An opening degree control method of an electronic expansion valve

Abstract

The present application relates to air conditioning technical field, especially electronic expansion valve's opening degree control method. The method is applied to air conditioner, the air conditioner includes controller, compressor, indoor unit and outdoor unit;According to the operating frequency of compressor and the ambient temperature of indoor and outdoor unit, the target exhaust temperature of the compressor is determined, and the actual exhaust temperature is compared with the target exhaust temperature, when the actual exhaust temperature fluctuates around the target exhaust temperature, the control logic can be converted to adjust the opening degree of electronic expansion valve by dichotomy, so that the optimal opening degree value corresponding to the closest target exhaust temperature in the fluctuation interval is found out faster in the unit operation, the number of valve step operation is reduced, so as to reduce the probability of electronic expansion valve out of step, so that the unit operation is more stable, more energy saving and comfortable.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a method for controlling the opening degree of an electronic expansion valve. Background Technology

[0002] Currently, the conventional method of controlling the exhaust gas flow by adjusting the valve opening based on the target exhaust gas value is relatively common in air conditioning systems. However, as the actual exhaust gas value deviates from the target value and fluctuates, constantly adjusting the valve opening is necessary to bring the actual exhaust gas value closer to the target value, which is inefficient. Furthermore, excessive valve adjustments in traditional control methods increase the risk of valve malfunction. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide an opening control method for an electronic expansion valve. When the exhaust gas of the unit is unstable and fluctuates, this control method can more quickly find the optimal opening value during unit operation within the fluctuation range of the valve step, reducing the number of times the unit adjusts the expansion valve, making the unit operation more stable, energy-efficient, and comfortable.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A method for controlling the opening degree of an electronic expansion valve, applied to an air conditioner, characterized in that: the air conditioner includes a controller, a compressor, an indoor unit, and an outdoor unit; the method includes:

[0006] Step 1: After the air conditioner is turned on, the controller obtains the actual discharge temperature of the compressor; based on the compressor's operating frequency and the ambient temperature of the indoor and outdoor units, the target discharge temperature of the compressor is determined.

[0007] Step 2: ① If the actual exhaust temperature is less than the target exhaust temperature, the controller records the current opening of the electronic expansion valve as a, and reduces the opening of the electronic expansion valve to make it operate at an.

[0008] ②If the actual exhaust temperature is greater than the target exhaust temperature, the controller records the current valve opening as b and increases the opening of the electronic expansion valve to operate at b+n.

[0009] Step 3: ① After the air conditioner runs under an for a period of time, the controller continues to acquire the actual exhaust temperature and determines whether |actual exhaust temperature - target exhaust temperature| is less than ε; if it is not less than ε, the controller continues to determine whether the actual exhaust temperature is greater than the target exhaust temperature; if it is less, the current electronic expansion valve opening value is set to a; if it is greater, the current electronic expansion valve opening value an is set to b.

[0010] ② After the air conditioner runs at b+n for a period of time, the controller continues to acquire the actual exhaust temperature and determines whether |actual exhaust temperature - target exhaust temperature| is less than ε; if it is not less than ε, the controller continues to determine whether the actual exhaust temperature is less than the target exhaust temperature. If it is greater, the current electronic expansion valve opening value is named b; if it is less, the current electronic expansion valve opening b+n is named a.

[0011] Step 4: When a naming conversion between a and b occurs in any single step ① or ② of Step 3, take a and b in that step as the interval, obtain the midpoint X of the interval (a,b) as the current opening degree of the electronic expansion valve, and make the air conditioner run at the opening degree X of the electronic expansion valve.

[0012] Step 5: After the air conditioner has been running for a period of time with the electronic expansion valve opening X, obtain the actual exhaust temperature and determine whether |actual exhaust temperature - target exhaust temperature| is less than ε;

[0013] Step 6: When |actual exhaust temperature - target exhaust temperature| is not less than ε; if the actual exhaust temperature is less than the target exhaust temperature, let a = x; if the actual exhaust temperature is greater than the target exhaust temperature, let b = x; repeat steps 4 to 6 above until |actual exhaust temperature - target exhaust temperature| is less than ε.

[0014] Preferably, in step three, if the air conditioner operates for a period of time at the electronic expansion valve opening degree an or b+n, and the |actual exhaust temperature - target exhaust temperature| is less than ε, then the determination ends, and the air conditioner operates according to the current an or b+n valve opening degree.

[0015] Preferably, in step three, if the actual exhaust temperature in ① is less than the target exhaust temperature, or if the actual exhaust temperature in ② is greater than the target exhaust temperature, then return to step two.

[0016] Preferably, in step five, if after the air conditioner has been running for a period of time at the electronic expansion valve opening degree x, the |actual exhaust temperature - target exhaust temperature| is less than ε, then the determination ends and the air conditioner runs at the current x valve opening degree.

[0017] Preferably, ε is a precision given by the individual.

[0018] An air conditioner that uses the opening control method for an electronic expansion valve as described in any one of the above methods.

[0019] The present invention adopts the above-mentioned technical solution, which determines the target exhaust temperature of the compressor based on the operating frequency of the compressor and the ambient temperature of the indoor and outdoor units. Then, the measured actual exhaust temperature is compared with the target exhaust temperature, and the opening of the electronic expansion valve is adjusted by the binary method. The optimal opening value during unit operation is found more quickly in the fluctuation range, reducing the number of valve step operations, thereby reducing the probability of electronic expansion valve step failure, making the unit operation more stable, more energy-efficient and comfortable. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the logic control method for controlling the opening of an electronic expansion valve. Implementation

[0021] Embodiments of the present invention are described in detail below, examples of which are illustrated 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 the present invention, and should not be construed as limiting the present invention.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, unless explicitly defined otherwise.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. Example

[0026] like Figure 1 The method for controlling the opening degree of an electronic expansion valve is shown and applied to an air conditioner, which includes a controller, a compressor, an indoor unit, and an outdoor unit; the method includes:

[0027] Step 1: After the air conditioner is turned on, the controller obtains the actual discharge temperature of the compressor; based on the compressor's operating frequency and the ambient temperature of the indoor and outdoor units, the target discharge temperature of the compressor is determined.

[0028] Step 2: ① If the actual exhaust temperature is less than the target exhaust temperature, the controller records the current opening of the electronic expansion valve as 'a' and reduces the opening of the electronic expansion valve to make it operate at 'an'.

[0029] ②If the actual exhaust temperature is greater than the target exhaust temperature, the controller records the current valve opening as b and increases the opening of the electronic expansion valve to operate at b+n.

[0030] Step 3: ① After the air conditioner runs under an for a period of time, the controller continues to acquire the actual exhaust temperature and determines whether |actual exhaust temperature - target exhaust temperature| is less than ε; if it is not less than ε, the controller continues to determine whether the actual exhaust temperature is greater than the target exhaust temperature; if it is less, the current electronic expansion valve opening value is set to a; if it is greater, the current electronic expansion valve opening value an is set to b.

[0031] ② After the air conditioner runs at b+n for a period of time, the controller continues to acquire the actual exhaust temperature and determines whether |actual exhaust temperature - target exhaust temperature| is less than ε; if it is not less than ε, the controller continues to determine whether the actual exhaust temperature is less than the target exhaust temperature. If it is greater, the current electronic expansion valve opening value is named b; if it is less, the current electronic expansion valve opening b+n is named a.

[0032] Step 4: When a naming conversion between a and b occurs in any single step ① or ② of Step 3, take a and b in that step as the interval, obtain the midpoint X of the interval (a,b) as the current opening degree of the electronic expansion valve, and make the air conditioner run at the opening degree X of the electronic expansion valve.

[0033] Step 5: After the air conditioner has been running for a period of time with the electronic expansion valve opening X, obtain the actual exhaust temperature and determine whether |actual exhaust temperature - target exhaust temperature| is less than ε;

[0034] Step 6: When |actual exhaust temperature - target exhaust temperature| is not less than ε; if the actual exhaust temperature is less than the target exhaust temperature, let a = x; if the actual exhaust temperature is greater than the target exhaust temperature, let b = x; repeat steps 4 to 6 above until |actual exhaust temperature - target exhaust temperature| is less than ε.

[0035] Furthermore, in step three, if after the air conditioner has been running for a period of time at the electronic expansion valve opening degree an or b+n, the |actual exhaust temperature - target exhaust temperature| is less than ε, then the determination ends and the air conditioner runs according to the current an or b+n valve opening degree.

[0036] Furthermore, in step three, if the actual exhaust temperature in ① is less than the target exhaust temperature, or if the actual exhaust temperature in ② is greater than the target exhaust temperature, then return to step two.

[0037] Furthermore, in step five, if after the air conditioner has been running for a period of time at the electronic expansion valve opening degree x, the |actual exhaust temperature - target exhaust temperature| is less than ε, then the determination ends and the air conditioner continues to run at the current x valve opening degree.

[0038] Furthermore, ε is a precision given by the individual.

[0039] The present invention adopts the above-mentioned technical solution, which determines the target exhaust temperature of the compressor based on the operating frequency of the compressor and the ambient temperature of the indoor and outdoor units. Then, the measured actual exhaust temperature is compared with the target exhaust temperature, and the opening of the electronic expansion valve is adjusted by the binary method. The optimal opening value during unit operation is found more quickly in the fluctuation range, reducing the number of valve step operations, thereby reducing the probability of electronic expansion valve step failure, making the unit operation more stable, more energy-efficient and comfortable.

[0040] Example 2: An air conditioner, applied to the opening control method of an electronic expansion valve in Example 1.

[0041] In the description of this specification, 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 the invention. 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.

[0042] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A method for controlling the opening degree of an electronic expansion valve, applied to an air conditioner, characterized in that: The air conditioner includes a controller, a compressor, an indoor unit, and an outdoor unit; the method includes: Step 1: After the air conditioner is turned on, the controller obtains the actual discharge temperature of the compressor; based on the compressor's operating frequency and the ambient temperature of the indoor and outdoor units, the target discharge temperature of the compressor is determined. Step 2: ① If the actual exhaust temperature is less than the target exhaust temperature, the controller records the current opening of the electronic expansion valve as 'a' and reduces the opening of the electronic expansion valve to make it operate at 'an'. ②If the actual exhaust temperature is greater than the target exhaust temperature, the controller records the current valve opening as b and increases the opening of the electronic expansion valve to operate at b+n. Step 3: ① After the air conditioner runs under an for a period of time, the controller continues to acquire the actual exhaust temperature and determines whether |actual exhaust temperature - target exhaust temperature| is less than ε; if it is not less than ε, the controller continues to determine whether the actual exhaust temperature is greater than the target exhaust temperature. If it is less, the current electronic expansion valve opening value is named as a; if it is greater, the current electronic expansion valve opening value an is named as b; ε is a precision given by the user. ② After the air conditioner runs at b+n for a period of time, the controller continues to acquire the actual exhaust temperature and determines whether |actual exhaust temperature - target exhaust temperature| is less than ε; if it is not less than ε, the controller continues to determine whether the actual exhaust temperature is less than the target exhaust temperature. If it is greater, the current electronic expansion valve opening value is named b; if it is less, the current electronic expansion valve opening b+n is named a. If the actual exhaust temperature in step ① is less than the target exhaust temperature, or if the actual exhaust temperature in step ② is greater than the target exhaust temperature, then return to step two. Step 4: When a naming conversion between a and b occurs in any single step ① or ② of Step 3, take a and b in that step as the interval, obtain the midpoint X of the interval (a,b) as the current opening degree of the electronic expansion valve, and make the air conditioner run at the opening degree X of the electronic expansion valve. Step 5: After the air conditioner has been running for a period of time with the electronic expansion valve opening X, obtain the actual exhaust temperature and determine whether |actual exhaust temperature - target exhaust temperature| is less than ε; Step 6: When |actual exhaust temperature - target exhaust temperature| is not less than ε; if the actual exhaust temperature is less than the target exhaust temperature, let a = x; if the actual exhaust temperature is greater than the target exhaust temperature, let b = x; repeat steps 4 to 6 above until |actual exhaust temperature - target exhaust temperature| is less than ε.

2. The opening degree control method of an electronic expansion valve according to claim 1, characterized in that: In step three, if the air conditioner operates for a period of time at the electronic expansion valve opening degree an or b+n, and the actual exhaust temperature - target exhaust temperature| is less than ε, then the judgment ends and the air conditioner operates according to the current an or b+n valve opening degree.

3. The opening control method for an electronic expansion valve according to claim 1, characterized in that: In step five, if after the air conditioner has been running for a period of time at the electronic expansion valve opening degree x, the |actual exhaust temperature - target exhaust temperature| is less than ε, then the determination ends and the air conditioner continues to run at the current x valve opening degree.

4. An air conditioner, characterized in that: The opening control method is applied to an electronic expansion valve as described in any one of claims 1 to 3.

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