CN104504244A - Method for estimating spray amount of oil sprayer - Google Patents
Method for estimating spray amount of oil sprayer Download PDFInfo
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- CN104504244A CN104504244A CN201410729401.0A CN201410729401A CN104504244A CN 104504244 A CN104504244 A CN 104504244A CN 201410729401 A CN201410729401 A CN 201410729401A CN 104504244 A CN104504244 A CN 104504244A
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Abstract
The invention provides a method for estimating the spray amount of an oil sprayer. The method comprises the following steps: 1, selecting representativeoil sprayers with the same types as a training set; 2, measuring, analyzing and collecting different set rail pressures, oil sprayer transverse cavity pressure parameter indexes under the controlled pulse width, actual rail pressures in common rail pipes and oil sprayer spray amount data; 3, taking the oil sprayer transverse cavity pressure parameter indexes obtained by measurement, namely the lowest value of the transverse cavity pressure, the time corresponding to the lowest value ofthe transverse cavity pressure, the highest value of the transverse cavitypressure and the time corresponding to the highest value of the transverse cavity pressure as selectable independent variables, taking the actual rail pressures in the common rail pipes as requiredindependent variables, and taking the oil sprayer spray amount as a dependent variable; 4, creating a mathematical prediction model according to the independent variables and the dependentvariable; 5, obtaining transverse cavity pressure parameter indexes of an unknown oil sprayer sample, and determining the estimated spray amount of the unknown oil sprayer according to the mathematical prediction model. According to the method, the spray amount can be estimated in real time under all working conditions, and an oil sprayer body does not need to be destroyed.
Description
Technical field
The fuel that the present invention relates to internal combustion engine sprays, and the fuel in particular for the common rail fuel injection system of diesel engine sprays, and more specifically, the present invention relates to the method estimating fuel quantity.
Background technology
Existing fuel quantity method of estimation and device have:
Application number is the patented claim of 200910126742.8, estimates the method for the fuel injector institute amount of fuel injected of internal combustion engine.The predetermined harmonic component power of this invention computing fuel thrower tach signal that emitted dose produces within the actuation duration, and using the valuation of calculated performance number as the fuel quantity of thrower actual ejection.
The patent of application number 200810130055.9, can the fuel injection control system of fuel quantity deviation that sprays of compensate for fuel thrower.This invention is determined in fact from the fuel quantity of fuel injector ejection based on the increase of engine speed.
These two the same Problems existing of invention are when utilizing tach signal or its eigenwert carries out the estimation of emitted dose, the impact that when rotating speed is inevitably subject to vehicle operating, random road bump, gear impact and produce disturbance thus affect the accuracy of signal.In addition, application number be 200810130055.9 invention be only applicable to the estimation of little emitted dose, due to the method need at engine without fuel injection period additionally to cylinder injection fuel, if spray large emitted dose can produce obvious torque vibration thus the comfortableness affecting vehicle, and produce noise.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of method of estimation of carrying out the fuel injector emitted dose of real-time online is provided.
According to the principle of work of electronic control common rail oil sprayer, pulpit is the key structure of electric-controlled fuel injector, fuel pressure variable condition in pulpit determines the open/close states of injector valve indirectly, and plays conclusive effect to the important performance such as emitted dose size, lag characteristic, injection extended period of fuel injector.And the fuel pressure fluctuation in transverse chamber of oil sprayer changes closely related with the fuel pressure in pulpit, and the fuel pressure obtained in horizontal chamber is not owing to needing to destroy injector body, therefore horizontal chamber fuel pressure is easier than pulpit fuel pressure carries out measurement acquisition.Therefore, design of the present invention is exactly by building the pressure characteristic parameter of fuel injector and the incidence relation of emitted dose, realizes the object of prediction fuel injector actual ejection amount.
Solution is at transverse chamber of oil sprayer place setting pressure sensor, according to the fuel pressure measuring-signal returned, analyze and extract horizontal cavity pressure fluctuation partial parameters index, using its together with rail pressure actual in common rail pipe as independent variable, fuel injector actual ejection amount carries out multiple linear regression modeling as dependent variable.Above-mentioned parameter index comprises horizontal cavity pressure mxm. and corresponding time thereof, horizontal cavity pressure minimum and corresponding time thereof.
The technical solution used in the present invention is:
In use transverse chamber of oil sprayer pressure parameter index, associating common rail pipe, actual rail pressure is as independent variable, and fuel injector actual ejection amount carries out multiple linear regression modeling as dependent variable, according to the mathematical forecasting model set up, determines the estimation emitted dose of unknown fuel injector.
The method specifically comprises the steps:
Step one. choose the representative fuel injector of same model as training set;
Step 2. Measurement and analysis also collects actual rail pressure and fuel injector emitted dose data in different set rail pressure, the transverse chamber of oil sprayer pressure parameter index controlled under pulsewidth, common rail pipe;
Step 3. will the minimum of transverse chamber of oil sprayer pressure parameter index and the horizontal cavity pressure obtained and corresponding time thereof and horizontal cavity pressure mxm. and corresponding these four variablees of time thereof be measured as optional independent variable, using rail pressure actual in common rail pipe as essential independent variable, fuel injector emitted dose is as dependent variable;
Step 4. set up mathematical forecasting model according to above-mentioned independent variable and dependent variable; Comprise:
A, optional independent variable is carried out independent variable screening, concrete steps comprise:
A1, calculate interactive relation between four optional independents variable and dependent variable, i.e. Pearson correlation coefficient r
xy, computing formula is as follows:
Wherein
for the sample mean of independent variable,
for the sample mean of dependent variable, n is number of samples;
A2, compare four related coefficient sizes, choose larger two as the model independent variable filtered out;
B, using in two horizontal cavity pressure eigenwerts filtering out and common rail pipe, actual rail pressure is as independent variable, and fuel injector emitted dose data set up mathematical prediction model regression equation as dependent variable, y=b
0+ b
1x
1+ b
2x
2+ b
3x
3, wherein, b
0, b
1, b
2, b
3for multivariate regression coefficients, x
1, x
2, x
3for the one group of independent variable observed, y is dependent variable;
C, employing least square method estimate multivariate regression coefficients b
0, b
1, b
2, b
3, obtain regression equation;
Step 5. for unknown fuel injector sample to be measured, first measure its horizontal cavity pressure, calculate and obtain its horizontal cavity pressure parameter index, the regression equation that then input above-mentioned steps four is set up determines the estimation emitted dose of unknown fuel injector.
The invention has the advantages that: the present invention is from the angle of electric-controlled fuel injector architectural characteristic and Principle of Statistics, the method of estimation of fuel injector emitted dose is proposed according to System empirical data modeling, when not destroying injector body, only need to install additional the accurate estimation that a pressure transducer can realize fuel injector emitted dose.With existing scheme by compared with the method for additionally to carry out estimating emitted dose at engine without fuel injection period to cylinder injection fuel thus according to the transient speed increment obtained, the present invention can carry out the real-time emitted dose estimation under full working scope, and existing scheme is only applicable to the estimation of little emitted dose, and easily causing the discomfort of driver, extra injection also can make fuel economy be deteriorated.
Accompanying drawing explanation
Fig. 1 is high-pressure common-rail fuel system structure diagram of the present invention.
Fig. 2 is electric-controlled fuel injector structural drawing of the present invention.
Fig. 3 is horizontal cavity pressure of the present invention, controls pulsewidth and injection rate curve map.
Fig. 4 is horizontal cavity pressure parameter index schematic diagram of the present invention.
Fig. 5 is process flow diagram of the present invention.
Embodiment
Below in conjunction with concrete drawings and Examples, the invention will be further described.
Fig. 1 is high-pressure common-rail fuel system structure diagram.Figure intermediate fuel oil is sucked into secondary fuel oil filter 2 from the fuel tank 1 of strainer filter, wherein a part of fuel oil forms high pressure fuel in the plunger cavity pressurization of high-pressure oil pump 3 and flows through high-pressure oil pipe from oil pump outlet valve mouth and collects into common rail pipe 5, high-pressure injection for fuel injector 7 provides the stable source of high pressure continued, and redundance flows back to fuel tank 1 from the surplus valve on oil pump together with fuel injector 7 oil return; High pressure fuel flows to the fuel injector 7 of each cylinder respectively through high-pressure oil pipe from common rail pipe 5; The pulse given time that fuel injector 7 exports according to electronic control unit ECU 8 and given width, spray into fuel oil in the firing chamber of each cylinder of engine by feature spray characteristic.Common rail pipe 5 one end is provided with rail pressure sensor 6, and the rail pressure situation in real time in monitoring common rail pipe, when rail pressure exceedes the mxm. of permission, blowdown valve 4 is opened, and the rail pressure in common rail pipe is reduced to rapidly in safe range, to ensure the safety of whole system.The electronic control unit 8 of common rail system gathers the diesel engine and common rail system state parameter that each sensor detects in real time, accurate current pulse signal is sent by built-in control strategy and storage data, and make corresponding common rail pump solenoid valve, fuel injector magnetic system etc. produce electromagnetic force, to drive corresponding actuator to carry out action, make to carry out feedback regulation for emitted dose, rail pressure, oil spout angle and spray emitted dose by demand.The sensor 9 that co-rail oil injection system adopts comprises: speed probe, common rail pressure sensor, cooling-water temperature transmitter, fuel temperature sensor, CKP (or CMP), accelerator pedal sensor etc. are multiple, some engines are also equipped with: vehicle speed sensor, air flow sensor, barometric pressure sensor, boost-pressure sensor, other sensors such as atmosphere temperature transducer.The actuator driven signal 10 of electronic control unit 8 comprises: fuel injector magnetic system and high-pressure oil pump solenoid-driven signal.
Fig. 2 is a kind of schematic diagram of the electric-controlled fuel injector 7 for high-pressure common-rail fuel system.Fuel injector 7 is provided with the needle-valve 18 that can be positioned on valve seat 22, and top and the valve seat 22 of needle-valve 18 are formed with suction chamber 20, and valve seat 22 is provided with spray-hole 21 on the top of suction chamber 20, is formed with pressure accumulating chamber 19 around needle-valve 18 and between valve seat 22.Pressure accumulating chamber 19 is connected to common rail pipe 5 by a fuel delivery pipeline, and this fuel delivery pipeline passes the inside of fuel injector 7 inside and fuel supply pipe, i.e. pressure duct 24.Common rail pipe 5 supplies high pressure fuel by pressure duct 24 to pressure accumulating chamber 19.Fuel injector 7 inside is provided with pulpit 16, is provided with piston 17 between pulpit 16 and pressure accumulating chamber 19, is provided with spring 23 in piston 17 and fuel injector 7 body, and spring 23 pairs of pistons have downward acting force.Pulpit 16 is connected to pressure duct 24 by oil supply hole 15, and pulpit 16 is provided with oil leak hole 13 simultaneously, and what act on oil leak hole 13 upper end is operation valve 12, and operation valve 12 is by the control of fuel injector magnetic system 11.
When electronic control unit 8 is to fuel injector magnetic system 11 sending controling instruction, fuel injector magnetic system 11 makes operation valve 12 rise and opens oil leak hole 13, fuel oil flows back to fuel tank by spill port 14, and in pulpit 16, pressure declines thereupon, thus makes piston 17 act on pressure drop on needle-valve 18.When pressure accumulating chamber 19 raising force acted on needle-valve 18 is greater than piston 17 and spring 23 acts on the downward force on needle-valve 18, needle-valve 18 is lifted off a seat, and spray-hole 21 starts inject high pressure fuel oil.At the end of the steering order that electronic control unit 8 sends, fuel injector magnetic system 11 and operation valve 12 close oil leak hole 13.High pressure fuel enters in pulpit 16 through oil supply hole 15, and pressure in pulpit 16 is raised, and the pressure acted on piston 17 strengthens, and forces needle-valve 18 again to fall back on valve seat 22, closes spray-hole 21, stop oil spout.Now, the fuel leakage only having the inner each parts gap of fuel injector to produce flows back to fuel tank by spill port 14.
Install pressure transducer 25 additional in horizontal chamber before pressure duct 24, and carry out the pressure survey of horizontal chamber oil circuit.
In Fig. 3, A point is horizontal cavity pressure decline initial point, along with electronic control unit 8, control pulsewidth is applied to fuel injector magnetic system 11, the ball sealer of operation valve 12 starts to lift thus causes fuel oil to reveal, in pulpit 16, oil pressure causes horizontal cavity pressure also to decline immediately while declining, oil pressure drops to a certain degree breaks original hydraulic resistance balance afterwards, oil nozzle needle-valve 18 is opened near B point, fuel injector commencement of fuel injection.Simultaneously horizontal cavity pressure constantly declines until controls pulsewidth in the end of C point due to the acting in conjunction of fuel injector oil spout and draining, and ball sealer is taken a seat and pulpit 16 is closed, and horizontal cavity pressure starts rising.Now, control piston moves down due to the effect of upper and lower two ends pressure reduction, and pulpit 16 volume increases pressure and reduces and cause horizontal cavity pressure to start decline at D point, and needle-valve 18 is closed, end of injection.According to above-mentioned analysis, research finds there is corresponding relation between injection rate variation rule curve and horizontal cavity pressure, the minimum of horizontal cavity pressure and corresponding time thereof and mxm. and the corresponding shape of time to fuel injection characteristic thereof play key effect (see Fig. 4), visible, horizontal cavity pressure can objectively respond the situation of change of fuel injector injection rate, and namely the integration of injection rate is fuel injector emitted dose, therefore calculates emitted dose have scientific basis by obtaining horizontal cavity pressure index.
Comprehensive consideration is carried out from aspects such as the influence degree to fuel injector emitted dose, ECU computing power and acquisition complexities, the minimum of horizontal cavity pressure and corresponding time thereof and horizontal cavity pressure mxm. and corresponding these four variablees of time thereof are extracted as horizontal cavity pressure parameter index as optional input quantity, in measurement common rail pipe 5, actual rail pressure is as essential input quantity, fuel injector emitted dose builds multivariate regression model as output quantity, namely utilizes this model to carry out the estimation of fuel injector emitted dose.
Particularly, the fuel injector emitted dose method of estimation that the present invention proposes, comprises the steps:
Step one. choose the representative fuel injector of same model as training set;
In this step, for the fuel injector of a serial model No., then choose the representative of the stable fuel injector of one of them spray characteristic as this model, as the standard model setting up this model fuel injector emitted dose model.
For the fuel injector of other model, inconsistent due to fuel injector structure difference, therefore emitted dose model also can be different, and the fuel injector of different model needs to set up respective fuel injector emitted dose model.
Step 2. Measurement and analysis also collects actual rail pressure and fuel injector emitted dose data in different set rail pressure, the transverse chamber of oil sprayer pressure parameter index controlled under pulsewidth, common rail pipe;
In this step, under special experiment condition, Measurement and analysis rail pressure, transverse chamber of oil sprayer pressure parameter index and fuel injector emitted dose data under collecting different operating mode are as training set; Described different operating mode determined by different rail pressure and control pulsewidth.
Carry out the horizontal cavity pressure of sample fuel injector and the DATA REASONING collection of emitted dose at oil pump test stand, test condition is set as stand rotating speed to control at 800rpm, and Oil-temperature control is at 40 DEG C.A hole slot is opened in transverse chamber of oil sprayer oil input channel, pressure transducer 25 placed and fixes wherein to measure the pressure in transverse chamber of oil sprayer, analyze and collect different set rail pressure, the actual rail pressure controlled under pulsewidth, horizontal cavity pressure parameter index (i.e. horizontal cavity pressure mxm. and corresponding time, horizontal cavity pressure minimum and correspondence time thereof) and fuel injector emitted dose data.Setting rail pressure is from 500bar ~ 1100bar, and interval 100bar, control pulsewidth from 700us ~ 2500us, interval 100us, is divided into 133 operating condition of test, corresponding collection 133 groups of test figures.
Step 3. will the minimum of transverse chamber of oil sprayer pressure parameter index and the horizontal cavity pressure obtained and corresponding time thereof and horizontal cavity pressure mxm. and corresponding these four variablees of time thereof be measured as optional independent variable, using rail pressure actual in common rail pipe as essential independent variable, fuel injector emitted dose is as dependent variable;
Step 4. set up mathematical forecasting model according to above-mentioned independent variable and dependent variable; Specifically comprise:
A, optional independent variable is carried out independent variable screening, concrete steps comprise:
A1, calculate interactive relation between 4 optional independents variable and dependent variable, i.e. Pearson correlation coefficient r
xy, computing formula is as follows:
Wherein
for the sample mean of independent variable,
for the sample mean of dependent variable, n is number of samples (i.e. operating condition of test number);
Independent variable herein or the sample mean of dependent variable are the mean value of repetitive measurement value under same operating mode, and such as fuel injector emitted dose is the mean value using EFS single-time injection instrument to carry out continuous 200 emitted doses sampling of fuel injector.
The related coefficient calculating four independents variable and dependent variable according to above formula is as shown in the table:
A2, compare four related coefficient sizes, choose larger two as the model independent variable filtered out;
According to upper table result of calculation, be followed successively by the horizontal cavity pressure mxm. > mxm. corresponding time > horizontal cavity pressure minimum > minimum corresponding time from big to small with dependent variable related coefficient.Therefore, the horizontal cavity pressure mxm. time corresponding to mxm. is chosen as the model independent variable filtered out.
B, using in two horizontal cavity pressure eigenwerts filtering out and common rail pipe, actual rail pressure is as independent variable, and fuel injector emitted dose data set up mathematical prediction model regression equation as dependent variable, y=b
0+ b
1x
1+ b
2x
2+ b
3x
3, wherein, b
0, b
1, b
2, b
3for multivariate regression coefficients, x
1for the horizontal cavity pressure mxm. of each operating point, x
2for the horizontal cavity pressure mxm. of each operating point corresponding time, x
3for the actual rail pressure of each operating point, y is each operating point fuel injector emitted dose;
C, employing least square method estimate multivariate regression coefficients b
0, b
1, b
2, b
3, obtain regression equation;
Y＝-209.648+1.276x
1+1.431x
2+10.155x
3
Step 5. for unknown fuel injector sample to be measured, first measure its horizontal cavity pressure, calculate and obtain its horizontal cavity pressure parameter index, the regression equation that then input above-mentioned steps four is set up determines the estimation emitted dose of unknown fuel injector.
Test is chosen 28 operating modes and is carried out emitted dose calculating, and shown in concrete data see the following form, error, within ± 3%, can meet the demands.
In upper form, the unit of emitted dose is mm
3.
Claims (5)
1. a fuel injector emitted dose method of estimation, is characterized in that:
In use transverse chamber of oil sprayer pressure parameter index, associating common rail pipe, actual rail pressure is as independent variable, and fuel injector actual ejection amount carries out multiple linear regression modeling as dependent variable, according to the mathematical forecasting model set up, determines the estimation emitted dose of unknown fuel injector.
2. fuel injector emitted dose method of estimation as claimed in claim 1, it is characterized in that, the method specifically comprises the steps:
Step one. choose the representative fuel injector of same model as training set;
Step 2. Measurement and analysis also collects actual rail pressure and fuel injector emitted dose data in different set rail pressure, the transverse chamber of oil sprayer pressure parameter index controlled under pulsewidth, common rail pipe;
Step 3. will the minimum of transverse chamber of oil sprayer pressure parameter index and the horizontal cavity pressure obtained and corresponding time thereof and horizontal cavity pressure mxm. and corresponding these four variablees of time thereof be measured as optional independent variable, using rail pressure actual in common rail pipe as essential independent variable, fuel injector emitted dose is as dependent variable;
Step 4. set up mathematical forecasting model according to above-mentioned independent variable and dependent variable; Comprise:
A, optional independent variable is carried out independent variable screening, concrete steps comprise:
A1, calculate interactive relation between four optional independents variable and dependent variable, i.e. Pearson correlation coefficient r
xy, computing formula is as follows:
Wherein
for the sample mean of independent variable,
for the sample mean of dependent variable, n is number of samples;
A2, compare four related coefficient sizes, choose larger two as the model independent variable filtered out;
B, using in two horizontal cavity pressure eigenwerts filtering out and common rail pipe, actual rail pressure is as independent variable, and fuel injector emitted dose data set up mathematical prediction model regression equation as dependent variable, y=b
0+ b
1x
1+ b
2x
2+ b
3x
3, wherein, b
0, b
1, b
2, b
3for multivariate regression coefficients, x
1, x
2, x
3for the one group of independent variable observed, y is dependent variable;
C, employing least square method estimate multivariate regression coefficients b
0, b
1, b
2, b
3, obtain regression equation;
Step 5. for unknown fuel injector sample to be measured, first measure its horizontal cavity pressure, calculate and obtain its horizontal cavity pressure parameter index, the regression equation that then input above-mentioned steps four is set up determines the estimation emitted dose of unknown fuel injector.
3. fuel injector emitted dose method of estimation as claimed in claim 2, is characterized in that:
In described step 2, the experiment condition carrying out measuring is: stand rotating speed controls at 800rpm, and Oil-temperature control is at 40 DEG C.
4. fuel injector emitted dose method of estimation as claimed in claim 2, is characterized in that:
In described step 2, obtain actual rail pressure and fuel injector emitted dose data in the transverse chamber of oil sprayer pressure parameter index under 133 different operating modes, common rail pipe altogether.
5. fuel injector emitted dose method of estimation as claimed in claim 2, is characterized in that:
The concrete grammar that transverse chamber of oil sprayer pressure parameter index measurement adopts is: in transverse chamber of oil sprayer oil input channel, open a hole slot, placed by pressure transducer and fix wherein to measure the pressure in transverse chamber of oil sprayer.
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| CN108227077A (en) * | 2017-12-29 | 2018-06-29 | 诺仪器（中国）有限公司 | Ribbon fiber splice loss, splice attenuation evaluation method and system |
| CN111473908A (en) * | 2020-04-20 | 2020-07-31 | 北京理工大学 | Pressure measuring device, method and system for pressure chamber of common rail fuel injector |
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| CN108227077A (en) * | 2017-12-29 | 2018-06-29 | 诺仪器（中国）有限公司 | Ribbon fiber splice loss, splice attenuation evaluation method and system |
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