CN113223557B - Knock sound optimization method for carbon tank control valve - Google Patents
Knock sound optimization method for carbon tank control valve Download PDFInfo
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- CN113223557B CN113223557B CN202110481728.0A CN202110481728A CN113223557B CN 113223557 B CN113223557 B CN 113223557B CN 202110481728 A CN202110481728 A CN 202110481728A CN 113223557 B CN113223557 B CN 113223557B
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The invention discloses a knocking sound optimization method for a carbon tank control valve, which comprises the following steps of: s1, subjective evaluation and objective test are respectively carried out on the knocking sounds of the carbon tank control valves of a plurality of vehicles of the same vehicle type; s2, analyzing to obtain a correlation formula of subjective evaluation and objective test, and obtaining a knocking energy threshold of the carbon tank control valve when the subjective evaluation reaches a set value according to the correlation formula; and S3, establishing an analysis model of the carbon tank control valve, arranging an expansion cavity between the carbon tank and the carbon tank control valve, and determining the volume and the arrangement position of the expansion cavity based on the knocking energy threshold of the carbon tank control valve obtained in the step S2. The knock level of the carbon tank control valve can be reduced, and the quality of sound in the vehicle is improved.
Description
Technical Field
The invention relates to automobile NVH, in particular to a knock sound optimization method for a carbon tank control valve.
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. Because fuel is volatile, a large amount of fuel vapor is often present in a fuel system, and the fuel vapor cannot be inhibited to be discharged into the atmosphere and cannot cause great harm to the environment, so a carbon tank is installed on a fuel supply system to adsorb the fuel vapor so as to reduce evaporative emission. Canister control valves are also widely used in automobiles to control the flow of a regeneration air stream, introduce fuel vapor into an intake manifold, and utilize the air stream to effect regeneration of activated carbon.
At present, the carbon tank control valve mostly adopts an electromagnetic valve, and knocking sound mainly comprises two types: firstly, the electromagnetic valve is noisy in operation, the electronic control module of the engine controls the on-off of the electromagnetic valve through outputting a pulse width signal when the electromagnetic valve operates, the plunger is opened, and the plunger acts with other parts in the opening and seating processes to generate impact noise. And because six motorcycle types in state design flow is big, the plunger is opened the stroke longer, and evaporation system detects and requires that the disk seat leakproofness is good, needs return spring elasticity higher, and this makes its noise at work higher relatively, and during the product design, through adopting rubber construction at the plunger both ends to reduce the noise of strikeing and improve sealed effect. And secondly, generating gas pulsation in the pipeline in the on-off-on process of the electromagnetic valve, wherein the pulsation impacts the pipeline to form vibration, and knocking noise is generated in the vehicle.
The method of controlling the knocking sound of the carbon tank control valve is that the valve body is mounted on the hose in a hanging mode, the transmission of the knocking sound is avoided, the method can only weaken the transmission of knocking energy of the carbon tank control valve body, namely the first type of knocking noise is generated, but the impact generated by gas pulse has no effect, and the isolation difficulty of the structural sound is large because the carbon tank control valve is long to a carbon tank pipeline, and all hanging processing is unreal. If the second type of knocking noise needs to be solved, a rubber pipe can be used for replacing a nylon pipe, the cost is increased, and risks such as fuel leakage exist.
The knocking sound frequency of the carbon tank control valve is wide, when a problem is evaluated, only a single frequency is evaluated, subjective feeling cannot be completely reflected, the possibility of misleading the problem evaluation result exists, and an evaluation and optimization method for the knocking sound of the carbon tank control valve is urgently needed.
Disclosure of Invention
The invention aims to provide a knocking sound optimization method for a carbon tank control valve, which can reduce the knocking sound level of the carbon tank control valve and improve the sound quality in a vehicle.
The invention discloses a knocking sound optimization method for a carbon tank control valve, which comprises the following steps of:
s1, subjective evaluation and objective test are respectively carried out on the knocking sounds of the carbon tank control valves of a plurality of vehicles of the same vehicle type;
s2, analyzing to obtain a correlation formula of subjective evaluation and objective test, and obtaining a knocking energy threshold of the carbon tank control valve when the subjective evaluation reaches a set value according to the correlation formula;
and S3, establishing an analysis model of the carbon tank control valve, arranging an expansion cavity between the carbon tank and the carbon tank control valve, and determining the volume and the arrangement position of the expansion cavity based on the knocking energy threshold of the carbon tank control valve obtained in the step S2.
Further, the subjective evaluation in S1 is specifically: adopting a 10-system scoring method, wherein the higher the score is, the higher the satisfaction is, and scoring is carried out on the knocking sound of the carbon tank control valve of the vehicle by an evaluator according to subjective feeling;
the objective test specifically comprises: a sensor is arranged at the position of the right ear of a driver in the vehicle to acquire test data, 1/3 octaves of frequency spectrum analysis are carried out on the test data to obtain the frequency spectrum amplitude of the knocking sound energy section of the carbon tank control valve, the frequency with the largest influence on the knocking sound is selected, and the knocking energy corresponding to the frequency is calculated.
Further, the volume of the expansion chamber is determined specifically as follows: in the analysis model, the volume of the expansion cavity is used as a single variable, CAE analysis software is adopted to analyze the variation trend of the knocking energy of the carbon tank control valve along with the volume variation of the expansion cavity, the knocking energy is not more than the knocking energy threshold value of the carbon tank control valve of S2, and the volume of the expansion cavity is determined by comprehensively considering the cost.
Further, the arrangement position of the expansion cavity is determined specifically as follows: and (3) taking the arrangement position of the expansion cavity as a single variable in the analysis model, adopting CAE analysis software to analyze the variation trend of the knocking energy of the carbon tank control valve along with the variation of the arrangement position of the expansion cavity, ensuring that the knocking energy is not greater than the knocking energy threshold of the carbon tank control valve of S2, and determining the arrangement position of the expansion cavity.
Further, there is a difference in the knock sound of the canister control valves of the plurality of vehicles.
The method and the device respectively carry out subjective evaluation and objective test on the knocking sound of the carbon tank control valves of a plurality of vehicles of the same vehicle type, obtain a correlation formula through correlation analysis, obtain actual knocking energy under different subjective evaluations according to the correlation formula, further set the lowest value of the subjective evaluations according to actual requirements, further determine the knocking energy threshold of the carbon tank control valves, and provide direction for the optimization and rectification of a subsequent fuel system. And the expansion cavity between the carbon tank and the carbon tank control valve is optimized according to the obtained knocking energy threshold value of the carbon tank control valve, the comprehensive cost consideration is carried out, the knocking energy is not more than the knocking energy threshold value of the carbon tank control valve, the cost waste can be avoided, the knocking sound level of the carbon tank control valve can be reduced, and the sound quality in the vehicle is improved.
The invention carries out 1/3 octave frequency spectrum analysis on the test data, is closer to the perception of human ears, further can reflect subjective feeling, and improves the accuracy of subjective evaluation and objective test correlation analysis.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic diagram of the fuel system of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the knock optimization method for the canister control valve includes the following steps:
and S1, selecting 10 vehicles of the same vehicle type, and performing subjective evaluation and objective test on the knocking sounds of the carbon tank control valves of the vehicles respectively, wherein the selected knocking sounds of the carbon tank control valves of the vehicles are different and the selected number is not less than 10 in order to ensure that a subsequent correlation formula is more accurate.
The subjective evaluation specifically comprises the following steps: and an evaluator is positioned at the position of a driver, under the condition of judging that the carbon tank control valve works, the subjective evaluation standard shown in the table 1 is referred, a 10-system scoring method is adopted, the higher the score is, the higher the satisfaction degree is, and the evaluator scores the knocking sounds of the carbon tank control valves of the vehicles of the same vehicle type with the difference of the selected 10 knocking sounds according to the subjective feeling, so that the subjective scores of the knocking sounds of the carbon tank control valves of the 10 vehicles are respectively obtained.
Preferably, the subjective evaluation is performed in a quieter environment, avoiding interference from the environment and other personnel.
TABLE 1 subjective evaluation criteria
The objective test specifically comprises: and arranging a sensor at the position of the right ear of a driver in the automobile to acquire test data, and determining that the connection with the NVH test equipment is normal. Under the condition that the carbon tank control valve works, test data of the position of the right ear of a driver in the vehicle are collected respectively, the validity of the test data is detected, each vehicle tests 3 groups, and the test time of each group is not less than 16 seconds. And then carrying out 1/3 octave spectrum analysis on the test data to obtain the spectrum amplitude of the knocking sound energy section of the carbon tank control valve, selecting the frequency with the maximum influence on the knocking sound and calculating the knocking energy corresponding to the frequency.
Compared with the analysis of the sound pressure level, the analysis of the problem of the knocking sound is obviously more suitable for the spectrum analysis, and the 1/3 octave is a method of the spectrum analysis, which is closer to the resolution of the human ear to the frequency, and further more reflects the subjective feeling.
And S2, performing correlation analysis on the subjective evaluation score and the objective test result by adopting a Minitab workpiece, determining the linear correlation between the objective test result and the subjective evaluation score, and obtaining a correlation formula of the subjective evaluation score and the objective test result. It should be noted that, in order to ensure the accuracy of the result, the correlation coefficient in the correlation formula is not less than 0.85, otherwise, subjective evaluation and objective test are performed again. If the objective test result is not linearly related to the subjective evaluation score, the reliability of the objective test result and the subjective evaluation score is rechecked, and whether the subjective evaluation and the objective test are needed to be carried out again is determined.
Obtaining the knocking frequency of the carbon tank control valve with the subjective evaluation of 8 time-sharing according to a correlation formula, analyzing to obtain the knocking energy corresponding to the knocking frequency, and taking the corresponding knocking energy as the knocking energy threshold of the carbon tank control valve;
and S3, referring to FIG. 2, connecting the air outlet of the oil tank with an air inlet of the carbon tank, connecting the other air inlet of the carbon tank with the atmosphere, connecting the air outlet of the carbon tank with a carbon tank control valve through a pipeline, connecting the carbon tank control valve with the air inlet manifold, and installing the carbon tank control valve on the air inlet manifold. And determining the volume and the arrangement position of the expansion cavity based on the carbon tank control valve knocking energy threshold obtained in the step S2.
The method comprises the steps of establishing an analysis model of a carbon tank control valve by adopting Amesim software, establishing a gas-solid coupling model of an evaporation discharge system by adopting a pneumatic library and a signal library which are carried by the software, simulating the carbon tank control valve by using a variable throttling hole, simulating the carbon tank by using a fixed volume unit, and simulating a carbon tank control valve control circuit by using a function generator.
The volume of the expansion chamber is determined specifically as follows: and in the analysis model, the volume of the expansion cavity is taken as a single variable, CAE analysis software is adopted to analyze the variation trend of the knocking energy of the carbon tank control valve along with the volume variation of the expansion cavity, the knocking energy is not more than the knocking energy threshold of the carbon tank control valve of S2, and the volume of the expansion cavity is determined by considering the comprehensive cost.
The arrangement position of the expansion cavity is determined specifically as follows: and (3) taking the arrangement position of the expansion cavity as a single variable in the analysis model, adopting CAE analysis software to analyze the variation trend of the knocking energy of the carbon tank control valve along with the variation of the arrangement position of the expansion cavity, ensuring that the knocking energy is not greater than the knocking energy threshold of the carbon tank control valve of S2, and determining the arrangement position of the expansion cavity.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (3)
1. A knocking sound optimization method for a carbon tank control valve is characterized by comprising the following steps:
s1, subjective evaluation and objective test are respectively carried out on the knocking sounds of the carbon tank control valves of a plurality of vehicles of the same vehicle type;
s2, analyzing to obtain a correlation formula of subjective evaluation and objective test, and obtaining a knocking energy threshold of the carbon tank control valve when the subjective evaluation reaches a set value according to the correlation formula;
s3, establishing an analysis model of the carbon tank control valve, arranging an expansion cavity between the carbon tank and the carbon tank control valve, and determining the volume and the arrangement position of the expansion cavity based on the knocking energy threshold of the carbon tank control valve obtained in the step S2;
the volume of the expansion chamber is determined in particular as follows: in the analysis model, the volume of the expansion cavity is taken as a single variable, CAE analysis software is adopted to analyze the variation trend of the knocking energy of the carbon tank control valve along with the volume variation of the expansion cavity, the knocking energy is not more than the knocking energy threshold of the carbon tank control valve of S2, and the volume of the expansion cavity is determined by considering the comprehensive cost;
the arrangement position of the expansion cavity is determined specifically as follows: and (3) taking the arrangement position of the expansion cavity as a single variable in the analysis model, adopting CAE analysis software to analyze the variation trend of the knocking energy of the carbon tank control valve along with the variation of the arrangement position of the expansion cavity, ensuring that the knocking energy is not greater than the knocking energy threshold of the carbon tank control valve of S2, and determining the arrangement position of the expansion cavity.
2. The knock sound optimization method for a canister control valve according to claim 1, wherein the subjective evaluation in S1 is specifically: adopting a 10-system scoring method, wherein the higher the score is, the higher the satisfaction is, and scoring is carried out on the knocking sound of the carbon tank control valve of the vehicle by an evaluator according to subjective feeling;
the objective test specifically comprises: a sensor is arranged at the position of the right ear of a driver in the vehicle to acquire test data, 1/3 octaves of frequency spectrum analysis are carried out on the test data to obtain the frequency spectrum amplitude of the knocking sound energy section of the carbon tank control valve, the frequency with the largest influence on the knocking sound is selected, and the knocking energy corresponding to the frequency is calculated.
3. The knock sound optimization method for a canister control valve according to claim 1 or 2, wherein: the knocking sounds of the canister control valves of the plurality of vehicles are different.
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| CN202110481728.0A CN113223557B (en) | 2021-04-30 | 2021-04-30 | Knock sound optimization method for carbon tank control valve |
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| CN202110481728.0A CN113223557B (en) | 2021-04-30 | 2021-04-30 | Knock sound optimization method for carbon tank control valve |
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