CN105986915A - Direct injection supercharged gasoline engine super-knock control method - Google Patents
Direct injection supercharged gasoline engine super-knock control method Download PDFInfo
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- CN105986915A CN105986915A CN201510041093.7A CN201510041093A CN105986915A CN 105986915 A CN105986915 A CN 105986915A CN 201510041093 A CN201510041093 A CN 201510041093A CN 105986915 A CN105986915 A CN 105986915A
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- control method
- super detonation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
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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
- F02D41/22—Safety or indicating devices for abnormal conditions
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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
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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
- Y02T10/40—Engine management systems
Abstract
The invention provides a direct injection supercharged gasoline engine super-knock control method which can effectively control super-knock. The control method includes: recognizing an air cylinder which has super-knock caused by advanced ignition of mixed gas due to spontaneous combustion of lubricating oil entering the air cylinder, and identifying the air cylinder as a super-knock air cylinder; delaying the last oil injection of the super-knock air cylinder to a compression stroke, and controlling the time of the last oil injection to allow a crank angle to be not earlier than a crank angle corresponding to advanced ignition while the mixed gas for combustion is formed. The control method is simple, can only control the oil injection time of an individual super-knock cylinder, and is high in operation reliability; and the number of the recognized super-knock air cylinders may be one or more than one. The experiment proves that the control method can effectively control super-knock.
Description
Technical field
The present invention relates to direct-injection gasoline supercharging engine combustion control technology field, particularly relate to
A kind of control method of direct-injection supercharging gasoline engine super detonation.
Background technology
Direct-injection supercharging technology is a kind of effective ways of gasoline engine miniaturization, energy-saving and emission-reduction, due to
Uniformly burning and the discharge of metering gaseous mixture is easier to control than Weak mixture stratified combustion,
The direct-injection supercharging gasoline engine using homogenizing metering combustion is increasingly becoming small-sized supercharging gasoline engine market
Main flow.
For the electromotor of the above-mentioned type, can run into a kind of by entering when low speed high pressure-charging operating mode
The severe knock phenomenon that the gaseous mixture advanced ignition that the lubricating oil spontaneous combustion of cylinder causes causes.Due to
The order of magnitude of cylinder-firing pressure when pressure oscillation during pinking can reach normal combustion, this not
Normal combustion is referred to as super detonation.
In practice, super detonation occurs mainly in engine speed and and puts down below 2500 turns
All the effective pressure low speed high load working condition higher than 16bar, can cause spark when it frequently occurs
Thermal ablation crossed by plug and exhaust valve, the molten top of piston, perforation or scuffing of cylinder bore, and connecting rod bending etc. starts
The inefficacy of machine parts.The high frequency pressure waves that super detonation produces can clean out and be attached to combustor
The remaining lubricating oil causing advanced ignition on wall or carbon distribution, this automatic cleaning action makes to surpass
Level pinking has randomness and non-persistence.
Because the lubricating oil spontaneous combustion of advanced ignition system is done, it is impossible to by pushing away as controlling common pinking
The mode of late spark plug duration of ignition controls super detonation, it is true that the plug ignition time
The slowest, super detonation is the strongest；Furthermore, cause advanced ignition lubricating oil source and
Ignition location is the most fully aware of, the lubricating oil being attached in combustion chamber wall surface in cylinder is completely eliminated
The most unrealistic.Therefore, there is presently no the method that super detonation is control effectively.
Therefore, the control method of a kind of direct-injection supercharging gasoline engine super detonation how is designed, in order to
Effectively control super detonation, be that those skilled in the art need badly at present and solve the technical problem that.
Summary of the invention
It is an object of the invention to provide the control method of a kind of direct-injection supercharging gasoline engine super detonation,
Can effectively control super detonation.
For solving above-mentioned technical problem, the present invention provides a kind of direct-injection supercharging gasoline engine super detonation
Control method, comprise the following steps:
1) identify because the lubricating oil spontaneous combustion entering in cylinder causes advanced ignition to produce super detonation
Cylinder, and identify as super detonation cylinder；
2) compression stroke is postponed till in the last oil spout of described super detonation cylinder, and lead to
Spend the time controlling last oil spout so that bent axle when forming the gaseous mixture being available for burning turns
Angle is no earlier than the crank angle corresponding to advanced ignition.
The control method of the present invention, is identifying certain cylinder because occurring lubricating oil spontaneous combustion to cause
Advanced ignition and when there is super detonation, carry out single oil spout as super detonation cylinder
Control, in order to effectively control super detonation.In engine operation process, the spray of each circulation
Oil can be divided into and completing several times, owing to the concentration of front the formed gaseous mixture of oil spout several times is being caught fire
Lower Limits so that ignition energy big and be not easily formed stable flame, so,
Gaseous mixture stably burns required physical condition by last Injection Control.Due to predicted point
Fire occurs in compression stroke, and if last oil spout occurs in induction stroke, by air inlet
During compression, it is more likely that form the gaseous mixture being available for burning, and in entering cylinder
Lubricating oil generation spontaneous combustion time be ignited, cause gaseous mixture advanced ignition；Based on above-mentioned principle,
Last oil spout can be postponed to compression stroke, and control specifically injection time, in order to
Make the gaseous mixture being available for burning only be formed before plug ignition, thus avoid gaseous mixture by mistake
Early light.Visible, the control method of the present invention is relatively simple, it is only necessary to indivedual super detonation gas
The injection time of cylinder is controlled, and operating reliability is higher；Identified super detonation
Cylinder can be one or more than one.Test proves, above-mentioned control method can be controlled effectively
Super detonation processed.
Alternatively, described step 1) specifically include: judge whether because entering the profit in cylinder
Lubricating oil spontaneous combustion causes advanced ignition to produce the cylinder of super detonation, if it is, identified
For super detonation cylinder, and perform described step 2), if it is not, then terminate.
Alternatively, in described step 2) after further comprising the steps of:
3) judge whether super detonation is suppressed, if it is, terminate, if it is not, then hold
Row step 4)；
4) distributive value of each oil spout of each cylinder is increased so that last oil spout is formed mixed
Close the concentration of gas corresponding to maximum flame speed, and according to described step 2) control each cylinder
The time of a rear oil spout.
Alternatively, in described step 4) after further comprising the steps of:
5) judge whether super detonation is suppressed, if it is, terminate, if it is not, then hold
Row step 6)；
6) electromotor is implemented limit to turn round, to jump out the operation of super detonation district.
Alternatively, in described step 6) in, electromotor fall is turned round raising speed, in order to it is super
Run with identical output outside pinking district.
Alternatively, in described step 6) in, electromotor fall turns round at least 500 works of fall forward
Circulate or 30 seconds, then terminate.
Alternatively, in described step 3) and described step 5) in, if super detonation is pressed down
System, then according to described step 2) or described step 4) continue executing with at least 500 cycle of operation
Or at least 30 seconds, terminate the most again.
Alternatively, in described step 2) and described step 4) in, often circulation oil spout divides at least
Carrying out for three times, the distributive value of last oil spout is 25%～33%.
Accompanying drawing explanation
Fig. 1 is that the control method of direct-injection supercharging gasoline engine super detonation provided by the present invention is in one
Schematic flow sheet in detailed description of the invention；
Fig. 2 is that the control method provided by the present invention principle in the first detailed description of the invention is shown
It is intended to；
Fig. 3 is that the control method provided by the present invention principle in the second detailed description of the invention is shown
It is intended to；
Fig. 4 is the relation of the flame speed of gasoline mixture and ignition energy and excess air coefficient
Schematic diagram；
Fig. 5 is the system structure schematic diagram of direct-injection supercharging gasoline engine.
In Fig. 1-5:
Turbocharger compressor 1, charge air cooler 2, electronic throttle 3, inlet manifold 4, high pressure are common
Rail oil supply system 5, electromotor 6, multiple orifice nozzle 7, cylinder 8, exhaust manifold 9, supercharging
Device exhaust turbine 10, engine exhaust oxygen sensor 11, ternary catalyzing unit 12
Detailed description of the invention
The core of the present invention is to provide the control method of a kind of direct-injection supercharging gasoline engine super detonation,
Can effectively control super detonation.
Below in conjunction with the drawings and specific embodiments, the control method of the present invention is carried out specifically
Bright, in order to those skilled in the art more accurately understand the present invention.
Really the most as stated in the Background Art, direct-injection gasoline supercharging engine under low speed high load working condition,
Crankcase ventilation recirculation brings the oil particles in cylinder into can be trapped in combustor when scavenging
On wall；Under the wall surface temperature and the gas temperature effect in compression later stage of combustor, it is trapped in
Oil particles in combustion chamber wall surface can be evaporated and reach ignition condition at its particle surface, produces
The raw spontaneous combustion similar with diesel particulate, the lubricating oil of spontaneous combustion causes the predicted point of gaseous mixture further
Fire.Owing to the duration of ignition is too early, and on the wall of combustor, there is other incendiary source, unburned district
Gaseous mixture can be rapidly reached ignition condition and cause much bigger super more quick-fried than conventional knock intensity
Shake.
At present, the source and the ignition location that cause the lubricating oil of advanced ignition ten are not distinguished
Chu, and the lubricating oil being attached in combustion chamber wall surface in cylinder is completely eliminated is the most unrealistic.For
Above-mentioned situation, the present invention focuses on and weakens or eliminate the condition causing pinking, produces from super detonation
Raw mechanism is started with, and suppresses super detonation.Super detonation is same as common pinking in mechanism, i.e.
Owing to the combustion mixture in unburned district occurred spontaneous combustion before the flame of the gaseous mixture being ignited arrives
Caused.The more morning that advanced ignition occurs, the region that spontaneous combustion occurs is the biggest, and pinking is the strongest
Strong.In view of super detonation is relatively big to the destructive power of electromotor, super detonation how is suppressed to become out
Send out the problem that direct-injection supercharging gasoline engine must take into.
For above-mentioned technical problem, the present invention avoids unmanageable incendiary source, i.e. avoids in cylinder
The spontaneous combustion of lubricating oil, starts with from the object being ignited, and is available for the mixing of burning by controlling formation
The time of gas, control super detonation.
As it is shown in figure 1, the control method of the present invention specifically may include steps of:
S1: gather the signal of the advanced ignition window demarcated in advance, i.e. detonation sensor monitoring is sent out
Motivation is vibrated, and the engine vibration signal detected is filtered the predicted point demarcated in advance by wave filter
Signal beyond fire window, i.e. turns because of bent axle corresponding during lubricating oil spontaneous combustion initiation advanced ignition
Engine vibration signal beyond angle range；
S2: relatively each cylinder electromotor that detonation sensor detects in advanced ignition window shakes
The difference of vibration signal when dynamic signal and the most calibrated electromotor normal combustion, it is judged that be
No existence causes advanced ignition to produce the gas of super detonation because entering the lubricating oil spontaneous combustion in cylinder
Cylinder, if it is not, then terminate, if it is, identify as super detonation cylinder, and performs
Step S3；
S3: the last injection time of super detonation cylinder is postponed to compression stroke, and controls
Make the time of last oil spout, so that being available for the gaseous mixture of burning only before plug ignition
Being formed, the crank angle of the mixed Daqu being i.e. available for burning covers advanced ignition window comprehensively,
The gaseous mixture being available for burning is avoided to be lighted by the lubricating oil in cylinder in advanced ignition window；
S4: judge whether super detonation is suppressed, if it is, terminate, if it is not, then hold
Row step S5；
S5: the last injection time of each cylinder is all postponed to compression stroke and to each gas
The time of the last oil spout of cylinder is controlled so that advanced ignition window is coated over each cylinder
Formed in the crank angle range needed for being available for the gaseous mixture of burning；Meanwhile, each cylinder is increased many
The distributive value of each oil spout in secondary oil spout so that the mixture strength that last oil spout is formed
Corresponding to maximum flame speed, to increase the ignition energy needed for advanced ignition and lag period, i.e.
Make the gaseous mixture after being ignited with the maximum inswept unburned district of flame speed, farthest reduce fire
Flame arrives the front hypergolic region of unburned mixture, by the control of mixture combustion is entered one
Step suppression super detonation；
S6: judge whether super detonation is suppressed, if it is, terminate, if it is not, then hold
Row step S7；
S7: electromotor is implemented limit and turns round, in order to it is jumped out super detonation district and runs, and according to not having
The Injection strategy in the case of super detonation is had to carry out normal Injection Control.
Further, in step S4 and step S6, if super detonation is suppressed, can be in step
Continue to run with about 500 cycle of operation under the control strategy of rapid S3 or step S5, or continue
Reforwarding row 30 seconds, effectively to prevent the generation again of super detonation, stops super detonation the most again
Control, return to the normal control mode without super detonation, terminate whole control process.As for
The time controlled can increase and decrease as required, is not limited to above-mentioned 30 seconds or 500 cycle of operation.
In like manner, after step s 7, it is also possible to increase step S8, continue in the step s 7
Limit is turned round and is run about 500 cycle of operation under control strategy or run 30 seconds, then releases limit
Turn round, return to normal control mode, terminate whole control process.It is to say, in super detonation
In the case of repressed, all can continue to run with under original strategy about 500 cycle of operation,
Or continue to run with 30 seconds, effectively to prevent the generation again of super detonation, i.e. according to step
S8 performs, and control strategy when simply continuing to run with is different.
The advanced ignition window demarcated on engine pedestal in advance it was usually directed to before step S1
Mouthful.Advanced ignition window is being carried out timing signal, can according to the detection signal of detonation sensor,
Corresponding crank angle range that advanced ignition is occurred respectively the most certain bent axle turns front and back
Advanced ignition window it is demarcated as, in order to the electromotor detected by detonation sensor after the remaining of angle
Vibration signal passes through filter filtering, only carries out the engine vibration signal in this window ranges
Monitoring, and control accordingly according to testing result.The common pinking of electromotor typically occurs
After compression top dead center, crank angle is between 10-50 degree, and this crank angle range is the most so-called
Knock window (crank angle range that i.e. common pinking is corresponding when occurring).For to common pinking
Being controlled, electromotor is typically provided with detonation sensor, in order to control unit of engine ECU
Ignition advance angle is adjusted by the crank angle according to there is pinking, is controlled pinking.
As long as knock window covers the crank angle range that pinking occurs, it is impossible to definition too greatly,
Otherwise can increase ECU and process data and the time made a response.In like manner, in view of entering in cylinder
Lubricating oil may be in certain the crank angle generation spontaneous combustion before compression top dead center and cause
Advanced ignition thus change the vibration of electromotor, therefore can by from occur advanced ignition time corresponding
Crank angle range as advanced ignition window, in order to ECU is logical in advanced ignition window
Cross detonation sensor the engine luggine change caused because of advanced ignition to be monitored, to control
The super detonation caused because of advanced ignition.The detonation sensor of identification advanced ignition can be special
Arrange can also be the conventional knock sensor controlling the plug ignition time.Use conventional quick-fried
When shake sensor controls the super detonation of common pinking and advanced ignition initiation simultaneously, it is necessary to carrying
It is demarcated by front ignition window and knock window respectively.Advanced ignition window herein leads to
Often corresponding to the crank angle range of 10-30 degree before compression top dead center, knock window is the most usual
It is located at the crank angle range of 10-50 degree after compression top dead center.
It is appreciated that in the internal memory of control unit of engine ECU, have advanced ignition window and filter
During the relevant information of ripple scope, step S1 can be saved, and directly perform step S2.Meanwhile,
In step s 2, the dependency of advanced ignition and super detonation can be given tacit consent to, now, only need
Identify the cylinder of described generation advanced ignition, identify as super detonation cylinder, the most again
Perform corresponding control strategy.
Certainly, when saving step S1, in step s3, can directly control for the last time
The time of oil spout, in order to crank angle when forming the gaseous mixture being available for burning is no earlier than predicted point
Crank angle corresponding to fire, i.e. forms flammable mixing after possible advanced ignition point
Gas, to avoid gaseous mixture by the lubricating oil premature ignition of spontaneous combustion.Advanced ignition institute described herein
Corresponding crank angle is different when occurring every time, but advanced ignition angle at the latest and the earliest
Generally should fall into above-mentioned advanced ignition window coverage；Because ECU must be according to thing in internal memory
Knock sensor signal is compared to judge electromotor by the relevant information first demarcated and store
Burn the most normal.
In step s3, when postponing last injection time to compression stroke, last
The cooling effect of secondary oil spout and formation are available for the gaseous mixture of burning uniformly and require time for compression
Top dead-centre is close, has slackened gaseous mixture by the condition of lubricating oil premature ignition in cylinder；By compression
The Oil injection cooling of process and control the gaseous mixture formation time in the compression process later stage so that in advance
Igniting time as far as possible near compression top dead center, to reduce the advanced ignition damage to electromotor
Wound, it might even be possible to make lubricating oil complete plug ignition when still can not light gaseous mixture, it is achieved just
Often burning, thus avoid super detonation.Even if gaseous mixture is lighted by lubricating oil in advance, by
Significantly postponed in advanced ignition point, proved through lot of experiments, the advanced ignition now occurred
Only can improve cylinder pressure in a limited degree, super detonation will not be caused.
It is further appreciated that step S4-S8 all can be omitted, and uses the method in step S3
Control electromotor to work several cycle of operation, as caused the lubricating oil of advanced ignition super in cylinder
Level pinking is removed by major part when occurring, the most also can realize the effective control to pinking.When
So, in the case of super detonation is more strong, increases step S4 and judge, and according to
Judged result changes corresponding control strategy, performs to increase the control of oil spout concentration according to step S5
System strategy, it is possible to increase the reliability of knock control, in order to fast and effeciently control super detonation
Generation again, reduce damage to electromotor.In like manner, can also increase after step s 5
Add step S6 to judge, and when using increase oil spout concentration and postponing last oil spout
Between when all effectively can not control pinking, carry out limit according to step S7 and turn round and control, can be to vehicle
The mode of driving impact minimum jumps out pinking district so that it is return to properly functioning control model,
To reducing vehicle operator's sensitivity to electromotor super detonation control strategy.
Specifically, in the step s 7, implement electromotor to carry out raising speed while limit is turned round,
So that electromotor runs under equal-wattage, say, that super detonation jumped out by electromotor
District, runs with identical output, it is ensured that vehicle is properly functioning.Due in low speed high load
During operation, when low speed torque drops to a certain degree, electromotor will no longer be required to be come by scavenging
The flow of raising turbocharger compressor, to reach the supercharging requirement needed for low speed torque, also would not
The lubricating oil making crankcase ventilation recirculation bring in cylinder accompanies the air intake duct short circuit to exhaust duct
The scavenging of cylinder is flowed and is trapped in combustion chamber wall surface and is formed possible pre-ignition source, from
The aspect such as incendiary source and burning condition limits the burning in cylinder, thus jumps out super detonation district
Run.Meanwhile, fall is turned round issuable power drop and can be compensated by improving rotating speed,
The method making electromotor turn round raising speed along equipower line by fall eventually (is i.e. jumped out outside predicted point flame range
Super detonation district) run.The method in super detonation district is jumped out to shift of transmission along equipower line
Strategy impact minimum, thus this fall is turned round strategy and the driving of car load is affected minimum.Please be further
In conjunction with Fig. 2-4, the principle of control method of the present invention is described in further detail.
In practice, engine fuel system the most often circulates for once to the oil spout of cylinder, and
Complete in the intake stroke.But there is the engine speed district of super detonation, i.e. less than 2500
When turning, the time corresponding due to induction stroke is long, can shorten one by improving injection pressure
The time of secondary continuous oil spout, make oil spout divide and carry out several times.As herein described some be exponential quantity
Uncertain multiple, usually three or more than three.Say as a example by three oil spouts herein
Bright.Gaseous mixture as herein described, in the case of without specified otherwise, refers both to be available for the mixing of burning
Gas, the most uniformly mixing.
As in figure 2 it is shown, when without super detonation, three oil spouts all can complete in induction stroke,
Each oil spout account for the ratio of total fuel injection quantity can control respectively 35%, 32%～40%,
25%～33%；In cylinder the excess air coefficient of gaseous mixture along with three oil spouts change be respectively
2.86,1.33～1.5,1.0.Wherein, to first time oil spout quantitative limitation mainly in view of living
Plug leaves air inlet top dead-centre soon, and oil bundle penetration length can not be too big, otherwise can produce with piston
Interfere.Due to the difference of turbulence intensity in different engine piston shapes and cylinder, suitably
The distributive value of injection time and second time oil spout finally can be determined by experiment.When second time
When distributive value is set as 32%, corresponding excess air coefficient is 1.5, and it catches fire for gaseous mixture
Lower Limits, thus stable flame can not be formed.It is to say, only complete third time
After oil spout, the excess air coefficient of correspondence can be made to reach 1.0, form the meter being available for burning
Amount gaseous mixture, therefore, the present invention controls the shape of gaseous mixture by controlling the time of third time oil spout
The one-tenth time, and then control super detonation.
In order to improve mixing quality, when engine fuel system condition is permitted, should increase as far as possible
Distributive value for the second time, such as can be brought up to 40%, and corresponding excess air coefficient is
1.33, third time oil spout can be made to reduce to 25%, be conducive to evaporation and the mixing of third time oil spout,
To form more uniform gaseous mixture.
Engine electric-controlled unit ECU can be according to each cylinder knocking sensor signal received
Analyze the advanced ignition window intrinsic motivation vibration each cylinder is corresponding whether normal, and by than
Vibration signal during the electromotor normal combustion stored in the internal memory of relatively ECU determines whether to occur
Advanced ignition.
When ECU identifies advanced ignition in the advanced ignition window of a certain cylinder, by this gas
Cylinder is labeled as occurring the cylinder of super detonation, and postpones the third time oil spout of this cylinder to compression
Stroke, and control the time of third time oil spout so that the crank angle energy of metering mixed Daqu
Enough covering advanced ignition window, the crank angle needed for i.e. forming gaseous mixture is no earlier than advanced ignition
Window；As in figure 2 it is shown, from a period of time L1 of third time fuel injection beginning to compression top dead center
Being the evaporation incorporation time of third time oil spout, it is completely covered advanced ignition window.
Owing to third time oil spout to the cooling effect of gaseous mixture in cylinder and is available for the most mixed of burning
The formation crank angle closing gas shifts to compression top dead center, causes gaseous mixture to be lighted by lubricating oil in cylinder
Time corresponding advance position after move and the ignition lag phase extend so that spark plug is at lubricating oil
Complete igniting before causing gaseous mixture advanced ignition, i.e. realize normal ignition, thus suppress super
Pinking.
If can not effectively suppress super after implementing the strategy postponing third time oil spout shown in Fig. 2
Level pinking, can carry out enriching to gaseous mixture so that the excess that the gaseous mixture that formed is corresponding is empty
Needed for gas coefficient is the excess air coefficient under maximum flame speed, and then gaseous mixture is lighted in raising
Ignition energy, increase advanced ignition difficulty.
As shown in Figure 4, the ignition energy of metering gaseous mixture is minimum, i.e. when excess air coefficient etc.
In 1 time, gaseous mixture is easiest to be ignited, when mixture strength increases, it is desirable to ignition energy
Amount increases, and meanwhile, the flame speed formed improves.In the diagram, represent that excess is empty with λ
Gas coefficient, the curve represented with the solid line change as flame speed, the curve being represented by dotted lines is
The change of ignition energy.Visible, reach the maximum of flame speed time about λ=0.78,
Now, if continuing enriching, flame speed will decline, and arrive mixing time about λ=0.61
Gas catches fire the Lower Limits of concentration, can not form stable flame when this concentration.Gaseous mixture requirement
Ignition energy the biggest, its energy discharged by lubricating oil spontaneous combustion may be not enough to light mixing
Gas, therefore the probability of generation advanced ignition is the least；Meanwhile, even if there is advanced ignition, promote
Make flame propagate with maximal rate, make gaseous mixture as far as possible by flame ignition rather than spontaneous combustion, because of
And super detonation can not be caused.Above-mentioned principle can apply in the present invention add gaseous mixture
In dense control strategy.
In detail, if as it is shown on figure 3, the control strategy shown in Fig. 2 can not effectively suppress to carry
The super detonation that front igniting causes, can implement enriching to gaseous mixture so that form gaseous mixture
Excess air coefficient, corresponding to maximum flame speed, i.e. may be at λ=0.78 shown in Fig. 4
Position.
The distributive value increased can be averagely allocated to three oil spouts, dense due to engine mixed gas
Spend and controlled according to the oxygen sensor signal before being arranged on ternary catalyzing unit by ECU, therefore enriching needs
Each cylinder implemented simultaneously, i.e. to identify that a certain cylinder is super detonation cylinder and figure as ECU
When control strategy shown in 2 is not enough to eliminate super detonation, third time oil spout all quilts of each cylinder
Postpone to compression stroke, simultaneously enforcement enriching strategy, and control the injection time of each cylinder, make
The crank angle that must form gaseous mixture covers advanced ignition window.
As it is shown on figure 3, each oil spout account for the ratio of total fuel injection quantity could be arranged to 35% respectively,
40%, 25%, in cylinder, the air excess factor of gaseous mixture is respectively with the change of three oil spouts
2.23、1.04、0.78.After second time oil spout completes, gaseous mixture corresponding during λ=1.04
Temperature far below the burning-point of gaseous mixture, be not enough to be lighted by any incendiary source, also would not be by
Lubricating oil is lighted.Simultaneously as distributive value improves, compared with the Injection strategy shown in Fig. 2,
Can suitably shift to an earlier date third time oil spout time, with ensure third time oil spout have enough evaporations and
Incorporation time, forms the most flammable rich mixture.As it is shown on figure 3, from third time oil spout
When starting the evaporation mixing that all may be constructed third time oil spout to the time L2 of compression top dead center
Between, its time is longer, completely covers advanced ignition window.
The control strategy using above-mentioned enriching control strategy and postpone third time injection time is mutual
In conjunction with, on the one hand, oil spout for the third time occurs in compression stroke, the fuel vaporization of oil spout for the third time
The required latent heat of vaporization can absorb substantial amounts of heat energy from gaseous mixture, the mixing compressed with reduction
The temperature of gas, plays the cooling effect to gaseous mixture, improves what gaseous mixture was lighted by lubricating oil
Difficulty；On the other hand, oil spout for the third time also cools while cooling gaseous mixture and is attached to combustion
Burn the oil particles on locular wall face so that its temperature reduces, and slackens its condition reaching spontaneous combustion,
Incendiary source the most no longer can be become when the temperature on oil particles surface is less than ignition point；Furthermore,
The increase of distributive value decreases the oxygen concentration in cylinder, causes the ignition lag phase of gaseous mixture because lacking
Oxygen and extend, even if advanced ignition occur, advanced ignition impact region the least, then mix
The burning of gas is still mainly controlled by plug ignition, super detonation thus suppressed.
Even if enriching control strategy can not be completely eliminated advanced ignition, it is also possible to farthest
Weaken knock intensity, the malcombustion that reduction advanced ignition the causes destruction to electromotor.
Further, when above-mentioned control strategy all can not suppress super detonation, start for protection
Machine, electromotor can be implemented limit according to the mode minimum on driven vehicle impact and turn round by ECU,
To jump out the operation of pinking district.To being furnished with the vehicle of automatic catch change speed gear box, ECU can control to send out
Motivation is turned round along equipower line fall；For being furnished with the vehicle of manual gear change speed gear box, ECU can control
Electromotor leaves super detonation district in the way of the least on cornering ability impact and runs.In view of
The control measure of super detonation are usually by the randomness of super detonation generation and non-persistence
Finite-time control.
It should be noted that in principle, it is possible to do not increase new equipment and pass through to increase in ECU
Add new control strategy and implement above-mentioned control method, but electromotor must be carried out necessity before implementing
Demarcation, and the ECU of electromotor and oil supply system must have point cylinder and control and a repeatedly oil spout
Condition, referring specifically to described above.But, above-mentioned condition is not arbitrary electromotor
Control system and injection system all disclosure satisfy that, at present, the electromotor in Europe, Europe 5/ 6 is
There is the implementation condition of above-mentioned control strategy.Therefore, for this type of electromotor, and it is not required to increase
New device.But, to not having the electromotor of above-mentioned control strategy implementation condition, ECU
And oil supply system must extend and be only possible to have the condition that can implement proposed control strategy, no
Then, repeatedly oil spout and a point cylinder Injection Control all cannot realize.
The present invention only illustrates as a example by one of which electromotor, please further combined with Fig. 5.
As it is shown in figure 5, in direct-injection supercharging gasoline engine, air via turbocharger compressor 1, in cold
Enter the inlet manifold 4 of electromotor 6 after device 2, electronic throttle 3, and distribute to each cylinder
8.According to electromotor 6 Injection strategy, fuel oil passes through high-pressure common rail oil supply system 5 and porous oil spout
Device 7 presses firing order successively to each cylinder oil spout.Burning waste gas discharges cylinder 8 through exhaust manifold 9,
Flow to the supercharger turbine machine 10 in downstream, and driven by this supercharger turbine machine 10
Dynamic engine exhaust oxygen sensor 11, then row arrives external rings after ternary catalyzing unit 12 purifies
In border.Wherein, the engine exhaust oxygen sensor 11 before ternary catalyzing unit 12 is according to aerofluxus
Oxygen concentration adjusts the distributive value of fuel injector, starts so that ternary catalyzing unit 12 more effectively processes
The pollutant of machine 6 discharge.
Wherein, control method is referred to explanation execution above in detail, and here is omitted.
Above the control method of direct-injection supercharging gasoline engine super detonation provided by the present invention is entered
Go and be discussed in detail.Principle and the embodiment of the present invention are entered by specific case used herein
Having gone elaboration, the explanation of above example is only intended to help to understand the core concept of the present invention.
It should be pointed out that, for those skilled in the art, former without departing from the present invention
On the premise of reason, it is also possible to the present invention is carried out some improvement and modification, these improve and modify
Also fall in the protection domain of the claims in the present invention.
Claims (8)
1. the control method of a direct-injection supercharging gasoline engine super detonation, it is characterised in that bag
Include following steps:
1) identify because the lubricating oil spontaneous combustion entering in cylinder causes advanced ignition to produce super detonation
Cylinder, and identify as super detonation cylinder；
2) compression stroke is postponed till in the last oil spout of described super detonation cylinder, and lead to
Spend the time controlling last oil spout so that bent axle when forming the gaseous mixture being available for burning turns
Angle is no earlier than the crank angle corresponding to advanced ignition.
2. control method as claimed in claim 1, it is characterised in that described step 1) tool
Body includes: judge whether because the lubricating oil spontaneous combustion entering in cylinder causes advanced ignition to produce
The cylinder of super detonation, if it is, identify as super detonation cylinder, and performs described
Step 2), if it is not, then terminate.
3. the control method as described in any one of claim 1-2, it is characterised in that described
Step 2) the most further comprising the steps of:
3) judge whether super detonation is suppressed, if it is, terminate, if it is not, then hold
Row step 4)；
4) distributive value of each oil spout of each cylinder is increased so that last oil spout is formed mixed
Close the concentration of gas corresponding to maximum flame speed, and according to described step 2) control each cylinder
The time of a rear oil spout.
4. control method as claimed in claim 3, it is characterised in that in described step 4)
The most further comprising the steps of:
5) judge whether super detonation is suppressed, if it is, terminate, if it is not, then hold
Row step 6)；
6) electromotor is implemented limit to turn round, to jump out the operation of super detonation district.
5. control method as claimed in claim 4, it is characterised in that in described step 6)
In, electromotor fall is turned round raising speed, in order to it is transported with identical output outside super detonation district
OK.
6. control method as claimed in claim 5, it is characterised in that in described step 6)
In, electromotor fall torsion at least 500 cycle of operation of fall forward or 30 seconds, then terminate.
7. control method as claimed in claim 4, it is characterised in that in described step 3)
Or described step 5) in, if super detonation is suppressed, then according to described step 2) or described
Step 4) continue executing with at least 500 cycle of operation or at least 30 seconds, terminate the most again.
8. control method as claimed in claim 3, it is characterised in that in described step 2)
With described step 4) in, often circulation oil spout divides at least three times and carries out, the spray of last oil spout
Oil mass is 25%～33%.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510041093.7A CN105986915B (en) | 2015-01-27 | 2015-01-27 | A kind of control method of direct-injection supercharging gasoline engine super detonation |
| PCT/CN2015/099343 WO2016119554A1 (en) | 2015-01-27 | 2015-12-29 | Method for controlling super-knocks of direct-injection supercharged gasoline engine |
| CONC2017/0007319A CO2017007319A2 (en) | 2015-01-27 | 2017-07-24 | Method for controlling supercharged direct injection gasoline engine super knock |
| CL2017001888A CL2017001888A1 (en) | 2015-01-27 | 2017-07-24 | Method for controlling direct injection supercharged gasoline engine superdetonations |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510041093.7A CN105986915B (en) | 2015-01-27 | 2015-01-27 | A kind of control method of direct-injection supercharging gasoline engine super detonation |
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| Publication Number | Publication Date |
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| CN105986915A true CN105986915A (en) | 2016-10-05 |
| CN105986915B CN105986915B (en) | 2019-01-29 |
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| Country | Link |
|---|---|
| CN (1) | CN105986915B (en) |
| CL (1) | CL2017001888A1 (en) |
| CO (1) | CO2017007319A2 (en) |
| WO (1) | WO2016119554A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106640396A (en) * | 2016-12-16 | 2017-05-10 | 天津大学 | Super knock restraining method based on multi-parameter adjustment and control |
| CN108150299A (en) * | 2017-12-23 | 2018-06-12 | 奇瑞汽车股份有限公司 | A kind of supercharging gasoline engine super detonation pre-control method and system |
| CN114320595A (en) * | 2021-11-30 | 2022-04-12 | 江铃汽车股份有限公司 | Control method for avoiding gasoline engine running in knocking area |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7287075B2 (en) * | 2019-04-10 | 2023-06-06 | マツダ株式会社 | engine controller |
| CN112446109B (en) * | 2020-11-04 | 2022-10-28 | 潍柴动力股份有限公司 | Calibration method and device for fuel injection pressure of engine |
| CN114320705B (en) * | 2021-12-27 | 2023-11-28 | 联合汽车电子有限公司 | Fault response method and system for ignition system of passive precombustion chamber double-ignition gasoline engine |
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- 2015-12-29 WO PCT/CN2015/099343 patent/WO2016119554A1/en active Application Filing
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| CN103334846A (en) * | 2013-07-23 | 2013-10-02 | 清华大学 | Method for judging and controlling super detonation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106640396A (en) * | 2016-12-16 | 2017-05-10 | 天津大学 | Super knock restraining method based on multi-parameter adjustment and control |
| CN108150299A (en) * | 2017-12-23 | 2018-06-12 | 奇瑞汽车股份有限公司 | A kind of supercharging gasoline engine super detonation pre-control method and system |
| CN114320595A (en) * | 2021-11-30 | 2022-04-12 | 江铃汽车股份有限公司 | Control method for avoiding gasoline engine running in knocking area |
Also Published As
| Publication number | Publication date |
|---|---|
| CO2017007319A2 (en) | 2017-09-29 |
| WO2016119554A1 (en) | 2016-08-04 |
| CN105986915B (en) | 2019-01-29 |
| CL2017001888A1 (en) | 2018-04-20 |
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