Train interior air conditioning method and system

Abstract

The invention discloses a method and a system for conditioning air in a train. The method comprises the following steps: S1, determining a reference air volume according to the total length of a tunnel currently passed by the train and the current altitude of the train; s2, the compensation air volume is determined according to the carbon dioxide concentration in the train; and S3, the total air volume of the fan is set as the sum of the reference air volume and the compensation air volume. Due to the adoption of the technical scheme, compared with the prior art, the three technical problems of plateau oxygen deficit, extra-long tunnel leakage and transient impact are solved, and the comprehensive benefits of energy conservation, cost reduction, comfort and safety are achieved.

Description

Technical Field

[0001] This invention relates to the field of rail transit technology, specifically to a method and system for regulating air inside a train. Background Technology

[0002] During train operation, as altitude increases, atmospheric pressure and oxygen concentration drop rapidly, often causing altitude sickness symptoms such as difficulty breathing and rapid heartbeat in passengers and drivers. In severe cases, this can threaten their lives. Effectively mitigating discomfort and altitude sickness among passengers on high-altitude trains has long been a focus of attention for many technical experts.

[0003] Currently, high-altitude trains (such as the Qinghai-Tibet Railway) have adopted a series of comprehensive measures to improve passenger comfort and reduce altitude sickness. These measures include distributing oxygen evenly throughout the carriages through air conditioning vents to alleviate discomfort caused by insufficient oxygen concentration, equipping passenger seats with independent oxygen inhalation devices, automatically regulating the temperature and humidity of the passenger compartments through the air conditioning system, and strengthening the airtightness design of the carriages to reduce discomfort caused by rapid increases or decreases in altitude due to changes in air pressure.

[0004] The above-mentioned technology has at least the following technical problems: 1. In high-altitude areas, the air density is low and the oxygen content is small. If the air supply is still based on the experience value in plains, there will be a hidden hypoxia in the car, where the air volume is sufficient but the oxygen equivalent is insufficient; 2. When the train is running in a long tunnel, a longitudinal flow of piston wind + train wind is formed outside the car. If the air supply inside the car is kept at a fixed frequency, there will be positive pressure overflow at the front of the car and negative pressure suction at the rear of the car, resulting in problems such as short circuit of fresh air and backflow of exhaust air. Summary of the Invention

[0005] This invention provides a method and system for regulating air inside a train to solve the technical problems of existing technologies that easily lead to latent hypoxia when the train is running in high-altitude sections, positive pressure overflow at the front section and negative pressure suction at the rear section when the train is running in long tunnels, as well as short circuit of fresh air and backflow of exhaust air.

[0006] To achieve the above objectives, the present invention adopts the following technical solution.

[0007] On the one hand, a method for air conditioning inside a train is provided, comprising the following steps:

[0008] S1. Determine the baseline air volume based on the total length of the tunnel the train is currently passing through and the train's current altitude;

[0009] S2. Determine the compensation air volume based on the carbon dioxide concentration inside the train;

[0010] S3. Set the total air volume of the fan to the sum of the base air volume and the compensation air volume;

[0011] The methods for determining the baseline air volume Vbase include:

[0012] when and hour, ;

[0013] when hour, ;

[0014] Other situations ;

[0015] Compensating air volume The methods for determining this include:

[0016] when hour, ;otherwise ;

[0017] The baseline air volume is determined once every first cycle, and the compensation air volume is determined once every second cycle, with the first cycle being longer than the second cycle.

[0018] In the formula, This is the total length of the tunnel the train is currently passing through. This is the train's current altitude. To preset the altitude threshold, As the first coefficient, They are respectively hour, Altitude correction factor at time, This is the correction factor for carbon dioxide concentration. This refers to the carbon dioxide concentration inside the train. This is a preset carbon dioxide concentration threshold.

[0019] This invention addresses the technical problem of significant air quality differences between the beginning and end of a train train when running in long tunnels. It introduces a first coefficient with the total tunnel length as the independent variable to linearly amplify the baseline airflow over distance, thus preemptively offsetting leakage along the route. This solves the issue of positive pressure overflow at the front of the train and negative pressure suction at the rear, leading to fresh air short-circuiting and exhaust backflow. Secondly, by incorporating altitude and an altitude correction coefficient into the baseline airflow calculation formula, it avoids hidden oxygen deficiency and ensures a constant mass airflow rather than a volumetric airflow. Thirdly, the combination of slow baseline airflow response and rapid compensation airflow response not only avoids long-term excessive air supply and reduces system energy consumption but also quickly reduces transient pressure fluctuations caused by trains passing through ventilation shafts or meeting other trains, thereby improving passenger comfort. In summary, this invention solves the three major technical challenges of high-altitude hypoxia, leakage in long tunnels, and transient impacts, while achieving comprehensive benefits of energy saving, cost reduction, comfort, and safety.

[0020] In some embodiments, the above method further includes the following steps:

[0021] When the difference between the oxygen concentration inside the train and the set oxygen concentration When the oxygen concentration exceeds the preset threshold, the oxygen production rate is set to [value]. Otherwise, the oxygen production rate is set to zero; where, This is the oxygen concentration correction factor.

[0022] In some embodiments, the above method further includes the following steps:

[0023] When the pressure difference between inside and outside the train When the pressure exceeds the preset threshold, increase the opening of the fresh air valve. Otherwise, the opening degree of the fresh air valve remains unchanged; where, This is the adjustment coefficient for the opening degree of the fresh air valve.

[0024] In some embodiments, the above method further includes the following steps:

[0025] When the pressure difference between inside and outside the train When the pressure exceeds the closing threshold of the pressure protection valve, fully open the pressure protection valve, fully close the fresh air valve, and set the fan speed to the minimum wind speed.

[0026] When the pressure difference between inside and outside the train When the pressure protection valve opening threshold is less than or equal to the pressure protection valve opening threshold, fully close the pressure protection valve, fully open the fresh air valve, and set the fan speed to the maximum wind speed.

[0027] On the other hand, a train interior air conditioning system is provided, comprising:

[0028] The data acquisition unit is used to acquire the total length of the tunnel the train is currently passing through, the train's current altitude, and the carbon dioxide concentration inside the train.

[0029] Fans; and

[0030] The control unit is used to determine the reference air volume every first cycle based on the total length of the tunnel the train is currently passing through and the train's current altitude. Every second cycle, the compensation air volume is determined based on the carbon dioxide concentration inside the train. Set the total air volume of the fan to the sum of the baseline air volume and the compensation air volume;

[0031] in,

[0032] The first cycle is longer than the second cycle;

[0033] when and hour, ;

[0034] when hour, ;

[0035] Other situations ;

[0036] when hour, ;otherwise ;

[0037] In the formula, This is the total length of the tunnel the train is currently passing through. This is the train's current altitude. To preset the altitude threshold, As the first coefficient, They are respectively hour, Altitude correction factor at time, This is the correction factor for carbon dioxide concentration. This refers to the carbon dioxide concentration inside the train. This is a preset carbon dioxide concentration threshold.

[0038] In some embodiments, the system further includes an oxygen generator; the data acquisition unit is also used to acquire the oxygen concentration inside the train car;

[0039] The control unit is used to measure the difference between the oxygen concentration inside the train and the set oxygen concentration. When the oxygen concentration exceeds the preset threshold, the oxygen generator's oxygen production rate will be set to [value]. Otherwise, the oxygen production rate is set to zero; where, This is the oxygen concentration correction factor.

[0040] In some embodiments, the system further includes a fresh air valve; the data acquisition unit is also used to acquire the pressure inside and outside the train; the control unit is used to handle pressure differences between inside and outside the train. When the pressure exceeds the preset threshold, increase the opening of the fresh air valve. Otherwise, the opening degree of the fresh air valve remains unchanged; where, This is the adjustment coefficient for the opening degree of the fresh air valve.

[0041] In some embodiments, the system further includes a pressure protection valve and a pressure protection valve; the control unit is used for:

[0042] When the pressure difference between inside and outside the train When the pressure exceeds the closing threshold of the pressure protection valve, fully open the pressure protection valve, fully close the fresh air valve, and set the fan speed to the minimum wind speed.

[0043] When the pressure difference between inside and outside the train When the pressure protection valve opening threshold is less than or equal to the pressure protection valve opening threshold, fully close the pressure protection valve, fully open the fresh air valve, and set the fan speed to the maximum wind speed.

[0044] In another aspect, a train interior air conditioning device is provided, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the above method.

[0045] In another aspect, a computer-readable storage medium is provided that stores a computer program or instructions thereon, which, when executed by a processor, implement the steps of the above-described method.

[0046] This invention has at least the following technical effects or advantages: Firstly, by introducing a first coefficient with the total tunnel length as the independent variable, the invention linearly amplifies the baseline airflow with mileage, preemptively offsetting leakage along the tunnel. This solves the technical problem of positive pressure overflow at the front of the train and negative pressure suction at the rear, leading to short-circuiting of fresh air and backflow of exhaust air, resulting in significant differences in air quality between the front and rear sections of the same trainset when the train is running in extra-long tunnels. Secondly, by introducing an altitude correction coefficient into the baseline airflow calculation formula, it avoids hidden hypoxia and ensures that the mass airflow, rather than the volumetric airflow, remains constant. Thirdly, the combination of slow response of the baseline airflow and fast response of the compensation airflow not only avoids long-term excessive air supply and reduces system energy consumption, but also quickly reduces transient pressure fluctuations caused by trains passing through ventilation shafts or meeting other trains, thereby improving passenger comfort. In summary, this invention solves the three major technical challenges of high-altitude hypoxia, leakage in extra-long tunnels, and transient impacts, while achieving comprehensive benefits of energy saving, cost reduction, comfort, and safety. Attached Figure Description

[0047] Figure 1 This is a schematic flowchart of a train interior air conditioning method according to an embodiment of the present invention. Detailed Implementation

[0048] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0049] Example 1

[0050] See Figure 1 A method for regulating air inside a train includes the following steps:

[0051] S1. Determine the baseline air volume based on the total length of the tunnel the train is currently passing through and the train's current altitude;

[0052] S2. Determine the compensation air volume based on the carbon dioxide concentration inside the train;

[0053] S3. Set the total air volume of the fan to the sum of the base air volume and the compensation air volume;

[0054] Among them, the reference air volume The methods for determining this include:

[0055] when hour, ;

[0056] when hour, ;

[0057] Other situations ;

[0058] Compensating air volume The methods for determining this include:

[0059] when hour, ;otherwise ;

[0060] The baseline air volume is determined once every first cycle, and the compensation air volume is determined once every second cycle, with the first cycle being longer than the second cycle.

[0061] Preferably, the total air volume of the fan is obtained. Then, the fan speed can be calculated using the following formula. , The minimum fan speed is 600. The maximum value is 1800. .

[0062] In the formula, The total length of the tunnel the train is currently passing through, in units of ; The current altitude of the train, in units ; This is a preset altitude threshold, in meters (m). The first coefficient has a value of 1.2. They are respectively hour, The altitude correction factor at that time, where The value is 0.6. The value is 0.8; This is a correction factor for carbon dioxide concentration, in units of... ; The carbon dioxide concentration inside the train, in units ; To preset the carbon dioxide concentration threshold, in units .

[0063] In this embodiment, the carbon dioxide concentration correction factor The value is set to The preset carbon dioxide concentration threshold is set to 1000. The minimum baseline air volume is 1800. The maximum value is 4500 The first cycle can be set to 1 minute, and the second cycle can be set to 3 seconds.

[0064] It should be noted that the first coefficient and the altitude correction coefficient in this invention can be determined through offline calibration and regression fitting, and the specific steps are as follows:

[0065] 1. Experimental Design (completed in an environmentally controlled chamber)

[0066] Subjects: A single 1:1 scale model of a train carriage, equipped with a high static pressure fan, adjustable ramp, and variable altitude simulation tank.

[0067] a) Factor level:

[0068] altitude : 0, 1000, 2000, 3000 m (4 levels)

[0069] Total length of tunnel : 0, 2, 4, 6, 8 km (5 levels)

[0070] slope : 0, ±5, ±10‰ (minor factors, fix 0‰ for the first round)

[0071] b) Evaluation indicators:

[0072] Put the car inside steady-state error , The minimum required fresh air volume is denoted as .

[0073] Test points: 4 × 5 = 20 groups, steady state 30 for each group Measure 3 times and take the average.

[0074] 2. Data Regression

[0075] 20 groups Input MATLAB's regression:

[0076] ;

[0077] result:

[0078] ;

[0079] ;

[0080] ;

[0081] 3. Round to "engineering-friendly number"

[0082] ;

[0083] 4. Refitting separately for high-altitude sections

[0084] when At that time, the fan's air volume is "artificially high" due to the decrease in air density, and continuing to use the same slope will cause overshoot.

[0085] Do 6 more sets Experiment, to right Linear regression yields a slope of -0.78, which is rounded to -0.8.

[0086] First coefficient

[0087] Section elevation correction factor

[0088] Altitude correction factor

[0089] The coefficients 1.2, 0.6, and 0.8 were obtained from offline calibration test data through least squares regression, rounded, and then incorporated into this preset algorithm. They will not be changed during operation.

[0090] In addition, coefficient Both are products of "offline calibration + engineering rounding," and the specific steps are as follows:

[0091] 1. (Oxygen concentrator flow rate) (deviation slope)

[0092] 1.1 Test Apparatus

[0093] Enclosed carriage environmental control compartment, volume

[0094] Adjustable Source+ Oxygen Concentrator

[0095] laser Sensor, ±0.1% accuracy

[0096] 1.2 Test Procedure

[0097] a) Put the initial It dropped to 22.0% (2.5% lower than the target of 24.5%).

[0098] b) The oxygen concentrator starts from 0, every add Record steady state Increase;

[0099] c) Perform 3 repetitions, take the average, and you will get 10 sets. ) data.

[0100] 1.3 Linear Regression

[0101] ;

[0102] Conversely

[0103] ;

[0104] Rounding up to the calculated value

[0105] Fitting Maximum error ,satisfy There is a surplus of indicators.

[0106] 2. (fresh air volume) (Excess slope)

[0107] 2.1 Test Conditions

[0108] Initial inside the car Stepping to dry ice evaporator ;

[0109] Adjust only the fresh air valve, keep the fan speed constant. Record steady state It varies with the amount of fresh air.

[0110] 2.2 Data

[0111] Each increase Additional fresh air is required. The average is 2.48.

[0112] Round

[0113] verify: Exceeding the standard section Pull-back The following meet the requirements of GB / T 12815.

[0114] 3. (The ratio of the angle of the fresh air valve to the differential pressure gain)

[0115] 3.1 Test bench

[0116] Train carriage model Programmable pneumatic step stage

[0117] Fresh air valve Electric actuator, full stroke

[0118] Differential pressure sensor accuracy

[0119] 3.2 Step Response Method

[0120] a) Let Step jump;

[0121] b) Try different ,Record Back Adjustment time With overshoot ;

[0122] c) Select "No overshoot and" "the largest" .

[0123] result:

[0124]

[0125] Occasionally Overshoot

[0126] Take the middle conservative value

[0127] This value has been reserved. Gain margin, can cover maximum deviation.

[0128] coefficient and All values ​​are determined by offline static calibration test data using the least squares or step response method, rounded to engineering-friendly values, and stored in the MCU read-only area, and cannot be changed online during operation.

[0129] As a preferred embodiment, the above method further includes the following steps:

[0130] When the difference between the oxygen concentration inside the train and the set oxygen concentration When the oxygen concentration exceeds the preset threshold, the oxygen production rate is set to [value]. Otherwise, the oxygen production rate is set to zero; where, This is the oxygen concentration correction factor, in units of... .

[0131] In this embodiment, the oxygen concentration correction factor The value is set to The oxygen concentration is set to 24.5%, and the preset oxygen concentration threshold is set to 0.7%. The minimum oxygen production is 0, and the maximum is... .

[0132] As a preferred embodiment, the above method further includes the following steps:

[0133] When the pressure difference between inside and outside the train When the pressure exceeds the preset threshold, increase the opening of the fresh air valve. Otherwise, the opening degree of the fresh air valve remains unchanged; where, This is the adjustment coefficient for the opening degree of the fresh air valve.

[0134] In this embodiment, the fresh air valve opening adjustment coefficient The value is set to The preset pressure threshold is set to 10Pa. The minimum opening degree of the fresh air valve is 15°, and the maximum opening degree is 90°.

[0135] More preferably,

[0136] When the pressure difference between inside and outside the train When the pressure exceeds the closing threshold of the pressure protection valve, fully open the pressure protection valve, fully close the fresh air valve, and set the fan speed to the minimum wind speed.

[0137] When the pressure difference between inside and outside the train When the pressure protection valve opening threshold is less than or equal to the pressure protection valve opening threshold, fully close the pressure protection valve, fully open the fresh air valve, and set the fan speed to the maximum wind speed.

[0138] In this embodiment, the pressure protection valve closing threshold is set to... The pressure protection valve opening threshold is set to – .

[0139] Example 2

[0140] A train interior air conditioning system, comprising:

[0141] The data acquisition unit is used to acquire the total length of the tunnel the train is currently passing through, the train's current altitude, and the carbon dioxide concentration inside the train.

[0142] Fans; and

[0143] The control unit is used to determine the reference air volume every first cycle based on the total length of the tunnel the train is currently passing through and the train's current altitude. Every second cycle, the compensation air volume is determined based on the carbon dioxide concentration inside the train. Set the total air volume of the fan to the sum of the baseline air volume and the compensation air volume;

[0144] in,

[0145] The first cycle is longer than the second cycle;

[0146] when and hour, ;

[0147] when hour, ;

[0148] Other situations ;

[0149] when hour, ;otherwise ;

[0150] Preferably, the total air volume of the fan is obtained. Then, the control unit calculates the fan speed using the following formula. , The minimum fan speed is 600. The maximum value is 1800. .

[0151] In the formula, The total length of the tunnel the train is currently passing through, in units of ; The current altitude of the train, in units ; To preset the altitude threshold, the unit is... ; The first coefficient has a value of 1.2. They are respectively hour, The altitude correction factor at that time, where The value is 0.6. The value is 0.8; This is a correction factor for carbon dioxide concentration, in units of... ; The carbon dioxide concentration inside the train, in units ; To preset the carbon dioxide concentration threshold, in units .

[0152] In this embodiment, the carbon dioxide concentration correction factor The value is set to The preset carbon dioxide concentration threshold is set to 1000. The minimum baseline air volume is 1800. The maximum value is 4500 The first cycle can be set to 1 minute, and the second cycle can be set to 3 seconds.

[0153] As a preferred embodiment, the system further includes an oxygen generator; the data acquisition unit is also used to acquire the oxygen concentration inside the train car; and the control unit is used to handle the difference between the oxygen concentration inside the train car and a set oxygen concentration. When the oxygen concentration exceeds the preset threshold, the oxygen generator's oxygen production rate will be set to [value]. Otherwise, the oxygen production rate is set to zero; where, This is the oxygen concentration correction factor. In this embodiment, the oxygen concentration correction factor... The value is set to 3 The oxygen concentration is set to 24.5%, and the preset oxygen concentration threshold is set to 0.7%. The minimum oxygen production is 0, and the maximum is 15. .

[0154] As a preferred embodiment, the system also includes a fresh air valve; the data acquisition unit is also used to acquire the pressure inside and outside the train; and the control unit is used to handle pressure differences between the inside and outside of the train. When the pressure exceeds the preset threshold, increase the opening of the fresh air valve. Otherwise, the opening degree of the fresh air valve remains unchanged; where, This is the adjustment coefficient for the fresh air valve opening. In this embodiment, the fresh air valve opening adjustment coefficient... The value is set to 0.3 The preset pressure threshold is set to 10. The minimum opening degree of the fresh air valve is 15°, and the maximum is 90°.

[0155] As a preferred embodiment, the above system further includes a pressure protection valve and a pressure protection valve; the control unit is used for:

[0156] When the pressure difference between inside and outside the train When the pressure exceeds the closing threshold of the pressure protection valve, fully open the pressure protection valve, fully close the fresh air valve, and set the fan speed to the minimum wind speed.

[0157] When the pressure difference between inside and outside the train When the pressure protection valve opening threshold is less than or equal to the pressure protection valve opening threshold, fully close the pressure protection valve, fully open the fresh air valve, and set the fan speed to the maximum wind speed.

[0158] In this embodiment, the pressure protection valve closing threshold is set to +550. The pressure protection valve opening threshold is set to -550. .

[0159] It should be noted that the data acquisition unit includes pressure sensors and distributed infrared sensors located in the train driver's cab and passenger compartments. Sensors and lasers Sensors. The pressure outside the train can be determined by looking up an altitude-atmospheric pressure table based on the train's current altitude.

[0160] Example 3

[0161] An air conditioning device for train interiors includes a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method in Embodiment 1.

[0162] Example 4

[0163] A computer-readable storage medium having a computer program or instructions stored thereon, which, when executed by a processor, implements the steps of the method in Embodiment 1.

[0164] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0165] Similarly, it should be understood that, in order to streamline this disclosure and aid in understanding one or more of the various aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of disclosure should not be interpreted as reflecting an intention that the claimed invention requires more features than expressly recited in each claim. Rather, as reflected in the claims, inventive aspects lie in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of the invention.

[0166] Those skilled in the art will understand that the modules, units, or groups of devices in the examples disclosed herein can be arranged in the device as described in this embodiment, or alternatively, can be located in one or more devices different from the device in this example. The modules in the foregoing examples can be combined into a single module or further divided into multiple sub-modules.

[0167] Those skilled in the art will understand that modules in the device of the embodiments can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or groups in the embodiments can be combined into a single module, unit, or group, and further, they can be divided into multiple sub-modules, sub-units, or sub-groups. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0168] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are meant to be within the scope of the invention and form different embodiments.

[0169] Furthermore, some of the embodiments described herein are methods or combinations of method elements that can be implemented by a processor of a computer system or by other means of performing the functions. Therefore, a processor having the necessary instructions for implementing the methods or method elements forms means for implementing the methods or method elements. Furthermore, the elements described herein in the apparatus embodiments are examples of means for implementing the functions performed by elements for the purposes of carrying out the invention.

[0170] The various techniques described herein can be implemented in combination with hardware or software, or a combination thereof. Thus, the methods and apparatus of the present invention, or certain aspects or portions thereof, can take the form of program code (i.e., instructions) embedded in a tangible medium, such as a floppy disk, CD-ROM, hard disk, or any other machine-readable storage medium, wherein when the program is loaded into and executed by a machine such as a computer, the machine becomes an apparatus for practicing the present invention.

[0171] When the program code is executed on a programmable computer, the computing device generally includes a processor, a processor-readable storage medium (including volatile and non-volatile memory and / or storage elements), at least one input device, and at least one output device. The memory is configured to store program code; the processor is configured to execute the method of the present invention according to instructions in the program code stored in the memory.

[0172] By way of example, and not limitation, computer-readable media include computer storage media and communication media. Computer storage media stores information such as computer-readable instructions, data structures, program modules, or other data. Communication media generally embodies computer-readable instructions, data structures, program modules, or other data in the form of modulated data signals such as carrier waves or other transmission mechanisms, and includes any information delivery medium. Any combination of the above is also included within the scope of computer-readable media.

[0173] As used herein, unless otherwise specified, the use of ordinal numbers such as “first,” “second,” “third,” etc., to describe ordinary objects merely indicates different instances of similar objects and is not intended to imply that the objects being described must have a given order in time, space, ordering, or any other manner.

[0174] Although the invention has been described with reference to a limited number of embodiments, those skilled in the art will understand from the foregoing description that other embodiments are conceivable within the scope of the invention described herein. Furthermore, it should be noted that the language used in this specification has been chosen primarily for readability and instructional purposes, and not for the purpose of interpreting or limiting the subject matter of the invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the invention is illustrative and not restrictive, and the scope of the invention is defined by the appended claims.

[0175] Finally, it should be noted that this invention does not explain in detail the common knowledge recognized by those skilled in the art. The above description is only a specific embodiment of this invention and is not intended to limit this invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the protection scope of this invention.

Claims

1. A method for air conditioning inside a train, characterized in that, Includes the following steps: S1. Determine the baseline air volume based on the total length of the tunnel the train is currently passing through and the train's current altitude; S2. Determine the compensation air volume based on the carbon dioxide concentration inside the train; S3. Set the total air volume of the fan to the sum of the base air volume and the compensation air volume; Among them, the reference air volume The methods for determining this include: when and hour, ; when hour, ; Other situations ; Compensating air volume The methods for determining this include: when hour, ;otherwise ; The baseline air volume is determined once every first cycle, and the compensation air volume is determined once every second cycle, with the first cycle being longer than the second cycle. In the formula, This is the total length of the tunnel the train is currently passing through. This is the train's current altitude. To preset the altitude threshold, As the first coefficient, They are respectively hour, Altitude correction factor at time, This is the correction factor for carbon dioxide concentration. This refers to the carbon dioxide concentration inside the train. This is a preset carbon dioxide concentration threshold.

2. The train interior air conditioning method according to claim 1, characterized in that... It also includes the following steps: When the difference between the oxygen concentration inside the train and the set oxygen concentration When the oxygen concentration exceeds the preset threshold, the oxygen production rate is set to [value]. ; Otherwise, the oxygen production rate is set to zero; where, This is the oxygen concentration correction factor.

3. The train interior air conditioning method according to claim 1 or 2, characterized in that... It also includes the following steps: When the pressure difference between inside and outside the train When the pressure exceeds the preset threshold, increase the opening of the fresh air valve. Otherwise, the opening degree of the fresh air valve remains unchanged; where, This is the adjustment coefficient for the opening degree of the fresh air valve.

4. The train interior air conditioning method according to claim 3, characterized in that... It also includes the following steps: When the pressure difference between inside and outside the train When the pressure exceeds the closing threshold of the pressure protection valve, fully open the pressure protection valve, fully close the fresh air valve, and set the fan speed to the minimum wind speed. When the pressure difference between inside and outside the train When the pressure protection valve opening threshold is less than or equal to the pressure protection valve opening threshold, fully close the pressure protection valve, fully open the fresh air valve, and set the fan speed to the maximum wind speed.

5. A train interior air conditioning system, characterized in that, include: The data acquisition unit is used to acquire the total length of the tunnel the train is currently passing through, the train's current altitude, and the carbon dioxide concentration inside the train. Fan; and The control unit is used to determine the reference air volume every first cycle based on the total length of the tunnel the train is currently passing through and the train's current altitude. Every second cycle, the compensation air volume is determined based on the carbon dioxide concentration inside the train. Set the total air volume of the fan to the sum of the baseline air volume and the compensation air volume; in, The first cycle is longer than the second cycle; when and hour, ; when hour, ; Other situations ; when hour, ;otherwise ; In the formula, This is the total length of the tunnel the train is currently passing through. This is the train's current altitude. To preset the altitude threshold, As the first coefficient, They are respectively hour, Altitude correction factor at time, This is the correction factor for carbon dioxide concentration. This refers to the carbon dioxide concentration inside the train. This is a preset carbon dioxide concentration threshold.

6. The train interior air conditioning system according to claim 5, characterized in that: It also includes an oxygen generator; the data acquisition unit is also used to acquire the oxygen concentration inside the train. The control unit is used to measure the difference between the oxygen concentration inside the train and the set oxygen concentration. When the oxygen concentration exceeds the preset threshold, the oxygen generator's oxygen production rate will be set to [value]. ; Otherwise, the oxygen production rate is set to zero; where, This is the oxygen concentration correction factor.

7. The train interior air conditioning system according to claim 5 or 6, characterized in that: It also includes a fresh air valve; the data acquisition unit is also used to acquire the pressure inside and outside the train; The control unit is used to handle pressure differences between the inside and outside of the train. When the pressure exceeds the preset threshold, increase the opening of the fresh air valve. Otherwise, the opening degree of the fresh air valve remains unchanged; where, This is the adjustment coefficient for the opening degree of the fresh air valve.

8. The train interior air conditioning system according to claim 7, characterized in that: It also includes pressure protection valves and pressure protection valves; The control unit is used for: When the pressure difference between inside and outside the train When the pressure exceeds the closing threshold of the pressure protection valve, fully open the pressure protection valve, fully close the fresh air valve, and set the fan speed to the minimum wind speed. When the pressure difference between inside and outside the train When the pressure protection valve opening threshold is less than or equal to the pressure protection valve opening threshold, fully close the pressure protection valve, fully open the fresh air valve, and set the fan speed to the maximum wind speed.

9. A train interior air conditioning device, comprising a memory, a processor, and a computer program stored in the memory, characterized in that, The processor executes the computer program to implement the steps of the method according to any one of claims 1-4.

10. A computer-readable storage medium having a computer program or instructions stored thereon, characterized in that, When the computer program / instructions are executed by the processor, they implement the steps of the method according to any one of claims 1-4.

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