Air conditioning system for a vehicle and method of controlling the same
By installing a temperature sensor on the outer wall of the condenser tube in the condenser, the pressure of the coolant fluid at the inlet of the condenser tube is calculated, and the compressor status is controlled. This solves the problem of increased cost caused by temperature and pressure sensors in the prior art, and achieves high-precision control and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHEJIANG GEELY HLDG GRP CO LTD
- Filing Date
- 2024-10-21
- Publication Date
- 2026-07-03
Smart Images
Figure CN119189613B_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of automotive air conditioning technology, and more particularly to an air conditioning system for vehicles and a control method thereof. Background Technology
[0002] To ensure the efficient and stable operation of automotive air conditioning, multiple temperature and pressure sensors are often installed in the air conditioning system. However, the installation of temperature and pressure sensors increases the cost of the entire vehicle air conditioning system. Summary of the Invention
[0003] To address the aforementioned technical problems, this disclosure provides an air conditioning system for vehicles and a control method thereof, which helps reduce production costs.
[0004] In a first aspect, embodiments of this disclosure provide an air conditioning system for a vehicle, comprising: a closed-loop system, the closed-loop system including a compressor and a condenser connected by a refrigerant pipeline, wherein a coolant fluid is disposed within the refrigerant pipeline; a temperature sensor disposed on the outer wall of a condenser tube in the condenser; a calculation unit configured to acquire a first temperature value collected by the temperature sensor and calculate the pressure of the coolant fluid at the inlet of the condenser tube based on the first temperature value to obtain a first pressure value; and a control unit configured to acquire the first pressure value and control the state of the compressor based on the first pressure value.
[0005] In some embodiments, the temperature sensor is disposed in the middle region of the outer wall of the condenser tube.
[0006] Secondly, this disclosure also provides a control method for an air conditioning system for a vehicle. The air conditioning system includes a closed-loop system and a temperature sensor. The closed-loop system includes a compressor and a condenser connected by a refrigerant pipeline. A coolant fluid is disposed in the refrigerant pipeline. The temperature sensor is disposed on the outer wall of the condenser tube in the condenser. The control method includes: acquiring the temperature of the outer wall of the condenser tube to obtain a first temperature value; calculating the pressure of the coolant fluid at the inlet of the condenser tube based on the first temperature value to obtain a first pressure value; and controlling the state of the compressor based on the first pressure value.
[0007] In some embodiments, calculating the pressure of the coolant fluid at the inlet of the condenser tube based on a first temperature value to obtain a first pressure value includes: calculating the pressure of the coolant fluid inside the condenser tube based on the first temperature value to obtain a second pressure value; obtaining the pressure drop between the pressure of the coolant fluid inside the condenser tube and the pressure of the coolant fluid at the inlet of the condenser tube; and combining the second pressure value and the pressure drop to obtain the first pressure value.
[0008] In some embodiments, calculating the pressure of the coolant fluid in the condenser tube based on the first temperature value to obtain a second pressure value includes: calculating the temperature of the coolant fluid in the condenser tube based on the first temperature value to obtain a second temperature value; and obtaining a second pressure value based on the second temperature value.
[0009] In some embodiments, calculating the temperature of the coolant fluid inside the condenser tube based on the first temperature value to obtain the second temperature value includes: obtaining the ambient air temperature to obtain the third temperature value; and obtaining the second temperature value based on the first temperature value, the third temperature value, the heat transfer coefficient of the coolant fluid to the tube wall of the condenser tube, and the heat transfer coefficient of the tube wall of the condenser tube to the air.
[0010] In some embodiments, the method further includes: obtaining the heat transfer coefficient of the coolant fluid to the wall of the condenser tube based on the flow rate of the coolant fluid.
[0011] In some embodiments, the method further includes: obtaining the heat transfer coefficient of the condenser wall to air based on the vehicle speed.
[0012] In some embodiments, the method further includes: obtaining the pressure drop between the pressure of the coolant fluid inside the condenser tube and the pressure of the coolant fluid at the inlet of the condenser tube, based on the flow rate of the coolant fluid.
[0013] In some embodiments, the closed-loop system further includes an expansion valve, and the control method further includes obtaining the flow rate of the coolant fluid based on the compressor speed and the opening degree of the expansion valve.
[0014] The technical solution provided in this disclosure has the following advantages compared with the prior art:
[0015] In the air conditioning system disclosed herein, a temperature sensor is installed on the outer wall of the condenser tube in the condenser. The temperature sensor acquires the temperature of the outer wall of the condenser tube, obtaining a first temperature value. After acquiring the first temperature value, the calculation unit calculates the pressure of the coolant fluid at the inlet of the condenser tube, obtaining a first pressure value. The control unit acquires the first pressure value and controls the compressor's state accordingly, resulting in high control precision and ensuring the reliability of the entire air conditioning system. Furthermore, only a temperature sensor needs to be installed on the outer wall of the condenser tube in the condenser. The pressure of the coolant fluid at the inlet of the condenser tube can be calculated using the first temperature value acquired by the temperature sensor, and the compressor's state can be controlled based on this pressure. There is no need to install a separate pressure sensor at the inlet of the condenser tube, and the cost of the temperature sensor is significantly lower than that of the pressure sensor, effectively reducing production costs. Attached Figure Description
[0016] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.
[0017] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a structural schematic diagram of an air conditioning system provided in this disclosure;
[0019] Figure 2 This is a flowchart illustrating a control method for an air conditioning system provided in this disclosure;
[0020] Figure 3 This is a flowchart illustrating step S20 in the control method of the air conditioning system provided in this disclosure;
[0021] Figure 4 This is a flowchart illustrating step S21 of the control method for the air conditioning system provided in this disclosure. Detailed Implementation
[0022] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.
[0023] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.
[0024] Figure 1 This is a structural schematic diagram of an air conditioning system provided in this disclosure, for reference. Figure 1 This embodiment provides an air conditioning system for a vehicle, including:
[0025] A closed-loop system 10 includes a compressor 12 and a condenser 13 connected by a refrigerant line 11, and a coolant fluid is provided in the refrigerant line 11.
[0026] Temperature sensor 20 is disposed on the outer wall of the condenser tube in condenser 13;
[0027] The calculation unit (not shown in the figure) is used to obtain the first temperature value collected by the temperature sensor 20 and calculate the pressure of the coolant fluid at the inlet of the condenser tube based on the first temperature value to obtain the first pressure value.
[0028] The control unit (not shown in the figure) is used to acquire a first pressure value and control the state of the compressor 12 according to the first pressure value.
[0029] Specifically, in the air conditioning system provided in this embodiment, the temperature sensor 20 is installed on the outer wall of the condenser tube in the condenser 13, so that the temperature sensor 20 can obtain the temperature of the outer wall of the condenser tube in the condenser 13 and obtain a first temperature value. After the calculation unit obtains the first temperature value collected by the temperature sensor 20, it can calculate the pressure of the coolant fluid at the inlet of the condenser tube based on the first temperature value and obtain a first pressure value. The control unit is used to obtain the first pressure value and control the state of the compressor 12 based on the first pressure value. The control accuracy is high, thereby ensuring the reliability of the entire air conditioning system operation.
[0030] For example, when the first pressure value is between 0.3 MPa and 2.8 MPa, the entire air conditioning system operates normally; when the first pressure value is too high, the operating speed of the compressor 12 is reduced to ensure that the piping system in the entire air conditioning system will not burst or leak due to continuous pressure increase; when the first pressure value is too low, the start of the compressor 12 is restricted to prevent the compressor 12 from being damaged by liquid slugging.
[0031] Meanwhile, after the calculation unit obtains the first temperature value collected by the temperature sensor 20, it can calculate the pressure of the coolant fluid at the inlet of the condenser tube based on the first temperature value to obtain the first pressure value. The control unit is used to control the state of the compressor 12 based on the first pressure value. That is, only the temperature sensor 20 needs to be installed on the outer wall of the condenser tube in the condenser 13. The pressure of the coolant fluid at the inlet of the condenser tube can be calculated by the first temperature value collected by the temperature sensor 20, and the state of the compressor 12 can be controlled based on the pressure of the coolant fluid at the inlet of the condenser tube. There is no need to install a pressure sensor at the inlet of the condenser tube in the condenser 13. Moreover, the cost of the temperature sensor 20 is much lower than the cost of the pressure sensor, thereby effectively reducing production costs.
[0032] Optionally, the temperature sensor 20 can be a surface-mount temperature sensor, which is attached to the outer wall of the condenser tube in the condenser 13. Since surface-mount temperature sensors are less expensive, using them can further reduce production costs.
[0033] In some alternative embodiments, the closed-loop system 10 may further include an expansion valve 14 and an evaporator 15, wherein the compressor 12, condenser 13, expansion valve 14 and evaporator 15 are connected in sequence via refrigerant lines 11.
[0034] It should be noted that in the air conditioning system provided in the embodiments of this disclosure, the closed-loop system 10 may also include a blower 17 disposed on the side of the evaporator 15 and a cooling fan disposed on the side of the condenser 13. Of course, in other embodiments of this disclosure, the air conditioning system may also include other components, which will not be described in detail here.
[0035] Continue to refer to Figure 1 In some alternative embodiments, the temperature sensor 20 is disposed in the middle region of the outer wall of the condenser tube.
[0036] Specifically, the coolant fluid in the middle region inside the condenser tube of the condenser 13 is in a gas-liquid mixed state, that is, the coolant fluid in the middle region inside the condenser tube of the condenser 13 is in a saturated state. In the saturated state, the temperature and pressure of the coolant fluid can correspond one-to-one. The temperature sensor 20 is set in the middle region of the outer wall of the condenser tube, so that the temperature sensor 20 can obtain the temperature of the outer wall of the condenser tube in the condenser 13 and obtain a first temperature value. Then, the temperature of the coolant fluid in the middle region inside the condenser tube can be calculated based on the first temperature value to obtain a second temperature value. Then, the pressure of the coolant fluid inside the condenser tube can be calculated based on the second temperature value to obtain a second pressure value. Then, the pressure of the coolant fluid at the inlet of the condenser tube can be calculated based on the second pressure value to obtain a first pressure value.
[0037] Optionally, the temperature sensor 20 can be set in the middle 60% area of the outer wall of the condenser tube. Further, the temperature sensor 20 can be set in the very middle area of the outer wall of the condenser tube, so that the pressure of the coolant fluid at the inlet of the condenser tube can be calculated more accurately, which is conducive to improving the control accuracy and thus ensuring the reliability of the entire air conditioning system.
[0038] Figure 2 This is a flowchart illustrating a control method for an air conditioning system provided in this disclosure. (Refer to...) Figure 2 This embodiment provides a control method for a vehicle air conditioning system. The air conditioning system includes a closed-loop system and a temperature sensor. The closed-loop system includes a compressor and a condenser connected by refrigerant lines. Coolant fluid is disposed within the refrigerant lines. The temperature sensor is disposed on the outer wall of the condenser tube in the condenser. The control method includes:
[0039] Step S10: Obtain the temperature of the outer wall of the condenser tube to obtain the first temperature value;
[0040] Step S20: Calculate the pressure of the coolant fluid at the inlet of the condenser tube based on the first temperature value to obtain the first pressure value;
[0041] Step S30: Control the state of the compressor according to the first pressure value.
[0042] For details, please refer to [link / reference]. Figure 1 and Figure 2 The control method of the air conditioning system provided in this embodiment is applied to the air conditioning system provided in the embodiment of this disclosure. In the air conditioning system provided in the embodiment of this disclosure, the temperature sensor 20 is set on the outer wall of the condenser tube in the condenser 13, so that the temperature sensor 20 can obtain the temperature of the outer wall of the condenser tube in the condenser 13 and obtain a first temperature value. Then, the pressure of the coolant fluid at the inlet of the condenser tube can be calculated based on the first temperature value to obtain a first pressure value. Then, the state of the compressor 12 can be controlled based on the first pressure value, which has high control accuracy and thus ensures the reliability of the entire air conditioning system operation.
[0043] Simultaneously, the pressure of the coolant fluid at the inlet of the condenser tube can be calculated based on the first temperature value to obtain the first pressure value. Then, the state of the compressor 12 can be controlled based on the first pressure value. That is, only a temperature sensor 20 needs to be installed on the outer wall of the condenser tube in the condenser 13. The pressure of the coolant fluid at the inlet of the condenser tube can be calculated by the first temperature value collected by the temperature sensor 20, and the state of the compressor 12 can be controlled based on the pressure of the coolant fluid at the inlet of the condenser tube. There is no need to install a pressure sensor at the inlet of the condenser tube in the condenser 13. Moreover, the cost of the temperature sensor 20 is much lower than the cost of the pressure sensor, thereby effectively reducing production costs.
[0044] Figure 3 This is a flowchart illustrating step S20 of the control method for the air conditioning system provided in this disclosure, for reference. Figure 2 and Figure 3 In some optional embodiments, step S20, calculating the pressure of the coolant fluid at the inlet of the condenser based on the first temperature value, to obtain the first pressure value includes:
[0045] Step S21: Calculate the pressure of the coolant fluid in the condenser tube based on the first temperature value to obtain the second pressure value;
[0046] Step S22: Obtain the pressure drop between the pressure of the coolant fluid inside the condenser tube and the pressure of the coolant fluid at the inlet of the condenser tube;
[0047] Step S23: Combine the second pressure value and the pressure loss to obtain the first pressure value.
[0048] Specifically, the pressure of the coolant fluid inside the condenser is calculated based on the first temperature value. At the same time, the pressure loss between the pressure of the coolant fluid inside the condenser and the pressure of the coolant fluid at the inlet of the condenser is obtained. The second pressure value and the pressure loss are combined to obtain the first pressure value. That is, the pressure of the coolant fluid at the inlet of the condenser can be obtained by adding the pressure loss between the pressure of the coolant fluid inside the condenser and the pressure of the coolant fluid at the inlet of the condenser. The state of the compressor 12 can then be controlled according to the pressure of the coolant fluid at the inlet of the condenser, with high control precision, thereby ensuring the reliability of the entire air conditioning system.
[0049] Figure 4 This is a flowchart illustrating step S21 of the control method for the air conditioning system provided in this disclosure, see reference. Figures 2-4 In some optional embodiments, step S21, calculating the pressure of the coolant fluid in the condenser tube based on the first temperature value to obtain the second pressure value, includes:
[0050] Step S211: Calculate the temperature of the coolant fluid in the condenser tube based on the first temperature value to obtain the second temperature value;
[0051] Step S212: Obtain the second pressure value based on the second temperature value.
[0052] Specifically, the temperature of the coolant fluid in the condenser is calculated based on the first temperature value to obtain the second temperature value. The temperature of the coolant fluid in the condenser and the pressure of the coolant fluid in the condenser are in one-to-one correspondence, that is, the second temperature value and the second pressure value are in one-to-one correspondence, so the second pressure value can be obtained based on the second temperature value.
[0053] For example, the correspondence between the second temperature value t2 and the second pressure value P2 can be found in Table 1.
[0054] Table 1
[0055]
[0056]
[0057]
[0058] It should be noted that Table 1 only shows one example of the correspondence between the second temperature value t2 and the second pressure value P2. Table 1 is only for illustrative purposes. The correspondence between the second temperature value t2 and the second pressure value P2 belongs to the calibration test value, which can be tested according to the specific vehicle.
[0059] Continue to refer to Figures 2-4 In some optional embodiments, step S211, calculating the temperature of the coolant fluid in the condenser tube based on the first temperature value to obtain the second temperature value, includes:
[0060] Obtain the ambient air temperature to get the third temperature value;
[0061] The second temperature value is obtained based on the first temperature value, the third temperature value, the heat transfer coefficient of the coolant fluid to the condenser tube wall, and the heat transfer coefficient of the condenser tube wall to the air.
[0062] Specifically, according to the heat transfer equation, we have: Φ1 = AK1(t2-t1) and Φ2 = AK2(t1-t3), where Φ1 is the heat flow rate of the coolant fluid to the condenser tube wall, Φ2 is the heat flow rate of the condenser tube wall to the air, A is the heat transfer area, t2 is the second temperature value, t1 is the first temperature value, t3 is the third temperature value, K1 is the heat transfer coefficient of the coolant fluid to the condenser tube wall, and K2 is the heat transfer coefficient of the condenser tube wall to the air. According to the law of conservation of energy, in an air conditioning system, the heat of the coolant fluid is carried away by the air. Therefore, the heat transferred by the coolant fluid to the condenser tube wall is equal to the heat transferred by the condenser tube wall to the air, i.e., Φ1 = Φ2. Therefore, we can obtain: Therefore, based on this formula, the temperature of the coolant fluid in the condenser tube can be calculated according to the first temperature value t1, the third temperature value t3, the heat transfer coefficient K1 of the coolant fluid to the tube wall of the condenser tube, and the heat transfer coefficient K2 of the tube wall of the condenser tube to the air, and the second temperature value t2 can be obtained.
[0063] In some alternative embodiments, the control method further includes:
[0064] The heat transfer coefficient of the coolant fluid to the tube wall of the condenser is obtained based on the flow rate of the coolant fluid.
[0065] Specifically, the flow rate of the coolant fluid and the heat transfer coefficient of the coolant fluid to the tube wall of the condenser are in one-to-one correspondence, so the heat transfer coefficient of the coolant fluid to the tube wall of the condenser can be obtained according to the flow rate of the coolant fluid.
[0066] For example, the relationship between the flow rate of the coolant fluid and the heat transfer coefficient of the coolant fluid to the tube wall of the condenser can be found in Table 2.
[0067] Table 2
[0068] Flow rate kg / h 10 30 50 70 90 110 heat transfer coefficient 3000 4500 6000 7500 9000 1000
[0069] It should be noted that Table 2 only shows one example of the relationship between the flow rate of the coolant fluid and the heat transfer coefficient of the coolant fluid to the wall of the condenser tube. Table 2 is only for illustrative purposes. The relationship between the flow rate of the coolant fluid and the heat transfer coefficient of the coolant fluid to the wall of the condenser tube is a calibration test value, which can be tested according to the specific vehicle.
[0070] In some alternative embodiments, the control method further includes:
[0071] The heat transfer coefficient of the condenser tube wall to air is obtained based on the vehicle speed.
[0072] Specifically, the vehicle speed and the heat transfer coefficient of the condenser pipe wall to the air are in one-to-one correspondence, so the heat transfer coefficient of the condenser pipe wall to the air can be obtained according to the vehicle speed.
[0073] For example, the relationship between vehicle speed and the heat transfer coefficient of the condenser pipe wall to air can be found in Table 3.
[0074] Table 3
[0075] Vehicle speed (km / h) 10 30 50 70 90 120 heat transfer coefficient 30 60 90 120 150 200
[0076] It should be noted that Table 3 only shows one example of the relationship between vehicle speed and the heat transfer coefficient of the condenser pipe wall to air. Table 3 is only for illustrative purposes. The relationship between vehicle speed and the heat transfer coefficient of the condenser pipe wall to air is a calibration test value, which can be tested according to the specific vehicle.
[0077] In some alternative embodiments, the closed-loop system 10 may further include an expansion valve 14, wherein the compressor 12, the condenser 13 and the expansion valve 14 are connected in sequence via a refrigerant line 11.
[0078] Of course, in other embodiments of this disclosure, the air conditioning system may also include other components, which will not be described in detail here.
[0079] Control methods also include:
[0080] The flow rate of the coolant fluid is obtained based on the compressor speed and the opening degree of the expansion valve.
[0081] Specifically, the flow rate of the coolant fluid is related to the compressor speed and the opening degree of the expansion valve, so the flow rate of the coolant fluid can be obtained based on the compressor speed and the opening degree of the expansion valve.
[0082] For example, the correspondence between the flow rate of the coolant fluid, the speed of the compressor, and the opening degree of the expansion valve can be found in Table 4.
[0083] Table 4
[0084] 1000 2000 3000 4000 5000 6000 7000 0 0 0 0 0 0 0 0 20 3.4 12.4 25.4 41.1 58.4 76.4 94.5 40 4.1 14.9 30.5 49.3 70.0 91.7 113.4 60 4.9 17.9 36.6 59.2 84.0 110.0 136.1 80 5.9 21.5 43.9 71.0 100.8 132.0 163.3 100 7.1 25.8 52.7 85.2 121.0 158.4 196.0
[0085] In Table 4, the values in the first row are the compressor speed (in rpm), the values in the first column are the expansion valve opening, and the remaining values are the corresponding coolant fluid flow rates (in kg / h).
[0086] It should be noted that Table 4 only shows one example of the correspondence between the coolant fluid flow rate, the compressor speed, and the expansion valve opening. Table 4 is only for illustrative purposes. The correspondence between the coolant fluid flow rate, the compressor speed, and the expansion valve opening is a calibration test value, which can be tested according to the specific vehicle.
[0087] The above description is merely a preferred embodiment of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features disclosed in this disclosure that have similar functions.
[0088] Furthermore, while the operations are described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or in a sequential order. In certain environments, multitasking and parallel processing may be advantageous. Similarly, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of this disclosure. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.
[0089] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.
[0090] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. An air conditioning system for a vehicle, characterized by, include: A closed-loop system, comprising a compressor and a condenser connected by refrigerant piping, wherein a coolant fluid is disposed within the refrigerant piping; A temperature sensor is disposed in the middle region of the outer wall of the condenser tube in the condenser; The calculation unit is used to acquire a first temperature value collected by the temperature sensor, calculate the temperature of the coolant fluid in the condenser tube based on the first temperature value to obtain a second temperature value, acquire the pressure of the coolant fluid in the condenser tube based on the second temperature value to obtain a second pressure value, acquire the pressure loss between the pressure of the coolant fluid in the condenser tube and the pressure of the coolant fluid at the inlet of the condenser tube, and combine the second pressure value and the pressure loss to obtain the first pressure value. A control unit is configured to acquire the first pressure value and control the state of the compressor based on the first pressure value.
2. A control method for an air conditioning system in a vehicle, characterized in that, The air conditioning system includes a closed-loop system and a temperature sensor. The closed-loop system includes a compressor and a condenser connected by refrigerant piping. Coolant fluid is disposed within the refrigerant piping. The temperature sensor is located in the middle region of the outer wall of the condenser tubes. The control method includes: The temperature of the outer wall of the condenser is obtained to get a first temperature value; The temperature of the coolant fluid inside the condenser is calculated based on the first temperature value to obtain the second temperature value; The pressure of the coolant fluid in the condenser is obtained based on the second temperature value, thus obtaining the second pressure value; The pressure drop between the pressure of the coolant fluid inside the condenser tube and the pressure of the coolant fluid at the inlet of the condenser tube is obtained; The second pressure value and the pressure loss are combined to obtain the first pressure value; The state of the compressor is controlled according to the first pressure value.
3. The control method according to claim 2, characterized in that, The step of calculating the temperature of the coolant fluid in the condenser tube based on the first temperature value to obtain the second temperature value includes: Obtain the ambient air temperature to get the third temperature value; The second temperature value is obtained based on the first temperature value, the third temperature value, the heat transfer coefficient of the coolant fluid to the wall of the condenser tube, and the heat transfer coefficient of the wall of the condenser tube to the air.
4. The control method according to claim 3, characterized by Also includes: The heat transfer coefficient of the coolant fluid to the tube wall of the condenser is obtained based on the flow rate of the coolant fluid.
5. The control method according to claim 3, characterized by, Also includes: The heat transfer coefficient of the condenser tube wall to air is obtained based on the vehicle speed.
6. The control method according to claim 2, characterized by Also includes: The pressure drop between the pressure of the coolant fluid inside the condenser tube and the pressure of the coolant fluid at the inlet of the condenser tube is obtained based on the flow rate of the coolant fluid.
7. The control method according to claim 4 or 6, characterized by, The closed-loop system also includes an expansion valve; The control method further includes: The flow rate of the coolant fluid is obtained based on the compressor speed and the opening degree of the expansion valve.