CN110821650A - A dual-fuel ignition chamber type two-stroke engine and combustion control method - Google Patents
A dual-fuel ignition chamber type two-stroke engine and combustion control method Download PDFInfo
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- CN110821650A CN110821650A CN201810937290.0A CN201810937290A CN110821650A CN 110821650 A CN110821650 A CN 110821650A CN 201810937290 A CN201810937290 A CN 201810937290A CN 110821650 A CN110821650 A CN 110821650A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 54
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- 238000007906 compression Methods 0.000 claims description 27
- 238000005516 engineering process Methods 0.000 claims description 11
- 239000002283 diesel fuel Substances 0.000 claims description 6
- 238000005485 electric heating Methods 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
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- 230000009977 dual effect Effects 0.000 claims description 2
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
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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
- 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
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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
- F02B19/1019—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder with only one pre-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
- F02B19/00—Engines characterised by precombustion chambers
- F02B19/12—Engines characterised by precombustion chambers with positive 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
- 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
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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
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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
- F02D41/02—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
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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
- F02D41/3094—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
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- 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
- F02F1/00—Cylinders; Cylinder heads
- F02F1/004—Cylinder liners
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- 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
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/242—Arrangement of spark plugs or injectors
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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
- 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
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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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- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
The invention provides a dual-fuel ignition chamber type two-stroke engine and a combustion control method, and belongs to the field of combustion of internal combustion engines. The method comprises the following steps that a first main fuel nozzle of a cylinder cover is arranged on the cylinder cover, or a first main fuel nozzle of a cylinder sleeve is arranged on the cylinder cover, and a second main fuel nozzle of the cylinder cover is arranged on the cylinder cover, or a second main fuel nozzle of the cylinder sleeve is arranged on the cylinder sleeve; an ignition chamber is arranged on the cylinder cover, and a second fuel nozzle and a spark plug of the ignition chamber are arranged on the ignition chamber. The ignition chamber is connected with the combustion chamber through a channel, and after the mixed gas in the ignition chamber is ignited by the spark plug, the engine is triggered to ignite in a flame jet mode. Under the condition that the cylinder cover and the cylinder sleeve are simultaneously provided with the main fuel nozzle, the main fuel nozzle of the cylinder cover is used for supplying fuel during low load, so that the heat efficiency is improved; during medium load, the cylinder sleeve main fuel nozzle supplies fuel to reduce the generation of NOx; at high load, both the cylinder liner nozzle and the cylinder head nozzle of the main fuel supply fuel to control knocking. And high-efficiency clean combustion in all working condition ranges is realized.
Description
Technical Field
The invention relates to a dual-fuel ignition chamber type two-stroke engine and a combustion control method, and belongs to the field of combustion of internal combustion engines.
Background
In order to reduce the emission, the current efforts are made to increase the rarefied degree of the mixture in the engine cylinder, and the ignition effect of the spark plug is poor, especially, the ignition effect of the spark plug is worse along with the increase of the cylinder diameter. There are problems that cold start is difficult and HC and CO emissions are high under low load conditions.
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 premixed compression ignition is affected by environmental conditions and engine operating conditions and is difficult to control reliably. 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 ignition chamber type two-stroke engine and a combustion control method. Through the measures of arranging the ignition chamber, two kinds of fuel cylinder sleeve nozzles and cylinder cover nozzles, adjusting injection strategies and the like, the efficient clean combustion of the ignition chamber type two-stroke engine within the full working condition range is realized.
The technical scheme adopted by the invention is as follows: a dual-fuel ignition chamber type two-stroke engine comprises a scavenging port, an exhaust passage and a combustion chamber, wherein a cylinder cover is provided with a first main fuel nozzle of a cylinder cover and/or a cylinder sleeve is provided with a first main fuel nozzle of a cylinder sleeve, and the cylinder cover is provided with a second main fuel nozzle of the cylinder cover and/or the cylinder sleeve is provided with a second main fuel nozzle of the cylinder sleeve; an ignition chamber is arranged on the cylinder cover, a second fuel nozzle of the ignition chamber and a spark plug are arranged on the ignition chamber, and the ignition chamber is connected with the combustion chamber through a channel; the ignition mode of the engine is that a spark plug ignites the mixed gas in the ignition chamber, and the flame jet rich in active base is sprayed into the combustion chamber from the channel to trigger the combustion of the fuel in the cylinder.
Further, the ignition chamber structure is designed according to the arrangement condition of a cylinder cover, and the volume of the ignition chamber is not more than 5% of the clearance volume; the number of the channels of the ignition chamber and the combustion chamber is at least 1, the cross section of the channel is circular or the inlet is a circular outlet and is in a narrow slit shape, an oval shape or a round corner rectangle with a small area, and the longitudinal section of the channel adopts a straight cylinder shape, a tapered shape, a gradually expanded shape or a gradually contracted and gradually expanded shape or the combination of the shapes.
Further, the ignition chamber and two kinds of cylinder cover main fuel nozzles are arranged on the side face, the number of the cylinder cover main fuel nozzles is at least 2, the arrangement positions of the two kinds of cylinder cover main fuel nozzles are determined according to fuel density, the two kinds of cylinder cover main fuel nozzles are arranged on the upper portion of the cylinder sleeve when the fuel density is larger than air, the two kinds of cylinder cover main fuel nozzles are arranged in the middle portion of the cylinder sleeve when the fuel density is smaller than air, and the number of the cylinder cover main fuel nozzles is at least.
Further, the ignition chamber, 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 heat insulation coatings, or the ignition chamber and the top of the piston are selected from heat insulation materials, and/or an electric heating device is arranged on the ignition chamber.
Further, variable valve technology is employed and/or exhaust gas recirculation technology is employed.
Further, when the main fuel is diesel oil, ethers, or mixed fuel containing diesel oil, or mixed fuel containing ethers, the fuel nozzle can only select a cylinder head fuel nozzle, the compression ratio is set to a critical compression ratio at which the main fuel cannot be directly compression-ignited, and the premixed compression ignition is performed.
A combustion control method for a dual-fuel ignition chamber type two-stroke engine is characterized in that under the condition that a cylinder cover and a cylinder sleeve are simultaneously provided with a main fuel nozzle easy to atomize, the compression ratio of the engine is set to be a critical compression ratio at which main fuel cannot be directly compressed and ignited, and a premixed compression ignition mode of flame jet ignition of an ignition chamber is adopted. Or, the following control is carried out according to the working condition size:
at low load, using a cylinder cover main fuel nozzle to supply fuel;
at medium load, using a cylinder liner fuel nozzle to supply fuel;
at high loads, fuel is supplied using the cylinder liner main fuel nozzle and the cylinder head main fuel nozzle.
During cold starting, the variable valve technology is adopted to improve the compression ratio and/or an electric heating device is used for preheating the ignition chamber, and main fuel is injected into the ignition chamber for ignition.
The second main fuel nozzle of the ignition chamber can spray for multiple times, when in early injection, the pressure of the second main fuel sprayed in the ignition chamber is greater than the pressure in the combustion chamber, the second main fuel enters the cylinder through a channel of the ignition chamber, and the second main fuel sprayed in the later period is remained in the ignition chamber; the fuel in the ignition chamber consists of two parts, one part is the fuel pressed into the ignition chamber by the combustion chamber through the channel, and the other part is the fuel injected by the second main fuel nozzle of the ignition chamber.
The invention has the beneficial effects that: the flame jet of the ignition chamber of the dual-fuel ignition chamber type two-stroke engine can control the pre-mixing compression ignition phase, further improve the ignition performance and realize rapid combustion. The engine carries out the injection strategy under different working conditions under the condition that the cylinder cover and the cylinder sleeve are simultaneously provided with the main fuel nozzle which is easy to atomize, different combustion modes are realized, the critical compression ratio can be set, and a premixing compression ignition mode of flame jet ignition of an ignition chamber is adopted. 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 block diagram of a two-stroke engine of the dual fuel firing chamber type.
In the figure: 1. scavenging port, 2, exhaust passage, 3, combustion chamber, 4, cylinder sleeve first main fuel nozzle, 5, cylinder sleeve second main fuel nozzle, 6, cylinder cover first main fuel nozzle, 7, cylinder cover second main fuel nozzle, 8, ignition chamber, 9, ignition chamber second fuel nozzle, 10 and 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. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not 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.
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings in which:
example 1:
as shown in fig. 1, a dual-fuel ignition chamber type two-stroke engine comprises a scavenging port 1, an exhaust passage 2 and a combustion chamber 3, wherein a cylinder cover first main fuel nozzle 6 is arranged on a cylinder cover and/or a cylinder sleeve first main fuel nozzle 4 is arranged on the cylinder cover, and a cylinder cover second main fuel nozzle 7 is arranged on the cylinder cover and/or a cylinder sleeve second main fuel nozzle 5 is arranged on the cylinder sleeve; an ignition chamber 8 is arranged on the cylinder cover, a second fuel nozzle 9 of the ignition chamber and a spark plug 10 are arranged on the ignition chamber 8, and the ignition chamber 8 is connected with the combustion chamber 3 through a channel; the ignition mode of the engine is that a spark plug 10 ignites the mixed gas in the ignition chamber 8, and flame jet rich in active base is sprayed into the combustion chamber 3 from the channel to trigger the combustion of fuel in a cylinder.
The structure of the ignition chamber 8 is designed according to the arrangement condition of a cylinder cover, and the volume of the ignition chamber 8 is not more than 5% of the clearance volume; the number of the channels of the ignition chamber 8 and the combustion chamber 3 is at least 1, the cross section of the channel is circular or the inlet is a circular outlet and is in a narrow slit shape, an oval shape or a round corner rectangle with a small area, and the longitudinal section of the channel adopts a straight cylinder shape, a tapered shape, a gradually expanded shape or a gradually contracted and gradually expanded shape or the combination of the shapes.
The ignition chamber 8 and two kinds of cylinder cap main fuel nozzle set up in the side, cylinder cap main fuel nozzle number is 2 at least, and two kinds of cylinder jacket main fuel nozzle's setting position is confirmed according to fuel density, sets up on cylinder jacket upper portion when fuel density is greater than the air, sets up in the cylinder jacket middle part when fuel density is less than the air, the number of cylinder jacket main fuel nozzle is 2 at least.
The ignition chamber 8, the bottom of the cylinder cover, the bottom of the air valve, the top surface of the piston, the firepower bank and the upper part of the cylinder sleeve which can not be contacted by the piston ring are sprayed with heat insulation coatings, or the ignition chamber 8 and the top of the piston are selected from heat insulation materials, so that the heat transfer loss is reduced, the heat efficiency of the engine is further improved, and/or an electric heating device is arranged on the ignition chamber 8, stable ignition is realized during cold start, ignition can also be realized under the condition exceeding the conventional combustion limit, the combustion rate in the ignition chamber 8 is accelerated, and the flame injection energy 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.
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 the cylinder cover fuel nozzle, the compression ratio is set to the critical compression ratio that the main fuel can not be directly compressed to ignite, and the premixed compression ignition is carried out.
The engine is provided with two main fuel nozzles which are easy to atomize on a cylinder cover and a cylinder sleeve, and the injection strategies under different working conditions are carried out to realize different combustion modes. Or the following control is carried out according to the working condition:
and at the time of low load, fuel is supplied by using a cylinder cover main fuel nozzle, and layered mixed gas is formed in the cylinder, so that rapidness and sufficiency are realized, and emission of HC and CO is reduced.
And in medium load, a cylinder sleeve fuel nozzle is used for supplying fuel, so that relatively homogeneous lean mixed gas is formed in the cylinder, rapid combustion is realized, and NOx emission is reduced.
And at high load, the cylinder sleeve main fuel nozzle and the cylinder cover main fuel nozzle are used for supplying fuel, relatively homogeneous premixed gas is formed in the cylinder, and the auxiliary cylinder cover main fuel nozzle is used for supplying fuel near a compression top dead center, so that knocking is inhibited, and stable and efficient clean combustion is completed.
During cold starting, the compression ratio is improved by adopting a variable valve technology, so that the mixed gas in the ignition chamber is easier to ignite, and/or the ignition chamber 8 is preheated by an electric heating device on the ignition chamber 8, and main fuel is injected into the ignition chamber 8 for ignition.
The second fuel nozzle 9 of the ignition chamber can inject for a plurality of times, when injecting in early stage, the pressure of the second fuel injected into the ignition chamber is larger than the pressure in the combustion chamber, and the second fuel enters the cylinder through a channel of the ignition chamber; the post-injected second fuel remains in the ignition chamber 8.
The fuel in the ignition chamber 8 consists of two parts, one part is the fuel pressed into the ignition chamber by the combustion chamber through a channel, and the other part is the fuel injected by the second fuel nozzle 9 of the ignition chamber. In the embodiment, the main fuels are methanol and natural gas, and the two-stroke engine is researched, so that compared with the original engine, the thermal efficiency is improved by 8%, the nitrogen oxide is reduced by 85%, and the particulate matter emission is reduced by 95%. Other embodiments of the invention can also achieve the effect of efficient clean combustion.
Example 2: different from embodiment 1, the cylinder liner first main fuel nozzle 4 is reduced, and the cylinder head first main fuel nozzle 6, the cylinder head second main fuel nozzle 7 and the cylinder liner second main fuel nozzle 5 inject the main fuel, so that the high-efficiency clean combustion is realized.
Example 3: unlike embodiment 1, the cylinder head first main fuel nozzle 6 is reduced, and the cylinder head second main fuel nozzle 5 and the cylinder head second main fuel nozzle 7 inject the main fuel through the cylinder head first main fuel nozzle 4, thereby achieving efficient clean combustion.
Example 4: unlike embodiment 1, the cylinder liner first main fuel nozzle 4 and the cylinder head second main fuel nozzle 7 are reduced, and the main fuel is injected through the cylinder liner second main fuel nozzle 5 and the cylinder head first main fuel nozzle 6, so that 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 flame jet ignition of the ignition chamber is adopted for high-efficiency 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)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2018108873108 | 2018-08-07 | ||
| CN201810887310 | 2018-08-07 |
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| CN110821650A true CN110821650A (en) | 2020-02-21 |
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Citations (15)
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| CN1782339A (en) * | 2004-12-03 | 2006-06-07 | 卡特彼勒公司 | Distributed ignition method and apparatus for internal combustion engine |
| CN102278240A (en) * | 2011-06-08 | 2011-12-14 | 清华大学 | Method and device for reducing oil consumption of diesel engine by utilizing catalytic decomposition of oxygen-containing fuels |
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