An air conditioner

Abstract

The application provides an air conditioner, relates to the technical field of intelligent household appliances, and realizes intelligent adjustment of the opening degree of an electronic expansion valve under different conditions, so that the air conditioner is always kept in a stable operation state. The air conditioner comprises a compressor, a condenser, an evaporator, an electronic expansion valve and a controller. The electronic expansion valve is connected between the condenser and the evaporator. The controller is connected with the electronic expansion valve, and the controller is configured to: under the condition that the outdoor ring temperature is greater than a first preset temperature and the compressor is operated for a preset time length, if the exhaust temperature of the compressor at a previous moment is greater than or equal to the exhaust temperature of the compressor at a current moment, then the opening degree increasing / decreasing step number of the electronic expansion valve is controlled to be between 0 and a first increasing / decreasing step number, and otherwise, the opening degree increasing / decreasing step number of the electronic expansion valve is controlled to be between 0 and a second increasing / decreasing step number. The first increasing / decreasing step number is EVO(n-1) / a, and the second increasing / decreasing step number is EVO(n-1) / c, wherein EVO(n-1) is the opening degree of the electronic expansion valve at the previous moment, and a and c are constants.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent household appliances, and in particular to an air conditioner. BACKGROUND

[0002] Electronic expansion valve is widely used in air conditioners as a throttling element that can regulate the refrigerant flow into the refrigeration device according to a preset program. The adjustment of the opening size of the electronic expansion valve controls the throttling size, thereby affecting the running state of the air conditioning system.

[0003] The existing air conditioner often uses a single limit value to control the adjustment of the opening size of the electronic expansion valve, and the excessively rough control often causes over-regulation and under-regulation of the electronic expansion valve, so that the air conditioner is not in the optimal running state and has large power consumption. SUMMARY

[0004] The embodiment of the present application provides an air conditioner which can intelligently adjust the opening of the electronic expansion valve under different conditions, so that the air conditioner always remains in a stable running state.

[0005] To achieve the above-mentioned purpose, the embodiment of the present application adopts the following technical scheme:

[0006] The air conditioner provided by the present application comprises a compressor, a condenser, an evaporator, an electronic expansion valve and a controller. The compressor and the condenser are connected, and the compressor is configured to discharge air to the condenser. The condenser and the evaporator are connected, and the condenser is configured to provide condensed liquid to the evaporator. The evaporator is connected with the compressor, and the evaporator is configured to discharge air to the compressor. The electronic expansion valve is connected between the condenser and the evaporator. The controller is connected with the electronic expansion valve, and the controller is configured to: in the case that the outdoor ambient temperature is greater than a first preset temperature and the compressor runs for a preset time length, if the discharge temperature of the compressor at the previous moment is greater than or equal to the discharge temperature of the compressor at the current moment, then the opening adjustment step number of the electronic expansion valve is between 0 and a first adjustment step number, and the first adjustment step number is EVO(n-1) / a, wherein a is a constant and EVO(n-1) is the opening of the electronic expansion valve at the previous moment. In the case that the outdoor ambient temperature is less than or equal to the first preset temperature and the compressor runs for a preset time length, if the discharge temperature of the compressor at the previous moment is less than or equal to the discharge temperature of the compressor at the current moment, then the opening adjustment step number of the electronic expansion valve is between 0 and a second adjustment step number, and the second adjustment step number is EVO(n-1) / c, wherein c is a constant.

[0007] After the compressor has been running for a period of time, the controller compares the compressor's discharge temperature at fixed intervals to determine how the electronic expansion valve opening should be adjusted, limiting the upper and lower limits of the number of steps the electronic expansion valve can take to increase or decrease its opening. If the compressor's discharge temperature at the previous moment is greater than or equal to the current moment's discharge temperature, the controller controls the electronic expansion valve opening to increase or decrease between 0 and the first increase / decrease step. If the compressor's discharge temperature at the previous moment is less than or equal to the current moment's discharge temperature, the controller controls the electronic expansion valve opening to increase or decrease between 0 and the second increase / decrease step. This ensures that the air conditioner is always in a stable and optimal state during operation, resulting in higher cooling and heating efficiency while reducing energy consumption.

[0008] As one possible implementation, when the outdoor ambient temperature is higher than a first preset temperature and the compressor has been running for a preset duration, the controller is further configured to: when the air conditioner is running in the first mode and the opening degree of the electronic expansion valve is greater than a first threshold at the previous moment, control the upper limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve to be EVO(n-1) / b. 21 , where b 21 This is a constant. When the air conditioner is running in the first mode, and the opening degree of the electronic expansion valve at the previous moment is greater than the second threshold and less than or equal to the first threshold, the upper limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is EVO(n-1) / b. 22 , where b 22 This is a constant. When the air conditioner is running in the first mode, and the opening degree of the electronic expansion valve at the previous moment is less than or equal to the second threshold, the upper limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is EVO(n-1) / b. 23 , where b 23 This is a constant. When the air conditioner is running in the second mode, and the opening degree of the electronic expansion valve is greater than the second threshold at the previous moment, the upper limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is EVO(n-1) / b. 24 , where b 24 This is a constant. When the air conditioner is running in the second mode, and the opening degree of the electronic expansion valve at the previous moment is less than or equal to the second threshold, the upper limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is EVO(n-1) / b. 25 , where b 25 It is a constant.

[0009] As one possible implementation, the controller is also configured to: when the air conditioner is operating in a first mode and the opening degree of the electronic expansion valve is greater than a first threshold at the previous moment, if the first condition is met, then the lower limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is b. 16 , where b 16 It is a constant. If the second condition is met, the lower limit of the number of steps for increasing or decreasing the opening of the electronic expansion valve is -EVO(n-1) / b.11 where b 11 is a constant. If the third condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is -EVO(n-1) / b6, where b6 is a constant. If the fourth condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is -EVO(n-1) / b1, where b1 is a constant. When the air conditioner is operated in the first mode, and the opening degree of the electronic expansion valve at the previous time is greater than the second threshold value and less than or equal to the first threshold value, if the first condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is b 17 where b 17 is a constant. If the second condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is -EVO(n-1) / b 12 where b 12 is a constant. If the third condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is -EVO(n-1) / b7, where b7 is a constant. If the fourth condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is -EVO(n-1) / b2, where b2 is a constant. When the air conditioner is operated in the first mode, and the opening degree of the electronic expansion valve at the previous time is less than or equal to the second threshold value, if the first condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is b 18 where b 18 is a constant. If the second condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is -EVO(n-1) / b 13 where b 13 is a constant. If the third condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is -EVO(n-1) / b8, where b8 is a constant. If the fourth condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is -EVO(n-1) / b3, where b3 is a constant. The first condition includes that the difference between the current temperature and the saturation temperature corresponding to the discharge pressure of the compressor is greater than or equal to k, and the low-pressure pressure value of the compressor is less than or equal to the low-pressure protection control value or the pressure ratio is greater than or equal to n, where k and n are constants. The second condition includes that the difference between the current temperature and the saturation temperature corresponding to the discharge pressure of the compressor is greater than or equal to h, and the low-pressure pressure value of the compressor is less than or equal to the sum of the low-pressure protection control value and i or the pressure ratio is greater than or equal to j, where h, i, and j are constants. The third condition includes that the difference between the current temperature and the saturation temperature corresponding to the discharge pressure of the compressor is greater than or equal to e, and the low-pressure pressure value of the compressor is less than or equal to the sum of the low-pressure protection control value and f or the pressure ratio is greater than or equal to g, where e, f, and g are constants. The fourth condition includes the remaining cases other than the first condition, the second condition, and the third condition.

[0010] As a possible implementation, the controller is further configured to: in a case that the opening degree of the electronic expansion valve at the previous time is greater than the second threshold value, if the first condition is met, control the opening degree increment / decrement step number lower limit of the electronic expansion valve to be b 19 , where b 19 is a constant. If the second condition is met, control the opening degree increment / decrement step number lower limit of the electronic expansion valve to be -b 14 , where b 14 is a constant. If the third condition is met, control the opening degree increment / decrement step number lower limit of the electronic expansion valve to be -EVO(n-1) / b9, where b9 is a constant. If the fourth condition is met, control the opening degree increment / decrement step number lower limit of the electronic expansion valve to be -EVO(n-1) / b4, where b4 is a constant. When the air conditioner is running in the second mode, and in a case that the opening degree of the electronic expansion valve at the previous time is less than or equal to the second threshold value, if the first condition is met, control the opening degree increment / decrement step number lower limit of the electronic expansion valve to be b 20 , where b 20 is a constant. If the second condition is met, control the opening degree increment / decrement step number lower limit of the electronic expansion valve to be -b 15 , where b 15 is a constant. If the third condition is met, control the opening degree increment / decrement step number lower limit of the electronic expansion valve to be -b 10 , where b 10 is a constant. If the fourth condition is met, control the opening degree increment / decrement step number lower limit of the electronic expansion valve to be -b5, where b5 is a constant.

[0011] As a possible implementation, in a case that the outdoor ring temperature is less than or equal to a first preset temperature, and the compressor runs for a preset time length, the controller is further configured to: when the air conditioner is running in the first mode, and the opening degree of the electronic expansion valve at the previous time is greater than a third threshold value, control the opening degree increment / decrement step number upper limit of the electronic expansion valve to be EVO(n-1) / d 21 , where d 21 is a constant. When the air conditioner is running in the first mode, and the opening degree of the electronic expansion valve at the previous time is greater than a fourth threshold value and less than or equal to the third threshold value, control the opening degree increment / decrement step number upper limit of the electronic expansion valve to be EVO(n-1) / d 22 , where d 22 is a constant. When the air conditioner is running in the first mode, and the opening degree of the electronic expansion valve at the previous time is less than or equal to the fourth threshold value, control the opening degree upper limit of the electronic expansion valve to be EVO(n-1) / d 23 , where d 23 is a constant. When the air conditioner is running in the second mode, and the opening degree of the electronic expansion valve at the previous time is greater than the fourth threshold value, control the opening degree increment / decrement step number upper limit of the electronic expansion valve to be EVO(n-1) / d 24 , where d 24is a constant. When the air conditioner is running in the second mode, and the opening degree of the electronic expansion valve at the previous moment is less than or equal to the fourth threshold value, the upper limit of the opening degree of the electronic expansion valve is controlled to be EVO(n-1) / d 25 , where d 25 is a constant.

[0012] As a possible implementation, the controller is further configured to: when the air conditioner is running in the first mode, and the opening degree of the electronic expansion valve at the previous moment is greater than the third threshold value, if the first condition is satisfied, the lower limit of the opening degree of the electronic expansion valve is controlled to be d 16 , where d 16 is a constant. If the second condition is satisfied, the lower limit of the opening degree of the electronic expansion valve is controlled to be -EVO(n-1) / d 11 , where d 11 is a constant. If the third condition is satisfied, the lower limit of the opening degree of the electronic expansion valve is controlled to be -EVO(n-1) / d6, where d6 is a constant. If the fourth condition is satisfied, the lower limit of the opening degree of the electronic expansion valve is controlled to be -EVO(n-1) / d1, where d1 is a constant. When the air conditioner is running in the first mode, and the opening degree of the electronic expansion valve at the previous moment is greater than the fourth threshold value, and less than or equal to the third threshold value, if the first condition is satisfied, the lower limit of the opening degree of the electronic expansion valve is controlled to be d 17 , where d 17 is a constant. If the second condition is satisfied, the lower limit of the opening degree of the electronic expansion valve is controlled to be -EVO(n-1) / d 12 , where d 12 is a constant. If the third condition is satisfied, the lower limit of the opening degree of the electronic expansion valve is controlled to be -EVO(n-1) / d7, where d7 is a constant. If the fourth condition is satisfied, the lower limit of the opening degree of the electronic expansion valve is controlled to be -EVO(n-1) / d2, where d2 is a constant. When the air conditioner is running in the first mode, and the opening degree of the electronic expansion valve at the previous moment is less than or equal to the fourth threshold value, if the first condition is satisfied, the lower limit of the opening degree of the electronic expansion valve is controlled to be d 18 , where d 18 is a constant. If the second condition is satisfied, the lower limit of the opening degree of the electronic expansion valve is controlled to be -d 13 , where d 13is a constant. If the third condition is met, the lower limit of the opening degree step-up or step-down number of the electronic expansion valve is -d8, where d8 is a constant. If the fourth condition is met, the lower limit of the opening degree step-up or step-down number of the electronic expansion valve is -d3, where d3 is a constant. The first condition includes that the difference between the current temperature and the saturation temperature corresponding to the compressor discharge pressure is greater than or equal to k, and the low-pressure value of the compressor is less than or equal to the low-pressure protection control value or the pressure ratio is greater than or equal to n, where k and n are constants. The second condition includes that the difference between the current temperature and the saturation temperature corresponding to the compressor discharge pressure is greater than or equal to h, and the low-pressure value of the compressor is less than or equal to the sum of the low-pressure protection control value and i or the pressure ratio is greater than or equal to j, where h, i, and j are constants. The third condition includes that the difference between the current temperature and the saturation temperature corresponding to the compressor discharge pressure is greater than or equal to e, and the low-pressure value of the compressor is less than or equal to the sum of the low-pressure protection control value and f or the pressure ratio is greater than or equal to g, where e, f, and g are constants. The fourth condition includes the remaining cases other than the first condition, the second condition, and the third condition.

[0013] As one possible implementation, the controller is further configured to, when the air conditioner is operating in the second mode and the opening degree of the electronic expansion valve at the previous time is greater than the fourth threshold value, if the first condition is met, control the lower limit of the opening degree step-up or step-down number of the electronic expansion valve to be d 19 , where d 19 is a constant. If the second condition is met, the lower limit of the opening degree step-up or step-down number of the electronic expansion valve is -d 14 , where d 14 is a constant. If the third condition is met, the lower limit of the opening degree step-up or step-down number of the electronic expansion valve is -EVO(n-1) / d9, where d9 is a constant. If the fourth condition is met, the lower limit of the opening degree step-up or step-down number of the electronic expansion valve is -EVO(n-1) / d4, where d4 is a constant. When the air conditioner is operating in the second mode and the opening degree of the electronic expansion valve at the previous time is less than or equal to the fourth threshold value, if the first condition is met, the lower limit of the opening degree step-up or step-down number of the electronic expansion valve is d 20 , where d 20 is a constant. If the second condition is met, the lower limit of the opening degree step-up or step-down number of the electronic expansion valve is -d 15 , where d 15 is a constant. If the third condition is met, the lower limit of the opening degree step-up or step-down number of the electronic expansion valve is -b 10 , where d 10 is a constant. If the fourth condition is met, the lower limit of the opening degree step-up or step-down number of the electronic expansion valve is -b5, where d5 is a constant.

[0014] As a possible implementation manner, the lower limit values of the opening degree of the electronic expansion valve corresponding to different conditions have a priority order, and the priority of the first condition, the second condition, the third condition and the fourth condition decreases in turn.

[0015] As a possible implementation manner, a temperature sensor is arranged on the compressor, and the temperature sensor is configured to measure the exhaust temperature of the compressor.

[0016] As a possible implementation manner, a pressure sensor is arranged on the compressor, and the pressure sensor is configured to measure the low-pressure value of the compressor. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the technical scheme of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical scheme of the present application, and do not constitute a limitation on the technical scheme of the present application.

[0018] Figure 1 An internal structure schematic diagram of an electronic expansion valve provided by an embodiment of the present application;

[0019] Figure 2 A schematic diagram of an electronic expansion valve connected with a controller provided by an embodiment of the present application;

[0020] Figure 3 A schematic diagram of an air conditioner provided by an embodiment of the present application;

[0021] Figure 4 A schematic diagram of air conditioner refrigeration provided by an embodiment of the present application;

[0022] Figure 5 Another schematic diagram of an air conditioner provided by an embodiment of the present application;

[0023] Figure 6 A schematic diagram of a controller configuration provided by an embodiment of the present application;

[0024] Figure 7 Another schematic diagram of a controller configuration provided by an embodiment of the present application;

[0025] Figure 8 A schematic diagram of a relationship between a second threshold value and a first threshold value provided by an embodiment of the present application;

[0026] Figure 9 A schematic diagram of a relationship between the opening degree of an electronic expansion valve and a threshold value provided by an embodiment of the present application;

[0027] Figure 10 Another schematic diagram of a relationship between the opening degree of an electronic expansion valve and a threshold value provided by an embodiment of the present application;

[0028] Figure 11Another controller configuration schematic provided for the embodiment of the present application;

[0029] Figure 12 Another controller configuration schematic provided for the embodiment of the present application;

[0030] Figure 13 A third threshold and fourth threshold relationship schematic provided for the embodiment of the present application;

[0031] Figure 14 Another electronic expansion valve opening and threshold relationship schematic provided for the embodiment of the present application;

[0032] Figure 15 Another electronic expansion valve opening and threshold relationship schematic provided for the embodiment of the present application;

[0033] Figure 16 Another controller configuration schematic provided for the embodiment of the present application. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0035] It should be noted that all directional indications, such as up, down, left, right, front, back, etc., in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0036] The terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified and limited, the meaning of "a plurality of" is two or more.

[0037] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or detachably connected, or integrally connected. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, when describing the pipeline, the "connected" and "connected" used in the present application have the meaning of conducting. The specific meaning needs to be understood in combination with the context.

[0038] In embodiments of the present invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in embodiments of the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0039] An electronic expansion valve is a throttling element that can regulate the flow of refrigerant entering a refrigeration unit according to a preset program. (See attached image) Figure 1 As shown, attached Figure 1 The internal structure of an electronic expansion valve provided in an embodiment of this application is shown.

[0040] See attached document Figure 1 The electronic expansion valve 1 includes a rotor 11, a valve stem 12, a valve needle 13, a valve body 14, and a stator 15. The valve body 14 is typically made of corrosion-resistant and oxidation-resistant brass, serving as the outer shell of the electronic expansion valve 1 to protect the internal components. The opening degree of the electronic expansion valve 1 is adjusted by controlling the valve orifice opening through the valve stem 12. The valve needle 13 is connected to the valve stem 12, and the rotor 11 is also connected to the valve stem 12, acting as the rotor of a synchronous motor. Controlling the movement of the connected valve stem 12 changes the valve orifice opening. In this process, the energy required to control the movement of the valve stem 12 comes from the stator 15. The stator 15 converts electrical energy into magnetic energy to drive the rotor 11 to rotate. The rotation of the rotor 11, in turn, moves the valve stem 12, thus adjusting the valve orifice opening.

[0041] Electronic expansion valves require extremely short times to transition from a fully closed to a fully open state, often only a few seconds, exhibiting extremely fast reaction and action speeds. In some embodiments, as shown in the attached... Figure 2 As shown, attached Figure 2 The diagram shows the connection between the electronic expansion valve and the controller.

[0042] See attached document Figure 2 The electronic expansion valve 1 is connected to the controller 2. The controller 2 is programmed with a pre-set program, such as a program that controls the number of steps to increase or decrease the opening of the electronic expansion valve 1 and the speed of the increase or decrease. Therefore, the controller 2 can achieve precise control over the opening and closing characteristics, the number of steps to increase or decrease the opening, and the speed of the increase or decrease.

[0043] Since an electronic expansion valve is a throttling element that can regulate the flow of refrigerant into a refrigeration unit according to a preset program, and air conditioners account for a large proportion of the refrigeration units used in people's daily lives, electronic expansion valves are widely used in air conditioners.

[0044] In some embodiments, the components of the air conditioner are as shown in FIG. 1. Referring to FIG. 1, the air conditioner 10 includes a compressor 3, a condenser 4, and an evaporator 5. Figure 3 In some embodiments, the components of the air conditioner are as shown in FIG. 1. Referring to FIG. 1, the air conditioner 10 includes a compressor 3, a condenser 4, and an evaporator 5. Figure 3 In some embodiments, the components of the air conditioner are as shown in FIG. 1. Referring to FIG. 1, the air conditioner 10 includes a compressor 3, a condenser 4, and an evaporator 5.

[0045] In some embodiments, the components of the air conditioner are as shown in FIG. 1. Referring to FIG. 1, the air conditioner 10 includes a compressor 3, a condenser 4, and an evaporator 5. Figure 4 In some embodiments, the components of the air conditioner are as shown in FIG. 1. Referring to FIG. 1, the air conditioner 10 includes a compressor 3, a condenser 4, and an evaporator 5. Figure 4 In some embodiments, the components of the air conditioner are as shown in FIG. 1. Referring to FIG. 1, the air conditioner 10 includes a compressor 3, a condenser 4, and an evaporator 5.

[0046] In some embodiments, the components of the air conditioner are as shown in FIG. 1. Referring to FIG. 1, the air conditioner 10 includes a compressor 3, a condenser 4, and an evaporator 5.

[0047] In some embodiments, the components of the air conditioner are as shown in FIG. 1. Referring to FIG. 1, the air conditioner 10 includes a compressor 3, a condenser 4, and an evaporator 5. Figure 5 In some embodiments, the components of the air conditioner are as shown in FIG. 1. Referring to FIG. 1, the air conditioner 10 includes a compressor 3, a condenser 4, and an evaporator 5. Figure 5 In some embodiments, the components of the air conditioner are as shown in FIG. 1. Referring to FIG. 1, the air conditioner 10 includes a compressor 3, a condenser 4, and an evaporator 5. Figure 3 In some embodiments, the components of the air conditioner are as shown in FIG. 1. Referring to FIG. 1, the air conditioner 10 includes a compressor 3, a condenser 4, and an evaporator 5. Figure 5 In some embodiments, the components of the air conditioner are as shown in FIG. 1. Referring to FIG. 1, the air conditioner 10 includes a compressor 3, a condenser 4, and an evaporator 5.

[0048] In some embodiments, the components of the air conditioner are as shown in FIG. 1. Referring to FIG. 1, the air conditioner 10 includes a compressor 3, a condenser 4, and an evaporator 5.

[0049] However, the existing air conditioner often uses a single limit value in the controller to control the adjustment of the opening size of the electronic expansion valve, and the over-rough control often causes over-adjustment and under-adjustment of the electronic expansion valve. The under-adjustment and over-adjustment of the air conditioner electronic expansion valve are compared with the most appropriate adjustment of the electronic expansion valve. For example, the indoor room temperature is rising due to the rising outdoor temperature, and the heat absorbed by the original air conditioner refrigerant discharge cannot keep up with the rising indoor room temperature, so the air conditioner needs to increase the refrigerant discharge to maintain the constant indoor temperature. However, in order to increase the refrigerant discharge to make the air conditioner achieve the effect of maintaining the constant indoor temperature, the opening of the electronic expansion valve should be increased by 50 degrees, but the actual opening of the electronic expansion valve controlled by the controller is only increased by 30 degrees, which is called under-adjustment of the electronic expansion valve. Whether the under-adjustment or over-adjustment of the electronic expansion valve will make the air conditioner not in the optimal operating state, and the power consumption is large.

[0050] Therefore, the embodiment of the present application makes the following solution to the above problems. The main components of the air conditioner are still as shown in the accompanying Figure 5 However, the embodiment of the present application further limits the configuration of the controller connected with the electronic expansion valve of the air conditioner, as shown in the accompanying Figure 6

[0051] Referring to the accompanying Figure 6 , the controller is configured to:

[0052] S1: In the case that the outdoor ring temperature is greater than the first preset temperature, and the compressor runs for a preset time length, if the discharge temperature of the compressor at the previous moment is greater than or equal to the discharge temperature of the compressor at the current moment, the opening increment / decrement step number of the electronic expansion valve is controlled to be between 0 and the first increment / decrement step number, and the first increment / decrement step number is EVO(n-1) / a, where a is a constant and EVO(n-1) is the opening of the electronic expansion valve at the previous moment.

[0053] S2: In the case that the outdoor ring temperature is less than or equal to the first preset temperature, and the compressor runs for a preset time length, if the discharge temperature of the compressor at the previous moment is less than or equal to the discharge temperature of the compressor at the current moment, the opening increment / decrement step number of the electronic expansion valve is controlled to be between 0 and the second increment / decrement step number, and the second increment / decrement step number is EVO(n-1) / c, where c is a constant.

[0054] It should be noted that S1 and S2 refer to two different situations and the specific configuration of the controller 2 to the opening increment / decrement step number of the electronic expansion valve under the two different situations.

[0055] ​After the compressor has been running for a period of time, the controller compares the compressor's discharge temperature at fixed intervals to determine how the electronic expansion valve opening should be adjusted, limiting the upper and lower limits of the number of steps the electronic expansion valve can take to increase or decrease its opening. If the compressor's discharge temperature at the previous moment is greater than or equal to the current moment's discharge temperature, the controller controls the electronic expansion valve opening to increase or decrease between 0 and the first increase / decrease step. If the compressor's discharge temperature at the previous moment is less than or equal to the current moment's discharge temperature, the controller controls the electronic expansion valve opening to increase or decrease between 0 and the second increase / decrease step. This ensures that the air conditioner is always in a stable and optimal state during operation, resulting in higher cooling and heating efficiency while reducing energy consumption.

[0056] In order to enable the controller to make more precise control over the number of steps to increase or decrease the opening of the electronic expansion valve in more complex situations, the embodiments of this application cover two major situations: when the outdoor ambient temperature is greater than the first preset temperature and the compressor runs for a preset time, and when the outdoor ambient temperature is less than or equal to the first preset temperature and the compressor runs for a preset time.

[0057] For example, such as Figure 7 As shown, Figure 7 A more specific configuration of the controller is shown. (Refer to...) Figure 7 When the outdoor ambient temperature is higher than the first preset temperature and the compressor has been running for a preset duration, controller 2 is also configured to:

[0058] S11: When the air conditioner is running in the first mode, and the opening degree of the electronic expansion valve is greater than the first threshold at the previous moment, the upper limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is EVO(n-1) / b. 21 , where b 21 It is a constant.

[0059] S12: When the air conditioner is running in the first mode, and the opening degree of the electronic expansion valve at the previous moment is greater than the second threshold and less than or equal to the first threshold, the upper limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is EVO(n-1) / b. 22 , where b 22 It is a constant.

[0060] S13: When the air conditioner is running in the first mode, and the opening degree of the electronic expansion valve at the previous moment is less than or equal to the second threshold, the upper limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is EVO(n-1) / b. 23 , where b 23 It is a constant.

[0061] S14: When the air conditioner is running in the second mode, and the opening degree of the electronic expansion valve is greater than the second threshold at the previous moment, the upper limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is EVO(n-1) / b.24 wherein b 24 is a constant.

[0062] S15: When the air conditioner is running in the second mode, and the opening degree of the electronic expansion valve at the previous moment is less than or equal to the second threshold value, the upper limit of the step number of the opening degree of the electronic expansion valve is EVO(n-1) / b 25 wherein b 25 is a constant.

[0063] It should be noted that the first mode of the air conditioner and the second mode of the air conditioner are two different modes of the air conditioner, and the two different modes have different running modes. The above embodiment illustrates that in the case that the outdoor ring temperature is greater than the first preset temperature and the compressor runs for a preset time length, the controller controls the upper limit value of the step number of the opening degree of the electronic expansion valve in the two different running states of the air conditioner, respectively.

[0064] Reference is made to Figure 8 , attached Figure 9 and attached Figure 10 , attached Figure 8 shows the relationship between the first threshold value and the second threshold value. Attached Figure 9 and attached Figure 10 respectively show the case division of the controller when the air conditioner is in the first mode and the second mode.

[0065] Referring to attached Figure 9 , in the case that the air conditioner is running in the first mode, according to the comparison between the opening degree of the electronic expansion valve at the previous moment and the first threshold value and the second threshold value, three cases are again divided, that is, the opening degree of the electronic expansion valve at the previous moment is greater than the second threshold value, less than or equal to the first threshold value, the opening degree of the electronic expansion valve at the previous moment is less than or equal to the second threshold value, and the opening degree of the electronic expansion valve at the previous moment is greater than the first threshold value. The opening degree of the electronic expansion valve at the previous moment is greater than the second threshold value, less than or equal to the first threshold value, which corresponds to (a) in attached Figure 9 . The opening degree of the electronic expansion valve at the previous moment is less than or equal to the second threshold value, which corresponds to (b) in attached Figure 9 . The opening degree of the electronic expansion valve at the previous moment is greater than the first threshold value, which corresponds to (c) in attached Figure 9 .

[0066] Referring to attached Figure 10 , in the case that the air conditioner is running in the second mode, according to the comparison between the opening degree of the electronic expansion valve at the previous moment and the first threshold value and the second threshold value, two cases are again divided, that is, the opening degree of the electronic expansion valve at the previous moment is greater than the second threshold value, and the opening degree of the electronic expansion valve at the previous moment is less than or equal to the second threshold value. The opening degree of the electronic expansion valve at the previous moment is greater than the second threshold value, which corresponds to (a) in attached Figure 10 . The opening degree of the electronic expansion valve at the previous moment is less than or equal to the second threshold value, which corresponds to (b) in attachedFigure 10 Figure (b) in the middle.

[0067] To provide a more intuitive and clear illustration of the situations described in the above embodiments, as well as the upper and lower limits of the number of steps for increasing or decreasing the opening of the electronic expansion valve, when the outdoor ambient temperature is greater than the first preset temperature and the compressor has been running for a preset duration, please refer to Table 1 below.

[0068]

[0069] Table 1

[0070] In the table, EVO(n-1) represents the opening degree of the electronic expansion valve at the previous moment, U1 represents the first threshold, and U2 represents the second threshold.

[0071] It should be noted that the positive sign in the lower limit of the number of steps to increase or decrease the opening of the electronic expansion valve mentioned above indicates that the opening of the electronic expansion valve needs to be increased compared with the opening of the electronic expansion valve at the previous moment, while the negative sign in the lower limit of the number of steps to increase or decrease the opening of the electronic expansion valve indicates that the opening of the electronic expansion valve needs to be decreased compared with the opening of the electronic expansion valve at the previous moment.

[0072] The above embodiments only limit the upper limit of the number of steps for increasing or decreasing the opening of the electronic expansion valve. The setting of the lower limit of the number of steps for increasing or decreasing the opening of the electronic expansion valve will be explained below.

[0073] For example, see attached Figure 11 As shown, attached Figure 11 Further configuration of the controller is shown. See Appendix. Figure 11 The controller is also configured as follows:

[0074] S111: When the air conditioner is operating in the first mode, and the opening degree of the electronic expansion valve was greater than the first threshold at the previous moment, if the first condition is met, the lower limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is b. 16 , where b 16 It is a constant. If the second condition is met, the lower limit of the number of steps for increasing or decreasing the opening of the electronic expansion valve is -EVO(n-1) / b. 11 , where b 11 b6 is a constant. If the third condition is met, the lower limit of the number of steps for increasing or decreasing the opening of the electronic expansion valve is -EVO(n-1) / b6, where b6 is a constant. If the fourth condition is met, the lower limit of the number of steps for increasing or decreasing the opening of the electronic expansion valve is -EVO(n-1) / b1, where b1 is a constant.

[0075] S121: When the air conditioner is running in the first mode, and the opening degree of the electronic expansion valve at the previous moment is greater than the second threshold value, and less than or equal to the first threshold value, if the first condition is met, the lower limit of the opening degree increment / decrement step number of the electronic expansion valve is b 17 , where b 17 is a constant. If the second condition is met, the lower limit of the opening degree increment / decrement step number of the electronic expansion valve is -EVO(n-1) / b 12 , where b 12 is a constant. If the third condition is met, the lower limit of the opening degree increment / decrement step number of the electronic expansion valve is -EVO(n-1) / b7, where b7 is a constant. If the fourth condition is met, the lower limit of the opening degree increment / decrement step number of the electronic expansion valve is -EVO(n-1) / b2, where b2 is a constant.

[0076] S131: When the air conditioner is running in the first mode, and the opening degree of the electronic expansion valve at the previous moment is less than or equal to the second threshold value, if the first condition is met, the lower limit of the opening degree increment / decrement step number of the electronic expansion valve is b 18 , where b 18 is a constant. If the second condition is met, the lower limit of the opening degree increment / decrement step number of the electronic expansion valve is -b 13 , where b 13 is a constant. If the third condition is met, the lower limit of the opening degree increment / decrement step number of the electronic expansion valve is -b8, where b8 is a constant. If the fourth condition is met, the lower limit of the opening degree increment / decrement step number of the electronic expansion valve is -b3, where b3 is a constant.

[0077] S141: When the air conditioner is running in the second mode, and the opening degree of the electronic expansion valve at the previous moment is greater than the second threshold value, if the first condition is met, the lower limit of the opening degree increment / decrement step number of the electronic expansion valve is b 19 , where b 19 is a constant. If the second condition is met, the lower limit of the opening degree increment / decrement step number of the electronic expansion valve is -b 14 , where b 14 is a constant. If the third condition is met, the lower limit of the opening degree increment / decrement step number of the electronic expansion valve is -EVO(n-1) / b9, where b9 is a constant. If the fourth condition is met, the lower limit of the opening degree increment / decrement step number of the electronic expansion valve is -EVO(n-1) / b4, where b4 is a constant.

[0078] S151: When the air conditioner is running in the second mode, and the opening degree of the electronic expansion valve at the previous moment is less than or equal to the second threshold value, if the first condition is met, the lower limit of the opening degree increment / decrement step number of the electronic expansion valve is b 20 , where b 20 is a constant. If the second condition is met, the lower limit of the opening degree increment / decrement step number of the electronic expansion valve is -b 15wherein b 15 is a constant. If the third condition is satisfied, the lower limit of the opening degree step-up or step-down number of the electronic expansion valve is -b 10 wherein b 10 is a constant. If the fourth condition is satisfied, the lower limit of the opening degree step-up or step-down number of the electronic expansion valve is -b5, wherein b5 is a constant.

[0079] The first condition includes that the difference between the current temperature and the saturation temperature corresponding to the compressor discharge pressure is greater than or equal to k, and the low-pressure value of the compressor is less than or equal to the low-pressure protection control value or the pressure ratio is greater than or equal to n, wherein k and n are constants. The second condition includes that the difference between the current temperature and the saturation temperature corresponding to the compressor discharge pressure is greater than or equal to h, and the low-pressure value of the compressor is less than or equal to the sum of the low-pressure protection control value and i or the pressure ratio is greater than or equal to j, wherein h, i, and j are constants. The third condition includes that the difference between the current temperature and the saturation temperature corresponding to the compressor discharge pressure is greater than or equal to e, and the low-pressure value of the compressor is less than or equal to the sum of the low-pressure protection control value and f or the pressure ratio is greater than or equal to g, wherein e, f, and g are constants. The fourth condition includes the remaining cases other than the first condition, the second condition, and the third condition.

[0080] It should be noted that the first condition, the second condition, the third condition, and the fourth condition described above are determined according to the risk level, and have a priority order, which decreases from the first condition to the second condition, the third condition, and the fourth condition. This means that when the first condition is satisfied, the risk level of the air conditioner is the highest, and when the air conditioner satisfies the remaining conditions including the first condition, the lower limit value of the opening degree step-up or step-down number of the electronic expansion valve is determined according to the lower limit value under the first condition. The processing mode of the remaining conditions is the same, and will not be described here.

[0081] For example, although the outdoor ambient temperature is greater than the first preset temperature, the compressor has operated for a preset time length, and when the air conditioner operates in the first mode, the opening degree of the electronic expansion valve at the previous time is greater than the second threshold value and less than or equal to the first threshold value, the first condition and the second condition may be satisfied at the same time. In this case, the opening degree step-up or step-down number of the electronic expansion valve should be the value under the first condition, i.e., b 17 . Similarly, when more than one condition is satisfied at the same time, the lower limit value of the opening degree step-up or step-down number of the electronic expansion valve should be determined according to the lower limit value corresponding to the condition with the highest priority,

[0082] The three standards for measuring whether the first condition, the second condition, the third condition and the fourth condition mentioned above are satisfied are mainly the difference between the current temperature and the saturation temperature corresponding to the compressor discharge pressure, the comparison between the low-pressure pressure value of the compressor and the low-pressure protection control value, and the pressure ratio. Among them, the comparison between the low-pressure pressure value of the compressor and the low-pressure protection control value and the pressure ratio belong to different means of judging the same index, so the "or" relationship is used.

[0083] Specifically, the difference between the current temperature and the saturation temperature corresponding to the compressor discharge pressure can reflect the supercooling degree of the condenser. There is a saturation temperature value corresponding to each compressor discharge pressure value, and the supercooling degree of the condenser can affect the condensation process.

[0084] The air conditioner in the most ideal state is not a static state, that is, each parameter will not remain unchanged, but is in a state of dynamic balance. The discharge pressure value of the compressor actually reflects the amount of refrigerant gas discharged by the compressor. When the difference between the saturation temperature corresponding to the current compressor discharge pressure value and the current temperature value reflects that the current condenser condensation effect is insufficient, it means that the condensation is not enough, and the opening degree of the electronic expansion valve needs to be increased. When the difference between the saturation temperature corresponding to the current compressor discharge pressure value and the current temperature value reflects that the current condenser condensation effect is too strong, the opening degree of the electronic expansion valve needs to be reduced.

[0085] The comparison between the low-pressure pressure value of the compressor and the low-pressure protection control value and the pressure ratio can reflect the state of the compressor. The formula for calculating the pressure ratio is the division operation of the high-pressure pressure value and the low-pressure pressure value. The low-pressure protection value of the compressor is a parameter of the compressor. When it is lower than the low-pressure protection value, it means that the pressure value of the compressor is too low, which may cause the compressor to frost, thereby affecting the working efficiency of the compressor.

[0086] It should be noted that the high-pressure pressure value can be calculated by formula derivation according to the output temperature of the evaporator, and the low-pressure pressure value can be calculated by formula derivation according to the output temperature of the condenser. The high-pressure pressure value and the low-pressure pressure value can also be obtained by setting temperature sensors on the compressor. The discharge pressure value of the compressor is calculated by formula derivation through the temperature of the condenser, and can also be obtained by setting temperature sensors on the compressor. The discharge pressure value of the compressor is different from the low-pressure pressure value and the high-pressure pressure value in that the measured positions are not the same.

[0087] It should be noted that the above embodiment is a description of the configuration of the controller in the first large case, i.e. when the outdoor ambient temperature is greater than the first preset temperature and the compressor runs for a preset length of time. The "current time" and "previous time" mentioned in the above embodiment refer to the measurement of two data at a fixed time interval, for example, the ratio of the current opening degree of the electronic expansion valve to the previous opening degree of the electronic expansion valve means comparing the opening degrees of the electronic expansion valve at a fixed time interval.

[0088] The second large case, i.e. when the outdoor ambient temperature is less than or equal to the first preset temperature and the compressor runs for a preset length of time, will be described below.

[0089] For example, as shown in FIG. 2, the specific configuration of the controller is shown. Figure 12 As shown in FIG. 2, the specific configuration of the controller is shown. Figure 12 As shown in FIG. 2, the specific configuration of the controller is shown. Figure 12 When the outdoor ambient temperature is less than or equal to the first preset temperature and the compressor runs for a preset length of time, the controller is further configured to:

[0090] S21: When the air conditioner is running in the first mode, and the opening degree of the electronic expansion valve at the previous time is greater than the third threshold value, the upper limit of the opening degree increment / decrement step number of the electronic expansion valve is controlled to be EVO(n-1) / d 21 , where d 21 is a constant.

[0091] S22: When the air conditioner is running in the first mode, and the opening degree of the electronic expansion valve at the previous time is greater than the fourth threshold value and less than or equal to the third threshold value, the upper limit of the opening degree increment / decrement step number of the electronic expansion valve is controlled to be EVO(n-1) / d 22 , where d 22 is a constant.

[0092] S23: When the air conditioner is running in the first mode, and the opening degree of the electronic expansion valve at the previous time is less than or equal to the fourth threshold value, the upper limit of the opening degree of the electronic expansion valve is controlled to be EVO(n-1) / d 23 , where d 23 is a constant.

[0093] S24: When the air conditioner is running in the second mode, and the opening degree of the electronic expansion valve at the previous time is greater than the fourth threshold value, the upper limit of the opening degree increment / decrement step number of the electronic expansion valve is controlled to be EVO(n-1) / d 24 , where d 24 is a constant.

[0094] S25: When the air conditioner is running in the second mode, and the opening degree of the electronic expansion valve at the previous time is less than or equal to the fourth threshold value, the upper limit of the opening degree increment / decrement step number of the electronic expansion valve is controlled to be EVO(n-1) / d 25 , where d25 is constant.

[0095] Reference is made to the accompanying drawings that show Figure 13 , the accompanying Figure 14 and the accompanying Figure 15 , the accompanying Figure 13 shows the relationship between the second threshold value and the third threshold value. The accompanying Figure 4 and the accompanying Figure 15 show the case division of the controller when the air conditioner is in the first mode and the second mode, respectively.

[0096] Reference is made to the accompanying Figure 14 , in the case where the air conditioner is running in the first mode, the opening degree of the electronic expansion valve at the previous moment is compared with the third threshold value and the fourth threshold value again, and three cases are divided again, i.e. the opening degree of the electronic expansion valve at the previous moment is greater than the fourth threshold value, less than or equal to the third threshold value, the opening degree of the electronic expansion valve at the previous moment is less than or equal to the fourth threshold value, and the opening degree of the electronic expansion valve at the previous moment is greater than the third threshold value. The opening degree of the electronic expansion valve at the previous moment is greater than the fourth threshold value, less than or equal to the third threshold value, which corresponds to (a) of the accompanying Figure 14 . The opening degree of the electronic expansion valve at the previous moment is less than or equal to the fourth threshold value, which corresponds to (b) of the accompanying Figure 14 . The opening degree of the electronic expansion valve at the previous moment is greater than the third threshold value, which corresponds to (c) of the accompanying Figure 14 .

[0097] Reference is made to the accompanying Figure 15 , in the case where the air conditioner is running in the second mode, the opening degree of the electronic expansion valve at the previous moment is compared with the third threshold value and the fourth threshold value again, and two cases are divided again, i.e. the opening degree of the electronic expansion valve at the previous moment is greater than the fourth threshold value, and the opening degree of the electronic expansion valve at the previous moment is less than or equal to the fourth threshold value. The opening degree of the electronic expansion valve at the previous moment is greater than the fourth threshold value, which corresponds to (a) of the accompanying Figure 15 . The opening degree of the electronic expansion valve at the previous moment is less than or equal to the fourth threshold value, which corresponds to (b) of the accompanying Figure 15 .

[0098] The above embodiment only limits the upper limit of the opening degree increment / decrement step number of the electronic expansion valve, and the setting of the lower limit of the opening degree increment / decrement step number of the electronic expansion valve will be described below.

[0099] For example, as shown in the accompanying Figure 16 , the accompanying Figure 16 shows a further configuration of the controller. Referring to the accompanying Figure 16 , the controller is further configured to:

[0100] S211: when the air conditioner is running in the first mode, and the opening degree of the electronic expansion valve at the previous moment is greater than the third threshold value, if the first condition is met, the lower limit of the opening degree increment / decrement step number of the electronic expansion valve is d16 where d 16 is a constant. If the second condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is -EVO(n-1) / d 11 where d 11 is a constant. If the third condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is -EVO(n-1) / d6, where d6 is a constant. If the fourth condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is -EVO(n-1) / d1, where d1 is a constant.

[0101] S221: When the air conditioner is operated in the first mode, and the opening degree of the electronic expansion valve at the previous time is greater than the fourth threshold value and less than or equal to the third threshold value, if the first condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is d 17 where d 17 is a constant. If the second condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is -EVO(n-1) / d 12 where d 12 is a constant. If the third condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is -EVO(n-1) / d7, where d7 is a constant. If the fourth condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is -EVO(n-1) / d2, where d2 is a constant.

[0102] S231: When the air conditioner is operated in the first mode, and the opening degree of the electronic expansion valve at the previous time is less than or equal to the fourth threshold value, if the first condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is d 18 where d 18 is a constant. If the second condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is -d 13 where d 13 is a constant. If the third condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is -d8, where d8 is a constant. If the fourth condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is -d3, where d3 is a constant.

[0103] S241: When the air conditioner is operated in the second mode, and the opening degree of the electronic expansion valve at the previous time is greater than the fourth threshold value, if the first condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is d 19 where d 19 is a constant. If the second condition is satisfied, the lower limit of the opening degree step number of the electronic expansion valve is -d 14 where d 14is a constant. If the third condition is met, the lower limit of the opening degree step number of the electronic expansion valve is -EVO(n-1) / d9, where d9 is a constant. If the fourth condition is met, the lower limit of the opening degree step number of the electronic expansion valve is -EVO(n-1) / d4, where d4 is a constant.

[0104] S251: When the air conditioner is running in the second mode, and the opening degree of the electronic expansion valve at the previous time is less than or equal to the fourth threshold value, if the first condition is met, the lower limit of the opening degree step number of the electronic expansion valve is d 20 , where d 20 is a constant. If the second condition is met, the lower limit of the opening degree step number of the electronic expansion valve is -d 15 , where d 15 is a constant. If the third condition is met, the lower limit of the opening degree step number of the electronic expansion valve is -b 10 , where d 10 is a constant. If the fourth condition is met, the lower limit of the opening degree step number of the electronic expansion valve is -b5, where d5 is a constant.

[0105] The first condition includes: the difference between the current temperature and the saturation temperature corresponding to the compressor discharge pressure is greater than or equal to k, and the low pressure value of the compressor is less than or equal to the low pressure protection control value or the pressure ratio is greater than or equal to n, where k and n are constants. The second condition includes: the difference between the current temperature and the saturation temperature corresponding to the compressor discharge pressure is greater than or equal to h, and the low pressure value of the compressor is less than or equal to the sum of the low pressure protection control value and i or the pressure ratio is greater than or equal to j, where h, i, and j are constants. The third condition includes: the difference between the current temperature and the saturation temperature corresponding to the compressor discharge pressure is greater than or equal to e, and the low pressure value of the compressor is less than or equal to the sum of the low pressure protection control value and f or the pressure ratio is greater than or equal to g, where e, f, and g are constants. The fourth condition includes the remaining cases other than the first, second, and third conditions.

[0106] In order to more intuitively and clearly show the situation and the upper and lower limit values of the opening degree step number of the electronic expansion valve in the case that the outdoor ambient temperature is less than or equal to the first preset temperature and the compressor has run for a preset length of time, reference can be made to Table 2 as shown below:

[0107]

[0108] Table 2

[0109] EVO(n-1) appearing in the table represents the opening degree of the electronic expansion valve at the previous time, V1 represents the third threshold value, and V2 represents the fourth threshold value.

[0110] It should be noted that the positive sign appearing in the lower limit of the opening degree increase / decrease step number of the electronic expansion valve mentioned above indicates that the opening degree of the electronic expansion valve needs to be increased compared with the opening degree of the electronic expansion valve at the previous moment, and the negative sign appearing in the lower limit of the opening degree increase / decrease step number of the electronic expansion valve indicates that the opening degree of the electronic expansion valve needs to be decreased compared with the opening degree of the electronic expansion valve at the previous moment.

[0111] The air conditioner provided by the embodiments of the present application can intelligently adjust the opening degree of the electronic expansion valve under different conditions, the upper and lower limits of the opening degree increase / decrease step number of the electronic expansion valve are controlled by the controller to ensure that the air conditioner always operates under a relatively optimal configuration, as long as the opening degree of the electronic expansion valve is controlled within the upper and lower limits of the increase / decrease step number under the set condition, the stable and efficient operation of the air conditioner can be ensured, the energy consumption of the air conditioner is reduced, and the use experience of the user is improved.

[0112] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed by the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An air conditioner, characterized in that, The air conditioner includes: a compressor; a condenser and an evaporator, the compressor and the condenser being connected, the compressor being configured to discharge fluid to the condenser, the condenser and the evaporator being connected, the condenser being configured to supply condensate to the evaporator; the evaporator being connected to the compressor, the evaporator being configured to discharge fluid to the compressor; the air conditioner further includes: An electronic expansion valve is connected between the condenser and the evaporator; A controller, connected to the electronic expansion valve, is configured to: If the outdoor ambient temperature is greater than the first preset temperature and the compressor has been running for a preset time, and if the compressor's exhaust temperature at the previous moment is greater than or equal to the compressor's exhaust temperature at the current moment, then the opening of the electronic expansion valve is controlled to increase or decrease in steps between 0 and the first increase or decrease step, where the first increase or decrease step is EVO(n-1) / a, where a is a constant and EVO(n-1) is the opening of the electronic expansion valve at the previous moment. When the outdoor ambient temperature is less than or equal to the first preset temperature and the compressor has been running for a preset duration, if the compressor's exhaust temperature at the previous moment is less than or equal to the compressor's exhaust temperature at the current moment, then the opening of the electronic expansion valve is controlled to increase or decrease by a number of steps between 0 and a second number of steps, where the second number of steps is EVO(n-1) / c, and c is a constant.

2. The air conditioner according to claim 1, characterized in that, When the outdoor ambient temperature is greater than a first preset temperature and the compressor has been running for a preset duration, the controller is further configured to: When the air conditioner is operating in the first mode, and the opening degree of the electronic expansion valve is greater than the first threshold at the previous moment, the upper limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is EVO(n-1) / b. 21 , where b 21 It is a constant; When the air conditioner is operating in the first mode, and the opening degree of the electronic expansion valve at the previous moment is greater than the second threshold and less than or equal to the first threshold, the upper limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is EVO(n-1) / b. 22 , where b 22 It is a constant; When the air conditioner is operating in the first mode, and the opening degree of the electronic expansion valve at the previous moment is less than or equal to the second threshold, the upper limit of the number of steps for increasing or decreasing the opening degree of the electronic expansion valve is EVO(n-1) / b. 23 , where b 23 It is a constant; When the air conditioner is operating in the second mode, and the opening degree of the electronic expansion valve is greater than the second threshold at the previous moment, the upper limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is EVO(n-1) / b. 24 , where b 24 It is a constant; When the air conditioner is operating in the second mode, and the opening degree of the electronic expansion valve at the previous moment is less than or equal to the second threshold, the upper limit of the number of steps for increasing or decreasing the opening degree of the electronic expansion valve is EVO(n-1) / b. 25 , where b 25 It is a constant.

3. The air conditioner according to claim 2, characterized in that, The controller is also configured to: When the air conditioner is operating in the first mode, and the opening degree of the electronic expansion valve was greater than the first threshold at the previous moment, if the first condition is met, then the lower limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is b. 16 , where b 16 It is a constant; if the second condition is met, the lower limit of the number of steps for increasing or decreasing the opening of the electronic expansion valve is -EVO(n-1) / b. 11 , where b 11 If the third condition is met, the lower limit of the number of steps to increase or decrease the opening of the electronic expansion valve is -EVO(n-1) / b6, where b6 is a constant; if the fourth condition is met, the lower limit of the number of steps to increase or decrease the opening of the electronic expansion valve is -EVO(n-1) / b1, where b1 is a constant. When the air conditioner is operating in the first mode, and the opening degree of the electronic expansion valve at the previous moment is greater than the second threshold and less than or equal to the first threshold, if the first condition is met, then the lower limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is b. 17 , where b 17 It is a constant; if the second condition is met, the lower limit of the number of steps for increasing or decreasing the opening of the electronic expansion valve is -EVO(n-1) / b. 12 , where b 12 If the third condition is met, the lower limit of the number of steps to increase or decrease the opening of the electronic expansion valve is -EVO(n-1) / b7, where b7 is a constant; if the fourth condition is met, the lower limit of the number of steps to increase or decrease the opening of the electronic expansion valve is -EVO(n-1) / b2, where b2 is a constant. When the air conditioner is operating in the first mode, and the opening degree of the electronic expansion valve at the previous moment is less than or equal to the second threshold, if the first condition is met, then the lower limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is b. 18 , where b 18 It is a constant; if the second condition is met, the lower limit of the number of steps for increasing or decreasing the opening of the electronic expansion valve is -b. 13 , where b 13 If the third condition is met, the lower limit of the number of steps to increase or decrease the opening of the electronic expansion valve is -b8, where b8 is a constant; if the fourth condition is met, the lower limit of the number of steps to increase or decrease the opening of the electronic expansion valve is -b3, where b3 is a constant. The first condition includes: the difference between the current temperature and the saturation temperature corresponding to the compressor discharge pressure is greater than or equal to k, and the low pressure value of the compressor is less than or equal to the low pressure protection control value or the pressure ratio is greater than or equal to n, where k and n are constants; The second condition includes: the difference between the current temperature and the saturation temperature corresponding to the compressor discharge pressure is greater than or equal to h, and the low pressure value of the compressor is less than or equal to the sum of the low pressure protection control value and i, or the pressure ratio is greater than or equal to j, where h, i, and j are constants; The third condition includes: the difference between the current temperature and the saturation temperature corresponding to the compressor discharge pressure is greater than or equal to e, and the low pressure value of the compressor is less than or equal to the sum of the low pressure protection control value and f, or the pressure ratio is greater than or equal to g, where e, f, and g are constants; The fourth condition includes all other cases besides the first, second, and third conditions.

4. The air conditioner according to claim 3, characterized in that, The controller is also configured to: When the air conditioner is operating in the second mode, and the opening degree of the electronic expansion valve was greater than the second threshold at the previous moment, if the first condition is met, then the lower limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is b. 19 , where b 19 It is a constant; if the second condition is met, the lower limit of the number of steps for increasing or decreasing the opening of the electronic expansion valve is -b. 14 , where b 14 If the third condition is met, the lower limit of the number of steps to increase or decrease the opening of the electronic expansion valve is -EVO(n-1) / b9, where b9 is a constant; if the fourth condition is met, the lower limit of the number of steps to increase or decrease the opening of the electronic expansion valve is -EVO(n-1) / b4, where b4 is a constant. When the air conditioner is operating in the second mode, and the opening degree of the electronic expansion valve at the previous moment is less than or equal to the second threshold, if the first condition is met, then the lower limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is b. 20 , where b 20 It is a constant; if the second condition is met, the lower limit of the number of steps for increasing or decreasing the opening of the electronic expansion valve is -b. 15 , where b 15 It is a constant; if the third condition is met, the lower limit of the number of steps for increasing or decreasing the opening of the electronic expansion valve is -b. 10 , where b 10 b5 is a constant; if the fourth condition is met, the lower limit of the number of steps to increase or decrease the opening of the electronic expansion valve is -b5, where b5 is a constant.

5. The air conditioner according to claim 1, characterized in that, When the outdoor ambient temperature is less than or equal to a first preset temperature, and the compressor has been running for a preset duration, the controller is further configured to: When the air conditioner is operating in the first mode, and the opening degree of the electronic expansion valve is greater than the third threshold at the previous moment, the upper limit of the number of steps for increasing or decreasing the opening degree of the electronic expansion valve is EVO(n-1) / d. 21 , where d 21 It is a constant; When the air conditioner is operating in the first mode, and the opening degree of the electronic expansion valve at the previous moment is greater than the fourth threshold and less than or equal to the third threshold, the upper limit of the number of steps for increasing or decreasing the opening degree of the electronic expansion valve is EVO(n-1) / d. 22 , where d 22 It is a constant; When the air conditioner is operating in the first mode, and the opening degree of the electronic expansion valve at the previous moment is less than or equal to the fourth threshold, the upper limit of the opening degree of the electronic expansion valve is controlled to be EVO(n-1) / d. 23 , where d 23 It is a constant; When the air conditioner is operating in the second mode, and the opening degree of the electronic expansion valve is greater than the fourth threshold at the previous moment, the upper limit of the number of steps for increasing or decreasing the opening degree of the electronic expansion valve is EVO(n-1) / d. 24 , where d 24 It is a constant; When the air conditioner is operating in the second mode, and the opening degree of the electronic expansion valve at the previous moment is less than or equal to the fourth threshold, the upper limit of the number of steps for increasing or decreasing the opening degree of the electronic expansion valve is EVO(n-1) / d. 25 , where d 25 It is a constant.

6. The air conditioner according to claim 5, characterized in that, The controller is also configured to: When the air conditioner is operating in the first mode, and the opening degree of the electronic expansion valve is greater than the third threshold at the previous moment, if the first condition is met, then the lower limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is d. 16 , where d 16 The value is a constant; if the second condition is met, the lower limit of the number of steps required to increase or decrease the opening of the electronic expansion valve is -EVO(n-1) / d. 11 , where d 11 If the third condition is met, the lower limit of the number of steps to increase or decrease the opening of the electronic expansion valve is -EVO(n-1) / d6, where d6 is a constant; if the fourth condition is met, the lower limit of the number of steps to increase or decrease the opening of the electronic expansion valve is -EVO(n-1) / d1, where d1 is a constant. When the air conditioner is operating in the first mode, and the opening degree of the electronic expansion valve at the previous moment is greater than the fourth threshold and less than or equal to the third threshold, if the first condition is met, then the lower limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is d. 17 , where d 17 The value is a constant; if the second condition is met, the lower limit of the number of steps required to increase or decrease the opening of the electronic expansion valve is -EVO(n-1) / d. 12 , where d 12 If the third condition is met, the lower limit of the number of steps to increase or decrease the opening of the electronic expansion valve is -EVO(n-1) / d7, where d7 is a constant; if the fourth condition is met, the lower limit of the number of steps to increase or decrease the opening of the electronic expansion valve is -EVO(n-1) / d2, where d2 is a constant. When the air conditioner is operating in the first mode, and the opening degree of the electronic expansion valve at the previous moment is less than or equal to the fourth threshold, if the first condition is met, then the lower limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is d. 18 , where d 18 The value is a constant; if the second condition is met, the lower limit of the number of steps required to increase or decrease the opening of the electronic expansion valve is -d. 13 , where d 13 If the third condition is met, the lower limit of the number of steps to increase or decrease the opening of the electronic expansion valve is -d8, where d8 is a constant; if the fourth condition is met, the lower limit of the number of steps to increase or decrease the opening of the electronic expansion valve is -d3, where d3 is a constant. The first condition includes: the difference between the current temperature and the saturation temperature corresponding to the compressor discharge pressure is greater than or equal to k, and the low pressure value of the compressor is less than or equal to the low pressure protection control value or the pressure ratio is greater than or equal to n, where k and n are constants; The second condition includes: the difference between the current temperature and the saturation temperature corresponding to the compressor discharge pressure is greater than or equal to h, and the low pressure value of the compressor is less than or equal to the sum of the low pressure protection control value and i, or the pressure ratio is greater than or equal to j, where h, i, and j are constants; The third condition includes: the difference between the current temperature and the saturation temperature corresponding to the compressor discharge pressure is greater than or equal to e, and the low pressure value of the compressor is less than or equal to the sum of the low pressure protection control value and f, or the pressure ratio is greater than or equal to g, where e, f, and g are constants; The fourth condition includes all other cases besides the first, second, and third conditions.

7. The air conditioner according to claim 6, characterized in that, The controller is also configured to: When the air conditioner is operating in the second mode, and the opening degree of the electronic expansion valve is greater than the fourth threshold at the previous moment, if the first condition is met, then the lower limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is d. 19 , where d 19 It is a constant; if the second condition is met, the lower limit of the number of steps for increasing or decreasing the opening of the electronic expansion valve is -d. 14 , where d 14 If the third condition is met, the lower limit of the number of steps to increase or decrease the opening of the electronic expansion valve is -EVO(n-1) / d9, where d9 is a constant; if the fourth condition is met, the lower limit of the number of steps to increase or decrease the opening of the electronic expansion valve is -EVO(n-1) / d4, where d4 is a constant. When the air conditioner is operating in the second mode, and the opening degree of the electronic expansion valve at the previous moment is less than or equal to the fourth threshold, if the first condition is met, then the lower limit of the number of steps to increase or decrease the opening degree of the electronic expansion valve is d. 20 , where d 20 It is a constant; if the second condition is met, the lower limit of the number of steps for increasing or decreasing the opening of the electronic expansion valve is -d. 15 , where d 15 It is a constant; if the third condition is met, the lower limit of the number of steps for increasing or decreasing the opening of the electronic expansion valve is -b. 10 , where d 10 If the fourth condition is met, the lower limit of the number of steps to increase or decrease the opening of the electronic expansion valve is -b5, where d5 is a constant.

8. The air conditioner according to claim 7, characterized in that, The lower limit of the opening of the electronic expansion valve corresponding to different conditions has a priority order, with the priority of the first condition, the second condition, the third condition, and the fourth condition decreasing in that order.

9. The air conditioner according to claim 1, characterized in that, The compressor is equipped with a temperature sensor configured to measure the compressor's exhaust temperature.

10. The air conditioner according to claim 1, characterized in that, The compressor is equipped with a pressure sensor configured to measure the low-pressure value of the compressor.

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