CN109139323A - A kind of combined type fuel injection camshaft phase and fuel feeding timing detection device and method - Google Patents
A kind of combined type fuel injection camshaft phase and fuel feeding timing detection device and method Download PDFInfo
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- CN109139323A CN109139323A CN201811316276.5A CN201811316276A CN109139323A CN 109139323 A CN109139323 A CN 109139323A CN 201811316276 A CN201811316276 A CN 201811316276A CN 109139323 A CN109139323 A CN 109139323A
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- pressure oil
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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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- 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
- F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
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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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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Testing Of Engines (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
本发明属于柴油机测试技术领域，提出一种用于油泵试验台检测复合喷油泵凸轮轴相位及供油时刻的装置及方法。提出的一种用于油泵试验台检测复合喷油泵凸轮轴相位及供油时刻的装置，复合喷油泵由喷油泵Ⅰ和喷油泵Ⅱ复合而成；喷油泵Ⅰ的驱动端与步进驱动电机输出端相连；步进驱动电机的输出端安装有缺齿的齿轮盘Ⅰ，对应齿轮盘Ⅰ磁电传感器Ⅰ；联轴节Ⅰ与喷油泵Ⅰ的驱动端之间安装有缺齿的齿轮盘Ⅱ；对应齿轮盘Ⅱ设置有磁电传感器Ⅱ；喷油泵Ⅰ的输出端和喷油泵Ⅱ的驱动端通过联轴节Ⅱ相连，喷油泵Ⅱ的输出端安装有角标仪；本发明提高了油泵试验台对喷油泵和喷油器测量和评价的准确性。
The invention belongs to the technical field of diesel engine testing, and provides a device and a method for an oil pump test bench to detect the phase of a camshaft of a compound fuel injection pump and the timing of fuel supply. A device for testing the camshaft phase and fuel supply timing of a compound fuel injection pump is proposed. The compound fuel injection pump is composed of fuel injection pump I and fuel injection pump II. The driving end of fuel injection pump I and the output of the stepper drive motor The output end of the stepper drive motor is equipped with a gear plate I with missing teeth, corresponding to the magnetoelectric sensor I of the gear plate I; a toothless gear plate II is installed between the coupling I and the driving end of the fuel injection pump I; A magnetoelectric sensor II is arranged corresponding to the gear plate II; the output end of the fuel injection pump I and the driving end of the fuel injection pump II are connected through the coupling II, and the output end of the fuel injection pump II is provided with an angle scale; the invention improves the fuel pump test bench. Accuracy of measurement and evaluation of fuel injection pumps and injectors.
Description
Technical field
The invention belongs to diesel engine test technical fields, specifically describe a kind of for the compound injection pump of Fuel Injection Pump Test-Bed detection
Camshaft phase and the device and method at fuel feeding moment.
Background technique
Injection pump is the most important component of diesel engine, is considered as " heart " component of diesel engine, and injection pump once goes out
Problem can make entire diesel engine work not normal, and the injection pump of High speed and heavy duty diesel engines more than 12 cylinders generally uses multi-cylinder oil spout
Pump by linking together with elastic coupling flexible forms combined type multi-cylinder fuel injection pump, High speed and heavy duty diesel engine with
As the increase of diesel engine speed and load, required fuel delivery increase during test, combined type multi-cylinder fuel injection pump is caused to be held
The load received increases, while the load that each injection pump of combined type multi-cylinder fuel injection pump is born is not fully consistent, elastic coupling joint
Adjustment effect it is limited, the revolving speed that will lead to each injection pump of combined type multi-cylinder fuel injection pump is uneven, causes each fuel injection camshaft
The consistency of phase issues the fuel feeding moment for changing, and then influencing each cylinder of High speed and heavy duty diesel engine.
Traditional Fuel Injection Pump Test-Bed can complete the pretravel tune of the fuel delivery detection of single multi-cylinder fuel injection pump, injection pump
The functions such as whole, injection pump and the detection of fuel injector oil mass inhomogeneities.But since the limitation of functions of the equipments makes it to can not carry out
The function of the detection of combined type multi-cylinder fuel injection pump camshaft phase and the test of fuel feeding moment, can not pass through combined type multi-cylinder fuel injection pump
Camshaft phase difference, the difference of oil injection time are further analyzed injection pump after shaft coupling links together.
Summary of the invention
The present invention to solve the above-mentioned problems, purpose be to provide that a kind of for Fuel Injection Pump Test-Bed to detect compound injection pump convex
The device and method at wheel shaft phase and fuel feeding moment.
For up to the above goal of the invention, the present invention adopts the following technical scheme:
A kind of to detect compound fuel injection camshaft phase and the device at fuel feeding moment for Fuel Injection Pump Test-Bed, compound injection pump is by spraying
Oil pump I and injection pump II are combined；The driving end of the injection pump I passes through shaft coupling I and stepper drive motors output end phase
Even；The output end of the stepper drive motors is equipped with the toothed disc I of hypodontia, and the corresponding toothed disc I is provided with to right
The revolving speed and phase signal of stepper drive motors output end carry out detection magnetoelectric transducer I；The shaft coupling I and injection pump I
The toothed disc II of hypodontia is installed between driving end；Structure of the structure of toothed disc II with the toothed disc I；The corresponding tooth
Wheel disc II, which is provided with, drives the revolving speed at end and the magnetoelectric transducer II of phase signal to detect injection pump I；The injection pump I
Output end is connected with the driving end of injection pump II by shaft coupling II, and the output end of the injection pump II is equipped with corner marking instrument, is used
To detect the revolving speed and phase signal of II output end of injection pump；The injection pump I, injection pump II top be provided with it is multiple go out
Oil valve, each delivery valve pass through corresponding high-pressure oil pipe respectively and are connected with fuel injector；High-pressure oil pipe with it is corresponding
Delivery valve between the pressure measurement connector I being connected with high-pressure oil pipe is installed, and pacify on the pressure measurement connector I
Equipped with the pressure sensor I to detect high pressure oil tube pump end tubing pressure；Pacify between high-pressure oil pipe and corresponding fuel injector
It is equipped with equipped with the pressure measurement connector II being connected with high-pressure oil pipe, and on the pressure measurement connector II to detect
The pressure sensor II of high-pressure oil pipe nozzle end tubing pressure；The magnetoelectric transducer I, magnetoelectric transducer II with pressure
Sensor I, pressure sensor II and host computer are connected, and carry out synchronous acquisition;By comparing motor output end, injection pump
The consistency at I driving end, II output end revolving speed of injection pump and phase signal judges respectively to pump under two practical connection status of injection pump
The phase equalization of camshaft.
Corresponding each fuel injector is provided with the measuring cup to measure fuel injector distributive value.
The rack gear of the injection pump I and injection pump II links together, and passes through rack regulating device
Control rack stroke；The rack regulating device is mounted on I input terminal of injection pump, and the rack gear of stretching passes through support bracket fastened
Adjustment hole, and pass through the clamping nut stationary rack elongation before and after adjustment hole；The rack gear amount of being stretched into is determined as drawing high state tune
The rack gear length of knothole front end subtracts the rack gear length of free state adjustment hole front end.
Compound fuel injection camshaft phase and the device at fuel feeding moment are detected to compound for Fuel Injection Pump Test-Bed using a kind of
The method that fuel injection camshaft phase and fuel feeding moment are detected are as follows: water, oil needed for Fuel Injection Pump Test-Bed test is completed in connection
Road correlation corollary equipment determines the grating base position and the last one the delivery valve camshaft top dead-centre position of injection pump II of corner marking instrument
The differential seat angle set determines high-pressure oil pipe I and each delivery valve of injection pump II relative to the last one the delivery valve camshaft of injection pump II
The differential seat angle of upper dead center position；Start stepper drive motors, setting measurement revolving speed and recurring number；Adjusting gear rack regulating device, if
Set rack stroke；Believed using host computer synchronous acquisition different rotating speeds, the revolving speed of different rack stroke subscript instrument measurements and phase
Number and pressure sensor I, pressure sensor II 1 measurement obtain pump end, mouth side pressure force data；For guarantee measurement accuracy and accurately
Property, when being detected to the high-pressure oil pipe of high-pressure oil pipe I and each fuel-displaced valve position of injection pump II, synchronize to high-pressure oil pipe I and spray
All high pressure oil tube pumps end that oil pump II is connected, mouth end pressure measure；Magnetoelectric transducer I, magnetoelectric transducer II, footmark
Instrument measurement revolving speed and phase signal, be with the grating base position of toothed disc, the edentulous site of toothed disc II and corner marking instrument
Benchmark, analysis stepper drive motors, high-pressure oil pipe I and II every revolution of injection pump under different rotating speeds, different rack strokes turn
The consistency of speed and phase signal, judges combined type injection pump II cam of high-pressure oil pipe I and injection pump under actual installation state
The consistency of axis phase；Obtain high-pressure oil pipe I and injection pump II different rotating speeds, different rack gears in the fuel injector being changed without
High pressure oil tube pump end, mouth side pressure force curve under stroke based on angular signal；The rack gear for stating injection pump I and injection pump II is connected to
Together, pass through rack regulating device
Control rack stroke.The rack regulating device is mounted on I input terminal of injection pump, and the rack gear of stretching passes through support bracket fastened
Adjustment hole, and pass through the clamping nut stationary rack elongation before and after adjustment hole.The rack gear amount of being stretched into is determined as drawing high state tune
The rack gear length of knothole front end subtracts the rack gear length of free state adjustment hole front end.
Delivery valve each under same rotational speed, identical rack stroke corresponding high pressure oil tube pump end, mouth side pressure force curve is each
The corresponding corner numerical value removal angular interval of pressure value point compares, while being obtained according to delivery valve opening pressure and closing pressure
To delivery valve start-up time, finish time and duration；Analyze high-pressure oil pipe I and each delivery valve of injection pump II it is fuel-displaced rule
Consistency；As shown in figure 4, this is I first delivery valve high pressure oil tube pump end pressure curves of injection pump, delivery valve opening pressure
400bar, corresponding camshaft degree are -23deg, close 340 bar of pressure, corresponding camshaft degree is -1deg, fuel-displaced
The oil injection duration of valve is -1-(-23)=22deg；Method obtains injection pump I according to this and all delivery valves of injection pump II open pressure
Power and close pressure and obtain delivery valve start-up time, finish time and duration, can high-pressure oil pipe I and injection pump II respectively go out
The consistency of the fuel-displaced rule of oil valve；Replacement different type fuel injector is tested, and obtains high-pressure oil pipe I and injection pump II is being replaced
High pressure oil tube pump end, mouth end pressure in the case where various fuel injectors under different rotating speeds, different rack strokes based on angular signal
Curve；During above-mentioned test, each fuel injector tip is equipped with measuring cup, can analyze high under different rotating speeds, different rack strokes
The consistency of II delivery valve oil mass of pressuring oil pipe I and injection pump.
It is proposed by the present invention a kind of to detect compound fuel injection camshaft phase and the dress at fuel feeding moment for Fuel Injection Pump Test-Bed
It sets, can realize that the detection of fuel injector atomization quality, the flow detection of fuel injector, fuel injector oil mass are uneven by adopting the above technical scheme
Property the functions such as detection, and can realize that combined type injection pump different rotating speeds, the detection of different rack stroke under actual working state are each
The phase equalization of fuel injection camshaft, high pressure oil tube pump end, mouth end pressure consistency；The use scope of equipment is extended,
Improve the accuracy that Fuel Injection Pump Test-Bed is measured and evaluated to injection pump and fuel injector.
Detailed description of the invention
Fig. 1 is that combined type injection pump is installed to the schematic diagram on Fuel Injection Pump Test-Bed:
Fig. 2 is toothed disc structural schematic diagram:
Fig. 3 is the A-A cross-sectional view of Fig. 2；
Fig. 4 is rack stroke regulating device schematic diagram:
Fig. 5 is pump end pressure curve synoptic diagram；
Fig. 6 is mouth end pressure curve synoptic diagram.
In figure: 1, stepper drive motors, 2, toothed disc I, 3, shaft coupling I, 4, toothed disc II, 5, injection pump I, 6, shaft coupling
II, 7, injection pump II, 8, corner marking instrument, 9, high-pressure oil pipe, 10, pressure measurement connector I, 11, pressure measurement connector II, 12, oil spout
Device, 13, measuring cup, 14, sliding rail, 15, magnetoelectric transducer II, 16, magnetoelectric transducer I, 17, host computer, 18, pressure sensor I,
19, pressure sensor II, 21, rack regulating device, 22, delivery valve, 23, fixed bracket, 24, front end rack gear, 25, compression spiral shell
Cap.
Specific embodiment
Specific embodiment shown in the present invention is described in detail below with reference to attached drawing, those skilled in the art's root
According to the content of present invention to some nonessential modifications and adaptations of the invention, the present invention is still fallen within.
As shown in Figure 1, a kind of detect compound fuel injection camshaft phase and the device at fuel feeding moment for Fuel Injection Pump Test-Bed,
Compound injection pump is combined by injection pump I 5 and injection pump II 7；The driving end of the injection pump I 5 passes through shaft coupling I 3 and step
It is connected into 1 output end of driving motor；The output end of the stepper drive motors 1 is equipped with the toothed disc I 2 of hypodontia, it is corresponding described in
Toothed disc I 2 be provided with to stepper drive motors output end revolving speed and phase signal carry out detection magnetoelectric transducer I
16；The toothed disc II 4 of hypodontia is installed between the shaft coupling I 3 and the driving end of injection pump I 5；The structure of toothed disc II 4 is same
The structure of the toothed disc I 2；Toothed disc II 4, the structure of toothed disc I 2 are as shown in Figure 2 and Figure 3；The corresponding toothed disc II 4
It is provided with and drives the revolving speed at end and the magnetoelectric transducer II 15 of phase signal to detect injection pump I；The injection pump I 5 it is defeated
Outlet is connected with the driving end of injection pump II 7 by shaft coupling II 6, and the output end of the injection pump II 7 is equipped with corner marking instrument 8,
To detect the revolving speed and phase signal of II 7 output end of injection pump；The injection pump I 5, injection pump II 7 top be provided with
Multiple delivery valves 22, each delivery valve 22 are connected by corresponding high-pressure oil pipe 9 with fuel injector 12 respectively；In high pressure
The pressure measurement connector I 10 being connected with high-pressure oil pipe is installed, and described between oil pipe 9 and corresponding delivery valve 22
Pressure sensor I 18 to detect high pressure oil tube pump end tubing pressure is installed on pressure measurement connector I；High-pressure oil pipe and institute
The pressure measurement connector II 11 being connected with high-pressure oil pipe is installed between corresponding fuel injector, and is connect in the pressure measurement
Pressure sensor II 19 to detect high-pressure oil pipe nozzle end tubing pressure is installed on first II；The magnetoelectric transducer I
16, magnetoelectric transducer II 15, pressure sensor I 18, pressure sensor II 19 are connected with host computer 17, and the magnetoelectricity passes
Sensor I 16, magnetoelectric transducer II 15 are for measuring toothed disc I 2, the revolving speed of toothed disc II 4 and phase signal and and pressure sensing
Device I 10, pressure sensor II 11 are connected with host computer 17, and carry out synchronous acquisition.By comparing 1 output end of motor, oil spout
The consistency for pumping I 5 driving ends, II 7 output end revolving speed of injection pump and phase signal judges under two practical connection status of injection pump
The phase equalization of each pump camshaft.
Corresponding each fuel injector is provided with the measuring cup to measure fuel injector distributive value.
As shown in figure 4, the rack gear of the injection pump I and injection pump II links together, controlled by rack regulating device 21
Rack stroke processed;The rack regulating device 21 is mounted on I 5 input terminal of injection pump, and the front end rack gear 24 of stretching passes through fixed branch
The adjustment hole of frame 23, and pass through the 25 stationary rack elongation of clamping nut before and after adjustment hole.The rack gear amount of being stretched into is determined as drawing
The rack gear length for rising status adjustment hole front end subtracts the rack gear length of free state adjustment hole front end.
Compound fuel injection camshaft phase and the device at fuel feeding moment are detected to compound for Fuel Injection Pump Test-Bed using a kind of
The method that fuel injection camshaft phase and fuel feeding moment are detected are as follows: water, oil needed for Fuel Injection Pump Test-Bed test is completed in connection
The correlation corollary equipment such as road, the grating base position of toothed disc I 2, the edentulous site of toothed disc II 4 and corner marking instrument 8 is adjusted
To same angle.Start stepper motor 1, setting measurement revolving speed and recurring number.Rack gear row is arranged in adjusting gear rack regulating device 21
Journey.Use magnetoelectric transducer I 16, magnetoelectric transducer II 15, angle under 17 synchronous acquisition different rotating speeds of host computer, different rack strokes
Revolving speed and phase signal that instrument 8 measures are marked, with the grating benchmark of toothed disc 2, the edentulous site of toothed disc II 4 and corner marking instrument 8
On the basis of position, analysis stepper motor 1, high-pressure oil pipe I 5 and every turn one of injection pump II 7 under different rotating speeds, different rack strokes
The consistency for enclosing revolving speed and phase signal, judges combined type injection pump high-pressure oil pipe I 5 and injection pump II under actual installation state
The consistency of 7 camshaft phases;Judgment method: by the edentulous site tune of toothed disc I 2, toothed disc II 4 and corner marking instrument 8 before test
Whole to start Fuel Injection Pump Test-Bed to same position, revolving speed is fixed to 900r/min.Assuming that the number of teeth of toothed disc I 2, toothed disc II 4 is
90 lack 1 teeth, and the grating quantity of corner marking instrument 8 is 720 to lack 1, toothed disc I 2, toothed disc II 4 by magnetoelectricity magnetoelectric transducer I 16,
The signal that magnetoelectric transducer II 15 obtains is dextrorotation signal, and a tooth is a dextrorotation signal, and a circle should occur 90 and lack 1, angle
The signal that mark instrument 8 obtains is square-wave signal, and a circle should occur 720 and lack 1.The square-wave signal of one corner marking instrument is toothed disc I 2, tooth
Eight times of the dextrorotation signal of wheel disc II 4, toothed disc I 2 is identical with II 4 number of teeth of toothed disc, therefore when stepper drive motors 1 export
When end, injection pump I 5 drive end, II 7 output end revolving speed of injection pump and identical phase signal, in addition to edentulous site, when toothed disc I 4
When collecting a dextrorotation signal, toothed disc II 4 also should just collect a dextrorotation signal, and corner marking instrument 8 just collects 8
Square-wave signal.When the dextrorotation signal that toothed disc II 4 is collected is extra or less than one, it is believed that its revolving speed increases or subtracts
It is small, and record time difference.When the square-wave signal that corner marking instrument 8 is collected is extra or less than 8, it is believed that its revolving speed liter
High or reduction, records time difference.Obtain 1 output end of stepper drive motors, injection pump I 5 drives end, II 7 output end of injection pump
Shafting revolves the consistency for each position revolving speed that turns around.1 output end of stepper drive motors, injection pump I 5 are driven into end, injection pump II 7
The tach signal of output end converts long angular domain signal, and toothed disc I 2, toothed disc II 4 and corner marking instrument 8 exist when inconsistent according to revolving speed
In rotation is turned around, toothed disc I 2, toothed disc II 4 in each dextrorotation signal and the time difference between corner marking instrument 8 calculate phase
Angular difference.Obtain 1 output end of stepper drive motors, injection pump I 5 drives end, the rotation of II 7 output end shafting of injection pump turns around everybody
Set the consistency at phase angle;
By the revolving speed of the injection pump II 7 detected of corner marking instrument 8, the signal of pressure sensor I 18 and pressure sensor II 19, obtain
To using II angular signal of injection pump as the high pressure oil tube pump end of abscissa, mouth side pressure force curve, wherein angular signal is to pass through angle
The revolving speed for marking instrument 8 obtains, and corner marking instrument is 720 scarce 1 gratings, and a circle 720 lacks 1 square-wave signal, each square-wave signal represents
0.5deg before test, is determined on 8 edentulous site of corner marking instrument and injection pump I 5 and each 22 position camshaft of delivery valve of injection pump II 7
The angle of dead-centre position starts Fuel Injection Pump Test-Bed, measurement high pressure oil tube pump end, mouth side pressure force curve and corner marking instrument tach signal.
The tach signal of corner marking instrument 8 is converted into angle signal, using angle signal as abscissa, pressure value is led as ordinate
Enter oil-line pump end, mouth side pressure force data, is formed using II angular signal of injection pump as the high pressure oil tube pump end of abscissa, mouth end pressure
Curve.
There is a fixed fuel-displaced cracking pressure for the delivery valve 22 of each injection pump, it is assumed that cracking pressure is
400bar reaches for the first time when recording injection pump I 5 and the rising of all high pressure oil tube pump end pressure curve left pressures of injection pump II 7
Difference to the corresponding crank angle numerical value of 400bar, and between calculating, difference are each of injection pump I 5 and injection pump II 7
The actual fuel injection angular interval of delivery valve has theoretical injection interval angle for injection pump I and injection pump II, compares actual fuel injection interval
Angle and theoretical injection interval angular difference can determine whether each 22 oil spout start-up time consistency of delivery valve of injection pump.Also according to injection pump
I 5 and the fuel-displaced closing pressure of II 7 delivery valve of injection pump 22 obtain corresponding crank angle numerical value, calculate the fuel-displaced closing of delivery valve 22
Crank angle difference between the crank angle numerical value and the fuel-displaced cracking pressure crank angle numerical value of delivery valve 22 of pressure, is sprayed
The oil injection duration of oil pump I 5 and each delivery valve 22 of injection pump II 7 compares injection pump I 5 and each 22 oil spout of delivery valve of injection pump II 7
The consistency of duration judges the one of injection pump I 5 and each 22 position oil injection duration of delivery valve of all injection pumps of injection pump II 7
Cause property, injection pressure and oil injection time data, judge the consistency of each fuel-displaced valve position injection pressure of all injection pumps, phase.
All parts are completed after installing, the correlation such as water, oil circuit needed for connecting completion Fuel Injection Pump Test-Bed test, which is matched, to be arranged
It is standby, determine the angle of the last one delivery valve camshaft upper dead center position of the grating base position Yu injection pump II 7 of corner marking instrument 8
Difference determines high-pressure oil pipe I 5 and each delivery valve of injection pump II 7 relative to the last one the delivery valve camshaft top dead-centre of injection pump II 7
The differential seat angle of position.Start stepper motor 1, setting measurement revolving speed and recurring number.Rack gear row is arranged in adjusting gear rack regulating device 21
Journey.Using 17 synchronous acquisition different rotating speeds of host computer, the revolving speed of 8 measurement of different rack stroke subscript instrument and phase signal and
Pressure sensor I 18, the measurement of pressure sensor II 19 obtain pump end, mouth side pressure force data;To guarantee measurement accuracy and accuracy,
When being detected to the high-pressure oil pipe 9 of high-pressure oil pipe I 5 and each 22 position of delivery valve of injection pump II 7, synchronize to I 5 He of high-pressure oil pipe
All high pressure oil tube pumps end that injection pump II 7 is connected, mouth end pressure measure.Magnetoelectric transducer I 16, magnetoelectric transducer II
15, revolving speed and phase signal that corner marking instrument 8 measures, with the grating of toothed disc 2, the edentulous site of toothed disc II 4 and corner marking instrument 8
On the basis of base position, analysis stepper motor 1, high-pressure oil pipe I 5 and injection pump II 7 under different rotating speeds, different rack strokes is every
Turn around the consistency of revolving speed and phase signal, judges combined type injection pump high-pressure oil pipe I 5 and oil spout under actual installation state
Pump the consistency of II 7 camshaft phases.It is different at fuel injector 12 being changed without to obtain high-pressure oil pipe I 5 and injection pump II 7
The high-pressure oil pipe 9 based on angular signal pumps end, mouth side pressure force curve under revolving speed, different rack strokes；As shown in Figure 5 and Figure 6, scheme
5 be the high pressure oil tube pump end curve based on angular signal, Fig. 6 be the high pressure oil nipple end curve based on angular signal, this two
Curve is using the angular signal of injection pump II as abscissa, using pressure value as ordinate.
Delivery valve 22 each under same rotational speed, identical rack stroke corresponding high-pressure oil pipe 9 pump end, mouth side pressure force curve is every
The corresponding corner numerical value removal angular interval of a pressure value point compares, while being pressed according to 22 cracking pressure of delivery valve and closing
Power obtains delivery valve start-up time, finish time and duration;Analysis high-pressure oil pipe I 5 and each delivery valve 22 of injection pump II 7 go out
The consistency of fuel oil meter rule.
Replacement different type fuel injector is tested, and is obtained high-pressure oil pipe I 5 and injection pump II 7 and is being replaced various fuel injectors
In the case where high pressure oil tube pump end under different rotating speeds, different rack stroke based on angular signal, mouth side pressure force curve.
Delivery valve 22 each under same rotational speed, identical rack stroke corresponding high-pressure oil pipe 9 pump end, mouth side pressure force curve is every
The corresponding corner numerical value removal angular interval of a pressure value point compares, while being pressed according to 12 cracking pressure of fuel injector and closing
Power obtains 12 start-up time of fuel injector, finish time and duration.Analyze the consistency of each 12 fuel injection characteristic of fuel injector.
During above-mentioned test, each 12 end of fuel injector is equipped with measuring cup 13, can analyze in different rotating speeds, different rack gear rows
The consistency of II 7 delivery valve oil mass of high-pressure oil pipe I 5 and injection pump under journey.
Corner marking instrument used by this combined type fuel injection camshaft phase and fuel feeding timing detection device and method is Lee AVL
The 365C of Si Te test equipment Co., Ltd.
Claims (4)
1. a kind of detect compound fuel injection camshaft phase and the device at fuel feeding moment for Fuel Injection Pump Test-Bed, it is characterised in that:
Compound injection pump is combined by injection pump I and injection pump II；It is driven by shaft coupling I and stepping at the driving end of the injection pump I
Dynamic motor output end is connected；The output end of the stepper drive motors is equipped with the toothed disc I of hypodontia, the corresponding toothed disc
I be provided with to stepper drive motors output end revolving speed and phase signal carry out detection magnetoelectric transducer I；The shaft coupling
The toothed disc II of hypodontia is installed between I and the driving end of injection pump I；Structure of the structure of toothed disc II with the toothed disc I；
The corresponding toothed disc II, which is provided with, drives the revolving speed at end and the magnetoelectric transducer II of phase signal to detect injection pump I；
The output end of the injection pump I is connected with the driving end of injection pump II by shaft coupling II, the output end peace of the injection pump II
Equipped with corner marking instrument, to detect the revolving speed and phase signal of II output end of injection pump；The top of the injection pump I, injection pump II
Multiple delivery valves are provided with, each delivery valve passes through corresponding high-pressure oil pipe respectively and is connected with fuel injector；In height
The pressure measurement connector I being connected with high-pressure oil pipe is installed, and in the pressure between pressuring oil pipe and corresponding delivery valve
Pressure sensor I to detect high pressure oil tube pump end tubing pressure is installed on power measurement connector I；High-pressure oil pipe with it is corresponding
Fuel injector between the pressure measurement connector II being connected with high-pressure oil pipe is installed, and on the pressure measurement connector II
Pressure sensor II to detect high-pressure oil pipe nozzle end tubing pressure is installed；The magnetoelectric transducer I, magnetic-electric sensing
Device II is connected with pressure sensor I, pressure sensor II and host computer, and carries out synchronous acquisition;Pass through comparison electricity
Machine output end, injection pump I drive the consistency of end, II output end revolving speed of injection pump and phase signal to judge two injection pump reality
The phase equalization of camshaft is respectively pumped under connection status.
2. as described in claim 1 a kind of compound fuel injection camshaft phase and fuel feeding moment are detected for Fuel Injection Pump Test-Bed
Device, it is characterised in that: corresponding each fuel injector is provided with the measuring cup to measure fuel injector distributive value.
3. as described in claim 1 a kind of compound fuel injection camshaft phase and fuel feeding moment are detected for Fuel Injection Pump Test-Bed
Device, it is characterised in that: the rack gear of the injection pump I and injection pump II links together, and controls tooth by rack regulating device
Stroke；The rack regulating device is mounted on I input terminal of injection pump, and the rack gear of stretching passes through support bracket fastened adjustment hole, and
Pass through the clamping nut stationary rack elongation before and after adjustment hole；The rack gear amount of being stretched into is determined as drawing high status adjustment hole front end
Rack gear length subtracts the rack gear length of free state adjustment hole front end.
4. one kind described in claim 1-3 any claim is utilized to detect compound fuel injection camshaft for Fuel Injection Pump Test-Bed
The method that the device at phase and fuel feeding moment detects compound fuel injection camshaft phase and fuel feeding moment are as follows:
Water, oil circuit correlation corollary equipment needed for Fuel Injection Pump Test-Bed test is completed in connection, determine the grating base position of corner marking instrument
With the differential seat angle of injection pump II the last one delivery valve camshaft upper dead center position, determine that high-pressure oil pipe I and injection pump II respectively go out
Differential seat angle of the oil valve relative to the last one the delivery valve camshaft upper dead center position of injection pump II；Start stepper drive motors, if
Set measurement revolving speed and recurring number；Rack stroke is arranged in adjusting gear rack regulating device；Using host computer synchronous acquisition different rotating speeds,
The revolving speed and phase signal and pressure sensor I of different rack stroke subscript instrument measurements, the measurement of pressure sensor II 1 obtain
Pump end, mouth side pressure force data；To guarantee measurement accuracy and accuracy, to high-pressure oil pipe I and each fuel-displaced valve position of injection pump II
When high-pressure oil pipe is detected, all high pressure oil tube pumps end connected to high-pressure oil pipe I and injection pump II, mouth end pressure are synchronized
It measures；The revolving speed and phase signal that magnetoelectric transducer I, magnetoelectric transducer II, corner marking instrument measure, with toothed disc, toothed disc
On the basis of II edentulous site and the grating base position of corner marking instrument, analysis stepping under different rotating speeds, different rack strokes
The consistency of driving motor, high-pressure oil pipe I and II every revolution revolving speed of injection pump and phase signal, judges that combined type injection pump exists
The consistency of II camshaft phase of high-pressure oil pipe I and injection pump under actual installation state；It obtains high-pressure oil pipe I and injection pump II exists
High pressure oil tube pump end, mouth side pressure in the case of the fuel injector being changed without under different rotating speeds, different rack strokes based on angular signal
Force curve；The rack gear for stating injection pump I and injection pump II links together, and passes through rack regulating device
Control rack stroke.The rack regulating device is mounted on I input terminal of injection pump, and the rack gear of stretching passes through support bracket fastened
Adjustment hole, and pass through the clamping nut stationary rack elongation before and after adjustment hole.The rack gear amount of being stretched into is determined as drawing high state tune
The rack gear length of knothole front end subtracts the rack gear length of free state adjustment hole front end；
By delivery valve each under same rotational speed, identical rack stroke corresponding high pressure oil tube pump end, each pressure of mouth side pressure force curve
The corresponding corner numerical value removal angular interval of numerical point compares, while being gone out according to delivery valve opening pressure and closing pressure
Oil valve start-up time, finish time and duration；It is consistent with the fuel-displaced rule of each delivery valve of injection pump II to analyze high-pressure oil pipe I
Property；As shown in figure 4, this is I first delivery valve high pressure oil tube pump end pressure curves of injection pump, delivery valve opening pressure
400bar, corresponding camshaft degree are -23deg, close 340 bar of pressure, corresponding camshaft degree is -1deg, fuel-displaced
The oil injection duration of valve is -1-(-23)=22deg；Method obtains injection pump I according to this and all delivery valves of injection pump II open pressure
Power and close pressure and obtain delivery valve start-up time, finish time and duration, can high-pressure oil pipe I and injection pump II respectively go out
The consistency of the fuel-displaced rule of oil valve；Replacement different type fuel injector is tested, and obtains high-pressure oil pipe I and injection pump II is being replaced
High pressure oil tube pump end, mouth end pressure in the case where various fuel injectors under different rotating speeds, different rack strokes based on angular signal
Curve；During above-mentioned test, each fuel injector tip is equipped with measuring cup, can analyze high under different rotating speeds, different rack strokes
The consistency of II delivery valve oil mass of pressuring oil pipe I and injection pump.
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| CN111561414A (en) * | 2020-04-29 | 2020-08-21 | 河南柴油机重工有限责任公司 | Method and device for measuring speed fluctuation of camshaft of high pressure oil pump |
| CN112065624A (en) * | 2020-09-10 | 2020-12-11 | 潍柴动力股份有限公司 | High-pressure oil pump mounting method, engine and vehicle |
| CN112213110A (en) * | 2020-09-29 | 2021-01-12 | 上汽通用五菱汽车股份有限公司 | Method and system for measuring phase of driving cam of high-pressure oil pump of gasoline engine and storage medium |
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