CN101338694A - Method and system for in-cylinder direct-injection gasoline engine stratified equivalent proportion combustion - Google Patents
Method and system for in-cylinder direct-injection gasoline engine stratified equivalent proportion combustion Download PDFInfo
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- CN101338694A CN101338694A CN 200810118653 CN200810118653A CN101338694A CN 101338694 A CN101338694 A CN 101338694A CN 200810118653 CN200810118653 CN 200810118653 CN 200810118653 A CN200810118653 A CN 200810118653A CN 101338694 A CN101338694 A CN 101338694A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 45
- 238000002347 injection Methods 0.000 title claims abstract description 45
- 239000007924 injection Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000000446 fuel Substances 0.000 claims abstract description 42
- 230000008569 process Effects 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims description 32
- 238000007906 compression Methods 0.000 claims description 18
- 239000007921 spray Substances 0.000 claims description 11
- 230000006835 compression Effects 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 3
- 238000009841 combustion method Methods 0.000 abstract description 13
- 239000003054 catalyst Substances 0.000 abstract description 7
- 238000005474 detonation Methods 0.000 abstract 1
- 238000010304 firing Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 241000580063 Ipomopsis rubra Species 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The present invention discloses a direct injection gasoline engine stratified equivalent proportion combustion method which comprises the steps as follows: first fuel injection is processed during charging process, and homogeneous thin mixed gas is formed when an upper stop point is compressed; second or multiple fuel injections are processed during compressing process, and a dense mixed gas area is formed around a spark plug; the spark plug ignites to burn the fuel. The present invention also discloses a direct injection gasoline engine stratified equivalent proportion combustion system which comprises an oil atomizer, an electric control unit and the spark plug. When the method and the system of the present invention are used, harmful emission produced by gasoline delaminated equivalent proportion mixed gas combustion can be effectively controlled by the traditional gasoline engine three-way catalyst, thereby solving the problem that a first generation GDI stratified thin burning method has large difficulty for developing lean-burn catalyst and high cost and is not easy for controlling the discharge. At the same time, the stratified equivalent proportion combustion method can bring higher fuel economical efficiency than a second generation GDI homogeneous equivalent proportion combustion method and can inhibit detonation.
Description
Technical field
The present invention relates to technical field of internal combustion engines, particularly relate to a kind of method and system of in-cylinder direct-injection gasoline engine stratified equivalent proportion combustion.
Background technique
Direct spray petrol engine in cylinder can form the mixed gas of homogeneous or layering constantly by the control oil spout.The combustion method of the gasoline in-cylinder direct injection technology of having used at present mainly is divided into two kinds, i.e. layering lean combustion and homogeneous equivalent proportion burning.First generation GDI adopts the combustion method of layering lean combustion, mainly with 20th century the nineties Mitsubishi, Toyota and company such as daily output be representative, utilize internal combustion oil of cylinder to spray and form heterogeneous stratified mixtures, guarantee the instantaneous rich mixture that is easy to catch fire that around spark plug, forms of igniting, and all the other zones, firing chamber are weak mixture, but are excess air coefficient on the whole much larger than 1 lean combustion.But because layering lean-burn GDI motor can't use three-way catalyst, and the difficulty of lean-burn catalyst development and cost are very high, therefore along with constantly adding of Abgasgesetz tight this combustion method be restricted.
Second generation GDI adopts the combustion method of homogeneous equivalent proportion, form spark ignition behind the homogeneous charge by early spraying fuel in the cylinder in the aspirating stroke, remain under the stoichiometric proportion and work, thereby can adopt ripe three-way catalyst technology effectively to control engine emission like this.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art: wherein, 11 is oil sprayer, 12 is spark plug, and 13 are air inlet, and 14 are exhaust, 15 is the stoichiometric proportion homogeneous charge, and it fires empty equivalent proportion λ=1.0,16 is terminal mixed gas spontaneous combustion.Because second generation GDI has adopted equivalent proportion homogeneous charge ignition combustion pattern, so the pinking easily under the low speed high load working condition of conventional gasoline machine.The mechanism of its pinking as shown in Figure 1, at the low speed high load working condition, velocity of propagation of flame is slow, spontaneous combustion by compression and thermal radiation takes place in chamber wall surface temperature height, terminal equivalent proportion mixed gas, form local temperature pressure and skyrocket, shock wave impacts combustion chamber wall surface and produces the high frequency sound that shakes.
Summary of the invention
The problem that the embodiment of the invention will solve provides a kind of method and system of in-cylinder direct-injection gasoline engine stratified equivalent proportion combustion, owing to adopt equivalent proportion homogeneous charge ignition combustion pattern, and cause conventional gasoline machine defective of pinking easily under the low speed high load working condition to overcome in the prior art.
For achieving the above object, the technological scheme of the embodiment of the invention provides a kind of method of in-cylinder direct-injection gasoline engine stratified equivalent proportion combustion, said method comprising the steps of: in intake process, carry out the fuel injection first time, when compression top center, form the homogeneous weak mixture; In compression process, carry out the second time or multiple fuel injection, around spark plug, form the rich mixture zone; Plug ignition burns described fuel.
Wherein, described in compression process, carry out for the second time or the step of multiple fuel injection after, mixed gas integral body is in stoichiometric proportion in the cylinder.
Wherein, the empty equivalent proportion λ of the combustion of described weak mixture＞1.
Wherein, the scope of the empty equivalent proportion λ of the combustion of described weak mixture is 1.2～2.0.
Wherein, the empty equivalent proportion λ of the combustion of described rich mixture＜1.
Wherein, the scope of the empty equivalent proportion λ of the combustion of described rich mixture is 0.7～0.9.
Wherein, spray into 3/4 of total amount of fuel in the step that the described first time, fuel sprayed, spray into 1/4 of total amount of fuel in the step of the described second time or multiple fuel injection.
The technological scheme of the embodiment of the invention also provides a kind of system of in-cylinder direct-injection gasoline engine stratified equivalent proportion combustion, and described system comprises: oil sprayer is used for spraying into fuel in cylinder; ECU (Electrical Control Unit), the oil spout that is used to control described oil sprayer constantly and fuel injection quantity make described oil sprayer carry out fuel injection first time in intake process, carry out the second time or multiple fuel injection in compression process; Spark plug is used to light described fuel.
Compared with prior art, technological scheme of the present invention has following advantage:
Adopt when of the present invention, the noxious emission that gasoline layering equivalent proportion mixture combustion produces, can use conventional gasoline machine three-way catalyst to control effectively, solve that first generation GDI layering lean combustion method lean-burn catalyst development difficulty is big, cost is high, discharges uppity problem.Simultaneously, the combustion method of layering equivalent proportion can bring than the higher fuel economy of second generation GDI homogeneous equivalent proportion combustion method, and can suppress the generation of pinking.
Description of drawings
Fig. 1 is the mechanism schematic representation that a kind of petrol engine pinking of prior art takes place;
Fig. 2 is the flow chart of a kind of in-cylinder direct-injection gasoline engine stratified equivalent proportion combustion method of the embodiment of the invention;
Fig. 3 is the structural representation of a kind of gasoline direct injection engines stratified equivalent proportion combustion system of the embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
The method of a kind of in-cylinder direct-injection gasoline engine stratified equivalent proportion combustion of the embodiment of the invention may further comprise the steps as shown in Figure 2:
Step s201 carries out the fuel injection first time in intake process, form the homogeneous weak mixture when compression top center.The empty equivalent proportion λ of the combustion of described weak mixture＞1, its scope can be 1.2～2.0.
Step s202 carries out the second time or multiple fuel injection in compression process, form the rich mixture zone around spark plug.The empty equivalent proportion λ of the combustion of described rich mixture＜1, its scope can be 0.7～0.9.At this moment, mixed gas integral body is in stoichiometric proportion in the cylinder.
Step s203, plug ignition burns described fuel.
The structural representation of a kind of gasoline direct injection engines stratified equivalent proportion combustion system of the embodiment of the invention as shown in Figure 3, wherein, 31 is oil sprayer, 32 is spark plug, and 33 are air inlet, and 34 are exhaust, 35 is the rich mixture district, it fires empty equivalent proportion λ=0.7～0.9, and 16 is the weak mixture district, and it fires empty equivalent proportion λ=1.2～2.0.This combustion system cylinder bore is 95 millimeters, and compression ratio is 11, is 60 ° high pressure cyclone umbrella spray gasoline electric-controlled fuel injector with cone angle, adopts twice injection.In in same work cycle, the fuel injection pulse signal that provides according to ECU (Electrical Control Unit) (control oil spout constantly and fuel injection quantity), carrying out the first time in intake process sprays, spray into 3/4 fuel, oil spout is 100 ° of air inlet atdc constantly, and these fuel have formed the homogeneous weak mixture when compression top center; Carrying out the second time then in compression process sprays, spray into 1/4 fuel, mixed gas integral body in the cylinder is adjusted to stoichiometric proportion, oil spout is preceding 100 ° of compression top center constantly, owing to have little time fully to spread and be subjected to the restriction of combustion recess, form than rich mixture in the center region, firing chamber.Like this, when compression top center, inflammable mixture forms two different zones of concentration in the cylinder, near the time of ignition spark plug is the rich mixture of air excess factor＜1, on every side for firing the weak mixture of empty equivalent proportion λ＞1, be in stoichiometric ratio on the whole, promptly form the mixed gas of layering equivalent proportion.From test result as can be known, adopt stratified equivalent proportion combustion method (the compression stroke secondary injection forms stratified mixtures) than homogeneous equivalent proportion combustion method (aspirating stroke is sprayed and formed homogeneous charge), the back inflammable mixture velocity of combustion of catching fire is fast, thermal efficiency height.
The present invention is by carrying out twice or multiple fuel injection in cylinder, form the mixed gas of the stoichiometric ratio of concentration stratification, be center, firing chamber (around the spark plug) mixed gas denseer, and periphery is a weak mixture, but still is stoichiometric proportion on the whole than stoichiometric proportion.Owing to around the instantaneous spark plug of igniting, be in the rich mixture district, can accelerate velocity of combustion, shorten the time that the flame front face arrives edge of combustion chamber; Secondly, layering makes that the firing chamber is a weak mixture away from the zone that pinking easily takes place spark plug, its involuntary ignition may be littler than equivalent mixed gas, and near compression top center, carry out secondary and three injections can reduce cylinder temperature, so just make the tendency that pinking takes place weaken.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1, a kind of method of in-cylinder direct-injection gasoline engine stratified equivalent proportion combustion is characterized in that, said method comprising the steps of:
In intake process, carry out the fuel injection first time, when compression top center, form the homogeneous weak mixture;
In compression process, carry out the second time or multiple fuel injection, around spark plug, form the rich mixture zone;
Plug ignition burns described fuel.
2, the method for in-cylinder direct-injection gasoline engine stratified equivalent proportion combustion according to claim 1 is characterized in that, carries out in compression process for the second time or after the step of multiple fuel injection, mixed gas integral body is in stoichiometric proportion in the cylinder described.
3, the method for in-cylinder direct-injection gasoline engine stratified equivalent proportion combustion according to claim 1 is characterized in that, the empty equivalent proportion λ of the combustion of described weak mixture＞1.
As the method for in-cylinder direct-injection gasoline engine stratified equivalent proportion combustion as described in the claim 3, it is characterized in that 4, the scope of the empty equivalent proportion λ of the combustion of described weak mixture is 1.2～2.0.
5, the method for in-cylinder direct-injection gasoline engine stratified equivalent proportion combustion according to claim 1 is characterized in that, the empty equivalent proportion λ of the combustion of described rich mixture＜1.
As the method for in-cylinder direct-injection gasoline engine stratified equivalent proportion combustion as described in the claim 5, it is characterized in that 6, the scope of the empty equivalent proportion λ of the combustion of described rich mixture is 0.7～0.9.
7, the method for in-cylinder direct-injection gasoline engine stratified equivalent proportion combustion according to claim 1 is characterized in that, sprays into 3/4 of total amount of fuel in the step that the described first time, fuel sprayed, and sprays into 1/4 of total amount of fuel in the step of the described second time or multiple fuel injection.
8, a kind of system of in-cylinder direct-injection gasoline engine stratified equivalent proportion combustion is characterized in that, described system comprises:
Oil sprayer is used for spraying into fuel in cylinder;
ECU (Electrical Control Unit), the oil spout that is used to control described oil sprayer constantly and fuel injection quantity make described oil sprayer carry out fuel injection first time in intake process, carry out the second time or multiple fuel injection in compression process;
Spark plug is used to light described fuel.
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| CN 200810118653 CN101338694B (en) | 2008-08-21 | 2008-08-21 | Method for in-cylinder direct-injection gasoline engine stratified equivalent proportion combustion |
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| CN 200810118653 CN101338694B (en) | 2008-08-21 | 2008-08-21 | Method for in-cylinder direct-injection gasoline engine stratified equivalent proportion combustion |
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| CN101338694B CN101338694B (en) | 2011-01-26 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102182608A (en) * | 2011-03-16 | 2011-09-14 | 奇瑞汽车股份有限公司 | Combustion system of gasoline direct injection engine and control method thereof |
| CN103334846A (en) * | 2013-07-23 | 2013-10-02 | 清华大学 | Method for judging and controlling super detonation |
| CN103670761A (en) * | 2012-09-19 | 2014-03-26 | 本田技研工业株式会社 | Combustion control device for internal combustion engine and combustion method for homogeneous lean air/fuel mixture |
| CN105201670A (en) * | 2015-09-08 | 2015-12-30 | 清华大学 | Method and device for inhibiting super-knock of supercharged direct-injection engine |
| WO2016119554A1 (en) * | 2015-01-27 | 2016-08-04 | 江铃汽车股份有限公司 | Method for controlling super-knocks of direct-injection supercharged gasoline engine |
| CN109424459A (en) * | 2017-08-25 | 2019-03-05 | 马自达汽车株式会社 | The control device of engine |
| CN109424460A (en) * | 2017-08-25 | 2019-03-05 | 马自达汽车株式会社 | The control device of compression ignition formula engine |
| CN113153594A (en) * | 2021-02-07 | 2021-07-23 | 联合汽车电子有限公司 | Lean combustion system and method |
| CN113417753A (en) * | 2021-07-30 | 2021-09-21 | 广西玉柴机器股份有限公司 | Control method for improving cold start of engine |
-
2008
- 2008-08-21 CN CN 200810118653 patent/CN101338694B/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102182608A (en) * | 2011-03-16 | 2011-09-14 | 奇瑞汽车股份有限公司 | Combustion system of gasoline direct injection engine and control method thereof |
| CN103670761A (en) * | 2012-09-19 | 2014-03-26 | 本田技研工业株式会社 | Combustion control device for internal combustion engine and combustion method for homogeneous lean air/fuel mixture |
| US9273661B2 (en) | 2012-09-19 | 2016-03-01 | Honda Motor Co., Ltd. | Combustion control device for internal combustion engine and combustion method for homogeneous lean air/fuel mixture |
| CN103670761B (en) * | 2012-09-19 | 2016-05-18 | 本田技研工业株式会社 | The combustion method of the combustion control device of internal combustion engine and homogeneous Weak mixture |
| CN103334846A (en) * | 2013-07-23 | 2013-10-02 | 清华大学 | Method for judging and controlling super detonation |
| CN103334846B (en) * | 2013-07-23 | 2016-03-30 | 清华大学 | A kind of judgement of super detonation and controlling method |
| WO2016119554A1 (en) * | 2015-01-27 | 2016-08-04 | 江铃汽车股份有限公司 | Method for controlling super-knocks of direct-injection supercharged gasoline engine |
| CN105201670A (en) * | 2015-09-08 | 2015-12-30 | 清华大学 | Method and device for inhibiting super-knock of supercharged direct-injection engine |
| CN109424459A (en) * | 2017-08-25 | 2019-03-05 | 马自达汽车株式会社 | The control device of engine |
| CN109424460A (en) * | 2017-08-25 | 2019-03-05 | 马自达汽车株式会社 | The control device of compression ignition formula engine |
| CN109424460B (en) * | 2017-08-25 | 2021-10-12 | 马自达汽车株式会社 | Control device for compression ignition engine |
| CN113153594A (en) * | 2021-02-07 | 2021-07-23 | 联合汽车电子有限公司 | Lean combustion system and method |
| CN113417753A (en) * | 2021-07-30 | 2021-09-21 | 广西玉柴机器股份有限公司 | Control method for improving cold start of engine |
| CN113417753B (en) * | 2021-07-30 | 2023-02-03 | 广西玉柴机器股份有限公司 | Control method for improving cold start of engine |
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| CN101338694B (en) | 2011-01-26 |
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