CN108361138A - High-pressure common-rail pipe flow-limiting valve diagnosis detecting method and device - Google Patents
High-pressure common-rail pipe flow-limiting valve diagnosis detecting method and device Download PDFInfo
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- CN108361138A CN108361138A CN201810081932.1A CN201810081932A CN108361138A CN 108361138 A CN108361138 A CN 108361138A CN 201810081932 A CN201810081932 A CN 201810081932A CN 108361138 A CN108361138 A CN 108361138A
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- limiting valve
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- valve
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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
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
- F02M55/025—Common rails
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The present invention relates to a kind of high-pressure common-rail pipe flow-limiting valve diagnosis detecting method and devices, it is made of Electrocontrolled high-pressure common rail fuel injection system, temperature measurement module, flow control and measurement module, electronic control system, flow-limiting valve flow measurement pipeline installation exhaust oil catcher, the flow that system at regular intervals measures diagnosis detection device electric-controlled fuel injector carries out compensation for calibrating errors, and the closing discharge characteristic of slope and flow-limiting valve is risen come the performance of comprehensive descision flow-limiting valve by temperature when measuring flow-limiting valve work.The present invention is for detecting common rail pipe current limliting valve performance, and judges flow-limiting valve internal leakage using temperature liter slope or move the failures such as dumb, flow-limiting valve fault type can be analyzed more fully hereinafter, ensure that the accuracy and reliability of flow-limiting valve performance detection, the present invention can be directly used for the exploitation, quality control and performance detection of common rail pipe flow-limiting valve Related product.
Description
Technical field
The present invention relates to a kind of flow-limiting valve diagnosis detecting method and device, especially a kind of high-pressure common-rail pipe flow-limiting valve diagnosis
Detection method and device.
Background technology
The application of Electrocontrolled high-pressure common rail fuel injection system on the engine is a great technological progress, can be direct
Performance and the exhaust emissions for effectively promoting engine are horizontal.As safe dynamic power machine component is related to, Electrocontrolled high-pressure common rail fires
Electronic fuel injection system is in design and manufacture, it is necessary to the Security Countermeasures for considering all kinds of special circumstances, to ensure that product safety is reliable.
Electrocontrolled high-pressure common rail fuel injection system is to form substantially invariable pressure by the storage pressure function of high-pressure common-rail pipe,
And distributed to engine chamber by electric-controlled fuel injector, to prevent electric-controlled fuel injector clamping stagnation etc. from occurring extremely, lead to high compression ignition
Oil is directly entered engine cylinder in the state of uncontrolled, and high-pressure common-rail pipe installs flow-limiting valve, when electric-controlled fuel injector occurs
When failure is led directly to, flow is more than the normal range of operation of flow-limiting valve, current limliting valve events cutoff high fuel oil, to play safe guarantor
Shield acts on.
Important safety component of the flow-limiting valve as high-pressure common-rail pipe, must carry out stringent performance during the manufacturing
Detection, to judge whether current limliting valve performance meets the requirements, it is ensured that only qualified product could pass through.Usual flow-limiting valve detection exists
It is carried out on special Fuel Injection Pump Test-Bed, analyzes and determines whether current limliting valve performance meets the requirements by the measurement of various setup parameters,
To judge whether current limliting valve performance is qualified.Existing method usually adjusts piping flow with electric-controlled fuel injector, passes through flow-limiting valve
The measurement of discharge characteristic is closed when work to analyze and determine its performance, but practical due to fuel oil temperature, electric-controlled fuel injector aging, peace
There are larger impacts to flow measurement for dress mode etc., therefore, only analyze the characteristic of flow-limiting valve not by closing the measurement of flow
It is enough comprehensive and accurate, the conclusion of mistake can be even obtained sometimes, such as when flow-limiting valve internal leakage or dumb movement, if closing
It closes flow and meets preset range, it is clear that current limliting valve performance is only unable to judge accurately by flow, also can not just be obtained just
True conclusion；Moreover since fuel-viscosity variation is larger when low temperature, flow-limiting valve itself job insecurity, accidentalia can lead to flow-limiting valve
It acts and closes, such situation can also influence the accuracy of current limliting valve performance judgement, so as to cause erroneous judgement.
Invention content
The purpose of the present invention is overcoming the deficiencies in the prior art, a kind of high-pressure common-rail pipe flow-limiting valve diagnosis inspection is provided
Survey method, this method are exclusively used in the diagnosis detection of high-pressure common-rail pipe flow-limiting valve, and simulate the working condition of practical flow-limiting valve, it is ensured that
Test process is consistent with actual working state, comprehensively, objectively reflects the performance characteristics of flow-limiting valve itself, and is easy in practical life
Implement during production.
The present invention also provides a kind of high-pressure common-rail pipe flow-limiting valves to diagnose detection device, is exclusively used in high-pressure common-rail pipe flow-limiting valve
Diagnosis detection, it is ensured that test process is consistent with actual working state.
According to technical solution provided by the invention, the high-pressure common-rail pipe flow-limiting valve diagnoses detection device, it is characterized in that：Packet
It includes by fuel tank, high-pressure oil pump, high-pressure oil pipe, high-pressure common-rail pipe, pressure sensor, pressure safety valve, tested flow-limiting valve, pressure
The Electrocontrolled high-pressure common rail fuel injection system of safety valve oil return pipe, system oil return pipe and electronic control system composition, fuel tank are logical
It crosses high-pressure oil pump and connects high-pressure common-rail pipe with high-pressure oil pipe, pressure sensor is set on high-pressure common-rail pipe, high-pressure common-rail pipe is let out
Pressure mouth setting pressure safety valve is simultaneously connect by pressure safety valve oil return pipe with fuel tank, the high pressure oil export peace of high-pressure common-rail pipe
Dress is tested flow-limiting valve, and tested flow-limiting valve connects flow control and measurement module, flow control with defogger by electric-controlled fuel injector
And measurement module connects fuel tank by system oil return pipe；The control signal and electronic control system of the electric-controlled fuel injector are real-time
Temperature measurement module is installed in communication, the side for being tested flow-limiting valve, and the signal of temperature measurement module connects electronic control system, flow control and survey
The signal of amount module is connect with electronic control system, and the fuel oil of flow control and measurement module output is entered by system oil return pipe
Fuel tank.
Further, the flow control and measurement module include multiple flow diverter valves, and flow diverter valve is cut with flow
It changes and measuring unit connection is to realize that the action control of flow diverter valve, flow switching and measuring unit are connected to electronic control system
System；The P mouths of the flow diverter valve are connected to flow sensor after being vented oil catcher, and the output end connection of flow sensor is more
Road oil catcher, the connection of multichannel oil catcher connect fuel tank by system oil return pipe；The T mouths of the flow diverter valve connect multichannel collection
Oily device.
Further, the exhaust oil catcher is divided into oil inlet area and fuel-displaced area by intermediate bulkhead, has above intermediate bulkhead
The liquid in gap, oil inlet area flows into fuel-displaced area by gap；Oil inlet is set in the bottom of exhaust oil catcher, oil inlet is less than real
Liquid level when border works；In exhaust oil catcher, oil outlet is set；Peak is equipped with exhaust outlet, exhaust outlet above the oil inlet area
On pressure exhaust valve is installed.
Further, it is installed in each high pressure oil export of the high-pressure common-rail pipe and is tested flow-limiting valve.
The high-pressure common-rail pipe flow-limiting valve diagnosis detecting method, characterized in that carried out using above-mentioned diagnosis detection device
Detection, includes the following steps：
(1) carry out system temperature control, after fuel tank temperature reaches setting value temperature control terminate；
(2) after reaching set-point temperature, current limliting valve test is carried out, the change of surface temperature at any time when measuring flow-limiting valve work
Change curve, whether within the preset range to judge Wen Sheng, the tentative diagnosis that current limliting valve performance is carried out according to temperature curve is examined
It surveys；
(3) measurement that flow-limiting valve closes discharge characteristic is carried out, and combines the temperature preset when flow-limiting valve work in the time
It rises, judges whether within the limits prescribed to close flow, with the performance of comprehensive descision flow-limiting valve.
Further, the detection method further includes the steps that calibration electric-controlled fuel injector：Periodic measurement electric-controlled fuel injector
Flow carries out compensation for calibrating errors by flow to electric-controlled fuel injector.
The present invention simulates the actual working state of flow-limiting valve, and test can really reflect the course of work of flow-limiting valve, meanwhile, it is
System mounting temperature sensor, the closing discharge characteristic that slope and flow-limiting valve are risen by temperature when measuring flow-limiting valve work are sentenced to integrate
The performance of disconnected flow-limiting valve, improves the accuracy of current limliting valve performance judgement.The flow of periodic calibrating electric-controlled fuel injector, passes through flow
Difference to used in system electric-controlled fuel injector carry out compensation for calibrating errors, correct the consistent sex differernce of electric-controlled fuel injector, to compensation due to
Flow-limiting valve performance measurement deviation caused by electric-controlled fuel injector flow deviation.
Description of the drawings
Fig. 1 is the structural schematic diagram that high-pressure common-rail pipe flow-limiting valve of the present invention diagnoses detection device.
Fig. 2 is the schematic diagram of the flow control and measurement module.
Fig. 3 is the schematic diagram of the exhaust oil catcher.
Fig. 4 is electric-controlled fuel injector discharge characteristic figure.
Fig. 5 is that flow-limiting valve closes the temperature integrated instrumentation plan of flow.
Fig. 6 is flow-limiting valve temperature rise curve schematic diagram.
Fig. 7 is flow-limiting valve diagnostic test flow chart.
Reference sign：A- flow controls and measurement module, 1- testing stands chassis, 2- fuel tanks, the control of 3- testing stands
Computer, 4- high-pressure oil pumps, 5- electronic control systems, 6- high-pressure oil pipes, 7- high-pressure common-rail pipes, 8- electric-controlled fuel injectors, 9- defoggers,
10- pressure sensors, 11- pressure safety valves, 12- are tested flow-limiting valve, 13- temperature measurement modules, 14- pressure safety valves oil return pipe, 15-
System oil return pipe, 31- flow diverter valves, 32- flows switching and measuring unit, 33- exhaust oil catcher, 34- flow sensors,
35- multichannels oil catcher, the gaps 40-, 41- intermediate bulkheads, 42- exhaust outlets, 43- pressure exhaust valves.
Specific implementation mode
With reference to specific attached drawing, the invention will be further described.
As shown in Figure 1, high-pressure common-rail pipe flow-limiting valve diagnosis detection device of the present invention includes by fuel tank 2, high pressure oil
Pump 4, high-pressure oil pipe 6, high-pressure common-rail pipe 7, pressure sensor 10, pressure safety valve 11, tested flow-limiting valve 12, pressure safety valve return
The Electrocontrolled high-pressure common rail fuel injection system for the complete set that oil pipe 14, system oil return pipe 15 and electronic control system 5 form, electricity
It controls high pressure common rail fuel injection system to be mounted on testing stand chassis 1, fuel tank 2 is connected by high-pressure oil pump 4 and high-pressure oil pipe 6
High-pressure common-rail pipe 7, pressure sensor 10 is arranged on high-pressure common-rail pipe 7, and pressure safety valve 11 is arranged in the pressure relief opening of high-pressure common-rail pipe 7
And connect with fuel tank 2 by pressure safety valve oil return pipe 14, the high pressure oil export installation of high-pressure common-rail pipe 7 is tested flow-limiting valve
12, it is tested flow-limiting valve 12 and flow control and measurement module A, flow control and measurement is connected by electric-controlled fuel injector 8 and defogger 9
Modules A connects fuel tank 2 by system oil return pipe 15.If pressure release occurs in pressure safety valve 11, fuel oil passes through pressure safety valve
Oil return pipe 14 enters fuel tank 2, and testing stand controls computer 3 and realizes whole system control, and stores the parameter of measurement in real time.It is true
It is consistent with practical Electrocontrolled high-pressure common rail fuel injection system working condition to protect diagnosis detection device, 7 each high pressure of high-pressure common-rail pipe
Oil export all installs tested flow-limiting valve.The present invention is only illustrated by taking four cylinder Electrocontrolled high-pressure common rail fuel injection systems as an example, is examined
The high-pressure common-rail pipe 7 of disconnected detection device installs four tested flow-limiting valves 12 simultaneously, and when test passes through 5 closed loop control of electronic control system
Fuel pressure in high-pressure common-rail pipe 7 processed, control signal and 5 real-time communication of electronic control system of electric-controlled fuel injector 8, realizes electricity
The opening and closing control of fuel injector 8 is controlled, temperature measurement module 13 is mounted on the side of tested flow-limiting valve 12, and temperature measurement module 13 is by red
External pelivimetry mode realizes that the signal of temperature measurement module 13 connects electronic control system 5, realizes the reality for being tested 12 surface temperature of flow-limiting valve
When measure.Flow control and measurement module A realize the letter of piping flow switching and flow measurement, flow control and measurement module A
It number is connect with electronic control system 5, the fuel oil of flow control and measurement module A outputs enters finally by system oil return pipe 15 to be fired
Fuel tank 2.Temperature measurement module 13 measures the surface temperature being tested when flow-limiting valve 12 works in real time, and being tested flow-limiting valve 12 by measurement works
When temperature rise the closing discharge characteristic of slope and tested flow-limiting valve and carry out comprehensive descision and be tested whether flow-limiting valve meets the requirements, realize quilt
Survey the diagnosis detection of flow-limiting valve.
As shown in Fig. 2, the flow control and measurement module A include multiple flow diverter valves 31, wherein I, II, III and IV
Corresponding cylinder position is respectively represented, flow diverter valve 31 is used for for switching flux and flow direction, flow switching and measuring unit 31
Realize that the acquisition of 34 signal of action control and flow sensor of flow diverter valve 31, flow switching and measuring unit 32 are connected to
Electronic control system 5.The fuel oil of P mouthfuls of flow diverter valve out is connected to flow sensor 34 after being vented oil catcher 33, real
The measurement of existing flow, the flow that flow sensor 34 exports enter multichannel oil catcher 35, enter finally by system oil return pipe 15
Fuel tank 2.When flow is measured without flow sensor 34, the flow of T mouthfuls of flow diverter valve out is directly entered multichannel collection
Oily device 35 exports after converging and is connected to system oil return pipe 15 into fuel tank 2.
As shown in Fig. 2, flow diverter valve 31 is defaulted as normally open position, that is, the flow for being tested flow-limiting valve 12 commutates through inflow-rate of water turbine
The A mouths of valve 31 input, via T mouthful outputs to multichannel oil catcher 35, be tested under default situations the flow of the output of flow-limiting valve 12 without
Overcurrent quantity sensor 34, the i.e. measurement without being tested 12 output flow of flow-limiting valve；It is surveyed when to carry out 12 flow of tested flow-limiting valve
When amount, here by taking No. I position as an example, electronic control system 5 sends out control signal, and real by flow switching and measuring unit 32
The control of existing No. I bit traffic reversal valve, at this time flow diverter valve action are connected P mouthfuls to close T mouthfuls, are at this moment inputted from A mouthfuls
Flow-limiting valve flow by P mouthfuls enter be vented oil catchers 33, subsequently into flow sensor 34 carry out flow measure in real time, together
When, to improve the precision and stability of flow measurement, there is exhaust oil catcher 33 pipeline degassing function, concrete structure to see Fig. 3.
As shown in figure 3, the exhaust oil catcher 33 is divided into oil inlet area and fuel-displaced area, intermediate bulkhead 41 by intermediate bulkhead 41
Top has the gap 40, and the liquid in oil inlet area flows into fuel-displaced area by gap 40.E is oil inlet in Fig. 3, and F is oil outlet, wherein into
Hydraulic fluid port E prevents oil inlet from mixing and drawing with air in the bottom of exhaust oil catcher 33, oil inlet E less than liquid level in actual work
Enter gas.Oil outlet F can shorten on 33 top of exhaust oil catcher when the not oil inlet of oil inlet area, and the liquid of fuel-displaced area's storage continues
The time to form flow is flowed out from oil outlet F.Peak has exhaust outlet 42 above oil inlet area, and pressure row is equipped on exhaust outlet 42
Air valve 43, by pressure exhaust valve 43 after fuel oil flows into oil inlet area, due to the buoyancy of air, gas gradually rises to row
The peak of gas oil catcher 33, when pressure reaches limit value, pressure exhaust valve 43 automatically opens, and gas is released by exhaust outlet 42,
And pressure exhaust valve 43 is automatically closed when gas pressure is less than limit value, so that it is guaranteed that the gas in exhaust oil catcher 33 is arranged in time
Go out, reduces the risk that gas is mixed into fluid, improve the stability and precision of flow measurement.
It is illustrated in figure 4 the discharge characteristic table of electric-controlled fuel injector 8, for batch production and electronic control injection of good performance
Device, the relationship between injection pressure, driving time and flow as shown on the graph in fig. 4, i.e., in uniform pressure, get over by driving time
Long, flow is bigger, and in identical driving time, injection pressure is higher, and flow is bigger.
For actual electric-controlled fuel injector, since its inside is the electromagnetism, fluid power, mechanical mechanism of complexity, with work
Make the passage of time, aging, drift can occur for basic performance, to ensure the consistency and stability of flow-limiting valve flow detection,
Electric-controlled fuel injector performance in diagnosis detection device as throttling action should be consistent.Therefore, it is surveyed for guarantee current limliting valve performance
That tries is accurate and reliable, is periodically calibrated to electric-controlled fuel injector, after diagnosing detection device stabilization, passes through flow shown in Fig. 2
Switching and measuring unit 32 test each electric-controlled fuel injector 8 setting pressure and flow under the conditions of driving time respectively, and according to
The difference of flow is modified, and is only analyzed for driving time t with spraying pressure P1 here, the automatically controlled spray for ideal characterisitics
Oily device, flow at this time are q, i.e. in Fig. 4 shown in A points；After electric-controlled fuel injector aging changes, if setting pressure P1, when driving
Between t when actual test flow be q', it is assumed here that in q'＞ q, i.e. Fig. 4 shown in A' points, then injection pressure P1 characteristic curves
The driving time that upper interpolation corresponds to flow q' is t', as shown in B points in Fig. 4, calculates the time difference Δ t of 2 points of A, B.
Δ t=t'-t (1)；
Time difference Δ t is the compensation for calibrating errors value of electric-controlled fuel injector, due to the actual flow characteristic q' of the electric-controlled fuel injector
Higher than theoretical delivery q, therefore, using the time after deduction Δ t as practical driving time when electronic control system 5 drives, thus
Correct the increased flow of electric-controlled fuel injector, it is ensured that actual flow is consistent with theoretical characteristics.When the actual flow of electric-controlled fuel injector is small
In theoretical characteristics flow, i.e. q'＜ q can be analyzed similarly, and unique difference, which is exactly practical driving time at this time, should increase Δ t.Profit
With this method periodic calibration electric-controlled fuel injector, and update after calibration test the compensation for calibrating errors value Δ t of corresponding fuel injector, it is ensured that limit
Electric-controlled fuel injector performance is consistent used in stream valve test, ensures the accuracy of flow-limiting valve performance test, avoids due to electric-controlled fuel injector
Flow performance difference and the difference for causing current limliting valve test.
It is that flow-limiting valve closes the temperature integrated instrumentation plan of flow to be illustrated in figure 5, and diagnosis detection device is full by temperature control
Sufficient test condition is the initial point of test, i.e. 0 point of testing time, is then run to time t according to preset operating mode1, simultaneously
0~t of record in real time1The temperature of period flow-limiting valve, it is assumed that t1The temperature of moment flow-limiting valve is T1, P points are corresponded to, it is normal for function
Flow-limiting valve, in 0~t1The temperature rise curve of period should within the limits prescribed, i.e., temperature change has to comply with certain rule,
For the rule by being determined after normally functioning flow-limiting valve test calibration, specific temperature rise curve limit value is as shown in Figure 6；Hereafter diagnosis inspection
Device is surveyed to run to time t according to setting operating mode2Start the throttle-flow for being stepped up electric-controlled fuel injector by setting interval, clocks
Between t2The temperature of moment flow-limiting valve is T2, corresponding Q points, with flow-limiting valve incrementally increasing by flow, if reaching t3Moment current limliting
Valve events are closed, and the temperature of flow-limiting valve is T at this time3, corresponding R points, it is as follows that note temperature rises slope K：
Then in the t of flow-limiting valve testing process3Moment, except record flow-limiting valve closes flow qcloseRefer to as important detection
Mark closes flow qcloseMust be outer within the limits prescribed, while also analysis temperature rises slope K whether in prescribed limit, when
It when flowing valve internal leakage or dumb movement, may determine that by temperature anomaly, therefore, rise slope K using temperature and can determine whether current limliting
Valve internal leakage or the dumb failure of movement, and such failure only closes flow q by flow-limiting valvecloseAnalysis can not effectively sentence
It is disconnected.Therefore, the closing discharge characteristic of slope and flow-limiting valve is risen come comprehensive descision flow-limiting valve by temperature when measuring flow-limiting valve work
Performance, the various fault types of flow-limiting valve can be analyzed more fully hereinafter, it is ensured that flow-limiting valve detection accuracy and reliability.
Note closes the duration that flow rate test time started to flow-limiting valve is closed as Δ t2, as follows：
Δt2=t3-t2(3)；
If during the test from t2Moment, by tlmtFlow-limiting valve is still not turned off, i.e., when system reaches regulation flow
The still not operating closing of flow-limiting valve, then be judged as flow-limiting valve failure, wherein tlmtIt is by the determining flow-limiting valve testing time ginseng of calibration
Number, parameter tlmt＞ Δs t2.Wherein time t1、t2And t3It is according to the determining parameter of actual conditions calibration, temperature T1、T2And T3
It is obtained by practical measurement.
It is illustrated in figure 6 flow-limiting valve temperature rise curve schematic diagram, abscissa is the testing time in the figure, and ordinate is flow-limiting valve
The normal flow-limiting valve of surface temperature value, i.e. performance, as flow is also increased by flow-limiting valve surface temperature, if certain is former
Because as flow-limiting valve is stuck do not work when, due to there is no flow to pass through, then temperature be basically unchanged or rises it is very slow, at this point, to correspondence when
The temperature value at quarter is lower than lower limiting value；If certain reason such as flow-limiting valve internal leakage, temperature rise is violent, corresponds to the moment at this time
Temperature value is higher than upper limit value, therefore, by the temperature value and the upper limit, the relationship of lower limiting value of corresponding moment current limliting valve surface, can determine
Property judge whether current limliting valve performance normal, further carry out that temperature rises slope and flow-limiting valve closes the comprehensive of discharge characteristic to be follow-up
It closes analysis tentatively to be judged, flow-limiting valve temperature upper limit value and lower limit value is analyzed true by the normal flow-limiting valve test statistics of performance in Fig. 6
It is fixed.
It is illustrated in figure 7 flow-limiting valve diagnostic test flow：
Step S10：System initialization completes system, the self-diagnostic function of sensor；
Step S20：Information input is tested, the relevant information for being tested flow-limiting valve is inputted, such as product type, sequence number, test
Personnel etc.；
Step S30：Testing stand controls dataphone, i.e. electronic control system is established with testing stand control computer and communicated, etc.
The input of to be tested control computation instruction；
Step S40：It receives test instruction to judge, that is, judges whether that being properly received the test that testing stand control computer is sent refers to
It enables, returning to step S30 if not receiving instruction continues waiting for；If being properly received the test that testing stand control computer is sent to refer to
It enables, enters step S50；
Step S50：Tank temperature measures, that is, acquires testing stand tank temperature value；
Step S70：Judge whether tank temperature meets setting value, if meeting setting value, program enters next step, instead
If tank temperature do not meet setting value, enter temperature control step S60, i.e., cooled down when temperature is high, it is big negative if temperature is low
Lotus runs Electrocontrolled high-pressure common rail fuel injection system and improves fuel oil temperature, then measures and judges into trip temperature again, until oil
Box temperature degree is in range of set value；
Step S80：Judge whether to need to carry out electric-controlled fuel injector calibration, since the nominal time of electric-controlled fuel injector is longer,
Can be set according to actual conditions electric-controlled fuel injector calibration rule, such as work the stipulated time or test specified quantity flow-limiting valve
Deng, therefore step S80 judges whether the calibration condition for meeting electric-controlled fuel injector, and automatically controlled spray is carried out if meeting and entering step S85
Oily device flow calibration, electric-controlled fuel injector discharge characteristic table of the specific calibration process according to Fig. 4 execute；
Step S90：Flow correction is carried out to electric-controlled fuel injector according to the result of flow calibration.If step S80 judgements are not required to
Electric-controlled fuel injector flow calibration is carried out, then enters step S100 and carries out flow-limiting valve temperature measurement, i.e., according to shown in Fig. 5, is utilized
Temperature measurement module measures 0~t1The surface temperature of time flow-limiting valve, step S110 be temperature curve judge, the step mainly according to
Temperature rise curve shown in fig. 6 judged whether within the preset range to judge Wen Sheng, if not within the limits prescribed,
It then enters step to test after S130 output reports and terminate；If Wen Sheng within the limits prescribed, enters step S120 and carries out current limliting
Valve closes flow measurement, i.e. system is run according to setting operating mode to time t2Start to be stepped up electric-controlled fuel injector at regular intervals
Throttle-flow, if reach t3Moment current limliting valve events close, and according to formula (2) calculate K values, and judge close flow whether
In the range of regulation, step S130 generates corresponding test report, including test information data, tests whether qualification etc., generates
This current limliting valve test terminates after test report, stores corresponding test result, and waits for test instruction next time.
Above-described specific implementation mode, including cited flow diagram are held and claim institute within the present invention
Can be there are many variations and modifications, therefore in the range of covering, the embodiment described, which is not constituted, protects the claims in the present invention
The limitation of range.
Claims (6)
1. a kind of high-pressure common-rail pipe flow-limiting valve diagnoses detection device, it is characterized in that：Including by fuel tank（2）, high-pressure oil pump（4）、
High-pressure oil pipe（6）, high-pressure common-rail pipe（7）, pressure sensor（10）, pressure safety valve（11）, tested flow-limiting valve（12）, pressure peace
Full valve oil return pipe（14）, system oil return pipe（15）And electronic control system（5）The Electrocontrolled high-pressure common rail fuel injection system of composition,
Fuel tank（2）Pass through high-pressure oil pump（4）And high-pressure oil pipe（6）Connect high-pressure common-rail pipe（7）, high-pressure common-rail pipe（7）Upper setting pressure
Force snesor（10）, high-pressure common-rail pipe（7）Pressure relief opening be arranged pressure safety valve（11）And pass through pressure safety valve oil return pipe
（14）With fuel tank（2）Connection, high-pressure common-rail pipe（7）High pressure oil export installation be tested flow-limiting valve（12）, it is tested flow-limiting valve
（12）Pass through electric-controlled fuel injector（8）And defogger（9）Connect flow control and measurement module（A）, flow control and measurement module
（A）Pass through system oil return pipe（15）Connect fuel tank（2）；The electric-controlled fuel injector（8）Control signal and electronic control system
（5）Real-time communication is tested flow-limiting valve（12）Side install temperature measurement module（13）, temperature measurement module（13）Signal connect electronics control
System processed（5）, flow control and measurement module（A）Signal and electronic control system（5）Connection, flow control and measurement module
（A）The fuel oil of output passes through system oil return pipe（15）Into fuel tank（2）.
2. high-pressure common-rail pipe flow-limiting valve as described in claim 1 diagnoses detection device, it is characterized in that：The flow control and survey
Measure module（A）Including multiple flow diverter valves（31）, flow diverter valve（31）With flow switching and measuring unit（32）Connection with
Realize flow diverter valve（31）Action control, flow switching and measuring unit（32）It is connected to electronic control system（5）；It is described
Flow diverter valve（31）P mouths through be vented oil catcher（33）After be connected to flow sensor（34）, flow sensor（34）It is defeated
Outlet connects multichannel oil catcher（35）, multichannel oil catcher（35）Connection passes through system oil return pipe（15）Connect fuel tank（2）；It is described
Flow diverter valve（31）T mouths connect multichannel oil catcher（35）.
3. high-pressure common-rail pipe flow-limiting valve as claimed in claim 2 diagnoses detection device, it is characterized in that：The exhaust oil catcher
（33）By intermediate bulkhead（41）It is divided into oil inlet area and fuel-displaced area, intermediate bulkhead（41）Top has the gap（40）, the liquid in oil inlet area
Body passes through gap（40）Flow into fuel-displaced area；In exhaust oil catcher（33）Bottom be arranged oil inlet（E）, oil inlet（E）Less than reality
Liquid level when border works；In exhaust oil catcher（33）Oil outlet is set（F）；Peak is equipped with exhaust outlet above the oil inlet area
（42）, exhaust outlet（42）On pressure exhaust valve is installed（43）.
4. high-pressure common-rail pipe flow-limiting valve as described in claim 1 diagnoses detection device, it is characterized in that：In the high-pressure common-rail pipe
（7）Each high pressure oil export installation be tested flow-limiting valve.
5. a kind of high-pressure common-rail pipe flow-limiting valve diagnosis detecting method, characterized in that using according to any one of claims 1-4
Diagnosis detection device is detected, and is included the following steps：
（1）Carry out system temperature control, after fuel tank temperature reaches setting value temperature control terminate；
（2）After reaching set-point temperature, current limliting valve test is carried out, surface temperature changes with time song when measuring flow-limiting valve work
Whether within the preset range line judges Wen Sheng, and the tentative diagnosis that current limliting valve performance is carried out according to temperature curve detects；
（3）The measurement that flow-limiting valve closes discharge characteristic is carried out, and combines the Wen Sheng preset when flow-limiting valve work in the time, is sentenced
It is disconnected whether within the limits prescribed to close flow, with the performance of comprehensive descision flow-limiting valve.
6. high-pressure common-rail pipe flow-limiting valve diagnosis detecting method as claimed in claim 5, it is characterized in that：The detection method is also wrapped
The step of including calibration electric-controlled fuel injector：The flow of periodic measurement electric-controlled fuel injector calibrates electric-controlled fuel injector by flow
Compensation.
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