Electric vehicle air conditioner energy-saving control method, control system and storage medium

Abstract

The present application relates to the technical field of automobile air conditioner control, and particularly refers to an energy-saving control method, a control system and a storage medium for an electric automobile air conditioner. The method comprises the following steps: S1, calculating the temperature of the inner side of the front windshield glass based on the temperature inside the vehicle and the temperature outside the vehicle; S2, calculating the dew point temperature of the air inside the vehicle based on the temperature inside the vehicle and the relative humidity inside the vehicle; S3, calculating the fogging margin based on the temperature of the inner side of the front windshield glass and the dew point temperature of the air inside the vehicle; S4, calculating the first internal air mixing rate based on the fogging margin; S5, calculating the second internal air mixing rate according to the number of people inside the vehicle; and S6, determining the third internal air mixing rate based on the first internal air mixing rate and the second internal air mixing rate, and controlling the automobile air conditioner according to the third internal air mixing rate. The electric automobile can improve the energy-saving effect of the electric automobile by controlling the ratio of internal and external circulation, while ensuring that the front windshield glass does not fog, and meeting the fresh air demand of the passengers inside the vehicle.

Description

Technical Field

[0001] This invention relates to the field of automotive air conditioning control technology, specifically to an energy-saving control method, control system, and storage medium for electric vehicle air conditioning. Background Technology

[0002] Regardless of their system architecture, electric vehicle air conditioning systems consume battery power for both cooling and heating, increasing battery power consumption and accelerating the reduction of driving range. Of this power consumption, the energy consumption from fresh air intake is particularly significant. Currently, the industry commonly employs a traditional strategy prioritizing external air circulation, using it for heating in winter. However, due to the large temperature difference between the inside and outside of the vehicle, in addition to increased heat exchange within the vehicle body, the energy consumption from fresh air intake also increases significantly, accounting for up to 50%. From an energy-saving perspective, increasing the proportion of internal air intake is significantly more effective, applicable to both cooling and heating conditions, and has less impact on marketability, shortening response time. However, it also increases the risk of fogging and oxygen deficiency inside the vehicle.

[0003] To address the aforementioned technical problems, a Chinese invention patent (CN113682104A) entitled "An Air Conditioning Control Method, Control Device, and Control System" describes a control method. This method uses the difference between the windshield temperature and the dew point temperature as the temperature difference to determine the airflow. It acquires three unconnected temperature difference intervals under the vehicle's environmental conditions. The lower values ​​of two adjacent temperature difference intervals constitute a fogging risk interval, and intervals less than or equal to the lower value of the third temperature difference interval are also considered fogging risk intervals. Based on the fogging risk interval where the initial temperature difference value is located, the corresponding circulation mode and airflow mode are selected. When the temperature difference decreases to the higher value of any fogging risk interval, the circulation mode and airflow mode corresponding to that fogging risk interval are switched. When the temperature difference increases from the lower value to the higher value of any temperature difference interval, the circulation mode and airflow mode corresponding to the fogging risk interval containing that higher value are switched. This method can prevent fogging inside the vehicle and effectively reduce air conditioning energy consumption. However, this solution still has some problems. The main problem is that the solution is based on the fogging of the car windows as a benchmark, which only meets the minimum setting for the car windows not to fog up under normal driving conditions. In reality, electric vehicles also need to consider the normal needs of the people in the car, and need to take into account both the fogging of the windows and the need for fresh air inside the car. However, the solution does not take this problem into account. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the above-mentioned background technology and provide an energy-saving control method, control system and storage medium for electric vehicle air conditioning.

[0005] The technical solution of this invention is: an energy-saving control method for electric vehicle air conditioning, which is carried out according to the following steps:

[0006] S1. Calculate the temperature inside the windshield based on the interior and exterior temperatures;

[0007] S2. Calculate the dew point temperature of the air inside the vehicle based on the vehicle interior temperature and relative humidity.

[0008] S3. Calculate the fogging margin based on the temperature inside the windshield and the dew point temperature of the air inside the vehicle;

[0009] S4. Calculate the first internal air mixing rate based on the fogging margin;

[0010] S5. Calculate the second internal air mixing rate based on the number of people in the vehicle;

[0011] S6. Determine the third air mixing rate based on the first air mixing rate and the second air mixing rate, and control the vehicle air conditioning according to the third air mixing rate.

[0012] According to the energy-saving control method for air conditioning in an electric vehicle provided in this application, the method for calculating the temperature inside the windshield in step S1 includes:

[0013] Calculate the temperature inside the windshield using the following formula.

[0014]

[0015] Wherein: T wsr —Temperature of the inside of the windshield;

[0016] K—Heat transfer coefficient of the windshield;

[0017] T am —Outside temperature;

[0018] T r —Interior temperature;

[0019] α1—Heat transfer coefficient of the inner surface of the windshield;

[0020] C sun —Sunlight compensation temperature.

[0021] According to the energy-saving control method for an electric vehicle air conditioner provided in this application, step S3, the method for calculating the fogging margin includes: calculating the fogging margin according to the following formula.

[0022] FM raw =T wsr -T dew

[0023] Among them: FM raw —Fog margin;

[0024] T wsr—Temperature of the inside of the windshield;

[0025] T dew — Dew point temperature of the air inside the vehicle.

[0026] According to the energy-saving control method for an electric vehicle air conditioning provided in this application, the method for calculating the first internal air mixing rate in step S4 includes:

[0027] The fogging margin is divided into multiple heating ranges and multiple cooling ranges. Each heating range corresponds to an internal circulation air mixing rate, and each cooling range corresponds to an internal circulation air mixing rate.

[0028] Determine whether the current control cycle is the first control cycle of the electric vehicle. If it is the first control cycle, take the internal air mixing rate corresponding to the cooling range where the fogging margin of the current control cycle is located as the first internal air mixing rate of the current control cycle.

[0029] If it is not in the first control cycle, the fogging margin of the current control cycle is compared with the fogging margin of the previous control cycle. When the fogging margin of the current control cycle is not less than the fogging margin of the previous control cycle, the internal circulation air mixing rate corresponding to the heating range where the fogging margin of the current control cycle is located is taken as the first internal air mixing rate of the current control cycle. When the fogging margin of the current control cycle is less than the fogging margin of the previous control cycle, the internal circulation air mixing rate corresponding to the cooling range where the fogging margin of the current control cycle is located is taken as the first internal air mixing rate of the current control cycle.

[0030] According to the energy-saving control method for an electric vehicle air conditioning system provided in this application, the method of dividing the fogging margin into multiple temperature rise intervals, each temperature rise interval corresponding to an internal circulation air mixing rate, includes: dividing the fogging margin according to the following method.

[0031] Set (-∞, -3) as the first heating range, and the internal circulation air mixing rate corresponding to the first heating range is 0;

[0032] The second heating range is set to [-3, -1), and the internal air mixing rate corresponding to the second heating range is 20%.

[0033] The third heating range is defined as [-1, 1), and the internal air mixing rate corresponding to the third heating range is 40%.

[0034] [1, 3) is set as the fourth heating zone, and the internal circulation air mixing rate corresponding to the fourth heating zone is 60%;

[0035] [3, 5) is set as the fifth heating zone, and the internal circulation air mixing rate corresponding to the fifth heating zone is 80%;

[0036] The range [5, +∞) is set as the sixth heating range, and the internal air mixing rate corresponding to the sixth heating range is 100%.

[0037] According to the energy-saving control method for electric vehicle air conditioning provided in this application, the method of dividing the fogging margin into multiple cooling zones, each cooling zone corresponding to an internal recirculation air mixing rate, includes: dividing the fogging margin according to the following method.

[0038] Set (-∞, -4) as the first cooling range, and the internal air mixing rate corresponding to the first cooling range is 0;

[0039] The second cooling zone is defined as [-4, -2), and the internal air mixing rate corresponding to the second cooling zone is 20%.

[0040] The third cooling zone is set to [-2, 0), and the internal air mixing rate corresponding to the third cooling zone is 40%.

[0041] The fourth cooling zone is defined as [0, 2), and the internal air mixing rate corresponding to the fourth cooling zone is 60%.

[0042] [2, 4) is set as the fifth cooling zone, and the internal air mixing rate corresponding to the fifth cooling zone is 80%.

[0043] The sixth cooling zone is defined as [4, +∞), and the internal air mixing rate corresponding to the sixth cooling zone is 100%.

[0044] According to the energy-saving control method for an electric vehicle air conditioning provided in this application, step S5, the method for calculating the second interior air mixing rate includes: calculating the second interior air mixing rate according to the following formula.

[0045]

[0046] Among them: RFD frs —Second internal air mixing rate;

[0047] a — The amount of fresh air required per passenger;

[0048] n — the current number of passengers in the vehicle;

[0049] V – Current fan speed setting and airflow volume of the air conditioner under the current fan speed mode.

[0050] According to the energy-saving control method for air conditioning of an electric vehicle provided in this application, in step S6, the method for determining the third internal air mixing rate based on the first internal air mixing rate and the second internal air mixing rate includes: selecting the smaller value between the first internal air mixing rate and the second internal air mixing rate as the third internal air mixing rate.

[0051] This application also provides an energy-saving control system for an electric vehicle air conditioning system, wherein the control system operates according to the aforementioned energy-saving control method for an electric vehicle air conditioning system, including...

[0052] A temperature acquisition module, which is used to acquire the interior temperature and the exterior temperature of the vehicle;

[0053] A humidity acquisition module, which is used to collect the relative humidity inside the vehicle;

[0054] A fogging margin calculation module calculates the fogging margin based on the vehicle interior temperature, vehicle exterior temperature, and vehicle interior relative humidity.

[0055] The first internal air mixing rate calculation module calculates the first internal air mixing rate based on the fogging margin.

[0056] The second interior air mixing rate calculation module calculates the second interior air mixing rate based on the number of people in the vehicle.

[0057] The third internal air mixing rate calculation module calculates the third internal air mixing rate based on the first internal air mixing rate calculation module and the second internal air mixing rate calculation module.

[0058] This application also provides a computer-readable storage medium storing a program that can be loaded and executed by a processor to implement the above-described energy-saving control method for an electric vehicle air conditioning system.

[0059] The advantages of this application are: 1. This application provides energy-saving control for the air conditioning of electric vehicles. In addition to considering the fogging inside the vehicle, this application also considers the needs of the occupants. By combining the fogging and fresh air needs, it seeks the optimal ratio of internal and external air circulation to ensure that the requirement of preventing fogging of the interior glass is met while also meeting the fresh air needs of the occupants. This achieves the goal of energy saving and providing the most comfortable driving experience, and has great promotional value.

[0060] 2. The method of calculating the inner temperature of the windshield in this application is very simple. It is obtained indirectly through the outside temperature and the inside temperature of the vehicle. There is no need to add a new temperature sensor. The required inner temperature of the windshield can be obtained by using the temperature sensor built into the vehicle itself. The calculation is accurate and convenient.

[0061] 3. The method for calculating the fogging margin in this application is very simple. The current fogging margin inside the vehicle can be accurately obtained by using the temperature inside the windshield and the dew point temperature of the air inside the vehicle. This provides a good basis for the subsequent calculation of the air-fuel mixture rate. The calculation of the fogging margin can accurately reflect the current fogging situation inside the vehicle and ensure that the final calculation result meets the requirement that the windshield does not fog up.

[0062] 4. The method for calculating the first internal air mixing rate in this application is very simple. By dividing the fogging margin into a heating range and a cooling range, and then substituting the calculated fogging margin into the specific range, the internal air mixing rate corresponding to that range can be obtained. The calculation method is simple and efficient.

[0063] 5. The division of the heating range in this application is very simple. The heating range is a stepped structure, which is simple and clear. It is convenient to quickly obtain the corresponding first internal air mixing rate when the fogging margin corresponds to the heating range, and the overall calculation is convenient.

[0064] 6. The division of the cooling range in this application is very simple. The cooling range has a stepped structure, which is simple and clear. It is convenient to quickly obtain the corresponding first internal air mixing rate when the fogging margin corresponds to the cooling range, and the overall calculation is convenient.

[0065] 7. The calculation of the second interior air mixing rate in this application is extremely simple. The fresh air volume required to meet the current occupants can be obtained by the number of occupants in the vehicle. Based on the required fresh air volume and the current air conditioning output volume, the required second interior air mixing rate can be obtained. The second interior air mixing rate meets the fresh air needs of the current occupants in the vehicle, providing a more comfortable air environment for the occupants in the vehicle.

[0066] 8. The calculation method of the third interior air mixing rate in this application is simple. By selecting the smaller value between the first and second interior air mixing rates as the third interior air mixing rate, the most suitable balance can be found among energy saving, fogging and fresh air demand, which facilitates the control of automotive air conditioning.

[0067] 9. This application also provides a control system that facilitates the construction of a complete air conditioning energy-saving control program in an electric vehicle. Based on this control system, the air conditioning of the electric vehicle can be effectively controlled to ensure that the air conditioning of the electric vehicle can achieve the best balance in terms of energy saving, defogging and fresh air demand.

[0068] 10. This application also provides a storage medium containing a program for implementing the above control method.

[0069] The energy-saving control method for electric vehicle air conditioning proposed in this application is simple. By controlling the ratio of internal and external air circulation, the energy-saving effect of electric vehicles can be improved, while ensuring that the windshield does not fog up and meeting the fresh air needs of the occupants. It has great promotional value. Attached Figure Description

[0070] Figure 1 : A schematic diagram of the control method of this application;

[0071] Figure 2 The diagram showing the correspondence between fogging margin and internal air mixing rate in this application. Detailed Implementation

[0072] Embodiments of the present invention are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0073] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "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 limitations on this invention.

[0074] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0075] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0076] This application relates to an energy-saving control method for an electric vehicle air conditioner, specifically for controlling the ratio of internal and external air circulation in the vehicle's air conditioner. By controlling the ratio of internal and external air circulation in the electric vehicle's air conditioner, energy saving is achieved. At the same time, this application comprehensively considers the fogging of the windshield and the fresh air demand of the occupants in the vehicle. That is, the control method of this application meets the three requirements of energy saving, windshield defogging, and fresh air demand.

[0077] Specifically, such as Figure 1 As shown, this application is carried out according to the following steps:

[0078] S1. Calculate the temperature inside the windshield based on the interior and exterior temperatures;

[0079] S2. Calculate the dew point temperature of the air inside the vehicle based on the vehicle interior temperature and relative humidity.

[0080] S3. Calculate the fogging margin based on the temperature inside the windshield and the dew point temperature of the air inside the vehicle;

[0081] S4. Calculate the first internal air mixing rate based on the fogging margin;

[0082] S5. Calculate the second internal air mixing rate based on the number of people in the vehicle;

[0083] S6. Determine the third air mixing rate based on the first air mixing rate and the second air mixing rate, and control the vehicle air conditioning according to the third air mixing rate.

[0084] The calculation of the first internal air mixing rate takes into account the problem of windshield fogging, and the calculation of the second internal air mixing rate takes into account the fresh air demand of the occupants. The combination of the first and second internal air mixing rates yields the third internal air mixing rate, which satisfies both windshield defogging and the needs of the occupants. By combining internal and external air circulation, energy saving can be achieved.

[0085] In some embodiments of this application, step S1 described above has been optimized. Specifically, the method for calculating the temperature inside the windshield includes:

[0086] Calculate the temperature inside the windshield using the following formula.

[0087]

[0088] Wherein: T wsr —Temperature of the inside of the windshield, °C;

[0089] K – Heat transfer coefficient of the windshield, W / m 2 *k;

[0090] T am —Outside temperature, °C;

[0091] T r —Interior temperature, °C;

[0092] α1—Heat transfer coefficient of the inner surface of the windshield, W / m 2 *k;

[0093] C sun —Sunlight compensation temperature, °C.

[0094] Outside temperature T am and the temperature inside the car (T) r The temperature can be obtained separately through the outside temperature sensor and the inside temperature sensor, which are integrated into the electric vehicle itself. The heat transfer coefficient K of the windshield can be calculated using the following formula:

[0095]

[0096] Where: K—heat transfer coefficient of the windshield, W / m 2 *k;

[0097] α0 — Heat transfer coefficient of the outer surface of the windshield, W / m 2 *k, related to vehicle speed;

[0098] α1—Heat transfer coefficient of the inner surface of the windshield, W / m 2 *k is related to the average air velocity inside the vehicle;

[0099] λ—Thermal conductivity of the windshield, W / m*k, is related to the glass material and can be obtained from a table;

[0100] δ—Windshield thickness, in meters;

[0101] The heat transfer coefficient α0 of the outer surface of the windshield and the heat transfer coefficient α1 of the inner surface of the windshield can be calculated using the following formula:

[0102] α0 = 3.79 × V sp 0.8

[0103] Where: α0—heat transfer coefficient of the outer surface of the windshield, W / m 2 *k, related to vehicle speed;

[0104] V sp —Speed, m / s;

[0105] α1 = 5.68 × (0.9 + 1.03 * V) b )

[0106] α1—Heat transfer coefficient of the inner surface of the windshield, W / m 2 *k is related to the average air velocity inside the vehicle;

[0107] V b —The average air velocity inside the vehicle, in m / s, can be obtained by the current fan speed setting and airflow mode.

[0108] Sunlight compensation temperature C sun The following table can be used to obtain the information:

[0109] Table 1: Relationship between Solar Radiance and Solar Radiance Compensation Temperature

[0110]

[0111] Sunlight intensity can be obtained through light intensity sensors on electric vehicles or through weather forecasts of the area where the electric vehicle is currently driving.

[0112] In other embodiments of this application, step S3 described above has been optimized. Specifically, the method for calculating the fogging margin includes: calculating the fogging margin according to the following formula, FM raw =T wsr -T dew

[0113] Among them: FM raw — Fogging margin, ℃;

[0114] T wsr —Temperature of the inside of the windshield, °C;

[0115] T dew — Dew point temperature of the air inside the vehicle, °C.

[0116] Car interior air dew point temperature T dew By measuring the interior temperature T r The dew point temperature (T) of the air inside the vehicle is obtained from the relative humidity (RH) inside the vehicle and can be obtained according to Table 2. dew ;

[0117] Table 2: Relationship between Dew Point Temperature, Interior Temperature, and Relative Humidity of Vehicle Interior Air

[0118]

[0119] The interior temperature is obtained through an interior temperature sensor, and the interior relative humidity is obtained through an interior humidity sensor. Then, the dew point temperature of the interior air is obtained by referring to a table. Based on the interior air dew point temperature and the temperature of the inside of the windshield, the required fogging margin can be determined.

[0120] In a preferred embodiment of this application, step S4 above has been optimized. Specifically, the method for calculating the first internal air mixing rate includes:

[0121] The fogging margin is divided into multiple heating ranges and multiple cooling ranges. Each heating range corresponds to an internal circulation air mixing rate, and each cooling range corresponds to an internal circulation air mixing rate.

[0122] Determine whether the current control cycle is the first control cycle of the electric vehicle. If it is the first control cycle, take the internal air mixing rate corresponding to the cooling range where the fogging margin of the current control cycle is located as the first internal air mixing rate of the current control cycle.

[0123] If it is not in the first control cycle, the fogging margin of the current control cycle is compared with the fogging margin of the previous control cycle. When the fogging margin of the current control cycle is not less than the fogging margin of the previous control cycle, the internal circulation air mixing rate corresponding to the heating range where the fogging margin of the current control cycle is located is taken as the first internal air mixing rate of the current control cycle. When the fogging margin of the current control cycle is less than the fogging margin of the previous control cycle, the internal circulation air mixing rate corresponding to the cooling range where the fogging margin of the current control cycle is located is taken as the first internal air mixing rate of the current control cycle.

[0124] Specifically, such as Figure 2As shown, the fogging margin is divided in the following way:

[0125] Set (-∞, -3) as the first heating range, and the internal circulation air mixing rate corresponding to the first heating range is 0;

[0126] The second heating range is set to [-3, -1), and the internal air mixing rate corresponding to the second heating range is 20%.

[0127] The third heating range is defined as [-1, 1), and the internal air mixing rate corresponding to the third heating range is 40%.

[0128] [1, 3) is set as the fourth heating zone, and the internal circulation air mixing rate corresponding to the fourth heating zone is 60%;

[0129] [3, 5) is set as the fifth heating zone, and the internal circulation air mixing rate corresponding to the fifth heating zone is 80%;

[0130] The range [5, +∞) is set as the sixth heating range, and the internal air mixing rate corresponding to the sixth heating range is 100%.

[0131] The fogging margin is divided as follows:

[0132] Set (-∞, -4) as the first cooling range, and the internal air mixing rate corresponding to the first cooling range is 0;

[0133] The second cooling zone is defined as [-4, -2), and the internal air mixing rate corresponding to the second cooling zone is 20%.

[0134] The third cooling zone is set to [-2, 0), and the internal air mixing rate corresponding to the third cooling zone is 40%.

[0135] The fourth cooling zone is defined as [0, 2), and the internal air mixing rate corresponding to the fourth cooling zone is 60%.

[0136] [2, 4) is set as the fifth cooling zone, and the internal air mixing rate corresponding to the fifth cooling zone is 80%.

[0137] The sixth cooling zone is defined as [4, +∞), and the internal air mixing rate corresponding to the sixth cooling zone is 100%.

[0138] When calculating the first internal air mixing rate, first determine if the control cycle is the first control cycle. If it is the first control cycle, i.e., when the electric vehicle is powered on, since the electric vehicle has just been powered on, there is naturally no previous control cycle, so it is impossible to determine whether the current temperature is rising or falling. Therefore, the first control cycle is artificially set to use the cooling range for calculating the first internal air mixing rate (e.g., ...). Figure 2(The calculation interval is indicated by the circle in the middle). If the current control cycle is not the first control cycle but there is a previous control cycle, the current control cycle can be judged as either heating or cooling by comparing the fogging margin of the previous control cycle with that of the current control cycle. If the fogging margin of the current control cycle is less than that of the previous control cycle, the internal circulation air mixing rate corresponding to that fogging margin in the cooling interval is taken as the first internal air mixing rate. If the fogging margin of the current control cycle is not less than that of the previous control cycle, the internal circulation air mixing rate corresponding to that fogging margin in the heating interval is taken as the first internal air mixing rate.

[0139] The first internal air mixing rate corresponding to the fogging margin can be calculated using the above method. The first internal air mixing rate corresponds to the internal air gap mixing rate for preventing fogging of the windshield of an electric vehicle. The first internal air mixing rate meets the requirement of preventing fogging of the windshield.

[0140] In a further embodiment of this application, step S5 described above has been optimized. The method for calculating the second internal air mixing rate includes: calculating the second internal air mixing rate according to the following formula.

[0141]

[0142] Among them: RFD frs —Second internal air mixing rate, %;

[0143] a — Fresh air volume required per passenger, m 3 / h / person;

[0144] n — the current number of passengers in the vehicle;

[0145] V – Current fan speed setting and airflow mode, air volume of the air conditioner (m) 3 / h.

[0146] The required fresh air volume 'a' for a single passenger is fixed and obtained through calibration; it is typically taken as 11 m³ / s. 3 / h / person; The current number of passengers n in the vehicle can be obtained through pressure sensors on the seats.

[0147] For example, there are currently 5 occupants in the car, and the current fan speed and airflow mode are set to 200m³ / h. 3 / h, calculate the second internal air mixing rate RFD according to the above formula. frs The initial value is 72.5%. Since the internal and external air mixing rates are controlled as integers (precise single-digit control is impossible in actual operation), a downward correction is applied to 72.5%, resulting in the calculated second internal air mixing rate (RFD). frs It is 70%.

[0148] The second internal air mixing rate is calculated based on the fresh air demand of the occupants. When the air conditioning of an electric vehicle operates according to the second internal air mixing rate, it meets the fresh air demand of the occupants and improves their comfort.

[0149] After obtaining the first and second air mixing rates, the smaller of the first and second air mixing rates is selected as the third air mixing rate. The third air mixing rate thus balances the needs of both windshield defrosting and the fresh air requirements of the vehicle occupants.

[0150] In addition, an auxiliary adjustment function is also involved, such as Figure 1 As shown in S7, if the electric vehicle air conditioner detects during the control process that the outside temperature is not less than the set value and the current air conditioner vent is in automatic mode and the airflow mode is foot blowing mode, a compensation judgment needs to be performed. If the current control cycle is the first control cycle (the first control cycle in this application is the first control cycle after power-on), when the fogging margin is in the range of [-1, +∞), the air conditioner airflow is maintained in foot blowing mode; when the fogging margin is in the range of [-∞, -1), the air conditioner airflow is switched from foot blowing mode. If the current control cycle is not the first control cycle, and the fogging margin of the current control cycle is not less than the fogging margin of the previous control cycle, and the fogging margin is within the range of (-∞, 2), the air conditioner will switch from the foot blowing mode to the foot blowing defrost mode; if the current control cycle is not the first control cycle, and the fogging margin of the current control cycle is less than the fogging margin of the previous control cycle, and the fogging margin is within the range of (-1, ∞), the air conditioner will switch from the foot blowing defrost mode to the foot blowing mode.

[0151] The reason for providing compensation assistance is to avoid the risk of fogging up the windshield under special circumstances.

[0152] This application also provides an energy-saving control system for an electric vehicle air conditioning system, including a temperature acquisition module, a humidity acquisition module, a fogging margin calculation module, a first interior air mixing rate calculation module, a second interior air mixing rate calculation module, and a third interior air mixing rate calculation module. The temperature acquisition module is used to acquire the interior temperature and the exterior temperature; the humidity acquisition module is used to acquire the interior relative humidity; the fogging margin calculation module calculates the fogging margin based on the interior temperature, the exterior temperature, and the interior relative humidity; the first interior air mixing rate calculation module calculates the first interior air mixing rate based on the fogging margin; the second interior air mixing rate calculation module calculates the second interior air mixing rate based on the number of occupants in the vehicle; and the third interior air mixing rate calculation module calculates the third interior air mixing rate based on the first and second interior air mixing rate calculation modules.

[0153] In addition, this application also provides a computer-readable storage medium storing a program that can be loaded and executed by a processor to implement the above-described energy-saving control method for an electric vehicle air conditioning system.

[0154] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method for energy-saving control of air conditioning in electric vehicles, characterized in that: Follow these steps: S1. Calculate the temperature inside the windshield based on the interior and exterior temperatures; S2. Calculate the dew point temperature of the air inside the vehicle based on the vehicle interior temperature and relative humidity. S3. Calculate the fogging margin based on the temperature inside the windshield and the dew point temperature of the air inside the vehicle; S4. Calculate the first internal air mixing rate based on the fogging margin; S5. Calculate the second internal air mixing rate based on the number of people in the vehicle; S6. Determine the third internal air mixing rate based on the first internal air mixing rate and the second internal air mixing rate, and control the vehicle air conditioning according to the third internal air mixing rate. In step S4, the method for calculating the first internal air mixing rate includes: The fogging margin is divided into multiple heating ranges and multiple cooling ranges. Each heating range corresponds to an internal circulation air mixing rate, and each cooling range corresponds to an internal circulation air mixing rate. Determine whether the current control cycle is the first control cycle of the electric vehicle. If it is the first control cycle, take the internal air mixing rate corresponding to the cooling range where the fogging margin of the current control cycle is located as the first internal air mixing rate of the current control cycle. If it is not in the first control cycle, the fogging margin of the current control cycle is compared with the fogging margin of the previous control cycle. When the fogging margin of the current control cycle is not less than the fogging margin of the previous control cycle, the internal air mixing rate corresponding to the heating range where the fogging margin of the current control cycle is located is taken as the first internal air mixing rate of the current control cycle. When the fogging margin of the current control cycle is less than the fogging margin of the previous control cycle, the internal air mixing rate corresponding to the cooling range where the fogging margin of the current control cycle is located is taken as the first internal air mixing rate of the current control cycle.

2. The energy-saving control method for electric vehicle air conditioning as described in claim 1, characterized in that: In step S1, the method for calculating the temperature inside the windshield includes: Calculate the temperature inside the windshield using the following formula. Wherein: T wsr —Temperature of the inside of the windshield; K—Heat transfer coefficient of the windshield; T am —Outside temperature; T r —Interior temperature; α1—Heat transfer coefficient of the inner surface of the windshield; C sun —Sunlight compensation temperature.

3. The energy-saving control method for electric vehicle air conditioning as described in claim 1, characterized in that: In step S3, the method for calculating the fogging margin includes: calculating the fogging margin according to the following formula. Among them: FM raw —Fog margin; T wsr —Temperature of the inside of the windshield; T dew — Dew point temperature of the air inside the vehicle.

4. The energy-saving control method for electric vehicle air conditioning as described in claim 1, characterized in that: Dividing the fogging margin into multiple temperature rise intervals, with each interval corresponding to a specific internal air mixing rate, includes methods such as dividing the fogging margin according to the following methods. Set (-∞, -3) as the first heating range, and the internal circulation air mixing rate corresponding to the first heating range is 0; The second heating range is defined as [-3, -1), and the internal air mixing rate corresponding to the second heating range is 20%. The third heating zone is defined as [-1, 1), and the internal air mixing rate corresponding to the third heating zone is 40%. [1, 3) is set as the fourth heating zone, and the internal air mixing rate corresponding to the fourth heating zone is 60%; [3, 5) is set as the fifth heating zone, and the internal air mixing rate corresponding to the fifth heating zone is 80%; The range [5, +∞) is set as the sixth heating range, and the internal air mixing rate corresponding to the sixth heating range is 100%.

5. The energy-saving control method for electric vehicle air conditioning as described in claim 4, characterized in that: Dividing the fogging margin into multiple cooling zones, with each cooling zone corresponding to a specific internal air mixing rate, includes methods such as dividing the fogging margin according to the following methods. The first cooling range is set to (-∞, -4), and the internal air mixing rate corresponding to the first cooling range is 0. The second cooling zone is defined as [-4, -2), and the internal air mixing rate corresponding to the second cooling zone is 20%. The third cooling zone is defined as [-2, 0), and the internal air mixing rate corresponding to the third cooling zone is 40%. The zone [0, 2) is defined as the fourth cooling zone, and the internal air mixing rate corresponding to the fourth cooling zone is 60%. [2, 4) is set as the fifth cooling zone, and the internal air mixing rate corresponding to the fifth cooling zone is 80%; The range [4, +∞) is set as the sixth cooling range, and the internal air mixing rate corresponding to the sixth cooling range is 100%.

6. The energy-saving control method for electric vehicle air conditioning as described in claim 1, characterized in that: In step S5, the method for calculating the second internal air mixing rate includes: calculating the second internal air mixing rate according to the following formula. Among them: RFD frs —Second internal air mixing rate; a — The amount of fresh air required per passenger; n — the current number of passengers in the vehicle; V – Current fan speed setting and airflow volume of the air conditioner under the current fan speed mode.

7. The energy-saving control method for electric vehicle air conditioning as described in claim 1, characterized in that: In step S6, the method for determining the third internal air mixing rate based on the first internal air mixing rate and the second internal air mixing rate includes: selecting the smaller value between the first internal air mixing rate and the second internal air mixing rate as the third internal air mixing rate.

8. An energy-saving control system for an electric vehicle air conditioning system, characterized in that: The control system is controlled according to any one of the energy-saving control methods for electric vehicle air conditioning as described in claims 1 to 7, including: A temperature acquisition module, which is used to acquire the interior temperature and the exterior temperature of the vehicle; A humidity acquisition module, which is used to collect the relative humidity inside the vehicle; A fogging margin calculation module calculates the fogging margin based on the vehicle interior temperature, vehicle exterior temperature, and vehicle interior relative humidity. The first internal air mixing rate calculation module calculates the first internal air mixing rate based on the fogging margin. The second interior air mixing rate calculation module calculates the second interior air mixing rate based on the number of people in the vehicle. The third internal air mixing rate calculation module calculates the third internal air mixing rate based on the first internal air mixing rate calculation module and the second internal air mixing rate calculation module.

9. A computer-readable storage medium, characterized in that: The program is stored and can be loaded and executed by a processor to implement an energy-saving control method for an electric vehicle air conditioning as described in any one of claims 1 to 7.

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