CN109083790A - A kind of injection rate measuring system and method based on Zeuch pressure magnetic method - Google Patents
A kind of injection rate measuring system and method based on Zeuch pressure magnetic method Download PDFInfo
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- CN109083790A CN109083790A CN201811141550.XA CN201811141550A CN109083790A CN 109083790 A CN109083790 A CN 109083790A CN 201811141550 A CN201811141550 A CN 201811141550A CN 109083790 A CN109083790 A CN 109083790A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The invention discloses a kind of distributive value electrical signal collection system and methods based on Zeuch pressure magnetic method, which includes measurement module, fuel injector compression module, cavity compression module and signal post-processing module.Fuel injector compression module and cavity compression module are for loading initial injection pressure and cavity back pressure, pressure signal change curve, signal post-processing module operate by filtering, differential, calibration etc. pressure signal curve being reduced into actual fuel injection rate in measurement module capture cavity after injection process is completed.The present invention designs and machined injection rate measuring instrument, which can effectively detect multi-injection process, repeatability height, be convenient for carrying, and noise is small in use, anti-seismic performance is good.
Description
Technical field
The invention belongs to fuel spray diagnostic fields, and in particular to a kind of injection rate measurement based on Zeuch pressure magnetic method
System and method.
Background technique
The liquid fuel (gasoline, kerosene etc.) of high-energy density is the main combustion of automobile engine and aero-engine
Material, spray process is liquid phase fuel and gas interact and is broken into the process of drop, fuel-oil atmozation quality it is fine or not for
The combustion process for forming high-efficiency low-pollution has vital influence.Engine is under different working conditions for the need of fuel oil
The amount of asking and demand rate are different, therefore the accurate injection rate curve for measuring fuel injector at different conditions burns for optimization
Process has important directive function, while injection rate curve is the important primary condition of engine calculating simulation.
Instantaneous distributive value is converted to other electric signals such as pressure, displacement to obtain injection rate by the indirect method of measurement, it has
There are the advantages such as fast response time, measurement error be small.The long tube method of displacement method, Bosch and Zeuch pressure three kinds of methods of magnetic method are extensive
For acquiring injection rate curve.The inertia force that fuel impingement plunger surface generates is converted into the oil spout of corresponding proportion by displacement method
Amount, and then it is inferred to injection rate curve.But this measurement method wants the cooperation between the plunger bushing and plunger under high-speed motion
It asks very high and equipment maintenance cost is high.The long tube method of Bosch characterizes injection rate using the spread speed of fuel pressure wave, behaviour
Make simplicity, but and measurement accuracy more demanding to duct length is relatively low.
Summary of the invention
In view of defect present in above mentioned existing injection rate measuring instrument, the invention proposes one kind to be based on
Zeuch presses the injection rate measuring system and method for magnetic method principle, to acquire complete oil spout in practical fuel injection processes
Rate curve, it includes that pilot injection, main injection and the multi-injection process sprayed afterwards have good response which, which is directed to,
Effect.
The present invention adopts the following technical scheme that realize:
A kind of injection rate measuring system based on Zeuch pressure magnetic method, including the first fuel tank, the first filter, electronic combustion
Oil pump, high-pressure common rail, fuel injector, pressure gauge, the first ball valve, manual pump, final cleaner, the second fuel tank, needle-valve, the second ball
Valve, pressure sensor, charge amplifier, oscillograph, signal generator and host computer；Wherein,
Injection rate measuring instrument includes fuel injector adaptation briquetting, measuring instrument upper end cover and measuring instrument main body, measuring instrument main body
It is set gradually from the inside to the outside with hollow cavity open at one end, on the end face of open end on fuel injector adaptation briquetting and measuring instrument
End cap, fuel injector be arranged in fuel injector adaptation briquetting center at, pressure sensor be arranged in measuring instrument main body wall and with
Hollow cavity connection；
The oil outlet of first fuel tank is connected to the oil inlet of electric fuel punp by the first filter, and electric fuel punp goes out
Hydraulic fluid port is divided into two-way, is connected to the oil return opening of the first fuel tank all the way, and another way is connected to the oil inlet of high-pressure common rail, high-pressure common rail
Oil outlet be connected to the oil inlet of fuel injector；
The oil outlet of second fuel tank passes sequentially through final cleaner, manual pump, the first ball valve and pressure gauge and is connected to measurement
The oil inlet of instrument main body, the oil outlet of measuring instrument main body passes sequentially through the second ball valve and needle-valve is connected to the oil return of the second fuel tank
Mouthful；
The output end of pressure sensor is connected to the input terminal of oscillograph by charge amplifier, and the output end of oscillograph connects
It is connected to the input terminal of host computer, the output end of host computer is connected to the input terminal of signal generator, the output end of signal generator
It is connected to the control terminal for being respectively connected to electric fuel punp, high-pressure common rail and fuel injector.
A further improvement of the present invention lies in that the first fuel tank and the second fuel tank are in closing cuboid.
A further improvement of the present invention lies in that the first filter uses refined filtration type diesel-oil filter element.
A further improvement of the present invention lies in that final cleaner uses metal screen type filter core.
A further improvement of the present invention lies in that electric fuel punp is driven using threephase asynchronous machine.
A further improvement of the present invention lies in that manual pump uses rotary plunger manual pump.
A further improvement of the present invention lies in that be additionally provided between measuring instrument upper end cover and measuring instrument main body red copper gasket and
Fluororubber O-type ring.
A kind of injection rate measurement method based on Zeuch pressure magnetic method, this method are based on above-mentioned a kind of based on Zeuch pressure magnetic
The injection rate measuring system of method, comprising the following steps:
The first step completes the calibration process of measuring instrument volume V, the specific steps are as follows: measuring instrument is integrally assembled to complete, pass
The second ball valve and needle-valve are closed, the first ball valve is opened, full fuel oil will be pumped in cavity using manual pump；Be then shut off the first ball valve,
The second ball valve and needle-valve are opened, the amount of fuel revealed from container is measured；Measuring instrument is disassembled to come, utilizes injector for medical purpose
Remaining fuel oil in undischarged fuel oil and pipeline is drawn in cavity, the fuel oil total amount of above-mentioned leakage is included in；Above procedure is repeated,
Take the arithmetic mean of instantaneous value of practical fuel oil total amount as measuring instrument volume V；
Second step, setting injection pressure place an order the calibration process of time distributive value, and fuel injector is loaded onto experiment setting first
Injection pressure, collect the total of at least 100 repetition oil spouts with the internal graduated cylinder embedded with degreasing cotton in the case where setting injection pressure
Distributive value obtains the distributive value Δ V and density p of single injection event process using high Accuracy Electronic Balance measurement conversion；
Third step assembles measuring instrument main body, connects associated ping and starts cavity compression module, will be fired using manual pump
Oil is pumped into measuring instrument main body by final cleaner, the first ball valve by the second fuel tank, and the registration to pressure gauge is higher than local atmosphere
After pressure, measuring instrument body interior has been filled with fuel oil to be measured at this time, closes the first ball valve, opens the second ball valve and needle-valve, holds
Intracavitary residual air can take the lead in that cavity is discharged, and continue that above-mentioned pressurization pressure discharge operations are repeated to cavity, until empty inside cavity
Gas drains completely, and fuel oil in cavity is finally loaded onto preset pressure using manual pump；
4th step carries out fuel injection operations, and the specific steps are starting fuel injector compression modules, by adjusting electric fuel oil
The duty ratio control for pumping proportioning valve enters the amount of fuel of plunger cavity, so that high-pressure common rail fuel pressure stabilization is attached in preset pressure
Closely, and the first ball valve and the second ball valve are closed, checks whether cavity back pressure is loaded onto setting pressure, whether check fuel injector pressure
It is loaded onto setting pressure, above-mentioned pressure is no more than ± the 1% of pressure set points, is occurred according to preset injection conditions by signal
Device, which transmits driving signal to fuel injector, completes fuel injection operations；
5th step captures pressure signal curve in cavity, before acquiring electric pressure signal, sets and acquires to charge amplifier
Parameter, pressure sensor generate faint current signal based on piezoelectric effect and are transmitted to charge amplifier, by ratio enlargement, low
Frequency filtering and Current Voltage conversion operation are captured in the form of voltage signal and be shown in oscillograph screen by oscillographs, are believed
Signal generator is passed into the driving signal of fuel injector as trigger signal, with the rising edge of voltage signal in number collection process
For signal starting point collection voltages signal waveform；
6th step, the post-processing step of waveform voltage signal, the setup parameter for adjusting oscillograph are complete by waveform voltage signal
Whether site preparation is shown on oscillograph, correct come preliminary judgment curves waveform according to the initial set value of pulsewidth, if there is reality
Experiment under the operating condition is repeated once for confirmation by the obvious situation bigger than normal or less than normal of border pulsewidth；It is checked to voltage curve errorless
Later, curve data is delivered to host computer by transmission medium, debugging is voluntarily write using built in host computer to curve
Savitzky-Golay convolution smoothing algorithm and first differential derivative algorithms carry out smoothing filtering operation and first derivation to curve
Operation obtains voltage waveform and voltage derivative waveform that postprocessing correction is crossed respectively；
7th step, actual volume elastic modulus EVCalibration process, first by the 5th step by filtering and derivation processing
Amplification factor of the voltage waveform according to charge amplifier, the sensitivity of Current Voltage conversion coefficient and piezoelectric pressure indicator
Coefficient is reduced into the pressure curve waveform in practical cavity, and according to the vessel volume V of first step measurement, second step is measured identical
Injection pressure places an order time distributive value Δ V, and the ascensional range Δ P measured on pressure curve out of practical cavity, more than it
Three parameters substitute into formula (1), just obtain the bulk modulus numerical value E of real time monitoring under identical environmentV；
8th step, the calibration process of actual fuel injection rate Δ V/ Δ t, first by the 5th step obtain voltage derivative waveform according to
According to the amplification factor of charge amplifier, the sensitivity coefficient of Current Voltage conversion coefficient and pressure sensor is reduced into practical appearance
Intracavitary pressure curve derivative wave-form Δ P/ Δ t, according to the vessel volume V of first step measurement, the actual volume of the 6th step calibration
Elastic modulus EV, pressure curve derivative Δ P/ Δ t is substituted into formula (2) and just obtains actual fuel injection rate Δ V/ Δ t；If with quality
The actual fuel injection rate that manifold formula Δ M/ Δ t is indicated, by Δ V/ Δ t is indicated in the form of volume flow pressure curve multiplied by second step
The fuel density ρ calibrated；
9th step, pressure release pressurized operation and instrument maintenance method after single injection event are beaten after the completion of single injection event experiment
Surplus liquid in the second ball valve and needle-valve emptying cavity is opened, the second ball valve and needle-valve is closed after liquid is discharged, opens the first ball valve
And cavity pressure will be held with manual pump again and be loaded onto initial pressure in case spray next time.
Compared with prior art, the invention has the following beneficial technical effects:
The present invention illustrates a kind of test macro that can accurately measure fuel injection rate curve under different operating conditions,
And design and machined injection rate measuring instrument, which has repeatability height, and it is small in size, the features such as being convenient for carrying, and
Noise is small in use, anti-seismic performance is good.
Fuel injector part design of the invention has adapter, and it is suitable can to design processing according to practical fuel injector structure to be measured
Orchestration outer dimension and sealing means.Due to not needing to significantly alter the main structure of measuring instrument, can with save the cost, and
And guarantee that cavity volume does not change with fuel injector and changed.
Measuring system fuel feeding part (fuel injector compression module and cavity compression module) of the invention is in oil pump inlet
Preceding installation fuel oil filtering device ensure that the cleannes of the fuel oil before entering measuring instrument, can prevent oil nozzle plug, extend equipment
Service life.
Pipeline valve connection in test macro of the present invention is all made of bite type connection and conical surface seal mode, improves pipeline
The reliability of connection is conducive to the disassembly and replacement of components.Measuring instrument and piping material select 316 stainless steels, can be applicable in
In the acid-base property fluid of weak corrosion.
Present invention design has special chilled(cooling) water return (CWR) for the first fuel tank, due to electric fuel punp inner plunger high-frequency compression
Fuel oil causes fuel oil temperature to increase, and the first liquid level of fuel oil in fuel tank can be maintained steady temperature by chilled(cooling) water return (CWR), to reduce combustion
Oil temperature rises the influence measured injection rate.
Pressure curve is smoothly filtered using Savitzky-Golay convolution smoothing algorithm in post-processing module of the present invention
Wave processing, can eliminate the Periodic thermal forcing of measuring system in experimentation.
Post-processing module of the present invention obtains pressure song to pressure curve processing using variable step size first differential derivative algorithms
Linear change rate can carry out adjusting step optimization pressure change rate curve according to specific operating condition such as pulsewidth, the parameters such as injection interval.
Bulk modulus E of the inventionVCalibration process using fuel injection amount combination container reality under actual condition
The mode of volume eliminates measurement environment and type of fuel to calibration result using the real-time accurate calibration of incompressible flow bulk properties
Influence.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of injection rate measuring system of the present invention.
Fig. 2 is that injection rate measuring instrument of the present invention assembles explosive view.
Description of symbols: the first fuel tank of 1-, the first filter of 2-, 3- electric fuel punp, 4- high-pressure common rail, 5- oil spout
Device, 6- fuel injector are adapted to briquetting, 7- measuring instrument upper end cover, 8- pressure gauge, the first ball valve of 9-, 10- manual pump, the second filtering of 11-
Device, the second fuel tank of 12-, 13- needle-valve, the second ball valve of 14-, 15- measuring instrument main body, 16- pressure sensor, 17- charge amplifier,
18- oscillograph, 19- signal generator, 20- host computer.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings.
As depicted in figs. 1 and 2, the present invention provides a kind of injection rate measuring system based on Zeuch pressure magnetic method principle, uses
In injection rate curve of the accurate measurement under different operating conditions, and there is good response to the different phase of multi-injection process
Effect.The system cover the generation of fuel injector injection process, the acquisition of the electric pressure signal due to caused by oil spout in cavity,
The conversion process of the amplification of electric pressure signal and voltage and current, electric pressure signal is filtered using post-processing approach and
Derivation operation and according to experimental system parameter to electric pressure signal carry out calibration be reduced into fuel injection signal complete test stream
Journey.
Main functional modules of the present invention include injection rate measuring instrument, fuel injector compression module, cavity compression module, pressure release
Protective module, pressure signal acquisition module and signal post-processing module.Wherein injection rate measuring instrument is a whole set of measuring system
Main part, injection process is triggered by being mounted on the fuel injector 5 at the top of measuring instrument, and the pressure sensor 16 by being connected to cavity
Pressure oscillation in cavity is transferred to pressure signal acquisition module；Fuel injector compression module uses 4 electric injection system of high-pressure common rail simultaneously
Cooperate negative-feedback regu- lation mechanism to supply to fuel injector 5 and stablizes oil pressure；Cavity compression module is by rotary plunger type manual pump 10 and valve
Door pipeline is constituted, to supply specified initial pressure into test cavity；Decompression protection module is by the second ball valve 14 and high-precision
Needle-valve 13 is constituted, and pressure signal in cavity can be adjusted to specified initial pressure and is used to carry out repeated experiment；Pressure signal
Pressure change small in cavity is pressed sensor sensitivity factor equal proportion using piezoelectric pressure indicator 16 by acquisition module
It is converted to capacitor load current, linear scale is carried out by charge amplifier 17 and is amplified and converted to voltage signal；After signal
Processing module is made of oscillograph 18 and slave computer PC, to the voltage-time curve recorded from oscillograph 18 in slave computer
Carried out on 20 Savitzky-Golay filtering and to the time using the derivation of variable step size first differential can obtain it is repeated high, can
The pressure curve waveform good by property, and then pressure curve waveform can be reduced into corresponding injection rate song by standardization experimental apparatus
Line.
The present invention sprays into fuel oil into a closed rigid container full of fuel oil by fuel injector, according to fuel oil can not
Contraction principle can be risen with pressure in containers for pushing out and spray into proportional between amount of fuel, and then be obtained by pressure sensor
Obtain pressure history, so that it may obtain distributive value and injection rate.Assuming that closed rigid container volume is V, fuel oil is sprayed into
Volume is Δ V, and fuel bulk elasticity modulus is EV, pressure rising amplitude is Δ P in closed container, then between each physical quantity
Quantitative relation can be characterized with following equation:
Negative sign in formula indicates the rising that will lead to pressure when volume reduces, by measuring pressure rising amplitude Δ P, knot
Close fuel bulk elastic modulus E under practical cavity volume V and experiment conditionVDistributive value Δ V can be obtained.
It is different by testing tested fuel oil usually based on the hydrocarbon mixtures such as gasoline, kerosene and diesel oil
Provenance and processing technology can bring uncertain influence to the physicochemical properties of the above fuel oil mixture.It is practical
Fuel bulk elastic modulus EVAs its basic physical property by many factors such as type of fuel, pressure, temperature, air contents
It influences, thus it is more difficult by checking physical property table or professional measuring mechanism being entrusted to measure accurate fuel bulk elasticity modulus number in advance
Value.The present invention captures accurate bulk modulus numerical value by the way of the real time monitoring under identical environment, can be with
Reach reduction systematic error simultaneously, reduces the purpose of experimental cost.
It needs to ask under first derivative acquisition the time (1) formula the right and left to obtain the injection rate of injection system
Formula:
The injection rate measured needed for dV/dt is exactly in above-mentioned expression formula obtains container fuel pressure rate of rise dP/
Dt, fuel bulk elastic modulus EVAnd closed container volume V can obtain injection rate by formula (2).
Specifically, the present invention includes with lower component: the first fuel tank 1, the first filter 2, electric fuel punp 3, high pressure are total
Rail 4, fuel injector 5, fuel injector are adapted to briquetting 6, measuring instrument upper end cover 7, pressure gauge 8, the first ball valve 9, manual pump 10, the second filtering
Device 11, the second fuel tank 12, needle-valve 13, the second ball valve 14, measuring instrument main body 15, pressure sensor 16, charge amplifier 17, oscillography
Device 18, signal generator 19 and host computer 20.
The first fuel tank 1 and the second fuel tank 12 are respectively Experimental Flowing Object reserve tank in the present invention, for providing to experimental system
Sufficient stable test fuel, two kinds of fuel tanks due to the scope of application is close can be with cross-reference.Fuel tank takes totally enclosed structure,
Therefore it is aided with corresponding pressurized liquefied measure and is applicable to such as dimethyl ether, the stronger liquid of diethyl ether volatility.
The present invention uses two distinct types of filter, and the first filter 2 selects diesel-oil filter element to pressurize for fuel injector
Module, the filter core can guarantee that atomizer is not in clogging and is convenient for changing measuring system during the work time；Second filter
Clear device 11 is used for cavity compression module using metal screen type filter core, and pump oil efficiency can be improved and reuse.
The present invention carries out pressurized operation to fuel injector compression module and cavity compression module respectively using different fuel system.
Fuel injector compression module makes 4 internal combustion oil pressure of high-pressure common rail using the duty ratio of negative-feedback PID control policy control electric fuel punp 3
Power is stablized near preset pressure；Cavity compression module utilizes the appearance in rotary plunger manual pump 10 load measuring instrument main body 15
Chamber back pressure, slower pump oil rate are conducive to keep initial pressure stable in cavity, avoid biggish pressure oscillation in cavity.
Measurement main part of the invention is injection rate measuring instrument, is adapted to briquetting 6, measuring instrument upper end cover 7 by fuel injector
And measuring instrument main body 15 forms.Wherein fuel injector adaptation briquetting 6 can according to the outer dimension of practical tested fuel injector into
Row design processing；15 upper surface of measuring instrument main body is machined with endless groove, and measuring instrument upper end cover 7 utilizes fluororubber O-type ring and measurement
Instrument main body 15 constitutes reliable packing seal.15 pedestal of measuring instrument main body is fixed on experimental standard optical platform, reduces system
Interference of the system vibration to pressure curve.Pressure sensor 16, pressure gauge 8 and the second ball valve 14 are uniformly mounted on measuring instrument main body
15 four different directions.
Pressure signal acquisition module of the invention is by piezoelectric pressure indicator 16, charge amplifier 17, oscillograph 18, letter
Number generator 19 forms.Wherein signal generator 19 be fuel injector compression module control axis, be responsible for electric fuel punp 3,
High-pressure common rail 4 and the output control signal of fuel injector 5, and according to the real-time negative feedback Signal Regulation electric fuel oil of pressure in common rail
The pump oil frequency of pump and then the stabilization for keeping pressure in common rail.The injection process of fuel injector 5 by internal magnet exciting coil, armature and
Its internal needle-valve is completed jointly.Come automatic signal generator 19 fuel injection signal make magnet exciting coil be powered and band be magnetic, attract rank
Iron simultaneously drives its internal needle-valve to far from the movement of spray orifice direction, and fuel injector internal high pressure fuel oil is just quickly sprayed by spray orifice at this time
Out.Oscillograph 18 receives the pressure signal curve exported from piezoelectric pressure indicator 16, will be electric by charge amplifier 17
Lotus signal is amplified by proper ratio and is converted to voltage signal.
Signal post-processing module of the invention is made of oscillograph 18 and host computer 20.Electricity from charge amplifier 17
Pressure signal is captured by oscillograph 18, digital-to-analogue conversion is carried out to voltage signal according to suitable sample frequency, finally with the shape of text
Formula store and is transferred to host computer 20 by storage medium.Host computer 20 is built-in with flat based on Savitzky-Golay convolution
Sliding algorithm voluntarily writes the executable software of debugging, can carry out smoothing filtering operation to pressure curve, improve the smooth of waveform
Property, reduce the interference of noise.Host computer is built-in with the executable software that debugging is voluntarily write based on first differential derivative algorithms, can
To choose suitable differential step size, differential derivation operations are carried out to the pressure curve after filtering, obtain the single order of pressure curve
Differential signal.
A kind of injection rate measurement method based on Zeuch pressure magnetic method principle provided by the invention, including the following contents:
The first step that the present invention tests is to complete the calibration process of measuring instrument volume V, the specific steps are as follows: measuring instrument is whole
Body assembly is complete, closes the second ball valve 14 and needle-valve 13, opens the first ball valve 9, and full combustion will be pumped in cavity using manual pump 10
Oil.It is then shut off the first ball valve 9, opens the second ball valve 14 and needle-valve 13, measure the amount of fuel revealed from container.It will measurement
Instrument, which disassembles, to be come, and using remaining fuel oil in undischarged fuel oil in injector for medical purpose absorption cavity and pipeline, is included in above-mentioned let out
The fuel oil total amount of dew.It repeats above procedure 10 times, takes the arithmetic mean of instantaneous value of practical fuel oil total amount as measuring instrument volume V；
The second step that the present invention tests is that setting injection pressure places an order the calibration process of time distributive value, is needed first by fuel injector
5 are loaded onto the injection pressure of experiment setting, collect at least 100 with the internal graduated cylinder embedded with degreasing cotton in the case where setting injection pressure
The secondary total fuel injection quantity for repeating oil spout obtains single injection event mistake using high Accuracy Electronic Balance (full accuracy 0.1mg) measurement conversion
The distributive value Δ V and density p of journey.
The third step that the present invention tests is to assemble measuring instrument main body 15, connects associated ping and starts cavity compression molding
Fuel oil is pumped into measurement by final cleaner 11, the first ball valve 9 by the second fuel tank 12 using rotary plunger manual pump 10 by block
Instrument main body 15.Registration to pressure gauge 8 is higher than after local atmospheric pressure, and measuring instrument body interior has been filled with fuel oil to be measured at this time,
The first ball valve 9 is closed, the second ball valve 14 and needle-valve 13 are opened, residual air can take the lead in that cavity is discharged in cavity.Continue to appearance
Above-mentioned pressurization pressure discharge operations are repeated in chamber, until cavity inner air drains completely, finally utilize manual pump by cavity internal combustion
Oil is loaded onto preset pressure.
The 4th step that the present invention tests is to carry out fuel injection operations, and the specific steps are starting fuel injector compression modules, is led to
The duty ratio control for overregulating 3 proportioning valve of electric fuel punp enters the amount of fuel of plunger cavity, so that 4 fuel pressure of high-pressure common rail
Stablize near preset pressure, and closes the first ball valve 9 and the second ball valve 14.Check whether cavity back pressure is loaded onto setting pressure
Power, checks whether fuel injector pressure is loaded onto setting pressure, and above-mentioned pressure should not be more than ± the 1% of pressure set points.Root
Driving signal is transmitted to fuel injector 5 by signal generator 17 according to preset injection conditions (such as fuel injection pulsewidth, multi-injection interval)
Complete fuel injection operations.After each course of injection terminates, the negative-feedback regu- lation mechanism of oil pump can in a very short period of time certainly
The dynamic amount of fuel for entering high-pressure common rail that increases is to maintain preset pressure.Since electrical plunger pump pumping ability is strong in experimentation,
Fuel oil calorific value is larger, therefore the first fuel tank 1 eliminates the raising of temperature caused by ram compression fuel oil equipped with chilled(cooling) water return (CWR)
Influence to fuel oil physical property.
The 5th step that the present invention tests is pressure signal curve in capture cavity.It, need to be to electricity before acquiring electric pressure signal
Lotus amplifier 17 sets suitable acquisition parameter (range, sensitivity coefficient, band logical frequency and the times magnification of such as charge amplifier
Number etc.).Piezoelectric transducer generates faint current signal based on piezoelectric effect and is transmitted to charge amplifier 17, puts by ratio
Greatly, the operation such as low frequency filtering and Current Voltage conversion is captured in the form of voltage signal by oscillograph 18 and is shown in oscillograph
On screen.Signal generator 19 is passed into the driving signal of fuel injector 5 as trigger signal, with voltage in signal acquisition process
The rising edge of signal is signal starting point collection voltages signal waveform.
The 6th step that the present invention tests is the post-processing step of waveform voltage signal.The setup parameter for adjusting oscillograph 18 will
Waveform voltage signal is more completely shown on oscillograph, according to the initial set value of pulsewidth come preliminary judgment curves waveform whether just
Really, it if there is the obvious situation bigger than normal or less than normal of practical pulsewidth, needs for experiment under the operating condition to be repeated once for confirmation.To
After voltage curve inspection is errorless, curve data is delivered to host computer 20 by transmission medium, host computer 20 is utilized to curve
The built-in Savitzky-Golay convolution smoothing algorithm for voluntarily writing debugging and first differential derivative algorithms carries out curve flat
Sliding filtering operation and first derivation operation obtain voltage waveform and voltage derivative waveform that postprocessing correction is crossed respectively.
The 7th step that the present invention tests is actual volume elastic modulus EVCalibration process.First by the 5th step by filtering
With the amplification factor of the voltage waveform foundation charge amplifier 17 of derivation processing, Current Voltage conversion coefficient and piezoelectric pressure
The parameters such as the sensitivity coefficient of sensor 16 are reduced into the pressure curve waveform in practical cavity.Container according to first step measurement
Volume V, the identical injection pressure of second step measurement place an order time distributive value Δ V, and measure on pressure curve out of practical cavity
Ascensional range Δ P, by its three above parameter substitute into formula (1), the body of real time monitoring under identical environment can be obtained
Product elasticity modulus numerical value EV。
The 8th step that the present invention tests is the calibration process of actual fuel injection rate Δ V/ Δ t.The 5th step is obtained first
The amplification factor of voltage derivative waveform reference charge amplifier 17, Current Voltage conversion coefficient and piezoelectric pressure indicator 16
The parameters such as sensitivity coefficient be reduced into the pressure curve derivative wave-form Δ P/ Δ t in practical cavity.According to first step measurement
Vessel volume V, the actual volume elastic modulus E of the 6th step calibrationV, pressure curve derivative Δ P/ Δ t is substituted into formula (2)
Obtain actual fuel injection rate Δ V/ Δ t.If necessary to the actual fuel injection rate indicated with mass flow Δ M/ Δ t, it is only necessary to
The fuel density ρ that the pressure curve that Δ V/ Δ t is indicated in the form of volume flow is calibrated multiplied by second step.
The 9th step that the present invention tests is pressure release pressurized operation and instrument maintenance method after single injection event.To single injection event
It needs to open the second ball valve 14 after the completion of experiment and needle-valve 13 empties surplus liquid in cavity, need to close the second ball valve after liquid is discharged
14 and needle-valve 13, it opens the first ball valve 9 and cavity pressure will be held with manual pump 10 again and be loaded onto initial pressure in case of next time
Injection.After all experimental implementations are completed, measuring instrument assembly need to be disassembled and, it is then organic molten with acetone or alcohol etc.
Agent soaks and cleans cavity inner wall and connecting line, and accelerates the volatilization process of acetone and other organic solvent using nitrogen stream.
Claims (8)
1. a kind of injection rate measuring system based on Zeuch pressure magnetic method, which is characterized in that including the first fuel tank (1), the first filter
Clear device (2), electric fuel punp (3), high-pressure common rail (4), fuel injector (5), pressure gauge (8), the first ball valve (9), manual pump (10),
Final cleaner (11), the second fuel tank (12), needle-valve (13), the second ball valve (14), pressure sensor (16), charge amplifier
(17), oscillograph (18), signal generator (19) and host computer (20)；Wherein,
Injection rate measuring instrument includes fuel injector adaptation briquetting (6), measuring instrument upper end cover (7) and measuring instrument main body (15), measurement
Instrument main body (15) has hollow cavity open at one end, sets gradually fuel injector adaptation briquetting on the end face of open end from the inside to the outside
(6) it is arranged at the center of fuel injector adaptation briquetting (6) with measuring instrument upper end cover (7), fuel injector (5), pressure sensor (16)
It is arranged on measuring instrument main body (15) side wall and is connected to hollow cavity；
The oil outlet of first fuel tank (1) is connected to the oil inlet of electric fuel punp (3), electric fuel oil by the first filter (2)
The oil outlet of pump (3) is divided into two-way, is connected to the oil return opening of the first fuel tank (1) all the way, another way is connected to high-pressure common rail (4)
The oil outlet of oil inlet, high-pressure common rail (4) is connected to the oil inlet of fuel injector (5)；
The oil outlet of second fuel tank (12) passes sequentially through final cleaner (11), manual pump (10), the first ball valve (9) and pressure gauge
(8) be connected to the oil inlet of measuring instrument main body (15), the oil outlet of measuring instrument main body (15) pass sequentially through the second ball valve (14) and
Needle-valve (13) is connected to the oil return opening of the second fuel tank (12)；
The output end of pressure sensor (16) is connected to the input terminal of oscillograph (18), oscillograph by charge amplifier (17)
(18) output end is connected to the input terminal of host computer (20), and the output end of host computer (20) is connected to signal generator (19)
Input terminal, the output end of signal generator (19), which is connected to, is respectively connected to electric fuel punp (3), high-pressure common rail (4) and oil spout
The control terminal of device (5).
2. a kind of injection rate measuring system based on Zeuch pressure magnetic method according to claim 1, which is characterized in that the
One fuel tank (1) and the second fuel tank (12) are in closing cuboid.
3. a kind of injection rate measuring system based on Zeuch pressure magnetic method according to claim 1, which is characterized in that the
One filter (2) uses refined filtration type diesel-oil filter element.
4. a kind of injection rate measuring system based on Zeuch pressure magnetic method according to claim 1, which is characterized in that the
Two filters (11) use metal screen type filter core.
5. a kind of injection rate measuring system based on Zeuch pressure magnetic method according to claim 1, which is characterized in that electricity
Dynamic fuel pump (3) are driven using threephase asynchronous machine.
6. a kind of injection rate measuring system based on Zeuch pressure magnetic method according to claim 1, which is characterized in that hand
Dynamic pump (10) uses rotary plunger manual pump.
7. a kind of injection rate measuring system based on Zeuch pressure magnetic method according to claim 1, which is characterized in that survey
Red copper gasket and fluororubber O-type ring are additionally provided between amount instrument upper end cover (7) and measuring instrument main body (15).
8. a kind of injection rate measurement method based on Zeuch pressure magnetic method, which is characterized in that this method is based on claim 1 to 7
Any one of described in it is a kind of based on Zeuch pressure magnetic method injection rate measuring system, comprising the following steps:
The first step completes the calibration process of measuring instrument volume V, the specific steps are as follows: measuring instrument integrally assemble to complete, closing the
Two ball valves (14) and needle-valve (13) are opened the first ball valve (9), and full fuel oil will be pumped in cavity using manual pump (10)；Then it closes
It closes the first ball valve (9), open the second ball valve (14) and needle-valve (13), measure the amount of fuel revealed from container；By measuring instrument
It disassembles and, using remaining fuel oil in undischarged fuel oil in injector for medical purpose absorption cavity and pipeline, be included in above-mentioned leakage
Fuel oil total amount；Above procedure is repeated, takes the arithmetic mean of instantaneous value of practical fuel oil total amount as measuring instrument volume V；
Second step, setting injection pressure place an order the calibration process of time distributive value, and fuel injector (5) is loaded onto experiment setting first
Injection pressure collects total spray of at least 100 repetition oil spouts in the case where setting injection pressure with the internal graduated cylinder embedded with degreasing cotton
Oil mass obtains the distributive value Δ V and density p of single injection event process using high Accuracy Electronic Balance measurement conversion；
Third step assembles measuring instrument main body (15), connects associated ping and starts cavity compression module, utilizes manual pump (10)
Fuel oil is pumped into measuring instrument main body (15) by final cleaner (11), the first ball valve (9) by the second fuel tank (12), to pressure gauge
(8) registration is higher than after local atmospheric pressure, has been filled with fuel oil to be measured inside measuring instrument main body (15) at this time, closes the first ball valve
(9), the second ball valve (14) and needle-valve (13) are opened, residual air can take the lead in that cavity is discharged in cavity, continue to cavity repeatedly
Above-mentioned pressurization pressure discharge operations are carried out, until cavity inner air drains completely, finally utilize manual pump (10) by fuel oil in cavity
It is loaded onto preset pressure；
4th step carries out fuel injection operations, and the specific steps are starting fuel injector compression modules, by adjusting electric fuel punp
(3) the duty ratio control of proportioning valve enters the amount of fuel of plunger cavity, so that high-pressure common rail (4) fuel pressure is stablized in default pressure
Near power, and the first ball valve (9) and the second ball valve (14) are closed, check whether cavity back pressure is loaded onto setting pressure, checks spray
Whether oily device pressure is loaded onto setting pressure, and above-mentioned pressure is no more than ± the 1% of pressure set points, according to preset jet strip
Part, which transmits driving signal to fuel injector (5) by signal generator (17), completes fuel injection operations；
5th step captures pressure signal curve in cavity, before acquiring electric pressure signal, gives charge amplifier (17) setting acquisition
Parameter, pressure sensor (16) generate faint current signal based on piezoelectric effect and are transmitted to charge amplifier (17), by than
Example amplification, low frequency filtering and Current Voltage conversion operation are captured and are shown in the form of voltage signal by oscillograph (18) and shown
On wave device (18) screen, signal generator (19) is passed into the driving signal of fuel injector (5) as touching in signal acquisition process
It signals, using the rising edge of voltage signal as signal starting point collection voltages signal waveform；
6th step, the post-processing step of waveform voltage signal, the setup parameter for adjusting oscillograph (18) are complete by waveform voltage signal
Whether site preparation is shown on oscillograph (18), correct come preliminary judgment curves waveform according to the initial set value of pulsewidth, if gone out
Experiment under the operating condition is repeated once for confirmation by the obvious situation bigger than normal or less than normal of real border pulsewidth；To voltage curve inspection
After errorless, curve data is delivered to host computer (20) by transmission medium, oneself built in host computer (20) is utilized to curve
Row writes the Savitzky-Golay convolution smoothing algorithm of debugging and first differential derivative algorithms carry out smothing filtering behaviour to curve
Make and first derivation operates, obtains voltage waveform and voltage derivative waveform that postprocessing correction is crossed respectively；
7th step, actual volume elastic modulus EVCalibration process, first by the 5th step by filtering and derivation processing voltage wave
Amplification factor of the shape according to charge amplifier (17), Current Voltage conversion coefficient and piezoelectric pressure indicator (16) it is sensitive
Degree coefficient is reduced into the pressure curve waveform in practical cavity, according to the vessel volume V of first step measurement, the phase of second step measurement
Place an order time distributive value Δ V, and the ascensional range Δ P measured on pressure curve out of practical cavity with injection pressure, by its with
Upper three parameters substitute into formula (1), just obtain the bulk modulus numerical value E of real time monitoring under identical environmentV；
8th step, the calibration process of actual fuel injection rate Δ V/ Δ t, the voltage derivative waveform reference electricity for first obtaining the 5th step
The sensitivity coefficient of the amplification factor of lotus amplifier (17), Current Voltage conversion coefficient and pressure sensor (16) is reduced into reality
Pressure curve derivative wave-form Δ P/ Δ t in the cavity of border, according to the vessel volume V of first step measurement, the reality of the 6th step calibration
Bulk modulus EV, pressure curve derivative Δ P/ Δ t is substituted into formula (2) and just obtains actual fuel injection rate Δ V/ Δ t；If with
The actual fuel injection rate that mass flow Δ M/ Δ t is indicated, by Δ V/ Δ t is indicated in the form of volume flow pressure curve multiplied by the
The fuel density ρ that two steps calibrate；
9th step, pressure release pressurized operation and instrument maintenance method after single injection event open the after the completion of single injection event experiment
Surplus liquid in two ball valves (14) and needle-valve (13) emptying cavity, closes the second ball valve (14) and needle-valve (13) after liquid is discharged,
It opens the first ball valve (9) and cavity pressure will be held with manual pump (10) again and be loaded onto initial pressure in case spray next time.
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| CN110082253A (en) * | 2019-04-24 | 2019-08-02 | 北京工业大学 | A method of fuel density is identified according to pressure wave periodic on-line |
| CN110261261A (en) * | 2019-06-28 | 2019-09-20 | 潍柴动力股份有限公司 | Generating sets method and device thereof and related application method, apparatus |
| CN111042969A (en) * | 2019-12-10 | 2020-04-21 | 西安交通大学 | Test device for measuring flash boiling spray |
| CN111946519A (en) * | 2020-08-07 | 2020-11-17 | 哈尔滨工程大学 | Oil injection rule testing device based on ringing method sound velocity correction |
| CN112683853A (en) * | 2020-10-29 | 2021-04-20 | 西安交通大学 | Quantitative test system for liquid phase fuel equivalence ratio of spray section |
| CN113565659A (en) * | 2021-07-20 | 2021-10-29 | 河北华北柴油机有限责任公司 | Reliability assessment method for manual fuel pump |
| CN114483301A (en) * | 2021-12-09 | 2022-05-13 | 西安交通大学 | Simple gas engine jet law measuring system and method |
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| CN111042969A (en) * | 2019-12-10 | 2020-04-21 | 西安交通大学 | Test device for measuring flash boiling spray |
| CN111946519A (en) * | 2020-08-07 | 2020-11-17 | 哈尔滨工程大学 | Oil injection rule testing device based on ringing method sound velocity correction |
| CN112683853A (en) * | 2020-10-29 | 2021-04-20 | 西安交通大学 | Quantitative test system for liquid phase fuel equivalence ratio of spray section |
| CN112683853B (en) * | 2020-10-29 | 2021-11-19 | 西安交通大学 | Quantitative test system for liquid phase fuel equivalence ratio of spray section |
| CN113565659A (en) * | 2021-07-20 | 2021-10-29 | 河北华北柴油机有限责任公司 | Reliability assessment method for manual fuel pump |
| CN114483301A (en) * | 2021-12-09 | 2022-05-13 | 西安交通大学 | Simple gas engine jet law measuring system and method |
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