JB/T 51170-2000 Diesel engine fuel injection pump plunger assembly product quality classification
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T51169-2000
Diesel Engine Plunger Injection Pump Assembly
Product Quality Grading
(Internal Use)
Published on 2000-03-30
National Machinery Industry Bureau
Implemented on 2000-10-01
JB/T51169-2000
This standard is a revision of JB/T5116996 "Diesel Engine Plunger Injection Pump Assembly Product Quality Grading". During the revision, the original standard was edited and explanatory content on sampling inspection and quality grade assessment was added according to GB/T2828-1987. Compared with JB/T5116996, the main technical content has been changed. The only requirement in Table 2, "Deviation of the average fuel supply of each cylinder under the calibration conditions of multi-cylinder synthetic fuel injection pumps and single-cylinder fuel injection pumps for multi-cylinder diesel engines from the calibration value", has been restored to the requirements of JB/T5116994, because the fuel pump and nozzle manufacturers cannot meet it.
Appendix A of this standard is the appendix of the standard.
This standard replaces JB/T5116996 from the date of implementation. This standard is proposed and managed by the Fuel Pump and Nozzle Standardization Technical Committee. The drafting unit of this standard: Wuxi Fuel Pump and Nozzle Research Institute. The main drafters of this standard: Zhu Xifen, Xu Nianbao, Zhang Limin. This standard was first issued in October 1986, revised for the first time in 1988, and the standard number was adjusted to JB/51169.1~51169.3-94 in 1994, and revised for the third time in 1996. 1 Scope
Machinery Industry Standard of the People's Republic of China
Diesel Engine Plunger Injection Pump Assembly
Product Quality Grading
(Internal Use)
JB/T51169—2000
Replaces JBT511—96
This standard specifies the quality indicators, test methods and inspection rules for plunger injection pump assemblies with or without speed regulators for medium and small power diesel engines (hereinafter referred to as injection pumps). This standard applies to the quality inspection and grade assessment of injection pump products for medium and small power diesel engines. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB252-1994
GB/T2828——1987
GB/T 5770—1997
GB/T80291987
JB/T 6291.1—1992
JB/T 6291.2-—1992
JB/T7661—1995
JB/T8121—1999
JB/T9734—1999
JB/T511782000
3 Quality Indicators
Light Diesel Oil
Counting Sampling Procedure and Sampling Table for Batch Inspection (Applicable to Manual Continuous Batch Inspection) Diesel Engine Plunger Injection Pump
Diesel Engine Injection Pump Pump oil calibration
Technical conditions for piston oil pump assembly
Test method for piston oil pump assembly
Cleanliness limit and determination method of diesel engine oil pump nozzle productHigh-pressure oil pipe assembly for diesel engine fuel injection pump test benchTechnical conditions for fuel injection pump test bench
Reliability assessment and evaluation method, bench test method, fault classification and judgment rules for synthetic fuel injection pump assembly3.1 The fuel supply sequence of each cylinder of a multi-cylinder synthetic fuel injection pump shall be in accordance with the agreement between the user and the manufacturer. Note: If there is no agreement between the user and the manufacturer, the relevant documents of the manufacturer shall be followed. 3.2 The fuel supply pre-stroke deviation of the reference cylinder of the fuel injection pump shall comply with the provisions of Table 1. 3.3 The angle deviation between the fuel supply starting point of each cylinder of the multi-cylinder synthetic fuel injection pump and the fuel supply starting point of the reference cylinder shall comply with the provisions of 3.5 of GB/T5770-1997. 3.4 The fuel quantity adjustment mechanism of the fuel injection pump shall be flexible and unobstructed. The multi-cylinder synthetic fuel injection pump is tested for the recovery deviation of the fuel supply under the calibrated working condition. The qualified product is ±3.5%, the first-class product is ±3%, and the superior product is ±2.5%. The calculation formula is shown in Appendix A (Standard Appendix) (A1). 3.5 The fuel supply characteristics and deviations of the fuel injection pump shall be as specified in Table 2. 3.6 The ratio of the speed of action of the speed regulator of the multi-cylinder synthetic fuel injection pump to the calibrated speed shall be as specified in the agreement between the user and the manufacturer or the relevant technical documents of the manufacturer.
Table 1 Fuel supply pre-stroke deviation quality index
Approved by the State Machinery Industry Bureau on March 30, 2000 mm
Implementation on October 1, 2000
Fuel injection pump type
Multi-cylinder fuel injection pump
Single-cylinder fuel injection pump
JB/T51169—2000
Pre-stroke deviation quality index
Qualified product
First-class product
According to the agreement between the user and the manufacturer 1
1) If there is no agreement between the user and the manufacturer, the relevant documents of the manufacturer shall apply. Table 2 Fuel supply quantity characteristics of fuel injection pumps and their deviations No.
Test items
Qualified product
Multi-cylinder synthetic fuel injection pumps and single-cylinder fuel injection pumps for multi-cylinder diesel engines under the calibration conditions of each cylinder Deviation of average fuel supply from the calibrated value Maximum fuel supply and deviation of a single-cylinder fuel injection pump at the calibrated speed Deviation of average fuel supply at the maximum torque speed of a diesel engine 230%~50% Deviation of average fuel supply at the calibrated speed 3) Deviation of average fuel supply at the maximum allowable no-load speed of a diesel engine 4) Fuel cut-off speed
Deviation of average fuel supply at a rapid speed of a diesel engine Deviation of average fuel supply at the starting speed of a diesel engine D) Calculation formula See Appendix A (A2)
2), 3), 4) Whether to detect or not is subject to the agreement between the user and the manufacturer 3.7
Superior product
First-class product
According to the agreement between the user and the manufacturer
Superior product
According to the agreement between the user and the manufacturer
The unevenness of fuel supply S of each cylinder of a multi-cylinder synthetic fuel injection pump is as specified in Table 3. Calculation formula See Appendix A (A3). Other working conditions: If there are special requirements for the unevenness of the fuel supply to each cylinder, there shall be no oil leakage at the seals of the fuel injection pump according to the agreement between the user and the manufacturer. The cleanliness limit of the single-cylinder fuel injection pump shall be specified in Table 4. Table 3: Unevenness of fuel supply to each cylinder of multi-cylinder synthetic fuel injection pump Unevenness of fuel supply to each cylinder 5%
Number of fuel injection pump cylinders
Calibration working condition (or maximum torque working condition)
Qualified product
First-class product
Superior product
Qualified product
Table 4: Cleanliness limit of single-cylinder fuel injection pump
Rapid Working conditions
First-class products
Cleanliness limit
Qualified products
First-class products
Superior products
Superior products
O, I, K, A, B
JB/T51169—2000
3.10 Cleanliness limit of multi-cylinder synthetic fuel injection pump is calculated by the cleanliness limit of the injection pump lubrication chamber W, and the cleanliness limit of the injection pump fuel chamber W. The qualified product is 1 (W, + W), the first-class product is 0.8 (W + W,), and the superior product is 0.7 (W, + W). Note: W, and W, are in accordance with the provisions of 4.5 of JB/T7661-1995. 3.11 The performance of the hand pump of the oil delivery pump assembly installed on the injection pump shall comply with the provisions of JB/T6291.1. 3.12 The oil suction vacuum (back pressure is zero) of the oil pump installed in the oil fountain at the rated speed shall comply with the provisions of JB/T62911. 3.13 The reliability and service life of the oil injection pump shall comply with the provisions of Table 5. 3.14 The oil injection pump shall be sealed intact, with clear label markings, and the appearance shall not have obvious bruises, bumps, or rust. Table 5 Reliability and service life of the oil injection pump
Matching diesel engine
Multi-cylinder diesel engine
Single-cylinder diesel engine
4 Test method
4.1 Test conditions
Mean time between failures (MTBF)
Qualified products
4.1.1 The oil inlet pressure is 0.1MPa.
First-class products
4.1.2 The oil inlet temperature is 40℃±2℃.
Superior product
Qualified product
4.1.3 The test oil shall comply with the diesel engine fuel injection pump calibration oil specified in GB/T8029. Service life
First-class product
Superior product
4.1.4 The fuel injection pump test bench must comply with the provisions of GB/T9734, and the high-pressure oil pipe assembly used in the test bench shall comply with the provisions of GB/T8121.
4.1.5 The standard injector assembly used in the fuel injection pump test bench shall comply with the requirements of GB/T9735, and the needle valve opening pressure is 17.2+03MPa. 4.2 Test method
4.2.1 Determination of fuel supply pre-stroke
The fuel injection pump does not have a fuel outlet valve spring and a fuel outlet valve core. A test oil with a pressure of 0.015MPa is introduced into the fuel inlet of the fuel injection pump. The test oil flows out from the overflow pipe (with an inner diameter of 2mm and a length of 100mm) through the hole in the fuel outlet valve seat. The camshaft of the fuel injection pump is turned to make the plunger rise slowly from the bottom dead center. When the test oil flows out of the overflow pipe port at a rate of 8-12s per 10 drops, the distance from the plunger to this position is measured. 4.2.2 Determination of the interval angle between the fuel supply starting point of each cylinder and the fuel supply starting point of the reference cylinder. Loosen the standard fuel injector overflow valve of the fuel injection pump test bench, and input a test oil with a certain pressure (the pressure is specified by the opening pressure of the fuel outlet valve) from the fuel inlet of the fuel injection pump, so that it flows out from the fuel injector overflow pipe on the fuel injection pump test bench through the fuel outlet valve seat. Slowly rotate the flywheel of the fuel injection pump test bench, and determine the starting point of fuel supply at the moment when the oil at the overflow pipe stops flowing out. Take the starting point of fuel supply of the reference cylinder as the base point, and measure the interval angle between the starting point of fuel supply of each cylinder and the starting point of fuel supply of the reference cylinder in sequence. 4.2.3 Flexibility test of fuel injection pump oil quantity adjustment mechanism Single cylinder pump: When the fuel injection pump plunger is at any position between the top dead center and the bottom dead center, there should be no feeling of resistance when pulling the oil quantity adjustment rod (or adjustment arm).
JB/T51169—2000
Multi-cylinder fuel injection pump without speed regulator: When the fuel injection pump is stationary, place the oil quantity adjustment rod in a horizontal position, and slowly move the oil quantity adjustment rod in the direction of increasing and decreasing fuel within the full stroke range to measure its resistance value range. Its resistance value should comply with the provisions of the technical documents approved by a certain procedure.
A multi-cylinder fuel injection pump with a speed regulator: On the fuel injection pump test bench, fix the fuel injection pump speed regulator control handle in the full load position, gradually increase the fuel injection pump speed from the calibrated speed to the oil stop speed, and then gradually reduce it to the calibrated speed, and measure the fuel supply at the two calibrated speeds before and after. 4.2.4 Test for uneven fuel supply of each cylinder
Measure the uneven fuel supply of each cylinder under the calibrated working condition and the idle working condition. 4.2.4.1 Supply the fuel injection pump with test oil of the specified pressure, and measure the amount of oil flowing out of the fuel injection pump for a certain number of cycles when the fuel injection pump is adjusted to the specified pull rod (gear rod) position and speed
4.2.4.2 The oil in the measuring cylinder should have 30s of sinking time before reading, and the value should be read at the bottom of the meniscus containing oil in the measuring cylinder when reading the oil volume. When pouring oil, the measuring rack should be tilted 45° and maintained for 30s. 4.2.5 Fuel supply quantity characteristic test
Fix the governor control handle at the full load position and the idle position respectively, and measure the full load fuel supply quantity characteristic and the idle fuel supply quantity characteristic of the fuel injection pump. The fuel supply quantity measurement points shall be in accordance with the provisions of Table 2. During the test, the speed of the fuel injection pump increases from low to high at a certain interval, and the operation of the fuel injection pump shall not be stopped.
The duration of each measurement shall ensure that the fuel supply quantity is not less than 20×10°mm (20mL). When measuring the idle fuel supply quantity, it shall not be less than 5X103mm2 (5mL).
When the fuel supply is cut off at high speed, the fuel supply shall be cut off. A small amount of fuel is allowed to be sprayed out through the injector, and the amount of fuel shall not be greater than one-fourth of the idle fuel supply quantity. 4.2.6 Fuel injection pump sealing test
4.2.6.1 Inject compressed air with a pressure of 0.5MPa into the fuel inlet of the fuel injection pump (for fuel injection pumps sealed with O-rings between the plunger and the fuel injection pump body, inject compressed air with a pressure of 0.4MPa into the fuel injection pump, close the oil outlet of the oil outlet valve, and then immerse the fuel injection pump in diesel for 15S. There should be no leakage (a small amount of leakage is allowed at the neck of the plunger). 4.2.6.2 Inject compressed air with a certain pressure into the vent hole of the governor or fuel injection pump (see Table 6 for the air pressure), and then immerse the fuel injection pump in diesel for 15S. There should be no leakage. The oil quantity adjustment rod (rack) is allowed to be above the center line. There is a slight leak in one part. 4.2.6.3 During the performance test, no oil leakage is allowed. 4.2.7 Test of the cleanliness limit of the fuel injection pump
The test method for the cleanliness of the fuel injection pump shall be in accordance with the provisions of JB/T7661. 4.2.8 The test method for the oil suction vacuum degree of the oil transfer pump installed on the fuel injection pump and the performance of the hand pump shall be in accordance with the provisions of JB/T6291.2. 4.2.9 The bench test method for the reliability assessment of the fuel injection pump shall be in accordance with the provisions of JB/T51178. 4.2.10 The service life of the fuel injection pump shall be assessed according to the user tracking test. Table 6 Air pressure for fuel injection pump sealing test
Qualified products
Allowed tightening
5 Inspection rules||tt ||First-class products
Only one closed joint surface is allowed to be tightened once. The sampling inspection rules and sampling plan of the fuel injection pump shall comply with the provisions of GB/T2828. 4
Superior products
Tightening is not allowed
5.1 Sampling inspection rules and sampling plan
5.1.1 Classification of non-conformities
JB/T51169—2000
According to the provisions of GB/T2828, the quality characteristics of the inspected products that do not meet the standards or drawings are called non-conformities. According to their importance to product quality, non-conformities are generally divided into Class A non-conformities, Class B non-conformities, and Class C non-conformities. Class A non-conformities: extremely important quality characteristics of the product do not meet the requirements ; Class B non-conformity: the important quality characteristics of the product do not meet the requirements; Class C non-conformity: the general quality characteristics of the product do not meet the requirements. See Table 7 for the non-conformity classification of multi-cylinder synthetic fuel injection pumps. See Table 8 for the non-conformity classification of single-cylinder fuel injection pumps.
Non-conformity classification of multi-cylinder synthetic fuel injection pumps
Non-conformity
Cleanliness
Mean time between failures (MTBF)
Service life
Sealing
Oil cut-off speed
Flexibility of oil quantity adjustment mechanism
Standard working condition (or maximum torque working condition) Uneven oil supply of each cylinder Hooking oil pump hand pressure performance
1) When used in vehicles, first-class and superior products are assessed according to Group B. 2) When used for power generation, they are assessed according to Group B.
Unqualified
Inspection items
Pre-stroke deviation of fuel supply of reference cylinder
Angle deviation of fuel supply starting point of each cylinder to fuel supply starting point of reference cylinderDeviation of average fuel supply of each cylinder from calibration value under calibration conditions30%-50%Deviation of average fuel supply of each cylinder at calibration speedDeviation of average fuel supply of each cylinder at maximum torque speed of diesel engineSpeed governor working speed
Uneven fuel supply under rapid working conditions
Fuel supply at maximum allowable no-load speed of diesel engine2Deviation of average fuel supply of each cylinder under rapid working conditionsDeviation of average fuel supply of each cylinder at starting speedOil suction vacuum of oil delivery pump at calibration speedAppearance quality
Table 8 Unqualified classification of single cylinder fuel injection pump||tt| |Classification of non-conforming products
Inspection items
2 Acceptable quality level AQL value
JB/T51169—2000
Mean time between failures (MTBF) Service life
Cleanliness
Sealing
Flexibility of gear rod (or adjusting arm)
Maximum fuel supply at rated speed
Fuel supply pre-stroke deviation
Appearance quality
Three levels of AQL values are specified for fuel injection pump products according to qualified products, first-class products and superior products. The sampling plan and inspection result evaluation of multi-cylinder synthetic fuel injection pumps are shown in Table 9, and the sampling plan and inspection result evaluation of single-cylinder fuel injection pumps are shown in Table 10. Table 9 Sampling plan and test result evaluation of multi-cylinder synthetic fuel injection pump Unqualified classification
Inspection level
Sample size code
Inspection batch
Number of samples n
Qualified products
First-class products
Superior products
Ac, Re
Unqualified classification
5 (6) items
Single-cylinder fuel injection pump Sampling plan and test result evaluation A
12 (11, 10, 9 ) Item
Inspection Level
Sample Size Code
Inspection Batch N
Sample Number n
Qualified Products
First-class Products
Superior Products
5.1.3 Inspection Batch N
Ac, Re
Ac, Re
JB/T51169—2000
Specified inspection batch is 100 units for multi-cylinder synthetic fuel injection pumps and 200 units for single-cylinder fuel injection pumps. The inspection batch shall not be less than the specified batch quantity. If it is greater than the specified batch quantity, the product batch shall be divided into several batches, and one of the batches shall be randomly selected for sampling inspection. When sampling by users or sales agencies, the batch size is not limited.
5.1.4 Inspection level
For fuel injection pumps, special inspection level S-1 is used for Class A non-conformities, and general inspection level I is used for Class B and C non-conformities. 5.1.5 Sample size code
According to the inspection batch and inspection level, find out the corresponding sample size code of each type from GB/T2828 5.1.6 Sampling plan
Use a normal inspection single sampling plan. According to the sample size code and AQL value, find the corresponding normal inspection single sampling plan (n, Ac, Re) in GB/T2828, see Table 9 and Table 105.2 Sample extraction
Samples should be randomly selected from user units, commercial departments or parts companies, and are not subject to the lower limit of the batch range. If there is no stock at the above locations, with the consent of the relevant departments, samples can be taken from the production line or from products that have been put into storage recently (within 6 months). At this time, the batch range specified in 5.1.3 must be strictly followed.
5.3 Product quality grade assessment
5.3.1 Sample inspection
Samples should be inspected according to the unqualified classification specified in Table 7 and Table 8 and the sampling plan specified in Table 9 and Table 10, and in accordance with the provisions of this standard.
5.3.2 Batch evaluation
After all samples have been inspected, the results are summarized and filled in Table 11 and Table 12. According to the sampling plan of each category, the inspection conclusions are made respectively to determine whether they are qualified or not, and then make the final evaluation.
According to the results of the sample inspection, if the number of unqualified items in a certain category is less than or equal to the qualified determination number Ac, then the category is judged to be qualified. If the number of unqualified items in a certain category is greater than or equal to the unqualified determination number Re, then the category is judged to be unqualified. When the number of unqualified items in all categories is qualified, the batch of products can finally be judged to be qualified. 7
5.3.3 Quality Grade Assessment
JB/T51169—2000
5.3.3.1 After all samples have been inspected, when the number of unqualified items in each category of samples is less than or equal to Ac of superior products, the inspected product shall be rated as superior products: when the number of unqualified items in each category of samples is less than or equal to Ac of first-class products, the inspected product shall be rated as first-class products: when the number of unqualified items in each category of samples is less than or equal to Ac of qualified products, the inspected product shall be rated as qualified products. 5.3.3.2 If the product quality is rated as unqualified, it is allowed to be re-inspected after 6 months. If the re-inspection is qualified, it can still be rated as qualified products, but it cannot be rated as first-class products or superior products.
Project category
Class A unqualified projects
Class B unqualified projects
Class C unqualified projects
Project category
Class A unqualified projects
Class B unqualified projects
Class C unqualified projects
Qualified products
Summary of test results of multi-cylinder synthetic fuel injection pump
Qualified products
Superior products
Summary of test results of single-cylinder fuel injection pump
Superior products
Judgment by categorywwW.bzxz.Net
By category Judgment
Final judgment
Final judgment
JB/T51169—2000
Appendix A
(Appendix to the standard)
Calculation formula
Fuel supply recovery deviation B under calibrated conditionsThe fuel supply recovery deviation β under calibrated conditions is calculated according to formula (A1): β=Q=×100%
Wherein: β——fuel supply recovery deviation under calibrated conditions; Q—calibrated fuel supply of the reference cylinder before speed increase, mL; 9—fuel supply of the reference cylinder when speeding down to the calibrated speed, mL. A2 Deviation of the average fuel supply of each cylinder from the calibration value Y Deviation of the average fuel supply of each cylinder from the calibration value y is calculated according to formula (A2) = 0α×100%
Deviation of the average fuel supply of each cylinder from the calibration value; In the formula: y
0 Average fuel supply of each cylinder, mL;
0 Calibrated fuel supply, mL.
A3 Unevenness of fuel supply of each cylinder of the injection pump S
Unevenness of fuel supply of each cylinder of the injection pump 8 is calculated according to formula (A3): 2(gm-9m）
In the formula: 8-
Unevenness of fuel supply of each cylinder;
Omx--The fuel supply of the largest cylinder among all cylinders, mL; Omin--The fuel supply of the smallest cylinder among all cylinders, mL. x100%
（A3)
Mechanical industry standard
Diesel engine plunger injection pump assembly
Product quality classification
(Internal use)
JB/T51169-2000
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2, Shouti South Road, Beijing, Postal Code 100044)*|| tt||1/16 sheet 3/4 word count 2Q000
Format 880×1230
First edition in August 2000
Print run 1-500
First printing in August 2000
Price 1500 yuan
2000-003
Mechanical Industry Standard Service Network: http/kvwwJB.ac.cn00092If the product quality is rated as unqualified, it is allowed to re-inspect it 6 months later. If the re-inspection is qualified, it can still be rated as qualified, but it cannot be rated as first-class or superior.
Project category
Class A unqualified items
Class B unqualified items
Class C unqualified items
Project category
Class A unqualified items
Class B unqualified items
Class C unqualified items
Qualified products
Summary table of test results of multi-cylinder synthetic fuel injection pumps
Qualified products
Superior products
Summary table of test results of single-cylinder fuel injection pumps
Superior products
Judgment by category
By category Judgment
Final judgment
Final judgment
JB/T51169—2000
Appendix A
(Appendix to the standard)
Calculation formula
Fuel supply recovery deviation B under calibrated conditionsThe fuel supply recovery deviation β under calibrated conditions is calculated according to formula (A1): β=Q=×100%
Wherein: β——fuel supply recovery deviation under calibrated conditions; Q—calibrated fuel supply of the reference cylinder before speed increase, mL; 9—fuel supply of the reference cylinder when speeding down to the calibrated speed, mL. A2 Deviation of the average fuel supply of each cylinder from the calibration value Y Deviation of the average fuel supply of each cylinder from the calibration value y is calculated according to formula (A2) = 0α×100%
Deviation of the average fuel supply of each cylinder from the calibration value; In the formula: y
0 Average fuel supply of each cylinder, mL;
0 Calibrated fuel supply, mL.
A3 Unevenness of fuel supply of each cylinder of the injection pump S
Unevenness of fuel supply of each cylinder of the injection pump 8 is calculated according to formula (A3): 2(gm-9m）
In the formula: 8-
Unevenness of fuel supply of each cylinder;
Omx--The fuel supply of the largest cylinder among all cylinders, mL; Omin--The fuel supply of the smallest cylinder among all cylinders, mL. x100%
（A3)
Mechanical industry standard
Diesel engine plunger injection pump assembly
Product quality classification
(Internal use)
JB/T51169-2000
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2, Shouti South Road, Beijing, Postal Code 100044)*|| tt||1/16 sheet 3/4 word count 2Q000
Format 880×1230
First edition in August 2000
Print run 1-500
First printing in August 2000
Price 1500 yuan
2000-003
Mechanical Industry Standard Service Network: http/kvwwJB.ac.cn00092If the product quality is rated as unqualified, it is allowed to re-inspect it 6 months later. If the re-inspection is qualified, it can still be rated as qualified, but it cannot be rated as first-class or superior.
Project category
Class A unqualified items
Class B unqualified items
Class C unqualified items
Project category
Class A unqualified items
Class B unqualified items
Class C unqualified items
Qualified products
Summary table of test results of multi-cylinder synthetic fuel injection pumps
Qualified products
Superior products
Summary table of test results of single-cylinder fuel injection pumps
Superior products
Judgment by category
By category Judgment
Final judgment
Final judgment
JB/T51169—2000
Appendix A
(Appendix to the standard)
Calculation formula
Fuel supply recovery deviation B under calibrated conditionsThe fuel supply recovery deviation β under calibrated conditions is calculated according to formula (A1): β=Q=×100%
Wherein: β——fuel supply recovery deviation under calibrated conditions; Q—calibrated fuel supply of the reference cylinder before speed increase, mL; 9—fuel supply of the reference cylinder when speeding down to the calibrated speed, mL. A2 Deviation of the average fuel supply of each cylinder from the calibration value Y Deviation of the average fuel supply of each cylinder from the calibration value y is calculated according to formula (A2) = 0α×100%
Deviation of the average fuel supply of each cylinder from the calibration value; In the formula: y
0 Average fuel supply of each cylinder, mL;
0 Calibrated fuel supply, mL.
A3 Unevenness of fuel supply of each cylinder of the injection pump S
Unevenness of fuel supply of each cylinder of the injection pump 8 is calculated according to formula (A3): 2(gm-9m）
In the formula: 8-
Unevenness of fuel supply of each cylinder;
Omx--The fuel supply of the largest cylinder among all cylinders, mL; Omin--The fuel supply of the smallest cylinder among all cylinders, mL. x100%
（A3)
Mechanical industry standard
Diesel engine plunger injection pump assembly
Product quality classification
(Internal use)
JB/T51169-2000
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2, Shouti South Road, Beijing, Postal Code 100044)*|| tt||1/16 sheet 3/4 word count 2Q000
Format 880×1230
First edition in August 2000
Print run 1-500
First printing in August 2000
Price 1500 yuan
2000-003
Mechanical Industry Standard Service Network: http/kvwwJB.ac.cn0009
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