CN115126571A - Method for evaluating and solving abnormal sound of plunger type oil-gas separator of engine - Google Patents
Method for evaluating and solving abnormal sound of plunger type oil-gas separator of engine Download PDFInfo
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- CN115126571A CN115126571A CN202210904973.2A CN202210904973A CN115126571A CN 115126571 A CN115126571 A CN 115126571A CN 202210904973 A CN202210904973 A CN 202210904973A CN 115126571 A CN115126571 A CN 115126571A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M2250/00—Measuring
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention discloses a method for evaluating and solving abnormal sound of a plunger type oil-gas separator of an engine, which comprises the following steps: s1, objectively testing the knocking sound and vibration of the PCV valve of the engine, and analyzing an objective value of the knocking sound; s2, punching holes at two ends of the engine PCV, testing pressure fluctuation at two ends of the engine PCV, and analyzing the correlation between the pressure fluctuation and knocking; s3, reducing pressure fluctuation to objectively test the knocking sound and vibration of the PCV valve of the engine, adjusting the valve core quality of the PCV valve of the engine, and/or the spring force, and/or the spring length, and/or the knocking sound and vibration after the valve core is in clearance with the shell, and analyzing the objective value of the knocking sound; s4, performing subjective evaluation on the knock of the PCV of the engine; s5, performing correlation analysis on the subjective evaluation result and the test result to obtain an objective standard of the knocking sound; and S6, designing a reasonable adjustment amount. The invention can improve the sound quality of the engine.
Description
Technical Field
The invention belongs to the technical field of automobile NVH, and particularly relates to a method for evaluating and solving abnormal sound of an engine plunger type oil-gas separator.
Background
With the increasing strictness of emission regulations, new energy automobiles are the inevitable trend, but fuel automobiles are still the main force of the current society because of some technical bottleneck problems. When the engine runs, the mixed gas in the combustion chamber inevitably enters the crankcase through a gap between the cylinder wall and the piston ring, the engine oil is deteriorated in the crankcase after the mixed gas is in the crankcase for a long time, the service life of the engine oil is shortened, and the acidic gas in the mixed gas can accelerate the corrosion of engine parts, for example, the power of the engine is reduced due to the overlarge pressure of the mixed gas, so the mixed gas needs to be led out in time. To avoid these adverse effects, modern engines employ positive crankcase ventilation systems, the most important component of which is the air-oil separator, the core component of which is the engine PCV valve (plunger type).
There are two main types of knock sounds of the plunger engine PCV valve:
(1) engine PCV spool slap valve seat noise: when the engine works, the pressure in the crankcase acts on one end of the engine PCV valve core, which is larger than the sum of the elastic force of the spring and the pressure of the intake manifold acting on the other end of the engine PCV valve core, the engine PCV valve core is opened from a closed state, and the valve core moves to adjust the size of a gap between the valve core and the valve body so as to control the air flow passing through the valve. When the valve core is opened and closed, the valve core and the valve seat knock noise. Because the intake stroke time of a miller cycle engine is shorter relative to the intake stroke time of an otto cycle engine, the valve core is opened and closed more frequently and the impact force of the valve core striking the valve seat is larger, and unacceptable noise is generated more easily under certain operating conditions.
(2) Knocking shell noise of engine PCV valve core: when the valve core is opened to be closed, the head of the valve core is knocked by the shell to generate noise under the influence of air flow, elasticity, pressure and the like.
Aiming at the first type of knocking noise, mainly adjusting the mass of a valve core, the elastic force length of a spring and the like, the conventional method for controlling the knocking noise of the PCV of the engine can effectively reduce the first type of knocking noise; aiming at the second type of knocking noise, the gap between the valve core and the shell is mainly adjusted. The frequency of the knocking sound of the PCV valve of the engine is wide, and when the problem is analyzed, the type of the knocking sound cannot be judged through experience, and the feasibility can be verified only through a plurality of special samples, so that the problem is solved without effective theoretical data support.
Therefore, it is necessary to develop a new method for evaluating and solving the abnormal noise of the plunger type oil-gas separator of the engine.
Disclosure of Invention
The invention aims to provide a method for evaluating and solving abnormal sound of a plunger type oil-gas separator of an engine so as to improve the sound quality of the engine.
The invention discloses a method for evaluating and solving abnormal sound of a plunger type oil-gas separator of an engine, which comprises the following steps of:
s1, objectively testing the knocking sound and vibration of the PCV valve of the engine, and analyzing an objective value of the knocking sound;
s2, punching holes at two ends of the engine PCV, testing pressure fluctuation at two ends of the engine PCV, and analyzing the correlation between the pressure fluctuation and knocking;
s3, reducing pressure fluctuation to objectively test the knocking sound and vibration of the PCV valve of the engine, adjusting the valve core quality of the PCV valve of the engine, and/or the spring force, and/or the spring length, and/or the knocking sound and vibration after the valve core is in clearance with the shell, and analyzing the objective value of the knocking sound;
s4, subjectively evaluating the knock of the PCV valve of the engine and scoring;
s5, performing correlation analysis on the subjective evaluation result and the test result to obtain objective criteria of the knocking sound when the subjective evaluation is satisfactory;
s6, designing reasonable adjustment amount of one or more parameters of pressure fluctuation, clearance, mass and spring force based on the objective knocking sound standard obtained in the step S5 to solve the problem of engine PCV valve knocking sound.
Optionally, in step S1, specifically:
s11, on the engine pedestal, adjusting the operation condition of the engine to the condition that the knocking sound of the PCV valve of the engine is most obvious;
s12, performing a vibration test on the outer shell of the PCV valve of the engine, and simultaneously performing a noise test on the engine side of the installation position of the PCV valve of the engine;
and S13, carrying out noise and vibration analysis on the objective test result, and analyzing the knocking frequency and the corresponding knocking frequency amplitude.
Optionally, the step S2 specifically includes:
s21, forming holes at positions where holes can be punched near two ends of the PCV valve of the engine;
s22, controlling the engine to increase torque from minimum load to maximum load under the abnormal sound rotating speed, testing the pressure change at the two ends of the engine, and calculating the pressure fluctuation of the difference value at the two ends;
s23, selecting more positions at the end of the air inlet manifold to be punched, testing pressure change at two ends of the air inlet manifold from minimum load to maximum load torque rise, and calculating pressure fluctuation of a difference value between the end of a crankcase of a PCV valve of the engine and the end of the air inlet manifold;
s24, analyzing the relevance between pressure fluctuation and knocking according to vibration noise test data corresponding to the pressure fluctuation of the difference value of two ends of the PCV of the engine;
s25, selecting a minimum pressure fluctuation point as an optimal pressure fluctuation point at different positions of the crankcase end and the intake manifold end of the engine PCV valve.
Optionally, the step S3 specifically includes:
s31, on the engine pedestal, adjusting the operation condition of the engine to the condition that the knocking sound of the PCV valve of the engine is most obvious;
s32, performing a vibration test on the outer shell of the PCV valve of the engine, and simultaneously performing a noise test on the engine side of the installation position of the PCV valve of the engine;
and S33, carrying out noise and vibration analysis on the objective test result, and analyzing the knocking frequency and the corresponding knocking frequency amplitude.
Optionally, the step S4 specifically includes:
s41, on the engine pedestal, adjusting the operation condition of the engine to the condition that the knocking sound of the PCV valve of the engine is most obvious;
s42, evaluating the original state, the optimal point of pressure fluctuation and the adjusted knock sound of the PCV valve of the engine to obtain the subjective evaluation scores of each person on the knock sound of the PCV valve of different engines;
and S43, analyzing the evaluation result, eliminating the non-conforming items, and obtaining subjective evaluation scores of the knocking sounds of the PCV valves of different engines.
Optionally, the step S5 is specifically:
s51, performing relevance analysis on objective test results and subjective evaluation scores by using a Minitab tool, and fitting a relevance formula;
and S52, obtaining a standard value of the subjective evaluation 8-time-sharing tapping frequency based on a correlation formula.
Optionally, the step S6 specifically includes:
s61, establishing an analysis model by using minitab software;
and S62, analyzing the relation between the pressure fluctuation, the gap, the mass and the spring force and the knocking energy, and determining the optimal scheme of the pressure fluctuation, the gap, the mass and the spring force.
Optionally, in step S62, the pressure fluctuation, the gap, the spring force and the mass are respectively used as single variables, and when the single variable is analyzed to be optimal, whether the subjective evaluation acceptable level is met is determined; and if the single variable is optimal and the subjective evaluation acceptable level cannot be met, integrating the optimal schemes of the four schemes and determining the optimal scheme of the engine PCV.
The invention has the following advantages: the knocking frequency of the engine PCV valve is confirmed, the knocking principle of the engine PCV valve is obtained through a pressure fluctuation test, and the knocking of the engine PCV valve is improved from the root cause (pressure fluctuation) generated by the problem; the method comprises the steps that the arrangement form of the PCV valve of the engine is integrated, the vibration characteristic is combined, the knocking form of the PCV valve of the engine is confirmed, and the direction is modified according to a pertinence providing scheme; by adopting the correlation analysis of the subjective feeling and the objective result, the actual energy of knocking under different subjective feelings can be accurately obtained, and the blindness of problem rectification is avoided; and the optimal scheme of each influence factor is determined by using minitab analysis software, so that the waste of cost is avoided, and the optimal NVH effect is achieved.
Drawings
FIG. 1 is a schematic diagram of an engine PCV valve arrangement in the present embodiment;
FIG. 2 is a flow chart of the evaluation and correction method in the present embodiment;
FIG. 3 is a flowchart illustrating a guest observation method according to the present embodiment;
FIG. 4 is a flowchart illustrating a pressure fluctuation test across a PCV valve of the engine according to the present embodiment;
FIG. 5 is a flowchart illustrating a subjective evaluation method according to this embodiment;
FIG. 6 is a flowchart of a correlation analysis method according to the present embodiment;
FIG. 7 is a flowchart of a method for designing an engine PCV valve according to the present embodiment.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, a schematic diagram of the engine PCV valve arrangement is shown, and for convenience of explanation, only the portions related to the present embodiment are shown. When the engine is combusted, fresh air enters the air filter and enters the air inlet manifold, and enters the engine together with waste gas entering through the engine PCV valve to be combusted.
As shown in fig. 2, in the present embodiment, a method for evaluating and solving abnormal noise of a plunger type oil-gas separator of an engine includes the following steps:
s1, objectively testing the knocking sound and vibration of the PCV valve of the engine, and analyzing an objective value of the knocking sound;
s2, punching holes at two ends of the engine PCV, testing pressure fluctuation at two ends of the engine PCV, and analyzing the correlation between the pressure fluctuation and knocking;
s3, reducing pressure fluctuation to objectively test the knocking sound and vibration of the PCV valve of the engine, adjusting the valve core mass of the PCV valve of the engine, and/or the spring force, and/or the spring length, and/or the knocking sound and vibration after the gap between the valve core and the shell to objectively test and analyze the objective value of the knocking sound;
s4, subjectively evaluating the knock of the PCV valve of the engine and scoring;
s5, performing correlation analysis on the subjective evaluation result and the test result to obtain objective criteria of the knocking sound when the subjective evaluation is satisfactory;
s6, designing reasonable adjustment amount of one or more parameters of pressure fluctuation, clearance, mass and spring force based on the objective knocking sound standard obtained in the step S5 to solve the problem of engine PCV valve knocking sound.
As shown in fig. 3, in this embodiment, objective testing is performed on the knocking sound and the vibration of the PCV valve of the engine, and an objective value of the knocking sound is analyzed, which specifically includes the following steps:
and S11, on the engine bench, adjusting the operation condition of the engine to the condition that the knock sound of the PCV valve of the engine is most obvious.
And S12, arranging a microphone on the engine side of the installation position of the engine PCV valve, arranging a three-way vibration sensor on the outer shell of the engine PCV valve, and determining that the connection with the NVH test equipment is normal. Noise and vibration acquisition was performed on engine PCV valve slaps that reduced pressure fluctuations and different conditions, and the validity of the test data was checked.
Each condition was tested in 3 groups, each group having a test duration of not less than 16 seconds.
S13, carrying out 1/3 octave frequency spectrum analysis on the objective test result, and analyzing the objective value and the knocking frequency of the objective test result to obtain the frequency spectrum amplitude of the knocking sound energy section of the PCV (positive crankcase ventilation) valve of the engine, wherein the frequency spectrum amplitude only selects the frequency with the largest influence on the knocking sound.
Compared with the analysis of the sound pressure level, the analysis of the tapping sound problem is obviously more applicable to the spectrum analysis, and 1/3 octaves are a method of the spectrum analysis, which is closer to the resolution of the human ear to the frequency, so that a 1/3 octave spectrum analysis method is adopted.
In the embodiment, as shown in fig. 4, holes are punched at two ends of the engine PCV valve, pressure fluctuation at two ends of the engine PCV valve is tested, and the correlation between the pressure fluctuation and knocking is analyzed, which specifically includes the following steps:
and S21, finding out positions where holes can be punched near two ends of the PCV of the engine to punch the holes, and connecting high-precision pressure acquisition equipment at the punched positions by pipes.
And S22, controlling the dynamometer to increase torque from the minimum load to the maximum load corresponding to the rotating speed and testing the pressures at the two ends of the dynamometer under the condition that the engine has obvious abnormal sound rotating speed, and calculating the pressure fluctuation of the pressure difference value at the two ends.
S23, according to experience, selecting a chamber with stable airflow at the end of the air inlet manifold and perforating, wherein a plurality of holes can be drilled at different positions. And under the condition that the engine has obvious abnormal sound and rotating speed, controlling the dynamometer to increase torque from minimum load to maximum load corresponding to the rotating speed, testing the pressures at two ends of the dynamometer, and calculating the pressure fluctuation of the pressure difference value at the two ends.
S24, carrying out time domain comparison analysis on the vibration noise data of the pressure fluctuation at two ends of the PCV of the engine and the knocking moment, analyzing the pressure fluctuation at the knocking moment and the non-knocking moment, and analyzing the relevance of the pressure fluctuation and the knocking through big data.
S25, selecting a minimum pressure fluctuation point at different positions of the crankcase end and the intake manifold end of the engine PCV valve, wherein the minimum pressure fluctuation point is the optimum pressure fluctuation point, and the knocking of the engine PCV valve is also minimum.
Aiming at the first type of knocking noise, mainly adjusting the mass of a valve core, the elastic force length of a spring and the like, the conventional method for controlling the knocking noise of the PCV of the engine effectively reduces the first type of knocking noise; aiming at the second type of knocking noise, the gap between the valve core and the shell is mainly adjusted. According to the two different solutions of knocking noise, the PCV valve of the engine is specially manufactured, and the PCV valve can adjust the mass (large/small) of the valve core, the elastic force (large/small) of the spring, the length (long/short) of the spring and the clearance (large/small) between the valve core and the shell.
In the embodiment, the objective test of knocking sound and vibration of the PCV valve of the engine is carried out by reducing pressure fluctuation, the objective test of the knocking sound and vibration after the valve core mass, and/or the spring force, and/or the spring length, and/or the gap between the valve core and the shell of the PCV valve of the engine is adjusted, and the objective value of the knocking sound is analyzed; the method specifically comprises the following steps:
and S31, testing the engine PCV valve for reducing pressure fluctuation and the adjusted engine PCV valve on the engine bench respectively, and adjusting the operation condition of the engine to the condition that the knocking sound of the engine PCV valve is most obvious.
And S32, arranging a microphone on the engine side of the installation position of the engine PCV valve, arranging a three-way vibration sensor on the outer shell of the engine PCV valve, and determining that the connection with the NVH test equipment is normal. Noise and vibration acquisition was performed on engine PCV valve slaps that reduced pressure fluctuations and different conditions, and the validity of the test data was checked.
Each condition was tested in 3 groups, each group having a test duration of not less than 16 seconds.
S33, carrying out 1/3 octave spectrum analysis on the objective test result to obtain the spectrum amplitude of the knock sound energy section of the PCV valve of the engine, wherein the spectrum amplitude only selects the frequency with the largest influence on the knock sound.
As shown in fig. 5, in the present embodiment, the subjective evaluation and scoring of the knock of the PCV valve of the engine specifically includes the following steps:
s41, on the engine bench, the engine operation condition is adjusted to the condition that the knocking sound of the engine PCV valve is most obvious, and an evaluator stands on the engine side of the installation surface of the engine PCV valve to carry out subjective evaluation.
And S42, applying a subjective evaluation standard, and subjectively evaluating the knocking sound of the PCV valve of the engine in the original state, the optimal point of the pressure fluctuation and the changed state by an evaluator to obtain the subjective evaluation score of each person on the knocking sound of the PCV valve of different engines.
As shown in table 1, subjective evaluation criteria were used, and different scores were assigned to different subjective feelings.
Table 1:
and S43, analyzing the subjective evaluation result, eliminating non-conforming items, and obtaining subjective evaluation scores of the knocking sound of the PCV valves of different engines.
As shown in fig. 6, in this embodiment, the objective criterion of the tapping sound when the subjective evaluation is satisfactory is obtained by performing correlation analysis on the subjective evaluation score and the test result, which specifically includes the following steps:
s51, using a Minitab tool to perform correlation analysis on the objective test result and the subjective evaluation score, determining linear correlation between the objective test result and the subjective evaluation score, and obtaining a correlation formula of the objective test result and the subjective evaluation score.
The correlation coefficient must be greater than 0.85 for the next operation to take place.
If the two are not linearly related, the reliability of the results of the two needs to be examined, and whether data acquisition and subjective evaluation need to be carried out again is determined.
And S52, obtaining a standard value of the subjective evaluation 8-time-sharing tapping frequency based on a correlation formula.
As shown in fig. 7, in this embodiment, designing a reasonable adjustment amount of one or more of the pressure fluctuation, the gap, the mass, and the spring force based on the objective criteria of the knocking sound obtained in step S5, and designing a PCV valve of the engine specifically includes the following steps:
s61, by using minitab software as a tool and adopting a DOE test with partial factors of the software, a partial factor test including pressure fluctuation, gap adjustment, spring elasticity and mass is designed.
And S62, obtaining the optimal scheme of a single variable through correlation analysis of objective test results and subjective evaluation scores in different states. The method respectively takes pressure fluctuation, clearance, spring elasticity and mass as single variables, and judges whether the subjective evaluation acceptable level is met or not when the single variable is analyzed to be optimal. And if the single variable is optimal, the subjective evaluation acceptable level cannot be met, and the optimal scheme of the engine PCV is determined by integrating the optimal schemes of the four schemes.
The method for evaluating and solving the knocking sound of the PCV valve of the engine provided by the embodiment has the beneficial effects that: the 1/3 octave frequency spectrum is adopted for characteristic analysis, so that the characteristic analysis is closer to human perception and can reflect subjective feeling; the correlation analysis is carried out on the subjective feeling and the objective result, the actual energy of knocking under different subjective feelings can be accurately obtained, and the blindness of problem rectification is avoided; analysis is carried out on the knock principle of the engine PCV valve, the direction of problem rectification is guided, the minitab analysis software is used for determining the optimal scheme of the engine PCV valve, the waste of cost is avoided, and the optimal NVH effect is achieved.
The above embodiments are preferred embodiments of the method of the present invention, but the method of the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (8)
1. A method for evaluating and solving abnormal noise of a plunger type oil-gas separator of an engine is characterized by comprising the following steps of:
s1, objectively testing the knocking sound and vibration of the PCV valve of the engine, and analyzing an objective value of the knocking sound;
s2, punching holes at two ends of the engine PCV, testing pressure fluctuation at two ends of the engine PCV, and analyzing the correlation between the pressure fluctuation and knocking;
s3, reducing pressure fluctuation to objectively test the knocking sound and vibration of the PCV valve of the engine, adjusting the valve core quality of the PCV valve of the engine, and/or the spring force, and/or the spring length, and/or the knocking sound and vibration after the valve core is in clearance with the shell, and analyzing the objective value of the knocking sound;
s4, subjectively evaluating the knock of the PCV valve of the engine and scoring;
s5, performing correlation analysis on the subjective evaluation result and the test result to obtain objective criteria of the knocking sound when the subjective evaluation is satisfactory;
s6, designing reasonable adjustment amount of one or more parameters of pressure fluctuation, clearance, mass and spring force based on the objective knocking sound standard obtained in the step S5 to solve the problem of engine PCV valve knocking sound.
2. The method for evaluating and solving the abnormal noise of the plunger type oil-gas separator of the engine according to claim 1, characterized in that: the step S1 specifically includes:
s11, on the engine pedestal, adjusting the operation condition of the engine to the condition that the knocking sound of the PCV valve of the engine is most obvious;
s12, performing a vibration test on the outer shell of the PCV valve of the engine, and simultaneously performing a noise test on the engine side of the installation position of the PCV valve of the engine;
and S13, carrying out noise and vibration analysis on the objective test result, and analyzing the knocking frequency and the corresponding knocking frequency amplitude.
3. The method for evaluating and solving the abnormal noise of the plunger type oil-gas separator of the engine according to claim 2, characterized in that: the step S2 specifically includes:
s21, forming holes at positions where holes can be punched near two ends of the PCV valve of the engine;
s22, controlling the engine to increase torque from minimum load to maximum load under the abnormal sound rotating speed, testing the pressure change at the two ends of the engine, and calculating the pressure fluctuation of the difference value at the two ends;
s23, punching holes at more positions at the end of the air inlet manifold, testing the pressure change at the two ends of the air inlet manifold from minimum load to maximum load, and calculating the pressure fluctuation of the difference value between the end of a crankcase of a PCV valve of the engine and the end of the air inlet manifold;
s24, analyzing relevance between pressure fluctuation and knocking according to vibration noise test data corresponding to pressure fluctuation of difference values at two ends of a PCV (positive crankcase ventilation) valve of the engine;
s25, selecting a minimum pressure fluctuation point as an optimal pressure fluctuation point at different positions of the crankcase end and the intake manifold end of the engine PCV valve.
4. The method for evaluating and solving the abnormal noise of the plunger type oil-gas separator of the engine according to claim 3, is characterized in that: the step S3 specifically includes:
s31, testing the PCV valve of the engine for reducing pressure fluctuation and the adjusted PCV valve of the engine on an engine bench respectively, and adjusting the running working condition of the engine to the working condition with the most obvious knocking sound of the PCV valve of the engine;
s32, performing a vibration test on the outer shell of the PCV valve of the engine, and simultaneously performing a noise test on the engine side of the installation position of the PCV valve of the engine;
and S33, carrying out noise and vibration analysis on the objective test result, and analyzing the knocking frequency and the corresponding knocking frequency amplitude.
5. The method for evaluating and solving the abnormal noise of the plunger type oil-gas separator of the engine according to claim 4, wherein the method comprises the following steps: the step S4 specifically includes:
s41, on the engine pedestal, adjusting the operation condition of the engine to the condition that the knocking sound of the PCV valve of the engine is most obvious;
s42, evaluating the original state, the optimal point of pressure fluctuation and the adjusted knock sound of the PCV valve of the engine to obtain the subjective evaluation scores of each person on the knock sound of the PCV valve of different engines;
and S43, analyzing the evaluation result, eliminating non-conforming items, and obtaining subjective evaluation scores of the knocking sounds of the PCV valves of different engines.
6. The method for evaluating and solving the abnormal noise of the plunger type oil-gas separator of the engine according to claim 5, wherein the method comprises the following steps: the step S5 specifically includes:
s51, performing correlation analysis on objective test results and subjective evaluation results by using a Minitab tool, and fitting a correlation formula;
and S52, obtaining a standard value of the subjective evaluation 8-time-sharing tapping frequency based on a correlation formula.
7. The method for evaluating and solving the abnormal noise of the plunger type oil-gas separator of the engine according to claim 6, wherein the method comprises the following steps: the step S6 specifically includes:
s61, establishing an analysis model by using minitab software;
and S62, analyzing the relation between the pressure fluctuation, the gap, the mass and the spring force and the knocking energy, and determining the optimal scheme of the pressure fluctuation, the gap, the mass and the spring force.
8. The method for evaluating and solving the abnormal noise of the plunger type oil-gas separator of the engine according to claim 7, is characterized in that: in the step S62, the pressure fluctuation, the gap, the spring force and the mass are respectively used as single variables, and when the single variable is analyzed to be optimal, whether the subjective evaluation acceptable level is met is judged; and if the single variable is optimal and cannot meet the acceptable level of subjective evaluation, integrating the optimal schemes of the four schemes to determine the optimal scheme of the engine PCV.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106679970A (en) * | 2016-12-13 | 2017-05-17 | 华南理工大学 | Method and device for dual clutch transmission rattle simulation experiment |
| CN206513436U (en) * | 2017-02-13 | 2017-09-22 | 东风康明斯发动机有限公司 | A kind of timing gear train system for improving engine sound quality |
| CN113640003A (en) * | 2021-08-12 | 2021-11-12 | 哈尔滨东安汽车动力股份有限公司 | Method for measuring PCV valve knocking abnormal sound on engine test bed |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106679970A (en) * | 2016-12-13 | 2017-05-17 | 华南理工大学 | Method and device for dual clutch transmission rattle simulation experiment |
| CN206513436U (en) * | 2017-02-13 | 2017-09-22 | 东风康明斯发动机有限公司 | A kind of timing gear train system for improving engine sound quality |
| CN113640003A (en) * | 2021-08-12 | 2021-11-12 | 哈尔滨东安汽车动力股份有限公司 | Method for measuring PCV valve knocking abnormal sound on engine test bed |
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