Intelligent control method and system for internal and external circulation of vehicle air conditioner

Abstract

The invention discloses an intelligent control method and system for internal and external circulation of a vehicle air conditioner, and belongs to the field of vehicle air conditioner control. The method comprises the following steps: S1, collecting vehicle sensor data; s2, calculating the fogging probability of glass in the vehicle according to the vehicle sensor data; s3, when the fogging probability is smaller than or equal to a preset probability threshold value, the relative humidity of air in the vehicle is obtained; when it is detected that the relative humidity of the air in the vehicle is smaller than or equal to a preset humidity threshold value, the air conditioner enters a partial internal circulation mode; and S4, in the partial internal circulation mode, the external environment temperature of the automobile is obtained, and when the external environment temperature of the automobile is smaller than or equal to a preset temperature threshold value, the internal and external circulation proportion of the air conditioner is controlled according to preset calibration data. Through intelligent control over the internal and external circulation proportion of the air conditioner, the power consumption of the whole vehicle is reduced, the endurance is improved, and the air conditioner is suitable for being used in winter.

Description

Technical Field

[0001] The present invention belongs to the field of vehicle air-conditioning control, and in particular, relates to an intelligent control method and system for internal and external circulation of a vehicle air-conditioning. Background Art

[0002] As national automobile emission regulations become increasingly stringent and requirements continue to increase, and the new energy vehicle points system is widely implemented, new energy electric vehicle models and R&D projects are also showing a rapid growth trend, the industry transformation is in-depth, and software-defined cars are moving from theory to practice. With the popularization of new energy electric vehicles, energy consumption and endurance have also become the focus of people in the new energy vehicle field;

[0003] In winter, traditional passenger cars avoid fogging of the windshield, and the air conditioning heating is generated by the engine waste heat circulation, so there is no need to consider energy consumption and endurance issues. The air conditioning internal and external circulation mode is in external circulation mode most of the time to minimize the risk of fogging and ensure driving safety. However, when the air-conditioning system of new energy vehicles is heating, the high-voltage heater needs to work at high power to generate heat. When the winter circulation is in full external circulation mode, the air circulation inside and outside the car is the greatest. In order to balance the temperature inside the car, a larger heating power is required, which leads to increased energy consumption of the whole vehicle and reduced endurance. Summary of the invention

[0004] The present invention aims to overcome the deficiencies of the prior art and proposes an intelligent control method and system for internal and external circulation of a vehicle air conditioner to achieve the following objectives: through intelligent control of the internal and external circulation ratio of the air conditioner, the power consumption of the whole vehicle is reduced and the cruising range is improved.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] An intelligent control method for internal and external circulation of a vehicle air conditioner, the method comprising the following steps:

[0007] S1, collecting vehicle sensor data, wherein the sensor data includes the temperature of the glass itself, the relative humidity and ambient temperature of the air inside the vehicle, and the ambient temperature outside the vehicle;

[0008] S2, calculating the probability of fogging of the glass inside the vehicle according to the vehicle sensor data;

[0009] S3, when the fogging probability is less than or equal to a preset probability threshold, obtaining the relative humidity of the air in the vehicle; when it is detected that the relative humidity of the air in the vehicle is less than or equal to a preset humidity threshold, the air conditioner enters a partial internal circulation mode;

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

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

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

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

[0014] Preferably, the preset probability threshold of 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 air-conditioning internal and external circulation ratio supports user customization.

[0017] Preferably, in step S4, the calibration method of the air-conditioning internal and external circulation ratio is: under the premise that the actual humidity is less than or equal to the preset humidity threshold, when the actual humidity decreases, the internal circulation ratio is increased, and when the actual humidity increases, the external circulation ratio is increased; and when the external ambient temperature of the vehicle is less than or equal to the preset temperature threshold, it is necessary to ensure that the external circulation ratio is always ≥50%.

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

[0019] At the same time, the present application also proposes an intelligent control system for internal and external circulation of a vehicle air conditioner. The system is constructed according to the above-mentioned intelligent control method for internal and external circulation of a vehicle air conditioner, and includes an in-vehicle temperature sensor, an outside temperature sensor, a glass temperature sensor, an in-vehicle humidity sensor, and an air-conditioning controller. The in-vehicle temperature sensor, the outside temperature sensor, the glass temperature sensor, and the in-vehicle humidity sensor are respectively connected to the air-conditioning controller, and the air-conditioning controller is used to perform intelligent control of the internal and external circulation of the air conditioner according to the data of the various sensors.

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

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

[0022] The following is a further detailed description of the specific implementation of the present invention by describing the embodiments with reference to the accompanying drawings, with the purpose of helping 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. In order to make the technical solution of the present invention clearer, the present invention is explained by the following embodiments.

[0023] This embodiment aims to optimize the problem of increased energy consumption of new energy vehicles caused by turning on the air conditioner in winter. For this purpose, an intelligent control method for internal and external circulation of vehicle air conditioners is proposed. Figure 1 As shown, the method comprises the following steps:

[0024] S1, collecting vehicle sensor data, wherein the sensor data includes the temperature of the glass itself, the relative humidity and ambient temperature of the air inside the vehicle, and the ambient temperature outside the vehicle;

[0025] S2, calculating the probability of fogging of the glass inside the vehicle according to the vehicle sensor data;

[0026] S3, when the fogging probability is less than or equal to a preset probability threshold, obtaining the relative humidity of the air in the vehicle; when it is detected that the relative humidity of the air in the vehicle is less than or equal to a preset humidity threshold, the air conditioner enters a partial internal circulation mode;

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

[0028] Specifically, in step S1 of this embodiment, in order to realize the intelligent control of the ratio of the internal and external circulation of the air conditioner, it is necessary to collect various data of the vehicle, including the temperature of the glass itself, the relative humidity and ambient temperature of the air inside the vehicle, the ambient temperature outside the vehicle, etc. Correspondingly, it is necessary to install corresponding sensors on the vehicle for data collection. In the prior art, the above sensors are widely used in new energy vehicles, and only the missing sensors need to be newly installed. Therefore, the existing sensors of the present invention can directly call the corresponding data, thereby reducing the cost. In order to improve the reliability of the sensor data so that the intelligent control of the ratio of the internal and external circulation of the air conditioner of this application is more accurate, this embodiment can pre-process the collected sensor data, and the pre-processing includes using a filtering algorithm to remove the noise in the sensor data. The filtering algorithm includes mean filtering, median filtering, Kalman filtering, etc. (all of which are commonly used by those skilled in the art, and can be flexibly selected according to the actual situation, and this embodiment will not be repeated here).

[0029] In step S2 of the present embodiment, in order to ensure safety during driving and avoid the risk of fogging of the front windshield, the first condition that needs to be met is that there is no risk of fogging in the car, that is, the probability of fogging is 0, and the preset probability threshold is 0, and the actually measured fogging probability is compared with the preset probability threshold. Specifically, the fogging probability is obtained by pre-calibrating the glass's own temperature, the relative humidity of the air in the car, and the ambient temperature. The fundamental factors that determine the fogging of the car's front windshield are the glass's own temperature, the relative humidity of the air that the glass fogging surface contacts, and the ambient temperature. Among them, the dew point temperature is related to the relative humidity and the glass surface temperature. When the air temperature on the glass surface is greater than the dew point temperature, there will be no fogging. If it is less than the dew point temperature, it will fog. Therefore, the calibration relationship between the fogging probability and the dew point temperature can be obtained, which is expressed as follows:

[0030] Fogging probability relationship: F ​​= g(Tdp, Tx);

[0031] Among them, F represents the fogging probability; Tdp represents the dew point temperature; Tx represents the air temperature on the glass surface; g() represents the functional relationship between the fogging probability F and the dew point temperature Tdp and the air temperature on the glass surface Tx. This functional relationship can be obtained through the calibration of big data.

[0032] Dew point temperature Tdp relationship: Tdp = f1 (Tg, HR);

[0033] Among them, Tg represents the temperature of the glass itself; HR represents the relative humidity in the car; f1() represents the functional relationship between the dew point temperature Tdp and the temperature of the glass itself Tg and the relative humidity HR in the car, which can also be obtained through the calibration of big data. In summary, in order to simplify the process, the final fogging probability is only related to the air temperature Tx on the glass surface, the temperature Tg of the glass itself, and the relative humidity HR in the car, so the air temperature Tx on the glass surface, the temperature Tg of the glass itself, and the relative humidity HR in the car can be calibrated directly through big data.

[0034] Based on a feasible embodiment of the present invention, in step S3, when the probability of fogging is greater than a preset probability threshold, the air conditioner enters a dehumidification mode, thereby reducing the probability of fogging by reducing the air humidity in the vehicle (usually, the higher the air humidity, the higher the probability of fogging), and returns to step S1 until the dehumidification mode is turned off after the probability of fogging is less than or equal to the preset probability threshold. Then continue to execute step S3, obtain the relative humidity of the air in the vehicle and compare it with the preset humidity threshold, wherein, when it is detected that the relative humidity of the air in the vehicle is greater than the preset humidity threshold, the air conditioner enters a full external circulation mode to reduce the relative humidity of the air and returns to step S1. At the same time, in order to speed up the reduction of the relative humidity of the air, the dehumidification mode can be turned on again until it is detected that the relative humidity of the air in the vehicle is less than or equal to the preset humidity threshold, and then the dehumidification mode is turned off.

[0035] In the above feasible embodiments, the secondary opening and closing of the air conditioning dehumidification mode will also increase the vehicle power consumption to a certain extent. In order to overcome this problem and further reduce power consumption, in this embodiment, when the probability of fogging is greater than the preset probability threshold, the air conditioner enters the dehumidification mode and returns to the step S1 until the probability of fogging is less than or equal to the preset probability threshold, and then directly obtains the relative humidity of the air in the vehicle. When it is detected that the relative humidity of the air in the vehicle is less than or equal to the preset humidity threshold, the dehumidification mode is turned off, otherwise the dehumidification mode remains on, and dehumidification is performed simultaneously with the air conditioning full external circulation mode to speed up dehumidification. Obviously, in this embodiment, the dehumidification mode is only turned on and off once, which reduces the energy consumption of the whole vehicle and improves the endurance.

[0036] In this embodiment, in order to ensure the comfort level in the car, the preset humidity threshold can be set to 60%, that is, when the humidity in the car is ≤ 60%, the air conditioner enters the partial internal circulation mode. The specific implementation can be flexibly selected according to the actual situation.

[0037] In step S4 of this embodiment, when the ambient temperature outside the vehicle is greater than a preset temperature threshold (set to 0°C in this embodiment, which can be flexibly selected according to actual conditions during implementation), the air conditioning internal and external circulation ratio supports user customization. When the ambient temperature outside the vehicle is less than or equal to the preset temperature threshold, the specific air conditioning internal and external circulation ratio needs to be pre-determined through calibration.

[0038] Specifically, the present application takes into account the characteristics of winter air conditioning use, and specifically calibrates the data of the ratio of internal and external circulation of winter air conditioning to further reduce power consumption. The calibration method of the ratio of internal and external circulation of air conditioning in this embodiment is: under the premise that the actual humidity is less than or equal to the preset humidity threshold (≤60%), when the actual humidity decreases, the ratio of internal circulation is increased, and when the actual humidity increases, the ratio of external circulation is increased, and when the ambient temperature outside the vehicle is less than or equal to the preset temperature threshold (≤0°C), the ratio of external circulation must be ensured to be ≥50% at all times. This is because when the outside temperature is low (≤0°C), the external cold air introduced by the external circulation may reduce the efficiency of the temperature regulation of the air conditioning in the vehicle, thereby requiring the air conditioning to increase its output power, resulting in 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 by pre-calibration is shown in Table 1.

[0040]

[0041] Table 1

[0042] Among them, when 50%<actual humidity≤60%, the external circulation ratio accounts for 90% and the internal circulation ratio accounts for 10%; when 40%<actual humidity≤50%, the external circulation ratio accounts for 65% and the internal circulation ratio accounts for 35%; when 0%<actual humidity≤40%, the internal and external circulation ratios are 50% each. It can be seen that the calibration data of this embodiment conforms to the calibration method, and the control and adjustment of the internal and external circulation ratios of the air conditioner can effectively reduce the power consumption of the whole vehicle and improve the endurance of the whole vehicle.

[0043] At the same time, the present application also proposes an intelligent control system for internal and external circulation of a vehicle air conditioner. The system is constructed according to the above-mentioned intelligent control method for internal and external circulation of a vehicle air conditioner, and includes an in-vehicle temperature sensor, an outside temperature sensor, a glass temperature sensor, an in-vehicle humidity sensor, and an air-conditioning controller. The in-vehicle temperature sensor, the outside temperature sensor, the glass temperature sensor, and the in-vehicle humidity sensor are respectively connected to the air-conditioning controller, and the air-conditioning controller is used to perform intelligent control of the internal and external circulation of the air conditioner according to the data of the various sensors.

[0044] Among them, the air conditioning controller can adopt a vehicle control unit (VCU), an electronic control unit (ECU), a microcontroller (MCU) and other controllers, which can be flexibly selected according to actual conditions during specific implementation. The in-vehicle temperature sensor, the outside temperature sensor, the glass temperature sensor, and the in-vehicle humidity sensor can be connected to the air conditioning controller through the CAN bus, respectively, so as to speed up the information transmission rate and improve the data stability, thereby ensuring the control efficiency. The system structure of the present application is simple, and the components used are all commonly used automotive parts, which are simple to arrange and reduce the cost.

[0045] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An intelligent control method for internal and external circulation of a vehicle air conditioner, characterized in that: The method comprises the following steps: S1, collecting vehicle sensor data, wherein the sensor data includes the temperature of the glass itself, the relative humidity and ambient temperature of the air inside the vehicle, and the ambient temperature outside the vehicle; S2, calculating the probability of fogging of the glass inside the vehicle according to the vehicle sensor data; S3, when the fogging probability is less than or equal to a preset probability threshold, obtaining the relative humidity of the air in the vehicle; when it is detected that the relative humidity of the air in the vehicle is 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, the external environment temperature is obtained. When the external environment temperature is less than or equal to a preset temperature threshold, the internal and external circulation ratio of the air conditioner is controlled according to preset calibration data.

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 temperature of the glass itself, the relative humidity of the air in 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 it is detected that the relative humidity of the air in the vehicle is greater than a preset humidity threshold, the air conditioner enters a 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 or 3, characterized in that: Based on step S3, when the fogging probability is greater than the preset probability threshold, the air conditioner enters the dehumidification mode and returns to step S1 until the fogging probability is less than or equal to the preset probability threshold, and then obtains the relative humidity of the air in the vehicle. When it is detected that the relative humidity of the air in the vehicle is less than or equal to the preset humidity threshold, the dehumidification mode is turned off.

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

6. The intelligent control method for internal and external circulation of a vehicle air conditioner according to claim 4 is characterized in that: The preset humidity threshold is 60%.

7. 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 ambient temperature outside the vehicle is greater than a preset temperature threshold, the air conditioning internal and external circulation ratio supports user customization.

8. The intelligent control method for internal and external circulation of a vehicle air conditioner according to claim 1, characterized in that: In step S4, the calibration method of the air conditioning internal and external circulation ratio is: under the premise that the actual humidity is less than or equal to the preset humidity threshold, when the actual humidity decreases, the internal circulation ratio is increased, and when the actual humidity increases, the external circulation ratio is increased; and when the external ambient temperature of the vehicle is less than or equal to the preset temperature threshold, it is necessary to ensure that the external circulation ratio is always ≥50%.

9. The intelligent control method for internal and external circulation of a vehicle air conditioner according to claim 8, characterized in that: The 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%.

10. An intelligent control system for internal and external circulation of a vehicle air conditioner, characterized in that: The system is constructed according to the intelligent control method for internal and external circulation of a vehicle air conditioner according to any one of claims 1 to 9, and includes an in-vehicle temperature sensor, an outside-vehicle temperature sensor, a glass temperature sensor, an in-vehicle humidity sensor, and an air-conditioning 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-conditioning controller, and the air-conditioning controller is used to perform intelligent control of the internal and external circulation of the air-conditioning according to the data of the various sensors.

Images