CN114718780B - Method and system for reducing noise and vehicle - Google Patents
Method and system for reducing noise and vehicle Download PDFInfo
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- CN114718780B CN114718780B CN202110015254.0A CN202110015254A CN114718780B CN 114718780 B CN114718780 B CN 114718780B CN 202110015254 A CN202110015254 A CN 202110015254A CN 114718780 B CN114718780 B CN 114718780B
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000001514 detection method Methods 0.000 claims description 12
- 239000000110 cooling liquid Substances 0.000 claims description 9
- 230000009467 reduction Effects 0.000 claims description 7
- 238000002485 combustion reaction Methods 0.000 abstract description 32
- 239000000446 fuel Substances 0.000 description 19
- 238000004590 computer program Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000002826 coolant Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
- F02M35/1205—Flow throttling or guiding
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
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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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The embodiment of the application relates to a method, a system and a vehicle for reducing noise, and belongs to the technical field of vehicles. The method comprises the following steps: detecting the working state of the vehicle; and controlling the opening degree of a throttle valve connected with an engine of the vehicle to be reduced to a preset opening degree under the condition that the working state of the vehicle is identified as an idle state, wherein the engine is a diesel engine. By using the method, the system and the vehicle for reducing noise, energy generated by combustion can not excite the vibration frequency on the engine structure, so that the resonance phenomenon is avoided, and combustion noise is reduced.
Description
Technical Field
The embodiment of the application relates to the technical field of vehicles, in particular to a method and a system for reducing noise and a vehicle.
Background
NVH performance (Noise, vibration, harshness), i.e., noise, vibration and harshness of a vehicle, is a comprehensive problem in measuring the manufacturing quality of the vehicle, and the quality of NVH performance has been one of the important conditions for the user to choose vehicles.
In a diesel engine, the pressure of in-cylinder gas generated by combustion of a mixture directly excites a corresponding engine structure, and the pressure is transmitted to the engine surface through propagation paths such as propagation of the engine structure or propagation paths such as air propagation, and air noise formed on the engine surface is combustion noise.
At present, the noise generated by the diesel engine under the idle working condition is large, so that the experience of a user is poor.
Disclosure of Invention
The embodiment of the application provides a method, a system and a vehicle for reducing noise, which aim to solve the problem of large noise under an idle working condition.
A first aspect of an embodiment of the present application provides a method for reducing noise, the method including:
detecting the working state of the vehicle;
and controlling the opening degree of a throttle valve connected with an engine of the vehicle to be reduced to a preset opening degree under the condition that the working state of the vehicle is identified as an idle state, wherein the engine is a diesel engine.
Optionally, the value of the preset opening is greater than or equal to 6% and less than or equal to 16%.
Optionally, the preset opening is determined by:
detecting the sound intensity of the engine under different opening degrees of the throttle valve when the vehicle is in an idle state;
counting the sound intensities emitted by the engine under different opening degrees of the throttle valve to obtain a target opening degree corresponding to the condition that the sound intensity emitted by the engine is smaller than a preset sound intensity;
and taking the target opening as the preset opening.
Optionally, detecting the sound intensity of the engine under different opening degrees of the throttle valve further includes:
detecting the vibration intensity of the engine under different opening degrees of the throttle valve;
the method for obtaining the target opening corresponding to the sound intensity emitted by the engine is smaller than the preset sound intensity comprises the following steps:
and obtaining a target opening corresponding to the sound intensity emitted by the engine being smaller than the preset sound intensity and the vibration intensity being smaller than the preset vibration intensity.
Optionally, the method further comprises: and increasing the temperature of the engine coolant while reducing the opening of the throttle valve of the vehicle until the temperature of the engine coolant is greater than a preset temperature.
A second aspect of embodiments of the present application provides a system for reducing noise, the system comprising:
the detection module is used for detecting the working state of the vehicle;
and the control module is used for controlling the opening degree of a throttle valve connected with the vehicle engine to be reduced to a preset opening degree under the condition that the working state of the vehicle is identified to be an idle state, wherein the engine is a diesel engine.
Optionally, the value of the preset opening is greater than or equal to 6% and less than or equal to 16%.
Optionally, the control module includes:
the sound intensity detection module is used for detecting the sound intensity of the engine under different opening degrees of the throttle valve when the vehicle is in an idle state;
the statistics module is used for carrying out statistics on sound intensity emitted by the engine under different opening degrees of the throttle valve, and obtaining a target opening degree corresponding to the condition that the sound intensity emitted by the engine is smaller than a preset sound intensity;
and the first determining module is used for taking the target opening as the preset opening.
Optionally, the sound intensity detection module includes:
the vibration detection module is used for detecting the vibration intensity of the engine under different opening degrees of the throttle valve;
the statistics module comprises: and the second determining module is used for obtaining the target opening degree corresponding to the condition that the sound intensity emitted by the engine is smaller than the preset sound intensity and the vibration intensity is smaller than the preset vibration intensity.
A third aspect of the embodiments of the present application provides a vehicle comprising a noise reduction system as provided in the second aspect of the embodiments of the present application.
By adopting the method for reducing noise, when the vehicle is identified to be in the idle state, the opening of the throttle valve of the vehicle engine is controlled to be the preset opening, so that the opening of the throttle valve at the moment is different from the opening of the throttle valve of the vehicle in the idle state in the prior art. When the current opening of the throttle valve is the preset opening, the gas entering the diesel engine is changed, so that the combustion speed of fuel in the diesel engine is changed, the energy generated during fuel combustion is reduced, the vibration frequency generated at the position of a lower timing cover cap and the like on the diesel engine cannot be excited by the energy generated during fuel combustion, the resonance phenomenon is reduced, the combustion noise is reduced at the source, and the user experience is improved. For example, in the prior art, the opening degree of the throttle valve of the vehicle in the idle state is 100%, and the opening degree of the throttle valve can be reduced, so that the air entering the engine is reduced, the energy generated during fuel combustion is further reduced, after the energy generated during fuel combustion is reduced, the structure of the lower timing cover cap and the like on the diesel engine is insufficient to be excited, the resonance phenomenon is reduced, and the user experience is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments of the present application will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart illustrating a method for reducing noise according to an embodiment of the present application;
FIG. 2 is a graph of throttle opening versus engine sound intensity as set forth in an embodiment of the present application;
FIG. 3 is a graph of throttle opening versus engine emitted vibration intensity as set forth in one embodiment of the present application;
FIG. 4 is a graph of crank angle versus cylinder pressure before throttle opening is not reduced in accordance with an embodiment of the present application;
fig. 5 is a graph showing a relationship between a crank angle and a cylinder pressure after reducing a throttle opening according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the related art, noise generated by a diesel engine under an idle condition is large, and thus, the applicant has studied the cause of noise generation of the diesel engine under the idle condition.
Firstly, the applicant finds that under the idle working condition, the vibration frequency generated by the combustion of fuel in the diesel engine is in the range of the middle frequency and the high frequency range, the middle frequency range is between 300Hz and 1000Hz, and the high frequency range is above 1000 Hz; secondly, the applicant carries out modal calculation analysis on the diesel engine, and finds that the vibration with the frequency of 500 Hz-700 Hz can be generated at the lower timing cover of the diesel engine; vibration with the frequency of 1000 Hz-1700 Hz can be generated at the joint of the timing side of the oil pan of the diesel engine and the oil pump; vibrations of frequencies between 1100Hz and 1400Hz are generated on the timing side of the diesel engine; vibrations at 1700Hz are generated at the intake and exhaust ends of the diesel engine.
Because the resonance phenomenon is generated by two objects with similar frequencies, the intermediate frequency range generated by the combustion of fuel is between 300Hz and 1000Hz, and resonance can occur between the intermediate frequency range and the vibration with the frequency of 500Hz to 700Hz generated by the lower timing cover of the diesel engine; the high-frequency band frequency generated by the fuel combustion is above 1000Hz, and resonance can be generated between the junction of the timing side of the oil pan of the diesel engine and the oil pump, the timing side of the diesel engine and the air inlet end and the air outlet end of the diesel engine (the vibration frequency is above 1000 Hz). And the generation of resonance at the middle frequency band and the high frequency band can generate larger combustion noise.
Based on this, the present application devised a method for reducing noise, applied to a diesel engine, the method comprising: detecting the working state of the vehicle; and controlling the opening degree of a throttle valve connected with an engine of the vehicle to be a preset opening degree when the working state of the vehicle is identified as an idle state, wherein the engine is a diesel engine.
By controlling the opening degree of the throttle valve of the vehicle engine to be the preset opening degree when the vehicle is identified to be in the idle state, the opening degree of the throttle valve at the moment can be reduced from the opening degree of the throttle valve of the vehicle in the idle state in the prior art. When the current opening of the throttle valve is reduced to the preset opening, gas entering the diesel engine is changed, so that energy generated by combustion of fuel in the diesel engine is reduced, vibration frequency generated by positions such as a lower timing cover cap and the like on the diesel engine is insufficient to be excited by the energy generated by the combustion of the fuel, resonance is reduced, combustion noise is reduced from the source, and user experience is improved.
Example 1
Referring to fig. 1, a method of reducing noise is shown, the method comprising:
step S1: the operating state of the vehicle is detected.
In this step, the vehicle has various operating states, such as an acceleration state, a deceleration state, an idle state, and the like. In contrast, since a vehicle using a diesel engine generates a large noise in an idle state, it is necessary to detect the operating state of the vehicle to detect whether the vehicle is in the idle state, and to perform the subsequent execution steps in the idle state.
The idling state refers to an operating condition of the diesel engine of the vehicle when idling.
Step S2: and controlling the opening degree of a throttle valve connected with an engine of the vehicle to be reduced to a preset opening degree under the condition that the working state of the vehicle is identified as an idle state, wherein the engine is a diesel engine.
In this step, when it is identified that the vehicle is in an idle state, the opening of the throttle valve may be reduced to a preset opening, and the value of the preset opening may be in a section of greater than or equal to 6% and less than or equal to 16%.
For example, in the conventional scheme, when the vehicle is in an idle state, the throttle valve on the diesel engine is at 100% opening, and the resonance phenomenon occurs at this time; after the scheme is used, the throttle opening degree on the diesel engine can be reduced to be in the interval of 6-16% when the vehicle is in an idle state. Therefore, the gas entering the diesel engine is reduced, the combustion speed of the fuel is reduced, for example, the vibration intensity generated by the fuel combustion at the middle frequency range of 300 Hz-1000 Hz is reduced to avoid the vibration intensity/energy generated by vibration generated by resonance, or the vibration intensity generated by the fuel combustion at the high frequency range of more than 1000Hz is reduced to avoid the vibration intensity generated by resonance, and the like, after the vibration intensity at the frequency ranges is reduced, the vibration intensity is insufficient to excite the structure of the diesel engine to generate vibration, the resonance phenomenon is not generated between the structure and the structure on the corresponding engine body, and the combustion noise is greatly reduced. Further, since it is not necessary to supply a large amount of gas to maintain normal running of the vehicle when the vehicle is in an idle state, the vehicle is not affected even after the throttle opening is reduced from 100% to 6% to 16%.
In addition, the applicant has found that, in addition to resonating with a part of the structure on the diesel engine, the fuel itself gives off a relatively noticeable noise like "rattle" of combustion in the cylinder when combusted.
Based on the reduction of the throttle opening, the gas entering the diesel engine can be reduced, thereby reducing the energy generated by the combustion of the fuel per se per unit time, and reducing the in-cylinder combustion noise generated by the combustion of the fuel.
Wherein step S2 may comprise the sub-steps of:
substep S21: and detecting the sound intensity of the engine under different opening degrees of the throttle valve when the vehicle is in an idle state.
In this step, the relationship map between the throttle opening and the engine sound intensity shown with reference to fig. 2 can be obtained by changing the opening of the throttle valve, for example, gradually decreasing the opening of the throttle valve from 100% to 9% in the idle state of the vehicle.
When the vehicle is in an idle state, not only the sound intensity of the engine under different opening degrees of the throttle valve, but also the vibration intensity of the engine under different opening degrees of the throttle valve can be detected.
Substep S22: and counting the sound intensity emitted by the engine under different opening degrees of the throttle valve to obtain a target opening degree corresponding to the condition that the sound intensity emitted by the engine is smaller than the preset sound intensity.
In this step, referring to fig. 2, it is found that, in the process of decreasing the throttle opening, when the throttle opening is in the interval of 16% to 100%, the sound intensity of the engine is substantially in a stationary state; when the throttle opening is in the interval of 10% to 16%, the sound intensity of the engine increases with the increase of the throttle opening; when the throttle opening is less than 10%, the sound intensity of the engine increases with a decrease in the throttle opening, and the operation of the engine becomes unstable.
As shown in fig. 2, the preset sound intensity may be 71.1dB, and the corresponding target opening is 16% at the preset sound intensity.
In addition, in the step, the target opening degree corresponding to the condition that the sound intensity emitted by the engine is smaller than the preset sound intensity and the vibration intensity is smaller than the preset vibration intensity can be obtained. The map of the throttle opening versus the vibration intensity of the engine shown with reference to fig. 3 can be obtained by changing the opening of the throttle, for example, gradually decreasing the opening of the throttle from 100% to 9% in the idle state of the vehicle.
Referring to fig. 2 and 3, if the preset sound intensity of the engine is 71.1dB and the preset vibration intensity of the engine is 0.85g, when the sound intensity of the engine is less than 71.1dB and the vibration intensity of the engine is less than 0.85g, the opening degree of the throttle valve is 16% at this time, and 16% is the target opening degree.
In this step, since there are a plurality of sound intensities emitted from the obtained engine that are smaller than the preset sound intensity and a plurality of vibration intensities emitted from the engine that are smaller than the preset vibration intensity, there are a plurality of different target openings naturally corresponding to each other based on different sound intensities and vibration intensities. The number of different target openings may include 16% throttle opening, 13% throttle opening, or 10% throttle opening.
In the present application, the combustion state of the fuel in the diesel engine may be changed with the target opening degrees as the preset opening degrees, and the effect of reducing the combustion noise may be achieved.
Substep S23: and taking the target opening as the preset opening.
In this step, the throttle opening degree may be adjusted when the vehicle is in the idle state, with the opening degree at which the target opening degree is 16% or less as the preset opening degree.
However, since the engine starts to operate unstably after the target opening degree is reduced to less than 10%, the throttle opening degree can be controlled to be within a range of 10% to 16% in the idle state, and thus the occurrence of the resonance phenomenon can be reduced without affecting the engine operation, and the combustion noise can be reduced.
Referring to fig. 2 and 3, it can be seen that the sound intensity emitted from the engine and the vibration intensity emitted from the engine gradually increase as the throttle opening increases in the interval of 10% to 16%, and thus the greater the combustion noise it generates. Based on the consideration of the best noise reduction effect, when the opening of the throttle valve is adjusted to 10%, the sound intensity and the vibration intensity emitted by the engine are in the lowest state, and the noise reduction effect of the vehicle in the idle state is the best.
Taking 10% opening as an example, referring to fig. 4, there is shown a graph of the relationship between crank angle and cylinder pressure before the throttle opening is not changed, that is, when the throttle opening is 100%, it can be seen that the maximum value of cylinder pressure in the engine cylinder is about 40 bar; in contrast, after changing the throttle opening, i.e., after changing the throttle opening from 100% to 10% of the throttle opening, referring to fig. 5, the maximum value of the cylinder pressure in the engine cylinder is about 27bar, and the air pressure in the engine cylinder is significantly reduced, so that the intensity of the engine vibration is reduced. Under the condition that the opening of the throttle valve is 10%, the vibration intensity generated by fuel combustion at the middle-frequency band and high-frequency band vibration frequency can be greatly reduced, so that most of the surface structures of the diesel engine are not sufficiently excited, the occurrence of the resonance phenomenon of most of the surface structures of the diesel engine is avoided, the combustion noise is reduced, and the user experience is improved.
In the above steps, it is emphasized that combustion noise can be reduced for a vehicle using a diesel engine as a power source based on a decrease in the throttle opening in an idle state, and after the decrease in the throttle opening, adjustment of the temperature of the coolant related to the diesel engine is required in order to secure normal operation of the diesel engine.
Therefore, in order to ensure the normal operation of the diesel engine, a method for reducing noise further includes: and increasing the temperature of the cooling liquid of the engine while reducing the opening degree of a throttle valve of the vehicle until the temperature of the cooling liquid of the engine is greater than a preset temperature. For example, the preset temperature may be 50 ℃.
In the present embodiment, if the temperature of the coolant of the diesel engine is low, the torque demand of the diesel engine is increased, and more gas is required to supply fuel in the diesel engine, and if the temperature of the coolant of the diesel engine is low, the opening degree of the throttle valve is reduced, the gas entering the diesel engine is certainly reduced, and the vibration of the diesel engine is increased.
Therefore, when the opening degree of the throttle valve is reduced, the temperature of the cooling liquid of the diesel engine can be increased, so that the torque demand of the diesel engine is smaller, the air inflow required by the diesel engine is relatively smaller, and the normal operation of the diesel engine is further met.
Example two
Based on the same inventive concept, another embodiment of the present application provides a system for reducing noise, the system comprising:
the detection module is used for detecting the working state of the vehicle;
and the control module is used for controlling the opening degree of a throttle valve connected with the vehicle engine to be reduced to a preset opening degree under the condition that the working state of the vehicle is identified to be an idle state, wherein the engine is a diesel engine.
In a possible embodiment, the preset opening is greater than or equal to 10% and less than or equal to 16%.
In a possible embodiment, the control module includes:
the sound intensity detection module is used for detecting the sound intensity of the engine under different opening degrees of the throttle valve when the vehicle is in an idle state;
the statistics module is used for carrying out statistics on sound intensity emitted by the engine under different opening degrees of the throttle valve, and obtaining a target opening degree corresponding to the condition that the sound intensity emitted by the engine is smaller than a preset sound intensity;
and the first determining module is used for taking the target opening as the preset opening.
In a possible embodiment, the sound intensity detection module includes:
the vibration detection module is used for detecting the vibration intensity of the engine under different opening degrees of the throttle valve;
the statistics module comprises: and the second determining module is used for obtaining the target opening degree corresponding to the condition that the sound intensity emitted by the engine is smaller than the preset sound intensity and the vibration intensity is smaller than the preset vibration intensity.
In a possible embodiment, the system further comprises:
and the temperature lifting module is used for lifting the temperature of the engine cooling liquid while reducing the opening degree of a throttle valve of the vehicle until the temperature of the engine cooling liquid is greater than a preset temperature.
Example III
Based on the same inventive concept, another embodiment of the present application provides a vehicle including a noise reduction system as provided in embodiment two of the present application.
In the present embodiment, the vehicle is mainly a diesel engine powered vehicle, such as a tractor.
For the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments for relevant points.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
It will be apparent to those skilled in the art that embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, the present embodiments may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present embodiments have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the present application.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or terminal device comprising the element.
The foregoing has outlined a detailed description of a method, system and vehicle for noise reduction in the present application, wherein specific examples are provided herein to illustrate the principles and embodiments of the present application, the above examples being provided solely to assist in the understanding of the method and core concepts of the present application; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Claims (5)
1. A method of reducing noise, the method comprising:
detecting the working state of the vehicle;
controlling the opening degree of a throttle valve connected with an engine of the vehicle to be reduced to a preset opening degree under the condition that the working state of the vehicle is identified as an idle state, and increasing the temperature of cooling liquid of the engine until the temperature of the cooling liquid of the engine is greater than the preset temperature, wherein the engine is a diesel engine;
the preset opening degree is determined by the following steps:
detecting the vibration intensity of the engine and the sound intensity of the engine under different opening degrees of the throttle valve when the vehicle is in an idle state;
counting the sound intensities emitted by the engine under different opening degrees of the throttle valve to obtain a target opening degree corresponding to the condition that the sound intensity emitted by the engine is smaller than a preset sound intensity and the vibration intensity is smaller than the preset vibration intensity;
and taking the target opening as the preset opening.
2. The method of reducing noise according to claim 1, wherein the preset opening has a value of greater than or equal to 6% and less than or equal to 16%.
3. A system for reducing noise, the system comprising:
the detection module is used for detecting the working state of the vehicle;
the control module is used for controlling the opening degree of a throttle valve connected with the vehicle engine to be reduced to a preset opening degree and improving the temperature of cooling liquid of the engine until the temperature of the cooling liquid of the engine is greater than a preset temperature under the condition that the working state of the vehicle is identified as an idle state, wherein the engine is a diesel engine;
the control module includes:
the sound intensity detection module is used for detecting the sound intensity of the engine under different opening degrees of the throttle valve when the vehicle is in an idle state;
the sound intensity detection module comprises: the vibration detection module is used for detecting the vibration intensity of the engine under different opening degrees of the throttle valve;
the statistics module is used for carrying out statistics on sound intensity emitted by the engine under different opening degrees of the throttle valve to obtain a target opening degree corresponding to the condition that the sound intensity emitted by the engine is smaller than a preset sound intensity and the vibration intensity is smaller than the preset vibration intensity;
and the first determining module is used for taking the target opening as the preset opening.
4. A system for reducing noise according to claim 3, wherein the preset opening has a value of greater than or equal to 6% and less than or equal to 16%.
5. A vehicle comprising a noise reduction system according to any one of claims 3 to 4.
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| CN202110015254.0A CN114718780B (en) | 2021-01-06 | 2021-01-06 | Method and system for reducing noise and vehicle |
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| CN202110015254.0A CN114718780B (en) | 2021-01-06 | 2021-01-06 | Method and system for reducing noise and vehicle |
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| CN114718780B true CN114718780B (en) | 2024-04-16 |
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| CN107559096A (en) * | 2016-06-30 | 2018-01-09 | 长城汽车股份有限公司 | Diesel engine control method and system |
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