a variable valve technology, and main fuel is injected into a combustion chamber for ignition.
The invention has the beneficial effects that: the dual-fuel spark plug type four-stroke engine is provided with the main fuel nozzle which is easy to atomize on the cylinder cover and the air inlet channel simultaneously, and the injection strategies under different working conditions are carried out to realize different combustion modes. Thereby realizing high-efficiency clean combustion in all working condition ranges.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 shows a construction of a dual fuel spark plug type four-stroke engine.
In the figure: 1. intake port, 2, exhaust port, 3, combustion chamber, 4, intake port first fuel injector, 5, intake port second fuel injector, 6, in-cylinder direct injection first fuel injector, 7, in-cylinder direct injection second fuel injector, 8, spark plug.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
As shown in fig. 1, the engine includes an intake passage 1, an exhaust passage 2, and a combustion chamber 3, and is characterized in that a first intake-passage fuel injector 4 and a second intake-passage fuel injector 5 are provided in the intake passage 1, and a first in-cylinder direct injection fuel injector 6, a second in-cylinder direct injection fuel injector 7, and a spark plug 8 are provided in a cylinder head.
The combustion chamber 3 is sprayed with a heat insulation coating or a heat insulation material, namely the bottom of a cylinder cover, the bottom of an air valve, the top surface of a piston, a firepower bank and the upper part of a cylinder sleeve which can not be contacted by a piston ring are sprayed with the heat insulation coating or the top of the piston is sprayed with the heat insulation material, so that the heat transfer loss in the cylinder is reduced, and the heat efficiency of an engine is improved.
Variable valve technology is adopted to realize variable compression ratio.
And the combustion speed of the fuel in the cylinder is controlled by adopting an exhaust gas recirculation technology.
The number of the main fuel intake port nozzles and/or the in-cylinder direct injection nozzles is at least 1.
The spark plug 8 may be replaced with a plasma torch.
When the main fuel is diesel oil, ether, or mixed fuel containing diesel oil or mixed fuel containing ether, the fuel nozzle can only select an in-cylinder direct injection nozzle, the compression ratio is set to be a critical compression ratio at which the main fuel can not be directly compressed to ignite, and the premixed compression ignition is carried out.
Example 1:
the engine is provided with a main fuel nozzle which is easy to atomize on a cylinder cover and an air inlet channel, the compression ratio is set as the critical compression ratio that the main fuel can not be directly compressed and ignited, and a premixed compression ignition mode of spark plug ignition is adopted. Or, the following control is carried out according to the working condition size:
at the time of low load, fuel is supplied from an in-cylinder direct injection nozzle using main fuel, stratified mixture from the inside to the outside around the ignition plug 8 is formed in the cylinder, and the ignition plug 8 ignites the mixture in the vicinity thereof, thereby achieving rapid combustion and reducing the emission of HC and CO.
At medium load, fuel is supplied from an inlet nozzle of the main fuel to form a relatively homogeneous lean air-fuel mixture in the cylinder, and the air-fuel mixture in the vicinity of the lean air-fuel mixture is ignited by the spark plug 8 to realize rapid combustion and reduce NOx emission.
At high load, fuel is supplied from an intake port nozzle using main fuel, a relatively homogeneous premixed gas is formed in the cylinder, the premixed gas in the vicinity thereof is ignited by a spark plug 8, and the fuel is supplied from an in-cylinder direct injection nozzle which assists the main fuel in the vicinity of a compression top dead center, whereby knocking is suppressed and stable and efficient clean combustion is completed.
At the time of cold start, the compression ratio is increased by using a variable valve technology, and main fuel is injected into the combustion chamber 3 to be ignited.
In the embodiment, the main fuels are methanol and natural gas, and the research is carried out on a four-stroke engine, compared with the original engine, the thermal efficiency is improved by 10%, the nitrogen oxide is reduced by 70%, the particulate matter emission is reduced by 95%, the hydrocarbon emission is reduced by 45%, and the carbon monoxide emission is reduced by 40%. Other embodiments of the invention can also achieve the effect of efficient clean combustion.
Example 2: unlike embodiment 1, the first fuel injector 4 of the intake port is reduced, and the fuel is injected by the first fuel injector 6 of direct in-cylinder injection, the second fuel injector 7 of direct in-cylinder injection, and the second fuel injector 5 of the intake port, so that the efficient clean combustion is realized.
Example 3: unlike embodiment 1, the number of direct-injection main fuel injectors 6 is reduced, and fuel is injected through the intake port first fuel injector 4, the intake port second fuel injector 5, and the direct-injection second fuel injector 7, so that efficient clean combustion is achieved.
Example 4: unlike embodiment 1, the intake port first fuel injection nozzle 4 and the in-cylinder direct injection second fuel injection nozzle 7 are reduced, and fuel is injected through the intake port second fuel injection nozzle 5 and the in-cylinder direct injection first fuel injection nozzle 6, whereby efficient clean combustion is achieved.
Example 5: different from the embodiments 1-4, the variable valve technology and the exhaust gas recirculation technology are adopted, the critical compression ratio is set, so that the mixed gas is in the critical state which can not be directly compressed and is close to compressed and ignited, and the premixed compression ignition mode of spark plug ignition is adopted for efficient and clean combustion.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (9)

1. The utility model provides a dual fuel spark plug formula four-stroke engine, includes intake duct (1), exhaust passage (2) and combustion chamber (3), its characterized in that: arranging a first fuel nozzle (6) for direct injection in a cylinder on a cylinder cover and/or arranging a first fuel nozzle (4) for an air inlet channel on the air inlet channel (1), and arranging a second fuel nozzle (7) for direct injection in the cylinder cover and/or arranging a second fuel nozzle (5) for the air inlet channel (1); the cylinder head is provided with a spark plug (8).
2. A dual fuel spark plug type four stroke engine according to claim 1, wherein: and the bottom of the cylinder cover, the bottom of the air valve, the top surface of the piston, the fire bank and the upper part of the cylinder sleeve which can not be contacted by the piston ring are sprayed with a heat insulation coating, or the top of the piston is selected from a heat insulation material.
3. A dual fuel spark plug type four stroke engine according to claim 1, wherein: variable valve technology is employed.
4. A dual fuel spark plug type four stroke engine according to claim 1, wherein: exhaust gas recirculation technology is used.
5. A dual fuel spark plug type four stroke engine according to claim 1, wherein: the number of the main fuel intake port nozzles and/or the in-cylinder direct injection nozzles is at least 1.
6. A dual fuel spark plug type four stroke engine according to claim 1, wherein: the spark plug (8) may be replaced by a plasma torch.
7. A dual fuel spark plug type four stroke engine according to claim 1, wherein: when the main fuel is diesel oil, ether, or mixed fuel containing diesel oil or mixed fuel containing ether, the fuel nozzle can only select an in-cylinder direct injection nozzle, the compression ratio is set to be a critical compression ratio at which the main fuel can not be directly compressed to ignite, and the premixed compression ignition is carried out.
8. A combustion control method of a dual-fuel spark plug type four-stroke engine is characterized in that: the engine is provided with a main fuel nozzle which is easy to atomize on a cylinder cover and an air inlet channel, the compression ratio is set as the critical compression ratio that the main fuel can not be directly compressed and ignited, and a premixed compression ignition mode of spark plug ignition is adopted. Or, the following control is carried out according to the working condition size:
at low load, fuel is supplied by using a direct injection fuel nozzle;
at medium load, fuel is supplied by using a fuel nozzle of an air inlet channel;
at high loads, fuel is supplied using a port fuel injector and an in-cylinder direct injection fuel injector.
9. The combustion control method of a dual-fuel spark plug type four-stroke engine according to claim 8, characterized in that: during cold start, the compression ratio is improved by adopting a variable valve technology, and main fuel is injected into the combustion chamber (3) for ignition.
CN201810937289.8A 2018-08-07 2018-08-16 Dual-fuel spark plug type four-stroke engine and combustion control method Pending CN110821666A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201810887352 2018-08-07
CN2018108873521 2018-08-07

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CN110821666A true CN110821666A (en) 2020-02-21

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CN107781026A (en) * 2017-09-22 2018-03-09 大连理工大学 Spark ignitor formula internal combustion engine homogeneous charge compression ignition system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102472177A (en) * 2009-09-30 2012-05-23 株式会社日立制作所 Engine system with reformer
CN102635437A (en) * 2011-02-10 2012-08-15 曼柴油机和涡轮机欧洲股份公司 A two-stroke internal combustion engine and a method for making the engine work
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