Air conditioning system for vehicle and control method thereof

Abstract

The invention relates to the technical field of automobile air conditioners, in particular to an air conditioning system for a vehicle and a control method thereof.The air conditioning system for the vehicle comprises a closed circulation system, the closed circulation system comprises a compressor and a condenser which are connected through a refrigerant pipeline, and coolant fluid is arranged in the refrigerant pipeline; the temperature sensor is arranged on the outer wall of a condensation pipe in the condenser; the calculation unit is used for obtaining the first temperature value collected by the temperature sensor and calculating the pressure of the coolant fluid at the inlet of the condensation pipe according to the first temperature value to obtain a first pressure value; and the control unit is used for obtaining the first pressure value and controlling the state of the compressor according to the first pressure value. The invention is beneficial to reducing the production cost.

Description

Technical Field

[0001] The present disclosure relates to the technical field of automobile air conditioning, and in particular to an air conditioning system for a vehicle and a control method thereof. Background Art

[0002] In order to ensure efficient and stable operation of automobile air conditioning, the air conditioning system is often equipped with multiple temperature sensors and pressure sensors, but the installation of temperature sensors and pressure sensors will increase the cost of the entire vehicle air conditioning system. Summary of the invention

[0003] In order to solve the above technical problems, the present disclosure provides an air-conditioning system for a vehicle and a control method thereof, which are beneficial to reducing production costs.

[0004] In a first aspect, an embodiment of the present disclosure provides an air-conditioning system for a vehicle, comprising: a closed circulation system, the closed circulation system comprising a compressor and a condenser connected by a refrigerant pipeline, a coolant fluid being arranged in the refrigerant pipeline; a temperature sensor, the temperature sensor being arranged on the outer wall of a condenser tube in the condenser; a calculation unit, the calculation unit being used to obtain a first temperature value collected by the temperature sensor, and to calculate the pressure of the coolant fluid at the inlet of the condenser tube according to the first temperature value to obtain a first pressure value; and a control unit, the control unit being used to obtain the first pressure value, and to control the state of the compressor according to the first pressure value.

[0005] In some embodiments, the temperature sensor is disposed in a middle area of ​​the outer wall of the condenser.

[0006] In a second aspect, the present disclosure also provides a control method for an air-conditioning system of a vehicle, the air-conditioning system comprising a closed circulation system and a temperature sensor, the closed circulation system comprising a compressor and a condenser connected by a refrigerant pipeline, a coolant fluid is arranged in the refrigerant pipeline, and the temperature sensor is arranged on the outer wall of a condenser tube in the condenser; the control method comprises: obtaining 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 according to the first temperature value to obtain a first pressure value; and controlling the state of the compressor according to the first pressure value.

[0007] In some embodiments, the pressure of the coolant fluid at the inlet of the condenser is calculated according to the first temperature value to obtain the first pressure value, which includes: calculating the pressure of the coolant fluid in the condenser according to the first temperature value to obtain a second pressure value; obtaining the pressure loss between the pressure of the coolant fluid in the condenser and the pressure of the coolant fluid at the inlet of the condenser; and combining the second pressure value and the pressure loss to obtain the first pressure value.

[0008] In some embodiments, calculating the pressure of the coolant fluid in the condenser according to the first temperature value to obtain the second pressure value includes: calculating the temperature of the coolant fluid in the condenser according to the first temperature value to obtain the second temperature value; and obtaining the second pressure value according to the second temperature value.

[0009] In some embodiments, calculating the temperature of the coolant fluid in the condenser according to the first temperature value to obtain the second temperature value includes: obtaining the ambient air temperature to obtain a third temperature value; obtaining the second temperature value according to the first temperature value, the third temperature value, the heat transfer coefficient of the coolant fluid to the tube wall of the condenser and the heat transfer coefficient of the tube wall of the condenser to the air.

[0010] In some embodiments, the method further includes: obtaining a heat transfer coefficient of the coolant fluid to the tube wall of the condenser tube according to 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 the air according to the vehicle speed.

[0012] In some embodiments, the method further includes: obtaining a pressure loss between a pressure of the coolant fluid in the condenser tube and a pressure of the coolant fluid at an inlet of the condenser tube according to a flow rate of the coolant fluid.

[0013] In some embodiments, the closed cycle system further includes an expansion valve, and the control method further includes: obtaining the flow rate of the coolant fluid according to the rotation speed of the compressor and the opening degree of the expansion valve.

[0014] Compared with the prior art, the technical solution provided by the present invention has the following advantages:

[0015] In the air conditioning system provided by the present disclosure, a temperature sensor is arranged on the outer wall of the condenser tube in the condenser, so that the temperature sensor can obtain the temperature of the outer wall of the condenser tube in the condenser to obtain a first temperature value. After the calculation unit obtains the first temperature value collected by the temperature sensor, it can calculate the pressure of the coolant fluid at the inlet of the condenser tube according to the first temperature value to obtain a first pressure value. The control unit is used to control the state of the compressor according to the first pressure value after obtaining the first pressure value. The control accuracy is high, thereby ensuring the reliability of the operation of the entire air conditioning system. At the same time, it is only necessary to arrange 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 can be calculated by the first temperature value collected by the temperature sensor, and the state of the compressor can be controlled according to the pressure of the coolant fluid at the inlet of the condenser tube. There is no need to arrange a pressure sensor at the inlet of the condenser tube in the condenser, and the cost of the temperature sensor is much less than the cost of the pressure sensor, thereby effectively reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 is a structural schematic diagram of an air conditioning system provided by the present disclosure;

[0019] Figure 2 is a flow chart of a control method of an air conditioning system provided by the present disclosure;

[0020] Figure 3 is a flow chart of step S20 in the air conditioning system control method provided by the present disclosure;

[0021] Figure 4 It is a flow chart of step S21 in the control method of the air-conditioning system provided by the present disclosure. DETAILED DESCRIPTION

[0022] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0024] Figure 1 is a structural schematic diagram of an air conditioning system provided by the present disclosure, with reference to Figure 1 , this embodiment provides an air conditioning system for a vehicle, comprising:

[0025] A closed circulation system 10, the closed circulation system 10 comprises a compressor 12 and a condenser 13 connected by a refrigerant pipeline 11, and a coolant fluid is arranged in the refrigerant pipeline 11;

[0026] A temperature sensor 20, the temperature sensor 20 is arranged on the outer wall of the condenser tube in the condenser 13;

[0027] A calculation unit (not shown in the figure), the calculation unit is used to obtain a first temperature value collected by the temperature sensor 20, and calculate the pressure of the coolant fluid at the inlet of the condenser according to the first temperature value to obtain a first pressure value;

[0028] A control unit (not shown in the figure), the control unit is used to obtain the 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 arranged 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 to 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 according to the first temperature value to obtain a first pressure value. The control unit is used to control the state of the compressor 12 according to the first pressure value after obtaining the first pressure value, and the control accuracy is high, thereby ensuring the reliability of the operation of the entire air-conditioning system.

[0030] Exemplarily, when the first pressure value is between 0.3Mpa and 2.8Mpa, the entire air-conditioning system operates normally; when the first pressure value is too high, the speed of the compressor 12 is reduced to ensure that the piping system in the entire air-conditioning system will not explode or leak due to continuous pressure increases; when the first pressure value is too low, the start-up of the compressor 12 is restricted to prevent liquid shock damage to the compressor 12.

[0031] At the same time, 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 according to the first temperature value to obtain the first pressure value. The control unit is used to control the state of the compressor 12 according to the first pressure value after obtaining the first pressure value. That is, it is only necessary to set the temperature sensor 20 on the outer wall of the condenser in the condenser 13. The pressure of the coolant fluid at the inlet of the condenser can be calculated by the first temperature value collected by the temperature sensor 20, and the state of the compressor 12 can be controlled according to the pressure of the coolant fluid at the inlet of the condenser. There is no need to set a pressure sensor at the inlet of the condenser in the condenser 13, and the cost of the temperature sensor 20 is much smaller than the cost of the pressure sensor, thereby effectively reducing the production cost.

[0032] Optionally, the temperature sensor 20 may be a patch temperature sensor, which is attached to the outer wall of the condenser tube in the condenser 13. Since the cost of the patch temperature sensor is relatively low, the use of the patch temperature sensor can further reduce the production cost.

[0033] In some optional embodiments, the closed circulation system 10 may further include an expansion valve 14 and an evaporator 15 , wherein the compressor 12 , the condenser 13 , the expansion valve 14 and the evaporator 15 are sequentially connected via a refrigerant pipeline 11 .

[0034] It should be noted that in the air-conditioning system provided in the embodiment of the present disclosure, the closed circulation system 10 may also include a blower 17 arranged on one side of the evaporator 15, and a cooling fan arranged on one side of the condenser 13. Of course, in other embodiments of the present disclosure, the air-conditioning system may also include other components, which will not be described one by one in the present disclosure.

[0035] Continue to refer Figure 1 In some optional embodiments, the temperature sensor 20 is disposed in the middle area of ​​the outer wall of the condenser.

[0036] Specifically, the coolant fluid in the inner middle area of ​​the condenser tube in the condenser 13 is a gas-liquid mixed state, that is, the coolant fluid in the inner middle area of ​​the condenser tube in the condenser 13 is in a saturated state, and the temperature and pressure of the coolant fluid in the saturated state can correspond one to one, and the temperature sensor 20 is arranged in the middle area 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 to obtain a first temperature value, and then the temperature of the coolant fluid in the middle area in the condenser tube can be calculated according to the first temperature value to obtain a second temperature value, and then the pressure of the coolant fluid in the condenser tube can be calculated according to the second temperature value to obtain a second pressure value, and then the pressure of the coolant fluid at the inlet of the condenser tube can be calculated according to 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. Furthermore, the temperature sensor 20 can be set in the middlemost area of ​​the outer wall of the condenser, so that the calculation of the pressure of the coolant fluid at the inlet of the condenser is more accurate, which is conducive to improving the control accuracy, thereby ensuring the reliability of the operation of the entire air-conditioning system.

[0038] Figure 2 is a flow chart of a control method of an air conditioning system provided by the present disclosure, with reference to Figure 2 This embodiment provides a control method for an air conditioning system for a vehicle, the air conditioning system comprising a closed circulation system and a temperature sensor, the closed circulation system comprising a compressor and a condenser connected by a refrigerant pipeline, a coolant fluid is arranged in the refrigerant pipeline, and the temperature sensor is arranged on the outer wall of a condenser tube in the condenser; the control method comprises:

[0039] Step S10, obtaining the temperature of the outer wall of the condenser to obtain a first temperature value;

[0040] Step S20, calculating the pressure of the coolant fluid at the inlet of the condenser according to the first temperature value to obtain a first pressure value;

[0041] Step S30: Control the state of the compressor according to the first pressure value.

[0042] For details, please refer to 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 the present disclosure. In the air-conditioning system provided in the embodiment of the present disclosure, the temperature sensor 20 is arranged 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 to obtain a first temperature value, and then the pressure of the coolant fluid at the inlet of the condenser tube can be calculated according to the first temperature value to obtain a first pressure value, and then the state of the compressor 12 can be controlled according to the first pressure value, with high control accuracy, thereby ensuring the reliability of the operation of the entire air-conditioning system.

[0043] At the same time, the pressure of the coolant fluid at the inlet of the condenser can be calculated according to the first temperature value to obtain the first pressure value, and then the state of the compressor 12 can be controlled according to the first pressure value. That is, it is only necessary to set a temperature sensor 20 on the outer wall of the condenser in the condenser 13. The pressure of the coolant fluid at the inlet of the condenser can be calculated according to the first temperature value collected by the temperature sensor 20, and the state of the compressor 12 can be controlled according to the pressure of the coolant fluid at the inlet of the condenser. There is no need to set a pressure sensor at the inlet of the condenser in the condenser 13, and the cost of the temperature sensor 20 is much smaller than the cost of the pressure sensor, thereby effectively reducing the production cost.

[0044] Figure 3 is a flow chart of step S20 in the air conditioning system control method provided by the present disclosure, refer to Figure 2 and Figure 3 In some optional embodiments, step S20, calculating the pressure of the coolant fluid at the inlet of the condenser according to the first temperature value, and obtaining the first pressure value includes:

[0045] Step S21, calculating the pressure of the coolant fluid in the condenser according to the first temperature value to obtain a second pressure value;

[0046] Step S22, obtaining the pressure loss between the pressure of the coolant fluid in the condenser and the pressure of the coolant fluid at the inlet of the condenser;

[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 in the condenser is calculated according to the first temperature value, and the pressure loss between the pressure of the coolant fluid in the condenser and the pressure of the coolant fluid at the inlet of the condenser is obtained at the same time, and 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 is obtained by adding the pressure loss between the pressure of the coolant fluid in the condenser and the pressure of the coolant fluid at the inlet of the condenser. Then, the state of the compressor 12 can be controlled according to the pressure of the coolant fluid at the inlet of the condenser, with high control accuracy, thereby ensuring the reliability of the operation of the entire air-conditioning system.

[0049] Figure 4 is a flow chart of step S21 in the air conditioning system control method provided by the present disclosure, refer to Figure 2-Figure 4 In some optional embodiments, step S21, calculating the pressure of the coolant fluid in the condenser according to the first temperature value to obtain the second pressure value includes:

[0050] Step S211, calculating the temperature of the coolant fluid in the condenser according to the first temperature value to obtain a second temperature value;

[0051] Step S212: Obtain a second pressure value according to the second temperature value.

[0052] Specifically, the temperature of the coolant fluid in the condenser is calculated according to 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 correspond one to one, that is, the second temperature value and the second pressure value correspond one to one, so that the second pressure value can be obtained according to the second temperature value.

[0053] Exemplarily, the corresponding relationship between the second temperature value t2 and the second pressure value P2 can be referred to Table 1.

[0054] Table 1

[0055]

[0056]

[0057]

[0058] It should be noted that Table 1 only exemplarily shows a 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 a calibration test value, which can be tested according to a specific vehicle.

[0059] Continue to refer Figure 2-Figure 4 In some optional embodiments, step S211, calculating the temperature of the coolant fluid in the condenser according to the first temperature value to obtain the second temperature value includes:

[0060] Acquire the ambient air temperature to obtain a third temperature value;

[0061] The second temperature value is obtained according to 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.

[0062] Specifically, according to the heat transfer equation, it can be obtained that: Φ1=AK1(t2-t1) and Φ2=AK2(t1-t3), wherein Φ1 is the heat flow of the coolant fluid to the tube wall of the condenser, Φ2 is the heat flow 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 tube wall of the condenser, K2 is the heat transfer coefficient of the condenser tube wall to the air. According to the law of conservation of energy, in the air-conditioning system, the heat of the coolant fluid is taken away by the air, so the heat transferred by the coolant fluid to the tube wall of the condenser is equal to the heat transferred by the tube wall of the condenser to the air, that is, Φ1=Φ2, so it can be obtained: Based on this formula, the temperature of the coolant fluid in the condenser 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 and the heat transfer coefficient K2 of the tube wall of the condenser to the air to obtain the second temperature value t2.

[0063] In some optional embodiments, the control method further includes:

[0064] The heat transfer coefficient of the coolant fluid to the tube wall of the condenser tube is obtained according to 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 tube correspond one to one, so the heat transfer coefficient of the coolant fluid to the tube wall of the condenser tube can be obtained according to the flow rate of the coolant fluid.

[0066] For example, the corresponding 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 tube can be referred to 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 exemplifies the correspondence between the flow rate of the coolant fluid and the heat transfer coefficient of the coolant fluid to the tube wall of the condenser. Table 2 is only for illustrative purposes. The correspondence between the flow rate of the coolant fluid and the heat transfer coefficient of the coolant fluid to the tube wall of the condenser belongs to the calibrated test value, which can be tested according to the specific vehicle.

[0070] In some optional embodiments, the control method further includes:

[0071] The heat transfer coefficient of the condenser tube wall to the air is obtained according to the vehicle speed.

[0072] Specifically, the vehicle speed and the heat transfer coefficient of the tube wall of the condenser to the air correspond one to one, so the heat transfer coefficient of the tube wall of the condenser to the air can be obtained according to the vehicle speed.

[0073] For example, the corresponding relationship between the vehicle speed and the heat transfer coefficient of the condenser tube wall to the air can be referred to in Table 3.

[0074] Table 3

[0075] 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 exemplifies the correspondence between the vehicle speed and the heat transfer coefficient of the condenser wall to the air. Table 3 is only for illustrative purposes. The correspondence between the vehicle speed and the heat transfer coefficient of the condenser wall to the air belongs to the calibration test value, which can be tested according to the specific vehicle.

[0077] In some optional embodiments, the closed cycle system 10 may further include an expansion valve 14 , wherein the compressor 12 , the condenser 13 and the expansion valve 14 are sequentially connected via a refrigerant pipeline 11 .

[0078] Of course, in other embodiments of the present disclosure, the air conditioning system may further include other components, which will not be described in detail herein.

[0079] The control method also includes:

[0080] The flow rate of the coolant fluid is obtained according to the rotation speed of the compressor and the opening of the expansion valve.

[0081] Specifically, the flow rate of the coolant fluid is related to the rotation speed of the compressor and the opening degree of the expansion valve, so the flow rate of the coolant fluid can be obtained according to the rotation speed of the compressor and the opening degree of the expansion valve.

[0082] For example, the corresponding relationship between the flow rate of the coolant fluid, the rotation speed of the compressor, and the opening degree of the expansion valve can be referred to 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] Among them, the value in the first row of Table 4 is the rotation speed of the compressor (in rpm), the value in the first column of Table 4 is the opening of the expansion valve, and the remaining values ​​are the flow rates of the corresponding coolant fluid (in kg / h).

[0086] It should be noted that Table 4 only exemplifies a corresponding relationship between the flow rate of the coolant fluid, the rotational speed of the compressor, and the opening of the expansion valve. Table 4 is only for illustrative purposes. The corresponding relationship between the flow rate of the coolant fluid, the rotational speed of the compressor, and the opening of the expansion valve belongs to a calibrated test value, which can be tested according to the specific vehicle.

[0087] The above description is only a preferred embodiment of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present disclosure (but not limited to) by each other to form a technical solution.

[0088] In addition, although each operation is described in a specific order, this should not be understood as requiring these operations to be performed in the specific order shown or in a sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present disclosure. Some features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination mode.

[0089] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, 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. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

[0090] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be 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 the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An air conditioning system for a vehicle, characterized in that: include: A closed circulation system, the closed circulation system comprising a compressor and a condenser connected by a refrigerant pipeline, wherein a coolant fluid is arranged in the refrigerant pipeline; A temperature sensor, wherein the temperature sensor is arranged on the outer wall of the condenser tube in the condenser; a calculation unit, the calculation unit being used to obtain a first temperature value collected by the temperature sensor, and calculate the pressure of the coolant fluid at the inlet of the condenser according to the first temperature value to obtain a first pressure value; A control unit is used to obtain the first pressure value and control the state of the compressor according to the first pressure value.

2. The air conditioning system according to claim 1, characterized in that: The temperature sensor is arranged in the middle area of ​​the outer wall of the condenser.

3. A control method for an air conditioning system of a vehicle, characterized in that: The air conditioning system comprises a closed circulation system and a temperature sensor, wherein the closed circulation system comprises a compressor and a condenser connected by a refrigerant pipeline, a coolant fluid is arranged in the refrigerant pipeline, and the temperature sensor is arranged on the outer wall of a condenser tube in the condenser; the control method comprises: Acquire the temperature of the outer wall of the condenser to obtain a first temperature value; Calculating the pressure of the coolant fluid at the inlet of the condenser according to the first temperature value to obtain a first pressure value; The state of the compressor is controlled according to the first pressure value.

4. The control method according to claim 3, characterized in that: Calculating the pressure of the coolant fluid at the inlet of the condenser according to the first temperature value to obtain the first pressure value includes: Calculate the pressure of the coolant fluid in the condenser according to the first temperature value to obtain a second pressure value; Obtaining a pressure loss between a pressure of the coolant fluid in the condenser tube and a pressure of the coolant fluid at an inlet of the condenser tube; The second pressure value and the pressure loss are combined to obtain the first pressure value.

5. The control method according to claim 4, characterized in that: Calculating the pressure of the coolant fluid in the condenser according to the first temperature value to obtain a second pressure value includes: Calculate the temperature of the coolant fluid in the condenser tube according to the first temperature value to obtain a second temperature value; The second pressure value is acquired according to the second temperature value.

6. The control method according to claim 5, characterized in that: Calculating the temperature of the coolant fluid in the condenser according to the first temperature value to obtain a second temperature value includes: Acquire the ambient air temperature to obtain a third temperature value; The second temperature value is obtained according to 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.

7. The control method according to claim 6, characterized in that: Also includes: The heat transfer coefficient of the coolant fluid to the tube wall of the condenser tube is obtained according to the flow rate of the coolant fluid.

8. The control method according to claim 6, characterized in that: Also includes: The heat transfer coefficient of the tube wall of the condenser to the air is obtained according to the speed of the vehicle.

9. The control method according to claim 4, characterized in that: Also includes: 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 is obtained according to the flow rate of the coolant fluid.

10. The control method according to claim 7 or 9, characterized in that: The closed circulation system also includes an expansion valve; The control method further comprises: The flow rate of the coolant fluid is obtained according to the rotation speed of the compressor and the opening degree of the expansion valve.

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