CN104295425B - Oil injection law measuring system and method - Google Patents
Oil injection law measuring system and method Download PDFInfo
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- CN104295425B CN104295425B CN201410248080.2A CN201410248080A CN104295425B CN 104295425 B CN104295425 B CN 104295425B CN 201410248080 A CN201410248080 A CN 201410248080A CN 104295425 B CN104295425 B CN 104295425B
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- oil
- measuring system
- oil injection
- fuel
- piezoelectric transducer
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Abstract
The invention relates to an oil injection law measuring system and method. In the measuring system, an oil injection hole and a piezoelectric sensor are correspondingly arranged, and a distance adjusting device is additionally arranged to be used for adjusting the distance between the piezoelectric sensor and the oil injection hole. According to the method, the output signal start-stop interval time of the sensor and the oil injection extended period are compared, the distance adjusting device is driven to adjust the distance between the sensor and the oil injection hole until the output signal start-stop interval time of the sensor and the oil injection extended period are basically the same and the output waveform of the sensor is mostly stable, and at the moment, the position of the sensor is the optimum flow measuring position. By means of the oil injection law measuring system and method, it is guaranteed that measuring can be conducted in a liquid phase fluid area, and meanwhile measuring stability can be guaranteed.
Description
Technical field
The present invention relates to a kind of fuel injection characteristic measuring system and measuring method.
Background technology
The fuel supply of electromotor usually applies fuel-injected method to generate tiny oil droplet group, it is therefore an objective to increase
The evaporation pneumatization of fuel oil, increases combustion heat release amount.This is a considerably complicated problem.Fuel spray is not only subject to oil spout
Device version (in diesel engine using more be multiple orifice nozzle), injection pressure, the impact of needle lift, also by cylinder
Interior pressure, temperature, the impact of air motion (including macroscopic view flowing and turbulent flow).The oily Shu Shengcheng mistakes that fuel oil is entered after cylinder
Journey is again sufficiently complex, and it includes oily beam atomization, Oil Droplet Breakup, oil droplet collision and polymerization, and oily beam is rebuffed and fuel oil Multiple components
Evaporation etc.；The major part oil droplet of oily beam is very intensive, can form a liquid core from fuel injector outlet, and its length is again
Receive the impact of fuel injector structure.
A kind of Chinese patent document " the effective actual internal area in each hole of diesel injector of Application No. 20110095233
Measuring method ", is related to measure the injection pressure that nozzle opening sprays by piezoelectric transducer, and is converted oil spout by injection pressure
Amount.
Above-mentioned patent passes through strokes law and the conservation of momentum calculates distributive value.But in fact, sprayed oil beam is sprayed from nozzle opening
Two regions, i.e. liquid phase fluid area and non-liquid fluid zone can be in turn divided into after going out, in liquid phase fluid area, spraying is main to show
For fluid oil beam；And in non-liquid fluid zone, fluid oil beam is gradually atomized.
Only in liquid phase fluid area, measure pressure can accurate acquisition and the corresponding relation of flow, in non-liquid stream
Body area, the linearity are very poor.How to ensure that measurement is very crucial problem in liquid phase fluid area.
The content of the invention
It is an object of the invention to provide a kind of fuel injection characteristic measuring system and measuring method, to ensure measurement in liquid phase stream
Body area is carried out while ensureing the stability for measuring.
For achieving the above object, the solution of the present invention includes：
The nozzle opening arranged in a kind of fuel injection characteristic measuring system, including fuel injector (5), fuel injector (5), with nozzle opening pair
The piezoelectric transducer (6) that should be arranged, piezoelectric transducer connection measurement apparatus, is additionally provided with for recording the fuel injector (5) oil spout
The metering module (4) of time, metering module (4) connect the measurement apparatus, for adjusting the nozzle opening and piezoelectric transducer
The roll-setting gear of distance.
Fuel injection characteristic measuring system also includes a high-pressure oil pump, and high-pressure oil pump connection pumps out combustion to store high-pressure oil pump
Oil the accumulator for making oil pressure stable, the output circuit of accumulator connect the fuel injector.
The roll-setting gear is the roll-setting gear (9) for driving the piezoelectric transducer motion.
The measurement apparatus are terminal (10), and terminal (10) is by harvester (7) the connection meter
Amount module (4) and manometric module (8), the piezoelectric transducer (6) connect the harvester by the manometric module (8)
(7)。
Fuel injection characteristic measuring method, step are as follows：
1) before measuring：Start-stop t interval time of measurement piezo sensor output signal0, and signal output waveform；It is logical
Cross metering module record oil injection duration size T；
2) piezo sensor output signal start-stop interval time and oil injection duration size are compared, if two time not phase
Deng, then drive roll-setting gear to adjust the distance between piezoelectric transducer and nozzle opening, it is equal until two times, and sensor output
Waveform is steady；
3) start measurement.
In measuring system, nozzle opening is correspondingly arranged the present invention with piezoelectric transducer, be increased a roll-setting gear, is used for
Adjust the distance between piezoelectric transducer and nozzle opening.
The present invention：Compare sensor output signal start-stop interval time and oil injection duration size, and drive roll-setting gear
Adjust the distance between sensor and nozzle opening, it is of substantially equal until two times, and sensor output waveform it is most steady when till,
Now sensor position is optimal flow measurement position.
Sensor output signal start-stop interval time is t0, oil injection duration size is T；T0When being defined as with the ratio of T
Between number, with letterRepresent, i.e.,：WithValue may compare
The size of amount.WhenWhen value is equal to 1, represent at the section fuel flow it is equal with fuel flow at nozzle opening (in view of error because
Element, can beValue is relaxed near 1).Now, the flow for measuring oily beam at the section is obtained the flow at nozzle opening.Only
Can just make at oily beam section in liquid phase fluid areaEqual to 1, now, the oily beam between nozzle opening and the section is in liquid to value
Phase region, the flow at nozzle opening, no matter average discharge or instantaneous delivery is equal to the corresponding flow at the section.And
Non-liquid fluid zone in, the average discharge and the average discharge at nozzle opening at oily beam arbitrary section still be in ratio, but both
Instantaneous delivery there is no longer one-to-one relationship.
In theory, whole liquid phase regionValue is equal to 1, and sensor is placed in optional position therebetween, but apart from nozzle opening
Nearer, fuel oil injection is excessively intensive, and speed is also larger, splashes and the phenomenon of collision interference clearly, can cause to pass each other
The signal of sensor output acutely shakes, and measurement result deviates exact value, it is therefore desirable to which selected sensor output waveform is the most stable
Liquid phase zone position.
Description of the drawings
Fig. 1 is the measuring system pie graph of the present invention.
Specific embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
Such as a kind of measuring system that Fig. 1 is the present invention.Including：One is pressurizeed to provide height by the fuel oil of low pressure oil way D
The high-pressure oil pump 1 of compression ignition oil, one is connected to store the storage that high-pressure oil pump pumps out fuel oil and makes oil pressure stable with high-pressure oil pump 1
Depressor 2；One is connected in the output circuit of accumulator 2 to by the oil spout of the high pressure fuel injection in accumulator 2 to downstream
Device 5；One piezoelectric transducer 6 (such as quartz piezoelectric sensor) for being used to accept 5 oil spout beams of fuel injector and measure oily Shu Chongli,
Signal of the signal that piezoelectric transducer 6 is produced by amplifier 8, after being exaggerated is entered in a data acquisition unit 7；One position
To measure the metering device 4 of oil injection duration on fuel injector 5, the metering device 4 is connected to data acquisition unit 7；One use
In the roll-setting gear 9 for adjusting piezoelectric transducer 6 and nozzle opening distance, roll-setting gear 9 is connected with piezoelectric transducer 6.One terminal
Device 10, the termination connect data acquisition unit 7, gather, read and analyze and process signal, and processed, Ke Yijin
Row images outputting.
Roll-setting gear 9 is may be mounted on fuel injector 5, it is also possible on piezoelectric transducer 6.As a kind of embodiment party
Formula, such as Fig. 1, roll-setting gear 9 are connected with piezoelectric transducer 6, and keep vertical with oil spout axially bored line with piezoelectric transducer 6,
Built-in motor and gear, can make piezoelectric transducer 6 slow movable with fine tuning distance.
Nozzle opening has one-to-one relation with piezoelectric transducer, can arrange multigroup nozzle opening and piezoelectric sensing simultaneously
Device, Fig. 1 only depict a nozzle opening and a piezoelectric transducer.Piezoelectric transducer can be fixed in measurement plate, measurement plate
Between nozzle opening and piezoelectric transducer, the mist of oil of ejection is directly born by measurement plate, it is to avoid pollution piezoelectric transducer, also just
In replacing piezoelectric transducer.
2 end of accumulator is also equipped with the pressure tester 3 for measuring input fuel injector fuel pressure, and the pressure tester 3 connects
Data acquisition unit 7, the reference that pressure value is used in measurement process.
Measuring method：
Before formal measurement, first have to determine optimal measurement position.Can by as far as near-earth adjust piezoelectric transducer with
Nozzle opening distance, it is also possible to from the close-by examples to those far off be adjusted.
Such as：Piezoelectric force transducer 6 is placed in into nozzle opening pole nearby first, injection pressure, fuel injection pulsewidth, driving voltage electricity
Stream etc. keeps constant, multi-injection fuel oil, compares sensor output signal start-stop interval time and oil injection duration size, and grasps
Vertical roll-setting gear 9 adjusts the distance between sensor and nozzle opening, of substantially equal until two times, and terminal 10 shows sensor
Till when 6 output waveform is most steady, now sensor position is optimal flow measurement position.
Measurement starts, and high-pressure oil pump 1 starts and pumps out the fuel oil of high oil pressure and enters in accumulator 2, and accumulator 2 is stable to fluctuate
Oil pressure, it is ensured that the injection pressure in fuel injector 5 is constant, 5 commencement of fuel injection of fuel injector, and oily beam impact piezoelectric force transducer 6 is pressurized
Face.During 5 commencement of fuel injection of fuel injector is risen to end of injection, pressure tester 3 is whole to provide instantaneous fuel injection pressure signal, measurement apparatus
4 offer oil spout initial signals provide the signal of instantaneous impulse force, impact initial signal with oil injection duration signal, piezoelectric transducer 6
And duration signal is impacted, these signals are entered in terminal 10, with reference to initial parameter via data acquisition unit 7, can be graphical
Fuel injection characteristic curve of the output fuel injector 5 under the conditions of correspondence oil pressure and oil injection duration etc..
Used as the precondition of measurement, the determination of optimal observation position is particularly significant, is directly connected to the essence of surveyed data
Exactness.Necessary repeatedly oil spout, finely tunes distance, until time number is essentially 1, while the waveform smooth steady the most of sensor output
Can.In addition, often changing the initial condition such as an injection pressure, a suboptimum observation position will be redefined.
The derivation of the instantaneous delivery at sensor compression face.
Assume that the fuel mass on shock transducer surface is δ m, and instantaneous delivery is q in certain section of very short time interval δ tv,
Fuel density is ρ, and oily beam is S with sensor surface contact area, and oily Shu Qianduan speed is v, oily beam shock transducer surface
Impulse force is Ft, crash type (perfectly elastic impact, non-perfect elastic collision, completely inelastic collision) is by collision coefficient k (k models
Enclose for 1～2) decision.
Had according to relevant theorem：
Ftδ t=k δ mv
Obtain the instantaneous delivery of oily beam at sensor compression face：
Known by the conservation of mass,When, the instantaneous delivery q at nozzle opening0With oily beam instantaneous delivery q at sensorvPass
It is to be：
q0=qv
Nozzle opening instantaneous delivery q can then be derived0For：
In the case of known to other conditions, can be by the instantaneous impulse force F of measurementtTo calculate instantaneous delivery q at nozzle opening0, FtWith
Time change, can obtain same time dependent q0, i.e. nozzle opening fuel injection characteristic.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.The base of the present invention
This thinking is above-mentioned basic scheme, and for those of ordinary skill in the art, various changes are designed in teaching of the invention
The model of shape, formula, parameter simultaneously need not spend creative work.It is right without departing from the principles and spirit of the present invention
Change, modification, replacement and the modification that embodiment is carried out is still fallen within protection scope of the present invention.
Claims (5)
1. the nozzle opening arranged on a kind of fuel injection characteristic measuring system, including fuel injector (5), fuel injector (5), it is corresponding with nozzle opening
The piezoelectric transducer (6) of setting, piezoelectric transducer connection measurement apparatus, it is characterised in that be additionally provided with for recording the oil spout
The metering module (4) of device (5) injection time, metering module (4) connect the measurement apparatus, for adjusting the nozzle opening with pressure
The roll-setting gear of electric transducer distance；The piezoelectric transducer is used to provide the signal of instantaneous impulse force, impact initial signal and punching
Hit duration signal；The injection time is oil injection duration；Compare piezo sensor output signal start-stop interval time and institute
State oil injection duration size, if two times are equal, and sensor output waveform it is steady when, be defined as optimal flow measurement position
Put；The measuring system is applied to liquid phase fluid area.
2. a kind of fuel injection characteristic measuring system according to claim 1, it is characterised in that also including a high-pressure oil pump,
High-pressure oil pump connection is to store the accumulator that high-pressure oil pump pumps out fuel oil and makes oil pressure stable, the output circuit connection of accumulator
The fuel injector.
3. a kind of fuel injection characteristic measuring system according to claim 1, it is characterised in that the roll-setting gear is to drive institute
State the roll-setting gear (9) of piezoelectric transducer motion.
4. a kind of fuel injection characteristic measuring system according to claim 1, it is characterised in that the measurement apparatus are computer
Terminal (10), terminal (10) connect the metering module (4) and manometric module (8), the pressure by harvester (7)
Electric transducer (6) connects the harvester (7) by the manometric module (8).
5. the fuel injection characteristic measuring method of measuring system as claimed in claim 1, it is characterised in that step is as follows：
1) before measuring：Start-stop t interval time of measurement piezo sensor output signal0, and signal output waveform；By meter
Amount module record oil injection duration size T；
2) piezo sensor output signal start-stop interval time and oil injection duration size are compared, if two times are unequal,
Roll-setting gear is driven to adjust the distance between piezoelectric transducer and nozzle opening, it is equal until two times, and sensor output waveform
Steadily；
3) start measurement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410248080.2A CN104295425B (en) | 2014-06-05 | 2014-06-05 | Oil injection law measuring system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410248080.2A CN104295425B (en) | 2014-06-05 | 2014-06-05 | Oil injection law measuring system and method |
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| Publication Number | Publication Date |
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| CN104295425A CN104295425A (en) | 2015-01-21 |
| CN104295425B true CN104295425B (en) | 2017-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410248080.2A Active CN104295425B (en) | 2014-06-05 | 2014-06-05 | Oil injection law measuring system and method |
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| CN111828219A (en) * | 2020-06-23 | 2020-10-27 | 江苏大学 | Measuring device and measuring method for oil injection rule of diesel engine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101598091A (en) * | 2009-07-09 | 2009-12-09 | 河南科技大学 | A kind of stabilized voltage fuel injection system |
| CN201554584U (en) * | 2009-11-17 | 2010-08-18 | 武汉钢铁(集团)公司 | Diesel injector fuel injection rate curve measurement control device |
| CN202250538U (en) * | 2011-09-23 | 2012-05-30 | 同济大学 | Multiple-time oil injection rule test and control system of common-rail fuel-supplying injector for |
| CN203879667U (en) * | 2014-06-05 | 2014-10-15 | 河南科技大学 | Measuring system for obtaining fuel injection law |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10249754A1 (en) * | 2002-10-25 | 2004-05-06 | Robert Bosch Gmbh | Method and device for measuring the injection rate of a liquid injection valve |
-
2014
- 2014-06-05 CN CN201410248080.2A patent/CN104295425B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101598091A (en) * | 2009-07-09 | 2009-12-09 | 河南科技大学 | A kind of stabilized voltage fuel injection system |
| CN201554584U (en) * | 2009-11-17 | 2010-08-18 | 武汉钢铁(集团)公司 | Diesel injector fuel injection rate curve measurement control device |
| CN202250538U (en) * | 2011-09-23 | 2012-05-30 | 同济大学 | Multiple-time oil injection rule test and control system of common-rail fuel-supplying injector for |
| CN203879667U (en) * | 2014-06-05 | 2014-10-15 | 河南科技大学 | Measuring system for obtaining fuel injection law |
Non-Patent Citations (1)
| Title |
|---|
| 基于平板式压电力传感器的喷油速率测量装置;杨兆山等;《南昌大学学报（工科版）》;20120630;第34卷(第2期);第156-159页 * |
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