CN105909414B - Electronic control common rail oil sprayer full working scope spray characteristic on-line correction method - Google Patents
Electronic control common rail oil sprayer full working scope spray characteristic on-line correction method Download PDFInfo
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- CN105909414B CN105909414B CN201610342883.3A CN201610342883A CN105909414B CN 105909414 B CN105909414 B CN 105909414B CN 201610342883 A CN201610342883 A CN 201610342883A CN 105909414 B CN105909414 B CN 105909414B
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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
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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
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
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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
- F02D41/3809—Common rail control systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The present invention provides a kind of electronic control common rail oil sprayer full working scope spray characteristic on-line correction method, comprising the following steps: step 1 creates the nominal spray characteristic curve of electronic control common rail oil sprayer；Electronic control common rail oil sprayer spray characteristic curve graph is divided into multiple subregions by step 2；Step 3 finds the feature spray regime point for characterizing the subregion, and construct the mathematical relationship of non-feature spray regime point and feature spray regime point in subregion other than the subregion in small oil mass region in other each sub-regions；Step 4, in common-rail injector operation, find the neighbouring feature spray regime point of work at present spray regime point, where the feature spray regime point found in subregion, utilize the mathematical relationship of non-the feature spray regime point and feature spray regime point of step 3 building, the amendment that spray characteristic is carried out to non-feature spray regime point, thus the spray characteristic curve in on-line amending corresponding sub-region.On-line correction of the present invention is automatically performed, and precision is high.
Description
Technical field
The present invention relates to internal combustion engine high pressure common-rail injector control field, especially a kind of single electronic control common rail oil sprayer spray
The method for penetrating characteristic on-line tuning.
Background technique
In the process of running, control unit of engine (ECU) is according to throttle, car speed and various rings for vehicle internal combustion engine
Border demand calculates the engine demand torque of vehicle and the torque is converted to the injection oil mass of fuel injector, fires for electric-controlled co-rail
The amount of fuel sprayed for oil system mainly nominally sprays spy by fuel injector according to common rail track fuel pressure, fuel oil temperature
Linearity curve calculates the electromagnetic excitation time, that is, fuel injector control pulsewidth for obtaining fuel injector, and the fuel injector being calculated is controlled pulsewidth
It is loaded onto drive circuit of injector control oil-fuel injector needle-valve and opens realization fuel oil injection.The fuel injector used herein nominally sprays spy
Linearity curve is by the single spray characteristic curve of important quantity fuel injector sample under certain model in each operating point (track pressure
Power, control pulsewidth determine) average value obtain, since to share nominal spray characteristic at work bent for all fuel injectors under the model
Line, the aging different degrees of in manufacture, assembly and use process of single fuel injector inevitably just bring such
Problem: there are deviations relative to nominal injection oil mass for actual ejection oil mass at work for single fuel injector, if it is this inclined to leave
Difference presence may bring the disastrous effects such as unstable vehicle operation, engine overheat or discharge variation.
In view of the above problems, disclosing two methods at present: IIC (injector is individually corrected) and MFMA (minimum fuel
It adapts to).
IIC method is completed based on fuel injector experimental bench, determines that a few fuel injector sprays work using characteristic according to vehicle
The phase of condition (such as 300bar/4mg, 700bar/15mg, 1000bar/3mg, 1600bar/40mg) and other all spray regimes
Fuel injector is recorded by way of the actual deviation of these a small number of operating conditions and by stamp measuring single fuel injector in Guan Xing
In respective microchip, other fuel injector spray regimes, the extension are expanded to by other operating condition correlations that statistics obtains
Method will not be changed in entire fuel injector lifetime.In MFMA method, become during the service life of vehicle by means of revolving speed
Change the deviation that determination minimum region actual ejection amount and nominally sprayed, and lasting adjustment.Under normal circumstances without
It is sprayed on a small quantity in cylinder in the coast stage of injection and calculates the injection by the variation model of revolving speed
Amount.Fuel injector is individually that spray characteristic curvature correction saves corrected parameter.
Multiple patents realize the partial adjustment of fuel injector spray characteristic curve, such as Chinese patent using the above method
CN102428262 is that MFMA method is utilized to obtain single fuel injector phase within the scope of the small oil mass of fuel injector by calculating the variation of revolving speed
For the promotion delay in nominal spray characteristic curve, and the delay is extended to by the way of translation whole spray characteristics songs
Line, but the patent is in overall offset using there are such a premise, that is, fuel injector spray characteristic curves with fuel injector aging
Characteristic, for different structure designs fuel injector its change in entire spray characteristic curve ranges and it is certain it is integral it is parallel partially
Characteristic is moved, therefore limits the use scope of the patented technology.Chinese patent CN102037226 is by IIC method and MFMA method
In conjunction with fuel injector use applies IIC method before, calculates the injection within the scope of small oil mass using MFMA method after use
The characteristic curve deviation and distributive value belonging to acquiring in MFMA serves as the later measurement point of IIC function, this method is compared to single
Pure improves using IIC and MFMA method, but it is special to be used as IIC Function Extension using the distributive value that MFMA is acquired
Sign point effect is limited, because the distributive value for accumulating in small oil mass regional scope is difficult and oil mass middle in spray characteristic curve or big
To construct functional relation Reliability comparotive so in other words low there are stronger correlation for oil mass area spray operating condition, this but also
The application effect of the patent is had a greatly reduced quality.Chinese patent CN101939521 is applied to gasoline using revolving speed as by MFMA technology
Machine, it is contemplated that the influence factor under active sparking mode has only widened the application range of the technology, is made using engine speed
Whether there is or not the judgment basis of injection for the amount of being characterized calculating.
It has been all made of engine speed when above-mentioned patent application MFMA as characteristic quantity and has calculated fuel injector the amount of injection to adjust
Spray characteristic curve, but have to point out that there are bigger limitation, fuel oil sprays using engine speed as characteristic quantity
The process for entering cylinder of internal combustion engine to rotation speed change is related to complicated combustion process, and combustion process is again main by air inlet and fuel oil two
Factor determines in addition to be also contemplated that the factors such as friction, instantaneous operating condition of internal combustion engine, therefore passes through internal-combustion engine rotational speed and change estimation spray
Penetrate that accuracy of measurement is not high, there are biggish inertia since its flywheel mass is larger otherwise for the bigger diesel engine of discharge capacity, on a small quantity
Fuel oil reflect even if normal combustion to very unobvious fluctuation on revolving speed.Chinese patent CN101903629 is for automatically controlled
Common rail system uses rail pressure variation to obtain fuel injector as characteristic parameter and promotes the variation postponed as offset 1, and has chosen
Nominal distributive value and estimation distributive value offset value calculation 2 in one or more spray characteristic, the adjustment of spray characteristic curve
The sum of offset 1 and offset 2 are directly chosen, patent patent compared to before has certain in terms of combining MFMA and IIC
It is promoted, but there are the two methods scope of applications to obscure, and to there are vehicles when the estimation of one or more oil mass in spray characteristic
In operational process can not on-line implement difficulty.
Summary of the invention
It is an object of the present invention to overcome the shortcomings of the prior art and provide a kind of electronic control common rail oil sprayer full working scopes
Spray characteristic on-line correction method, for making operating condition according to current motor hand in electronic control common rail oil sprayer works, in real time
Calculate relevant parameter when meeting condition fuel injection correction device spray characteristic curve with improve fuel injector accuracy of spray improve diesel engine
Working condition.The technical solution adopted by the present invention is that:
Electronic control common rail oil sprayer full working scope spray characteristic on-line correction method, includes the following steps:
Step 1 creates the nominal spray characteristic curve of electronic control common rail oil sprayer；
Electronic control common rail oil sprayer spray characteristic curve graph is divided into multiple subregions by step 2；
Step 3 is found in other each sub-regions other than the subregion in small oil mass region and characterizes the subregion
Feature spray regime point, and construct the mathematical relationship of non-feature spray regime point and feature spray regime point in subregion；It is small
Oil mass region refers to that injection control pulsewidth and rail pressure in spray characteristic curve graph are respectively less than the region of predetermined value；
Step 4 in common-rail injector operation, finds the neighbouring feature spray regime point of work at present spray regime point,
Where the feature spray regime point found in subregion, work is sprayed using the non-feature spray regime point and feature of step 3 building
The mathematical relationship of condition point carries out the amendment of spray characteristic to non-feature spray regime point, thus in on-line amending corresponding sub-region
Spray characteristic curve；
Step 5 uses the MFMA method characterized by rail pressure bent to the spray characteristic in the region in small oil mass region
Line is corrected.
Each step is described in detail below:
Step 1 creates the model under the premise of obtaining sufficient amount fuel injector sample for the fuel injector of a certain model
The nominal spray characteristic curve of fuel injector.The nominal spray characteristic curve can be based on the independent spray of each qualified fuel injector sample
Characteristic curve is penetrated to average.Wherein the control parameter of spray characteristic curve include common rail rail pressure (hereinafter referred to as rail pressure) and
Fuel injector controls pulsewidth (hereinafter referred to as control pulsewidth), and output parameter is the volume for spraying oil mass.Below electronic control common rail oil sprayer
Abbreviation fuel injector.
Electronic control common rail oil sprayer spray characteristic curve graph is divided into multiple subregions by step 2, specifically: met
The fuel injector sample of the different degree of agings of quantity regains each fuel injector sample based on fuel injector experimental bench and individually sprays
Distributive value deviation of the characteristic curve relative to nominal spray characteristic curve under the control of identical control parameter, and according to statistical method
Subregion is divided to the spray characteristic deviation of identical degree of aging.The step of dividing subregion herein is crucial, can be set according to difference
Fixed condition is for example having in small oil mass region and can divide subregion, the big oil mass region according to the inclined absolute value of the difference of injection oil mass
It is interior can according to injection oil mass deviation percentage, some extreme jeting areas (marginal zone of spray characteristic curve) can be according to spray
The percentage for penetrating the inclined absolute value of the difference of control pulsewidth or injection control pulsewidth deviation divides subregion or some has no rule
Spray regime point can divide non-compensatory zone etc. into.
Step 3 specifically includes: to fuel injector spray characteristic curve graph in addition to small oil mass region phase in each sub-regions
With the distributive value deviation data ((△ M11 ... △ M1n-1, △ M1n) of the fuel injector sample of degree of aging；(△M21……△
M2(n-1),△M2n,)；... (△ Mm1 ... △ Mm (n-1), △ Mmn)), m represents spray regime number in subregion, n generation
The fuel injector sample of important quantity in the same spray regime of table, every two groups of data mutually ask correlation statistics to calculate and obtain the son
Correlation matrix in region；Selection can meet the requirements operating condition work with all fuel oil spray regime correlations of the subregion range
Being characterized spray regime point, (feature operating condition 1, feature operating condition 2 ... feature operating condition k) are sprayed in feature spray regime point and non-feature
It penetrates and constructs mathematical relationship in operating point.Distributive value deviation data is in the actual fuel injection amount and nominal spray characteristic curve of fuel injector
The deviation that corresponding distributive value is compared.The mathematical relationship of building can singly be not limited to linear representation.It is sprayed shaped like non-feature
Distributive value deviation of the operating point under certain degree of aging are as follows: △ y=a1* △ y1+a2* △ y2+ ... an* △ yj+r*C, wherein
△ y is distributive value deviation of a certain non-feature spray regime point under the degree of aging in the subregion, and △ yj is and non-spy
The relevant feature spray regime point distributive value deviation of spray regime point is levied, wherein j is less than or equal to k, and C is constant, the mathematics of building
Expression formula form is not limited to the linear representation, and concrete form is determined in combination with the criteria for classifying of the subregion in step 2.
In conjunction with fuel injector difference degree of aging, between the feature spray regime point and non-feature spray regime point constructed in subregion
Mathematical relationship, introduce after aging coefficient r constitute non-feature spray regime point in the subregion and feature spray regime point it
Between distributive value deviation mathematical relationship.
In step 4, after subregion where searching out feature spray regime point, estimate locating for Current internal combustion engines operating condition
Each secondary actual ejection oil mass Mij of each feature spray regime point in spray characteristic curve subregion；Utilize the side of averaged
Method obtains the injection oil mass estimated value Mi of each feature spray regime point in the subregion；The injection oil of each feature spray regime point
Amount estimated value Mi and nominal spray characteristic curve compare and obtain feature spray regime point distributive value deviation；It is constructed using step 3
Non- feature spray regime point and feature spray regime point mathematical relationship, to non-ejection characteristic operating points all in subregion spray
Characteristic is penetrated to be corrected.
In step 5, the starting rail pressure and critical injection control pulsewidth of a fuel injector are obtained；Critical injection control pulsewidth refers to
Fuel injector not oil spout when less than or equal to this critical injection control pulsewidth, and sprayed if being slightly larger than this critical injection control pulsewidth
Oily device oil spout；And starting rail pressure and critical injection control pulsewidth lower railway pressure drop △ Pstd is obtained ahead of time；△ Pstd master
If due to caused by high pressure co-rail system static state oil return；
To the identical fuel injector used online, identical starting rail pressure and critical injection control pulsewidth are first set, so that spray
Oily device executes injection action (but fuel injector not necessarily actually occurs oil spout), judges whether the rail pressure drop value measured is greater than △
Pstd；Illustrate that fuel injector has not occurred actual oil spout at this time if being not more than, rail pressure drop value still maintains initial △
Pstd specifically can increase injection control pulsewidth according to small step-length, continue to measure rail then adjustment increases injection control pulsewidth
It presses drop value and is compared with △ Pstd；When the rail pressure drop value measured is just greater than △ Pstd, illustrate that fuel injector is just at this time
Actual oil spout occurs, then the critical increased difference of injection control pulsewidth is exactly that the fuel injector needs to adjust in small oil mass region at this time
Whole injection control pwm value.
That is when injection control pulsewidth is gradually increased by step-length, a moment can be found, rail pressure drop value is opened
Begin to be greater than △ Pstd, the increase at rail pressure this moment of drop value is since actual oil spout has occurred, then this moment is exactly one
At the time of new critical injection control pulsewidth corresponds to.It is since it makes online that the critical injection control pulsewidth of fuel injector, which changes,
Caused by rear aging.
In foregoing invention content Step 1: two, three it is offline complete, to the correction of fuel injector spray characteristic full working scope to calculate
The form of machine program is realized.
The present invention has the advantages that the range of a. spray characteristic curvature correction is big, all spray regime points are covered；B, correction
Accuracy is high, due to using the method for dividing subregion the correlation of feature spray regime and non-feature operating condition is improved,
The mathematical relationship accuracy of building is good；C. the correction of fuel injector spray characteristic full working scope is automatically performed during internal combustion engine,
Without manual intervention；D. spray characteristic section correcting algorithm considers fuel injector degree of aging, for spraying oil under feature operating condition
The estimation of amount is accurately met the requirements, and does not need additional cost；E. using in small oil mass region with rail pressure is observation feature
MFMA method precision high reliability is high, relative to using the algorithm that internal-combustion engine rotational speed is observed quantity with the obvious advantage.
Detailed description of the invention
Fig. 1 is the work structuring and principle simple diagram of Electrocontrolled high-pressure common rail diesel engine of the invention.
Fig. 2 is the nominal form and the signal of independent form of electronic control common rail oil sprayer part spray characteristic curve of the invention
Figure.
Fig. 3 is electronic control common rail oil sprayer spray characteristic curve sub-zone dividing schematic diagram of the invention.
Fig. 4 is electronic control common rail oil sprayer spray characteristic curve subregion on-line correction method flow schematic diagram of the invention.
Fig. 5 is that the MFMA implementation method process of the small oil mass region of electronic control common rail oil sprayer of the invention characterized by rail pressure is shown
It is intended to.
Specific embodiment
Below with reference to specific drawings and examples, the invention will be further described.
Fig. 1 shows the simple work structuring and schematic diagram of Electrocontrolled high-pressure common rail diesel engine.System includes fuel oil storage dress
11 i.e. fuel tank is set, fuel oil therein is pumped into common rail track 13 after pressurizeing by the swabbing action of pump by high-pressure oil pump 12, altogether
Rail track 13 is a high pressure pressure accumulater, and the high pressure fuel stored in the device keeps pressure steady under control of the controller 14
It is fixed, while controller 14 is according to working condition, that is, revolving speed of internal combustion engine, throttle position and various pressure and temperature sensor controls
The fuel oil of common rail track 13 processed by fuel injector 15 spray into cylinder of internal combustion engine 16 in and with air mixing compression and combustion therein.Vapour
Subsequent mechanical gyro unit is driven to realize the power output of internal combustion engine after cylinder burning.Summary of the invention of the invention is with computer journey
The form of sequence is present in controller 14, it is therefore an objective to which the spray characteristic of real time correction fuel injector 15 is to obtaining more accurate fuel oil
Injection achievees the purpose that improve internal combustion engine situation.
Fig. 2 illustrates to spray oil mass situation under three different rail pressures in the spray characteristic curve of fuel injector 15.It is got the bid
Note 21,22 indicates the lower fuel injector spray characteristic of pressure 1；Label 23 and 24 indicates the lower fuel injector spray characteristic of pressure 2；Label
25 and 26 indicate the lower fuel injector spray characteristic of pressure 3, and 1 > pressure of pressure, 2 > pressure 3.In addition dotted line 22,24,26 indicates the type
Number nominal spray characteristic curve of the fuel injector under three pressure；Solid line 21,23,25 indicates certain fuel injector sample identical
Actual ejection characteristic under pressure is as described above according to mark for certain target distributive value (m1, m2, m3) in control unit 14
Claim spray characteristic to obtain control injection pulse width ti and control fuel oil injection action, due to single fuel injector sample and nominal injection injection
Characteristic difference will appear three actual ejections when pulsewidth ti control fuel injector injection to control under three injection pressure
Amount of fuel and nominal amount of fuel deviation △ m1, △ m2, △ m3.Therefore present invention mainly solves single fuel injector sample actual ejections
Oil spout difference problem caused by characteristic and nominal spray characteristic difference.
Fig. 3 signal obtains the fuel injector sample with certain degree of aging for meeting quantity according to progress described in summary of the invention
The result of spray characteristic curve graph sub-zone dividing.Divide to obtain subregion 33 according to certain division principle, 34,35,36,
Middle subregion 33 indicates small oil mass region, and 34 criteria for classifying of subregion is that injection control pulsewidth is bigger than normal compared to nominal control pulsewidth
15%, 35 criteria for classifying of subregion is that actual ejection oil mass relative standard sprays oil mass (in nominal spray characteristic curve) reduction
Oil mass 11%, nominally injection oil mass increases by 5% etc. to each spray regime actual ejection oil mass of subregion 36 relatively.In spray characteristic song
The method that subregion is divided in line chart can focus on the similar region of difference, moreover be easier to utilize in the subregion
Correlation calculations method searches out feature spray regime point and characteristic operating point minimum number, so that each spray regime in subregion
Point and feature spray regime point linear representation are simple.After spray regime calculates correlation two-by-two in each spray characteristic subregion
Correlation matrix is obtained, selection can cover the feature spray regime of entire subregion correlation in the case where meeting quantity the smallest situation
Point, and the linear calculation expression of each non-feature spray regime point is calculated.3 features are obtained in Fig. 3 in subregion 36
Spray regime point S31, S32, S33,2 S21 of feature spray regime point in subregion 34, S22, feature sprays work in subregion 35
1 S41 of condition point.By correlation put to the proof and combine linear fit method obtain subregion in each non-feature spray regime in feature
Spray regime point is about distributive value or the linear representation of injection control pulsewidth and fuel injector aging coefficient, such as subregion
The deviation injection oil mass of certain non-feature spray regime point calculates in 36 are as follows: △ y=a1* △ y1+a2* △ y2+r*C；Wherein a1, a2
For the expression formula coefficient of fitting, C is the linear constant of fitting, and r is fuel injector aging coefficient.It should be noted that non-in subregion
The deviation oil mass of feature spray regime is not necessarily intended to cover all feature spray regimes in the subregion.It is special so to obtain injection
All spray regime control information groups outside MFMA application method are removed within the scope of linearity curve, which includes so interior
Hold [subarea number correlated characteristic operating point spray characteristic curve correcting method fitting coefficient], and the control information group store to
In the non-volatile memory medium of controller 14.
Fig. 4 show the flow chart of spray characteristic curve real time correction during internal combustion engine operation.With in controller 14
Control program executes together, this functional module of execution step 401 beginning is implemented after operating normally control into internal combustion engine, step
402 judge whether Current internal combustion engines operating condition meets the estimation condition of feature spray regime oil mass, are in particular that internal combustion engine is each
A operating parameter meets the following conditions simultaneously: internal-combustion engine rotational speed fluctuates in threshold range, and the fluctuation of rail pressure control target value meets
Threshold range, nominal injection oil mass fluctuation meet threshold range；If step 402 satisfaction thens follow the steps 403 and otherwise executes step
Rapid 401 circulation waits until to meet condition until internal combustion engine operation operating condition；Step 403 judges that fuel injector work operating condition is under current steady state
The no feature spray regime condition met in the subregion (finds the neighbouring feature spray regime of work at present spray regime point
Point), it is in particular current rail pressure and injection control width parameter (Pinj, Linj) and feature spray regime point
The approximation of rail pressure and injection control width parameter (Pstd, Lstd), quantizating index be abs (Pinj-Pstd)≤△ P and
Abs (Linj-Lstd)≤△ L；If step 403, which meets condition, thens follow the steps 404, otherwise return step 401；Step 404
The actual ejection oil mass Mij for implementing feature spray regime point is calculated, and wherein i indicates that the ith feature in the subregion sprays work
Condition point, j indicate the jth implemented to ith feature spray regime point time estimation；Injection action is drawn in computer program acquisition trajectory
DP drops in the rail pressure risen, and fuel oil temperature Tf, injection control pulsewidth L estimate that spray characteristic locating for Current internal combustion engines operating condition is bent
The practical fuel oil of each feature spray regime point in line subregion sprays Mij, the calculation formula of Mij are as follows: Mij=K*dP*V*f1*
f2
Wherein, K indicates the bulk modulus of fuel oil；DP indicates pressure drop caused by injection action, V track volume, f1
Indicate the modifying factor due to caused by the rail pressure difference of rail pressure and feature spray regime, f2 is indicated due to injection control pulsewidth
With correction factor caused by the injection control pulse width difference under feature spray regime；Step 404 executes step 405 after being finished
Judge whether the feature spray regime point calculation times j currently calculated is satisfied with counts requirement, executes step 409 again if not
It is average using seeking if the secondary injection oil mass counts calculated under this feature operating condition, which have been met the requirements, thens follow the steps 406
The method of value obtains the injection oil mass estimated value Mi of a certain feature spray regime in the subregion；This feature spray regime point
Injection oil mass estimated value Mi and nominal spray characteristic curve compare and obtain feature spray regime point distributive value deviation；Step 406
Execute whether all step 407 judges the actual ejection oil mass estimation of all injection characteristics operating points in the subregion after being finished
It has calculated and has finished, executed step 408 if not and calculate next feature spray regime point actual ejection oil mass, if executing step
410；The injection oil mass estimated value Mi for calculating and finishing in the subregion, the injection of each feature spray regime point are combined in step 410
Oil mass estimated value Mi and nominal spray characteristic curve, which compare, obtains feature spray regime point distributive value deviation；Utilize step 3 structure
The mathematical relationship of non-the feature spray regime point and feature spray regime point built, to non-feature spray regime points all in subregion
Spray characteristic is corrected.The spray characteristic curvature correction process in step 411 one sub-regions of end is executed later.It needs
Bright above-mentioned calculating process is to the mathematical relationship application implementation process for taking deviation oil mass as input creation, for injection control
Pulsewidth be input correction relationship, only by the aging coefficient in the mathematical relationship of building in subregion feature spray regime
With the correction injection control pulsewidth of non-feature spray regime response.
In small oil mass region shown in Fig. 5 is to observe the MFMA spray characteristic bearing calibration implementing procedure of feature with rail pressure.
Process is realized in the form of computer program to be executed together with internal combustion engine control program.It executes step 501 and enters program, execute step
502 judge whether engine operating condition meets the requirements, and more precisely engine is in towing astern and slides or rapidly oil-break state, if
Condition, which meets, executes step 503 otherwise return step 501；Relevant control parameter setting is executed in step 503, is specifically wrapped
It includes and the pump oil into track 13 of high-pressure oil pump 12 is forbidden to act, manual setting injection action originates rail pressure and critical injection control arteries and veins
It is wide；It should be noted that needing to obtain the critical injection control pulsewidth of corresponding fuel injector before carrying out this program and starting, at this
Originating fuel injector actual ejection oil mass under rail pressure and critical injection control pulsewidth is critical zero oil mass (spraying without fuel oil), but
It is that high pressure co-rail system static state oil return causes rail pressure to decline, can be obtained ahead of time under starting rail pressure and critical injection control pulsewidth
Rail pressure drop-out value △ Pstd；
It executes step 504 and judges whether calibration object fuel injector corresponding i-th of cylinder acquisition section starts, if not up to
Acquisition section starting point then waits in program and executes step 506 until being judged as true, is provided in step 506 using other hardware timings
Source is with fixed sample frequency acquisition rail pressure value and stores, and fuel injector is corrected in collection process and is carried out under response control parameter
Injection action (actual fuel injection not necessarily occurs) executes step 507 after the i-th cylinder acquires section；It is so-called herein
Acquisition section referred to comprising a period of time including fuel injector injection action, and the acquisition section of the i-th cylinder must not be with other cylinders
Section is acquired to be overlapped；High frequency filter filtering is carried out to the rail pressure characteristic value of acquisition in step 507, filters out wherein possible high frequency
Rail pressure characteristic value is calculated after signal section, typical rail pressure characteristic value refers to acquisition section internal rail pressure drop value △ P；
It executes step 508 and judges whether the rail pressure characteristic value calculated meets the requirements, otherwise executed if so then execute step 509
Step 511；Judging whether rail pressure characteristic value meets the requirements preferably can determine whether in identical starting rail pressure and critical injection control
Pulsewidth judges whether the rail pressure drop value measured is greater than △ Pstd so that fuel injector executes injection action；Illustrate if being not more than
Fuel injector has not occurred actual oil spout at this time, and rail pressure drop value still maintains initial △ Pstd, then adjustment increases injection
Control pulsewidth, specifically can increase injection control pulsewidth according to small step-length, continue to measure rail pressure drop value and with △ Pstd couple
Than；When the rail pressure drop value measured is just greater than △ Pstd, illustrate that actual oil spout just occurs for fuel injector at this time, then at this time
The critical increased difference of injection control pulsewidth is exactly the injection control pwm value that the fuel injector needs to adjust in small oil mass region.
The rail pressure characteristic value calculated in step 508 if the requirements are not met then follow the steps 511 by increase injection control
Pulsewidth re-calls MFMA calculating process；Rail pressure characteristic value executes step 509 the i-th cylinder injector of correction in small oil after meeting condition
Measure the spray characteristic in region；It executes step 510 and judges whether the corresponding fuel injector of all cylinders of the internal combustion engine is completed small
Spray characteristic correction in oil mass region, if not completing to execute step 512 for the corresponding fuel injector execution of next cylinder
MFMA；The corresponding fuel injector of all cylinders of internal combustion engine completes spray characteristic correction, calculating process in small oil mass region
Terminate.
Claims (8)
1. a kind of electronic control common rail oil sprayer full working scope spray characteristic on-line correction method, which comprises the following steps:
Step 1 creates the nominal spray characteristic curve of electronic control common rail oil sprayer；
Electronic control common rail oil sprayer spray characteristic curve graph is divided into multiple subregions by step 2；
Step 3 finds the spy for characterizing the subregion other than the subregion in small oil mass region in other each sub-regions
Spray regime point is levied, and constructs the mathematical relationship of non-feature spray regime point and feature spray regime point in subregion；Small oil mass
Region refers to that injection control pulsewidth and rail pressure in spray characteristic curve graph are respectively less than the region of predetermined value；
Step 4 in common-rail injector operation, is found the neighbouring feature spray regime point of work at present spray regime point, is being found
Feature spray regime point where in subregion, utilize the non-feature spray regime point and feature spray regime point of step 3 building
Mathematical relationship, to non-feature spray regime point carry out spray characteristic amendment, thus the spray in on-line amending corresponding sub-region
Penetrate characteristic curve；
Step 5, used in small oil mass region MFMA method characterized by rail pressure to the spray characteristic curve in the region into
Row correction.
2. electronic control common rail oil sprayer full working scope spray characteristic on-line correction method as described in claim 1, it is characterised in that:
The step 2 specifically: obtain the fuel injector sample for meeting the different degree of agings of quantity, be based on fuel injector experimental bench
The independent spray characteristic curve of each fuel injector sample is regained relative to nominal spray characteristic curve in identical control parameter control
Distributive value deviation under system, and subregion is divided according to spray characteristic deviation of the statistical method to identical degree of aging.
3. electronic control common rail oil sprayer full working scope spray characteristic on-line correction method as claimed in claim 2, it is characterised in that:
Spray characteristic deviation institute foundation in step 2 are as follows: sub-district is divided according to the inclined absolute value of the difference of injection oil mass in small oil mass region
Domain；In other regions according to the percentage or the inclined absolute value of the difference of injection control pulsewidth or injection control arteries and veins of injection oil mass deviation
The percentage of wide deviation divides subregion.
4. electronic control common rail oil sprayer full working scope spray characteristic on-line correction method as described in claim 1, it is characterised in that: institute
Step 3 is stated to specifically include:
To the fuel injector of fuel injector spray characteristic curve graph identical degree of aging in each sub-regions in addition to small oil mass region
The distributive value deviation data ((△ M11 ... △ M1 (n-1), △ M1n) of sample；(△M21……△M2(n-1),△
M2n,)；... (△ Mm1 ... △ Mm (n-1), △ Mmn)), m represents spray regime number in subregion, and n represents same injection
The fuel injector sample of important quantity in operating condition, every two groups of data mutually ask correlation statistics to calculate the phase obtained in the subregion
Closing property matrix；Selection can meet the requirements operating condition with all fuel oil spray regime correlations of the subregion range and spray as feature
Operating point (feature operating condition 1, feature operating condition 2 ... feature operating condition k), in feature spray regime point and non-feature spray regime point
Construct mathematical relationship.
5. electronic control common rail oil sprayer full working scope spray characteristic on-line correction method as claimed in claim 4, it is characterised in that:
The mathematical relationship of building is showed with linear representation；Distributive value deviation of the non-feature spray regime point under certain degree of aging
Are as follows: △ y=a1* △ y1+a2* △ y2+ ... an* △ yj+r*C, wherein a1, a2 ... an are the expression formula coefficient of fitting, △ y
For distributive value deviation of the non-feature spray regime point a certain in the subregion under the degree of aging, △ yj is to spray with non-feature
The relevant feature spray regime point distributive value deviation of operating point is penetrated, wherein j is less than or equal to k, and C is constant, after introducing aging coefficient r
Constitute the mathematical relationship of distributive value deviation between the non-feature spray regime point in the subregion and feature spray regime point.
6. electronic control common rail oil sprayer full working scope spray characteristic on-line correction method as claimed in claim 5, it is characterised in that:
In step 4, after subregion where searching out feature spray regime point,
Estimate each reality of each feature spray regime point in spray characteristic curve subregion locating for Current internal combustion engines operating condition
Spray oil mass Mij；
The injection oil mass estimated value Mi of each feature spray regime point in the subregion is obtained using the method for averaged；
The injection oil mass estimated value Mi and nominal spray characteristic curve of each feature spray regime point, which compare, obtains feature injection work
Condition point distributive value deviation；
Using the mathematical relationship of non-the feature spray regime point and feature spray regime point of step 3 building, own in subregion
Non-ejection characteristic operating point spray characteristic is corrected.
7. electronic control common rail oil sprayer full working scope spray characteristic on-line correction method as described in claim 1, which is characterized in that step
In rapid five,
Obtain the starting rail pressure and critical injection control pulsewidth of a fuel injector；And starting rail pressure and critical injection control is obtained ahead of time
Pulsewidth lower railway pressure drop △ Pstd；
To the identical fuel injector used online, identical starting rail pressure and critical injection control pulsewidth are first set, so that fuel injector
Injection action is executed, judges whether the rail pressure drop value measured is greater than △ Pstd；If increasing injection control no more than so adjustment
Pulsewidth continues to measure rail pressure drop value and compare with △ Pstd；When the rail pressure drop value measured be just greater than △ Pstd when, then this
When the critical increased difference of injection control pulsewidth be exactly injection control pwm value that the fuel injector needs to adjust in small oil mass region.
8. electronic control common rail oil sprayer full working scope spray characteristic on-line correction method as claimed in claim 7, which is characterized in that step
In rapid five, injection control pulsewidth is increased by step-length.
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| CN108361139B (en) * | 2018-01-29 | 2020-08-25 | 中国第一汽车股份有限公司 | Fuel injector small oil quantity control method |
| CN109915271B (en) * | 2019-02-21 | 2021-08-13 | 浙江吉利控股集团有限公司 | Control method of methanol engine fuel injection amount, electronic control unit and vehicle |
| CN110414055B (en) * | 2019-06-27 | 2022-06-28 | 厦门东亚机械工业股份有限公司 | Method for obtaining air compressor discharge capacity nozzle coefficient and discharge capacity obtaining method |
| CN111810309B (en) * | 2020-06-23 | 2022-11-01 | 哈尔滨工程大学 | High-pressure common rail system oil injection quantity prediction method based on closed-loop observer |
| CN113153553B (en) * | 2021-03-23 | 2022-08-26 | 长沙理工大学 | Optimization method for linear characteristic of oil injection quantity of electric control oil injector |
| CN113931760B (en) * | 2021-09-26 | 2023-09-29 | 东风商用车有限公司 | Power-on pulse width correction verification method and system for gas engine nozzle |
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| CN101050734A (en) * | 2007-01-19 | 2007-10-10 | 清华大学 | High pressure co-rail electric control fuel injection system |
| CN101865044A (en) * | 2010-02-01 | 2010-10-20 | 东风朝阳柴油机有限责任公司 | Multi-power output controller of electric control diesel engine |
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| CN101050734A (en) * | 2007-01-19 | 2007-10-10 | 清华大学 | High pressure co-rail electric control fuel injection system |
| CN101865044A (en) * | 2010-02-01 | 2010-10-20 | 东风朝阳柴油机有限责任公司 | Multi-power output controller of electric control diesel engine |
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