Control circuit of electronic expansion valve, air conditioning system, vehicle, method and medium

Abstract

The application relates to the technical field of vehicles, in particular to a control circuit of an electronic expansion valve, an air conditioning system, a vehicle, a method and a medium, wherein the circuit comprises: an electronic expansion valve; a signal adjusting circuit used for boosting and amplifying a control signal; a controller used for generating the control signal according to the temperature and pressure of refrigerant flowing into and out of the electronic expansion valve of the vehicle air conditioning system, inputting the control signal into the signal adjusting circuit, and controlling the electronic expansion valve based on the control signal boosted and amplified by the signal adjusting circuit. Therefore, the problems of reverse flow overload and the like of the circuit of the electronic expansion valve in the related art are solved.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a control circuit for an electronic expansion valve, an air conditioning system, a vehicle, a method, and a medium. Background Technology

[0002] Automotive air conditioning systems generally consist of a compressor, electronically controlled clutch, condenser, evaporator, electronic expansion valve, receiver-drier, piping, condenser fan, vacuum solenoid valve, idle speed control, and control system. The automotive air conditioning system is a device that cools, heats, ventilates, and purifies the air inside the vehicle.

[0003] Among them, the electronic expansion valve uses the electrical signal generated by the regulated parameter to control the voltage or current applied to the expansion valve, thereby achieving the purpose of regulating the refrigerant supply. In different environments, the valve needle in the electronic expansion valve needs to be driven. The coil generates a magnetic field through the current and acts on the valve needle. By driving the valve needle to rotate, the flow rate of refrigerant and the amount of cooling and heating in the system are controlled. However, the control circuit of the air conditioning system in related technologies cannot effectively regulate and process the control signal. The circuit is prone to backflow overload, unstable transmission after signal amplification, and inability to effectively remove low-frequency signals. Summary of the Invention

[0004] This application provides a control circuit for an electronic expansion valve, an air conditioning system, a vehicle, a method, and a medium to solve problems such as backflow overload in the circuit of electronic expansion valves in related technologies.

[0005] The first aspect of this application provides a control circuit for an electronic expansion valve, comprising: an electronic expansion valve; a signal conditioning circuit for boosting and amplifying a control signal; and a controller for generating a control signal based on the temperature and pressure of the refrigerant flowing into and out of the electronic expansion valve from the vehicle's air conditioning system, inputting the control signal into the signal conditioning circuit, and controlling the electronic expansion valve based on the boosted and amplified control signal from the signal conditioning circuit.

[0006] Optionally, the signal conditioning circuit includes an inductor boost circuit and a signal amplification circuit, wherein the inductor boost circuit is used to boost the control signal; and the signal amplification circuit is used to amplify the boosted control signal.

[0007] Optionally, the inductor boost circuit includes: a first switch, a transformer, a first diode, a second diode, a first transistor, a first resistor, a second resistor, a first capacitor, and a second capacitor connected in series with the vehicle's power supply. The output terminal of the first switch is connected in parallel with the collector of the first transistor and the first resistor through the transformer. The first resistor is connected in series with the base of the first transistor. The emitter of the first transistor is electrically connected to the power supply. The output terminal of the transformer is connected in series with the first diode. The first capacitor and the second resistor are connected in parallel with the first diode. The second diode and the second capacitor are connected in parallel with the second resistor.

[0008] Optionally, the transformer is a double-winding transformer with a shielded core.

[0009] Optionally, the signal amplification circuit includes: third to fifth capacitors, third to seventh resistors, and a second transistor. One end of the third capacitor is connected to the power input terminal of the vehicle. The other end of the third capacitor is connected in parallel with the third resistor, in series with the fourth resistor, the fifth resistor, and the base of the second transistor. One end of the fifth resistor is connected in parallel with the fourth capacitor, the sixth resistor, and the collector of the second transistor. The emitter output terminal of the second transistor is connected in parallel with the seventh resistor and the fifth capacitor. The seventh resistor is grounded.

[0010] Optionally, a working voltage terminal is formed between the fourth and fifth resistors, and a voltage output terminal is formed across the six resistors.

[0011] A second aspect of this application provides an air conditioning system including a control circuit for an electronic expansion valve as described in the above embodiments.

[0012] A third aspect of this application provides a vehicle including an air conditioning system as described in the above embodiments.

[0013] The fourth aspect of this application provides a control method for an electronic expansion valve, comprising the following steps: acquiring the temperature and pressure of refrigerant flowing into and out of the electronic expansion valve from the vehicle's air conditioning system; generating a control signal for the electronic expansion valve based on the temperature and pressure; inputting the control signal to a signal conditioning circuit; and controlling the electronic expansion valve based on the control signal boosted and amplified by the signal conditioning circuit.

[0014] A fifth aspect of this application provides a computer-readable storage medium having a computer program or instructions stored thereon, which are executed by a processor to perform the control method of the electronic expansion valve as described above.

[0015] Therefore, this application has at least the following beneficial effects:

[0016] This application embodiment uses a signal conditioning circuit to boost and amplify the control signal, enabling the controller to control the electronic expansion valve based on the boosted and amplified control signal. This allows for effective regulation of the control signal, preventing reverse current overload in the circuit. Furthermore, boosting and amplifying the control signal enhances signal strength and quality, achieving more precise control of the electronic expansion valve. Therefore, it solves the technical problems of reverse current overload in electronic expansion valve circuits in related technologies.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0019] Figure 1 A schematic diagram of the control circuit of the electronic expansion valve provided according to an embodiment of this application;

[0020] Figure 2 This is a circuit diagram of an inductor boost circuit provided according to an embodiment of this application;

[0021] Figure 3 This is a circuit diagram of a signal amplification circuit provided according to an embodiment of this application;

[0022] Figure 4 This is a schematic diagram of a vehicle air conditioning system provided according to an embodiment of this application;

[0023] Figure 5 A flowchart of a control method for an electronic expansion valve according to an embodiment of this application;

[0024] Figure 6 This is a flowchart illustrating the control method for an electronic expansion valve provided according to an embodiment of this application. Detailed Implementation

[0025] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, 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 this application, and should not be construed as limiting this application.

[0026] The control circuit of the electronic expansion valve, an air conditioning system, a vehicle, a method, and a medium according to embodiments of this application are described below with reference to the accompanying drawings. Addressing the problems mentioned in the background section regarding the control circuits of air conditioning systems, such as ineffective regulation of control signals, susceptibility to backflow overload, unstable signal transmission after amplification, and inability to effectively remove low-frequency signals, this application provides a control circuit for an electronic expansion valve. In this method, the control signal can be boosted and amplified by a signal conditioning circuit, enabling the controller to control the electronic expansion valve based on the boosted and amplified control signal. This effectively regulates the control signal and prevents backflow overload. Therefore, the problems of backflow overload in the circuits of electronic expansion valves in related technologies are solved.

[0027] Specifically, Figure 1 This is a schematic diagram of a control circuit for an electronic expansion valve provided in an embodiment of this application.

[0028] like Figure 1 As shown, the control circuit 10 of the electronic expansion valve includes: an electronic expansion valve 11, a signal conditioning circuit 12, and a controller 13.

[0029] The signal conditioning circuit 12 is used to boost and amplify the control signal; the controller 13 generates a control signal based on the temperature and pressure of the refrigerant flowing into and out of the electronic expansion valve of the vehicle air conditioning system, inputs the control signal into the signal conditioning circuit 12, and controls the electronic expansion valve 13 based on the boosted and amplified control signal of the signal conditioning circuit 12.

[0030] It is understood that the embodiments of this application can boost and amplify the control signal through the signal conditioning circuit 12, so that the controller 13 can control the electronic expansion valve 13 based on the boosted and amplified control signal, thereby enabling effective regulation and processing of the control signal and avoiding the circuit from being prone to reverse current overload.

[0031] It should be noted that the control signal in this embodiment is an electrical signal, which can be a voltage signal.

[0032] In this embodiment, the signal conditioning circuit 12 includes an inductor boost circuit and a signal amplification circuit.

[0033] The inductor boost circuit is used to boost the control signal; the signal amplifier circuit is used to amplify the boosted control signal.

[0034] It is understood that the signal conditioning circuit 12 in this embodiment is divided into two parts: an inductor boost circuit for boosting the control signal and a signal amplification circuit for amplifying the boosted control signal. The specific circuit structure is described in the following embodiments.

[0035] In this embodiment of the application, the inductor boost circuit includes: a first switch connected in series with the vehicle's power supply, a transformer, a first diode, a second diode, a first transistor, a first resistor, a second resistor, a first capacitor, and a second capacitor.

[0036] In this circuit, the output terminal of the first switch is connected in parallel with the collector of the first transistor and the first resistor via a transformer. The first resistor is connected in series with the base of the first transistor. The emitter of the first transistor is electrically connected to the power supply. The output terminal of the transformer is connected in series with the first diode. A first capacitor and a second resistor are connected in parallel with the first diode. A second diode and a second capacitor are connected in parallel with the second resistor. The transformer is a double-winding iron-core transformer with a shielding layer.

[0037] Specifically, an inductor boost circuit, such as Figure 2 As shown, the inductor boost circuit includes a switch SA connected in series with the power supply. The output terminal of the switch SA is connected in parallel with the collector of the first transistor VT1 and the first resistor R1 through a grounded transformer T. The first resistor R1 is connected in series with the base of the first transistor VT1. The emitter of the first transistor VT1 is electrically connected to the power supply. The output terminal of the transformer T is connected in series with the first diode D1. The first capacitor C1 and the second resistor R2 are connected in parallel with the first diode D1. The second diode D2 and the second capacitor C2 are connected in parallel with the second resistor R2.

[0038] The working principle of the inductor boost circuit is as follows: the pressure sensor and temperature sensor provide the processor with corresponding sensing data, which is then controlled by the controller to increase the voltage of the inductor boost circuit. The circuit also provides feedback on the sensing data of the fluid flow, thus precisely controlling the required regulating voltage. In the inductor boost circuit, the voltage is boosted through a transformer T at switch SA. The first transistor VT1 connected in parallel with transformer T amplifies the weak signal into a larger amplitude electrical signal, ensuring stable transmission of the boosted signal. The positive voltage signal at the output of the first resistor R1 is connected to the base of the first transistor VT1, which transmits this signal to the emitter and collector, thus putting the transistor in a conducting state. Transformer T transmits the electrical signal to the first diode D1, which provides unidirectional conductivity and prevents reverse current. The second diode D2 on the second resistor R2 is essentially a Zener diode, providing voltage regulation. The signal is then coupled through the second capacitor C2, preventing interference between the preceding and following circuit stages during static operation.

[0039] In the inductor boost circuit, the power is amplified at the base of the first transistor VT1, which is connected through the first resistor R1, forming a primary boost voltage. Then, under the action of the transformer T, the voltage is boosted to reach the voltage value required by the electrical device. Through the secondary boost operation, the stability of the voltage transmission is ensured. At the same time, the first capacitor C1 connected in parallel with the first diode D1 can play a filtering role, filtering out signals that are not needed for the frequency band, thereby retaining the set frequency signal.

[0040] In this embodiment, the signal amplification circuit includes: third to fifth capacitors, third to seventh resistors, and a second transistor.

[0041] One end of the third capacitor is connected to the power input terminal of the vehicle. The other end of the third capacitor is connected in parallel with the third resistor, in series with the fourth resistor, the fifth resistor, and the base of the second transistor. One end of the fifth resistor is connected in parallel with the fourth capacitor, the sixth resistor, and the collector of the second transistor. The emitter output terminal of the second transistor is connected in parallel with the seventh resistor and the fifth capacitor. The seventh resistor is connected to the fourth resistor and the fifth resistor to form a working voltage terminal. The two ends of the sixth resistor form a voltage output terminal.

[0042] Specifically, signal amplification circuits such as Figure 3 As shown, the signal amplification circuit includes a third capacitor C3 connected to the power input terminal. The output terminal of the third capacitor C3 is connected in parallel with a third resistor R3, a fourth resistor R4 and a fifth resistor R5 connected in series, and the base of the second diode D2. The fifth resistor R5 is connected in parallel with a fourth capacitor C4 and a sixth resistor R6 connected in series, and the collector of the second transistor D2. The emitter output terminal of the second transistor D2 is connected in parallel with a seventh resistor R7 for grounding protection and a fifth capacitor C5. A working voltage terminal is formed between the fourth resistor R4 and the fifth resistor R5, and a voltage output terminal is formed across the sixth resistor R6.

[0043] The working principle of the signal amplifier circuit is as follows: the third capacitor C3 is the input capacitor, the fourth capacitor C4 is the output capacitor, the second transistor VT2 is the amplification device, the fourth resistor R4 is the base bias resistor, which determines whether the second transistor VT2 is in the conducting state, the fifth resistor R5 is the collector load resistor, the collector is the power supply terminal of the second transistor VT2, it provides current to the second transistor VT2 for operation, and a seventh resistor R7 and a fifth capacitor C5 are added to the emitter. The fifth capacitor C5 is called the AC bypass capacitor, which is short-circuited for AC. A current branch can be extended to allow the amplified high-frequency signal to pass through while blocking the low-frequency DC signal. The seventh resistor R7 has a DC negative feedback function. In the signal amplification circuit, the output signal amplified by the second transistor VT2 is fed back to the signal input terminal through the AC bypass capacitor, realizing DC negative feedback of the signal. The actual input voltage of the base of the second transistor VT2 is the difference between the voltage on the third resistor R3 and the voltage on the seventh resistor R7, so it is negative feedback. Due to the above two measures, the stability of the circuit operation is improved.

[0044] Since the output voltage of R7 is the common point of the input and output voltages, the output of the seventh resistor R7 is grounded for effective overload protection. The working voltage terminal formed between resistors R4 and R5 can be used as a voltage measurement point to detect whether it is within the normal working voltage range, thus ensuring the normal operation of the circuit. The fourth capacitor C4 can act as a filter, essentially a filter capacitor, to filter out signals that are not needed for the frequency band, thereby retaining the required frequency signal and outputting the amplified signal stably.

[0045] In summary, the inductor boost circuit can not only boost the control signal but also stabilize it, and it can also filter out signals that are not needed in the desired frequency band, thus retaining the signal of the set frequency. The signal amplification circuit can not only amplify the control signal but also stabilize it. Therefore, the control circuit of the electronic expansion valve of this application can effectively regulate the control signal, avoid reverse current overload in the circuit, make the signal transmission more stable after amplification, and effectively remove low frequency signals.

[0046] According to the control circuit of the electronic expansion valve proposed in the embodiments of this application, the control signal can be boosted and amplified by the signal conditioning circuit, so that the controller can control the electronic expansion valve based on the boosted and amplified control signal. This enables effective regulation of the control signal, avoids the circuit from being prone to reverse current overload, and boosting and amplifying the control signal can enhance the signal strength and signal quality, thereby achieving more precise control of the electronic expansion valve.

[0047] This application also provides an air conditioning system, including the control circuit of the electronic expansion valve as described above.

[0048] This application also provides a vehicle including the air conditioning system described above.

[0049] Specifically, the power source of the vehicle's air conditioning system in this application embodiment can be electricity. The refrigerant, with the help of an electric compressor, condenser, expansion valve and evaporator, goes through four stages of compression, heat release, throttling and heat absorption to dissipate the heat inside the vehicle to the outside, thereby achieving the purpose of lowering the temperature inside the vehicle. When it is necessary to raise the temperature inside the vehicle, the blower delivers the heat released by the condenser to the vehicle. The low-temperature and low-pressure gaseous refrigerant is liquefied into a low-temperature and low-pressure liquid refrigerant through the heat exchanger outside the vehicle, absorbing heat from the external environment, thereby forming a cooling process.

[0050] The specific structure of the vehicle's air conditioning system is as follows: Figure 4 As shown, it includes: an electric compressor 1, an in-vehicle heat exchanger 2, an electronic expansion valve 11, and an external heat exchanger 3.

[0051] Among them, the electric compressor 1 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant. Then, the high-temperature and high-pressure gaseous refrigerant is condensed and released heat by the in-vehicle heat exchanger 2 and becomes a low-temperature and high-pressure liquid refrigerant. The low-temperature and high-pressure liquid refrigerant is then delivered to the electronic expansion valve 11.

[0052] The electronic expansion valve 11 is used to reduce the pressure of the low-temperature, high-pressure liquid refrigerant to a low-temperature, low-pressure gaseous refrigerant through vaporization and deliver it to the external heat exchanger 3. The low-temperature, low-pressure gaseous refrigerant evaporates and absorbs heat to become a low-temperature, low-pressure gaseous refrigerant, which is then delivered back to the electric compressor 1. The heat dissipated by the high-temperature, high-pressure gaseous refrigerant after condensation in the internal heat exchanger 2 is delivered to the vehicle interior by a blower, thus constituting a heating process. The low-temperature, low-pressure gaseous refrigerant evaporates and absorbs heat in the external heat exchanger 3, thus cooling the vehicle interior, thus constituting a cooling process.

[0053] Furthermore, this application can utilize a hybrid system for cooling or heating. When the power source is the engine compartment, the engine compartment releases high-temperature, low-pressure gaseous refrigerant and delivers it to the compressor. The compressor compresses the high-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant and delivers it to the condenser. The condenser converts the high-temperature, high-pressure gaseous refrigerant into a low-temperature, high-pressure liquid refrigerant after heat exchange and delivers it to the receiver-dryer. The receiver-dryer absorbs moisture and purifies the low-temperature, high-pressure liquid refrigerant and delivers it to the expansion valve. The expansion valve depressurizes the low-temperature, high-pressure liquid refrigerant into a low-temperature, low-pressure gaseous refrigerant through vaporization and delivers it to the evaporator. The evaporator absorbs heat from the low-temperature, high-pressure liquid refrigerant, converting it into a low-temperature, low-pressure liquid refrigerant, and delivers it to the engine compartment to absorb heat. The low-temperature, low-pressure liquid refrigerant is then converted into a high-temperature, high-pressure gaseous refrigerant, completing one cycle in the system.

[0054] In an electric vehicle, the battery powers the electric compressor 1, which compresses the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. This high-temperature, high-pressure gaseous refrigerant then flows into the condenser through a four-way reversing valve. The heat released by the condenser after condensation is delivered to the vehicle interior via a blower, thus initiating a heating process. The high-temperature, high-pressure gaseous refrigerant is then condensed into a low-temperature, high-pressure liquid refrigerant by the evaporator. After being throttled and depressurized by the expansion valve, it becomes a low-temperature, low-pressure gas-liquid mixture refrigerant. This mixture evaporates and absorbs heat in the evaporator, becoming a low-temperature, low-pressure gaseous refrigerant. This process cools the vehicle interior. The gaseous refrigerant is then purified and dried in a liquid receiver-drier before being returned to the electric compressor 1, completing a cycle.

[0055] Next, the control method of the electronic expansion valve according to the embodiments of this application is described with reference to the accompanying drawings.

[0056] Figure 5 This is a flowchart of the control method for the electronic expansion valve according to an embodiment of this application.

[0057] like Figure 5 As shown, the control method for this electronic expansion valve includes the following steps:

[0058] In step S101, the temperature and pressure of the refrigerant flowing into and out of the electronic expansion valve of the vehicle's air conditioning system are obtained.

[0059] Temperature and pressure can be measured by temperature sensors and pressure sensors, respectively.

[0060] In step S102, a control signal for the electronic expansion valve is generated based on temperature and pressure.

[0061] It is understood that the embodiments of this application can generate control signals for the electronic expansion valve based on temperature and pressure. The control signals include signals that drive the valve needle in the electronic expansion valve to regulate the flow rate of liquid refrigerant, refrigeration, etc.

[0062] In step S103, a control signal is input to the signal conditioning circuit, and the electronic expansion valve is controlled based on the control signal after being boosted and amplified by the signal conditioning circuit.

[0063] It is understood that, in the embodiments of this application, a control signal can be input to a signal conditioning circuit, and the electronic expansion valve can be controlled based on the control signal boosted and amplified by the signal conditioning circuit, wherein the signal conditioning circuit is used to boost and amplify the control signal.

[0064] It should be noted that the foregoing explanation of the control circuit embodiment of the electronic expansion valve also applies to the control method of the electronic expansion valve in this embodiment, and will not be repeated here.

[0065] The control method of the electronic expansion valve of this application is described below through a specific embodiment, such as... Figure 6 As shown, it includes the following steps:

[0066] S1.1: The temperature and pressure values ​​of the refrigerant flowing into / out of the electronic expansion valve are collected by temperature and pressure sensors, and the temperature and pressure values ​​are transmitted to the processor (equivalent to the controller of this application);

[0067] S1.2: The processor is powered by a battery connected to the charger. At the same time, the processor controls the connected inductor boost circuit to boost the voltage and transmit the electrical signal to the signal amplification circuit.

[0068] S1.3: The signal amplification circuit amplifies the electrical signal and transmits the amplified electrical signal to the electronic expansion valve.

[0069] S1.4: The electronic expansion valve converts the low-temperature, high-pressure liquid refrigerant into a low-temperature, low-pressure gaseous refrigerant through flow regulation and vaporization.

[0070] According to the control method of the electronic expansion valve proposed in the embodiments of this application, a control signal can be generated based on the temperature and pressure of the refrigerant flowing into and out of the electronic expansion valve of the vehicle air conditioning system, and then the control signal is transmitted to the signal conditioning circuit. The electronic expansion valve is controlled based on the control signal after being boosted and amplified by the signal conditioning circuit, which can enhance the strength and quality of the control signal and achieve more precise control of the electronic expansion valve.

[0071] This application also provides a computer-readable storage medium storing a computer program or instructions thereon, which, when executed by a processor, implements the above-described control method for an electronic expansion valve.

[0072] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0073] 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 at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0074] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0075] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or more of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0076] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

Claims

1. A control circuit for an electronic expansion valve, characterized in that, Includes the following steps: Electronic expansion valve; Signal conditioning circuit, used to boost and amplify control signals; The signal conditioning circuit includes an inductor boost circuit and a signal amplification circuit, wherein the inductor boost circuit is used to boost the control signal; and the signal amplification circuit is used to amplify the boosted control signal. The controller generates control signals based on the temperature and pressure of the refrigerant flowing into and out of the electronic expansion valve of the vehicle's air conditioning system, inputs the control signals into the signal conditioning circuit, and controls the electronic expansion valve based on the control signals boosted and amplified by the signal conditioning circuit.

2. The control circuit of the electronic expansion valve according to claim 1, characterized in that, The inductor boost circuit includes: a first switch connected in series with the vehicle's power supply, a transformer, a first diode, a second diode, a first transistor, a first resistor, a second resistor, a first capacitor, and a second capacitor, wherein... The output terminal of the first switch is connected in parallel with the collector of the first transistor and the first resistor through a transformer. The first resistor is connected in series with the base of the first transistor. The emitter of the first transistor is electrically connected to the power supply. The output terminal of the transformer is connected in series with the first diode. The first capacitor and the second resistor are connected in parallel with the first diode. The second diode and the second capacitor are connected in parallel with the second resistor.

3. The control circuit of the electronic expansion valve according to claim 2, characterized in that, The transformer is a double-winding iron core transformer with a shielding layer.

4. The control circuit of the electronic expansion valve according to claim 1, characterized in that, The signal amplification circuit includes: third to fifth capacitors, third to seventh resistors, and a second transistor, wherein... One end of the third capacitor is connected to the power input terminal of the vehicle. The other end of the third capacitor is connected in parallel with the third resistor, in series with the fourth resistor, the fifth resistor, and the base of the second transistor. One end of the fifth resistor is connected in parallel with the fourth capacitor, the sixth resistor, and the collector of the second transistor. The emitter output terminal of the second transistor is connected in parallel with the seventh resistor and the fifth capacitor. The seventh resistor is grounded.

5. The control circuit of the electronic expansion valve according to claim 4, characterized in that, A working voltage terminal is formed between the fourth resistor and the fifth resistor, and a voltage output terminal is formed at both ends of the sixth resistor.

6. An air conditioning system, characterized in that, Includes the control circuit of the electronic expansion valve as described in any one of claims 1-5.

7. A vehicle, characterized in that, Including the air conditioning system as described in claim 6.

8. A control method for an electronic expansion valve, characterized in that, Includes the following steps: The temperature and pressure of the refrigerant flowing into and out of the electronic expansion valve of the vehicle's air conditioning system are obtained. The control signal for the electronic expansion valve is generated based on the temperature and the pressure. The control signal is input to the signal conditioning circuit, and the electronic expansion valve is controlled based on the control signal after being boosted and amplified by the signal conditioning circuit. The signal conditioning circuit includes an inductor boost circuit and a signal amplification circuit. The inductor boost circuit is used to boost the control signal, and the signal amplification circuit is used to amplify the boosted control signal.

9. A computer-readable storage medium having a computer program or instructions stored thereon, characterized in that, The computer program or instructions are executed by a processor to implement the control method for the electronic expansion valve as described in claim 8.

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