CN106338400B - Engine valve flies off test method - Google Patents
Engine valve flies off test method Download PDFInfo
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- CN106338400B CN106338400B CN201610740151.XA CN201610740151A CN106338400B CN 106338400 B CN106338400 B CN 106338400B CN 201610740151 A CN201610740151 A CN 201610740151A CN 106338400 B CN106338400 B CN 106338400B
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- cylinder pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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- General Physics & Mathematics (AREA)
- Testing Of Engines (AREA)
Abstract
The invention discloses a kind of engine valves to fly off test method, includes the following steps：Step 1, whether first checkout facility normally carries out warming-up again with engine condition, then shuts down and carries out cylinder pressure test, and records related data；Step 2, it using the quick towing astern engine of electric dynamometer to oil-break rotating speed point, is measured after shutdown with cylinder pressure table and records cylinder pressure data, if cylinder presses pad value within 5%, judge that valve does not occur under the rotating speed flies off phenomenon, continues verification experimental verification；Step 3, step 2 and the rotating speed that gradually progressively increases on the basis of oil-break rotating speed are repeated, the ladder that progressively increases is 200rpm; often progressively increase a rotating speed point, and cylinder pressure of measurement is shut down after stablizing 10s, attenuation rate is pressed to judge whether that valve, which occurs, flies off phenomenon indirectly by cylinder; step 4, engine is carried out tearing machine verification open.The present invention can quickly judge that limit speed when valve is flown off occurs for engine, and new direction is provided for scientific research and development, has good application prospect.
Description
Technical field
The present invention relates to engine valves to test field.It is more particularly related to a kind of engine valve is flown off
Test method.
Background technology
The valve opening and closing organ of engine are made of valve, valve spring, cam and associated component.In engine
During running at high speed, since the influence of the parameters such as the rigidity of spring, endurance degree, cam profile makes the mechanism show not
Same characteristic.If spring rate is insufficient, endurance degree is poor etc., valve return can be generated not in time, be more than in engine
After certain rotating speed, when cam runs to valve-closing angle by valve opening, valve is still within opening due to sluggishness,
Valve stem is in disengaged position with cam at this time, this flies off for valve.When, which there is valve, in engine flies off phenomenon, non-return
Valve can collide with running to the piston of top dead center position, and valve fracture, top land is caused to be damaged, under engine performance
The danger of detonation can occur under serious conditions for the influences such as drop.
In view of such harm, in order to avoid valve flies off the generation of phenomenon, needs clear and definite valve to fly off when phenomenon occurs
Engine Limit rotating speed flies off test method so as to form engine valve, by experiment, finds out turn that valve is caused to fly off
Fast range judges the reliability of engine, and force data is provided with, while can also accumulate Engine Limit for engine design of Simulation
Rotating speed empirical data.
Invention content
It can quickly judge that limit speed when valve is flown off occurs for engine the object of the present invention is to provide a kind of
Test method.
In order to realize these purposes and other advantages according to the present invention, provide a kind of engine valve and fly off experiment side
Method includes the following steps：
Step 1, preparation before experiment：
Whether checkout facility is normal with engine condition, and development engine is installed on electric power after acknowledgement state is normal surveys
On work(machine testing stand, to development engine carry out warming-up, it is to be tested reach hot with engine after, shut down, carry out cylinder pressure survey
Examination, and related data is recorded, cylinder pressure restores development engine after measuring；
Step 2, process is tested：
(a) vehicle is played, checks development engine idle stability, after without exception, warming-up is carried out to development engine；
(b) it after engine reaches hot, shuts down, the gas supply of open test engine；
(c) using electric dynamometer towing astern development engine, its rotating speed is made uniformly to be risen in 8~11s
3000rpm, air throttle are synchronized to standard-sized sheet；
(d) after stablizing 3s, electric dynamometer rotating speed is adjusted, engine is made to rise very rapidly up to oil-break rotating speed in 3~5s；
(e) reduction of speed after 5~8s of steady running, makes engine be shut down in 10s；
(f) it measures cylinder compression pressure with cylinder pressure table and records data；
(g) the cylinder pressure data before and after contrast test, if cylinder presses pad value to judge not occur under the rotating speed within 5%
Valve flies off phenomenon, continues verification experimental verification；
Step 3, the repeated authentication stage：
(a) the experiment process of step 2 is re-started, during the pending experiment to step 2 during (d) step, with oil-break
Based on rotating speed, 200rpm is incremented by engine speed for step-length to be tested, and is often repeated once, and is incremented by one by step-length of 200rpm
Secondary engine speed；
(b) until the cylinder pressure data cylinder pressure pad value before and after contrast test is more than 5%, then judge that the rotating speed issues angry door
Fly off phenomenon.
Step 4, engine analytic is verified：
(a) development engine is removed and decomposed from electric dynamometer testing stand；
(b) it checks and analyzes development engine cylinder cap sub-unit.
(c) by parsing to development engine, check the state of cylinder cap sub-unit and analyze test data, obtain examination
Test conclusion.
Preferably, wherein, it is 10s that development engine, which uniformly rises to the time that rotating speed is 3000rpm,.
Preferably, wherein, in step 1 checkout facility with engine condition it is whether normal before, first check electric power measurement of power
Whether the state of machine testing stand and electric dynamometer is normal.
The present invention includes at least following advantageous effect：The test method of the present invention can quickly judge that gas occurs for engine
Limit speed when door is flown off flies off valve available for various model engines and carries out verification experimental verification assessment, is engine zero
Part design exploitation, CAE simulating, verifyings and malfunction elimination provide effective test method, and new side is provided for scientific research and development
To with good application prospect.
Part is illustrated to embody by further advantage, target and the feature of the present invention by following, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Description of the drawings
Fig. 1 is the working condition chart that engine valve flies off test method.
Fig. 2 is that the verification photo that valve flies off back cylinder cover and piston occurs for engine.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, to enable those skilled in the art with reference to specification text
Word can be implemented according to this.
It should be noted that experimental method described in following embodiments, is conventional method unless otherwise specified, institute
Reagent and material are stated, unless otherwise specified, is commercially obtained.
With reference to Fig. 1, the present invention will be described, and the present invention provides a kind of engine valve and flies off test method, including as follows
Step：
Step 1, preparation before experiment：
Whether checkout facility is normal with engine condition, and development engine is installed on electric power after acknowledgement state is normal surveys
On work(machine testing stand, to development engine carry out warming-up, it is to be tested reach hot with engine after, shut down, carry out cylinder pressure survey
Examination, and related data is recorded, cylinder pressure restores development engine after measuring；
Step 2, process is tested：
(a) vehicle is played, checks development engine idle stability, after without exception, warming-up is carried out to development engine；
(b) it after engine reaches hot, shuts down, the gas supply of open test engine；
(c) using electric dynamometer towing astern development engine, its rotating speed is made uniformly to be risen in 8~11s
3000rpm, air throttle are synchronized to standard-sized sheet；
(d) after stablizing 3s, electric dynamometer rotating speed is adjusted, engine is made to rise very rapidly up to oil-break rotating speed in 3~5s；
(e) reduction of speed after 5~8s of steady running, makes engine be shut down in 10s；
(f) it measures cylinder compression pressure with cylinder pressure table and records data；
(g) the cylinder pressure data before and after contrast test, if cylinder presses pad value to judge not occur under the rotating speed within 5%
Valve flies off phenomenon, continues verification experimental verification；
Step 3, the repeated authentication stage：
(a) the experiment process of step 2 is re-started, during the pending experiment to step 2 during (d) step, with oil-break
Based on rotating speed, 200rpm is incremented by engine speed for step-length to be tested, and is often repeated once, and is incremented by one by step-length of 200rpm
Secondary engine speed；
(b) until the cylinder pressure data cylinder pressure pad value before and after contrast test is more than 5%, then judge that the rotating speed issues angry door
Fly off phenomenon.
Step 4, engine analytic is verified：
(a) development engine is removed and decomposed from electric dynamometer testing stand；
(b) it checks and analyzes development engine cylinder cap sub-unit.
(c) by parsing to development engine, check the state of cylinder cap sub-unit and analyze test data, obtain examination
Test conclusion.
In a technical solution, it is preferred that development engine uniformly rises to the time that rotating speed is 3000rpm and is
10s。
In a technical solution, it is preferred that in step 1 checkout facility with engine condition it is whether normal before, first
Check whether the state of electric dynamometer testing stand and electric dynamometer is normal.
Four groups of valves of engine are tested and verified using above-mentioned test method, wherein engine is commercially available
4G18M2-TA8 h type engine hs, station service power dynamometer machine are the electric dynamometer of HOFMANN companies of Britain AC170HS models, are obtained
Go out the test data such as table 1 and the verification result such as Fig. 2：
Table 1 is 4 groups of valve test datas of engine
Engine after above-mentioned experiment is removed decomposition to verify, is obtained as Fig. 2's as a result, figure it is seen that tearing open
The 3rd group of exhaust valve and the 3rd group of cylinder piston badly broken are found after machine, it can be seen that, the method is practical, this test method
Can quickly judge that limit speed of valve when flying off occurs for engine, available for various model engines valve is flown off into
Row verification experimental verification is assessed.
Although the embodiments of the present invention have been disclosed as above, but its be not restricted in specification and embodiment it is listed
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily
Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, it is of the invention and unlimited
In specific details and legend shown and described herein.
Claims (3)
1. a kind of engine valve flies off test method, which is characterized in that includes the following steps：
Step 1, preparation before experiment：
Whether checkout facility is normal with engine condition, and development engine is installed on electric dynamometer after acknowledgement state is normal
On testing stand, to development engine carry out warming-up, it is to be tested reach hot with engine after, shut down, carry out cylinder pressure test, and
Related data is recorded, cylinder pressure restores development engine after measuring；
Step 2, process is tested：
(a) vehicle is played, checks development engine idle stability, after without exception, warming-up is carried out to development engine；
(b) it after engine reaches hot, shuts down, the gas supply of open test engine；
(c) using electric dynamometer towing astern development engine, its rotating speed is made uniformly to rise to 3000rpm in 8~11s, saved
Valve is synchronized to standard-sized sheet；
(d) after stablizing 3s, electric dynamometer rotating speed is adjusted, engine is made to rise very rapidly up to oil-break rotating speed in 3~5s；
(e) reduction of speed after 5~8s of steady running, makes engine be shut down in 10s；
(f) it measures cylinder compression pressure with cylinder pressure table and records data；
(g) the cylinder pressure data before and after contrast test, if cylinder presses pad value to judge valve does not occur under the rotating speed within 5%
Phenomenon is flown off, continues verification experimental verification；
Step 3, the repeated authentication stage：
(a) the experiment process of step 2 is re-started, during the pending experiment to step 2 during (d) step, with oil-break rotating speed
Based on, 200rpm is incremented by engine speed for step-length to be tested, and is often repeated once, and is incremented by primary hair by step-length of 200rpm
Motivation rotating speed；
(b) until the cylinder pressure data cylinder pressure pad value before and after contrast test is more than 5%, then judge that the rotating speed issues angry door and flies off
Phenomenon；
Step 4, engine analytic is verified：
(a) development engine is removed and decomposed from electric dynamometer testing stand；
(b) it checks and analyzes development engine cylinder cap sub-unit；
(c) by parsing to development engine, check the state of cylinder cap sub-unit and analyze test data, obtain experiment knot
By.
2. engine valve as described in claim 1 flies off test method, which is characterized in that development engine uniformly rises
The time for being 3000rpm to rotating speed is 10s.
3. engine valve as described in claim 1 flies off test method, which is characterized in that checkout facility is used in step 1
Before whether engine condition is normal, first check whether the state of electric dynamometer testing stand and electric dynamometer is normal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610740151.XA CN106338400B (en) | 2016-08-26 | 2016-08-26 | Engine valve flies off test method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610740151.XA CN106338400B (en) | 2016-08-26 | 2016-08-26 | Engine valve flies off test method |
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| Publication Number | Publication Date |
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| CN106338400A CN106338400A (en) | 2017-01-18 |
| CN106338400B true CN106338400B (en) | 2018-06-08 |
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| CN201610740151.XA Active CN106338400B (en) | 2016-08-26 | 2016-08-26 | Engine valve flies off test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116756621A (en) * | 2023-08-11 | 2023-09-15 | 北京理工大学 | On-line diagnosis method for air inlet and outlet faults of engine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818705A (en) * | 2012-08-09 | 2012-12-12 | 哈尔滨东安汽车发动机制造有限公司 | Air valve rebounding test method |
| CN202693311U (en) * | 2012-05-31 | 2013-01-23 | 上海汽车集团股份有限公司 | Valve movement measuring device |
| CN103452677A (en) * | 2013-07-31 | 2013-12-18 | 哈尔滨东安汽车发动机制造有限公司 | Throttle opening auto-control system |
| CN105510044A (en) * | 2015-12-31 | 2016-04-20 | 苏州东菱科技有限公司 | High-speed rotor blade flying-off test device and test method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5758659B2 (en) * | 2011-03-17 | 2015-08-05 | トヨタ自動車株式会社 | Engine test apparatus and engine test method |
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- 2016-08-26 CN CN201610740151.XA patent/CN106338400B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202693311U (en) * | 2012-05-31 | 2013-01-23 | 上海汽车集团股份有限公司 | Valve movement measuring device |
| CN102818705A (en) * | 2012-08-09 | 2012-12-12 | 哈尔滨东安汽车发动机制造有限公司 | Air valve rebounding test method |
| CN103452677A (en) * | 2013-07-31 | 2013-12-18 | 哈尔滨东安汽车发动机制造有限公司 | Throttle opening auto-control system |
| CN105510044A (en) * | 2015-12-31 | 2016-04-20 | 苏州东菱科技有限公司 | High-speed rotor blade flying-off test device and test method |
Non-Patent Citations (1)
| Title |
|---|
| 航空发动机机匣包容试验叶片飞脱方法;郭明明 等;《航空发动机》;20160430;第42卷(第2期);第73-75页 * |
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