A smart control method and system for internal and external air circulation in automotive air conditioning

Abstract

This invention discloses an intelligent control method and system for the internal and external circulation of an automotive air conditioner, belonging to the field of vehicle air conditioning control. The method includes the following steps: S1, collecting vehicle sensor data; S2, calculating the probability of fogging of the interior glass based on the vehicle sensor data; S3, when the fogging probability is less than or equal to a preset probability threshold, acquiring the relative humidity of the interior air; when the relative humidity of the interior air is detected to be less than or equal to a preset humidity threshold, the air conditioner enters a partial internal circulation mode; S4, in the partial internal circulation mode, acquiring the outside ambient temperature; when the outside ambient temperature is less than or equal to a preset temperature threshold, controlling the ratio of internal and external air circulation based on preset calibration data. This invention reduces overall vehicle power consumption and improves range through intelligent control of the internal and external air circulation ratio, making it suitable for use in winter.

Description

Technical Field

[0001] This invention belongs to the field of vehicle air conditioning control. Specifically, this invention relates to an intelligent control method and system for the internal and external circulation of a vehicle air conditioner. Background Technology

[0002] As national vehicle emission regulations become increasingly stringent and requirements continue to rise, coupled with the widespread implementation of the new energy vehicle credit system, new energy electric vehicle models and R&D projects are experiencing rapid growth. Industry transformation is deepening, and software-defined vehicles are moving from theory to practice. With the increasing popularity of new energy electric vehicles, energy consumption and range have become the most pressing concerns in the new energy vehicle sector.

[0003] In winter, traditional passenger vehicles use external air circulation mode for most of the time to minimize the risk of fogging and ensure driving safety, as the air conditioning system generates heat from the engine's waste heat and does not require consideration of energy consumption or range. However, in new energy vehicles, the air conditioning system requires a high-pressure heater to operate at high power to generate heat. When the air circulation is in full external circulation mode in winter, the air flow between the inside and outside of the vehicle is at its maximum. To balance the temperature inside the vehicle, a greater amount of heat is required, which leads to increased energy consumption and reduced range. Summary of the Invention

[0004] This invention aims to overcome the shortcomings of the prior art and proposes an intelligent control method and system for the internal and external circulation of vehicle air conditioning, so as to achieve the following objectives: reduce the power consumption of the whole vehicle and improve the driving range through intelligent control of the ratio of internal and external air circulation.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A smart control method for the internal and external circulation of an automotive air conditioner, the method comprising the following steps:

[0007] S1. Collect vehicle sensor data, including glass temperature, relative humidity and ambient temperature inside the vehicle, and ambient temperature outside the vehicle.

[0008] S2. Calculate the probability of fogging of the interior glass based on the vehicle sensor data;

[0009] S3. When the fogging probability is less than or equal to a preset probability threshold, the relative humidity of the air inside the vehicle is obtained; when the relative humidity of the air inside the vehicle is detected to be less than or equal to a preset humidity threshold, the air conditioner enters a partial recirculation mode.

[0010] S4. In the partial internal circulation mode, the outside ambient temperature is obtained. When the outside ambient temperature is less than or equal to a preset temperature threshold, the ratio of internal and external air circulation of the air conditioner is controlled according to the preset calibration data.

[0011] Preferably, in step S2, the fogging probability is obtained by pre-calibrating the glass temperature, the relative humidity of the air inside the vehicle, and the ambient temperature.

[0012] Preferably, in step S3, when the relative humidity of the air inside the vehicle is detected to be greater than a preset humidity threshold, the air conditioner enters the full external circulation mode and returns to step S1.

[0013] Preferably, based on step S3, when the fogging probability is greater than a preset probability threshold, the air conditioner enters dehumidification mode and returns to step S1 until the fogging probability is less than or equal to the preset probability threshold. Then, the relative humidity of the air inside the vehicle is obtained. When the relative humidity of the air inside the vehicle is detected to be less than or equal to the preset humidity threshold, the dehumidification mode is turned off.

[0014] Preferably, the preset probability threshold for the fogging probability is 0.

[0015] Preferably, the preset humidity threshold is 60%.

[0016] Preferably, in step S4, when the ambient temperature outside the vehicle is greater than a preset temperature threshold, the ratio of internal and external air circulation of the air conditioner can be customized by the user.

[0017] Preferably, in step S4, the calibration method for the air conditioning internal and external circulation ratio is as follows: when the actual humidity is less than or equal to a preset humidity threshold, the internal circulation ratio is increased when the actual humidity decreases, and the external circulation ratio is increased when the actual humidity increases. Furthermore, when the ambient temperature outside the vehicle is less than or equal to a preset temperature threshold, the external circulation ratio must always be ≥50%.

[0018] Preferred, preset calibration data are as follows: when 50% < actual humidity ≤ 60%, the external circulation ratio is 90%; when 40% < actual humidity ≤ 50%, the external circulation ratio is 65%; when 0% < actual humidity ≤ 40%, the external circulation ratio is 50%.

[0019] Meanwhile, this application also proposes an intelligent control system for the internal and external circulation of a vehicle air conditioner. The system is constructed based on the aforementioned intelligent control method for the internal and external circulation of a vehicle air conditioner, and includes an in-vehicle temperature sensor, an outside-vehicle temperature sensor, a glass temperature sensor, an in-vehicle humidity sensor, and an air conditioner controller. The in-vehicle temperature sensor, the outside-vehicle temperature sensor, the glass temperature sensor, and the in-vehicle humidity sensor are respectively connected to the air conditioner controller, and the air conditioner controller is used to perform intelligent control of the internal and external circulation of the air conditioner based on the data from each sensor.

[0020] The technical effects of this invention are as follows: (1) This application reduces the power consumption of the entire vehicle and improves the driving range by intelligently controlling the ratio of internal and external air circulation. (2) While reducing power consumption, in order to ensure driving safety, this application also sets a prerequisite for internal and external air circulation, namely, the probability of fogging is 0. (3) This application takes into account the characteristics of air conditioning use in winter and specifically calibrates the data of the ratio of internal and external air circulation in winter, further reducing power consumption. (4) The system structure of this application is simple, and the components used are all commonly used automotive parts, which are easy to install and reduce costs. Attached Figure Description

[0021] Figure 1 This is a flowchart of an intelligent control method for internal and external air circulation in a vehicle air conditioner according to an embodiment of the present invention. Detailed Implementation

[0022] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. The purpose is to help those skilled in the art to have a more complete, accurate, and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation. To make the technical solution of the present invention clearer, the present invention will be explained and illustrated through the following embodiments.

[0023] This embodiment aims to optimize the problem of increased energy consumption in new energy vehicles during winter due to air conditioning use. To this end, it proposes an intelligent control method for the internal and external circulation of the vehicle's air conditioning system, such as... Figure 1 As shown, the method includes the following steps:

[0024] S1. Collect vehicle sensor data, including glass temperature, relative humidity and ambient temperature inside the vehicle, and ambient temperature outside the vehicle.

[0025] S2. Calculate the probability of fogging of the interior glass based on the vehicle sensor data;

[0026] S3. When the fogging probability is less than or equal to a preset probability threshold, the relative humidity of the air inside the vehicle is obtained; when the relative humidity of the air inside the vehicle is detected to be less than or equal to a preset humidity threshold, the air conditioner enters a partial recirculation mode.

[0027] S4. In the partial internal circulation mode, the outside ambient temperature is obtained. When the outside ambient temperature is less than or equal to a preset temperature threshold, the ratio of internal and external air circulation of the air conditioner is controlled according to the preset calibration data.

[0028] Specifically, in step S1 of this embodiment, to achieve intelligent control of the air conditioning internal and external circulation ratio, it is necessary to collect various vehicle data, including the temperature of the glass itself, the relative humidity and ambient temperature inside the vehicle, and the ambient temperature outside the vehicle. Correspondingly, corresponding sensors need to be installed on the vehicle for data collection. In the prior art, the aforementioned sensors are widely used in new energy vehicles, and only the missing sensors need to be installed. Therefore, the present invention can directly call the corresponding data of existing sensors, thereby reducing costs. To improve the reliability of sensor data so that the intelligent control of the air conditioning internal and external circulation ratio of this application is more accurate, this embodiment can preprocess the collected sensor data. The preprocessing includes using filtering algorithms to remove noise from the sensor data. Filtering algorithms include mean filtering, median filtering, Kalman filtering, etc. (all of which are common methods used by those skilled in the art, and can be flexibly selected according to the actual situation, which will not be described in detail in this embodiment).

[0029] In step S2 of this embodiment, to ensure driving safety and avoid the risk of fogging on the windshield, the first condition to be met is that there is no risk of fogging inside the vehicle, i.e., the probability of fogging is 0. A preset probability threshold of 0 is used, and the actual measured fogging probability is compared with this preset probability threshold. Specifically, the fogging probability is obtained by pre-calibrating the glass's own temperature, the relative humidity of the air inside the vehicle, and the ambient temperature. The fundamental factors determining windshield fogging are the glass's own temperature, the relative humidity of the air in contact with the fogging surface, and the ambient temperature. The dew point temperature is related to the relative humidity and the glass surface temperature. When the air temperature on the glass surface is higher than the dew point temperature, fogging will not occur; if it is lower than the dew point temperature, fogging will occur. Therefore, the calibration relationship between the fogging probability and the dew point temperature can be obtained, expressed as follows:

[0030] The probability formula for fog formation is: F = g(Tdp, Tx);

[0031] Where F represents the probability of fogging; Tdp represents the dew point temperature; Tx represents the air temperature at the glass surface; g() represents the functional relationship between the probability of fogging F and the dew point temperature Tdp and the air temperature at the glass surface Tx, which can be obtained through the calibration of large data.

[0032] The relationship between dew point temperature Tdp is: Tdp = f1(Tg, HR);

[0033] Where Tg represents the temperature of the glass itself; HR represents the relative humidity inside the vehicle; f1() represents the functional relationship between the dew point temperature Tdp, the temperature of the glass itself Tg, and the relative humidity inside the vehicle HR, which can also be obtained through big data calibration. In summary, to simplify the process, the final probability of fogging is only related to the air temperature Tx on the glass surface, the temperature of the glass itself Tg, and the relative humidity inside the vehicle HR. Therefore, it is sufficient to directly calibrate the air temperature Tx on the glass surface, the temperature of the glass itself Tg, and the relative humidity inside the vehicle HR through big data.

[0034] In a feasible embodiment of the present invention, in step S3, when the fogging probability is greater than a preset probability threshold, the air conditioner enters dehumidification mode to reduce the fogging probability by lowering the humidity inside the vehicle (generally, the higher the humidity, the higher the fogging probability), and returns to step S1 until the fogging probability is less than or equal to the preset probability threshold, at which point the dehumidification mode is turned off. Then, step S3 is continued to execute, the relative humidity inside the vehicle is obtained and compared with a preset humidity threshold, wherein, when the relative humidity inside the vehicle is detected to be greater than the preset humidity threshold, the air conditioner enters full external circulation mode to reduce the relative humidity and returns to step S1. At the same time, to accelerate the reduction of relative humidity, the dehumidification mode can also be turned on again until the relative humidity inside the vehicle is detected to be less than or equal to the preset humidity threshold, at which point the dehumidification mode is turned off.

[0035] In the above feasible embodiments, the repeated activation and deactivation of the air conditioning dehumidification mode can increase vehicle power consumption to some extent. To overcome this problem and further reduce power consumption, in this embodiment, when the fogging probability is greater than a preset probability threshold, the air conditioning enters dehumidification mode and returns to step S1 until the fogging probability is less than or equal to the preset probability threshold. Then, the relative humidity of the air inside the vehicle is directly acquired. When the relative humidity of the air inside the vehicle is detected to be less than or equal to a preset humidity threshold, the dehumidification mode is deactivated; otherwise, the dehumidification mode remains active, dehumidifying simultaneously with the air conditioning's full external circulation mode to accelerate dehumidification. Clearly, this embodiment only involves one activation and deactivation of the dehumidification mode, reducing overall vehicle energy consumption and improving range.

[0036] In this embodiment, to ensure comfort inside the vehicle, the preset humidity threshold can be set to 60%, meaning that when the humidity inside the vehicle is ≤60%, the air conditioner enters a partial recirculation mode. In specific implementations, this can be flexibly selected according to actual conditions.

[0037] In step S4 of this embodiment, when the outside ambient temperature is greater than a preset temperature threshold (set to 0°C in this embodiment, but can be flexibly selected according to actual conditions in specific implementation), the air conditioning internal / external circulation ratio can be customized by the user. When the outside ambient temperature is less than or equal to the preset temperature threshold, the specific air conditioning internal / external circulation ratio needs to be predetermined through calibration.

[0038] Specifically, this application takes into account the characteristics of air conditioning use in winter and specifically calibrates the data for the ratio of internal and external air circulation in winter to further reduce power consumption. The calibration method for the ratio of internal and external air circulation in this embodiment is as follows: under the premise that the actual humidity is less than or equal to a preset humidity threshold (≤60%), when the actual humidity decreases, the internal circulation ratio is increased, and when the actual humidity increases, the external circulation ratio is increased. Furthermore, when the ambient temperature outside the vehicle is less than or equal to a preset temperature threshold (≤0℃), the external circulation ratio must always be ≥50%. This is because when the outside temperature is low (≤0℃), the cold air introduced by the external circulation may reduce the efficiency of the air conditioning temperature regulation inside the vehicle, thereby requiring the air conditioning to increase its output power and leading to increased energy consumption.

[0039] In this embodiment, when the fogging probability F = 0 and the ambient temperature is below 0°C, the preset calibration data obtained through pre-calibration is shown in Table 1.

[0040]

[0041] Table 1

[0042] Specifically, when 50% < actual humidity ≤ 60%, the external circulation ratio is 90% and the internal circulation ratio is 10%; when 40% < actual humidity ≤ 50%, the external circulation ratio is 65% and the internal circulation ratio is 35%; when 0% < actual humidity ≤ 40%, the internal and external circulation ratios are each 50%. Therefore, the calibration data in this embodiment conforms to the calibration method described above. Using this to control and adjust the ratio of internal and external air circulation in the air conditioning system can effectively reduce vehicle power consumption and improve vehicle range.

[0043] Meanwhile, this application also proposes an intelligent control system for the internal and external circulation of a vehicle air conditioner. The system is constructed based on the aforementioned intelligent control method for the internal and external circulation of a vehicle air conditioner, and includes an in-vehicle temperature sensor, an outside-vehicle temperature sensor, a glass temperature sensor, an in-vehicle humidity sensor, and an air conditioner controller. The in-vehicle temperature sensor, the outside-vehicle temperature sensor, the glass temperature sensor, and the in-vehicle humidity sensor are respectively connected to the air conditioner controller, and the air conditioner controller is used to perform intelligent control of the internal and external circulation of the air conditioner based on the data from each sensor.

[0044] The air conditioning controller can be a vehicle control unit (VCU), electronic control unit (ECU), microcontroller (MCU), or other similar controllers, and the appropriate choice can be made based on the specific implementation requirements. The in-vehicle temperature sensor, outside temperature sensor, glass temperature sensor, and in-vehicle humidity sensor can be connected to the air conditioning controller via a CAN bus, thereby accelerating information transmission and improving data stability, thus ensuring control efficiency. The system structure of this application is simple, using common automotive components, simplifying deployment and reducing costs.

[0045] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A smart control method for the internal and external circulation of a vehicle air conditioner, characterized in that: The method includes the following steps: S1. Collect vehicle sensor data, including glass temperature, relative humidity and ambient temperature inside the vehicle, and ambient temperature outside the vehicle. S2. Calculate the probability of fogging of the interior glass based on the vehicle sensor data; S3. When the fogging probability is less than or equal to a preset probability threshold, the relative humidity of the air inside the vehicle is obtained; when the relative humidity of the air inside the vehicle is detected to be less than or equal to a preset humidity threshold, the air conditioner enters a partial recirculation mode. S4. In the partial recirculation mode, the outside ambient temperature is acquired. When the outside ambient temperature is less than or equal to a preset temperature threshold, the air conditioning internal and external circulation ratio is controlled according to preset calibration data. In step S4, the calibration method for the air conditioning internal and external circulation ratio is as follows: under the premise that the relative humidity of the air inside the vehicle is less than or equal to a preset humidity threshold, when the relative humidity of the air inside the vehicle decreases, the internal circulation ratio is increased; when the relative humidity of the air inside the vehicle increases, the external circulation ratio is increased. And when the outside ambient temperature is less than or equal to the preset temperature threshold, the external circulation ratio must always be ≥50%. When the probability of fogging is greater than a preset probability threshold, the air conditioner enters dehumidification mode and returns to step S1. This continues until the probability of fogging is less than or equal to the preset probability threshold. Then, the relative humidity of the air inside the vehicle is directly obtained. When the relative humidity of the air inside the vehicle is detected to be less than or equal to the preset humidity threshold, the dehumidification mode is turned off. Otherwise, the dehumidification mode remains on and dehumidifies simultaneously with the air conditioner's full external circulation mode to accelerate dehumidification.

2. The intelligent control method for internal and external circulation of a vehicle air conditioner according to claim 1, characterized in that: In step S2, the fogging probability is obtained by pre-calibrating the glass temperature, the relative humidity of the air inside the vehicle, and the ambient temperature.

3. The intelligent control method for internal and external circulation of a vehicle air conditioner according to claim 1, characterized in that: In step S3, when the relative humidity of the air inside the vehicle is detected to be greater than a preset humidity threshold, the air conditioner enters the full external circulation mode and returns to step S1.

4. The intelligent control method for internal and external circulation of a vehicle air conditioner according to claim 1, characterized in that: The preset probability threshold for the fogging probability is 0.

5. The intelligent control method for internal and external circulation of a vehicle air conditioner according to claim 1, characterized in that: The preset humidity threshold is 60%.

6. The intelligent control method for internal and external circulation of a vehicle air conditioner according to claim 1, characterized in that: In step S4, when the outside temperature is greater than a preset temperature threshold, the air conditioning internal and external circulation ratio can be customized by the user.

7. The intelligent control method for internal and external circulation of a vehicle air conditioner according to claim 1, characterized in that: The preset calibration data are as follows: when 50% < relative humidity inside the vehicle ≤ 60%, the external air circulation ratio is 90%; when 40% < relative humidity inside the vehicle ≤ 50%, the external air circulation ratio is 65%; when 0% < relative humidity inside the vehicle ≤ 40%, the external air circulation ratio is 50%.

8. An intelligent control system for the internal and external circulation of a vehicle air conditioner, characterized in that: The system is constructed according to any one of claims 1-7 of an intelligent control method for the internal and external circulation of a vehicle air conditioner, including an in-vehicle temperature sensor, an outside-vehicle temperature sensor, a glass temperature sensor, an in-vehicle humidity sensor, and an air conditioner controller, wherein the in-vehicle temperature sensor, the outside-vehicle temperature sensor, the glass temperature sensor, and the in-vehicle humidity sensor are respectively connected to the air conditioner controller, and the air conditioner controller is used to perform intelligent control of the internal and external circulation of the air conditioner based on the data of each sensor.

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