CN115199510A - Noise control method for electric compressor of new energy automobile - Google Patents
Noise control method for electric compressor of new energy automobile Download PDFInfo
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- CN115199510A CN115199510A CN202210899339.4A CN202210899339A CN115199510A CN 115199510 A CN115199510 A CN 115199510A CN 202210899339 A CN202210899339 A CN 202210899339A CN 115199510 A CN115199510 A CN 115199510A
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000000725 suspension Substances 0.000 claims abstract description 45
- 230000005284 excitation Effects 0.000 claims abstract description 5
- 230000010349 pulsation Effects 0.000 claims description 26
- 230000001133 acceleration Effects 0.000 claims description 25
- 238000001816 cooling Methods 0.000 claims description 19
- 229910052717 sulfur Inorganic materials 0.000 claims description 12
- 239000011593 sulfur Substances 0.000 claims description 12
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 11
- 238000004132 cross linking Methods 0.000 claims description 11
- 238000005452 bending Methods 0.000 claims description 10
- 238000002955 isolation Methods 0.000 claims description 9
- 238000004073 vulcanization Methods 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 7
- 238000001228 spectrum Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 238000012795 verification Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 3
- 239000003431 cross linking reagent Substances 0.000 claims description 3
- 238000007405 data analysis Methods 0.000 claims description 3
- 238000005457 optimization Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000005057 refrigeration Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0027—Pulsation and noise damping means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/3223—Cooling devices using compression characterised by the arrangement or type of the compressor
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- Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)
Abstract
The invention relates to the technical field of new energy automobiles, and discloses a noise control method for an electric compressor of a new energy automobile, which comprises the following steps: the method comprises the following steps: the vibration transmitted to the suspension active bracket by the compressor is reduced, and the noise of the compressor is mainly structural noise caused by the vibration of the compressor and air noise partially radiated into a vehicle through air, so that the vibration transmitted to a vehicle body by the compressor is preferably reduced. According to the invention, the vibration transmitted to the electric driving body by the compressor is reduced through the connection form of the rubber pad, the rear suspension driving support is connected with the electric driving body through the bolt, the vibration of the electric driving body is reduced, the vibration of the suspension driving support is reduced, the vibration transmitted to a vehicle body is synchronously reduced, and the structure noise in the vehicle is generated by the vibration excitation of the vehicle body, so that the noise of the compressor can be optimized.
Description
Technical Field
The invention relates to the technical field of new energy automobiles, in particular to a noise control method for an electric compressor of a new energy automobile.
Background
The new energy automobile adopts unconventional automobile fuel as a power source (or adopts conventional automobile fuel and a novel vehicle-mounted power device), integrates advanced technologies in the aspects of power control and driving of the automobile, and forms an automobile with advanced technical principle, new technology and new structure.
At present, the problem of large noise of an electric compressor commonly exists in the research and development stage of a new energy automobile, and main influence factors comprise the noise vibration level of the electric compressor, the arrangement and installation form of the electric compressor, the trend of a high-pressure exhaust pipe of the electric compressor, the rigidity of an installation bush of a condenser and the like.
The problem of noise of the compressor generally occurs when a fixed air conditioner of a vehicle is started for refrigeration, and is mainly indicated as that the noise in the vehicle is large, and the obvious buzz in the vehicle makes a client feel uncomfortable
Disclosure of Invention
The invention aims to provide a noise control method for an electric compressor of a new energy automobile, which solves the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a noise control method for an electric compressor of a new energy automobile comprises the following steps:
the method comprises the following steps: reducing vibration transmitted by compressor to suspended active support
The noise of the compressor is mainly structural noise caused by vibration of the compressor and air noise partially radiated into the vehicle through air, so that the vibration transmitted to the vehicle body by the compressor is preferably reduced, and the vibration path transmitted to the vehicle body by the compressor is as follows based on the arrangement form of the compressor on the motor in the project:
compressor-motor-electric drive suspension active support-motor suspension passive support-auxiliary frame-vehicle body
The vibration acceleration of the electrically driven rear suspension active support can be used as a reference. Through verification on a whole vehicle, under the working condition that the compressor normally works at a rotating speed (about 3000 rpm), when the vibration acceleration of the rear suspension driving support is more than or equal to 5m/s ^2, the noise influence on the compressor in the vehicle is larger, and when the vibration acceleration of the suspension driving support is reduced to be less than or equal to 3m/s ^2, the noise improvement of the compressor in the vehicle is found to be obvious, and the vibration acceleration of the electrically-driven suspension driving support is reduced mainly by changing the hard connection mode for fixing the compressor in an electrically-driven mode into a soft connection mode;
the vibration acceleration of the suspension active bracket after the electric drive is determined to be less than =3m/s ^2 under the working condition that the compressor usually works at the rotating speed (about 3000 rpm), and the vibration acceleration transmitted to each suspension active bracket by the compressor body is reduced by changing the connection form of the compressor and the electric drive and changing the hard connection form of a bolt into the soft connection form of a middle rubber pad. The compressor has larger vibration when working, the connection form of the rubber pad is added, so that the vibration transmitted to the electric driving body by the compressor is reduced, the rear suspension driving support is connected with the electric driving body through the bolt, the vibration of the electric driving body is reduced, the vibration of the suspension driving support is reduced, the vibration transmitted to a vehicle body is synchronously reduced, and the structure noise in the vehicle is generated by the vibration excitation of the vehicle body, so that the noise of the compressor can be optimized;
step two: optimizing the orientation of a high pressure discharge pipe of an electric compressor
In the project, due to the limitation of arrangement space, the trend of the compressor exhaust pipe is limited by the spatial arrangement, so that the high-pressure exhaust pipe is bent too much, the pulsation vibration of the exhaust pipe is large, and the noise of the compressor is influenced. In the whole vehicle verification process, the trend of the exhaust pipe is optimized, the bending of the exhaust pipe is reduced, and the length of a hard pipe of the exhaust pipe is reduced, wherein the hard pipe is usually an aluminum pipe, so that the noise of a compressor is reduced;
the bending of a high-pressure exhaust pipe of the electric compressor is reduced to reduce the noise of the compressor, the exhaust pipe is bent too much, so that the pulsation of high-pressure air in the exhaust pipe is increased, the vibration of a compressor body is increased due to the increase of the pulsation, the structural noise transmitted into a vehicle by the compressor is increased, meanwhile, the pulsation noise is radiated into the vehicle after being radiated to the air, the pulsation of the exhaust pipe is reduced by optimizing the traveling direction of the exhaust pipe in data design, so that the noise of the compressor is reduced, and meanwhile, the pulsation of the exhaust pipe can also be reduced by reducing the length of a hard pipe of the exhaust pipe;
step three: adjusting mounting bushing stiffness of condenser module
Generally, when a compressor starts refrigeration, a cooling fan is started to work, the cooling fan transmits vibration to a vehicle body, the whole vehicle verifies that when the vibration transmitted to the vehicle body by the cooling fan is reduced, the noise of the compressor is optimized, the vibration transmitted to the vehicle body by the cooling fan is reduced mainly by adjusting the rigidity of a bushing, which is formed by installing a condenser module on the vehicle body, and the cooling fan and the condenser are integrally assembled into a module whole;
the principle of the method is that sulfur plays a role of a cross-linking agent in rubber, the rubber has a high-molecular chain structure which is changed into a net structure, the cross-linking degree is increased along with the increase of the sulfur amount, the hardness of the rubber is increased, excessive sulfur is generated after the sulfur is added into a certain amount, and for any rubber, not only cross-linking is generated during vulcanization, but also a generation chain and molecular chain fracture are generated due to the action of heat and other factors, and the phenomenon runs through the whole vulcanization process. In the over-vulcanization stage, if the cross-linking is still dominant, the rubber becomes hard, the stretching strength continues to increase, otherwise, the rubber becomes soft, i.e. reversion occurs, the bushing of the condenser module is adjusted to mainly reduce the vibration transmitted to the vehicle body when the condenser module works, and when the vibration of the vehicle body is reduced, the noise in the vehicle is correspondingly reduced.
In a preferred embodiment of the present invention, in the first step, the vibration isolation rate of each suspension driven by electricity is 20dB or nearly 20dB, and the vibration isolation rate of the bushing connecting the subframe and the vehicle body is 10dB.
As a preferred embodiment of the present invention, in the first step, the three-way acceleration sensor collects a vibration acceleration signal of the electrically-driven rear suspension active bracket during the test, the test collection system converts the vibration and noise signal into an electrical signal, the electrical signal is converted into a frequency spectrum required by analysis through the data analysis system, and it is determined whether the vibration value of the rear suspension active bracket meets the requirement through the frequency spectrum.
As a preferred embodiment of the present invention, the rigidity requirement of the 3 directions of the vehicle body side of the installation point of the condenser module in the third step is usually > =1000N/mm, and when the rigidity of the bushing in the three directions < =50N/mm, a good vibration isolation capability can be obtained.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the vibration transmitted to the electric driving body by the compressor is reduced through the connection form of the rubber pad, the rear suspension driving support is connected with the electric driving body through the bolt, the vibration of the electric driving body is reduced, the vibration of the suspension driving support is reduced, the vibration transmitted to a vehicle body is synchronously reduced, and the structure noise in the vehicle is generated by the vibration excitation of the vehicle body, so that the noise of the compressor can be optimized.
2. The invention reduces the pulsation of the exhaust pipe by optimizing the routing of the exhaust pipe in data design, thereby reducing the noise of the compressor, and simultaneously reducing the length of the hard pipe of the exhaust pipe and also reducing the pulsation of the exhaust pipe.
3. The invention reduces the vibration transmitted to the vehicle body by the cooling fan by adjusting the rigidity of the bushing for installing the condenser module on the vehicle body, wherein the cooling fan and the condenser are integrally assembled into a module.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic flow chart of a noise control method for an electric compressor of a new energy automobile according to the present invention;
FIG. 2 is a schematic view of an assembly state of an optimized front electric drive assembly, a compressor bracket and a compressor of the noise control method of the electric compressor of the new energy automobile;
FIG. 3 is a schematic view of an assembly state of an optimized front electric drive assembly and a compressor bracket of the noise control method of the electric compressor of the new energy automobile;
FIG. 4 is a partial sectional view of a compressor bracket fixing point 1 before optimization of the noise control method of the electric compressor of the new energy automobile;
fig. 5 is a detailed sectional view of a compressor bracket fixing point 1 before optimization in the noise control method for the electric compressor of the new energy automobile according to the present invention;
FIG. 6 is an assembly state diagram of an optimized electric drive assembly, a compressor bracket and a compressor of the noise control method of the electric compressor of the new energy automobile;
FIG. 7 is an assembly state diagram of an optimized electric drive assembly and a compressor bracket of the noise control method of the electric compressor of the new energy automobile;
fig. 8 is a partial sectional view of a compressor bracket fixing point 1 after optimization of the noise control method for the electric compressor of the new energy automobile;
fig. 9 is a detailed sectional view of the optimized compressor bracket fixing point 1 in the noise control method for the electric compressor of the new energy automobile according to the present invention;
FIG. 10 is a state diagram of a compressor assembly and an exhaust pipe before optimization according to the noise control method for the electric compressor of the new energy vehicle;
FIG. 11 is a state diagram of an optimized compressor assembly and exhaust pipe according to the noise control method for the electric compressor of the new energy vehicle;
FIG. 12 is a graph of the state of the exhaust hard pipe of the compressor and the linear length before optimization according to the noise control method for the electric compressor of the new energy automobile;
FIG. 13 is a graph showing the state of the rear and front compressor exhaust hard pipes and the linear length of the electric compressor noise control method of the new energy vehicle according to the present invention;
FIG. 14 is a position state diagram of a condenser module assembly of the noise control method for the electric compressor of the new energy vehicle according to the present invention;
fig. 15 is a schematic view of an installation point of a condenser module assembly in the noise control method for the electric compressor of the new energy automobile according to the present invention;
fig. 16 is a detailed view of a condenser module assembly mounting point 1 of the noise control method of the electric compressor of the new energy automobile according to the invention;
fig. 17 is a detailed view of a condenser module assembly mounting point 3 of the noise control method for the electric compressor of the new energy automobile according to the present invention;
fig. 18 is a position state diagram of a cooling fan in a condenser module assembly according to the noise control method for the electric compressor of the new energy vehicle;
fig. 19 is a graph of noise data in the vehicle before and after optimization of a fixed point of a compressor bracket according to the noise control method for the electric compressor of the new energy automobile;
FIG. 20 is a data diagram of noise in the vehicle after optimization of a compressor bracket fixing point, a rubber pad and an exhaust pipe hard tube according to the noise control method for the electric compressor of the new energy vehicle;
fig. 21 is a diagram of noise data in a vehicle after the rigidity of the compressor bracket fixing point, the rubber pad, the exhaust pipe hard tube and the condenser module mounting point bushing are optimized according to the noise control method for the electric compressor of the new energy vehicle.
Detailed Description
Referring to fig. 1-21, the present invention provides a technical solution: a noise control method for an electric compressor of a new energy automobile comprises the following steps:
the method comprises the following steps: reducing vibration transmitted from compressor to suspended active support
The noise of the compressor is mainly structural noise caused by vibration of the compressor and air noise partially radiated into the vehicle through air, so that the priority is given to reducing the vibration transmitted to the vehicle body by the compressor, and the vibration path transmitted to the vehicle body by the compressor is as follows based on the arrangement form of the compressor on the motor in the project:
compressor-motor-electric drive suspension active support-motor suspension passive support-auxiliary frame-vehicle body
The vibration acceleration of the electrically driven rear suspension active support can be used as a reference. Through verification on a whole vehicle, under the working condition that the compressor normally works at a rotating speed (about 3000 rpm), when the vibration acceleration of the rear suspension driving support is more than or equal to 5m/s ^2, the noise influence on the compressor in the vehicle is larger, and when the vibration acceleration of the suspension driving support is reduced to be less than or equal to 3m/s ^2, the noise improvement of the compressor in the vehicle is found to be obvious, and the vibration acceleration of the electrically-driven suspension driving support is reduced mainly by changing the hard connection mode for fixing the compressor in an electrically-driven mode into a soft connection mode;
the vibration acceleration of the suspension active bracket after the electric drive is determined to be less than =3m/s ^2 under the working condition that the compressor usually works at the rotating speed (about 3000 rpm), and the vibration acceleration transmitted to each suspension active bracket by the compressor body is reduced by changing the connection form of the compressor and the electric drive and changing the hard connection form of a bolt into the soft connection form of a middle rubber pad. The compressor has larger vibration when working, the connection form of the rubber pad is added, so that the vibration transmitted to the electric driving body by the compressor is reduced, the rear suspension driving support is connected with the electric driving body through the bolt, the vibration of the electric driving body is reduced, the vibration of the suspension driving support is reduced, the vibration transmitted to a vehicle body is synchronously reduced, and the structure noise in the vehicle is generated by the vibration excitation of the vehicle body, so that the noise of the compressor can be optimized;
step two: optimizing the orientation of the high pressure discharge pipe of an electric compressor
In the project, due to the limitation of arrangement space, the trend of the exhaust pipe of the compressor is limited by the spatial arrangement, so that the high-pressure exhaust pipe is bent too much, the pulsation vibration of the exhaust pipe is large, and the noise of the compressor is influenced. In the whole vehicle verification process, the trend of the exhaust pipe is optimized, the bending of the exhaust pipe is reduced, and the length of a hard pipe of the exhaust pipe is reduced, wherein the hard pipe is usually an aluminum pipe, so that the noise of a compressor is reduced;
the bending of a high-pressure exhaust pipe of the electric compressor is reduced to reduce the noise of the compressor, the exhaust pipe is bent too much, so that the pulsation of high-pressure air in the exhaust pipe is increased, the vibration of a compressor body is increased due to the increase of the pulsation, the structural noise transmitted into a vehicle by the compressor is increased, and meanwhile, the pulsation noise can be radiated into the vehicle after being radiated to the air;
step three: adjusting mounting bushing stiffness of condenser module
Generally, when a compressor starts refrigeration, a cooling fan is started to work, the cooling fan transmits vibration to a vehicle body, the whole vehicle verifies that when the vibration transmitted to the vehicle body by the cooling fan is reduced, the noise of the compressor is optimized, the vibration transmitted to the vehicle body by the cooling fan is reduced mainly by adjusting the rigidity of a bushing, which is formed by installing a condenser module on the vehicle body, and the cooling fan and the condenser are integrally assembled into a module whole;
the principle of the method is that sulfur plays a role of a cross-linking agent in rubber, the rubber has a high-molecular chain structure which is changed into a net structure, the cross-linking degree is increased along with the increase of the sulfur amount, the hardness of the rubber is increased, excessive sulfur is generated after the sulfur is added into a certain amount, and for any rubber, not only cross-linking is generated during vulcanization, but also a generation chain and molecular chain fracture are generated due to the action of heat and other factors, and the phenomenon runs through the whole vulcanization process. In the over-vulcanization stage, if the cross-linking is still dominant, the rubber becomes hard, the stretching strength continues to increase, otherwise, the rubber becomes soft, i.e., the rubber is restored, the lining of the condenser module is adjusted mainly to reduce the vibration transmitted to the vehicle body when the condenser module works, and when the vibration of the vehicle body is reduced, the noise in the vehicle is correspondingly reduced.
In the technical scheme, in the step one, the vibration isolation rate of each suspension driven by the electric motor is equal to or close to 20dB, and the vibration isolation rate of a bushing of the subframe connected with the vehicle body is equal to or larger than 10dB.
In the technical scheme, during the test in the step one, the three-way acceleration sensor collects a vibration acceleration signal of the electrically-driven rear suspension driving support, the test collection system converts the vibration and noise signal into an electric signal, the electric signal is converted into a frequency spectrum required by analysis through the data analysis system, and whether the vibration value of the rear suspension driving support meets the requirement or not is confirmed through the frequency spectrum.
In the technical scheme, the rigidity requirement of 3 directions on the vehicle body side of the installation point of the condenser module in the third step is usually > =1000N/mm, and when the rigidity of the three directions of the bushing is < =50N/mm, better vibration isolation capability can be obtained.
Example one
The first scheme comprises the following steps: the fixed point of the compressor bracket is flexibly connected with a rubber pad;
front and rear in-vehicle noise state optimized by meter-compressor support fixed point
Example two
Scheme two is as follows: reducing bending and length of exhaust pipe hard pipe
Noise state in car before and after the second exhaust pipe hard tube optimization
EXAMPLE III
And the rigidity of the bushing at the mounting point of the three-surface condenser module assembly is optimized in the front-back state.
Example four
The first scheme is as follows: the fixed point of the compressor bracket is flexibly connected with a rubber pad; scheme II: the bending and the length of the exhaust pipe hard pipe are reduced; and (4) optimizing the rigidity of the bushing at the mounting point of the condenser module assembly in the third scheme.
Noise state in vehicle before and after optimization of rigidity of mounting point bushing of four condenser module assembly
When the noise control method for the electric compressor of the new energy automobile is used, the vibration acceleration of the suspension driving support after electric driving can be used as a reference. The noise of the compressor during working is reduced by mainly changing the hard connection mode of fixing the compressor in electric driving into a soft connection mode, reducing the bending of a high-pressure exhaust pipe of an electric compressor to reduce the noise of the compressor, bending the exhaust pipe too much to increase the pulsation of high-pressure air in the exhaust pipe, increasing the vibration of a compressor body due to the pulsation, increasing the structural noise of the compressor during transmission into the vehicle, radiating the pulsation noise into the vehicle after radiating the pulsation noise into the air, reducing the pulsation of the exhaust pipe by optimizing the exhaust pipe in data design to reduce the pulsation of the exhaust pipe so as to reduce the noise of the compressor, reducing the length of the hard pipe of the exhaust pipe so as to reduce the pulsation of the exhaust pipe, reducing the noise of the compressor during working by adjusting the rigidity of an installation bush of a condenser module, adjusting the consumption of the bush to optimize the pulsation of the exhaust pipe by adjusting the rigidity of the bush, changing the consumption of the vulcanizing agent into a crosslinking rubber and increasing the consumption of the crosslinking rubber in the vulcanization principle. In the over-vulcanization stage, if the cross-linking is still dominant, the rubber is hardened, the stretching strength continues to increase, otherwise, the rubber is softened, and the rubber is restored, the bushing of the condenser module is adjusted to mainly reduce the vibration transmitted to the vehicle body when the condenser module works, when the vibration of the vehicle body is reduced, the noise in the vehicle is correspondingly reduced, all the parts of the invention are universal standard parts or parts known by the technical personnel in the field, and the structure and the principle of the parts can be known by the technical manual or the conventional experimental method.
Claims (4)
1. A noise control method for an electric compressor of a new energy automobile is characterized by comprising the following steps:
the method comprises the following steps: reducing vibration transmitted by compressor to suspended active support
The noise of the compressor is mainly structural noise caused by vibration of the compressor and air noise partially radiated into the vehicle through air, so that the vibration transmitted to the vehicle body by the compressor is preferably reduced, and the vibration path transmitted to the vehicle body by the compressor is as follows based on the arrangement form of the compressor on the motor in the project:
compressor-motor-electric drive suspension active support-motor suspension passive support-auxiliary frame-vehicle body
The vibration acceleration of the electrically driven rear suspension active support can be used as a reference. Through verification on a whole vehicle, under the working condition that the compressor normally works at a rotating speed (about 3000 rpm), when the vibration acceleration of the rear suspension driving support is more than or equal to 5m/s ^2, the noise influence on the compressor in the vehicle is larger, and when the vibration acceleration of the suspension driving support is reduced to be less than or equal to 3m/s ^2, the noise improvement of the compressor in the vehicle is found to be obvious, and the vibration acceleration of the electrically-driven suspension driving support is reduced mainly by changing the hard connection mode for fixing the compressor in an electrically-driven mode into a soft connection mode;
the vibration acceleration of the suspension active bracket after the electric drive is determined to be less than =3m/s ^2 under the working condition that the compressor usually works at the rotating speed (about 3000 rpm), and the vibration acceleration transmitted to each suspension active bracket by the compressor body is reduced by changing the connection form of the compressor and the electric drive and changing the hard connection form of a bolt into the soft connection form of a middle rubber pad. The compressor has larger vibration when working, the connection form of the rubber pad reduces the vibration transmitted to the electric drive body by the compressor, the rear suspension driving bracket is connected with the electric drive body through the bolt, the vibration of the electric drive body is reduced, the vibration of the suspension driving bracket is reduced, the vibration transmitted to a vehicle body is synchronously reduced, and the structure noise in the vehicle is generated by the vibration excitation of the vehicle body, so the noise of the compressor can be optimized;
step two: optimizing the orientation of the high pressure discharge pipe of an electric compressor
In the project, due to the limitation of arrangement space, the trend of the compressor exhaust pipe is limited by the spatial arrangement, so that the high-pressure exhaust pipe is bent too much, the pulsation vibration of the exhaust pipe is large, and the noise of the compressor is influenced. In the whole vehicle verification process, the trend of the exhaust pipe is optimized, the bending of the exhaust pipe is reduced, and the length of a hard pipe of the exhaust pipe is reduced, wherein the hard pipe is usually an aluminum pipe, so that the noise of a compressor is reduced;
the bending of a high-pressure exhaust pipe of the electric compressor is reduced to reduce the noise of the compressor, the exhaust pipe is bent too much, so that the pulsation of high-pressure air in the exhaust pipe is increased, the vibration of a compressor body is increased due to the increase of the pulsation, the structural noise transmitted into a vehicle by the compressor is increased, meanwhile, the pulsation noise is radiated into the vehicle after being radiated to the air, the pulsation of the exhaust pipe is reduced by optimizing the traveling direction of the exhaust pipe in data design, so that the noise of the compressor is reduced, and meanwhile, the pulsation of the exhaust pipe can also be reduced by reducing the length of a hard pipe of the exhaust pipe;
step three: adjusting mounting bushing stiffness of condenser module
Generally, when a compressor starts to refrigerate, a cooling fan starts to work, the cooling fan transmits vibration to a vehicle body, the whole vehicle verifies that when the vibration transmitted to the vehicle body by the cooling fan is reduced, the noise of the compressor is optimized, the vibration transmitted to the vehicle body by the cooling fan is reduced mainly by adjusting the rigidity of a bushing, which is formed by mounting a condenser module on the vehicle body, of the cooling fan, wherein the cooling fan and the condenser are integrally assembled into a module whole;
the principle of the method is that sulfur plays a role of a cross-linking agent in rubber, the rubber has a high-molecular chain structure which is changed into a net structure, the cross-linking degree is increased along with the increase of the sulfur amount, the hardness of the rubber is increased, and the sulfur is added into a certain amount to generate over-sulfur. In the over-vulcanization stage, if the cross-linking is still dominant, the rubber becomes hard, the stretching strength continues to increase, otherwise, the rubber becomes soft, i.e. reversion occurs, the bushing of the condenser module is adjusted to mainly reduce the vibration transmitted to the vehicle body when the condenser module works, and when the vibration of the vehicle body is reduced, the noise in the vehicle is correspondingly reduced.
2. The noise control method for the electric compressor of the new energy automobile according to claim 1, characterized in that: in the first step, the vibration isolation rate of each suspension driven by the electric drive is equal to or close to 20dB, and the vibration isolation rate of a bushing connected with the vehicle body by the auxiliary frame is equal to or greater than 10dB.
3. The noise control method of the electric compressor of the new energy automobile is characterized in that: the three-way acceleration sensor collects vibration acceleration signals of the electrically-driven rear suspension driving support during testing in the first step, the test collection system converts the vibration and noise signals into electric signals, the electric signals are converted into frequency spectrums required by analysis through the data analysis system, and whether the vibration value of the rear suspension driving support meets the requirements or not is confirmed through the frequency spectrums.
4. The noise control method for the electric compressor of the new energy automobile according to claim 1, characterized in that: in the third step, the rigidity requirement of 3 directions of the vehicle body side of the installation point of the condenser module is usually > =1000N/mm, and when the rigidity of the bushing in the three directions is < =50N/mm, better vibration isolation capability can be obtained.
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