CN110080887A - A kind of compound combustion control method of engine - Google Patents
A kind of compound combustion control method of engine Download PDFInfo
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- CN110080887A CN110080887A CN201910310204.8A CN201910310204A CN110080887A CN 110080887 A CN110080887 A CN 110080887A CN 201910310204 A CN201910310204 A CN 201910310204A CN 110080887 A CN110080887 A CN 110080887A
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- engine
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 21
- 150000001875 compounds Chemical class 0.000 title claims abstract description 9
- 239000000446 fuel Substances 0.000 claims abstract description 26
- 239000000203 mixture Substances 0.000 claims abstract description 20
- 239000007921 spray Substances 0.000 claims abstract description 9
- 238000010790 dilution Methods 0.000 claims abstract description 6
- 239000012895 dilution Substances 0.000 claims abstract description 6
- 238000009792 diffusion process Methods 0.000 claims abstract description 5
- 238000002347 injection Methods 0.000 claims description 27
- 239000007924 injection Substances 0.000 claims description 27
- 239000000295 fuel oil Substances 0.000 claims description 17
- 238000007906 compression Methods 0.000 claims description 11
- 230000006835 compression Effects 0.000 claims description 10
- 239000003921 oil Substances 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 2
- 230000002269 spontaneous effect Effects 0.000 claims description 2
- 239000002131 composite material Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 3
- 239000008246 gaseous mixture Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000001535 kindling effect Effects 0.000 description 2
- 230000001902 propagating effect Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 241000243251 Hydra Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- QRXWMOHMRWLFEY-UHFFFAOYSA-N isoniazide Chemical compound NNC(=O)C1=CC=NC=C1 QRXWMOHMRWLFEY-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000036413 temperature sense Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0203—Variable control of intake and exhaust valves
- F02D13/0207—Variable control of intake and exhaust valves changing valve lift or valve lift and timing
-
- 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
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
-
- 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
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
- F02D41/405—Multiple injections with post injections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
- F02P5/15—Digital data processing
- F02P5/1502—Digital data processing using one central computing unit
-
- 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
- F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Signal Processing (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The present invention discloses a kind of compound combustion control method of engine, composite fuel spray regime is used in cylinder, in-cylinder direct-jet is carried out when big load, oil spout forms fuel concentration gradient in the different stages, is forming flame using spark ignitor stratified mixtures, the energy of release makes remaining mixed Daqu multiple spot involuntary ignition, finally primary oil is sprayed again in expansion stroke, using the characteristic of diffusion combustion, heat liberation rate, heat release rate is controlled, inhibits combustion knock.The present invention can improve the problem of Combustion System hardly possible under big load, extension dilution engine operation condition range, to improve the economy and stability of burning.
Description
Technical field
The present invention relates to engine combustion process control fields, more particularly to a kind of compound combustion controlling party of engine
Method.
Background technique
Highly diluted low-temperature burning is formed since it has while improving the potentiality of fuel economy and engine exhaust emission
For a kind of new engine combustion technology of great development prospect.In the developing history of highly diluted low-temperature burning, since application is flat
The difference of platform and control strategy is also referred to as premixed charge pressuring combustion ignition technology, controllable spontaneous combustion technology and partly-premixed
Compression ignition technology etc..One of the common feature of highly diluted low-temperature burning technology is exactly useless by high temperature remnants in extra heat source or cylinder
The compression process of the heating of gas and engine itself makes dilution or thin air fuel mixture near combustion top dead center
Involuntary ignition.
Highly diluted low-temperature burning technology needs to solve the control problem of combustion process in practical applications.Gasoline compression ignition combustion
Process is controlled by Chemical Kinetics, and when state meets kindling demand only in cylinder, gaseous mixture can involuntary ignition.It is existing
Stage, the compression ignition of gasoline engine lack the means of directly controlling and accurately control ignition timing.Gasoline compression ignition is very quick for environment temperature
Sense, when engine is in cold state or Smaller load, compression ignition is difficult the normal combustion under this operating condition.Engine operation compared with
When high load capacity operating condition, burning is diluted due to lacking charge in enough cylinders, too fast exotherm rate can cause engine
Phenomenon of detonation, and excessively high in-cylinder pressure rate of rise will lead to engine mechanical load and thermic load it is excessive so that causing
The damage of engine, while can also cause the strong noise and high NOx emission of engine, this is unfavorable in the steady in a long-term of engine
Operation, can damage the service life of engine.The range of operation of highly diluted low-temperature burning is greatly limited.
Summary of the invention
The purpose of the invention is to overcome the problems, such as the kindling and Combustion Process Control of premix dilute gas mixture, and meet
Expand the demand of combustion range.A kind of compound combustion control method of engine is provided.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of compound combustion control method of engine, to realize the Combustion Process Control of gasoline engine, including following step
It is rapid:
(1) with combustion top dead center for 0 DEG C of A, inlet and exhaust valve phase and liter are adjusted by engine combustion information and state parameter
Journey, when engine is in suction stroke, pass through in cylinder direct injection device spray fuel oil, wherein time for spraying be -360~-
160 DEG C of A, injection fuel ratio are 0.6-0.8, and premix dilution homogeneous air fuel oil mixture is formed in cylinder；
(2) when engine is in compression travel latter stage, fuel oil is sprayed by direct injection device in cylinder, wherein when injection
Carving is -160~0 DEG C of A, and injection fuel ratio is 0.1-0.3, and local space forms the air oil of concentration gradient distribution in cylinder
Mixture；The air-fuel ratio near spark plug is set to level off to 1；
(3) flame is formed using the local air fuel oil mixture formed in spark ignitor step (2)；Utilize the flame
The energy for propagating release causes the diluted homogeneous air fuel oil mixture of premix in cylinder to form stable conflagration or multiple spot certainly
Combustion burning；
(4) it when engine is in expansion process initial stage, is sprayed by direct injection device in cylinder, wherein when injection
Carving is 0-180 DEG C of A, sprays Fuel Remained, forms diffusion combustion in cylinder.
Further, the distributive value of the fuel injector, oil injection time, oil spout number and time of ignition regulation are by fuel injector control
Molding block executes.
Further, the engine combustion information and state parameter, the number acquired by combustion information collection analysis module
According to being generated after comparing, calculate with engine combustion information and state parameter.
Further, the regulation of the inlet and exhaust valve phase and lift is executed by valve mechanism control module；Wherein, valve
The variation of lift and phase is continuously adjustable.
Compared with prior art, the beneficial effects brought by the technical solution of the present invention are as follows:
Evening spray technique when this method utilizes expansion stroke, optimizes for engine high load working condition, can expand high dilute
Release the range of operation of burning, hence it is evident that inhibit combustion knock situation under big load, apply in existing Ricardo Hydra 140
On type single-cylinder engine, the cyclical variations of dilute combustion can be reduced to 5% hereinafter, with equal under the action of control method of the present invention
The dilute combustion mode of matter injection, which is compared, can be obviously improved fuel economy.
Detailed description of the invention
Fig. 1 is that in the present invention while having the single-cylinder engine system construction drawing of intake port injection and in-cylinder direct-jet ability；
Fig. 2 is the system construction drawing for carrying out direct-injection fuel injector evolution on engine shown in Fig. 1 and being formed；
Fig. 3 is that the system construction drawing after external exhaust gas recirculation system is installed in engine system shown in Fig. 1；
Fig. 4 is that the system construction drawing after external exhaust gas recirculation system is installed in engine system shown in Fig. 2；
Appended drawing reference: 1, swept volume in cylinder；2, piston；3, connecting rod；4, exhaust valve；5, inlet valve；6, port-Fuel-Injected
Device；7, fuel injector；8, spark plug；9, turbine；10, compressor；11, intercooler；12, high-pressure EGR loop；13, low pressure EGR returns
Road；14, high-pressure EGR loop EGR control valve；15, low-pressure EGR loop EGR control valve.
Specific embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.It should be appreciated that described herein
Specific embodiment be only used to explain the present invention, be not intended to limit the present invention.
Shown in FIG. 1 is the system construction drawing of the reciprocating two-stroke of a single cylinder or four-stroke engine.Piston 2 passes through
Connecting rod 3 is connected with crankshaft, realizes that swept volume 1 changes in cylinder by its reciprocating motion.Engine chamber is at least equipped with one
A inlet valve 5 and an exhaust valve 4.The port injector 6 being mounted in air intake duct is used under idling and small load condition
It carries out port fuel injection and forms homogeneous charge.Being mounted on the fuel injector 7 that engine cylinder covers is that piezo-electric crystal is outward opening
Gasoline ejector, needle-valve, which rises and takes a seat, to be responded fastly, can realize multiple oil spout in a working cycles.One spark plug
8 are installed in cylinder head for lighting homogeneous charge in cylinder.
Fig. 2 illustrates an engine identical with Fig. 1, but the oil spout of engine cylinder inner direct shown in Fig. 2
Device engine more shown in FIG. 1 is in the position far from spark plug.It is available in order to be formed about in spark plug in the application of this example
Stratified mixtures, need to design special combustion chamber on piston and cooperated.Its design method guides vapour by existing wall surface
Combustion chamber design in oily direct fuel-injection engine.
Fig. 3 and Fig. 4 shows respectively in engine system identical with Fig. 1 and Fig. 2, has extraly installed turbine increasing additional
Depressor.Turbocharger is made of the turbine 9 being connected in exhaust duct and the compressor 10 being connected in air intake duct.Cooling
External exhaust gas recirculation circuit (high-pressure EGR loop 12 and/or low-pressure EGR loop 13).In the downstream of compressor 10 adds
Cooler 11, to reduce pressurized charge temperature.Portion is exported from the upstream of turbine 9, by a heat exchanger
The downstream for being cooled back to compressor 10 in gas handling system.Its amount of exhaust is by high-pressure EGR loop EGR control valve 14 or low
EGR circuit EGR control valve 15 is pressed to adjust.The egr system that this extraction pressure is significantly greater than environmental pressure in this example will
Referred to as high pressure EGR.In addition, external exhaust gas can also be drawn from the downstream of turbine 9 returns to compressor 10 in gas handling system
Upstream.At this point, the extraction pressure of external exhaust gas and environmental pressure are close, this external exhaust gas recirculation circuit in this example will
Referred to as low pressure EGR.ECU is low according to engine speed, load (throttle opening), temperature, charge flow rate, delivery temperature control
EGR circuit EGR control valve 15 or high-pressure EGR loop EGR control valve 14 is pressed to open in due course, exhaust gas passes sequentially through turbine 9, calms the anger
Machine 10 and intercooler 11 reach combustion chamber.
Control method proposed by the present invention mainly includes injection strategy.It is operated judging engine in high load capacity
When, the dilute gas mixture in air intake duct is on the engine equipped with egr system shown in Fig. 3, by drawing in gas handling system
Enter what the mode of external exhaust gas recirculation was realized, either passes through high-pressure EGR loop 12 or low-pressure EGR loop 13 or two kind of outside
The method of exhaust gas recirculation circuit dual-purpose.After obtaining premix dilution/Weak mixture, pass through the conjunction in compression stroke later period
It carves in due course and utilizes in-cylinder direct-jet fuel injector 7, sprayed when piston is close to compression top center, being formed around spark plug can point
The gaseous mixture close to equivalent proportion of combustion.Stratified mixtures are formed in cylinder at this time, i.e. spark plug is nearby then close to equivalent proportion
Gaseous mixture, what the other positions in combustion chamber were filled is the dilute gas mixture of premix.And then in the way of 8 arcing of spark plug,
Stratified mixtures are lighted at the reasonable moment.Fiery core is formed about in spark plug first, is then gradually diffused into other areas of surrounding
Domain.By in-cylinder pressure raising and the continuation of piston caused by the heat and the process discharged in flame propagation and development process
Pressure rise caused by compressing keeps remaining interior unburned premix of cylinder thin or dilute gas mixture involuntary ignition, at the beginning of expansion stroke
Phase sprays fuel oil by in-cylinder direct-jet fuel injector 7, forms diffusion combustion, realizes the regulating and controlling effect of heat liberation rate, heat release rate, inhibits pinking.
(1) with combustion top dead center for 0 DEG C of A, inlet and exhaust valve phase and liter are adjusted by engine combustion information and state parameter
Journey, when engine is in suction stroke, pass through in cylinder direct injection device spray fuel oil, wherein time for spraying be -360~-
160 DEG C of A, injection fuel ratio are 0.6, and premix dilution homogeneous air fuel oil mixture is formed in cylinder；
(2) when engine is in compression travel latter stage, fuel oil is sprayed by direct injection device in cylinder, wherein when injection
Carving is -160~0 DEG C of A, and injection fuel ratio is 0.3, and local space forms the air oil mixing of concentration gradient distribution in cylinder
Object；
(3) flame is formed using the local air fuel oil mixture formed in spark ignitor step (2)；Utilize the flame
The energy for propagating release causes the diluted homogeneous air fuel oil mixture of premix in cylinder to form stable conflagration or multiple spot certainly
Combustion burning；
(4) it when engine is in expansion process initial stage, is sprayed by direct injection device in cylinder, wherein when injection
Carving is 0-180 DEG C of A, sprays remaining 0.1 fuel oil, forms diffusion combustion in cylinder.
The present invention is not limited to embodiments described above.Above the description of specific embodiment is intended to describe and say
Bright technical solution of the present invention, the above mentioned embodiment is only schematical, is not restrictive.This is not being departed from
In the case of invention objective and scope of the claimed protection, those skilled in the art may be used also under the inspiration of the present invention
The specific transformation of many forms is made, within these are all belonged to the scope of protection of the present invention.
Claims (3)
1. the compound combustion control method of a kind of engine, to realize that the combustion process of the big load of gasoline engine and full load optimizes
Control, which comprises the following steps:
(1) with combustion top dead center for 0 DEG C of A, inlet and exhaust valve phase and lift are adjusted by engine combustion information and state parameter,
When engine is in suction stroke, fuel oil is sprayed by direct injection device in cylinder, wherein time for spraying is -360~-120 DEG C of A,
Injection fuel ratio is 0.5-0.8, and premix dilution homogeneous air fuel oil mixture is formed in cylinder；
(2) when engine is in compression travel latter stage, pass through in cylinder direct injection device spray fuel oil, wherein time for spraying be-
120~0 DEG C of A, injection fuel ratio are 0.1-0.3, and local space forms the air oil mixing of concentration gradient distribution in cylinder
Object makes the air-fuel ratio near spark plug level off to 1；
(3) flame is formed using the local air fuel oil mixture formed in spark ignitor step (2)；Utilize the flame propagation
The energy of release causes the diluted homogeneous air fuel oil mixture of premix in cylinder to form stable conflagration or multiple spot spontaneous combustion combustion
It burns；
(4) it when engine is in expansion process initial stage, is sprayed by direct injection device in cylinder, wherein time for spraying is
0-180 DEG C of A, sprays Fuel Remained, and fuel ratio 0.1-0.4 forms diffusion combustion in cylinder.
2. the compound combustion control method of engine according to claim 1, which is characterized in that the oil spout of the fuel injector
Amount, oil injection time, oil spout number and time of ignition regulation are executed by fuel injector control module.
3. the compound combustion control method of engine according to claim 1, which is characterized in that the engine combustion information
And state parameter, it compared, counted with engine combustion information and state parameter by the data that combustion information collection analysis module acquires
It is generated after calculation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910310204.8A CN110080887A (en) | 2019-04-17 | 2019-04-17 | A kind of compound combustion control method of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910310204.8A CN110080887A (en) | 2019-04-17 | 2019-04-17 | A kind of compound combustion control method of engine |
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| Publication Number | Publication Date |
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| CN110080887A true CN110080887A (en) | 2019-08-02 |
Family
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|---|---|---|---|
| CN201910310204.8A Pending CN110080887A (en) | 2019-04-17 | 2019-04-17 | A kind of compound combustion control method of engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112377314A (en) * | 2020-10-09 | 2021-02-19 | 东风汽车集团有限公司 | Hybrid special engine control method, device and equipment and readable storage medium |
| CN114357759A (en) * | 2021-12-31 | 2022-04-15 | 北京理工大学 | Diesel engine combustion heat release rate prediction method based on evaporation process |
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