CN110633477A - Vehicle and method and device for calculating pressure of passenger compartment of vehicle - Google Patents
Vehicle and method and device for calculating pressure of passenger compartment of vehicle Download PDFInfo
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- CN110633477A CN110633477A CN201810650347.9A CN201810650347A CN110633477A CN 110633477 A CN110633477 A CN 110633477A CN 201810650347 A CN201810650347 A CN 201810650347A CN 110633477 A CN110633477 A CN 110633477A
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Abstract
The invention provides a vehicle and a method and a device for calculating the pressure of a passenger compartment of the vehicle, wherein the vehicle is provided with a buffer compartment, the buffer compartment is a cavity formed between an interior trim panel and a metal plate of a vehicle body, the interior trim panel is provided with an interior trim panel hole communicated with the passenger compartment, and an air conditioner of the vehicle runs in an external circulation mode, and the method comprises the following steps: acquiring the density of ambient air outside the vehicle; acquiring the average speed of airflow at the hole section of the inner decorative plate and the pressure of the buffer cabin; and calculating the pressure of the passenger cabin according to the average speed of the airflow at the cross section of the inner decorative plate hole, the pressure of the buffer cabin and the density of the ambient air outside the vehicle, so that the efficiency of calculating the pressure of the passenger cabin can be effectively improved, the calculation of the pressure of the passenger cabin can be realized without high-performance calculation equipment, and the cost is saved.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a vehicle and a method and a device for calculating pressure of a passenger compartment of the vehicle.
Background
Vehicle passenger compartment pressure affects the comfort of the passengers within the passenger compartment, as well as the amount of force required to close the door. Especially in the mode of starting the external circulation of the vehicle air conditioner, the pressure in the passenger compartment of the automobile is greater than the ambient pressure. If the passenger compartment pressure is too high, the comfort of the passengers in the passenger compartment is reduced, and the force for closing the door is also increased. Therefore, the passenger compartment pressure of the automobile needs to be calculated.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, a first object of the present invention is to propose a method for calculating a vehicle passenger compartment pressure, so as to achieve an efficient and simple calculation of the vehicle passenger compartment pressure.
A second object of the invention is to propose a device for calculating the pressure in the passenger compartment of a vehicle.
A third object of the invention is to propose a vehicle.
A fourth object of the invention is to propose a non-transitory computer-readable storage medium.
In order to achieve the above object, a method for calculating a pressure in a passenger compartment of a vehicle according to an embodiment of a first aspect of the present invention is provided, where the vehicle is provided with a buffer compartment, the buffer compartment is a cavity formed between an interior panel of the vehicle and a sheet metal of a vehicle body, the interior panel is provided with an interior panel hole communicated with the passenger compartment, and an air conditioner of the vehicle operates in an external circulation mode, and the method includes the following steps: acquiring the density of ambient air outside the vehicle; acquiring the average speed of airflow at the hole section of the inner decorative plate and the pressure of the buffer cabin; and calculating the pressure of the passenger compartment according to the average speed of the airflow at the cross section of the inner decorative plate hole, the pressure of the buffer compartment and the density of the ambient air outside the vehicle.
According to the method for calculating the pressure of the passenger compartment of the vehicle, when the air conditioner of the vehicle is in the external circulation mode, the average speed of the airflow at the hole section of the inner decorative plate, the pressure of the buffer compartment and the density of the ambient air outside the vehicle are obtained, and then the pressure of the passenger compartment is calculated. Therefore, the calculation method provided by the embodiment of the invention is simple and rapid, can effectively improve the efficiency of calculating the pressure of the passenger compartment, can realize the calculation of the pressure of the passenger compartment without high-performance calculation equipment, and saves the cost.
According to one embodiment of the invention, the car body metal plate is provided with a pressure relief hole communicated with ambient air outside the car to obtain the pressure of the buffer cabin, and the pressure relief hole comprises the following steps: acquiring the pressure of ambient air outside the vehicle; acquiring the average speed of the air flow of the pressure relief hole; and calculating the pressure of the buffer cabin according to the pressure of the ambient air outside the vehicle and the average speed of the air flow of the pressure relief hole.
According to one embodiment of the invention, acquiring the average speed of the airflow at the hole section of the inner decoration plate and/or acquiring the average speed of the airflow of the pressure relief hole comprises: acquiring the average speed of the airflow at the cross section of the inner decorative plate hole according to the mass flow and the speed coefficient of the ambient air outside the vehicle and the cross section area of the inner decorative plate hole; and/or obtaining the average speed of the air flow at the cross section of the pressure relief hole according to the mass flow and the speed coefficient of the ambient air outside the vehicle and the cross section of the pressure relief hole.
According to an embodiment of the invention, the method for calculating the pressure in the passenger compartment of the vehicle further comprises: acquiring the normal average speed of the airflow of the inner decorative plate hole according to the mass flow of the ambient air outside the vehicle and the sectional area of the inner decorative plate hole, and acquiring the average speed of the airflow at the section of the inner decorative plate hole according to the normal average speed of the airflow of the inner decorative plate hole and the speed coefficient; and/or acquiring the normal average speed of the air flow of the pressure relief hole according to the mass flow of the air in the environment outside the vehicle and the sectional area of the pressure relief hole, and acquiring the average speed of the air flow of the pressure relief hole according to the normal average speed of the air flow of the pressure relief hole and the speed coefficient.
According to an embodiment of the invention, the method for calculating the pressure in the passenger compartment of the vehicle further comprises: and receiving detection data sent by a vehicle air conditioner, wherein the detection data carries the mass flow of the external ambient air.
According to one embodiment of the invention, the pressure of the passenger compartment is calculated according to the average speed of the airflow at the cross section of the inner decorative plate hole, the pressure of the buffer compartment and the density of the ambient air outside the vehicle, and is expressed by the following formula:
wherein, P2Is the pressure of the passenger compartment, P1Is the pressure of the buffer cabin, rho is the density of the ambient air outside the vehicle, V2The average speed of the airflow at the hole section of the inner decorative plate is shown.
In order to achieve the above object, according to a second aspect of the present invention, there is provided a device for calculating a passenger compartment pressure of a vehicle, the vehicle being provided with a buffer compartment, the buffer compartment being a cavity formed between an interior panel of the vehicle and a sheet metal of a vehicle body, the interior panel being provided with an interior panel hole communicating with the passenger compartment, and an air conditioner of the vehicle being operated in an external circulation mode, the device comprising: the first acquisition device is used for acquiring the density of the ambient air outside the vehicle; the second acquisition device is used for acquiring the average speed of the airflow at the hole section of the inner decorative plate and the pressure of the buffer cabin; and the calculation module is used for calculating the pressure of the passenger compartment according to the average speed of the airflow at the cross section of the inner decorative plate hole, the pressure of the buffer compartment and the density of the ambient air outside the vehicle.
According to the vehicle passenger compartment pressure calculating device provided by the embodiment of the invention, when the vehicle air conditioner is in the external circulation mode, the first acquiring device is used for acquiring the average speed of airflow at the cross section of the inner decorative plate hole and the pressure of the buffer compartment, the second acquiring device is used for acquiring the density of ambient air outside the vehicle, and the calculating module is used for calculating the pressure of the passenger compartment. Therefore, the calculating device provided by the embodiment of the invention can effectively improve the efficiency of calculating the pressure of the passenger compartment, can realize the calculation of the pressure of the passenger compartment without high-performance calculating equipment, and saves the cost.
According to one embodiment of the invention, the computing device further comprises a buffer chamber pressure sensor: the buffer cabin pressure sensor is used for detecting the pressure of the buffer cabin.
In order to achieve the above object, the present invention further provides a vehicle including the vehicle passenger compartment pressure calculation device.
To achieve the above object, the present invention also proposes a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method of calculating a vehicle passenger compartment pressure.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of a method of calculating vehicle passenger compartment pressure according to an embodiment of the invention;
FIG. 2 is a block schematic diagram of a vehicle passenger compartment pressure calculation device according to an embodiment of the invention;
FIG. 3 is a block schematic diagram of a vehicle according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
It should be noted that, in the related art, in order to calculate the vehicle passenger compartment pressure when the air conditioner is in the open external circulation mode, commercial CFU simulation software such as STAR-CCM +, FLUENT and the like is generally used to calculate the pressure through the detection modeling. The specific steps are as follows: firstly, establishing computational domain surface meshes including an air conditioner, an air duct, a grid, a seat, an instrument panel, an interior trim part and the like on the basis of a three-dimensional geometric model through mesh division software, adjusting the computational domain surface meshes to proper quality, then guiding the surface meshes into CFD software to generate body meshes, setting relevant parameters, and then calculating and analyzing to obtain the pressure of a passenger compartment.
However, the whole pressure calculation process in the above related art includes processes of geometric surface extraction, surface mesh establishment, volume mesh generation, calculation solution, analysis processing, and the like. Particularly, in the process of building a face grid, all fluid domain geometric boundaries need to be extracted, a large number of geometric faces are divided into face grids, and the face grids are adjusted to be of proper quality, the work accounts for about 75% of the whole work load, so that the whole pressure calculation work load is quite huge, the work cycle is long for completing the pressure calculation, the time of about half a month is needed for completing the whole work cycle, even if the process of building the face grids is ignored, at least two days are needed for calculation and analysis, the work cycle is seriously delayed, the cost is increased, and in order to complete the contents of the calculation and analysis, a high-performance computer is needed for calculation and analysis, and CFD commercial software needs to be purchased.
Based on this, the application proposes a method for calculating the pressure in the passenger compartment of a vehicle.
A method of calculating a vehicle passenger compartment pressure and a device for calculating a vehicle passenger compartment pressure according to an embodiment of the present invention are described below with reference to the drawings.
FIG. 1 is a flow chart of a method of calculating vehicle passenger compartment pressure implemented in accordance with the present invention. Wherein the air conditioner of the vehicle is operated in an external circulation mode.
As shown in fig. 1, the method for calculating the pressure in the passenger compartment of the vehicle according to the embodiment of the present invention includes the following steps:
s1: and acquiring the density of the ambient air outside the vehicle.
S2: and acquiring the average speed of the airflow at the hole section of the inner decorative plate and the pressure of the buffer cabin.
S3: and calculating the pressure of the passenger compartment according to the average speed of the airflow at the cross section of the hole of the inner decorative plate, the pressure of the buffer compartment and the density of the ambient air outside the vehicle.
The vehicle is provided with a buffer cabin, the buffer cabin is a cavity formed between an interior trim panel of the vehicle and a vehicle body metal plate, the interior trim panel is provided with an interior trim panel hole communicated with the passenger cabin, and the vehicle body metal plate is provided with a pressure relief hole communicated with ambient air outside the vehicle. Generally, under the mode that an automobile air conditioner is started to circulate outside, outside airflow firstly enters each air duct through an air conditioning box, then enters a passenger cabin, then flows into a buffer cabin formed between an interior trim and an automobile body sheet metal through an interior trim hole, and finally is discharged into the environment outside the automobile through a pressure relief hole in the automobile body sheet metal. The air flow is exhausted from the passenger compartment to the environment outside the vehicle and needs to pass through the inner decorative plate hole and the pressure relief hole, namely twice throttling.
First, the density ρ of the ambient air outside the vehicle is acquired. The density ρ of the ambient air outside the vehicle is an air density, that is, ρ is 1.18415kg/m3. It should be understood that it may also be external to the harvesting vehicleThe density rho of the ambient air, and the pressure P of the ambient air outside the vehicle0. Wherein the pressure P of the ambient air outside the vehicle0The air pressure was 101325 Pa.
Based on this, the analysis is performed by aerodynamic principles according to the physical movement of the air flow: the pressure of the passenger compartment can be calculated by using a Bernoulli equation according to the average speed of the airflow at the hole section of the inner decorative plate, the pressure of the buffer compartment and the density of the ambient air outside the vehicle, and the specific formula is as follows:
wherein, P2For pressure in the passenger compartment, P1Is the pressure of the buffer tank, ρ is the density of the ambient air outside the vehicle, V2Is the average velocity of the air flow at the hole section of the inner decorative plate.
Further, in order to obtain the pressure P of the buffer chamber1Further calculations can be made according to bernoulli's equation:
wherein, P1To buffer the pressure of the chamber, P0Is the pressure of the ambient air outside the vehicle, ρ is the density of the ambient air outside the vehicle, V1Is the average velocity of the air flow at the cross section of the pressure relief hole.
Further, acquiring the average speed V of the airflow at the hole section of the inner decorative plate2And/or obtaining the average speed V of the air flow of the pressure relief hole1The method comprises the following steps: according to the mass flow Q of the ambient air outside the vehicle, the velocity coefficient alpha and the sectional area A of the inner decorative plate hole2Obtaining the average speed V of the airflow at the hole section of the inner decorative plate2(ii) a And/or according to the mass flow Q of the ambient air outside the vehicle, the velocity coefficient alpha and the sectional area A of the pressure relief hole1Obtaining the average speed V of the air flow at the cross section of the pressure relief hole1。
The method comprises the steps of receiving detection data sent by the vehicle air conditioner, wherein the detection data carries the mass flow Q of the external ambient air.
Specifically, according to the mass conservation law, the mass flow rate of air flowing through the pressure relief hole and the trim plate hole is equal to the mass flow rate Q of air entering the passenger compartment through the air conditioner. And because the air flow rate is low throughout the air flow process, the air can be treated as an incompressible fluid, and the air flow velocities at locations in the passenger and buffer compartments remote from the air flow inlet and outlet are negligible compared to the air flow velocities at the inlet and outlet cross-sections. Therefore, the mass flow rate Q of the ambient air outside the vehicle and the cross-sectional area A of the inner decorative plate hole can be adjusted2Obtaining the normal average speed V of the airflow of the holes of the inner decorative platet2I.e. Q ═ ρ Vt2A2Then according to the normal average speed V of the airflow at the holes of the inner decorative platet2And the velocity coefficient alpha is used for obtaining the average velocity V of the airflow at the hole section of the inner decorative plate2I.e. Vt2＝αV2。
Similarly, according to the mass flow Q of the ambient air outside the automobile and the sectional area A of the pressure relief hole1Obtaining the normal average speed V of the air flow of the pressure relief holet1I.e. Q ═ ρ Vt1A1Then according to the normal average speed V of the air flow of the pressure relief holet1The sum velocity coefficient alpha is used for obtaining the average velocity V of the air flow of the pressure relief hole1I.e. Vt1＝αV1。
The speed coefficient alpha is obtained by a large amount of calculation and induction by the inventor, and the value can be 0.8.
It should be noted that to further simplify the calculation process, the effect of either the trim holes or the pressure relief holes can be ignored, and when only the trim holes are considered, there is P1＝P0When only the pressure relief hole is considered, there is P2＝P1。
According to one embodiment of the invention, a buffer cabin pressure sensor can be arranged at the buffer cabin to detect the pressure of the buffer cabin, so that the pressure of the passenger cabin can be directly calculated according to the average speed of the airflow at the hole section of the inner decorative plate, the pressure of the buffer cabin and the density of the ambient air outside the vehicle.
The calculation method of the vehicle passenger compartment pressure proposed by the application is compared with the calculation result of the CFD commercial software adopted in the related art, and is shown in the table 1.
TABLE 1
In addition, in example 3, the influence of the holes of the inner panel was ignored.
Therefore, compared with the calculation method in the related art, the calculation method for the vehicle passenger compartment pressure provided by the application has the advantages that the error is smaller, the calculation amount is obviously smaller than that of the calculation method in the related art, high-performance calculation equipment is not needed, the calculation time is effectively reduced, the construction period is shortened, and the cost is saved.
In summary, according to the method for calculating the pressure of the passenger compartment of the vehicle in the embodiment of the invention, when the air conditioner of the vehicle is in the external circulation mode, the average speed of the airflow at the cross section of the hole of the inner decorative plate, the pressure of the buffer compartment and the density of the ambient air outside the vehicle are obtained, and then the pressure of the passenger compartment is calculated. Therefore, the calculation method provided by the embodiment of the invention is simple and rapid, can effectively improve the efficiency of calculating the pressure of the passenger compartment, can realize the calculation of the pressure of the passenger compartment without high-performance calculation equipment, and saves the cost.
FIG. 2 is a block diagram of an apparatus for calculating vehicle passenger compartment pressure in accordance with an embodiment of the present invention. Wherein the air conditioner of the vehicle is operated in an external circulation mode. As shown in fig. 2, the apparatus for calculating a vehicle passenger compartment pressure according to the embodiment of the present invention includes: a first acquisition device 10, a second acquisition device 20 and a calculation module 30.
Wherein, the first obtaining device 10 is used for obtaining the density of the ambient air outside the vehicle; the second acquiring device 20 is used for acquiring the average speed of the airflow at the hole section of the inner decorative plate and the pressure of the buffer cabin; the calculation module 30 is used for calculating the pressure of the passenger compartment according to the average speed of the airflow at the hole section of the inner decoration plate, the pressure of the buffer compartment and the density of the ambient air outside the vehicle.
The vehicle is provided with a buffer cabin, the buffer cabin is a cavity formed between a vehicle interior trim panel and a vehicle body metal plate, and an interior trim panel hole communicated with a passenger compartment is formed in the interior trim panel.
Further, the first acquiring device 10 is also used for acquiring the pressure of the ambient air outside the vehicle; the calculation module 30 is further configured to obtain an average speed of the pressure relief vent airflow, and calculate the pressure of the buffer cabin according to the pressure of the ambient air outside the vehicle and the average speed of the pressure relief vent airflow.
Further, the calculation module 30 is further configured to obtain an average speed of the airflow at the cross section of the inner panel hole according to the mass flow and the speed coefficient of the ambient air outside the vehicle and the cross section of the inner panel hole; and/or obtaining the average speed of the air flow at the cross section of the pressure relief hole according to the mass flow and the speed coefficient of the ambient air outside the vehicle and the cross section of the pressure relief hole.
Further, the calculation module 30 is further configured to obtain a normal average velocity of the airflow at the hole section of the interior panel according to the mass flow of the ambient air outside the vehicle and the cross-sectional area of the hole of the interior panel, and then obtain an average velocity of the airflow at the hole section of the interior panel according to the normal average velocity and the velocity coefficient of the airflow at the hole section of the interior panel; and/or obtaining the normal average speed of the air flow of the pressure relief hole according to the mass flow of the ambient air outside the vehicle and the sectional area of the pressure relief hole, and obtaining the average speed of the air flow of the pressure relief hole according to the normal average speed and the speed coefficient of the air flow of the pressure relief hole.
Further, the calculation module 30 is further configured to receive detection data sent by the vehicle air conditioner, where the detection data carries the mass flow of the external ambient air.
According to an embodiment of the invention, the calculation means of the vehicle passenger compartment pressure may further comprise a buffer compartment pressure sensor: the buffer cabin pressure sensor is used for detecting the pressure of the buffer cabin.
In summary, according to the vehicle passenger compartment pressure calculation apparatus provided by the embodiment of the invention, when the vehicle air conditioner is in the external circulation mode, the first obtaining device obtains the average speed of the airflow at the hole section of the inner decorative plate and the pressure of the buffer compartment, the second obtaining device obtains the density of the ambient air outside the vehicle, and the calculation module calculates the pressure of the passenger compartment. Therefore, the calculating device provided by the embodiment of the invention can effectively improve the efficiency of calculating the pressure of the passenger compartment, can realize the calculation of the pressure of the passenger compartment without high-performance calculating equipment, and saves the cost.
In order to achieve the above object, the present invention further provides a vehicle 200, as shown in fig. 3, including the aforementioned calculation apparatus 100 for vehicle passenger compartment pressure.
To achieve the above object, the present invention also proposes a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the aforementioned method of calculating a vehicle passenger compartment pressure.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A method for calculating the pressure of a passenger compartment of a vehicle is characterized in that the vehicle is provided with a buffer compartment, the buffer compartment is a cavity formed between an interior trim panel and a metal plate of a vehicle body, an interior trim panel hole communicated with the passenger compartment is formed in the interior trim panel, and an air conditioner of the vehicle runs in an external circulation mode, and the method comprises the following steps:
acquiring the density of ambient air outside the vehicle;
acquiring the average speed of airflow at the hole section of the inner decorative plate and the pressure of the buffer cabin;
and calculating the pressure of the passenger compartment according to the average speed of the airflow at the cross section of the inner decorative plate hole, the pressure of the buffer compartment and the density of the ambient air outside the vehicle.
2. The method for calculating the pressure of the passenger compartment of the vehicle according to claim 1, wherein a pressure relief hole communicated with the ambient air outside the vehicle is formed in the sheet metal of the vehicle body, and the step of obtaining the pressure of the buffer compartment comprises the following steps:
acquiring the pressure of ambient air outside the vehicle;
acquiring the average speed of the air flow of the pressure relief hole;
and calculating the pressure of the buffer cabin according to the pressure of the ambient air outside the vehicle and the average speed of the air flow of the pressure relief hole.
3. The method for calculating the vehicle passenger compartment pressure according to claim 2, wherein obtaining the average speed of the airflow at the cross section of the trim plate hole and/or obtaining the average speed of the airflow at the pressure relief hole comprises:
acquiring the average speed of the airflow at the cross section of the inner decorative plate hole according to the mass flow and the speed coefficient of the ambient air outside the vehicle and the cross section area of the inner decorative plate hole; and/or
And acquiring the average speed of the air flow at the section of the pressure relief hole according to the mass flow and the speed coefficient of the ambient air outside the vehicle and the sectional area of the pressure relief hole.
4. The method of calculating vehicle passenger compartment pressure according to claim 3, further comprising:
acquiring the normal average speed of the airflow of the inner decorative plate hole according to the mass flow of the ambient air outside the vehicle and the sectional area of the inner decorative plate hole, and acquiring the average speed of the airflow at the section of the inner decorative plate hole according to the normal average speed of the airflow of the inner decorative plate hole and the speed coefficient; and/or
And acquiring the normal average speed of the air flow of the pressure relief hole according to the mass flow of the ambient air outside the vehicle and the sectional area of the pressure relief hole, and acquiring the average speed of the air flow of the pressure relief hole according to the normal average speed of the air flow of the pressure relief hole and the speed coefficient.
5. The method of calculating vehicle passenger compartment pressure according to claim 4, further comprising:
and receiving detection data sent by a vehicle air conditioner, wherein the detection data carries the mass flow of the external ambient air.
6. The method for calculating the pressure of the passenger compartment of the vehicle according to claim 1, wherein the pressure of the passenger compartment is calculated according to the average speed of the airflow at the hole section of the inner panel, the pressure of the buffer compartment and the density of the ambient air outside the vehicle, and is expressed by the following formula:
wherein, P2Is the pressure of the passenger compartment, P1Is the pressure of the buffer cabin, rho is the density of the ambient air outside the vehicle, V2The average speed of the airflow at the hole section of the inner decorative plate is shown.
7. A device for calculating the pressure of a passenger compartment of a vehicle is characterized in that the vehicle is provided with a buffer compartment, the buffer compartment is a cavity formed between an interior trim panel and a metal plate of a vehicle body of the vehicle, an interior trim panel hole communicated with the passenger compartment is formed in the interior trim panel, and an air conditioner of the vehicle runs in an external circulation mode, and the device comprises:
the first acquisition device is used for acquiring the density of the ambient air outside the vehicle;
the second acquisition device is used for acquiring the average speed of the airflow at the hole section of the inner decorative plate and the pressure of the buffer cabin;
and the calculation module is used for calculating the pressure of the passenger compartment according to the average speed of the airflow at the cross section of the inner decorative plate hole, the pressure of the buffer compartment and the density of the ambient air outside the vehicle.
8. The vehicle passenger compartment pressure calculation apparatus of claim 7, further comprising a buffer compartment pressure sensor:
the buffer cabin pressure sensor is used for detecting the pressure of the buffer cabin.
9. A vehicle comprising a vehicle passenger compartment pressure calculation device according to any one of claims 7 and 8.
10. A non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the method of calculating a vehicle passenger compartment pressure according to any one of claims 1 to 6.
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