CN108561233A - A kind of diesel/natural gas dual-fuel engine emission control strategy - Google Patents
A kind of diesel/natural gas dual-fuel engine emission control strategy Download PDFInfo
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- CN108561233A CN108561233A CN201810208544.5A CN201810208544A CN108561233A CN 108561233 A CN108561233 A CN 108561233A CN 201810208544 A CN201810208544 A CN 201810208544A CN 108561233 A CN108561233 A CN 108561233A
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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
- F02D41/38—Controlling fuel injection of the high pressure type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- 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
- F02D19/0639—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 characterised by the type of fuels
- F02D19/0642—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 characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
- F02D19/0647—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 characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
-
- 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
- F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02D19/0686—Injectors
- F02D19/0694—Injectors operating with a plurality of fuels
-
- 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
- F02D19/081—Adjusting the fuel composition or mixing ratio; Transitioning from one fuel to the other
-
- 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
- F02D19/10—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 peculiar to compression-ignition engines in which the main fuel is gaseous
- F02D19/105—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 peculiar to compression-ignition engines in which the main fuel is gaseous operating in a special mode, e.g. in a liquid fuel only mode for starting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
- F02M43/04—Injectors peculiar thereto
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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)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
The present invention relates to a kind of diesel/natural gas dual-fuel engine emission control strategies, it is characterised in that：Specific control strategy is as follows：S1：Crank position is sensed to be judged with load；S2：The control of oil gas share injector；It, can be to the injection real-time control of bavin oil and gas, to be adjusted in real time to cylinder fuel concentration distribution, characteristic distribution by oil gas share injector and double fuel ECU；For different operating modes and the combustion characteristics of fuel, in conjunction with flexible injection strategy and EGR appropriate, mixed characteristic, fire behaviour that can be effectively in master cylinder to optimize in-cylinder combustion, while reducing NO X , PM, HC and CO discharge.
Description
Technical field
The present invention relates to dual fuel engine Exhaust Emission Control research field more particularly to a kind of diesel/natural gas are double
Engine fuel emission control strategy.
Background technology
Modern Internal-Combustion Engine needs to meet stringent discharge standard, including nitrogen oxides（NO X ）, particulate matter（PM）, hydrocarbonization
Object（HC）, oxycarbide（CO）Deng.Traditional combustion engine, due to combustion mode, fuel characteristic, fuel enter cylinder mode etc. because
Element can not improve the trade-off relationships of in-cylinder combustion product, be wanted to complicated and expensive after-treatment device to increase
It asks（SCR, DOC, DPF etc.）And the live load of after-treatment device.Therefore improve the trade-off relationships of in-cylinder combustion product,
And according to different load, using best control bleed strategy, realize that the clean burning of green is particularly important in cylinder.
Invention content
The technical problem to be solved in the present invention is to provide a kind of diesel/natural gas dual-fuel engine emission control strategy,
The trade-off relationships of in-cylinder combustion product can be improved, reduced to complicated and expensive after-treatment device requirement and drop
The live load of low after-treatment device.
In order to solve the above technical problems, the technical scheme is that：A kind of diesel/natural gas dual-fuel engine discharge
Control strategy, innovative point are：Specific control strategy is as follows：
S1：Crank position is sensed to be judged with load：Double fuel ECU read the crank rotation angle that crankshaft position sensor is sent into and
Tach signal, the position signal for the car ACCEL that accelerator pedal sensor provides are used for reflecting the payload of engine,
To for dual fuel engine obtain load rank, that is, judge engine operation condition for cold start-up, idling, underload, in it is low
Load, middle high load capacity, big load；
S2：The control of oil gas share injector：The oil gas share injector of use is connected respectively to oil feed line and supply air line,
And oil gas share injector is connected with double fuel ECU, ECU is according to the current operating condition of engine of acquisition and calibrated
Diesel oil and natural gas control MAP, to control the injecting times of two kinds of fuel in injector, each time for spraying and spray
Penetrate pulsewidth；
S3：Operating mode corresponding to S1 judging results executes S4 or S5 or S6 or S7 steps；
S4：Engine control under cold start-up, idling and low load condition operating mode：S1 judging results be cold start-up, idling and
Running on the lower load, then ECU worked, do not had with full diesel pattern according to the combustion system of calibrated conventional diesel engine
Natural gas participates in burning；The distributive value of engine, still according to original machine control strategy, phase is executed by double fuel ECU with fuel injection characteristic
Pass control program, oil spout drive module drive fuel injector work, complete startup, the stable operation of idling and underload；
S5：Engine control under middle-low load status condition：S1 judging results are middle-low load, then ECU controls diesel oil and day
Right gas uses single injection strategy；After the compression stroke stage starts, natural gas high pressure is injected into cylinder, and injection pressure is 12 ~
16MPa is adequately mixed with air in cylinder；Then, diesel oil 6 ~ 12 °C of A high-pressure injections before top dead centre enter cylinder, spray
Injection pressure is 80 ~ 140MPa；The advance burning of diesel oil, forms a large amount of fiery cores in the combustion chamber, and the flammable of surrounding of then igniting mixes
Gas is closed, is mixed and burned close to homogeneous；Burning highly effective cleans, and can inhibit NO well X With the discharge of PM；As load increases, day
Right gas ratio gradually rises, and introduces EGR to realize the low emissions combustion for being adapted to this operating mode；
S6：Engine control under middle higher load condition operating mode：S1 judging results are middle high load capacity, then ECU controls diesel oil and uses
Single injection strategy, Gas Exploitation multi-injection strategy；Natural gas proportion increases, and combines EGR rate appropriate；Compression
Stroke stage, diesel oil 20 ~ 25 °C of A high-pressure injections before top dead centre enter cylinder, and injection pressure is 80 ~ 140MPa；Then, naturally
Gas enters cylinder using high pressure multi-injection, and injection pressure is 12 ~ 16MPa；
S6.1 natural gases are respectively sprayed for the first time based on three sections of injections, and second of injection, third time is sprayed, and described first
Natural gas ratio shared by secondary emitted dose is 5% ~ 15%, and natural gas ratio shared by second of emitted dose is 76% ~ 92%, and third time is sprayed
The shared natural gas ratio of amount is 3% ~ 9%；Second of injection starting point is set to 2 ~ 4 °C of A before top dead centre, and injection for the first time is sprayed with second
6 ~ 12 °C of A are divided between penetrating；Second of injection is 10 ~ 20 °C of A with third time injection interval；Natural gas injection for the first time improves mixed
It closes gas and forms quality, the ignition time delay of second of injection can be shortened by being formed by pre-mixing combustion, be reduced maximum in cylinder
Explosion pressure and maximum combustion temperature play and reduce NO X Discharge, avoids the effect of detonating combustion；Natural gas third time injection
Jet action promotes the turbulent perturbation of gaseous mixture in cylinder, and its combustion heat release improves cylinder temperature, to improve HC, PM
And the oxygenation efficiency of CO, reduce the discharge of HC, PM and CO；Therefore the above injection strategy is used, realize NO X , PM, HC and
The overall reduction of CO discharges；
S7：Engine control under high load capacity and full load status condition：If S1 judging results are high load capacity and full load,
Then ECU still executes strategy similar with middle and high load working condition；On this basis, natural gas proportion declines, and is avoided greatly with this
When load condition, since combustion of natural gas speed is slower, after-burning ratio increases, and arranges temperature and rises, and engine heat load increases, and occurs
Detonating combustion is unfavorable for engine reliable operation；Meanwhile substitution rate reduces, in-cylinder combustion temperature is high when due to big load, if replacing
Cause diesel oil flow too small for rate is excessively high, is unfavorable for the cooling of nozzle, nozzle life can shorten.
Further, the dual fuel engine is a natural gas supply system in parallel on the basis of former diesel engine.
The advantage of the invention is that：
1）Under cold start-up, idling and running on the lower load, is worked using traditional full diesel pattern, avoid dynamic property not
Foot, the situations such as poor combustion stability；Effectively avoid the atomizer cooling caused by the too small possibility of distributive value bad simultaneously.
2）Under middle-low load working condition, diesel oil and Gas Exploitation single injection strategy；Natural gas proportion is not high, from
And poor combustion stability when avoiding Smaller load, the problem of combustion of natural gas is insufficient, and hydrocarbon emission increases, and dynamic property declines.Together
When, natural gas is more early spurted into cylinder, by controlling the diesel injection moment, realizes that the quasi-Homogeneous of natural gas is mixed and burned.Together
When, EGR is appropriately introduced into the condition range for having widened engine, increases the concentration range of fuel, expands the tune of air-fuel ratio
Adjusting range, is conducive to the normal operation of engine, and realizes efficient, clean burning.
3）Under middle and high load working condition, using diesel oil single injection event, natural gas multi-injection strategy.Natural gas proportion
It increases, and as a result of oil gas share injector, mixture combustion speed is fast, engine thermal efficiency is high, and dynamic property is strong.Pass through
It the multi-injection of natural gas and intercouples with diesel oil, realizes that the controllable layering of in-cylinder mixture strength and propellant composition divides
Cloth has both diffusion combustion and homogeneous flame propagation.EGR rate is controlled according to operating mode simultaneously, realizes the conjunction to in-cylinder combustion process
Tissue is managed, NO is greatly reduced X , PM, HC and CO discharge.
4）Under high load capacity and full load mode, using injection strategy similar with middle high load capacity.Only appropriateness reduces
Natural gas proportion, when avoiding high load working condition, the after-burning ratio that combustion of natural gas speed brings more slowly increases, row's temperature
Rise, engine heat load increases, and the factor that detonating combustion etc. is unfavorable for engine reliable operation occurs.Meanwhile when big load
In-cylinder combustion temperature is high, and appropriateness reduces natural gas proportion, avoids that diesel oil flow is too small, is unfavorable for the cooling of nozzle, sprays
The problem of mouth service life can shorten.
5）Using different combustion modes, by the flexible control to fuel injection and EGR technology is combined, is greatly reduced
NO X , PM, HC and CO discharge, thus greatly reduce to complicated and expensive preprocessor（SCR, DOC, DPF etc.）'s
It is required that reducing the live load of after-treatment device, there is very high economy；Using oil gas share injector, there are two sets of needle-valves.
The injecting time and pulsewidth of internal noticeable degree diesel oil, external noticeable degree CNG can neatly control the entrance of fuel high pressure direct-injection
Cylinder, mixture combustion speed is fast, and engine thermal efficiency is high, and dynamic property is strong.And its external shape and conventional diesel oil spray
Mouth is very nearly the same, need not carry out big change to original machine substantially.
Description of the drawings
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is the oil gas share injector schematic diagram of the present invention.
Fig. 2 is the control principle block diagram of the present invention.
Fig. 3 is the engine operation process block diagram of the present invention.
Fig. 4 is fuel injection event schematic diagram under the engine middle-low load working condition of the present invention.
Fig. 5 is under high load capacity, high load capacity and full load mode in the engine of the present invention, fuel injection event is illustrated
Figure.
As shown in the figure：101. oil gas share injector；102. solenoid valve；103. fuel feeding/oil return；104. two sections of valves of break-make；
105. fuel oil plunger；106. fuel pin；107. natural gas needle-valve；108. plunger；109. natural gas；110. fuel spray；
111. natural gas spray；401. natural gas injection；402. diesel injection；403. intake stroke lower dead centers；404. compression stroke
Top dead centre；501. diesel injection；The injection (a small amount of) for the first time of 502. natural gases；503. natural gases, second of injection (volume)
；504. natural gases third time injection (a small amount of);505. intake stroke lower dead centers；506. compression stroke top dead centres； 507.
Diesel oil and natural gas first time injection interval angle；The injection for the first time of 508. natural gases and second of injection interval angle;509. it
Second of the injection of right gas and third time injection interval angle.
Specific implementation mode
The following examples can make professional and technical personnel that the present invention be more fully understood, but therefore not send out this
It is bright to be limited among the embodiment described range.
A kind of diesel/natural gas dual-fuel engine emission control strategy as shown in Figures 1 to 5, specific control strategy is such as
Under：
S1：Crank position is sensed to be judged with load：Double fuel ECU read the crank rotation angle that crankshaft position sensor is sent into and
Tach signal, the position signal for the car ACCEL that accelerator pedal sensor provides are used for reflecting the payload of engine,
To for dual fuel engine obtain load rank, that is, judge engine operation condition for cold start-up, idling, underload, in it is low
Load, middle high load capacity, big load.
S2：The control of oil gas share injector：The oil gas share injector 101 of use is connected respectively to oil feed line 103
With supply air line 109, and oil gas share injector is connected with double fuel ECU, and ECU is according to the current operating condition of engine of acquisition
And the control MAP of calibrated diesel oil and natural gas, to control the injecting times of two kinds of fuel in injector, every time
Time for spraying and injection pulse width.
S3：Operating mode corresponding to S1 judging results executes S4 or S5 or S6 or S7 steps.
S4：Engine control under cold start-up, idling and low load condition operating mode：S1 judging results are cold start-up, idling
And running on the lower load, then ECU worked with full diesel pattern according to the combustion system of calibrated conventional diesel engine,
There is no natural gas to participate in burning；The distributive value of engine, still according to original machine control strategy, is held with fuel injection characteristic by double fuel ECU
Row associated control procedures, oil spout drive module drive fuel injector work, and that completes startup, idling and underload stablizes fortune
Row.
S5：Engine control under middle-low load status condition：S1 judging results are middle-low load, then ECU controls diesel oil
With Gas Exploitation single injection strategy；After the compression stroke stage starts, 401 high-pressure injection of natural gas enters cylinder, injection pressure
Power is 12 ~ 16MPa, is adequately mixed with air in cylinder；Then, 6 ~ 12 °C of A high pressure sprays before top dead centre 404 of diesel oil 402
It injects into cylinder, injection pressure is 80 ~ 140MPa；The advance burning of diesel oil forms a large amount of fiery cores, then ignites in the combustion chamber
The combustion mixture of surrounding is mixed and burned close to homogeneous；Burning highly effective cleans, and can inhibit NO well X With the discharge of PM；With
Load increases, and natural gas ratio gradually rises, and introduces EGR to realize the low emissions combustion for being adapted to this operating mode.
S6：Engine control under middle higher load condition operating mode：S1 judging results are middle high load capacity, then ECU controls diesel oil
Using single injection strategy, Gas Exploitation multi-injection strategy；Natural gas proportion increases, and combines EGR rate appropriate；
Compression stroke stage, 20 ~ 25 °C of A high-pressure injections before top dead centre 506 of diesel oil 501 enter cylinder, and injection pressure is 80 ~
140MPa；Then, Gas Exploitation high pressure multi-injection enters cylinder, and injection pressure is 12 ~ 16MPa.
S6.1 natural gases are based on three sections of injections, respectively injection 502 for the first time, second of injection 503, and third time is sprayed
504, natural gas ratio shared by the first time emitted dose is 5% ~ 15%, natural gas ratio shared by second of emitted dose is 76% ~
92%, natural gas ratio shared by third time emitted dose is 3% ~ 9%；Second of injection starting point is set to 2 ~ 4 °C of A before top dead centre 506, the
Primary injection is 6 ~ 12 °C of A with second of injection interval 508；Second of injection is 10 ~ 20 °C of A with third time injection interval 509；
Injection improves quality of mixing gas mixture to natural gas for the first time, and second of injection can be shortened by being formed by pre-mixing combustion
Ignition time delay, reduce cylinder in maximum outbreak pressure and maximum combustion temperature, play reduce NO X Discharge, avoids detonating combustion
Effect；The jet action of natural gas third time injection promotes the turbulent perturbation of gaseous mixture in cylinder, and its combustion heat release is promoted
Cylinder temperature to improve the oxygenation efficiency of HC, PM and CO reduces the discharge of HC, PM and CO；Therefore use the above spray
Strategy is penetrated, NO is realized X , PM, HC and CO discharge overall reduction.
S7：Engine control under high load capacity and full load status condition：If S1 judging results are for high load capacity and entirely
Load, then ECU still execute strategy similar with middle and high load working condition；On this basis, natural gas proportion declines, and is kept away with this
When exempting from high load working condition, since combustion of natural gas speed is slower, after-burning ratio increases, and arranges temperature and rises, and engine heat load increases,
Detonating combustion occurs, is unfavorable for engine reliable operation；Meanwhile substitution rate reduces, in-cylinder combustion temperature is high when due to big load,
Cause diesel oil flow too small if substitution rate is excessively high, be unfavorable for the cooling of nozzle, nozzle life can shorten.
Dual fuel engine is a natural gas supply system in parallel on the basis of former diesel engine.
It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, above-described embodiment and explanation
Merely illustrating the principles of the invention described in book, without departing from the spirit and scope of the present invention, the present invention also has
Various changes and modifications, these changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention
It is defined by the appending claims and its equivalent thereof.
Claims (2)
1. a kind of diesel/natural gas dual-fuel engine emission control strategy, it is characterised in that：Specific control strategy is as follows：
S1：Crank position is sensed to be judged with load：Double fuel ECU read the crank rotation angle that crankshaft position sensor is sent into and
Tach signal, the position signal for the car ACCEL that accelerator pedal sensor provides are used for reflecting the payload of engine,
To for dual fuel engine obtain load rank, that is, judge engine operation condition for cold start-up, idling, underload, in it is low
Load, middle high load capacity, big load；
S2：The control of oil gas share injector：The oil gas share injector of use is connected respectively to oil feed line and supply air line,
And oil gas share injector is connected with double fuel ECU, ECU is according to the current operating condition of engine of acquisition and calibrated
Diesel oil and natural gas control MAP, to control the injecting times of two kinds of fuel in injector, each time for spraying and spray
Penetrate pulsewidth；
S3：Operating mode corresponding to S1 judging results executes S4 or S5 or S6 or S7 steps；
S4：Engine control under cold start-up, idling and low load condition operating mode：S1 judging results be cold start-up, idling and
Running on the lower load, then ECU worked, do not had with full diesel pattern according to the combustion system of calibrated conventional diesel engine
Natural gas participates in burning；The distributive value of engine, still according to original machine control strategy, phase is executed by double fuel ECU with fuel injection characteristic
Pass control program, oil spout drive module drive fuel injector work, complete startup, the stable operation of idling and underload；
S5：Engine control under middle-low load status condition：S1 judging results are middle-low load, then ECU controls diesel oil and day
Right gas uses single injection strategy；After the compression stroke stage starts, natural gas high pressure is injected into cylinder, and injection pressure is 12 ~
16MPa is adequately mixed with air in cylinder；Then, diesel oil 6 ~ 12 °C of A high-pressure injections before top dead centre enter cylinder, spray
Injection pressure is 80 ~ 140MPa；The advance burning of diesel oil, forms a large amount of fiery cores in the combustion chamber, and the flammable of surrounding of then igniting mixes
Gas is closed, is mixed and burned close to homogeneous；Burning highly effective cleans, and can inhibit NO well X With the discharge of PM；As load increases, day
Right gas ratio gradually rises, and introduces EGR to realize the low emissions combustion for being adapted to this operating mode；
S6：Engine control under middle higher load condition operating mode：S1 judging results are middle high load capacity, then ECU controls diesel oil and uses
Single injection strategy, Gas Exploitation multi-injection strategy；Natural gas proportion increases, and combines EGR rate appropriate；Compression
Stroke stage, diesel oil 20 ~ 25 °C of A high-pressure injections before top dead centre enter cylinder, and injection pressure is 80 ~ 140MPa；Then, naturally
Gas enters cylinder using high pressure multi-injection, and injection pressure is 12 ~ 16MPa；
S6.1 natural gases are respectively sprayed for the first time based on three sections of injections, and second of injection, third time is sprayed, and described first
Natural gas ratio shared by secondary emitted dose is 5% ~ 15%, and natural gas ratio shared by second of emitted dose is 76% ~ 92%, and third time is sprayed
The shared natural gas ratio of amount is 3% ~ 9%；Second of injection starting point is set to 2 ~ 4 °C of A before top dead centre, and injection for the first time is sprayed with second
6 ~ 12 °C of A are divided between penetrating；Second of injection is 10 ~ 20 °C of A with third time injection interval；Natural gas injection for the first time improves mixed
It closes gas and forms quality, the ignition time delay of second of injection can be shortened by being formed by pre-mixing combustion, be reduced maximum in cylinder
Explosion pressure and maximum combustion temperature play and reduce NO X Discharge, avoids the effect of detonating combustion；Natural gas third time injection
Jet action promotes the turbulent perturbation of gaseous mixture in cylinder, and its combustion heat release improves cylinder temperature, to improve HC, PM
And the oxygenation efficiency of CO, reduce the discharge of HC, PM and CO；Therefore the above injection strategy is used, realize NO X , PM, HC and
The overall reduction of CO discharges；
S7：Engine control under high load capacity and full load status condition：If S1 judging results are high load capacity and full load,
Then ECU still executes strategy similar with middle and high load working condition；On this basis, natural gas proportion declines, and is avoided greatly with this
When load condition, since combustion of natural gas speed is slower, after-burning ratio increases, and arranges temperature and rises, and engine heat load increases, and occurs
Detonating combustion is unfavorable for engine reliable operation；Meanwhile substitution rate reduces, in-cylinder combustion temperature is high when due to big load, if replacing
Cause diesel oil flow too small for rate is excessively high, is unfavorable for the cooling of nozzle, nozzle life can shorten.
2. a kind of diesel/natural gas dual-fuel engine emission control strategy according to claim 1, it is characterised in that：
The dual fuel engine is a natural gas supply system in parallel on the basis of former diesel engine.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN109209656A (en) * | 2018-09-29 | 2019-01-15 | 哈尔滨工程大学 | A kind of multi-injection and precombustion chamber low pressure gas supply and diesel oil is micro- sprays the natural gas engine burning tissues method ignited |
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