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

Abstract

The invention 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. The signal conditioning circuit is used for boosting and amplifying the control signal; and the controller is used for generating a control signal according to the temperature and pressure when the refrigerant of the vehicle air conditioning system flows into and out of the electronic expansion valve, inputting the control signal into the signal conditioning circuit, and controlling the electronic expansion valve based on the control signal boosted and amplified by the signal conditioning circuit. Therefore, the problem that countercurrent overload is prone to occurring in a circuit of the electronic expansion valve in the related technology is solved.

Description

Technical Field

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

[0002] Automobile air conditioners are generally composed of a compressor, an electronically controlled clutch, a condenser, an evaporator, an electronic expansion valve, a liquid storage dryer, pipes, a condensing fan, a vacuum solenoid valve, an idler and a control system. The automobile air conditioning system is a device that realizes cooling, heating, ventilating and purifying the air in the vehicle compartment.

[0003] Among them, the electronic expansion valve uses the electrical signal generated by the adjusted parameter to control the voltage or current applied to the expansion valve, thereby achieving the purpose of adjusting the liquid supply. Under different environments, the valve needle in the electronic expansion valve needs to be driven, and 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 in the system and the amount of cooling and heat are controlled. However, the control circuit of the air-conditioning system in the related technology cannot effectively adjust the control signal. The circuit is prone to reverse overload, the transmission of the signal is not stable after amplification, and the low-frequency signal cannot be effectively removed. Summary of the invention

[0004] The present application provides a control circuit of an electronic expansion valve, an air conditioning system, a vehicle, a method and a medium to solve the problem that the circuit of the electronic expansion valve in the related art is prone to reverse flow overload and the like.

[0005] A first aspect of the present 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; a controller for generating a control signal according to the temperature and pressure of a refrigerant of a vehicle air-conditioning system when it flows into and out of the electronic expansion valve, respectively, inputting the control signal into the signal conditioning circuit, and controlling the electronic expansion valve based on the control signal boosted and amplified by the signal conditioning circuit.

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

[0007] Optionally, the inductive 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 a power supply of the vehicle, wherein the output end 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 to the base of the first transistor, the emitter of the first transistor is electrically connected to the power supply, the output end of the transformer is connected in series to the first diode, the first diode is connected in parallel with the first capacitor and the second resistor, and the second resistor is connected in parallel with the second diode and the second capacitor.

[0008] Optionally, the transformer is an iron core double-winding transformer with a shielding layer.

[0009] Optionally, 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, and the seventh resistor is grounded.

[0010] Optionally, a working voltage terminal is formed between the fourth resistor and the fifth resistor, and voltage output terminals are formed at both ends of the sixth resistor.

[0011] A second aspect of the present application provides an air conditioning system, comprising a control circuit for an electronic expansion valve as in the above embodiment.

[0012] A third aspect of the present application provides a vehicle, comprising an air-conditioning system as described in the above embodiment.

[0013] The fourth aspect of the present application provides a method for controlling an electronic expansion valve, comprising the following steps: obtaining the temperature and pressure of the refrigerant of a vehicle air-conditioning system when it flows into and out of the electronic expansion valve respectively; generating a control signal for the electronic expansion valve based on the temperature and pressure; inputting the control signal into a signal conditioning circuit, and controlling the electronic expansion valve based on the control signal boosted and amplified by the signal conditioning circuit.

[0014] The fifth aspect of the present application provides a computer-readable storage medium on which a computer program or instruction is stored. The computer program or instruction is executed by a processor to perform a control method for an electronic expansion valve as in the above-mentioned embodiment.

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

[0016] The embodiment of the present application can boost and amplify the control signal through the signal conditioning circuit, so that the controller can control the electronic expansion valve based on the boosted and amplified control signal, thereby being able to effectively regulate the control signal to avoid the circuit from being easily overloaded by reverse flow, 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. Thus, the technical problem of the electronic expansion valve circuit being easily overloaded by reverse flow in the related art is solved.

[0017] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0020] Figure 2 A circuit diagram of an inductor boost circuit provided according to an embodiment of the present application;

[0021] Figure 3 A circuit diagram of a signal amplification circuit provided according to an embodiment of the present application;

[0022] Figure 4 A schematic diagram of a vehicle air conditioning system provided according to an embodiment of the present application;

[0023] Figure 5 A flow chart of a method for controlling an electronic expansion valve according to an embodiment of the present application;

[0024] Figure 6 The present invention is a specific flow chart of a method for controlling an electronic expansion valve according to an embodiment of the present application. DETAILED DESCRIPTION

[0025] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0026] The following describes the control circuit, air conditioning system, vehicle, method and medium of the electronic expansion valve of the embodiment of the present application with reference to the accompanying drawings. In view of the problems mentioned in the above background technology center that the control circuit of the air conditioning system cannot effectively adjust and process the control signal, the circuit is prone to reverse flow overload, the transmission is not stable after the signal is amplified, and the low-frequency signal cannot be effectively removed, the present application provides a control circuit of an electronic expansion valve. In this method, the control signal can be boosted and amplified by a signal adjustment circuit, so that the controller can control the electronic expansion valve based on the boosted and amplified control signal, thereby effectively adjusting and processing the control signal to avoid the circuit from being prone to reverse flow overload. As a result, the problem that the circuit of the electronic expansion valve is prone to reverse flow overload in the related technology is solved.

[0027] Specifically, Figure 1 A schematic diagram of a control circuit of an electronic expansion valve provided in an embodiment of the present application.

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

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

[0030] It can be understood that the embodiment of the present application can boost and amplify the control signal through the signal adjustment circuit 12, so that the controller 13 can control the electronic expansion valve 13 based on the boosted and amplified control signal, thereby being able to effectively adjust and process the control signal to avoid reverse current overload in the circuit.

[0031] It should be noted that the control signal in the embodiment of the present application is an electrical signal, which may be a voltage signal.

[0032] In the embodiment of the present application, 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; and the signal amplification circuit is used to amplify the boosted control signal.

[0034] It can be understood that the signal conditioning circuit 12 of the embodiment of the present application is divided into two parts, one is an inductor boost circuit for boosting the control signal, and the other is a signal amplification circuit for amplifying the boosted control signal. The specific circuit structure is described in the following embodiment.

[0035] In an embodiment of the present application, the inductive 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 a power supply of the vehicle.

[0036] Among them, the output end 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 to the base of the first transistor, the emitter of the first transistor is electrically connected to the power supply, the output end of the transformer is connected in series to the first diode, the first diode is connected in parallel with the first capacitor and the second resistor, the second resistor is connected in parallel with the second diode and the second capacitor, and the transformer is an iron core double-winding transformer with a shielding layer.

[0037] Specifically, the inductor boost circuit is as follows: Figure 2 As shown, the inductive boost circuit includes a switch SA connected in series with a power supply, the output end of the switch SA is connected in parallel with the collector of the first transistor VT1 and the first resistor R1 through a grounded protection 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 end of the transformer T is connected in series with the first diode D1, the first diode D1 is connected in parallel with the first capacitor C1 and the second resistor R2, and the second resistor R2 is connected in parallel with the second diode D2 and the second capacitor C2.

[0038] The working principle of the inductor boost circuit is as follows: the pressure sensor and the temperature sensor give the processor corresponding sensing data, so that the controller controls the inductor boost circuit to increase the voltage, and the sensing data value of the fluid outflow can be fed back, so as to accurately control the required adjustment voltage. The switch SA in the inductor boost circuit performs boosting work through the transformer T. The first transistor VT1 connected in parallel with the transformer T can amplify the weak signal into an electrical signal with a larger amplitude value, so as to ensure the stable transmission of the electrical signal after boosting. The forward voltage signal at the output end of the first resistor R1 is connected to the base of the first transistor VT1, which will transmit this signal to the emitter and the collector, so that the transistor is in a conducting state. The transformer T transmits the electrical signal to the first diode D1, which can play a unidirectional conductive role to prevent the reverse flow of the power supply. The second diode D2 on the second resistor R2 is actually a voltage stabilizing diode, which can play a role in voltage stabilization. Then, the signal coupling effect is performed through the second capacitor C2, which can avoid the front and rear circuits from interfering with each other during static operation.

[0039] In the inductive boost circuit, power amplification is performed on the base of the first transistor VT1 connected through the first resistor R1 to form a primary boosted voltage, and then the boost operation is performed under the action of the transformer T, thereby reaching the voltage value required by the electrical device. Through the secondary boost operation, the stability of voltage transmission is ensured. At the same time, the first capacitor C1 connected in parallel to the first diode D1 can play a filtering effect, filtering out signals that are not required by the band frequency, thereby retaining the frequency signal required for setting.

[0040] In the embodiment of the present application, the signal amplifying circuit includes: third to fifth capacitors, third to seventh resistors and a second transistor.

[0041] Among them, 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, the fourth resistor, the fifth resistor and the base of the second transistor in series, 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, a working voltage terminal is formed between the fourth resistor and the fifth resistor, and voltage output terminals are formed at both ends of the sixth resistor.

[0042] Specifically, the signal amplification circuit is as follows 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 respectively connected in parallel with the third resistor R3, the fourth resistor R4 and the fifth resistor R5 connected in series, and the base of the second diode D2, the fifth resistor R5 is connected in parallel with the fourth capacitor C4 and the sixth resistor R6 connected in series, and the collector of the second triode D2, the emitter output terminal of the second triode D2 is connected in parallel with the seventh resistor R7 and the fifth capacitor C5 for grounding protection, a working voltage terminal is formed between the fourth resistor R4 and the fifth resistor R5, and voltage output terminals are formed at both ends of 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 device for amplification, the fourth resistor R4 is the base bias resistor, which determines whether the second transistor VT2 is in the on state, the fifth resistor R5 is the collector load resistor, the collector is the power supply end of the second transistor VT2, it provides current to supply the second transistor VT2, the emitter is added with the seventh resistor R7 and the fifth capacitor C5, the fifth capacitor C5 is called the AC bypass capacitor, it is short-circuited to the AC, it A current branch can be extended to allow the amplified high-frequency signal to pass through and block the low-frequency DC signal from passing through. The seventh resistor R7 has a DC negative feedback effect. In the signal amplification circuit, the output signal amplified by the second transistor VT2 is fed back to the input end of the signal through the AC bypass capacitor to achieve DC negative feedback of the signal. The actual input voltage of the base on 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 circuit working stability is improved.

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

[0045] In summary, in addition to boosting the control signal, the inductive boost circuit can also play a role in stabilizing the voltage, and can also filter out signals that are not required by the band frequency, thereby retaining the set frequency signal; the signal amplification circuit can not only amplify the control signal, but also stabilize the control signal. Therefore, the control circuit of the electronic expansion valve of the present application can effectively regulate the control signal, and can avoid reverse current overload in the circuit, so that the transmission of the signal after amplification is more stable and the low-frequency signal can be effectively removed.

[0046] According to the control circuit of the electronic expansion valve proposed in the embodiment of the present application, the control signal can be boosted and amplified by the signal adjustment circuit, so that the controller can control the electronic expansion valve based on the boosted and amplified control signal, thereby being able to effectively adjust the control signal to avoid reverse current overload in the circuit. 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] An embodiment of the present application also provides an air conditioning system, comprising a control circuit of the electronic expansion valve as described above.

[0048] An embodiment of the present application also provides a vehicle, comprising the above air-conditioning system.

[0049] Specifically, the power source of the air-conditioning system of the vehicle in the embodiment of the present application can be electricity. The refrigerant circulates through four stages of compression, heat release, throttling and heat absorption with the help of an electric compressor, condenser, expansion valve and evaporator, and dissipates the heat inside the vehicle to the outside of the vehicle, thereby achieving the purpose of lowering the temperature inside the vehicle. When the temperature inside the vehicle needs to be increased, the blower transports the heat released by the condenser into the vehicle, and the low-temperature and low-pressure gaseous refrigerant is liquefied into a low-temperature and low-pressure liquid refrigerant through an external heat exchanger, absorbing heat from the external environment, thereby forming a refrigeration 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 out-vehicle heat exchanger 3.

[0051] The electric compressor 1 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant. Subsequently, the high-temperature and high-pressure gaseous refrigerant passes through the in-vehicle heat exchanger 2 to condense and release heat to become a low-temperature and high-pressure liquid refrigerant, and the low-temperature and high-pressure liquid refrigerant is transported to the electronic expansion valve 11.

[0052] The electronic expansion valve 11 is used to reduce the pressure of low-temperature and high-pressure liquid refrigerant into low-temperature and low-pressure gaseous refrigerant through gasification and transport it to the outdoor heat exchanger 3. The low-temperature and low-pressure gaseous refrigerant evaporates and absorbs heat to become low-temperature and low-pressure gaseous refrigerant, and the low-temperature and low-pressure gaseous refrigerant is transported back to the electric compressor 1. The heat dissipated by the high-temperature and high-pressure gaseous refrigerant after condensation in the indoor heat exchanger 2 is transported to the interior of the vehicle through the blower, thereby constituting a heating process. The low-temperature and low-pressure gaseous refrigerant evaporates and absorbs heat through the outdoor heat exchanger 3 to cool the interior of the vehicle, thereby constituting a cooling process.

[0053] In addition, the present application can use a hybrid oil vehicle to perform cooling or heating work. When the power source is the engine compartment, the engine compartment is used to release high-temperature, low-pressure gaseous refrigerant and transport it to the compressor; the compressor compresses the high-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant, and transports the high-temperature, high-pressure gaseous refrigerant 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 transports it to the liquid storage dryer; the liquid storage dryer is used to absorb moisture and purify the low-temperature, high-pressure liquid refrigerant and transport it to the expansion valve; the expansion valve reduces the pressure of the low-temperature, high-pressure liquid refrigerant into a low-temperature, low-pressure gas refrigerant through gasification and transports it to the evaporator; the evaporator is used to convert the low-temperature, high-pressure liquid refrigerant into a low-temperature, low-pressure liquid refrigerant by absorbing heat, and transports the low-temperature, low-pressure liquid refrigerant to the engine compartment, absorbs heat in the engine compartment, and converts the low-temperature, low-pressure liquid refrigerant into a high-temperature, high-pressure gaseous refrigerant. The system constitutes a cycle.

[0054] As for the electric vehicle, the battery is used to power the electric compressor 1, and the electric compressor 1 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant. Subsequently, the high-temperature and high-pressure gaseous refrigerant flows into the condenser through the four-way reversing valve; the heat emitted by the high-temperature and high-pressure gaseous refrigerant after condensation in the condenser is transported to the vehicle through the blower, thus constituting a heating process; the high-temperature and high-pressure gaseous refrigerant is condensed into a low-temperature and high-pressure liquid refrigerant through the evaporator, and becomes a low-temperature and low-pressure gas-liquid mixture refrigerant after throttling and reducing the pressure through the expansion valve. The low-temperature and low-pressure gas-liquid mixture refrigerant evaporates and absorbs heat through the evaporator to become a low-temperature and low-pressure gaseous refrigerant; the low-temperature and low-pressure gas-liquid mixture refrigerant evaporates and absorbs heat through the evaporator, thereby cooling the interior of the vehicle, constituting a cooling process, and the gaseous refrigerant is purified and dried through the liquid storage drying tank, and the gaseous refrigerant is re-transported to the electric compressor 1, constituting a cycle.

[0055] Next, a control method for an electronic expansion valve according to an embodiment of the present application will be described with reference to the accompanying drawings.

[0056] Figure 5 It is a flow chart of the control method of the electronic expansion valve of the embodiment of the present application.

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

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

[0059] Among them, the temperature and pressure can be measured by a temperature sensor and a pressure sensor respectively.

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

[0061] It can be understood that the embodiment of the present application can generate a control signal for the electronic expansion valve based on temperature and pressure, and the control signal includes a signal for driving the valve needle in the electronic expansion valve to adjust the flow rate of liquid refrigerant, refrigeration, etc.

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

[0063] It can be understood that the embodiment of the present application can input the control signal into the signal conditioning circuit, and control the electronic expansion valve 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 above explanation of the embodiment of the control circuit of the electronic expansion valve is also applicable to the control method of the electronic expansion valve of this embodiment, which will not be repeated here.

[0065] The following describes the control method of the electronic expansion valve of the present application through a specific embodiment. Figure 6 As shown, the following steps are included:

[0066] S1.1: collecting the temperature and pressure of the refrigerant flowing into / out of the electronic expansion valve through a temperature sensor and a pressure sensor, and transmitting the temperature and pressure to a processor (equivalent to the controller of the present application);

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

[0068] S1.3: The signal amplifying circuit amplifies the electrical signal and controls the transmission of the amplified electrical signal to the electronic expansion valve;

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

[0070] According to the control method of the electronic expansion valve proposed in the embodiment of the present application, a control signal can be generated based on the temperature and pressure of the refrigerant of the vehicle air-conditioning system when it flows into and out of the electronic expansion valve, respectively, and then the control signal is transmitted to the signal conditioning circuit, and the electronic expansion valve is controlled based on the control signal 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] The embodiment of the present application further provides a computer-readable storage medium on which a computer program or instruction is stored. When the computer program or instruction is executed by a processor, the control method of the electronic expansion valve as described above is implemented.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0073] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0074] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0075] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one or a combination of multiple of the following technologies known in the art: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0076] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

Claims

1. A control circuit for an electronic expansion valve, characterized in that: The following steps are involved: Electronic expansion valve; A signal conditioning circuit, used for boosting and amplifying the control signal; The controller generates a control signal according to the temperature and pressure of the refrigerant of the vehicle air conditioning system when it flows into and out of the electronic expansion valve, inputs the control signal into the signal conditioning circuit, and controls the electronic expansion valve based on the control signal 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 signal conditioning circuit comprises: an inductor boost circuit and a signal amplification circuit, wherein: The inductor boost circuit is used to boost the control signal; The signal amplifying circuit is used to amplify the boosted control signal.

3. The control circuit of the electronic expansion valve according to claim 2, characterized in that: 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 a power source of the vehicle, wherein: The output end 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 to the base of the first transistor, the emitter of the first transistor is electrically connected to a power supply, the output end of the transformer is connected in series to the first diode, the first diode is connected in parallel with the first capacitor and the second resistor, and the second resistor is connected in parallel with the second diode and the second capacitor.

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

5. The control circuit of the electronic expansion valve according to claim 2, characterized in that: The signal amplification circuit includes: third to fifth capacitors, third to seventh resistors and a second triode, wherein: One end of the third capacitor is connected to the power input end of the vehicle, the other end of the third capacitor is connected in parallel with the third resistor, and 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 end of the second transistor is connected in parallel with the seventh resistor and the fifth capacitor, and the seventh resistor is grounded.

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

7. An air conditioning system, characterized in that: A control circuit comprising an electronic expansion valve as claimed in any one of claims 1 to 6.

8. A vehicle, characterized in that: Comprising the air conditioning system as claimed in claim 7.

9. A control method for an electronic expansion valve, characterized in that: The following steps are involved: Obtain the temperature and pressure of the refrigerant of the vehicle air conditioning system when it flows into and out of the electronic expansion valve; generating a control signal for the electronic expansion valve based on the temperature and the pressure; The control signal is input to a signal conditioning circuit, and the electronic expansion valve is controlled based on the control signal boosted and amplified by the signal conditioning circuit.

10. A computer-readable storage medium having a computer program or instruction stored thereon, characterized in that: The computer program or instruction is executed by a processor to implement the control method of the electronic expansion valve as claimed in claim 9.

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