CN110206641A - Compression ignition engine and its method for realizing low temperature combustion mode - Google Patents
Compression ignition engine and its method for realizing low temperature combustion mode Download PDFInfo
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- CN110206641A CN110206641A CN201910353061.9A CN201910353061A CN110206641A CN 110206641 A CN110206641 A CN 110206641A CN 201910353061 A CN201910353061 A CN 201910353061A CN 110206641 A CN110206641 A CN 110206641A
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- exhaust gas
- water
- admission line
- compress cell
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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
- F02B47/00—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines
- F02B47/02—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines the substances being water or steam
-
- 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
- F02B47/00—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines
- F02B47/04—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines the substances being other than water or steam only
- F02B47/08—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines the substances being other than water or steam only the substances including exhaust 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
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/022—Adding fuel and water emulsion, water or steam
- F02M25/025—Adding water
- F02M25/028—Adding water into the charge intakes
-
- 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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
-
- 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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
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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
Abstract
A kind of compression ignition engine and its method for realizing low temperature combustion mode, it include: that step A obtains the second pressure difference before the first pressure difference and compress cell heel row feed channel and compress cell after compress cell front exhaust pipeline and compress cell between admission line between admission line；If step B judges that the first pressure difference is positive, exhaust gas is introduced in air inlet using high pressure exhaust gas egr mode until realizing low-temperature burning, and low-temperature burning is also not implemented when the first pressure difference is decreased to 0, thens follow the steps one of C1 or C2；If the first pressure difference of judgement is negative, directly one of execution step C1 or C2；Step C1 introduces exhaust gas until realizing low-temperature burning using low pressure exhaust gas egr mode in air inlet, and low-temperature burning is also not implemented when the second pressure difference is decreased to 0, then water is introduced in air inlet, and water diversion is gradually increased until realizing low-temperature burning；Step C2 introduces water in air inlet, and water diversion is gradually increased until realizing low-temperature burning.
Description
Technical field
The present invention relates to field of internal combustion engine, in particular to a kind of compression ignition engine and its side for realizing low temperature combustion mode
Method.
Background technique
Conventional diesel combustion belongs to the diffusion combustion of spray burning, when by engine piston compresses to close to terminal
High temperature makes gaseous mixture involuntary ignition.Due to spraying very short with the incorporation time of air, fuel oil is mixed with air serious uneven,
It is divided into high temperature overrich area and thermal-flame area when mixture combustion.In high temperature overrich area, since anoxic will cause a large amount of soots
It generates, part of soot is oxidized during then.Thermal-flame area oxygen amount is sufficient and temperature is finally led up to 2200K
Cause a large amount of NOxIt generates.Therefore, soot and NO in conventional diesel combustionxIt discharges almost inevitable.In recent years, under the pressure of the energy,
Pressure of both environment, scientific research personnel constantly pursue the combustion system of high-efficiency cleaning, and wherein low temperature combustion mode is exactly a kind of
New combustion mode.Equivalent proportion-temperature history curve avoids the NO for passing through soot in low temperature combustion modexFormation zone make
Noxious emission discharge is obtained close to 0, meanwhile, the temperature of working medium is lower in low temperature combustion mode reduces wall surface heat output, makes
Obtain its thermal efficiency with higher.Low temperature combustion mode, which has, realizes the potentiality of high-efficiency cleaning burning in sub-load.
Although low temperature combustion mode be it is a kind of have very much a promising combustion mode, this combustion mode at present there is also
Following defect:
1, from the point of view of the technological means for realizing chilling process, exhaust gas recycling (EGR) technology is to realize that low-temperature burning is main
One of technology of use can obtain simultaneously by reasonably using big EGR rate and inhibit NOxWith the effect of Soot Formation.Exhaust gas
Require the pressure of exhaust pipe greater than the pressure of air inlet pipe from entering in cylinder in exhaust pipe, and it is difficult on real engine
To realize the ER EGR Rate of large scale, need to recycle low pressure exhaust gas and the methods of high pressure exhaust gas recycling combined use
It is just able to achieve the ER EGR Rate of large scale, wherein low pressure exhaust gas recycling and high pressure exhaust gas recycling are that basis takes gas position
The two ways of exhaust gas is introduced in air inlet, low pressure exhaust gas recycling is that exhaust gas is drawn from turbine rear exhaust pipeline to booster
Compressor before admission line, high pressure exhaust gas recycling, which refers to from the turbine front exhaust pipeline of booster, draws exhaust gas to calming the anger
Admission line after machine.
2, the operating load of low temperature combustion mode is limited.According to the literature, having in the prior art will on a single cylinder engine
Diesel oil at low-temperature combustion mode is expanded to mean indicated pressure (MIP 1.1MPa load, and the mean indicated pressure of the external characteristics of diesel engine
Power is generally in 2~3MPa or so.Therefore, low temperature combustion mode is only confined in middle Smaller load, expands the fortune of low temperature combustion mode
Row load is also one of research direction of academia.
Low temperature combustion mode is being difficult to there are two the reason of expanding operating load on real engine: (1) with load
It improves, the fuel on the one hand entered in cylinder increases, in order to guarantee that efficiency of combustion does not theoretically allow excessive exhaust gas to enter in cylinder
Substitute fresh air；The pressure of the still further aspect exhaust pipe of engine and the pressure of air inlet pipe are gradually reduced, and high pressure exhaust gas follows again
Ring can not gradually introduce exhaust gas, and will lead to exhaust back pressure raising, engine fuel economy using low pressure exhaust gas recycling merely
Property reduce, therefore the EGR of large scale can not be introduced；(2) with the raising of engine load, increase into the energy in cylinder, cylinder
Interior temperature constantly increases, and the boundary temperature of burning increases, while can not introduce enough exhaust gas dilution air, the delay period of diesel oil
Too short, fuel shortage with fresh air to be mixed, the relatively high generation area that can pass through soot of equivalent in combustion
Domain is also easier to reach NOxFormation zone, it is difficult to realize soot and NOxLow emission.
Summary of the invention
In view of this, the main purpose of the present invention is to provide a kind of compression ignition engine and its realizing low temperature combustion mode
Method, at least be partially solved at least one of above-mentioned the technical issues of referring to.
Above-mentioned purpose of the invention is achieved through the following technical solutions:
As one aspect of the present invention, a kind of method that compression ignition engine realizes low temperature combustion mode, step are provided
A: it obtains on a compression ignition engine including engine body, admission line, exhaust pipe and compress cell in exhaust pipe
The first pressure difference between road and admission line, and the second pressure difference between exhaust pipe and admission line；Wherein, it is described into
Feed channel is used to provide air inlet to the engine body, and the exhaust pipe is used for the exhaust gas for generating the engine body
Discharge and the compress cell are set between the exhaust pipe and admission line, for recycling the exhaust gas of discharge
Heat and improve admission pressure；
Step B: judging whether first pressure difference is positive, if it is
Using high pressure exhaust gas egr mode from after the exhaust pipe extraction exhaust gas to compress cell before the compress cell
Admission line, to introduce exhaust gas in air inlet until realizing low temperature combustion mode, and be gradually decrease to 0 when first pressure difference
When also be not implemented low temperature combustion mode, then select execution step a C1 or C2；
Judge whether first pressure difference is negative, if it is
Directly select execution step a C1 or C2；
Step C1: exhaust gas is drawn to pressurization from the admission line after the compress cell using low pressure exhaust gas egr mode
Admission line before unit, to introduce exhaust gas in air inlet until realizing low temperature combustion mode, and work as second pressure difference gradually
It is decreased to that low temperature combustion mode is also not implemented when 0, then introduces water in air inlet, and water diversion is gradually increased until realizing low temperature combustion
Burning mode；
Step C2: introducing water in air inlet, and water diversion is gradually increased until realizing low temperature combustion mode.
As another aspect of the present invention, a kind of compression ignition engine for realizing low temperature combustion mode, the pressure are provided
Combustion engine includes that engine body, admission line, exhaust pipe, compress cell, low pressure exhaust gas recirculation conduit, high pressure are useless
Gas recirculation conduit, water spray unit and electronic control unit, in which:
Admission line, output end are connected to the engine body, for providing air inlet to the engine body；
Exhaust pipe, input terminal are connected to the engine body, the exhaust gas for generating the engine body
Discharge；
Compress cell is set between exhaust pipe and admission line, for recycling the useless of the engine body output
The heat of gas, and improve admission pressure；
Low pressure exhaust gas recirculation conduit, input terminal are connected to the exhaust pipe after the compress cell, output end connection
To the admission line before the compress cell, it is automatically controlled that low pressure exhaust gas recycling is provided on the low pressure exhaust gas recirculation conduit
Valve；
High pressure exhaust gas recirculation conduit, input terminal are connected to the exhaust pipe before the compress cell, output end connection
To the admission line after the compress cell, it is automatically controlled that high pressure exhaust gas recycling is provided on the high pressure exhaust gas recirculation conduit
Valve；
Water spray unit, the admission line after being set to high pressure exhaust gas recirculation conduit, for introducing water into air inlet；
Electronic control unit, for obtaining in the exhaust pipe before compress cell and between the admission line after compress cell
First pressure difference and in the exhaust pipe after compress cell and the second pressure difference between the admission line before compress cell, and
The compress cell, low pressure exhaust gas recycling electrically-controlled valve, high pressure exhaust gas are recycled according to first pressure difference and the second pressure difference
Electrically-controlled valve and water spray unit are controlled, and the side of low temperature combustion mode is realized thereby executing compression ignition engine as described above
Method.
Based on the above-mentioned technical proposal, the beneficial effects of the present invention are:
The present invention propose by exhaust gas recycles and spray water combine in the way of realize low temperature combustion mode, can substitute one
Portion recycling, effectively widens the operating load range of low temperature combustion mode, and the thermal efficiency for improving engine simultaneously, is kept
Low emission characteristic possessed by low temperature combustion mode.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the compression ignition engine of the realization low temperature combustion mode of one embodiment of the invention.
In above-mentioned attached drawing, appended drawing reference meaning is as follows:
1, admission line；2, water jet；3, check valve；4, air intake intercooler；5, high pressure exhaust gas recycle cooler；6, high
Exhaust gas is pressed to recycle electrically-controlled valve；7, air inlet；8, low pressure exhaust gas recirculation conduit；9, low pressure exhaust gas recycle cooler；10,
Grain trap；11, low pressure exhaust gas recycles electrically-controlled valve；12, pressure charging system；13, exhaust outlet；14, exhaust pipe；15, engine
Ontology；16, high pressure exhaust gas recirculation conduit.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in further detail.
According to some embodiments of the present invention, a kind of method that compression ignition engine realizes low temperature combustion mode is provided,
The following steps are included:
Step A: on a compression ignition engine including engine body, admission line, exhaust pipe and compress cell
The first pressure difference between exhaust pipe and admission line is obtained, and the second pressure between exhaust pipe and admission line
Difference；Wherein, the admission line is used to provide air inlet to the engine body, and the exhaust pipe is used for the engine
The exhaust gas discharge and the compress cell that ontology generates are set between the exhaust pipe and admission line, for recycling
The heat and raising admission pressure of the exhaust gas of discharge；
Step B: judging whether first pressure difference is positive, if so, corresponding generally to low speed Smaller load and height at this time
Fast high load working condition, then
Using high pressure exhaust gas egr mode from after the exhaust pipe extraction exhaust gas to compress cell before the compress cell
Admission line, to introduce exhaust gas in air inlet until realizing low temperature combustion mode, and be gradually decrease to 0 when first pressure difference
When also be not implemented low temperature combustion mode, then select execution step a C1 or C2；
Judge whether first pressure difference is negative, if so, corresponding generally to moderate duty or low speed and heavy load at this time
Operating condition, then
Directly select execution step a C1 or C2；
Step C1: exhaust gas is drawn to pressurization from the admission line after the compress cell using low pressure exhaust gas egr mode
Admission line before unit, to introduce exhaust gas in air inlet until realizing low temperature combustion mode, and work as second pressure difference gradually
It is decreased to that low temperature combustion mode is also not implemented when 0, then introduces water in air inlet, and water diversion is gradually increased until realizing low temperature combustion
Burning mode；
Step C2: introducing water in air inlet, and water diversion is gradually increased until realizing low temperature combustion mode.
Wherein, water diversion has threshold limit value in the air inlet of the compression ignition engine, when water diversion reaches threshold limit value,
The relative humidity of air inlet reaches 100% in compression ignition engine, as make air inlet saturated moist air or saturated moist air with
Introduce the mixture of exhaust gas.If water diversion makes relative humidity reach 100% or more, it can make occur water droplet in air inlet, cause to send out
The friction loss of motivation increases.
Wherein, the threshold limit value of the water diversion is indicated by following formula:
M=(d ' × (x-x × d0×φ/1000)-x×d0×φ)；
M is maximum water diversion, unit kg/h；X is the fresh air matter into the generator terminal of calming the anger of the compression ignition engine
Measure flow, unit kg/h；d0It is P for the atmospheric pressure in external environment0, temperature T0When saturated moist air water capacity,
Unit is g/kg；Φ is that atmospheric pressure is P0, temperature T0When air relative humidity, d ' be in intake air temperature be T ', air inlet pressure
Saturated moist air water capacity when power is P ', unit g/kg.Wherein saturated moist air is corresponding under different temperatures pressure contains
Moisture is normal data, can be found in formula calculating or the hot physical property standard data of humid air in ASHRAE handbook.
Wherein, the mode that water is introduced in the air inlet of the compression ignition engine is single-point or multi-point gas-duct water spray or air inlet
Humidification.
According to some embodiments of the present invention, a kind of compression ignition engine for realizing low temperature combustion mode is additionally provided, is wrapped
Include engine body, admission line, exhaust pipe, compress cell, low pressure exhaust gas recirculation conduit, high pressure exhaust gas recirculation pipe
Road, water spray unit and electronic control unit, in which: admission line, output end are connected to the engine body, for starting to this
Machine ontology provides air inlet；Exhaust pipe, input terminal are connected to the engine body, useless for generating the engine body
Gas discharge；Compress cell is set between exhaust pipe and admission line, the heat of the exhaust gas for recycling engine body output
Amount, and improve admission pressure；Low pressure exhaust gas recirculation conduit, input terminal are connected to the exhaust pipe after the compress cell,
Output end is connected to the admission line before the compress cell, and low pressure exhaust gas recycling is provided on the low pressure exhaust gas recirculation conduit
Electrically-controlled valve；High pressure exhaust gas recirculation conduit, input terminal are connected to the exhaust pipe before the compress cell, and output end is connected to this
Admission line after compress cell is provided with high pressure exhaust gas recycling electrically-controlled valve on the high pressure exhaust gas recirculation conduit；Water spray is single
Member, the admission line after being set to high pressure exhaust gas recirculation conduit, for introducing water into air inlet；Electronic control unit, for obtaining
In the exhaust pipe before compress cell and the first pressure difference between the admission line after compress cell and after compress cell
Exhaust pipe and the second pressure difference between the admission line before compress cell, and according to first pressure difference and the second pressure difference
The compress cell, low pressure exhaust gas recycling electrically-controlled valve, high pressure exhaust gas recycling electrically-controlled valve and water spray unit are controlled,
The method for realizing low temperature combustion mode thereby executing compression ignition engine as described above.
Wherein, check valve and high pressure exhaust gas recycle cooler are additionally provided on the high pressure exhaust gas recirculation conduit；
Wherein, grain catcher and low pressure exhaust gas recycle cooler are additionally provided on the low pressure exhaust gas recirculation conduit；
Charge air cooler is additionally provided on the admission line after the compressor.
Wherein, compress cell is using turbocharging, engine driven supercharging or electric supercharging mode.It, should when wherein using turbocharging
Compress cell includes turbine and compressor, in which: turbine is set on exhaust pipe, for recycling engine body output
The heat of exhaust gas；Compressor is set on admission line, for improving admission pressure.
Technical solution of the present invention is described further below by way of preferred embodiment:
As shown in Figure 1, the present embodiment provides a diesel engine, as the example of internal combustion engine, including engine body
15, admission line 1, exhaust pipe 14, compress cell, low pressure exhaust gas recirculation conduit 8, high pressure exhaust gas recirculation conduit 16, spray
Water unit and electronic control unit.
Engine body 15 comprising the basic element of character of the diesel engines such as fuel element, crankshaft connecting rod system, valve mechanism,
Therefore not to repeat here；
Admission line 1, output end are connected to engine body 15, for the engine body 15 for diesel engine provide into
Gas；Exhaust pipe 14, input terminal are connected to engine body 15, the exhaust gas for generating the engine body 15 of diesel engine
Discharge；
The energy of compress cell 12, the high temperature and pressure exhaust gas for engine body 15 to be discharged recycles, Yi Jiti
The admission pressure of high fresh air, in fact existing single stage supercharging, two-step supercharging, combined supercharging, engine driven supercharging, electric turbocharging etc.
Various ways are only the schematic diagram of single-stage turbocharging, specifically include turbine and compressor as shown in Figure 1, and wherein turbine is arranged
In on exhaust pipe 14, compressor is set on admission line 1；
Low pressure exhaust gas recirculation conduit 8, input terminal are connected to the exhaust pipe 14 after turbine, and output end, which is connected to, calms the anger
Thus admission line 1 before machine forms low pressure exhaust gas circulation loop between air inlet 7 and exhaust outlet 13；
Wherein, low pressure exhaust gas recycle cooler 9 is set on low pressure exhaust gas recirculation conduit 8, and function is by low pressure
The exhaust gas of exhaust gas recirculation circuit is cooled down；Grain catcher 10 is set on low pressure exhaust gas recirculation conduit 8, and function is
The particulate matter in exhaust gas is trapped, enters in compress cell after preventing it from mixing with fresh air and damages the blade of compressor；Low pressure
Exhaust gas recycling electrically-controlled valve 11 is set on low pressure exhaust gas recirculation conduit 8, and function is that control valve aperture is low to control
Press ER EGR Rate；
High pressure exhaust gas recirculation conduit 16, input terminal are connected to the exhaust pipe 14 before turbine, and output end is connected to pressure
Thus admission line 1 after mechanism of qi forms high pressure exhaust gas recirculation circuit between air inlet 7 and exhaust outlet 13；
Wherein, check valve 3 is set on high pressure exhaust gas recirculation conduit 16, and major function is to prevent air inlet from flowing back；Into
Gas Cooler 4 is set on admission line 1, and major function is that the air inlet after being pressurized compress cell 12 cools down, and is prevented
Only leading to the volumetric efficiency of cylinder in engine body 15 since intake air temperature is excessively high reduces；High pressure exhaust gas recycle cooler 5
It is set on high pressure exhaust gas recirculation conduit 16, function is to cool down the high-temperature exhaust air air inlet of engine；High pressure exhaust gas
Recycling electrically-controlled valve 6 is set on high pressure exhaust gas recirculation conduit 16, and function is the aperture of control valve to control high pressure
ER EGR Rate；
The corollary apparatus such as water spray unit, including water tank, water pump, water pipe and water jet 2, wherein only indicating water spray in Fig. 1
Device 2, major function are to mix water penetrating admission line 1 with fresh air, are located at after high pressure exhaust gas recirculation conduit；
Electronic control unit does not indicate in Fig. 1, for according to the exhaust pipe 14 before turbine and the air inlet after compressor
The first pressure difference between pipeline 1 and in the exhaust pipe 14 after turbine and second between the admission line 2 before compressor
Pressure difference, to be controlled to compress cell, low pressure exhaust gas recycling electrically-controlled valve, high pressure exhaust gas recycling electrically-controlled valve and water spray unit
System, thereby executing the method for following implemented low temperature combustion mode:
When engine turbine front exhaust pipeline pressure be greater than admission pressure, be conducive to introduce high pressure exhaust gas recycling.By
It gradually opens high pressure exhaust gas recycling electrically-controlled valve 6 and using the mode that high pressure exhaust gas recycle introduces exhaust gas and inhaled with to reduce pump and lose, when
After high pressure exhaust gas recycling introducing exhaust gas ability reaches capacity, i.e., when the first pressure difference is gradually decreased as 0, if low temperature is also not implemented
Burning can then select in following several operations: 1, it gradually opens low pressure exhaust gas recycling electrically-controlled valve 11 and continues to introduce exhaust gas,
After low pressure exhaust gas recycling introducing exhaust gas ability reaches capacity, i.e., when the second pressure difference is gradually decreased as 0, if being also not implemented low
Temperature burning, then sprayed water using water jet 2 in admission line 1, amount of water sprayed be gradually increased, until realizing low temperature combustion mode；2,
It is sprayed water directly in admission line 1 using water jet 2, amount of water sprayed is gradually increased, until realizing low temperature combustion mode.
When the turbine front exhaust pipeline pressure and admission pressure of engine remain basically stable, high pressure exhaust gas can not be introduced and followed again
Ring.It in order to realize low temperature combustion mode, can be selected in following several operations: 1, it is automatically controlled gradually to open low pressure exhaust gas recycling
Valve 11 introduces exhaust gas, and after low pressure exhaust gas recycling introducing exhaust gas ability reaches capacity, i.e., the second pressure difference is gradually decreased as 0
When, if low-temperature burning is also not implemented, is sprayed water in admission line 1 using water jet 2, amount of water sprayed is gradually increased, until realizing
Low temperature combustion mode；2, it is sprayed water in admission line 1 using water jet 2, amount of water sprayed is gradually increased, until realizing low-temperature burning mould
Formula.
Following influence wherein is had on the performance of engine by introducing water: (1) due to the gasification latent heat of water and specific heat capacity
Larger, the evaporation meeting of water is so that in-cylinder combustion temperature reduces, while vapor can also participate in doing work, and then improves engine thermal effect
Rate；(2) diesel oil emulsification is the multimodal system of Water-In-Oil mostly, and the boiling point of water is lower than diesel oil, therefore with the rapid raising of temperature,
Water can first be evaporated from diesel oil and make the broken of elaioleucite, and then lead to the generation of microexplosion phenomenon, strengthen atomizing effect；
(3) oxidation reaction of diesel oil can generate a large amount of active atoms of carbon and hydrocarbon, then will further polymerize, plycrystalline diamond, expansion
It is big to form soot with absorption, however with these substances water gas reaction can occur for vapor at high temperature, which can not only
The generation inducement of soot is eliminated, and generates hydrogen, since hydrogen maximum flame propagation velocity is 9 times of diesel oil, so combustion
After material plus hydrogen, wall surface extinguishing and narrow slit effect can largely be eased, and then be conducive to improve engine combustion and not
The generation of completely burned product.
But there are a problems very serious for emulsifying combustion in cylinder: if there is the water droplet of liquid, water in cylinder
The lubricating oil dilution caused in cylinder wall surface that may collide with cylinder wall surface is dripped, so that the friction loss of engine increases,
More serious will lead to engine air cylinder wear.
Applicant is it is further proposed that maximum water diversion is to make all saturations of the air inlet of compression ignition engine in air inlet as a result,
Humid air or saturated moist air and the mixture for introducing exhaust gas are indicated to solve the problems, such as that drop is hit by following formula
Are as follows:
M=(d ' × (x-x × d0×φ/1000)-x×d0×φ)；
Wherein, M is maximum water diversion, unit kg/h；X is the fresh air into the generator terminal of calming the anger of compression ignition engine
Mass flow, unit kg/h；d0It is P for the atmospheric pressure in external environment0, temperature T0When saturated moist air containing wet
Amount, unit g/kg；φ is that atmospheric pressure is P0, temperature T0When air relative humidity；It is T ' that d ', which is in intake air temperature, into
Saturated moist air water capacity when atmospheric pressure is P ', unit g/kg.
Emphasis of the invention is the strategy for proposing that a kind of EGR combines water spray to realize low-temperature burning, application of the invention
It is not limited solely to attached drawing institute of the present invention picture device, Combustion System is carried out in protection of the invention with keynote idea of the invention
Within the scope of.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in protection of the invention
Within the scope of.
Claims (10)
1. a kind of method that compression ignition engine realizes low temperature combustion mode, which comprises the following steps:
Step A: it is obtained on a compression ignition engine including engine body, admission line, exhaust pipe and compress cell
The first pressure difference between exhaust pipe and admission line, and the second pressure difference between exhaust pipe and admission line；Its
In, the admission line is used to provide air inlet to the engine body, and the exhaust pipe is used for the engine body
The exhaust gas of generation is discharged and the compress cell is set between the exhaust pipe and admission line, for recycling discharge
The exhaust gas heat and improve admission pressure；
Step B: judging whether first pressure difference is positive, if it is
Using high pressure exhaust gas egr mode from before the compress cell exhaust pipe draw exhaust gas to compress cell after into
Feed channel, to introduce exhaust gas in air inlet until realizing low temperature combustion mode, and also when first pressure difference is gradually decrease to 0
Low temperature combustion mode is not implemented, then selects execution step a C1 or C2；
Judge whether first pressure difference is negative, if it is
Directly select execution step a C1 or C2；
Step C1: exhaust gas is drawn to compress cell from the admission line after the compress cell using low pressure exhaust gas egr mode
Preceding admission line, to introduce exhaust gas in air inlet until realizing low temperature combustion mode, and when second pressure difference is gradually reduced
Low temperature combustion mode is also not implemented when to 0, then introduces water in air inlet, and water diversion is gradually increased until realizing low-temperature burning mould
Formula；
Step C2: introducing water in air inlet, and water diversion is gradually increased until realizing low temperature combustion mode.
2. the method according to claim 1, wherein diversion has maximum in the air inlet of the compression ignition engine
Limit value, when the water diversion reaches threshold limit value, the relative humidity of air inlet reaches 100% in the compression ignition engine.
3. according to the method described in claim 2, it is characterized in that, the threshold limit value of the water diversion passes through following formula table
Show:
M=(d ' × (x-x × d0×φ/1000)-x×d0×φ)；
Wherein, M is maximum water diversion, unit kg/h；X is the fresh air into the generator terminal of calming the anger of the compression ignition engine
Mass flow, unit kg/h；d0It is P for the atmospheric pressure in external environment0, temperature T0When saturated moist air containing wet
Amount, unit g/kg；φ is that atmospheric pressure is P0, temperature T0When air relative humidity；It is T ' that d ', which is in intake air temperature, into
Saturated moist air water capacity when atmospheric pressure is P ', unit g/kg.
4. the method according to claim 1, wherein introducing the side of water in the air inlet of the compression ignition engine
Formula is single-point or multi-point gas-duct water spray or air inlet humidification.
5. a kind of compression ignition engine for realizing low temperature combustion mode, which is characterized in that the compression ignition engine includes starting
Machine ontology, admission line, exhaust pipe, compress cell, low pressure exhaust gas recirculation conduit, high pressure exhaust gas recirculation conduit, water spray
Unit and electronic control unit, in which:
Admission line, output end are connected to the engine body, for providing air inlet to the engine body；
Exhaust pipe, input terminal are connected to the engine body, the exhaust gas discharge for generating the engine body；
Compress cell is set between exhaust pipe and admission line, for recycling the exhaust gas of engine body output
Heat, and improve admission pressure；
Low pressure exhaust gas recirculation conduit, input terminal are connected to the exhaust pipe after the compress cell, and output end is connected to institute
Admission line before stating compress cell is provided with low pressure exhaust gas recycling electrically-controlled valve on the low pressure exhaust gas recirculation conduit；
High pressure exhaust gas recirculation conduit, input terminal are connected to the exhaust pipe before the compress cell, and output end is connected to institute
Admission line after stating compress cell is provided with high pressure exhaust gas recycling electrically-controlled valve on the high pressure exhaust gas recirculation conduit；
Water spray unit, the admission line after being set to high pressure exhaust gas recirculation conduit, for introducing water into air inlet；
Electronic control unit, for obtaining in the exhaust pipe before compress cell and first between the admission line after compress cell
Pressure difference and in the exhaust pipe after compress cell and the second pressure difference between the admission line before compress cell, and according to
First pressure difference and the second pressure difference are automatically controlled to the compress cell, low pressure exhaust gas recycling electrically-controlled valve, high pressure exhaust gas recycling
Valve and water spray unit are controlled, and are realized thereby executing the compression ignition engine as described in Claims 1-4 any one low
The method of warm combustion mode.
6. compression ignition engine according to claim 5, it is characterised in that:
Check valve and high pressure exhaust gas recycle cooler are additionally provided on the high pressure exhaust gas recirculation conduit；
Grain catcher and low pressure exhaust gas recycle cooler are additionally provided on the low pressure exhaust gas recirculation conduit；
Charge air cooler is additionally provided on the admission line after the compressor.
7. compression ignition engine according to claim 5, which is characterized in that the water spray unit further include water tank, water pipe,
Water pump and water jet, in which:
Water pipe, input terminal are connected to the water tank, and output end is connected to the water jet, for by the water in the water tank
It is delivered to water jet；
Water pump is set on the water pipe, provides the power of water conveying；
Water jet is set on the admission line, for spraying water into air inlet.
8. compression ignition engine according to claim 5, which is characterized in that the compress cell uses turbocharging, machine
Tool pressurization or electric supercharging mode.
9. compression ignition engine according to claim 8, which is characterized in that when the compress cell uses turbocharging,
It includes turbine and compressor, in which:
Turbine is set on exhaust pipe, the heat of the exhaust gas for recycling the engine body output；
Compressor is set on admission line, for improving admission pressure.
10. according to the described in any item compression ignition engines of claim 5~9, which is characterized in that the compression ignition engine is
Diesel engine.
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