CN106777661A - A kind of diesel engine electric-controlled oil ejector accelerated factor interval determination method based on life-span theoretical calculation - Google Patents
A kind of diesel engine electric-controlled oil ejector accelerated factor interval determination method based on life-span theoretical calculation Download PDFInfo
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Abstract
The present invention provides a kind of diesel engine electric-controlled oil ejector accelerated factor interval determination method based on life-span theoretical calculation, including：Step one, Analysis on Mechanism, determine all minimum indenture level unit life cycle managements of diesel engine electric-controlled oil ejector potentially consume type failure mechanism and its sensitive stress.Step 2, weak link determine.Step 3, the analysis of failure mechanism acceleration.Step 4, damage measurement.Step 5, loading spectrum equivalent analysis.Step 6, accelerated test loading spectrum determine.Step 7, unit accelerated factor are interval to be determined.Step 8, the interval determination of product synthesis accelerated factor.The present invention is based on life-span computation model, determine to provide solution route for the diesel engine electric-controlled oil ejector accelerated factor for considering model parameter uncertainty influence and many failure mechanism synergies of many stress is interval, for the reliability demonstration with long-life index product provides method support.
Description
Technical field
The invention belongs to accelerated life test design field, and in particular to a kind of diesel engine electric based on life-span theoretical calculation
Control fuel injector accelerated factor interval determination method.
Background technology
Diesel engine electric-controlled oil ejector is most critical and most complicated part in joint-track type fuel system, its effect according to
The control signal that ECU sends, by controlling the opening and closing of magnetic valve, the fuel oil in high pressure oil rail is determined with optimal oil spout
When, distributive value and fuel injection rate spray into the combustion chamber of diesel engine.Often set diesel engine electric-controlled oil ejector is by pintle nozzle match-ing parts, control plunger group
Seven subsystem compositions such as part, ball valve assembly, armature component, coil block, oil injector body component and oil-feed Pipe joint assembly.
Diesel engine electric-controlled oil ejector belongs to the product of long-life index, because its price is high, it is difficult to by increasing sample size
To reduce test period, test period can only be reduced by improving proof stress level, so as to reduce cost；However, diesel oil
Electrical Control fuel injector working environment is more complicated, and its failure is by the coefficient result of multiple failure mechanisms so that accelerate because
Son is difficult to determine.At present, many stress accelerated life tests are built upon on the basis of statistics, using assuming product life distribution
Method determines the accelerated factor of product accelerated life test, and the specifying information demand to product is less, but needs substantial amounts of sample
Tested, the diesel engine electric-controlled oil ejector few for expensive and quantity is difficult to launch.Determine for based on mechanism model
The method of accelerated factor, is only applicable to unit reason single stress condition, not the complete consideration many mechanism of many stress at present
Under the conditions of method is determined based on the accelerated factor of Top-Down Design.
Based on the present situation, the present invention proposes a kind of diesel engine electric-controlled oil ejector accelerated factor area based on life-span theoretical calculation
Between determine method, it is contemplated that model parameter uncertainty influences and many stress many failure mechanisms synergy, is able to verify that existing
The acceleration of the accelerated test loading spectrum based on experience and guides designer to be modified, while providing accelerated test loading spectrum
The implementation of accelerated life test is instructed, the final comprehensive accelerated factor for determining diesel engine electric-controlled oil ejector is interval.
The content of the invention
In order to overcome the defect of prior art, it is an object of the invention to provide a kind of diesel oil based on life-span theoretical calculation
Electrical Control fuel injector accelerated factor interval determination method.
Specifically, the present invention provides a kind of diesel engine electric-controlled oil ejector accelerated factor interval based on life-span theoretical calculation really
Determine method, it is comprised the following steps that：
Step one：Analysis on Mechanism：Determine in all minimum indenture level unit life cycle managements of diesel engine electric-controlled oil ejector
Potential consume type failure mechanism and its sensitive stress；
Step 2：Weak link determines：The consume type failure mechanism according to determined by step one, chooses corresponding life-span meter
Model is calculated, damage and theoretical life-span of each consume type failure mechanism under routine test loading spectrum is calculated, so that it is determined that weak
Link and main frame are managed；
Step 3：Failure mechanism acceleration is analyzed：On the basis of weak link determined by step 2 and main frame reason, profit
Use life-span computation model, the acceleration of analysis respective hosts reason；
Step 4：Damage measurement：On the premise of model parameter dispersiveness is considered, to the existing accelerated test based on experience
Loading spectrum carries out damage measurement；
Step 5：Loading spectrum equivalent analysis：On the basis of step 3, disperseed in different model parameters by comparing calculation
Property under, each main frame reason is analyzed existing based on warp in the damage ratio of existing accelerated test loading spectrum similarly hereinafter routine test loading spectrum
The accelerated test loading spectrum and the equivalence of routine test loading spectrum tested；
Step 6：Accelerated test loading spectrum determines：Based on routine test loading spectrum and the existing accelerated test based on experience
Section, determines accelerated test loading spectrum；
Step 7：Unit accelerated factor is interval to be determined：On the basis of life-span computation model parameters decentralization is considered, utilize
Life-span computation model, calculates the accelerated factor interval of each main frame reason under accelerated test loading spectrum, so that it is determined that unit
Accelerated factor is interval；
Step 8：Product synthesis accelerated factor determines：It is interval according to the unit accelerated factor that step 7 determines, determine diesel oil
The comprehensive accelerated factor of Electrical Control fuel injector is interval.
Preferably, the Analysis on Mechanism described in step one specifically includes following steps：
A. according to given loading spectrum or mission profile, composition, structure with reference to diesel engine electric-controlled oil ejector, principle are led to
Development STRUCTURE DECOMPOSITION is crossed, the minimum indenture level unit of product is determined；
B. the local load suffered by each minimum indenture level unit is determined according to loading spectrum, so as to analyze corresponding institute
Possible consume type failure mechanism；
C. the sensitive stress of each consume type failure mechanism is determined.
Preferably, the weak link described in step 2 be the theoretical calculation life-span less than 100 times of index of aging it is minimum about
Given layer sub-cell；
Preferably, the main frame reason described in step 2 is the corresponding consume type played a crucial role to life of product of weak link
Failure mechanism.
Preferably, the determination method of the main frame reason is specifically included：
For the mechanism of fatigue, focal selection times of fatigue allowable is less than 1010Secondary corresponding consume type failure mechanism；
For abrasion mechanism, choose wear extent and be more than the corresponding consume type failure mechanisms of 0.02mm；
For agine mechaism, choose aging life-span and be less than the corresponding consume type failure mechanisms of 10000h.
Preferably, what the failure mechanism acceleration described in step 3 was analyzed comprises the following steps that：
A. the limit allowable stress that the failure mechanism corresponding unit is born is determined；
B. the limit allowable stress that will be determined substitutes into life-span computation model, obtains the theoretical life-span under the stress level；
C. the ratio in the theoretical life-span under calculating limit stress level and the theoretical life-span under routine test loading spectrum, judges
Whether the failure mechanism has acceleration.If life-span ratio is more than 2, then it is assumed that the mechanism possesses acceleration.
Preferably, damage measurement described in step 4 is comprised the following steps that：
A. for the reason of the main frame with acceleration determined in step 3, calculated existing using corresponding life-span computation model
There is the damage under accelerated test loading spectrum；
B. consider that the model parameter chosen has dispersiveness, set the coefficient of dispersion as 20%, calculate respectively in different models
The corresponding injury interval of each main frame reason under parameters decentralization.
Preferably, the loading spectrum equivalent analysis specific method described in step 5 is：
If main frame reason is damaged during than more than 1, there is acceleration in existing accelerated test loading spectrum for main frame reason；
If main frame reason is damaged than being less than 1, existing accelerated test loading spectrum does not exist acceleration for main frame reason.
Preferably, the determination accelerated test loading spectrum specific method described in step 6 is：Ensureing accelerated test operating mode
In the case of constant, according to routine test loading spectrum with the ratio between the total testing time of accelerated test loading spectrum, existing acceleration is adjusted
Test load composes the test period under each operating mode so that the overall test of total testing time and routine test loading spectrum after adjustment
Time consistency.
Preferably, described in step 7 determining unit accelerated factor interval specific method be each main frame manage accelerate because
On the basis of subinterval determines, the accelerated factor conduct of minimum in the corresponding All hosts reason accelerated factor interval of the unit is chosen
The accelerated factor of unit is interval.
Preferably, fixed output quota product synthesis accelerated factor interval specific method is really described in step 8, true according to step 2
The theoretical arranging in lifetime result of each fixed minimum indenture level unit, chooses most short minimum indenture level unit of theoretical life-span
The interval comprehensive accelerated factor as diesel engine electric-controlled oil ejector of corresponding accelerated factor is interval.
The present invention is a kind of diesel engine electric-controlled oil ejector accelerated factor interval determination method based on life-span theoretical calculation, tool
Have the advantage that：
The invention provides a kind of diesel engine electric-controlled oil ejector accelerated factor interval determination side based on life-span theoretical calculation
Method, considers the synergy of model parameter uncertainty and many failure mechanisms of many stress comprehensively, and assessment result more accurately may be used
Letter.
The invention provides it is a set of based on life-span computation model from mechanism-unit-product accelerated factor from bottom to top
Interval determination method, the fault observer of full cognizance product, it is determined that accelerated life test plan more conform to the reality of product
Border situation.
Need to determine accelerated factor method by great amount of samples instant invention overcomes accelerated test of the tradition based on statistics
Deficiency, reduces test sample and experimentation cost, for the verification experimental verification with long-life index product provides method support.
Brief description of the drawings
Fig. 1 is present invention determine that method flow diagram；And
Fig. 2 is certain diesel engine electric-controlled oil ejector STRUCTURE DECOMPOSITION hierarchy chart.
Specific embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail：
Specifically, the present invention provides a kind of diesel engine electric-controlled oil ejector accelerated factor interval based on life-span theoretical calculation really
Determine method, it is comprised the following steps that：
Step one：Analysis on Mechanism：
Determine potential consume type failure in all minimum indenture level unit life cycle managements of diesel engine electric-controlled oil ejector
Mechanism and its sensitive stress.
Described " Analysis on Mechanism " includes three steps：1) according to given loading spectrum or mission profile, with reference to diesel engine
The composition of electric-controlled fuel injector, structure, principle, by carrying out STRUCTURE DECOMPOSITION, determine the minimum indenture level unit of product；2) foundation
Loading spectrum determines the local load suffered by each minimum indenture level unit, so as to analyze corresponding all possible consume type
Failure mechanism.3) sensitive stress of each consume type failure mechanism is determined.
Step 2：Weak link determines：
The consume type failure mechanism according to determined by step one, chooses corresponding index of aging computation model, calculates each
Damage and theoretical life-span of the failure mechanism under routine test loading spectrum, so that it is determined that weak link and main frame reason.
Described " weak link " refers to the minimum indenture level list of 100 times of theoretical calculation life-span less than index of aging
Unit.
Described " main frame reason " refers to the corresponding consume type failure mechanism played a crucial role to life of product of weak link.
1) for the mechanism of fatigue, focal selection times of fatigue allowable is less than 1010Secondary corresponding consume type failure mechanism；2) for abrasion machine
Reason, chooses wear extent and is more than the corresponding consume type failure mechanisms of 0.02mm；3) for agine mechaism, choose aging life-span and be less than
The corresponding consume type failure mechanisms of 10000h.
Step 3：Failure mechanism acceleration is analyzed：
On the basis of weak link determined by step 2, using index of aging computation model, analysis respective hosts reason
Acceleration.
What described failure mechanism acceleration was analyzed comprises the following steps that：
A. the limit allowable stress that the failure mechanism corresponding unit is born is determined；
B. the limit allowable stress that will be determined substitutes into life-span computation model, obtains the theoretical life-span under the stress level；
C. the ratio in the theoretical life-span under calculating limit stress level and the theoretical life-span under routine test loading spectrum, judges
Whether the failure mechanism has acceleration.If life-span ratio is more than 2, then it is assumed that the mechanism possesses acceleration.
Step 4：Damage measurement：
On the premise of model parameter dispersiveness is considered, damage meter is carried out to the existing accelerated test loading spectrum based on experience
Calculate.
Described damage measurement is concretely comprised the following steps：1) for the reason of the main frame with acceleration determined in step 3, profit
The damage under existing accelerated test loading spectrum is calculated with corresponding life-span computation model；2) consider that the model parameter chosen is present
Dispersiveness, sets the coefficient of dispersion as 20%, and the corresponding damage of each main frame reason under different model parameters dispersiveness is calculated respectively
Wound is interval.
Step 5：Loading spectrum equivalent analysis：
On the basis of step 3, by comparing calculation under different model parameters dispersiveness, each main frame is managed existing
The damage ratio of accelerated test loading spectrum similarly hereinafter routine test loading spectrum, analyze the existing accelerated test loading spectrum based on experience with it is normal
The equivalence of rule test load spectrum.
Described " loading spectrum equivalent analysis " principle is：If main frame reason is damaged during than more than 1, existing accelerated test
There is acceleration for main frame reason in loading spectrum；If main frame reason damage than be less than 1, existing accelerated test loading spectrum for
Main frame reason does not exist acceleration.
Step 6：Accelerated test loading spectrum determines：
Based on routine test loading spectrum and the existing accelerated test section based on experience, accelerated test loading spectrum is determined.
The criterion of described " determination of accelerated test loading spectrum " is：In the case where ensureing that accelerated test operating mode is constant, according to
According to routine test loading spectrum with the ratio between the total testing time of accelerated test loading spectrum, existing each work of accelerated test loading spectrum is adjusted
Test period under condition so that the total testing time after adjustment is consistent with the total testing time of routine test loading spectrum.
Step 7：Unit accelerated factor is interval to be determined：
On the basis of life-span computation model parameters decentralization is considered, using life-span computation model, calculate accelerated test and carry
The accelerated factor of lower each main frame reason of lotus spectrum is interval, so that it is determined that the accelerated factor of unit is interval.
Described " unit accelerated factor is interval to be determined " is the choosing on the basis of the interval determination of reason accelerated factor of each main frame
The accelerated factor for taking minimum in the corresponding All hosts reason accelerated factor interval of the unit is interval as the accelerated factor of unit.
Step 8：Product synthesis accelerated factor is interval to be determined：
It is interval according to the unit accelerated factor that step 7 determines, determine the comprehensive accelerated factor area of diesel engine electric-controlled oil ejector
Between.
Described " product synthesis accelerated factor is interval to be determined " specific method is that each according to step 2 determination is minimum about
The theoretical arranging in lifetime result of given layer sub-cell, chooses the most short corresponding accelerated factor of minimum indenture level unit of theoretical life-span
The interval comprehensive accelerated factor as diesel engine electric-controlled oil ejector is interval.
Embodiment
Below in conjunction with specific certain diesel engine electric-controlled oil ejector accelerated factor interval determination process the present invention is done into
The detailed description of one step, is shown in Fig. 1, and the present invention is a kind of diesel engine electric-controlled oil ejector accelerated factor area based on life-span theoretical calculation
Between determine method, its invention specific implementation step it is as follows：
Step one：Analysis on Mechanism is carried out, diesel engine electric-controlled oil ejector all minimum weeks indenture level unit life-cycle are determined
Potential consume type failure mechanism and its sensitive stress in phase.Hierarchy chart after certain diesel engine electric-controlled oil ejector STRUCTURE DECOMPOSITION, is shown in
Shown in Fig. 2.Determining the service load type of minimum indenture level unit has：Stroke, fuel pressure, load force, working media temperature
Degree, environmental load type has：Environment temperature, oscillating load.The final consume type failure mechanism summary sheet for determining is as shown in table 1.
Table 1 certain diesel engine electric-controlled oil ejector failure mechanism summary sheet
Step 2：Weak link determines.The consume type failure mechanism according to determined by step one, chooses corresponding life-span meter
Model is calculated, damage and theoretical life-span that each failure mechanism (is shown in Table 2) under routine test loading spectrum is calculated, so that it is determined that
Weak link and main frame are managed.
Table 2 certain diesel engine electric-controlled oil ejector routine test loading spectrum
Carrying out the common life-span computation model needed for index is calculated includes：
A. tired class mechanism：
The life-span computation model of tired class failure mechanism is shown below：
Wherein, σmax,σmin--- maximum stress and minimum stress in certain one period of motion of minimum indenture level unit,
MPa；
σm,σa--- corresponding mean stress and stress amplitude, MPa in certain one period of motion of minimum indenture level unit；
σe--- average eguivalent stress, MPa；
σb, --- the tensile strength of material limit, MPa；
σ-1A--- fatigue limit allowable, MPa；
The endurance ratio of b --- material；
Ni,Di--- fatigue life and damage under load at different levels；
N0--- cycle-index when maximum principal stress is fatigue limit；
ni,Ni--- actual cycle number of times and fatigue life under load at different levels；
Fatigue life under L --- integrated condition；
B. wear and tear class mechanism：
The life-span computation model of class failure mechanism of wearing and tearing is shown below：
A=2 π rLj
Wherein：R --- friction pair internal diameter, mm；
Lj--- friction pair contact portion length, mm；
A --- nominal contact area, mm2；
hs--- the maximum allowable wear extent of friction pair, mm；
H --- material hardness, MPa；
K --- the coefficient of waste；
Lm--- friction pair full stroke length, mm；
Wa--- micro-bulge load, N；
N --- wear-out life；
C. aging class mechanism：
The life-span computation model of aging class failure mechanism is shown below：
Wherein：The activation energy of E --- material, J*mol-1；
R --- gas constant, 8314/ (J*mol-1)；
T --- the aging reaction time, K；
T --- aging life-span, h；
The theoretical life-span of each the minimum indenture level unit for obtaining is calculated by life-span computation model, as shown in table 3.
The corresponding theoretical life-span summary sheet of the consume type failure mechanism of table 3
For the mechanism of fatigue, focal selection times of fatigue allowable is less than 1010Secondary consume type failure mechanism；For abrasion machine
Reason, chooses consume type failure mechanism of the wear extent more than 0.02mm；For agine mechaism, choose aging life-span and be less than 10000h's
Consume type failure mechanism.The final weak link chosen and main frame reason are as shown in table 4.
The diesel engine electric-controlled oil ejector weak link of table 4 and main frame reason summary sheet
Step 3：Failure mechanism acceleration is analyzed.On the basis of weak link determined by step 2, counted using the life-span
Calculate model, the acceleration of analysis respective hosts reason.Finally, all failure mechanisms with acceleration are shown in Table 5.
Table 5 has the failure mechanism summary sheet of acceleration
Step 4：Damage measurement.On the premise of model parameter dispersiveness is considered, to the existing accelerated test based on experience
Loading spectrum (being shown in Table 6) carries out damage measurement.
The existing accelerated test loading spectrum of certain diesel engine electric-controlled oil ejector of table 6
The dispersiveness of setting model parameter is 20%, it can thus be concluded that the corresponding failure mechanism of unit is in different dispersivenesses
Under the theoretical life-span and damage profile situation.By taking impact fatigue of the needle-valve with welding needle-valve body as an example, the tool of method is illustrated
Body step：
A. needle-valve impact fatigue
In the impact fatigue corresponding theoretical life-span and damage under different model parameters dispersiveness of needle-valve, it is shown in Table 7,8 institutes
Show.
The theoretical life-span of the needle-valve impact fatigue of table 7
The damage of the needle-valve impact fatigue of table 8
| Divergence | b | Routine test loading spectrum | Existing accelerated test loading spectrum |
| - 20% | 2.528 | 1.11 | 0.65 |
| - 10% | 2.844 | 0.79 | 0.48 |
| 0 | 3.16 | 0.56 | 0.35 |
| 10% | 3.476 | 0.39 | 0.25 |
| 20% | 3.792 | 0.28 | 0.18 |
B. needle-valve body impact fatigue is welded
The impact fatigue corresponding theoretical life-span and damage under different model parameters dispersiveness of needle-valve body is welded, is shown in Table
9th, shown in 10.
Table 9 welds the theoretical life-span of needle-valve body impact fatigue
| Divergence | b | Routine test loading spectrum | Existing accelerated test loading spectrum |
| - 20% | 3.91472 | 2.06E+06 | 1.47E+06 |
| - 10% | 4.40406 | 1.68E+06 | 1.16E+06 |
| 0 | 4.8934 | 1.38E+06 | 9.08E+05 |
| 10% | 5.38274 | 1.13E+06 | 7.12E+05 |
| 20% | 5.87208 | 9.21E+05 | 5.58E+05 |
Table 10 welds the damage of needle-valve body impact fatigue
| Divergence | b | Routine test loading spectrum | Existing accelerated test loading spectrum |
| - 20% | 3.91472 | 87.58 | 56.18 |
| - 10% | 4.40406 | 106.95 | 71.56 |
| 0 | 4.8934 | 130.66 | 91.20 |
| 10% | 5.38274 | 159.71 | 116.29 |
| 20% | 5.87208 | 195.34 | 148.34 |
Step 5：Loading spectrum equivalent analysis.On the basis of step 3, disperseed in different model parameters by comparing calculation
Property under, each main frame reason is analyzed existing based on warp in the damage ratio of existing accelerated test loading spectrum similarly hereinafter routine test loading spectrum
The accelerated test loading spectrum and the equivalence of routine test loading spectrum tested.
Comparative analysis ordinary life loading spectrum is obtained in difference compared with the damage of each mechanism under accelerated test loading spectrum
Damage ratio under the value of b, is shown in Table 11.
Damage ratio of each failure mechanism of table 11 under different model parameters dispersiveness
If main frame reason is damaged during than more than 1, there is acceleration in existing accelerated test loading spectrum for main frame reason；
If main frame reason is damaged than being less than 1, existing accelerated test loading spectrum does not exist acceleration for main frame reason.Therefore, it is existing
With the presence of accelerated test loading spectrum only for control plunger, armature and guide way acceleration, cannot be equivalent normal for other units
Rule test load spectrum.
Step 6：Accelerated test loading spectrum determines.Based on routine test loading spectrum and the existing accelerated test based on experience
Section, determines accelerated test loading spectrum, as shown in table 12.
Accelerated test loading spectrum after the adjustment of table 12
Step 7：Unit accelerated factor is interval to be determined.On the basis of life-span computation model parameters decentralization is considered, utilize
Life-span computation model, calculates the accelerated factor interval of each main frame reason under accelerated test loading spectrum, so that it is determined that unit
Accelerated factor is interval, is shown in Table 12.
Accelerated factor of each failure mechanism of table 12 under different parameters dispersiveness
| Ratio | Needle-valve | Welding needle-valve body | Control plunger | Orifice | … | Guide way |
| 0.8 | 1.4038 | 1.5875 | 2.3746 | 1.5177 | … | 2.1488 |
| 0.9 | 1.4349 | 1.6552 | 2.5769 | 1.5685 | … | 2.3241 |
| 1 | 1.4658 | 1.7254 | 2.7873 | 1.6202 | … | 2.5086 |
| 1.1 | 1.4966 | 1.7982 | 3.0043 | 1.6727 | … | 2.7015 |
| 1.2 | 1.5273 | 1.8735 | 3.2264 | 1.7261 | … | 2.9015 |
Step 8：Product synthesis accelerated factor is interval to be determined.According to each minimum indenture level unit that step 2 determines
Theoretical arranging in lifetime result, it is determined that most short minimum indenture level unit of theoretical life-span is welding needle-valve body, corresponding acceleration
It is [1.5875,1.8735] that the factor is interval, and thus the comprehensive accelerated factor as diesel engine electric-controlled oil ejector is interval.
Finally it should be noted that：Above-described each embodiment is merely to illustrate technical scheme, rather than to it
Limitation；Although being described in detail to the present invention with reference to the foregoing embodiments, it will be understood by those within the art that：
It can still modify to the technical scheme described in previous embodiment, or which part or all technical characteristic are entered
Row equivalent；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technical side
The scope of case.
Claims (10)
1. a kind of diesel engine electric-controlled oil ejector accelerated factor interval determination method based on life-span theoretical calculation, it is characterised in that：
It is comprised the following steps that：
Step one：Analysis on Mechanism：Determine potential in all minimum indenture level unit life cycle managements of diesel engine electric-controlled oil ejector
Consume type failure mechanism and its sensitive stress；
Step 2：Weak link determines：The consume type failure mechanism according to determined by step one, chooses corresponding life-span calculating mould
Type, calculates damage and theoretical life-span of each consume type failure mechanism under routine test loading spectrum, so that it is determined that weak link
And main frame reason；
Step 3：Failure mechanism acceleration is analyzed：On the basis of weak link determined by step 2 and main frame reason, using the longevity
Life computation model, the acceleration of analysis respective hosts reason；
Step 4：Damage measurement：On the premise of model parameter dispersiveness is considered, to the existing accelerated test load based on experience
Spectrum carries out damage measurement；
Step 5：Loading spectrum equivalent analysis：On the basis of step 3, by comparing calculation in different model parameters dispersiveness
Under, each main frame reason is analyzed existing based on experience in the damage ratio of existing accelerated test loading spectrum similarly hereinafter routine test loading spectrum
Accelerated test loading spectrum and routine test loading spectrum equivalence；
Step 6：Accelerated test loading spectrum determines：Based on routine test loading spectrum and the existing accelerated test section based on experience,
Determine accelerated test loading spectrum；
Step 7：Unit accelerated factor is interval to be determined：On the basis of life-span computation model parameters decentralization is considered, using the life-span
Computation model, calculates the accelerated factor interval of each main frame reason under accelerated test loading spectrum, so that it is determined that the acceleration of unit
The factor is interval；
Step 8：Product synthesis accelerated factor is interval to be determined：It is interval according to the unit accelerated factor that step 7 determines, determine diesel oil
The comprehensive accelerated factor of Electrical Control fuel injector is interval.
2. it is according to claim 1 based on life-span theoretical calculation diesel engine electric-controlled oil ejector accelerated factor interval determination side
Method, it is characterised in that：Analysis on Mechanism specifically includes following steps described in step one：
A. according to given loading spectrum or mission profile, composition, structure with reference to diesel engine electric-controlled oil ejector, principle, by opening
Exhibition STRUCTURE DECOMPOSITION, determines the minimum indenture level unit of product；
B. the local load for determining suffered by each minimum indenture level unit according to loading spectrum, thus analyze it is corresponding it is all can
The consume type failure mechanism of energy；
C. the sensitive stress of each consume type failure mechanism is determined.
3. it is according to claim 2 based on life-span theoretical calculation diesel engine electric-controlled oil ejector accelerated factor interval determination side
Method, it is characterised in that：Weak link described in step 2 is the minimum about given layer of 100 times of theoretical calculation life-span less than index of aging
Sub-cell；
Main frame reason described in step 2 is the corresponding consume type failure mechanism played a crucial role to life of product of weak link.
4. it is according to claim 3 based on life-span theoretical calculation diesel engine electric-controlled oil ejector accelerated factor interval determination side
Method, it is characterised in that：The determination method of the main frame reason is specifically included：
For the mechanism of fatigue, focal selection times of fatigue allowable is less than 1010Secondary corresponding consume type failure mechanism；
For abrasion mechanism, choose wear extent and be more than the corresponding consume type failure mechanisms of 0.02mm；
For agine mechaism, choose aging life-span and be less than the corresponding consume type failure mechanisms of 10000h.
5. it is according to claim 1 based on life-span theoretical calculation diesel engine electric-controlled oil ejector accelerated factor interval determination side
Method, it is characterised in that：The analysis of failure mechanism acceleration comprises the following steps that described in step 3：
A. the limit allowable stress that failure mechanism corresponding unit is born is determined；
B. the limit allowable stress that will be determined substitutes into life-span computation model, obtains the theoretical life-span under the stress level；
C. the ratio in the theoretical life-span under calculating limit stress level and the theoretical life-span under routine test loading spectrum, judges failure
Whether mechanism has acceleration, if life-span ratio is more than 2, then it is assumed that failure mechanism possesses acceleration.
6. it is according to claim 1 based on life-span theoretical calculation diesel engine electric-controlled oil ejector accelerated factor interval determination side
Method, it is characterised in that：Damage measurement described in step 4 is comprised the following steps that：
A. for the reason of the main frame with acceleration determined in step 3, calculated using corresponding life-span computation model and added existing
Damage under fast test load spectrum；
B. consider that the model parameter chosen has dispersiveness, set the coefficient of dispersion as 20%, calculate respectively in different model parameters
The corresponding injury interval of lower each main frame reason of dispersiveness.
7. it is according to claim 1 based on life-span theoretical calculation diesel engine electric-controlled oil ejector accelerated factor interval determination side
Method, it is characterised in that：The specific method of loading spectrum equivalent analysis described in step 5 is：
If main frame reason is damaged than being more than 1, there is acceleration in existing accelerated test loading spectrum for main frame reason；
If main frame reason is damaged than being less than 1, existing accelerated test loading spectrum does not exist acceleration for main frame reason.
8. it is according to claim 1 based on life-span theoretical calculation diesel engine electric-controlled oil ejector accelerated factor interval determination side
Method, it is characterised in that：Accelerated test loading spectrum described in step 6 determine specific method be：Ensureing accelerated test operating mode not
In the case of change, according to routine test loading spectrum with the ratio between the total testing time of accelerated test loading spectrum, adjust and existing accelerate examination
The test period tested under loading spectrum each operating mode so that during the overall test of total testing time after adjustment and routine test loading spectrum
Between it is consistent.
9. it is according to claim 1 based on life-span theoretical calculation diesel engine electric-controlled oil ejector accelerated factor interval determination side
Method, it is characterised in that：The specific method that unit accelerated factor described in step 7 is interval to be determined be each main frame manage accelerate because
On the basis of subinterval determines, the accelerated factor conduct of minimum in the corresponding All hosts reason accelerated factor interval of the unit is chosen
The accelerated factor of unit is interval.
10. the diesel engine electric-controlled oil ejector accelerated factor based on life-span theoretical calculation according to claim 1 is interval determines
Method, it is characterised in that：The specific method of the interval determination of the synthesis accelerated factor of product described in step 8 is, true according to step 2
The theoretical arranging in lifetime result of each fixed minimum indenture level unit, chooses most short minimum indenture level unit of theoretical life-span
The interval comprehensive accelerated factor as diesel engine electric-controlled oil ejector of corresponding accelerated factor is interval.
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