CN117213845A - Engine timing chain reliability evaluation method - Google Patents
Engine timing chain reliability evaluation method Download PDFInfo
- Publication number
- CN117213845A CN117213845A CN202311428589.0A CN202311428589A CN117213845A CN 117213845 A CN117213845 A CN 117213845A CN 202311428589 A CN202311428589 A CN 202311428589A CN 117213845 A CN117213845 A CN 117213845A
- Authority
- CN
- China
- Prior art keywords
- engine
- timing chain
- working condition
- reliability
- condition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000011156 evaluation Methods 0.000 title claims description 17
- 238000012360 testing method Methods 0.000 claims abstract description 27
- 239000000446 fuel Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 26
- 239000004071 soot Substances 0.000 claims abstract description 26
- 239000012895 dilution Substances 0.000 claims abstract description 24
- 238000010790 dilution Methods 0.000 claims abstract description 24
- 238000013461 design Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000010705 motor oil Substances 0.000 claims description 7
- 239000000779 smoke Substances 0.000 claims description 6
- 239000003921 oil Substances 0.000 claims description 5
- 239000000295 fuel oil Substances 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 description 4
- 238000012795 verification Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000011981 development test Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Landscapes
- Testing Of Engines (AREA)
Abstract
The application provides a method for evaluating the reliability of an engine timing chain, which comprises the following steps: selecting two timing chains, detecting the original length of the timing chains, respectively assembling the two timing chains into two new engines A, B, and then finishing running-in according to running-in specifications; setting a failure risk working condition, a soot extreme working condition and a low-temperature idle fuel dilution preset working condition of the timing chain by using the engine A; sequentially operating the engine B under a failure risk working condition, a soot extreme working condition and a low-temperature idle fuel dilution preset working condition of the timing chain; and disassembling the engine B, taking out the timing chain, detecting the length of the timing chain after the test, and if the difference of the length of the timing chain after the test minus the original length is smaller than a set value, meeting the requirement on the reliability of the timing chain, otherwise, not meeting the requirement. The application can evaluate the reliability of the timing chain more comprehensively.
Description
Technical Field
The application belongs to the technical field of evaluation of engine parts, and particularly relates to an evaluation method of reliability of an engine timing chain.
Background
The timing chain is a main part of an engine timing system and is used for realizing normal phases of a crankshaft and a camshaft and normal operation of air intake, oil injection and ignition of the engine. The timing chain is generally lubricated by engine oil, and the reliability and wear resistance of the timing chain can directly influence the performance of an engine, such as abnormal wear and elongation of the timing chain, abnormal combustion of the engine and even disturbance of valve train operation of the engine, damage of hardware such as valve striking piston and the like. Whether the reliability of the timing chain meets the use requirement of the matched engine or not needs to be subjected to model selection matching according to the technical characteristics, performance indexes and the like of the engine, and theoretical calculation, simulation analysis and test verification are required to be performed so as to ensure good design state and reliable service life.
The engine development process needs to carry out a series of mechanical development tests and reliability tests, and stress analysis tests, tensioner performance tests and the like are carried out aiming at the timing chain. However, the reliability test of the timing chain lacks pertinence verification, and is often additionally evaluated in the general reliability test of the engine, so that the consideration of the influence factors of the reliability of the timing chain is less, the test working condition is single, the maximum torque working condition or the rated working condition is common, the evaluation of the reliability of the timing chain is on one side, the use scene of the timing chain cannot be comprehensively inspected, and the condition of insufficient reliability verification is easy to occur. Therefore, how to design an evaluation method for reliability of the timing chain of the engine so that the reliability evaluation of the timing chain is comprehensive becomes a technical problem which needs to be solved by those skilled in the art.
Disclosure of Invention
The application aims to provide an engine timing chain reliability evaluation method for solving the technical problems in the prior art.
In order to achieve the above purpose, the present application provides the following technical solutions:
an engine timing chain reliability evaluation method, comprising the steps of:
step S1, selecting two timing chains, detecting the original length of the timing chains, respectively assembling the two timing chains into two new engines A, B, and then finishing running-in according to running-in specifications;
s2, setting failure risk working conditions of the timing chain by using the engine A;
s3, setting soot extreme value working conditions by using an engine A;
s4, setting a low-temperature idle fuel dilution preset working condition by using the engine A;
s5, enabling the engine B to sequentially operate a failure risk working condition, a soot extreme working condition and a low-temperature idle fuel dilution preset working condition of the timing chain;
and S6, disassembling the engine B, taking out the timing chain, detecting the length of the timing chain after the test, and if the difference of the length of the timing chain after the test minus the original length is smaller than a set value, meeting the requirement on the reliability of the timing chain, otherwise, not meeting the requirement.
Preferably, the specific method for setting the failure risk condition of the timing chain in step S2 is as follows: the method comprises the steps of installing a sensor on an engine A, testing the load of a timing chain on a rack, respectively lifting the rotating speed of the engine from idling to rated rotating speed at a constant speed in a set time under the conditions that the engine load is 10%, 50% and 100%, and then reducing the rotating speed from the rated rotating speed to the idling at a constant speed to obtain working conditions corresponding to the maximum load of the timing chain under three loads, wherein the working conditions are respectively recorded as a first working condition, a second working condition and a third working condition.
Preferably, the set time is 60 seconds.
Preferably, in step S3, the specific setting method of the soot extremum condition is as follows: and (3) carrying out smoke intensity universal characteristic test by using the engine A to obtain a working condition corresponding to the maximum smoke intensity of the engine, namely a soot extreme value working condition.
Preferably, in step S4, the method for setting the preset low-temperature idle fuel dilution condition is as follows: and (3) adding fuel into the oil pan of the engine A by using the engine test bench water constant temperature device to enable the fuel dilution rate of engine oil to reach 5%, namely the low-temperature idle fuel dilution preset working condition.
Preferably, in step S5, the intake water temperature of the engine is set to 95 ℃ under the working conditions of the first, second, third and soot extreme value; and when the low-temperature idle fuel oil is diluted to a preset working condition, setting the water inlet temperature of the engine to be 30 ℃.
Preferably, in step S5, the operation time of the first, second, third, soot extremum, and low-temperature idle fuel dilution preset conditions is 4 hours.
Preferably, in step S5, the engine B is sequentially operated for 20 cycles in the order of the first condition, the second condition, the third condition, the soot extremum condition, and the low-temperature idle fuel dilution preset condition.
Preferably, when the engine B is assembled, a piston and a cylinder body which can enable the engine B to have the largest cylinder matching gap are selected, and a piston ring with the smallest tangential elasticity design value is selected.
Preferably, the set point is 0.1% of the original length of the timing chain.
The application has the beneficial effects that:
the reliability evaluation method of the engine timing chain comprises a plurality of working conditions when the reliability test is carried out, and the reliability of the timing chain under the working conditions can be evaluated, so that the reliability of the timing chain can be comprehensively evaluated, and the reliability of the timing chain can be accurately evaluated.
Drawings
For a clearer description of embodiments of the present application or of the prior art, reference will be made briefly to the accompanying drawings, which are required to be used in the embodiments, and to further detail of specific embodiments of the present application, taken in conjunction with the accompanying drawings, wherein
Fig. 1 is a flowchart of an engine timing chain reliability evaluation method according to an embodiment of the present application.
Detailed Description
In order to make the technical solution of the present application better understood by those skilled in the art, the present solution will be described in further detail with reference to specific embodiments.
As shown in fig. 1, an embodiment of the present application provides a method for evaluating reliability of an engine timing chain, which includes the steps of:
step S1, selecting two timing chains, detecting the original length of the timing chains, respectively assembling the two timing chains into two new engines A, B, and then finishing running-in according to running-in specifications;
s2, setting failure risk working conditions of the timing chain by using the engine A;
s3, setting soot extreme value working conditions by using an engine A;
s4, setting a low-temperature idle fuel dilution preset working condition by using the engine A;
s5, enabling the engine B to sequentially operate a failure risk working condition, a soot extreme working condition and a low-temperature idle fuel dilution preset working condition of the timing chain;
and S6, disassembling the engine B, taking out the timing chain, detecting the length of the timing chain after the test, and if the difference of the length of the timing chain after the test minus the original length (namely the elongation of the timing chain) is smaller than a set value, meeting the requirement on the reliability of the timing chain, otherwise, not meeting the requirement.
The reliability evaluation method for the engine timing chain provided by the embodiment of the application comprises a plurality of working conditions when the reliability test is carried out, and can evaluate the reliability of the timing chain under the working conditions, so that the reliability of the timing chain can be comprehensively evaluated, and the reliability of the timing chain can be accurately evaluated.
Further, the specific method for setting the failure risk condition of the timing chain in step S2 is as follows: the method comprises the steps of installing a sensor on an engine A, testing the load of a timing chain on a rack, respectively lifting the rotating speed of the engine from idling to rated rotating speed at a constant speed in a set time under the conditions that the engine load is 10%, 50% and 100%, and then reducing the rotating speed from the rated rotating speed to the idling at a constant speed to obtain working conditions corresponding to the maximum load of the timing chain under three loads, wherein the working conditions are respectively recorded as a first working condition, a second working condition and a third working condition.
Preferably, the set time is 60 seconds.
Specifically, in step S3, the specific setting method of the soot extremum working condition is as follows: and (3) carrying out smoke intensity universal characteristic test by using the engine A to obtain a working condition corresponding to the maximum smoke intensity of the engine, namely a soot extreme value working condition.
Further, in step S4, the method for setting the preset conditions for low-temperature idle fuel dilution includes: and (3) adding fuel into the oil pan of the engine A by using the engine test bench water constant temperature device to enable the fuel dilution rate of engine oil to reach 5%, namely the low-temperature idle fuel dilution preset working condition.
Preferably, in step S5, the intake temperature of the engine is set to 95 ℃ under the working conditions of the first, second, third and soot extreme value; and when the low-temperature idle fuel oil is diluted to a preset working condition, setting the water inlet temperature of the engine to be 30 ℃.
Further, in step S5, the operation time of the first working condition, the second working condition, the third working condition, the soot extreme working condition, and the low-temperature idle fuel dilution preset working condition is 4 hours.
Specifically, in step S5, the engine B is sequentially operated for 20 cycles in the order of the first working condition, the second working condition, the third working condition, the soot extremum working condition, and the low-temperature idle fuel dilution preset working condition.
Further, when the engine B is assembled, a piston and a cylinder body which can enable the engine B to have the largest cylinder matching gap are selected, and a piston ring with the smallest tangential elasticity design value is selected, so that the condition that the air leakage of the piston reaches the extreme value is created, the condition that soot enters engine oil is increased, and the reliability of the timing chain under the soot extreme value working condition is tested better.
Specifically, the set value is 0.1% of the original length of the timing chain.
It can be understood that in step S1, besides detecting the length of the timing chain, design parameters such as weight, center distance, etc. of the timing chain may also be detected; in the test process, parameters such as engine power, torque, exhaust temperature, engine oil pressure and the like can be recorded.
According to the timing chain stress analysis method, the endurance working conditions are selected based on the timing chain stress analysis result, a plurality of failure risk working conditions of the timing chain are covered, and the reliability of the timing chain in multiple scenes can be effectively evaluated; the application also designs a method for adding the constant-proportion fuel oil into the oil pan so as to create the engine oil dilution working condition and effectively evaluate the influence of the lubrication limit working condition on the reliability of the timing chain; the application designs soot acceleration generation working conditions, manufactures and simulates the abrasion scene of the timing chain in the use process, and realizes the evaluation of the abrasion resistance reliability of the timing chain; the application designs a 400-hour accelerated wear reliability test, and accurately evaluates whether the life cycle of the timing chain meets the use requirement according to the simulated mileage. The application adopts a mode of evaluating the elongation or weight of the timing chain to accurately evaluate the reliability of the timing chain.
By using the timing chain reliability evaluation method, the accurate evaluation of the reliability of the timing chain can be realized, the matching performance and the use effect of the timing chain can be comprehensively evaluated, the timing chain can be comprehensively evaluated in the engine development, and the market quality problem and the engine damage caused by insufficient verification can be effectively avoided.
The foregoing is merely a preferred embodiment of the present application, and it should be noted that these examples are only for illustrating the present application and are not intended to limit the scope of the present application, and that various changes and modifications may be made by one skilled in the art after reading the contents of the present application, and the equivalent forms are also within the scope of the present application as defined in the appended claims.
Claims (10)
1. The method for evaluating the reliability of the engine timing chain is characterized by comprising the following steps of:
step S1, selecting two timing chains, detecting the original length of the timing chains, respectively assembling the two timing chains into two new engines A, B, and then finishing running-in according to running-in specifications;
s2, setting failure risk working conditions of the timing chain by using the engine A;
s3, setting soot extreme value working conditions by using an engine A;
s4, setting a low-temperature idle fuel dilution preset working condition by using the engine A;
s5, enabling the engine B to sequentially operate a failure risk working condition, a soot extreme working condition and a low-temperature idle fuel dilution preset working condition of the timing chain;
and S6, disassembling the engine B, taking out the timing chain, detecting the length of the timing chain after the test, and if the difference of the length of the timing chain after the test minus the original length is smaller than a set value, meeting the requirement on the reliability of the timing chain, otherwise, not meeting the requirement.
2. The method for evaluating the reliability of an engine timing chain according to claim 1, wherein the specific method for setting the failure risk condition of the timing chain in step S2 is as follows: the method comprises the steps of installing a sensor on an engine A, testing the load of a timing chain on a rack, respectively lifting the rotating speed of the engine from idling to rated rotating speed at a constant speed in a set time under the conditions that the engine load is 10%, 50% and 100%, and then reducing the rotating speed from the rated rotating speed to the idling at a constant speed to obtain working conditions corresponding to the maximum load of the timing chain under three loads, wherein the working conditions are respectively recorded as a first working condition, a second working condition and a third working condition.
3. The engine timing chain reliability evaluation method according to claim 2, wherein the set time is 60 seconds.
4. The method for evaluating the reliability of an engine timing chain according to claim 1, wherein in step S3, the specific setting method of the soot extremum condition is: and (3) carrying out smoke intensity universal characteristic test by using the engine A to obtain a working condition corresponding to the maximum smoke intensity of the engine, namely a soot extreme value working condition.
5. The method for evaluating the reliability of an engine timing chain according to claim 1, wherein in step S4, the method for setting the low-temperature idle fuel dilution preset condition is as follows: and (3) adding fuel into the oil pan of the engine A by using the engine test bench water constant temperature device to enable the fuel dilution rate of engine oil to reach 5%, namely the low-temperature idle fuel dilution preset working condition.
6. The method for evaluating the reliability of an engine timing chain according to claim 2, wherein in step S5, the intake water temperature of the engine is set to 95 ℃ in the case of the first, second, third, and soot extreme conditions; and when the low-temperature idle fuel oil is diluted to a preset working condition, setting the water inlet temperature of the engine to be 30 ℃.
7. The method according to claim 6, wherein in step S5, the operation time of the first, second, third, soot extremum, and low-temperature idle fuel dilution preset conditions is 4 hours.
8. The method according to claim 7, wherein in step S5, the engine B is sequentially operated for 20 cycles in the order of the first condition, the second condition, the third condition, the soot extremum condition, the low-temperature idle fuel dilution preset condition.
9. The method for evaluating the reliability of an engine timing chain according to claim 1, wherein a piston and a cylinder having a maximum cylinder clearance for the engine B are selected and a piston ring having a minimum tangential spring design value is selected when the engine B is assembled.
10. The engine timing chain reliability evaluation method according to any one of claims 1 to 9, characterized in that the set value is 0.1% of the original length of the timing chain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311428589.0A CN117213845A (en) | 2023-10-31 | 2023-10-31 | Engine timing chain reliability evaluation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311428589.0A CN117213845A (en) | 2023-10-31 | 2023-10-31 | Engine timing chain reliability evaluation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117213845A true CN117213845A (en) | 2023-12-12 |
Family
ID=89035589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311428589.0A Pending CN117213845A (en) | 2023-10-31 | 2023-10-31 | Engine timing chain reliability evaluation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117213845A (en) |
-
2023
- 2023-10-31 CN CN202311428589.0A patent/CN117213845A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Porteiro et al. | Diesel engine condition monitoring using a multi-net neural network system with nonintrusive sensors | |
| CN113504050B (en) | Carbon deposition and coking test method and device for EGR (exhaust gas Recirculation) system | |
| CN101566092B (en) | A scavenge performance monitoring system and a method for monitoring a process parameter in the scavenging process | |
| EA031509B1 (en) | System and method for diagnosing engines | |
| EA027146B1 (en) | System and method for diagnosing an engine | |
| JP2016205388A (en) | Knock sensor systems and methods for detection of component conditions | |
| KoszAłKA | Model of operational changes in the combustion chamber tightness of a diesel engine | |
| CN112304624B (en) | Engine piston dynamic characteristic testing method | |
| CN113063602A (en) | Evaluation method for low-temperature cold start oil injection test of direct injection gasoline engine stand | |
| CN111133184A (en) | Method for checking the function of a pressure sensor in the air intake or exhaust gas discharge line of an internal combustion engine during operation, and engine control unit | |
| Gritsenko et al. | The Advancement of the Methods of Vibro-Acoustic Control of the ICE Gas Distribution Mechanism. | |
| CN115014781B (en) | Engine performance test method and system for simulating user first insurance | |
| US11401881B2 (en) | Fourier diagnosis of a charge cycle behavior of an internal combustion engine | |
| Ramirez et al. | A methodology for non-invasive diagnosis of diesel engines through characteristics of starter system performance | |
| CN117213845A (en) | Engine timing chain reliability evaluation method | |
| RU2034259C1 (en) | Method of diagnosing internal combustion engine faults | |
| US6055852A (en) | Method and apparatus for estimation of relative cylinder compression balance by cranking speed analysis | |
| Hountalas et al. | Evaluation of a new diagnostic technique to detect and account for load variation during cylinder pressure measurement of large-scale four-stroke diesel engines | |
| Radulescu et al. | Durability and reliability demonstration for switching roller finger follower in cylinder deactivation systems | |
| RU2474805C1 (en) | Method of diagnosing piston ice exhaust stage | |
| RU2744668C1 (en) | Method for assessing the technical condition of the cylinder-piston group of an internal combustion engine | |
| KR102689264B1 (en) | Diagnosis method of the gas-sealed condition of cylinders in a marine 2-stroke diesel engine | |
| RU2789571C1 (en) | Method for automated localization of leaky timing valves | |
| Yang et al. | Research on Fault Diagnosis Method of Diesel Engine Thermal Power Conversion Process | |
| RU2716935C1 (en) | Method of localization of non-tight valves of gdm |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |