CN108506133A - A kind of engine system and its fuel-injecting method - Google Patents
A kind of engine system and its fuel-injecting method Download PDFInfo
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- CN108506133A CN108506133A CN201710101471.5A CN201710101471A CN108506133A CN 108506133 A CN108506133 A CN 108506133A CN 201710101471 A CN201710101471 A CN 201710101471A CN 108506133 A CN108506133 A CN 108506133A
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- Prior art keywords
- fuel
- injection
- fuel injector
- injecting method
- combustion chamber
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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
- 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
- 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
- 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
- F02M61/145—Arrangements of injectors with respect to engines; Mounting of injectors the injection nozzle opening into the air intake conduit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
- F01N2430/08—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by modifying ignition or injection timing
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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
- F02D2250/00—Engine control related to specific problems or objectives
Abstract
The present invention provides a kind of engine system and its fuel-injecting method, the engine system includes the first fuel injector and the second fuel injector, and the fuel-injecting method includes：Before air inlet top dead centre, the first fuel injector sprays most of fuel oil in inlet manifold；After air inlet top dead centre or near, the second fuel injector spray remaining fraction fuel oil in the combustion chamber.When the second fuel injector overhead, in second of injection of near progress, the second fuel injector side, second of injection is carried out after air inlet top dead centre.The fuel-injecting method is used under catalyst converter heating cycle, keeps gaseous mixture incorporation time longer and more abundant；It is injected in spark plug in the combustion chamber of part and is formed about denseer charge stratification, while generating turbulent flow, improves the stability of burning.To make the angle of ignition further be postponed, catalyst converter heating speed is improved, is allowed to faster reach operating temperature, to reduce gaseous effluent and particle emission.
Description
Technical field
The present invention relates to engine fuel injection control technology fields, more particularly to a kind of hair under catalyst converter heating cycle
Motivation system and its fuel-injecting method.
Background technology
Ternary catalyzing unit is mounted in most important outer purifier in automobile exhaust system, it can be by vehicle exhaust
The pernicious gases such as carbon monoxide, hydrocarbon and the nitrogen oxides of discharge are changed into harmless two by oxidation and reduction
Carbonoxide, water and nitrogen.When the vehicle exhaust of high temperature passes through ternary catalyzing unit, catalyst therein will enhance carbon monoxide,
The reactivity of three kinds of gas of hydrocarbon and nitrogen oxides promotes it to carry out certain redox chemistry reaction, wherein
Carbon monoxide is oxidized into colourless, nontoxic carbon dioxide gas at high temperature；Hydrocarbon be oxidized at high temperature water and
Carbon dioxide；Nitrogen oxides is reduced into nitrogen and oxygen.Three kinds of pernicious gases become innocuous gas, keep vehicle exhaust net
Change.The emission regulation of gasoline engine is increasingly strict, is got over to the limit value of gaseous effluent carbon monoxide, hydrocarbon and nitrogen oxides
Come tighter.
After engine cold starting, since ternary catalyzing unit is also in cold state, very to the transformation efficiency of exhaust gas discharge
It is low, produce a large amount of discharge.In order to meet more harsh emission regulation, need that ternary catalyzing unit is allowed to reach work temperature as early as possible
Degree, as early as possible starts conversion emission, achievees the purpose that reduce discharge.Therefore in the control strategy of modern gasoline machine,
The strategy of catalyst converter heating has been all made of to postpone the angle of ignition as possible after that is, engine cold starts, can significantly carry in this way
High exhaust temperature, to accelerate ternary catalyzing unit heating process, to reduce discharge.After ternary catalyzing unit reaches target temperature,
Above heating process terminates, and is switched to other normal processes.Above process, we term it " catalyst converter heating cycles ".
The cooperation of catalyst converter heating cycle uses special fuel oil injection strategy and ignition advance angle control strategy, straight in cylinder
In injection gasoline engine engine, inner cylinder direct injection is divided into twice, and injection for the first time in the intake stroke, sprays into most of combustion
Oil；Second of injection is set at and sprays into a small amount of fuel oil very close to the position of compression top center.Second of injection can increase
The turbulent flow of gaseous mixture in combustion chamber, meanwhile, denseer gaseous mixture is formed about in spark plug so that burning is more stablized, to
The angle of ignition can be made more to postpone.Doing so can make delivery temperature increase, and quickly heat ternary catalyzing unit, make it shorter
Time in reach operating temperature, achieve the purpose that reduce gas discharge.
In the Incylinder direct injection fuel injection system of high pressure fuel injector overhead, this strategy has obtained fine application, can be with
Effectively reduce gaseous effluent.But due to the limitation of single cylinder injection, which still uses in cylinder in the first injection
Direct-injection sprays into most of fuel oil.Engine temperature at this time is relatively low, and the mixed effect and incorporation time of in-cylinder direct-jet are limited, can
The fuel oil mixing of first injection caused by energy is undesirable, and subsequent burning can be caused insufficient, influence combustion stability.It mixes simultaneously
The uneven and wet wall phenomenon closed, will produce a large amount of particle emission.
In the Incylinder direct injection fuel injection system of high pressure fuel injector side, due to the oil spout by the way of side spray,
The fuel oil of secondary injection is needed the denseer gaseous mixture in this part through the special shape of air motion and top land in cylinder
Be transported near spark plug, this give Combustion chamber design, In Cylinder Flow cooperation, and igniting oil injection time propose it is very high
Requirement.If deviation occurs in three's cooperation, it cannot all reach desired effect.Meanwhile three also being required to start in batch production
There is higher conformity of production in machine, reduces production scattered error.And once have disturbance factor, it is not achieved and stablizes burning and step back
The purpose of the angle of ignition.The starting point of second of injection can only be postponed till near 150 ° of compression top center front crankshaft corner, then postpone
Engine just becomes highly unstable or even flame-out, the angle of ignition postponement far can not also reach expected, catalyst converter heating effect by
To prodigious limitation.Simultaneously as undercompounding, combustion instability, lead to very high particulate emission, to meeting particulate emission
Relevant standard has prodigious negative effect.
Therefore, it is necessary to design under a kind of catalyst converter heating cycle, abundant, combustion stablized injection system and strategy are mixed.
Invention content
The purpose of the present invention is to provide a kind of engine system and its fuel-injecting methods, to solve existing catalyst converter
Under heating cycle, Injection strategy is improper to lead to undercompounding, combustion instability and make catalyst converter heating effect is undesirable to ask
Topic.
In order to solve the above technical problems, the present invention provides a kind of engine system, the engine system includes fuel oil spray
Penetrate system, combustion chamber, inlet manifold, inlet valve, piston, wherein：
The fuel injection system includes the first fuel injector and the second fuel injector, before air inlet top dead centre, the first fuel injector
In inlet manifold fuel oil is sprayed to inlet valve direction；Second fuel injector carries out second to piston direction in the combustion chamber and sprays
It penetrates, sprays remaining fuel oil；
The combustion chamber connects the inlet manifold, and is separated by the inlet valve；
The piston is located at the lower end of the combustion chamber.
Optionally, in the engine system, first fuel injector is complete to inlet valve direction injection one
The fuel oil of total fuel injection quantity 50%~90% in whole working cycles.
Optionally, in the engine system, second fuel injector sprays one completely to the piston direction
The fuel oil of total fuel injection quantity 10%~50% in working cycles.
Optionally, in the engine system, second fuel injector sprays fuel oil from top of combustion chamber.
Optionally, in the engine system, the second fuel injector injection is happened near.
Optionally, in the engine system, second fuel injector sprays fuel oil from combustion chamber side top.
Optionally, in the engine system, the second fuel injector injection occurs after intake top dead center.
The present invention also provides a kind of fuel-injecting method, the fuel-injecting method includes the following steps：
It sprays for the first time：Before air inlet top dead centre, the first fuel injector sprays one in inlet manifold to inlet valve direction
The part fuel oil of total fuel injection quantity in complete job cycle；
Second of injection：Second fuel injector sprays total oil spout in a complete job cycle to piston direction in the combustion chamber
Remaining fuel oil after the first time injection of amount.
Optionally, in the fuel-injecting method, second fuel injector sprays fuel oil from top of combustion chamber.
Optionally, in the fuel-injecting method, second of injection is happened near.
Optionally, in the fuel-injecting method, the amount of fuel of second of injection is that a complete job follows
Total fuel injection quantity 5%~15% in ring.
Optionally, in the fuel-injecting method, second fuel injector sprays fuel oil from combustion chamber side top.
Optionally, in the fuel-injecting method, second of injection occurs after intake top dead center.
Optionally, in the fuel-injecting method, the amount of fuel of second of injection is that a complete job follows
Total fuel injection quantity 20%~40% in ring.
Optionally, in the fuel-injecting method, the injecting times one of second of injection are to twice.
Optionally, in the fuel-injecting method, second of injection is lighted a fire after completing a period of time.
Optionally, in the fuel-injecting method, the fuel-injecting method is used under catalyst converter heating cycle.
In engine system provided by the invention and its fuel-injecting method, the engine system includes to air inlet qi
The oil spout of the first fuel injector sprayed in pipe and the second fuel injector sprayed into combustion chamber, duel fuel injector can flexibly mutually
Cooperation, can be used a greater variety of fuel-injecting methods and strategy, and before air inlet top dead centre, the first fuel injector is into inlet manifold
Most of fuel oil of total fuel injection quantity in one complete job cycle of injection；Injection is sprayed by inlet manifold instead of original for the first time
Combustion chamber in direct-injection, can be longer with gaseous mixture incorporation time, be more fully mixed, then, the second fuel injector is in the combustion chamber
The Fuel Remained of total fuel injection quantity in one complete job cycle of injection, it is to be sprayed in combustion chamber to remain second of injection, in fire
Hua Sai is formed about denseer charge stratification, while generating turbulent flow, further improves the stability of burning.To make igniting
Angle can further be postponed, and the level of catalyst converter heating is further increased, and further decrease gaseous effluent and particle row
Put object.The fuel injector overhead fuel-injecting method for comparing the prior art, using this new blended fuel oil injection method, Ke Yijin
One step improves the gaseous mixture mixed process after spraying for the first time, the combustion stability of engine under the operating mode further promoted,
Ignition advance angle is further postponed, and ternary catalyzing unit quickly speed ignition, gaseous effluent can further be dropped
It is low.Simultaneously as the gaseous mixture mixed process after spraying for the first time improves, reduce wet wall phenomenon, particulate emission under the operating mode
Object will be significantly reduced, this meets harsh particulate emission regulation to vehicle and provides good basis.Compare the prior art
Fuel injector side fuel-injecting method, the flameholding of engine under the operating mode that new fuel-injecting method is significantly promoted
Property, ignition advance angle is able to postpone 15 ° of piston crank angle or more, and delivery temperature increases 150 DEG C or more, and ternary catalyzing unit is able to
Significant reduction can be obtained in quickly ignition, gaseous effluent.Meanwhile using new fuel-injecting method, due to improving combustion
It burns, reduces wet wall phenomenon, particle emission is greatly reduced under the operating mode, and particle emission is reduced to original ten
/ mono- provides good basis hereinafter, this meets harsh particulate emission regulation to vehicle.Meanwhile the fuel-injecting method
With good robustness.
Description of the drawings
Fig. 1 is existing engine system structural schematic diagram；
Fig. 2 is existing engine system structural schematic diagram；
Fig. 3 is existing fuel-injecting method fate map；
Fig. 4 is engine system structural schematic diagram in first embodiment of the invention；
Fig. 5 is engine system structural schematic diagram in second embodiment of the invention；
Fig. 6 is third embodiment of the invention intermediate fuel oil injection method fate map；
Fig. 7 is fourth embodiment of the invention intermediate fuel oil injection method fate map；
As shown in the figure：1- ternary catalyzing units；The first fuel injectors of 2-；3- spark plugs；4- inlet valves；5- exhaust valves；6- pistons；
The second fuel injectors of 7-；8- inlet manifold；9- exhaust pipes；The combustion chambers 10-；11- air inlet top dead centres；12- air inlets lower dead center；13- is pressed
Contracting top dead centre；Injection process in the first time combustion chambers 21-；Injection process in second of the combustion chamber 22-；23- first time air inlet discriminations
Injection process in pipe；30- igniting processes；40- compression strokes；50- expansion strokes；60- exhaust strokes；70- induction strokes；100-
Single oil injection type engine system；The mono- fuel injectors of 101-；The bis- fuel injection engine systems of 200-.
Specific implementation mode
Fuel injection system proposed by the present invention and method are made below in conjunction with the drawings and specific embodiments further detailed
Explanation.According to following explanation and claims, advantages and features of the invention will become apparent from.It should be noted that attached drawing is adopted
Use with very simplified form and non-accurate ratio, only to it is convenient, lucidly aid in illustrating the embodiment of the present invention
Purpose.
Core of the invention thought is to provide under a kind of catalyst converter heating cycle, mixes abundant, combustion stablized fuel oil
Spraying system and strategy further increase the level of catalyst converter heating, into one to allow the angle of ignition further to be postponed
Step reduces gaseous effluent and particle emission.
To realize above-mentioned thought, the present invention provides a kind of engine system and its fuel-injecting method, engine systems
Including fuel injection system, combustion chamber, inlet manifold, inlet valve, piston, fuel injection system includes the first fuel injector and second
Fuel injector.Fuel-injecting method includes the following steps：It sprays for the first time：Before air inlet top dead centre, the first fuel injector is from air inlet qi
Spray fuel oil in Guan Zhongxiang inlet valves direction；Second of injection：Second fuel injector sprays remaining combustion out of combustion chamber to piston direction
Oil.
<First embodiment>
As shown in figure 4, Fig. 4 is engine system structural schematic diagram in first embodiment of the invention.Double fuel injection engines
System 200 includes fuel injection system, and combustion chamber 10, inlet manifold 8, inlet valve 4, piston 6, fuel injection system includes first
Fuel injector 2 and the second fuel injector 7, wherein the first fuel injector 2 sprays fuel oil into motor intake manifold 8, after so that fuel oil is sprayed
Incorporation time is longer, is sufficiently mixed with the air in inlet manifold, and the second fuel injector 7 sprays combustion into engine chamber 10
Oil.Combustion chamber 10 connects inlet manifold 8, and is separated by inlet valve 4, and piston 6 is located at the lower end of combustion chamber 10.Double oil injection types start
Machine system 200 further includes spark plug 3, exhaust valve 5, exhaust pipe 9.Wherein, ternary catalyzing unit 1 is located in exhaust pipe 9, engine cylinder
Interior 10 burning gases can be discharged by exhaust pipe 9, and when by ternary catalyzing unit 1, catalyst converter 1 is heated, and catalyst converter 1 will
Gas purification is handled.Fuel injection system in the present embodiment can take more flexible fuel oil to spray due to double injection systems
Strategy and method.
First fuel injector 2 is low pressure fuel injector device, injection pressure ranging from 0.3~0.45 megapascal of the first fuel injector.First
Fuel injector 2 is more than total fuel injection quantity overwhelming majority fuel oil in a complete job cycle, the second spray to the injection of 4 direction of the inlet valve
Oily device 7 sprays the remaining very little part fuel oil of total fuel injection quantity in a complete job cycle to 6 direction of the piston.In this reality
It applies in example, the second fuel injector 7 is from 10 top jet of combustion chamber, and the first fuel injector 2 sprays the 85%~95% of total oil mass, the second spray
Oily device 7 sprays the 5%~15% of total oil mass.The injection of first fuel injector is happened at before the air inlet top dead centre, the first fuel injector 2
It is sprayed to inlet manifold 8 instead of direct-injection in original combustion chamber, can be longer with air mixture time, it is more fully mixed.
Second fuel injector 7 is high pressure fuel injector, and the maximum injection pressure of the second fuel injector is between 15~35 megapascal.In figure
It is shown, the second fuel injector 7 from 10 top jet of combustion chamber when, close to spark plug 3.Second fuel injector 7 is sprayed to 6 direction of the piston
Penetrate in complete job cycle in total fuel injection quantity remaining fuel oil after the injection of the first fuel injector 2, it is therefore preferable to 5%~15%.
The injection of second fuel injector 7, which is happened at 6 near of piston and retains in combustion chamber, sprays, and is formed about in spark plug 3
Denseer charge stratification, while generating turbulent flow, further improves the stability of burning, to allow the angle of ignition obtain into
One step is postponed, and is further increased the level of catalyst converter heating, is further decreased gaseous effluent and particle emission.
<Second embodiment>
As shown in figure 5, Fig. 5 is engine system structural schematic diagram in second embodiment of the invention.With first embodiment
Difference lies in：Second fuel injector 7 of the present embodiment is side, is sprayed from the upper lateral part of combustion chamber 10, and the second fuel injector 7 sprays
It penetrates and is happened at after the air inlet top dead centre.
When the second fuel injector 7 is sprayed from 10 upper lateral part of combustion chamber, the first fuel injector 2 spray total oil mass 50%~
70%, the second fuel injector 7 sprays the 30%~50% of total oil mass.
Fuel injection system in the present embodiment can obtain mixing gaseous mixture the most sufficient, can substantially improve rear afterflame
It burns, improves combustion stability, the angle of ignition can obtain larger postponement, improve catalyst converter heat levels.
<3rd embodiment>
As shown in fig. 6, Fig. 6 is third embodiment of the invention intermediate fuel oil injection method fate map.
The fuel-injecting method of the present embodiment, under catalyst converter heating cycle, including the following steps：It sprays for the first time：
Before air inlet top dead centre, the first fuel injector sprays total oil spout in a complete job cycle in inlet manifold to inlet valve direction
Most of fuel oil of amount；Second of injection：Second fuel injector sprays a complete job cycle to piston direction in the combustion chamber
The Fuel Remained of middle total fuel injection quantity.
In the present embodiment, the second fuel injector sprays fuel oil from top of combustion chamber, and second of injection is happened in piston compression
Near stop.Second of injection is lighted a fire after completing a period of time.The amount of fuel of injection is that a complete job follows for the first time
Total fuel injection quantity 85%~95% in ring, the amount of fuel of second injection be total fuel injection quantity 5% in a complete job cycle~
15%.First fuel injector is low pressure fuel injector device, injection pressure ranging from 0.3~0.45 megapascal.Second fuel injector is high pressure fuel injector
Device, maximum injection pressure is between 15~35 megapascal.
In figure, the entire working cycles of engine include exhaust stroke 60, induction stroke 70, compression stroke 40 and expansion stroke
50, it is air inlet top dead centre 11, air inlet lower dead center 12 respectively wherein there are three time point；Compression top center 13；Wherein, it is compressing
After top dead centre 13, there are one igniting process-time points 30.
Wherein, between air inlet stop 11 and air inlet lower dead center 12 it is induction stroke 70, stops in air inlet lower dead center 12 and compression
It is compression stroke 40 between point 13.
The fuel-injecting method includes the following steps：Before air inlet top dead centre 11, the first fuel injector 2 is in inlet manifold 8
Most of fuel oil of total fuel injection quantity, i.e., injection process 23 in first time inlet manifold in one complete job cycle of middle injection；
Before air inlet top dead centre 11, injection process 23 continues for some time in first time inlet manifold, and terminates before air inlet top dead centre 11.
This injection is happened in inlet manifold.
Then, the second fuel injector 7 is sprayed from 10 tops in combustion chamber to piston direction always sprays in a complete job cycle
The Fuel Remained of oil mass, preferably 5%~15%, i.e. injection process 22 in second of combustion chamber, are happened at compression top center 13
Near.
Finally, spark plug 3 is lighted a fire, that is, process 30 of lighting a fire, after igniting is happened at compression top center 13.
In the present embodiment, most of fuel oil is 85%~95% of total fuel injection quantity in a complete job cycle.Fuel oil sprays
Shooting method is used under 1 heating cycle of catalyst converter.The fuel oil is sufficiently mixed with air.
Using this new mixing jetting strategy, it can further improve the gaseous mixture mixed process after spraying for the first time,
The combustion stability of engine, ignition advance angle are further postponed under the operating mode further promoted, and ternary catalyzing unit can
With quickly speed ignition, gaseous effluent is further decreased.Simultaneously as most of fuel oil mixing of injection for the first time
Process is abundant, and the amount of fuel of the second injection is seldom, reduces wet wall phenomenon, particle emission will significantly be dropped under the operating mode
Low, this meets harsh particulate emission regulation to vehicle and provides good basis.
<Fourth embodiment>
As shown in fig. 7, Fig. 7 is fourth embodiment of the invention intermediate fuel oil injection method fate map.With the area of 3rd embodiment
It is not：In the fuel-injecting method of the present embodiment, the second fuel injector is sprayed from combustion chamber side top to piston, second of injection
Occur after intake top dead center, and can carry out that preferred time for spraying and injecting times are calculated by simulation software.
Preferably, the injecting times one of second of injection are to twice.The amount of fuel of injection is total in a complete job cycle for the first time
Distributive value 50%~70%.The amount of fuel of second of injection is total fuel injection quantity 30%~50% in a complete job cycle.
The remaining combustion of step the second fuel injector 7 total fuel injection quantity in one complete job cycle of injection in combustion chamber 10
Oil occurs in the second 7 side of fuel injector in the intake stroke, i.e., between air inlet top dead centre 11 and air inlet lower dead center 12.Second
The time for spraying and injecting times of secondary injection optimize.Can according to optimization as a result, design injecting times and time for spraying,
Preferably, occur one to twice.
The fuel injector side injection strategy for comparing the prior art, engine under the operating mode that new injection strategy is significantly promoted
Combustion stability, ignition advance angle is able to postpone 15 ° of crank angle or more, and delivery temperature increases 150 DEG C or more, three-element catalytic
Device is able to quickly ignition, and significant reduction can be obtained in gaseous effluent.Meanwhile using new injection strategy, due to improving
Burning, reduces wet wall phenomenon, particle emission is greatly reduced under the operating mode, and particle emission is reduced to original
1/10th provide good basis hereinafter, this meets harsh particulate emission regulation to vehicle.Further, due to the spray
The homogeneous combustion that strategy promotes gaseous mixture is penetrated, thus it is of less demanding to Combustion chamber design and In Cylinder Flow cooperation, to design
It is also not high with the deviation requirement of manufacture, it is insensitive to the variation interference of key parameter, so the Injection strategy has good Shandong
Stick.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.For system disclosed in embodiment
For, due to corresponding to the methods disclosed in the examples, so description is fairly simple, related place is referring to method part illustration
.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair
Any change, the modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims
Range.
Claims (17)
1. a kind of engine system, which is characterized in that the engine system includes fuel injection system, combustion chamber, air inlet discrimination
Pipe, inlet valve, piston, wherein：
The fuel injection system includes the first fuel injector and the second fuel injector, before air inlet top dead centre, the first fuel injector into
In gas menifold fuel oil is sprayed to inlet valve direction；Second fuel injector carries out second to piston direction in the combustion chamber and sprays, spray
Penetrate remaining fuel oil；
The combustion chamber connects the inlet manifold, and is separated by the inlet valve；
The piston is located at the lower end of the combustion chamber.
2. engine system as described in claim 1, which is characterized in that first fuel injector is sprayed to the inlet valve direction
Penetrate the fuel oil of total fuel injection quantity 50%~90% in a complete job cycle.
3. engine system as described in claim 1, which is characterized in that second fuel injector is sprayed to the piston direction
The fuel oil of total fuel injection quantity 10%~50% in one complete job cycle.
4. engine system as described in claim 1, which is characterized in that second fuel injector is sprayed from top of combustion chamber and fired
Oil.
5. engine system as claimed in claim 4, which is characterized in that the second fuel injector injection is happened in compression only
Near point.
6. engine system as described in claim 1, which is characterized in that second fuel injector is sprayed from combustion chamber side top
Fuel oil.
7. engine system as claimed in claim 6, which is characterized in that the second fuel injector injection is happened in air inlet only
After point.
8. a kind of fuel-injecting method, which is characterized in that the fuel-injecting method includes the following steps：
It sprays for the first time：Before air inlet top dead centre, the first fuel injector sprays one completely in inlet manifold to inlet valve direction
The part fuel oil of total fuel injection quantity in working cycles；
Second of injection：Second fuel injector sprays total fuel injection quantity in a complete job cycle to piston direction in the combustion chamber
Remaining fuel oil after the first time injection.
9. fuel-injecting method as claimed in claim 8, which is characterized in that second fuel injector is sprayed from top of combustion chamber
Fuel oil.
10. fuel-injecting method as claimed in claim 9, which is characterized in that second of injection is happened in compression only
Near point.
11. fuel-injecting method as claimed in claim 10, which is characterized in that the amount of fuel of second of injection is one
Total fuel injection quantity 5%~15% in complete job cycle.
12. fuel-injecting method as claimed in claim 8, which is characterized in that second fuel injector is from combustion chamber side top
Spray fuel oil.
13. fuel-injecting method as claimed in claim 12, which is characterized in that second of injection is happened in air inlet only
After point.
14. fuel-injecting method as claimed in claim 13, which is characterized in that the amount of fuel of second of injection is one
Total fuel injection quantity 20%~40% in complete job cycle.
15. fuel-injecting method as claimed in claim 14, which is characterized in that the injecting times one of second of injection arrive
Twice.
16. fuel-injecting method as claimed in claim 8, which is characterized in that after a period of time is completed in second of injection
It lights a fire.
17. fuel-injecting method as claimed in claim 8, which is characterized in that the fuel-injecting method adds for catalyst converter
Under thermal condition.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710101471.5A CN108506133A (en) | 2017-02-24 | 2017-02-24 | A kind of engine system and its fuel-injecting method |
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| CN201710101471.5A CN108506133A (en) | 2017-02-24 | 2017-02-24 | A kind of engine system and its fuel-injecting method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5875743A (en) * | 1997-07-28 | 1999-03-02 | Southwest Research Institute | Apparatus and method for reducing emissions in a dual combustion mode diesel engine |
| CN1560440A (en) * | 2004-02-27 | 2005-01-05 | 清华大学 | Method of layering forming mixed gas for gasoline directly jetting type engine based multisection jetting |
| CN101057067A (en) * | 2004-11-11 | 2007-10-17 | 丰田自动车株式会社 | Control apparatus for internal combustion engine |
| CN100580240C (en) * | 2004-11-11 | 2010-01-13 | 丰田自动车株式会社 | Control apparatus for internal combustion engine |
| CN104373226A (en) * | 2013-08-15 | 2015-02-25 | 福特环球技术公司 | Variable displacement engine control system and method |
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2017
- 2017-02-24 CN CN201710101471.5A patent/CN108506133A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5875743A (en) * | 1997-07-28 | 1999-03-02 | Southwest Research Institute | Apparatus and method for reducing emissions in a dual combustion mode diesel engine |
| CN1560440A (en) * | 2004-02-27 | 2005-01-05 | 清华大学 | Method of layering forming mixed gas for gasoline directly jetting type engine based multisection jetting |
| CN101057067A (en) * | 2004-11-11 | 2007-10-17 | 丰田自动车株式会社 | Control apparatus for internal combustion engine |
| CN100580240C (en) * | 2004-11-11 | 2010-01-13 | 丰田自动车株式会社 | Control apparatus for internal combustion engine |
| CN104373226A (en) * | 2013-08-15 | 2015-02-25 | 福特环球技术公司 | Variable displacement engine control system and method |
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