CN104500247B - Combustion control method for all-condition plane of direct-injection compression-ignition engine - Google Patents
Combustion control method for all-condition plane of direct-injection compression-ignition engine Download PDFInfo
- Publication number
- CN104500247B CN104500247B CN201410742566.1A CN201410742566A CN104500247B CN 104500247 B CN104500247 B CN 104500247B CN 201410742566 A CN201410742566 A CN 201410742566A CN 104500247 B CN104500247 B CN 104500247B
- Authority
- CN
- China
- Prior art keywords
- injection
- fuel
- load
- pattern
- degree
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention provides a combustion control method for the all-condition plane of a direct-injection compression-ignition engine. The method comprises the following steps: carrying out single injection within the crank angle (CA) of 10- 40 degrees before compressing the top dead center; when the engine is in a medium load or a low-speed high load, carrying out single injection or twice injection within the CA of 20-120 degrees before compressing the top dead center at a first stage; carrying out single injection within the CA of minus 5 to 10 degrees after compressing the top dead center at a second stage; when the engine is in the high-speed high load, carrying out single injection or twice injection within the CA of 30-150 degrees before compressing the top dead center; carrying out single injection within 0-30 degrees before compressing the top dead center; allowing a stratified mixture of gases to form in a cylinder. Through adoption of the method provided by the invention, the normal running of the all-condition plane of the direct-injection compression-ignition engine can be realized, so that the dependence on EGR is reduced.
Description
Technical field
The present invention relates to automobile engine, combustion in IC engine technical field are and in particular to a kind of direct-injection compression-ignition engine is complete
Operating mode plane method for controlling combustion.
Background technology
Gasoline direct compression-ignition engine is a kind of internal combustion engine, it is possible to use different octane gasoline-like fuel, can
Significantly improve the gasoline engine thermal efficiency, meet or exceed diesel engine level.Simultaneously because the longer delay period of gasoline-like fuel, energy
So that oil gas is sufficiently mixed, no is greatly decreasedxAnd soot emissions.International study hotspot is had become as over nearly 3 years.
Gasoline direct compression-ignition engine is all using ppci (partially premixed compression at present
Ignition, partly-premixed compression ignition) pattern, before catching fire, complete all oil spouts.But this combustion system load range is relatively
Narrow, high load capacity is rapid due to heat release, leads to the rate of pressure rise high, combustion noise is big, and is difficult to meet the requirement of transient condition.
In order to reduce noxDischarge is it is necessary to adopt egr (exhaust gas recirculation, exhaust gas recirculatioon) at high proportion, this gives
Electromotor practical application brings very big obstacle.
Therefore, needing badly provides a kind of method for controlling combustion so that reducing the dependence that egr is used or the use of reduction egr
Ratio.
Content of the invention
For the deficiencies in the prior art, the present invention provides a kind of direct-injection compression-ignition engine full working scope plane Combustion System side
Method, is normally run with the full working scope plane realizing gasoline-like fuel direct-injection compression-ignition engine, reduces the dependence that egr is used.
For achieving the above object, the present invention is achieved by the following technical programs:
A kind of direct-injection compression-ignition engine full working scope plane method for controlling combustion, comprising:
When electromotor is in underload, using single injection event ppci pattern, before compression top center, 10 to 40 write music axle
Single injection event within corner ca, sprays into 100% fuel, injection pressure is in below 60mpa；
Load and during low speed high load in electromotor is in, using multistage Premixed combustion mpci pattern, the first stage,
Single or spray twice within 20 to 120 degree ca before compression top center, sprays into 40%～70% fuel, injection pressure exists
More than 20mpa；Second stage, single injection event within -5 to 10 degree of ca after compression top center, spray into 30%～60% fuel,
Injection pressure is in more than 20mpa；Wherein, the first stage sprays into fuel and the fuel sum that second stage sprays into are 100%；
When electromotor is in high-speed high-load, using multi-injection ppci pattern, 30 to 150 degree before compression top center
Single or spray twice within ca, sprays into 40%～70% fuel, injection pressure in more than 15mpa, then in compression only
Single injection event within front 0 to 30 degree of point, sprays into 30%～60% fuel, forms stratified mixtures in cylinder, injection pressure exists
More than 15mpa；Wherein, within 30 to 150 degree ca before compression top center, single or the fuel spraying twice stop with compression
Within front 0 to 30 degree of point, the fuel sum of single injection event is 100%.
Wherein, electromotor be in underload and using single injection event ppci pattern when, according to operating mode select pressure ratio and
Different proportion cools down egr, and its egr leads and is less than 10%, and excess air coefficient is more than 2.
Wherein, load and low speed high load and during using multistage Premixed combustion mpci pattern in electromotor is in, according to
Operating mode selects pressure ratio and different proportion cooling egr, and its egr leads and is less than 40%, and excess air coefficient is 1～2.5.
Wherein, when electromotor is in high-speed high-load and adopts multi-injection ppci pattern, supercharging is selected according to operating mode
Cool down egr than with different proportion, its egr leads and is less than 45%, excess air coefficient is 1～2.
By above description, direct-injection compression-ignition engine full working scope plane method for controlling combustion of the present invention, can
Normally run with the full working scope plane realizing gasoline-like fuel direct-injection compression-ignition engine, reduce the dependence that egr is used.
In addition, direct-injection compression-ignition engine full working scope plane method for controlling combustion of the present invention can also realize gasoline class
Efficient, the low emission of direct fuel injection compression-ignition engine.
In addition, direct-injection compression-ignition engine full working scope plane method for controlling combustion of the present invention mainly to Injection strategy and
Air inlet strategy is optimized, and engine intake and exhaust system significantly need not be transformed, low cost, and industrialization prospect is good.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description are the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 shows gasoline-like fuel direct-injection compression-ignition engine operating mode floor map.
Specific embodiment
Purpose, technical scheme and advantage for making the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is carried out with clear, complete description it is clear that described embodiment is
The a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment being obtained under the premise of not making creative work, broadly falls into the scope of protection of the invention.
Embodiments provide a kind of direct-injection compression-ignition engine full working scope plane method for controlling combustion, the method bag
Include:
When electromotor is in underload, using single injection event ppci pattern, 10 to 40 degree ca before compression top center
Single injection event within (crank angle, crank angle), sprays into 100% fuel, injection pressure is in below 60mpa；
Load and during low speed high load in electromotor is in, using mpci (multiple premixed
Compression ignition, multistage Premixed combustion) pattern, the first stage, within 20 to 120 degree ca before compression top center
Single or spray twice, sprays into 40%～70% fuel, injection pressure is in more than 20mpa；Second stage, in compression top center
Single injection event within -5 to 10 degree of ca, sprays into 30%～60% fuel, injection pressure is in more than 20mpa afterwards；Wherein, the first rank
The fuel sum that the fuel that sprays into of section and second stage spray into is 100%；
When electromotor is in high-speed high-load, using multi-injection ppci pattern, 30 to 150 degree before compression top center
Single or spray twice within ca, sprays into 40%～70% fuel, injection pressure in more than 15mpa, then in compression only
Single injection event within front 0 to 30 degree of point, sprays into 30%～60% fuel, forms stratified mixtures in cylinder, injection pressure exists
More than 15mpa；Wherein, within 30 to 150 degree ca before compression top center, single or the fuel spraying twice stop with compression
Within front 0 to 30 degree of point, the fuel sum of single injection event is 100%.
Direct-injection compression-ignition engine full working scope plane method for controlling combustion described in the embodiment of the present invention, it is possible to achieve gasoline class
The full working scope plane of direct fuel injection compression-ignition engine is normally run, and reduces the dependence that egr is used.
In addition, the direct-injection compression-ignition engine full working scope plane method for controlling combustion described in the embodiment of the present invention can also be realized
Efficient, the low emission of gasoline-like fuel direct-injection compression-ignition engine.
In addition, the direct-injection compression-ignition engine full working scope plane method for controlling combustion described in the embodiment of the present invention is mainly to oil spout
Strategy and air inlet strategy are optimized, and engine intake and exhaust system significantly need not be transformed, low cost, industrialization prospect
Good.
Gasoline-like fuel direct-injection compression-ignition engine full working scope plane is divided into 3 regions by the embodiment of the present invention.Fig. 1 is operating mode
Floor map.In figure transverse axis r represents engine speed, and longitudinal axis l represents engine load, and i is low-load region, and in figure ii is
Middle load and middle and slow speed of revolution high-load region, in figure iii is high rotating speed high-load region.Wherein full working scope plane Combustion System side
Method particularly as follows:
A. in underload, i.e. the i region of in figure, using the single injection strategy close to compression top center, realize single
Injection ppci pattern, before compression top center between 10 to 40 crank angle degrees ca, injection pressure is in 60mpa for concrete time for spraying
Below.Pressure ratio and different proportion cooling egr are selected according to operating mode, egr leads and is less than 10%, and excess air coefficient is more than simultaneously
2.
B. in middle load and low speed high load, i.e. the ii region of in figure, using multi-injection strategy, realize multistage premix
Compression ignition mpci pattern, concrete time for spraying is to spray using single or twice within 20 to 120 degree ca before compression top center, sprays into
40%～70% fuel, it is ensured that realizing first stage heat release near, then -5 arrives after compression top center
Adopting single injection event within 10 degree of ca, spraying into 30%～60% fuel it is ensured that realizing second stage heat release.Injection pressure exists
More than 20mpa.Pressure ratio and different proportion cooling egr are selected according to operating mode, egr leads and is less than 40%, excess air system simultaneously
Number is 1～2.5.
Wherein, mpci pattern be noteworthy characterized by using a kind of near according to " oil spout-burning-oil spout-
The sequential system tissue burning of burning ", different from the combustion method of ppci pattern " oil spout-oil spout-burning ".In theory,
Mpci pattern can repeat " oil spout-burning " combination repeatedly, but in order to ensure the burning after each oil spout is close to premixed combustion,
Every group of oil spout and combustion process should be separated as far as possible, and " oil spout-burning " combination therefore in practical application is less than three times.mpci
The feature of pattern is, directly controls mixed gas to form (premixed gas) and combustion heat release process (multistage by multiple oil spout
Burning), thus realizing in-cylinder pressure elevation process and the decoupling of pollutant generating process.That is, can be sprayed by regulation
Oily number of times, oil injection time, the parameter such as injection interval and oil spout ratio and rate of pressure rise during the big load of effective control and combustion
Burn noise, that is, control exothermic process；And noxDischarge Deng pollutant then can be by fuel injection control strategy to premixing each time
Combustion process carries out rationalization and makes it drop to very low level.
C. in high-speed high-load, i.e. the iii region of in figure, using multi-injection strategy, realize multi-injection ppci mould
Formula, concrete time for spraying is to spray using single or twice, then in compression only within 30 to 150 degree ca before compression top center
Adopt single injection event within front 0 to 30 degree of point, form stratified mixtures in cylinder.Injection pressure is in more than 15mpa.Simultaneously according to work
Condition select pressure ratio and in cool down egr at high proportion, egr lead be less than 45%, excess air coefficient be 1～2.
Above example is merely to illustrate technical scheme, is not intended to limit；Although with reference to the foregoing embodiments
The present invention has been described in detail, it will be understood by those within the art that: it still can be to aforementioned each enforcement
Technical scheme described in example is modified, or carries out equivalent to wherein some technical characteristics；And these are changed or replace
Change, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (4)
1. a kind of direct-injection compression-ignition engine full working scope plane method for controlling combustion is it is characterised in that include:
When electromotor is in underload, using single injection event ppci pattern, 10 to 40 crank angle degrees before compression top center
Single injection event within ca, sprays into 100% fuel, injection pressure is in below 60mpa；
Load and during low speed high load in electromotor is in, using multistage Premixed combustion mpci pattern, the first stage, in compression
Single or spray twice within before upper dead canter 20 to 120 degree ca, sprays into 40%～70% fuel, injection pressure 20mpa with
On；Second stage, single injection event within -5 to 10 degree of ca after compression top center, spray into 30%～60% fuel, injection pressure
Power is in more than 20mpa；Wherein, the first stage sprays into fuel and the fuel sum that second stage sprays into are 100%；
When electromotor is in high-speed high-load, using multi-injection ppci pattern, before compression top center 30 to 150 degree ca it
Interior single or spray twice, sprays into 40%～70% fuel, injection pressure in more than 15mpa, then 0 before compression top center
The single injection event within 30 degree, sprays into 30%～60% fuel, forms stratified mixtures in cylinder, injection pressure 15mpa with
On；Wherein, within 30 to 150 degree ca before compression top center, single or the fuel spraying twice arrive with before compression top center 0
Within 30 degree, the fuel sum of single injection event is 100%.
2. method according to claim 1 is it is characterised in that being in underload in electromotor and adopting single injection event ppci
During pattern, pressure ratio and different proportion cooling egr are selected according to operating mode, its egr leads and is less than 10%, and excess air coefficient is more than
2.
3. method according to claim 1 is it is characterised in that load and low speed high load and employing in electromotor is in
During multistage Premixed combustion mpci pattern, pressure ratio and different proportion cooling egr are selected according to operating mode, its egr leads and is less than 40%,
Excess air coefficient is 1～2.5.
4. method according to claim 1 is it is characterised in that being in high-speed high-load in electromotor and adopting multi-injection
During ppci pattern, pressure ratio and different proportion cooling egr are selected according to operating mode, its egr leads and is less than 45%, excess air coefficient
For 1～2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410742566.1A CN104500247B (en) | 2014-12-05 | 2014-12-05 | Combustion control method for all-condition plane of direct-injection compression-ignition engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410742566.1A CN104500247B (en) | 2014-12-05 | 2014-12-05 | Combustion control method for all-condition plane of direct-injection compression-ignition engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104500247A CN104500247A (en) | 2015-04-08 |
| CN104500247B true CN104500247B (en) | 2017-02-01 |
Family
ID=52941685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410742566.1A Active CN104500247B (en) | 2014-12-05 | 2014-12-05 | Combustion control method for all-condition plane of direct-injection compression-ignition engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104500247B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105201670A (en) * | 2015-09-08 | 2015-12-30 | 清华大学 | Method and device for inhibiting super-knock of supercharged direct-injection engine |
| CN106285985A (en) * | 2016-09-30 | 2017-01-04 | 广州汽车集团股份有限公司 | Petrol engine excess air coefficient method for controlling combustion and combustion control system |
| CN106499538B (en) * | 2016-11-01 | 2019-09-20 | 清华大学 | A kind of gasoline-like fuel direct-injection compression ignition hybrid power engine method for controlling combustion |
| CN108708795A (en) * | 2018-05-15 | 2018-10-26 | 北汽福田汽车股份有限公司 | Control the method, apparatus and vehicle of gasoline engine |
| CN113700569A (en) * | 2021-07-27 | 2021-11-26 | 东风汽车集团股份有限公司 | Fuel injection control method and device for direct injection engine, electronic equipment and storage medium |
| CN114412652B (en) * | 2022-03-29 | 2022-06-24 | 潍柴动力股份有限公司 | Engine combustion system control method and engine combustion system |
| CN116398311B (en) * | 2023-06-07 | 2023-08-18 | 潍柴动力股份有限公司 | Multi-strategy fuel injection method, device, equipment and automobile |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004100566A (en) * | 2002-09-09 | 2004-04-02 | Toyota Motor Corp | Fuel injection control device of internal combustion engine |
| EP1088979B1 (en) * | 1999-09-30 | 2005-03-16 | Mazda Motor Corporation | A control system for a direct injection engine of spark ignition type |
| CN1730926A (en) * | 2005-08-18 | 2006-02-08 | 河北工业大学 | Multipoint sequential injection control system of gas fuel |
| CN102588134A (en) * | 2012-03-08 | 2012-07-18 | 潍柴动力股份有限公司 | Diesel engine injection control method and electric control diesel engine utilizing same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7415348B1 (en) * | 2007-02-20 | 2008-08-19 | Gm Global Technology Operations, Inc. | Multiple injection blend for direct injected engines |
-
2014
- 2014-12-05 CN CN201410742566.1A patent/CN104500247B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1088979B1 (en) * | 1999-09-30 | 2005-03-16 | Mazda Motor Corporation | A control system for a direct injection engine of spark ignition type |
| JP2004100566A (en) * | 2002-09-09 | 2004-04-02 | Toyota Motor Corp | Fuel injection control device of internal combustion engine |
| CN1730926A (en) * | 2005-08-18 | 2006-02-08 | 河北工业大学 | Multipoint sequential injection control system of gas fuel |
| CN102588134A (en) * | 2012-03-08 | 2012-07-18 | 潍柴动力股份有限公司 | Diesel engine injection control method and electric control diesel engine utilizing same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104500247A (en) | 2015-04-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104500247B (en) | Combustion control method for all-condition plane of direct-injection compression-ignition engine | |
| CN101832176B (en) | Engine | |
| CN112761780B (en) | Lean combustion system and method and engine | |
| CN101907025A (en) | Multi-fuel combustion system of internal combustion machine | |
| CN104454190B (en) | Intra-cylinder direct injection double gas fuel ignition type combustion and control device | |
| CN102619636B (en) | A kind of petrol engine energy-saving and emission-reduction combustion method | |
| CN111379634B (en) | Lean-burn engine and automobile | |
| CN109209656A (en) | 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 | |
| CN104265471A (en) | Combustion mode control system of gasoline premixing and diesel igniting engine and control policy thereof | |
| CN105041512B (en) | A kind of dual fuel engine lean burn method | |
| CN102182608A (en) | Combustion system of gasoline direct injection engine and control method thereof | |
| CN104989539A (en) | Internal combustion engine for direct injection of double-gas fuel in cylinder under EGR condition and control method | |
| CN106321270A (en) | Control method of coupling fuel injection timing strategy based on heavy-duty diesel engine variable valve timing technology | |
| CN104612869B (en) | A kind of method that dual fuel injection suppresses supercharging gasoline engine super detonation | |
| CN110145405A (en) | The double injected petrol lean-combustion engines of perforated plate type atomizer | |
| CN107747517A (en) | It is a kind of to be used to suppress double direct-injection systems in the cylinder of pinking | |
| CN204299708U (en) | The two gaseous fuel Spark ignition type burning of a kind of in-cylinder direct injection and control gear | |
| CN103216316B (en) | Low-temperature combustion method of internal-combustion engine with fuel reformation inside cylinders and system | |
| CN101929364B (en) | Diffusion combustion method for knock-resisting compression ignition of equivalence-ratio gasoline direct injection engine | |
| CN102322360B (en) | In-cylinder direction injection gasoline engine and control method thereof | |
| CN208763748U (en) | A kind of gasoline direct engine with supercharger of high thermal efficiency low emission | |
| CN106762101A (en) | A kind of directly jetting gasoline engine combustion system and control method | |
| CN106321289A (en) | Single-point injection gas engine stratified combustion system | |
| CN104963778A (en) | Waste gas dilution dual fuel engine equivalent ratio burning system and method | |
| CN102213134B (en) | Based on the implementation method of engine controlled exhaust backpressure valve CAI burning |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |