JB/T 51183-2000 Reliability assessment method, test method, fault classification and judgment rules for injector assembly
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T 51183—2000
Reliability assessment of fuel injector assembly
Evaluation method, test method,
Fault classification and judgment rules
(Internal use)
Published on 2000-03-30
National Bureau of Machinery Industry
Implementation on 2000-10-01
JRITS11S3—200
This standard is a revision of "51183-94 Reliability assessment and evaluation method, test method, fault classification and judgment rules for fuel injector assembly". The original standard was modified during the revision. Compared with JB5118394, this standard has ten major technical changes, such as: canceling the calculation formula of the lower limit of the single-line flow with 9% confidence level when calculating MTB, and changing it to when r=0, MTBF=2nr:
canceling the calculation formula of the single-line flow with 90% confidence level when calculating MTTFF, and changing it to when r=0, and setting MTTFF2nT,
This standard replaces the Appendix A of B51183-94 standard from the date of implementation.
The standard was proposed by the State Technical Committee for Standardization of the State Standardization and the originating unit of the standard is: Wujia Oil Elephant Oil Mouth Research Institute. The drafters of this standard are: Zhang Guorong, Wei Jianfen, this standard: [1991 first issued, 1994 standard number adjusted to H/[51163-State Scope
|Mechanical Industry Standard of the People's Republic of China
Reliability Assessment of Injector Assembly
Evaluation Method, Test Method,
Fault Classification and Judgment Rules
(Internal Use)
JB/T51183—2(KH)
Replacement JB[834
This standard specifies the reliability assessment method, bench test method, fault classification and judgment rules of the injector assembly of small and medium-power diesel engines. This standard specifies the reliability assessment and assessment of the injector assembly of small and medium-power diesel engines. 2 Reference Standards
The provisions contained in a mark constitute the reference of this standard through citation in this standard. When the standard is published, the version referred to is valid. All parties using this standard will consider the possibility of using the latest version of the underlined standard. ti3 257—1994
JB.T 7296—1994
JD/T881B—1998
Light diesel
Diesel engine fuel injection parts
Diesel engine fuel injector assembly technical conditions
JB/T31782000 Synthetic wide training pump assembly can be controlled by constant force method, test method, classification and classification of 3 non-performance indicators
3.1 Flat drop F
Mean fault interval time refers to the time between two adjacent faults of the fuel pedal assembly, calculated by formula (or formula (2): MTB-half-mean or fault interval time, traction test sample number:||tt ||Test end time, h
. 一The total number of faults (except for similar faults) that occur within the test deadline: 一The cumulative working time of the first sample: h.
一Speed coefficient, that is, the total number of spray cycles required for the test oil monitoring system to complete the test: When the test is not accelerated,
When +=, let MTBF-2,T
3.2 The mean working time before each fault (MTTFF) refers to the average working time of the product for each effective wall, calculated according to formula (3) or formula (4). Approved by the State Administration of Machinery Industry on March 30, 2000 and implemented on October 1, 2000
JB/T 51183-2000
MTTFP =
Wherein: MTIFP—mean operating time to first failure, h; -E
—the cumulative working time of the sample vehicle in which the first failure (excluding Class I failure) occurs in the tested sample, h; ()
—the cumulative working time of the first sample vehicle in which no first failure (excluding Class I failure) occurs in the tested sample, h;
—the cumulative working time of the first sample vehicle in which the reliability test is terminated, or the first failure (excluding Class I failure) does not occur in the tested sample, h,
When r, let MTTFF=27.
3.3 Comprehensive evaluation of failure resistance (Q)
refers to the comprehensive evaluation of the failure resistance of the product after the reliability test, calculated according to formula (5). Q-100
Where:
The total number of various types of failures that occur in the sample within the test deadline:
The actual test cut-off time, when using a fast-connection test, is the speed coefficient multiplied by the test cut-off time, h: K-the urgency factor of the first fault, various types of failures The hazard coefficient of the fault is as specified in the table: (5
Workmanship! The sample cumulative working time when the second fault occurs; when the rapid test is adopted, the speed coefficient is multiplied by the cumulative test time, h, table! The hazard of the class fault is calculated according to the coefficient
Serious fault (class]
-toe friction (blood class)
Minor fault (class]
3.4 days, the limit ticket life bzxZ.net
The rate of your improvement is reduced
B. The ultimate life refers to the time when 50% of the products reach the limit state under the specified conditions of use. When statistics are made, the samples are arranged in descending order according to the actual hours of use when they reach the limit state. When n is an odd number, the ultimate life is 1mn. When n is an even number, the ultimate life is [+w+]2. The limit state refers to the state in which the main parts of the injector assembly have been damaged (injector body, etc.) to the point of having no repair value. 4. Reliability measurement or assessment method. The reliability measurement or assessment of the injector assembly shall be carried out through bench test force method and the reliability shall be evaluated. According to the requirements of this standard, the manufacturer shall conduct a user reliability survey. The user reliability survey can be carried out by means of user-designated testing or maintenance and user information feedback to obtain the actual reliability data of the product. 5. Reliability assessment method. 51183—2000
After the product reliability review is completed, calculate the reliability index values of each item. If each index is greater than or equal to the specified value and no fault occurs, it is classified as qualified; otherwise, it is judged as unqualified. 6 Reliability test method
6.1 Test sample
1.1 The injector assembly for reliability test shall comply with the product drawings and relevant technical requirements and be inspected by the factory inspection department. 6.1.2 Samples shall be collected from the warehouse or production site of the production plant, and the sample matrix shall not be less than 10 ... Sampling, no limit on the sample matrix. 6.1.3 Randomly throw out 8 samples, all of which are subjected to feasibility tests. 6.2 Test conditions
6.2.1 In the chamber, the test method is carried out in accordance with JB/T51178. In order to shorten the test time, the indoor bench can be used for double rapid cold drag, and the rapid test can be adopted to ensure that the injection process is normal under normal conditions. The method of accelerating the frequency of the injection can be achieved. 2.2 When testing with the oil quality expert, the speed is based on the injection speed; during the rapid test, the speed of the suction pump of the feasibility test bench is controlled at 1000rimio ±20 rmio.
6.2.3 The test oil shall be the light-dyed oil No. 0 specified in G252: 6.2.4 The temperature variation of the test oil shall be controlled at 40=5%. 6.3 Test conditions
The fuel injection amount of the diesel engine equipped with the product at 120% of the rated power shall be selected as the test condition. 6.4 Test specifications and stage detection
6.4.1 The indoor reliability test of the fuel injection assembly shall be carried out in a timed test mode. The test time shall be determined according to the speed coefficient. It shall ensure that the test cycle is 6×[0\ times! . 6.4.2 During the test, 5 tests shall be carried out at equal intervals. a) During the test, if no permanent damage is found, only the performance items shown in Table 2 shall be tested. If the difference is too large, the injector assembly should be readjusted to the factory requirements and recorded as a performance failure. Table 2
Valve opening, positive force
Spray volume
Injector needle noise is still micro
Late even part tightness
Out of tolerance limit (for the adjustment value of the section) is reduced by more than 2MPB1P, "the two series of injectors are determined separately, the spray is not counted, the thinning core is the whole material, continuous pool filling and extreme judgment The local concentration and the center of the measured area should be pressed down slowly and steadily to allow the fuel to pass through the injector. The injection port is not clear and there is no corresponding fuel injection. During the test period or inspection, if any parts are found to be damaged, they should be replaced and repaired immediately, and the injector assembly should be readjusted according to the factory requirements, and recorded as a component failure.
Fault judgment
7.1 Fault definition
Refers to any phenomenon where the injector assembly and its parts cannot achieve the specified performance or the performance index deteriorates beyond the specified range. 3
7. 1. 1 This fault
JB/T51183-2000
refers to the failure of the injector assembly and its parts to be used under the specified conditions, due to the inherent defects of the technology itself. 1.1.2 Faults
Faults caused by a certain vehicle quality fault or external accidental accidents. 7. 2 Fault classification
According to the severity of the fault, it can be divided into four categories, as shown in Table 3. Table 3
Code
Cause
Major fault
General fault
Minor fault
7.3 Fault occurrence
Critical to the safety of the product or causing serious economic impact on the fuel injector or to reduce certain important indicators to the specified range. It is necessary to pay for maintenance. In a relatively safe environment, 7.3.1 For faults that can be found in time, record their exact occurrence time. 7.3.2 For faults that cannot be found in time, determine their occurrence time according to formula (6). It is known that there are 10 faults in the interval [-, 10 ... A1
Total or 15 examples of injector failure rate are shown in Table A1
Failure mode
Injector performance or needle energy body upgrade type
Injection valve head break
Calculation average body or needle net has a system
Injector body has a pattern
Needle inquiry card
Oil inequality
Quality Xuan Chaowei Amine Brand
Injector body sealing surface increase
Needle Min opening seat force decrease
Nozzle dripping
Calculation of obvious mosquito performance deterioration
The distance is the worst and can be cleaned and restored!
Peas have oil biased parts and the surface density has changed. The spray Oil separator assembly seal is completely poor
JBT51183-2000
Attached scene most A
【Appendix of prompt】
Oil separator assembly failure mode
Performance determination points, oil will not be decomposed
Mass is greater than 0.05mm
Exceed 2MPa/P, two series of injectors are determined) for test monitoring and inspection according to R818-1998, within the test force, dismantle and upgrade JD/T7296 sequence.
Low TB/T729%-1994 1.12 requirements, dismantle and test can be restored to do not meet the requirements of FB7E8818-1998
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