A vehicle air conditioning control method, control device, and vehicle air conditioning system.

Abstract

This invention relates to a vehicle air conditioning control method, control device, and vehicle air conditioning system. The control method includes the following steps: S1, acquiring the outdoor ambient temperature T. em S2, determine whether the ambient temperature meets the conditions set for the transition season; em When the transitional season conditions are met, the transitional season mode is executed, which introduces fresh outdoor air into the vehicle to regulate the interior temperature; S3, when the ambient temperature T em When the transitional season conditions are not met, the air conditioning cooling / heating mode is activated. This invention determines the temperature based on the characteristics of the transitional season. When the transitional season conditions are met, the indoor temperature is controlled solely by introducing fresh air at a lower outdoor temperature. This not only achieves energy savings for the vehicle's air conditioning but also avoids frequent compressor starts and stops under these conditions, extending the compressor's lifespan.

Description

Technical Field

[0001] This invention belongs to the field of vehicle air conditioning technology, and specifically relates to a vehicle air conditioning control method, control device, and vehicle air conditioning system. Background Technology

[0002] Air conditioning systems are generally installed on rail vehicles such as high-speed trains and subways to regulate the temperature and humidity inside the carriages. In addition to the air conditioning units, these systems include fresh air intake systems and exhaust systems. The fresh air intake system introduces fresh air into the carriages, while the exhaust system simultaneously removes stale air from the carriages. By controlling the fresh air volume and exhaust volume, the system maintains a slightly positive pressure inside the carriages while ensuring air freshness.

[0003] Current vehicle air conditioning systems adjust fresh air volume based on passenger load. By analyzing parameters such as vehicle weight and carbon dioxide concentration to determine passenger capacity, the system controls the opening of the fresh air valve or the speed of the fresh air fan to regulate the amount of fresh air. Currently, air conditioning systems operate on a year-round fresh air adjustment model.

[0004] Existing rail vehicle air conditioning units generally operate in three modes: cooling, ventilation, and heating, typically distinguished by ambient temperature. However, during the transitional spring and autumn seasons, while outdoor temperatures are generally lower, indoor temperatures tend to be higher due to factors such as passenger load and solar radiation. When the temperature hovers around the boundary between these three modes (during the transitional season), the following two situations may occur:

[0005] 1. When the temperature is within the boundary between cooling and ventilation, there is a heat load inside the vehicle due to the occupants and solar radiation from the vehicle body. Since the fresh air volume is limited, the cooling mode can be turned on to cool down the vehicle. However, due to the low cooling load demand, the compressor starts and stops frequently, which cannot achieve continuous and stable output and affects the life of the compressor.

[0006] 2. When the temperature is within the boundary between heating and ventilation, the heating load demand in the vehicle is low, and the compressor starts and stops frequently to maintain the indoor temperature, which affects the life of the compressor; while directly turning on the ventilation mode will cause the indoor temperature to be lower than the set temperature, thus causing discomfort to passengers. Summary of the Invention

[0007] The main technical problem solved by this invention is to provide a vehicle air conditioning control method that uses outdoor fresh air to control indoor temperature based on the characteristics of the transitional season, thereby achieving maximum fresh air volume and energy saving. It also provides a vehicle air conditioning control device for implementing the control method, as well as a vehicle air conditioning system using the control method.

[0008] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0009] A vehicle air conditioning control method, characterized by comprising the following steps:

[0010] S1. Obtain the ambient temperature outside the vehicle, T. em Determine the ambient temperature T em Does it meet the conditions set for the transitional season?

[0011] S2, when the ambient temperature T em When the conditions for the transitional season are met, the air conditioning system is controlled to execute the transitional season mode, which uses fresh air from outside the vehicle to regulate the temperature inside the cabin.

[0012] S3, when the ambient temperature T em When the transitional season setting conditions are not met, the air conditioning system is controlled to execute the cooling / heating / ventilation setting mode.

[0013] Furthermore, the formula for determining the conditions for the transitional season is: T ed <T em <T eq ;

[0014] In the formula, T em For ambient temperature, T eq The highest temperature in the transitional season pattern, T ed This is the lowest temperature in the transitional season pattern.

[0015] Furthermore, the minimum temperature T in the transitional season mode ed The value range is 8 to 12℃.

[0016] Furthermore, the highest temperature T in the transitional season mode eq The formula for calculating the value of T is as follows: eq = (K1-K2*K3) / (1-K2);

[0017] In the formula, coefficient K1 is determined based on the lower limit of the vehicle interior cooling setting temperature during the cooling season, coefficient K2 is the result correction coefficient based on the vehicle operation requirements, and coefficient K3 is determined based on the difference between the vehicle interior setting temperature and the vehicle exterior design conditions.

[0018] Preferably, 20≤K1≤23, 0.2≤K2≤0.4, and 14≤K3≤18.

[0019] Furthermore, the transitional season pattern includes the following steps:

[0020] S21. Adjust the fresh air volume to the maximum air volume;

[0021] S22. Adjust the return air volume and / or the fan frequency accordingly to keep the temperature inside the carriage within the set range.

[0022] Furthermore, in step S21,

[0023] The fresh air volume is adjusted to the maximum air volume by opening the fresh air valve to the maximum angle.

[0024] Furthermore, in step S22, the adjustment of the return air volume is obtained by adjusting the opening of the return air valve, and the opening of the return air valve is adjusted according to the following formula;

[0025] Return air valve opening degree = total opening degree * m * T ic / (T ic -T in );

[0026] In the formula, T ic Set the temperature inside the carriage, T in The actual temperature inside the carriage is denoted as m, which is a variable.

[0027] Preferably, the value range of variable m is 0.005 to 0.03.

[0028] Furthermore, in step S22, the frequency of the ventilator is adjusted according to the following formula;

[0029] Ventilation fan frequency = rated frequency * variable x;

[0030] In the formula, the variable x is the offset of the fan frequency during the transition season;

[0031] Preferably, the variable x satisfies the fan airflow offset y when operating in the transitional season mode;

[0032] More preferably, the value range of the fan air volume offset y is 0 to 300%.

[0033] Another technical solution of the present invention is:

[0034] A vehicle air conditioning control device includes: an acquisition module for acquiring the current outdoor ambient temperature and determining whether the transitional season setting conditions are met; and a control module for controlling the air conditioning system to execute a transitional season mode when the ambient temperature meets the transitional season setting conditions, and controlling the air conditioning system to execute a cooling / heating / ventilation setting mode when the ambient temperature does not meet the transitional season setting conditions.

[0035] Another technical solution of the present invention is:

[0036] A vehicle air conditioning system employs the vehicle air conditioning control method described above.

[0037] In summary, the vehicle air conditioning control method, control device, and vehicle air conditioning system provided by this invention have the following advantages compared with the prior art:

[0038] (1) Based on the characteristics of the transition season, this invention determines the transition season by measuring the ambient temperature outside the vehicle. When the conditions for the transition season are met, the temperature inside the vehicle is controlled by introducing fresh air with a lower outside temperature. This not only achieves the purpose of energy saving in the vehicle air conditioning system, but also avoids frequent start-stop of the compressor under this condition, thus extending the life of the compressor.

[0039] (2) This invention uses reasonable judgment logic to determine the minimum temperature T of the transitional season mode based on the region and model of the vehicle. ed and the highest temperature T in the transitional season pattern eq The range of values ​​fully considers all factors affecting the temperature during the transition season, making the determination logic for the transition season simpler and more accurate. It can also meet the needs of vehicles operating in different regions during the transition season, ensuring the optimal comfort of the cabin environment while achieving energy conservation.

[0040] (3) When the present invention determines that the transition season setting conditions are met and the transition season mode is to be operated, the fresh air volume is adjusted to the maximum, and the temperature inside the carriage is further controlled by controlling the return air volume and the frequency of the ventilation fan, which greatly simplifies the control logic of the transition season mode.

[0041] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0042] The accompanying drawings, as part of this invention, are provided to further illustrate the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation thereof. Clearly, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0043] In the attached diagram:

[0044] Figure 1 This is a flowchart of the control method of the present invention.

[0045] It should be noted that the accompanying drawings and text description are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0047] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0049] like Figure 1 As shown, this invention provides a vehicle air conditioning control method for air conditioning systems in rail transit vehicles such as subways and high-speed trains. The operating conditions of the air conditioning system include cooling, ventilation, and heating, which are typically distinguished by ambient temperature. During the transitional seasons of spring and autumn, outdoor temperatures are generally lower, but indoor temperatures are higher due to factors such as passenger load and solar radiation load. When the outdoor ambient temperature is between spring and autumn, the cooling and heating load inside the carriage is lower than in summer and winter. Therefore, during the spring and autumn transitional seasons, it is preferable to use the relatively cooler outdoor air to regulate the temperature inside the carriage to achieve energy conservation. Fresh air from outside is delivered into the carriage using a ventilation fan installed in the air conditioning unit.

[0050] The vehicle air conditioning control method provided by this invention specifically includes the following steps:

[0051] S1. Obtain the ambient temperature outside the vehicle, T. em Determine the ambient temperature T em Does it meet the conditions set for the transitional season?

[0052] S2, when the ambient temperature T em When the conditions for the transitional season are met, the air conditioning system is controlled to execute the transitional season mode, which uses fresh air from outside the vehicle to regulate the temperature inside the cabin.

[0053] S3, when the ambient temperature T em When the transitional season setting conditions are not met, the air conditioning system is controlled to execute the cooling / heating / ventilation setting mode.

[0054] In this embodiment, the transitional season setting condition is preferably determined by temperature, and the determination formula is as follows:

[0055] T ed <T em <T eq。 (1)

[0056] In equation (1), T em For ambient temperature, T eq The highest temperature in the transitional season pattern, T ed This is the lowest temperature in the transitional season pattern.

[0057] When the ambient temperature outside the car is T em The highest temperature T during the transitional season eq and the lowest temperature T in the transitional season pattern ed When the outdoor ambient temperature T is between 10:00 and 11:00, it is considered to be the transitional season, and the vehicle's air conditioning system will be controlled to operate in transitional season mode. em Greater than or equal to the highest temperature T in the transitional season pattern eq When the outdoor ambient temperature T is reached, the system enters summer (cooling season) mode and controls the air conditioner to operate in cooling mode. em Less than or equal to the lowest temperature T in the transitional season pattern ed When the vehicle enters winter (heating season) mode, the air conditioning is controlled to operate in heating mode. Both cooling and heating modes use the conventional control modes found in existing vehicles. The air conditioning system is controlled based on the difference between the actual temperature inside the passenger compartment and the set temperature to maintain the temperature within the set range. Simultaneously, the fresh air volume and exhaust air volume of the passenger compartment are controlled based on passenger load and other information to ensure air freshness.

[0058] Due to the complex operating environment of rail vehicles, the operating conditions of rail vehicles operating in different regions vary greatly. To simplify the control logic of the air conditioning system and the logic for determining whether the transition season has begun, this embodiment further optimizes the minimum temperature T in the transition season mode. ed The value range is 8–12℃. This T... ed The choice of value depends on the latitude and longitude of the area where the vehicle operates and the vehicle's load, and can also be determined based on usage habits. For example: if the vehicle operates in the south, and the interior of the vehicle primarily requires cooling, then T... ed We recommend selecting a low temperature of 8℃; the vehicle operates in northern regions, where the interior is primarily in heating mode. ed We recommend selecting a high temperature of 12℃.

[0059] Transitional Season Mode Minimum Temperature T ed Before the vehicle leaves the factory, the minimum temperature T for the transitional season mode of the vehicle is determined based on the region where the vehicle will be operated. ed And it is stored in the air conditioning system controller. Of course, the minimum temperature T in the transitional season mode... edAdjustments can be made based on actual operating conditions after a period of operation, and the adjusted values ​​are stored in the air conditioning system controller. The determination of transitional seasons is based on the adjusted values.

[0060] Transitional Season Mode Maximum Temperature T eq The value of is determined according to the following calculation formula (2):

[0061] T eq = (K1-K2*K3) / (1-K2) (2).

[0062] In equation (2), coefficient K1 is determined based on the lower limit of the vehicle interior cooling setting temperature during the cooling season, coefficient K2 is the result correction coefficient based on the vehicle operation requirements, and coefficient K3 is determined based on the difference between the vehicle interior setting temperature and the vehicle exterior design conditions.

[0063] In this embodiment, based on numerous experiments, the preferred ranges for the coefficients K1, K2, and K3 are 20≤K1≤23, 0.2≤K2≤0.4, and 14≤K3≤18.

[0064] The coefficient K1 has an inverse relationship with the lower limit of the vehicle's interior cooling setting temperature; that is, the higher the lower limit of the cooling setting temperature, the smaller the value of K1, and vice versa. The selection of coefficient K1 is based on extensive experiments and experience. This lower limit of the cooling setting temperature is the lower limit of the interior cooling setting temperature during the spring and autumn transition seasons.

[0065] K2 is a correction factor for the results, calculated based on the highest temperature T in the transitional season model. eq Then, the results are adjusted according to the usage needs of vehicles in different regions to ensure that the calculated maximum temperature T in the transitional season model is accurate. eq More precise and better able to meet the usage needs of the operating areas.

[0066] The coefficient K3 is determined based on the difference between the vehicle's interior set temperature and its exterior design operating conditions. The larger the difference, the lower the value of K3; conversely, the smaller the difference, the higher the value of K3. Similarly, the selection of coefficient K3 is based on extensive testing and experience. For example, vehicles operating in northern regions (such as Qingdao) and southern regions (such as Shanghai) both have an exterior design operating condition (exterior design ambient temperature) of 35℃. Vehicles operating in the north have an interior set temperature of 24℃, while vehicles operating in the south have an interior set temperature of 26℃. Therefore, the value of K3 for vehicles operating in the north is lower than that for vehicles operating in the south.

[0067] This embodiment provides an example, as shown in the table below:

[0068] <![CDATA[T ed ]]> <![CDATA[K1]]> <![CDATA[K2]]> <![CDATA[K3]]> <![CDATA[T eq ]]> 10℃ 22 0.28 17.5 23.8℃ 8℃ 20 0.2 18 20.5℃ 12℃ 23 0.4 14 29.0℃

[0069] The coefficients K1, K2, and K3 are determined based on the region and model of the vehicle. Before the vehicle leaves the factory, the coefficients K1, K2, and K3 are determined based on the region where the vehicle will operate, and the maximum temperature T of the transitional season mode is calculated according to formula (2). eq The values ​​are stored in the air conditioning system controller. Of course, coefficients K1, K2, and K3 can also be adjusted after a period of operation based on actual operating conditions, and the maximum temperature T for the transitional season mode can be recalculated. eq The adjusted values ​​are stored in the controller of the air conditioning system, and the determination of the transition season is based on the adjusted values.

[0070] The vehicle monitors the outdoor ambient temperature T in real time while it is in operation. em When the outdoor ambient temperature T em Greater than or equal to the highest temperature T in the transitional season pattern eq When the outdoor ambient temperature T is reached, the system enters summer mode and controls the air conditioning system to execute the cooling setting mode; when the outdoor ambient temperature T is reached... em Less than or equal to the lowest temperature T in the transitional season pattern ed When the outdoor ambient temperature T is reached, the system enters winter mode and controls the air conditioning system to operate in heating mode. em The highest temperature T in the transitional season mode eq and the lowest temperature T in the transitional season pattern ed During this period, the air conditioning system is controlled to operate in transitional season mode.

[0071] In this embodiment, the transitional season mode further includes the following steps:

[0072] S21. Adjust the fresh air volume to the maximum air volume and turn on the fresh air energy-saving mode.

[0073] Further optimization involves adjusting the fresh air volume to the maximum by opening the fresh air valve to its maximum angle. Specifically, when the ambient temperature outside the vehicle is determined to be within the transitional season range, the air conditioning controller controls the fresh air valve to open to its maximum angle.

[0074] S22. Adjust the return air volume and / or the fan frequency accordingly to keep the temperature inside the carriage within the set range.

[0075] A return air vent is provided on the casing of the air conditioning unit. Part of the air in the carriage flows back into the air conditioning unit through the return air vent, and the other part is discharged to the outside of the vehicle through the exhaust vent. In order to adjust the return air volume of the air conditioning unit, a return air valve is installed at the return air vent of the air conditioning unit in this embodiment. In step S22, the return air volume of the air conditioning unit is adjusted by adjusting the opening of the return air valve on the air conditioning unit.

[0076] The optimal opening degree of the return air valve is adjusted according to the following formula (3):

[0077] Return air valve opening degree = total opening degree * m * T ic / (T ic -T in (3)

[0078] In equation (3), T ic Set the temperature inside the carriage, T in The actual temperature inside the carriage is denoted by 'm', which is a variable. The total opening is the maximum opening of the return air valve.

[0079] Preferably, the value of variable m ranges from 0.005 to 0.03. For vehicles operating in specific areas, depending on the vehicle model, variable m is a fixed value and is pre-stored in the controller of the air conditioning system. This variable m is obtained based on a large number of tests and experiences, and the value of variable m meets the usage requirements during vehicle operation. The opening degree of the return air valve is calculated according to formula (3) and then rounded. Of course, variable m can also be adjusted after a period of operation based on the actual operating conditions, and the adjusted value is stored in the controller of the air conditioning system.

[0080] In a further preferred embodiment, in step S22, the frequency of the ventilator is adjusted according to the following formula (4);

[0081] Ventilation fan frequency = rated frequency * variable x (4);

[0082] In equation (4), the rated frequency refers to the operating frequency of the fan under the rated cooling conditions, and the variable x is related to the fresh air volume, which is the offset of the fan frequency during the transition season.

[0083] Preferably, variable x satisfies the fan airflow offset y during the transitional season operation mode, meaning the fan frequency needs to satisfy the increase in fresh air volume y. In other words, when the transitional season airflow offset y is satisfied, the fan frequency is x. The relationship between the two is verified experimentally. Further preferably, the fan airflow offset y ranges from 0% to 300%. For vehicles operating in specific areas, depending on the vehicle model, the values ​​of variable x and airflow offset y are... Fan air volume offset y is a fixed value, pre-stored in the air conditioning system controller. The variables x and y (fan airflow offset y) are obtained based on extensive testing and experience, and their values ​​meet the operational requirements of the vehicle. Of course, x and y can also be adjusted after a period of operation based on actual conditions, and the adjusted values ​​will be stored in the air conditioning system controller.

[0084] The present invention also provides a vehicle air conditioning control device to achieve the energy-saving control method described above, specifically including:

[0085] The acquisition module is used to acquire the current outdoor ambient temperature and determine whether the conditions set for the transitional season are met.

[0086] The control module controls the air conditioning system to execute the transitional season mode when the ambient temperature meets the transitional season setting conditions; and controls the air conditioning system to execute the cooling / heating / ventilation setting mode when the ambient temperature does not meet the transitional season setting conditions.

[0087] The present invention also provides a vehicle air conditioning system, which employs the vehicle air conditioning energy-saving control method and vehicle air conditioning control device described above.

[0088] Based on the characteristics of transitional seasons, this invention determines the temperature of the vehicle's external environment by measuring the transitional season temperature. When the conditions for the transitional season are met, the temperature inside the vehicle is controlled by introducing fresh air with a lower external temperature. This not only achieves energy saving for the vehicle's air conditioning system but also avoids frequent start-stop of the compressor under this condition, thus extending the compressor's lifespan.

[0089] This invention uses reasonable judgment logic to determine the minimum temperature T for the transitional season mode based on the region and model of the vehicle. ed and the highest temperature T in the transitional season pattern eq The range of values ​​fully considers all factors affecting the temperature during the transition season, making the determination logic for the transition season simpler and more accurate. It can also meet the needs of vehicles operating in different regions during the transition season, ensuring the optimal comfort of the cabin environment while achieving energy conservation.

[0090] When the transitional season setting conditions are met and the transitional season mode is to be operated, the present invention adjusts the fresh air volume to the maximum, and further controls the temperature inside the carriage by controlling the return air volume and the frequency of the ventilation fan, which greatly simplifies the control logic of the transitional season mode.

[0091] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. The implementation schemes in the above embodiments can be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A vehicle air conditioning control method characterized by, The method comprises the following steps: S1. Obtain the ambient temperature outside the vehicle, T. em Determine the ambient temperature T em Does it meet the conditions set for the transitional season? S2, when the ambient temperature T em When the transition season setting condition is met, the air conditioning system is controlled to execute a transition season mode, and the transition season mode is to adjust the temperature in the vehicle cabin by using outdoor fresh air. S3, when the ambient temperature T em When the transition season setting condition is not met, the air conditioning system is controlled to execute the cooling / heating / ventilation setting mode. The determination formula of the transitional season setting condition is: T ed <T em <T eq ; In the formula, T em is the ambient temperature; T ed The lowest temperature of the transitional season mode is T ed , which is determined according to the longitude and latitude of the vehicle operation area, the vehicle load and the use habit. T eq For the highest temperature of the transition season mode, the value is calculated by the formula T eq =(K1-K2*K3) / (1-K2), wherein the coefficient K1 is determined according to the lower limit value of the indoor refrigeration set temperature, and the coefficient K1 and the lower limit value of the indoor refrigeration set temperature are in an opposite trend corresponding relationship. The coefficient K2 is a result correction coefficient according to the vehicle operation demand, and the result is corrected according to the use demand of the vehicle in different regions; the coefficient K3 is determined according to the difference between the set temperature in the vehicle and the design working condition outside the vehicle, and the coefficient K3 and the difference have a corresponding relation in opposite trends.

2. The vehicle air conditioning control method according to claim 1, characterized by: In the above equation T eq = (K1-K2*K3) / (1-K2) where 20≤K1≤23, 0.2≤K2≤0.4, 14≤K3≤18.

3. The vehicle air conditioning control method according to claim 1 or 2, characterized by: The transition season mode comprises the following steps: S21, adjusting the fresh air volume to the maximum air volume; S22, adjusting the return air volume and / or the frequency of the ventilator to keep the temperature in the vehicle cabin in the set range.

4. The vehicle air conditioning control method according to claim 3, characterized by: In step S21, the fresh air volume is adjusted to the maximum air volume by opening the fresh air valve to the maximum angle.

5. The vehicle air conditioning control method according to claim 3, characterized by: In step S22, the return air volume is adjusted by adjusting the opening degree of the return air valve, and the opening degree of the return air valve is adjusted according to the following formula: Return air valve opening = total opening * m * T ic / (T ic -T in ); where T ic is the set temperature in the vehicle cabin, T in is the actual temperature in the vehicle cabin, and m is a variable.

6. The vehicle air conditioning control method according to claim 5, characterized by: The value range of the variable m is 0.005-0.

03.

7. The vehicle air conditioning control method according to claim 3, characterized by: In step S22, the frequency of the ventilator is adjusted according to the following formula: Ventilator frequency = rated frequency * variable x; In the formula, the variable x is the offset of the frequency of the ventilator in the transition season.

8. The vehicle air conditioning control method according to claim 7, characterized by: The variable x satisfies the ventilator air volume offset y when the transition season mode is operated, and the value range of the ventilator air volume offset y is 0-300%.

9. A vehicle air-conditioning control device that implements the vehicle air-conditioning control method according to any one of claims 1 to 8, characterized by It comprises: An acquisition module is configured to acquire the current outdoor environment temperature and determine whether the transition season setting condition is met; A control module is configured to control the air conditioning system to execute the transition season mode when the environment temperature meets the transition season setting condition, and control the air conditioning system to execute the refrigeration / heating / ventilation setting mode when the environment temperature does not meet the transition season setting condition.

10. A vehicle air conditioning system characterised in that: The vehicle air conditioning control method according to any one of claims 1-8 is adopted.

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