CN112283873A - Air conditioner control method, air conditioner and storage medium - Google Patents

Abstract

The invention discloses an air conditioner control method, an air conditioner and a storage medium, wherein the method comprises the following steps: acquiring an exhaust pressure value and an air outlet temperature of a compressor; determining the target opening number of the second electronic expansion valves according to the exhaust pressure value and the outlet air temperature; and controlling a plurality of second electronic expansion valves to operate according to the target opening number. According to the invention, the opening number of the second electronic expansion valves is controlled according to the exhaust pressure value and the air outlet temperature of the compressor, so that the number of the first heat exchangers participating in heat exchange of the air conditioner is controlled, when the air conditioner is in a low-temperature refrigeration state, the exhaust pressure of the compressor can be stabilized, and the compressor is prevented from being started and stopped frequently; when the air conditioner is in a high-temperature heating state, the evaporation capacity of a refrigerant and the suction capacity of the compressor can be reduced, and the condition that the exhaust pressure and the condensation pressure exceed the pressure operation range of the compressor is avoided, so that the service life of the air conditioner compressor is prolonged.

Description

Air conditioner control method, air conditioner and storage medium

Technical Field

The invention relates to the technical field of air conditioners, in particular to an air conditioner control method, an air conditioner and a storage medium.

Background

The air conditioner has a temperature adjusting function, is popular with users, and becomes a necessary household electrical appliance. With the popularization of house heating and machine room air conditioning, low-temperature refrigeration and high-temperature heating become essential functions of air conditioning in order to ensure constant temperature and humidity.

When the air conditioner is in a low-temperature refrigeration state, the heat exchange effect of the condenser is good due to low indoor and outdoor temperatures, so that the exhaust pressure and the condensation pressure are too low, and the outdoor machine can frequently enter a start-stop state in order to ensure that the exhaust pressure of the compressor is in an operation range; when the air conditioner is in a high-temperature heating state, because the indoor and outdoor temperatures are high, when the compressor operates at the lowest frequency, surplus heat in the system still cannot be released into the indoor environment, so that the exhaust and condensation pressures are too high and even exceed the pressure operation range of the compressor, and the service life of the air conditioner compressor can be seriously influenced by the two conditions.

Accordingly, the prior art is yet to be improved and developed.

Disclosure of Invention

The present invention provides an air conditioner control method, an air conditioner and a storage medium, which aim to solve the problem that when the existing air conditioner performs low-temperature refrigeration or high-temperature heating, the discharge pressure of the compressor is too low or too high due to low or high indoor and outdoor temperatures, which seriously affects the service life of the compressor.

The technical scheme adopted by the invention for solving the technical problem is as follows:

a control method of an air conditioner comprises a compressor, a four-way valve, a plurality of first heat exchangers, a first electronic expansion valve and a second heat exchanger which are sequentially communicated through pipelines, wherein the plurality of first heat exchangers are connected in parallel, and a second electronic expansion valve is respectively arranged at a refrigerant inlet end of each first heat exchanger, and the method comprises the following steps:

acquiring an exhaust pressure value and an air outlet temperature of a compressor;

determining the target opening number of the second electronic expansion valves according to the exhaust pressure value and the outlet air temperature;

and controlling a plurality of second electronic expansion valves to operate according to the target opening number.

The method, wherein determining the target opening number of the second electronic expansion valves according to the exhaust pressure value and the outlet air temperature includes:

acquiring a set temperature, and calculating a difference value between the outlet air temperature and the set temperature;

and determining the target opening number of the second electronic expansion valves according to the exhaust pressure value and the difference value.

The method, wherein when the air conditioner is in a refrigeration state, determining the target opening number of the second electronic expansion valves according to the exhaust pressure value and the difference value comprises:

when P is present_{Exhaust of gases}When P1 or delta T is larger than E1, determining the target opening number of the second electronic expansion valves as a first target opening number; or

When P2 < P_{Exhaust of gases}When P1 is not more than P and delta T is not more than E1, determining the target opening number of the second electronic expansion valves as a second target opening number; or

When P3 < P_{Exhaust of gases}When P2 is not more than P and delta T is not more than E1, determining the target opening number of the second electronic expansion valves as a third target opening number; or

When P is present_{Exhaust of gases}P3 and DeltaT E1, determining the second electricityThe target opening number of the sub-expansion valves is a fourth target opening number; wherein, P_{Exhaust of gases}The air outlet temperature is equal to the set temperature, the delta T is the difference value between the air outlet temperature and the set temperature, P1, P2 and P3 are preset pressure thresholds, E1 is a preset temperature threshold, P1, P2, P3 and E1 are positive numbers, P1, P2 and P3 are sequentially reduced, and the first target opening number, the second target opening number, the third target opening number and the fourth target opening number are positive integers and are sequentially reduced.

The method further includes determining an opening degree of the opened second electronic expansion valve according to the exhaust pressure value and the difference, and determining the opening degree of the opened second electronic expansion valve according to the exhaust pressure value and the difference includes:

when P is present_{Exhaust of gases}When the opening degree of the second electronic expansion valve is greater than P1 or delta T is greater than E1, determining the opening degree of the opened second electronic expansion valve as the maximum opening degree of the second electronic expansion valve; or

When P is present_{Exhaust of gases}When P1 is larger than or equal to P and delta T is smaller than or equal to E1, determining the opening degree of the opened second electronic expansion valve as a first target opening degree; wherein the first target opening degree is a positive number.

The method, wherein the air conditioner further includes a third electronic expansion valve, one end of the third electronic expansion valve is connected with the compressor through the four-way valve, the other end of the third electronic expansion valve is connected with the second heat exchanger through the first electronic expansion valve, the method further includes determining an opening degree of the third electronic expansion valve according to the exhaust pressure value and the difference value, and determining the opening degree of the third electronic expansion valve according to the exhaust pressure value and the difference value, includes:

when P is present_{Exhaust of gases}Determining to close the third electronic expansion valve when P4 or DeltaT is more than E1; or

When P is present_{Exhaust of gases}When P4 is larger than or equal to P and delta T is smaller than or equal to E1, determining the opening degree of the third electronic expansion valve as a second target opening degree;

wherein P4 is a preset pressure threshold, P4 and the second target opening degree are positive numbers, and P4 < P3.

The method, wherein the method further comprises determining the first target opening degree according to the exhaust pressure value and a preset first pressure threshold value, wherein the preset first pressure threshold value is P1, P2, P3 or P4;

the determining the first target opening degree according to the exhaust pressure value and a preset first pressure threshold value comprises:

determining a first opening coefficient according to the exhaust pressure values collected for multiple times within a preset time interval and a preset first pressure threshold;

and determining the first target opening according to the first opening coefficient.

The method further comprises the step of determining the second target opening according to the exhaust pressure value and a preset second pressure threshold value, wherein the preset second pressure threshold value is P4;

the determining the second target opening degree according to the exhaust pressure value and a preset second pressure threshold value comprises:

determining a second opening coefficient according to the exhaust pressure value acquired for multiple times within the preset time interval and a preset second pressure threshold;

and determining the second target opening according to the second opening coefficient.

The method, wherein when the air conditioner is in a heating state, determining the target opening number of the second electronic expansion valves according to the exhaust pressure value and the difference value comprises:

when P is present_{Exhaust of gases}When P5 or delta T is less than or equal to E2, determining the target opening number of the second electronic expansion valves as a fifth target opening number; or

When P5 < P_{Exhaust of gases}When the number of the target openings of the second electronic expansion valves is less than or equal to P6 and the Delta T is more than E2, determining that the target opening number of the second electronic expansion valves is a sixth target opening number; or

When P6 < P_{Exhaust of gases}When the number of the target openings of the second electronic expansion valves is less than or equal to P7 and the Delta T is more than E2, determining that the target opening number of the second electronic expansion valves is a seventh target opening number; or

When P is present_{Exhaust of gases}>P7 and Δ T > E2, determining the second electron expansionThe target opening number of the expansion valves is the eighth target opening number;

wherein, P_{Exhaust of gases}The exhaust pressure is determined, Δ T is a difference value between the outlet air temperature and the set temperature, P5, P6 and P7 are preset pressure thresholds, E2 is a preset temperature threshold, P5, P6, P7 and E2 are positive numbers, P5, P6 and P7 are sequentially increased, and the number of the fifth target openings, the number of the sixth target openings, the number of the seventh target openings and the number of the eighth target openings are positive integers and sequentially decreased.

The method further includes determining an opening degree of the opened second electronic expansion valve according to the exhaust pressure value and the difference, and determining the opening degree of the opened second electronic expansion valve according to the exhaust pressure value and the difference includes:

when P is present_{Exhaust of gases}When P5 or delta T is less than or equal to E2, determining the opening degree of the opened second electronic expansion valve as the maximum opening degree of the second electronic expansion valve;

when P is present_{Exhaust of gases}When the opening degree of the second electronic expansion valve is greater than P5 and the delta T is greater than E2, determining the opening degree of the opened second electronic expansion valve as a third target opening degree; wherein the third target opening degree is a positive number.

The method, wherein the air conditioner further includes a third heat exchanger and a fourth electronic expansion valve connected by a pipeline, one end of the third heat exchanger is connected with the compressor by the four-way valve, the other end of the third heat exchanger is connected with the second heat exchanger by the fourth electronic expansion valve, the method further includes determining an opening degree of the fourth electronic expansion valve according to the exhaust pressure value and the difference value, and determining the opening degree of the fourth electronic expansion valve according to the exhaust pressure value and the difference value includes:

when P is present_{Exhaust of gases}When P8 is less than or equal to P or delta T is less than or equal to E2, determining to close the fourth electronic expansion valve;

when P is present_{Exhaust of gases}Determining the opening degree of the fourth electronic expansion valve as a fourth target opening degree when P8 is exceeded and Delta T is greater than E2;

wherein P8 is a preset pressure threshold, P8 and the fourth target opening are positive numbers, and P8 > P7.

The method, wherein the method further comprises determining the third target opening degree according to the exhaust pressure value and a preset third pressure threshold value, wherein the preset third pressure threshold value is P5, P6, P7 or P8;

the determining the third target opening degree according to the exhaust pressure value and a preset third pressure threshold value comprises:

determining a third openness coefficient according to the exhaust pressure values collected for multiple times within a preset time interval and a preset third pressure threshold;

and determining the third target opening degree according to the third opening degree coefficient.

The method further comprises the step of determining the fourth target opening according to the exhaust pressure value and a preset fourth pressure threshold, wherein the preset fourth pressure threshold is P8;

the determining the fourth target opening degree according to the exhaust pressure value and a preset fourth pressure threshold value comprises:

determining a fourth degree coefficient according to the exhaust pressure value acquired for multiple times within the preset time interval and a preset fourth pressure threshold;

and determining the fourth target opening according to the fourth opening coefficient.

An air conditioner, comprising: a processor, a storage medium communicatively coupled to the processor, the storage medium adapted to store a plurality of instructions; the processor is suitable for calling instructions in the storage medium to execute the steps of implementing the air conditioner control method.

A computer readable storage medium having stored thereon a plurality of instructions, wherein the instructions are adapted to be loaded and executed by a processor to perform the steps of implementing the air conditioning control method described above.

The invention has the beneficial effects that: the target opening number of the second electronic expansion valves is determined according to the exhaust pressure value and the air outlet temperature of the compressor, the number of the first heat exchangers participating in heat exchange of the air conditioner is controlled by controlling the target opening number of the second electronic expansion valves, the exhaust pressure of the compressor can be stabilized when the air conditioner is in a low-temperature refrigeration state, and the compressor is prevented from being started and stopped frequently; when the air conditioner is in a high-temperature heating state, the evaporation capacity of a refrigerant and the suction capacity of the compressor can be reduced, and the condition that the exhaust pressure and the condensation pressure exceed the pressure operation range of the compressor is avoided, so that the service life of the air conditioner compressor is prolonged.

Drawings

Fig. 1 is a schematic structural diagram of an air conditioner according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of an air conditioner provided in a second embodiment of the present invention;

fig. 3 is a flowchart of an embodiment of an air conditioner control method provided in an embodiment of the present invention;

fig. 4 is a functional schematic diagram of an air conditioner provided in an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any and all combinations of one or more of the associated listed items. The "plurality" referred to in the present invention means two or more.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The invention will be further explained by the description of the embodiments with reference to the drawings.

Example one

In one embodiment, an air conditioner is provided, as shown in fig. 1, the air conditioner includes a compressor 1, a four-way valve 2, a plurality of first outdoor heat exchangers 3, a first electronic expansion valve 16, and a second heat exchanger 5, which are sequentially connected through a pipeline, the plurality of first heat exchangers 3 are connected in parallel, and a second electronic expansion valve 4 is respectively disposed at a refrigerant inlet end of each of the first heat exchangers 3. One end of each of the first heat exchangers 3 is connected with the compressor 1 through the four-way valve 2, and the other end of each of the first heat exchangers 3 is connected with the second heat exchanger 5 through the first electronic expansion valve 16; a pressure sensor 6 is arranged at the position of an air outlet of the compressor 1, and the pressure sensor 6 is used for acquiring the exhaust pressure value of the compressor 1; an air outlet temperature sensor 7 is arranged at an air outlet of the second heat exchanger 5, and the air outlet temperature sensor 7 is used for collecting air outlet temperature. The air conditioner also comprises a gas collecting pipe 11, an outer machine fan 12, a flow divider 13, a filter 14, a one-way valve 15, a high-pressure valve 17, a low-pressure valve 18, an inner machine fan 19, a gas-liquid separator 20, an outdoor temperature sensor 21 and an indoor temperature sensor 22. The D end of the four-way valve 2 is connected with the compressor 1, the C end of the four-way valve 2 is connected with the gas collecting pipe 11, the S end of the four-way valve 2 is connected with the gas-liquid separator 20, the E end of the four-way valve 2 is connected with the low-pressure valve 18, one end of the low-pressure valve 18 is connected with the E end of the four-way valve 2, and the other end of the low-pressure valve 18 is connected with the second. One end of each of the first heat exchangers 3 is connected with the gas collecting pipe 11, the other end of each of the first heat exchangers is connected with the second electronic expansion valve 4, one end of each of the second electronic expansion valves 4 is connected with each of the first heat exchangers 3, the other end of each of the second electronic expansion valves 4 is connected with the shunt 13, one end of each of the filter 14 is connected with the shunt 13, the other end of each of the filter 14 is connected with the one-way valve 15 and the first electronic expansion valve 16, the one-way valve 15 is connected with the first electronic expansion valve 16 in parallel, the one-way valve 15 is connected with one end of the first electronic expansion valve 16 and the filter 14, the other end of each of the first electronic expansion valve is connected with the high-pressure. An indoor temperature sensor 22 is arranged at the air outlet of the inner fan 19, and the indoor temperature sensor 22 is used for collecting indoor temperature. An outdoor temperature sensor 21 is arranged at an air outlet of the outer fan 21, and the outdoor temperature sensor 21 is used for collecting outdoor temperature.

In the refrigeration process of the air conditioner, low-pressure steam of a refrigerant is sucked by the compressor 1 and compressed into high-temperature high-pressure steam, and then discharged to the first heat exchanger 3, outdoor unit fan 12 sucks outdoor air and flows through the first heat exchanger 3 to take away heat emitted by the refrigerant, so that the high-temperature high-pressure refrigerant steam is condensed into high-pressure liquid, the high-pressure liquid enters the second heat exchanger 5 after passing through the filter 14, the one-way valve 15 and the first electronic expansion valve 16, is evaporated and absorbs ambient heat in the second heat exchanger 5, meanwhile, indoor unit fan 19 enables the indoor air to continuously enter the second heat exchanger 5 for heat exchange, and sends the condensed air after heat release into the room, so that the indoor air continuously circulates and flows, and the refrigeration purpose is. When the outdoor temperature is low and the heat exchange effect of the first heat exchanger 3 is good, in order to ensure that the exhaust pressure of the compressor 1 is within the allowable range, the exhaust pressure of the compressor 1 is within the allowable range by reducing the refrigeration effect of the first heat exchanger 3, i.e., reducing the opening number and the opening degree of the second electronic expansion valve 4.

In a specific embodiment, the air conditioner further includes a third electronic expansion valve 8, one end of the third electronic expansion valve 8 is connected to the compressor 1 through the four-way valve 2, and the other end of the third electronic expansion valve 8 is connected to the second heat exchanger 5. When the opening number and the opening degree of the second electronic expansion valve 4 are reduced to the minimum, and the exhaust pressure of the compressor 1 still cannot be ensured within the allowable range, the third electronic expansion valve 8 is opened, so that the high-temperature and high-pressure steam discharged by the compressor 1 does not enter the first heat exchanger 3 for heat exchange, but directly enters the second heat exchanger 5 through the third electronic expansion valve 8, and the exhaust pressure of the compressor 1 is within the allowable range.

Example two

In one embodiment, an air conditioner is provided, as shown in fig. 2, the air conditioner includes a compressor 1, a four-way valve 2, a plurality of first heat exchangers 3, a first electronic expansion valve 4, and a second heat exchanger 5, which are sequentially connected through a pipeline, the plurality of first heat exchangers 3 are connected in parallel, a second electronic expansion valve 4 is respectively disposed at a refrigerant inlet end of each of the first heat exchangers 3, one end of each of the plurality of first heat exchangers 3 is connected to the compressor 1 through the four-way valve 2, and the other end of each of the plurality of first outdoor heat exchangers 3 is connected to the second heat exchanger 5 through the second electronic expansion valve 4; a pressure sensor 6 is arranged at the position of an air outlet of the compressor 1, and the pressure sensor 6 is used for acquiring the exhaust pressure value of the compressor 1; an air outlet temperature sensor 7 is arranged at an air outlet of the second heat exchanger 5, and the air outlet temperature sensor 7 is used for collecting air outlet temperature. The air conditioner also comprises a gas collecting pipe 11, an outer machine fan 12, a flow divider 13, a filter 14, a one-way valve 15, a high-pressure valve 17, a low-pressure valve 18, an inner machine fan 19, a gas-liquid separator 20, an outdoor temperature sensor 21 and an indoor temperature sensor 22. The D end of the four-way valve 2 is connected with the compressor 1, the C end of the four-way valve 2 is connected with the gas collecting pipe 11, the S end of the four-way valve 2 is connected with the gas-liquid separator 20, the E end of the four-way valve 2 is connected with the low-pressure valve 18, one end of the low-pressure valve 18 is connected with the E end of the four-way valve 2, and the other end of the low-pressure valve 18 is connected with the second. One end of each of the first heat exchangers 3 is connected with the gas collecting pipe 11, the other end of each of the first heat exchangers is connected with the second electronic expansion valve 4, one end of each of the second electronic expansion valves 4 is connected with the first heat exchanger 3, the other end of each of the second electronic expansion valves 4 is connected with the flow divider 13, one end of each of the filters 14 is connected with the flow divider 13, the other end of each of the filters 14 is connected with the one-way valve 15 and the first electronic expansion valve 16, the one-way valve 15 is connected with the first electronic expansion valve 16 in parallel, one end of each of the one-way valve 15 and the first electronic expansion valve 16 is connected with the filter 14, the other end of each of the one-way valve 15 and. An indoor temperature sensor 22 is arranged at the air outlet of the inner fan 19, and the indoor temperature sensor 22 is used for collecting indoor temperature. An outdoor temperature sensor 21 is arranged at an air outlet of the outer fan 21, and the outdoor temperature sensor 21 is used for collecting outdoor temperature.

In the heating process of the air conditioner, the compressor 1 pressurizes the refrigerant to enable the refrigerant to become high-temperature high-pressure gas, the high-temperature high-pressure gas reaches the second heat exchanger 5 through the four-way valve 2 to be condensed and liquefied to emit a large amount of heat, meanwhile, the indoor fan 19 enables indoor air to continuously enter the second heat exchanger 5 to be subjected to heat exchange, the heated air is sent into a room, liquid refrigerant enters the first heat exchanger 3 to be evaporated after passing through the one-way valve 15, the first electronic expansion valve 16, the filter 14 and the second electronic expansion valve 4, meanwhile, the outdoor fan 12 sucks outdoor air to flow through the first heat exchanger 3 to enable the refrigerant to absorb heat, and the liquid refrigerant continuously circulates and flows in the mode to achieve the. When the outdoor temperature is high, in order to ensure that the discharge pressure of the compressor 1 is within the allowable range, the refrigerant evaporation capacity of the first heat exchanger 3 is reduced by reducing the opening number and the opening degree of the second electronic expansion valve 4, so that the suction amount of the compressor 1 is reduced, and the discharge pressure of the compressor 1 is within the allowable range.

In a specific embodiment, the air conditioner further includes a third heat exchanger 9 and a fourth electronic expansion valve 10, one end of the third heat exchanger 9 is connected to the compressor 1 through the four-way valve 2, and the other end of the third heat exchanger 9 is connected to the second heat exchanger 5 through the fourth electronic expansion valve 10. When the number of the second electronic expansion valves 4 and the opening degree are reduced to the minimum and the discharge pressure of the compressor 1 is still not guaranteed to be within the allowable range, the fourth electronic expansion valve 10 is opened, and part of the refrigerant discharged from the compressor 1 is guided into the third heat exchanger 9 to release heat, so that the discharge pressure of the compressor 1 is within the allowable range.

EXAMPLE III

In an embodiment, an air conditioner control method is provided, where the air conditioner control method may be applied to an air conditioner, and a processor in the air conditioner may execute the control method to control the air conditioner, please refer to fig. 3, where fig. 3 is a flowchart of an embodiment of the air conditioner control method provided in the present invention. The method comprises the following steps:

s100, obtaining the exhaust pressure value and the air outlet temperature of the compressor.

When the air conditioner is in a low-temperature refrigeration state, the exhaust pressure and the condensation pressure are too low due to low outdoor temperature, and the outdoor machine can frequently enter a start-stop state in order to ensure that the exhaust pressure of the compressor is in an operation range; when the air conditioner is in a high-temperature heating state, the exhaust pressure and the condensation pressure are too high and even exceed the pressure operation range of the compressor due to high indoor and outdoor temperature, and the service life of the air conditioner compressor can be seriously influenced by the two conditions. In order to solve the above problem, in this embodiment, a pressure sensor is arranged at the air outlet of the air conditioner compressor in advance, and an air outlet temperature sensor is arranged at the air outlet of the second heat exchanger of the air conditioner. When the air conditioner operates, the pressure value of the exhaust port of the compressor is collected through the pressure sensor, the air outlet temperature is obtained through the air outlet temperature sensor, and therefore the target opening number of the second electronic expansion valves can be determined according to the exhaust pressure value and the air outlet temperature of the compressor in the subsequent steps. According to the embodiment, when the air conditioner is in a refrigeration mode, the second electronic expansion valve of the air conditioner is controlled according to the exhaust pressure value and the air outlet temperature of the compressor, so that the number of the second heat exchangers participating in heat exchange of the air conditioner is controlled, when the air conditioner is in a low-temperature refrigeration state, the exhaust pressure of the compressor can be stabilized, and the compressor is prevented from being started and stopped frequently; when the air conditioner is in a high-temperature heating state, the evaporation capacity of a refrigerant and the suction capacity of the compressor can be reduced, and the condition that the exhaust pressure and the condensation pressure exceed the pressure operation range of the compressor is avoided, so that the service life of the air conditioner compressor is prolonged.

In a specific embodiment, the method further comprises:

s200, determining the target opening number of the second electronic expansion valves according to the exhaust pressure value and the outlet air temperature.

During specific implementation, when the exhaust pressure value and the outlet air temperature of the compressor are different, the number of condensers/heat exchangers needing to participate in air conditioner heat exchange is changed, and the number of second heat exchangers participating in air conditioner heat exchange is determined by the opening number of the second electronic expansion valves. After the exhaust pressure value and the air outlet temperature of the compressor are obtained in the embodiment, the target opening number of the second electronic expansion valve is determined according to the exhaust pressure value and the air outlet temperature of the compressor, so that the number of the second heat exchangers participating in heat exchange of the air conditioner is controlled, frequent start and stop of the compressor or the condition that the exhaust pressure and the condensation pressure exceed the pressure operation range of the compressor is avoided, and the service life of the air conditioner compressor is prolonged.

In a specific embodiment, when the air conditioner is in the cooling mode, the step S200 specifically includes:

s210, acquiring a set temperature, and calculating a difference value between the outlet air temperature and the set temperature;

s220, determining the target opening number of the second electronic expansion valve according to the exhaust pressure value and the difference value.

Specifically, the set temperature is the current set temperature of the air conditioner, after the exhaust pressure value and the outlet air temperature of the compressor are obtained, the set temperature of the air conditioner is obtained first, then the difference value between the outlet air temperature and the set temperature is calculated, and finally the target opening number of the second electronic expansion valves is determined according to the exhaust pressure value and the difference value between the outlet air temperature and the set temperature.

In an embodiment, when the air conditioner is in a cooling state, the step S220 includes:

s221, when P_{Exhaust of gases}When P1 or delta T is larger than E1, determining the target opening number of the second electronic expansion valves as a first target opening number; or

S222, when P2 < P_{Exhaust of gases}When P1 is not more than P and delta T is not more than E1, determining the target opening number of the second electronic expansion valves as a second target opening number; or

S223, when P3 < P_{Exhaust of gases}When P2 is not more than P and delta T is not more than E1, determining the target opening number of the second electronic expansion valves as a third target opening number; or

S224, when P_{Exhaust of gases}When P3 is not more than P and delta T is not more than E1, determining the target opening number of the second electronic expansion valve as the firstThe number of the four targets to be opened.

Specifically, in the present embodiment, pressure thresholds and temperature thresholds are set in advance, the pressure thresholds may be represented by P1, P2 and P3, the temperature thresholds may be represented by E1, P1, P2, P3 and E1 are positive numbers, and P1, P2 and P3 are decreased in sequence. When the discharge pressure value P of the compressor is obtained_{Exhaust of gases}And comparing the exhaust pressure value P after the difference value delta T between the air outlet temperature and the set temperature_{Exhaust of gases}With the pressure thresholds P1, P2 and P3 and the difference DeltaT with the temperature threshold E1 when P_{Exhaust of gases}When P1 or delta T is larger than E1, determining the target opening number of the second electronic expansion valves as a first target opening number; when P2 < P_{Exhaust of gases}When P1 is not more than P and delta T is not more than E1, determining the target opening number of the second electronic expansion valves as a second target opening number; when P3 < P_{Exhaust of gases}When P2 is not more than P and delta T is not more than E1, determining the target opening number of the second electronic expansion valves as a third target opening number; when P is present_{Exhaust of gases}When P3 is not more than P and delta T is not more than E1, determining the target opening number of the second electronic expansion valves as a fourth target opening number; the first target opening number, the second target opening number, the third target opening number and the fourth target opening number are positive integers and are reduced in sequence. For example, when P1-2.2 MPa, P2-2.0 MPa, P3-1.8 MPa, E1-5 ℃ are used_{Exhaust of gases}When the pressure is higher than 2.2MPa or delta T is higher than 5 ℃, determining the target opening number of the second electronic expansion valves as the first target opening number; when 2.0MPa is less than P_{Exhaust of gases}Determining the target opening number of the second electronic expansion valves as a first target opening number when the pressure is less than or equal to 2.2MPa and the delta T is less than or equal to 5 ℃; when 1.8MPa is less than P_{Exhaust of gases}Determining the target opening number of the second electronic expansion valves as a third target opening number when the pressure is less than or equal to 2.0MPa and the delta T is less than or equal to 5 ℃; when P is present_{Exhaust of gases}And when the pressure is less than or equal to 1.8MPa and the delta T is less than or equal to 5 ℃, determining the target opening number of the second electronic expansion valves as a fourth target opening number.

In one embodiment, when the air conditioner is in the cooling mode, the method further includes determining an opening degree of the second electronic expansion valve to be opened according to the discharge pressure value and the difference, and determining the opening degree of the second electronic expansion valve to be opened according to the discharge pressure value and the difference includes:

s231, when P_{Exhaust of gases}When the opening degree of the second electronic expansion valve is greater than P1 or delta T is greater than E1, determining the opening degree of the opened second electronic expansion valve as the maximum opening degree of the second electronic expansion valve;

s232, when P_{Exhaust of gases}When P1 is larger than or equal to P and delta T is smaller than or equal to E1, determining the opening degree of the opened second electronic expansion valve as a first target opening degree; wherein the first target opening degree is a positive number.

Considering that the opening degree of the second electronic expansion valve can control the refrigeration efficiency of the first heat exchanger, in this embodiment, the target opening number of the second electronic expansion valve is determined according to the exhaust pressure value and the difference value, and meanwhile, the opening degree of the opened second electronic expansion valve is also determined according to the exhaust pressure value and the difference value. Specifically, when P is_{Exhaust of gases}When the opening degree of the second electronic expansion valve is greater than P1 or delta T is greater than E1, determining the opening degree of the opened second electronic expansion valve as the maximum opening degree of the second electronic expansion valve; when P is present_{Exhaust of gases}When P1 is larger than or equal to P and delta T is smaller than or equal to E1, determining the opening degree of the opened second electronic expansion valve as a first target opening degree; wherein the first target opening degree is a positive number. For example, when P1 is 2.2MPa and E1 is 5 ℃, when P_{Exhaust of gases}When the pressure is higher than 2.2MPa or delta T is higher than 5 ℃, determining the opening degree of the opened second electronic expansion valve as the maximum opening degree of the second electronic expansion valve; when P is present_{Exhaust of gases}And when the pressure is less than or equal to 2.2MPa and the delta T is less than or equal to 5 ℃, determining the opening degree of the opened second electronic expansion valve as a first target opening degree.

In an embodiment, the determining the opening degree of the third electronic expansion valve according to the exhaust pressure value and the difference value includes:

s241, when P_{Exhaust of gases}Determining to close the third electronic expansion valve when P4 or DeltaT is more than E1; or

S242, when P_{Exhaust of gases}And when the opening degree of the third electronic expansion valve is less than or equal to P4 and the delta T is less than or equal to E1, determining the opening degree of the third electronic expansion valve as a second target opening degree.

In the first embodiment, the air conditioner is further providedAnd a third electronic expansion valve is included, and when the discharge pressure of the compressor 1 cannot be ensured within the allowable range by controlling the opening number and the opening degree of the second electronic expansion valve, the discharge pressure of the compressor can be enabled within the allowable range by opening the third electronic expansion valve. Specifically, the opening degree of the third electronic expansion valve can be determined according to the exhaust pressure value and the difference value, when P is_{Exhaust of gases}Determining to close the third electronic expansion valve when P4 or DeltaT is more than E1; when P is present_{Exhaust of gases}When P4 is larger than or equal to P and delta T is smaller than or equal to E1, determining the opening degree of the third electronic expansion valve as a second target opening degree; wherein P4 is a preset pressure threshold, P4 and the second target opening degree are positive numbers, and P4 < P3. For example, when P4 is 1.6MPa and E1 is 5 ℃, when P is_{Exhaust of gases}When the pressure is higher than 1.6MPa or the temperature is higher than 5 ℃, the third electronic expansion valve is determined to be closed; when P is present_{Exhaust of gases}And when the pressure is less than or equal to 1.6MPa and the delta T is less than or equal to 5 ℃, determining the opening degree of the third electronic expansion valve as a second target opening degree.

In a specific embodiment, the method further comprises determining the first target opening degree according to the exhaust pressure value and a preset first pressure threshold, wherein the preset first pressure threshold is P1, P2, P3 or P4; the determining the first target opening degree according to the exhaust pressure value and a preset first pressure threshold value comprises:

s251, determining a first opening coefficient according to the exhaust pressure values collected for multiple times within a preset time interval and a preset first pressure threshold;

and S252, determining the first target opening degree according to the first opening degree coefficient.

Specifically, the pressure sensor collects the exhaust pressure value once every preset time interval, and when the judgment P is made_{Exhaust of gases}And when P1 is not more than P and delta T is not more than E1, determining a first opening coefficient according to the current exhaust pressure value, the exhaust pressure value collected last time and a preset first pressure threshold. Wherein, the calculation formula of the first opening degree is as follows: PID1 ═ K_p×([P_{Exhaust of gases}]_n-[P_{Exhaust of gases}]_n-1)+K_i×([P_{Exhaust of gases}]_n-Y1)+K_d×([P_{Exhaust of gases}]_n-2×[P_{Exhaust of gases}]_n-1+[P_{Exhaust of gases}]_n-2) Wherein [ P ]_{Exhaust of gases}]_nIs the current exhaust pressure value, [ P ]_{Exhaust of gases}]_n-1For the last collection of exhaust pressure value, [ P ]_{Exhaust of gases}]_n-2For last collection of the exhaust pressure value, Y1 is a preset first pressure threshold value, K_p、K_iAnd K_dIs a constant, which is obtained by experiments and respectively takes the values of 0.55%, 1.15% and-0.55%.

Further, the preset first pressure threshold Y1 is P1, P2, P3 or P4, and its specific value and the exhaust pressure value P_{Exhaust of gases}And the difference Δ T. When P2 < P_{Exhaust of gases}When the opening degree is not more than P1 and the delta T is not more than E1, Y1 is P1, namely the first opening degree is PID 1-K_p×([P_{Exhaust of gases}]_n-[P_{Exhaust of gases}]_n-1)+K_i×([P_{Exhaust of gases}]_n-P1)+K_d×([P_{Exhaust of gases}]_n-2×[P_{Exhaust of gases}]_n-1+[P_{Exhaust of gases}]_n-2) (ii) a When P3 < P_{Exhaust of gases}When the opening degree is not more than P2 and the delta T is not more than E1, Y1 is P2, namely the first opening degree is PID 1-K_p×([P_{Exhaust of gases}]_n-[P_{Exhaust of gases}]_n-1)+K_i×([P_{Exhaust of gases}]_n-P2)+K_d×([P_{Exhaust of gases}]_n-2×[P_{Exhaust of gases}]_n-1+[P_{Exhaust of gases}]_n-2) (ii) a When P4 < P_{Exhaust of gases}When the opening degree is not more than P3 and the delta T is not more than E1, Y1 is P3, namely the first opening degree is PID 1-K_p×([P_{Exhaust of gases}]_n-[P_{Exhaust of gases}]_n-1)+K_i×([P_{Exhaust of gases}]_n-P3)+K_d×([P_{Exhaust of gases}]_n-2×[P_{Exhaust of gases}]_n-1+[P_{Exhaust of gases}]_n-2) (ii) a When P is present_{Exhaust of gases}When the opening degree is not more than P4 and the delta T is not more than E1, Y1 is P4, namely the first opening degree is PID 1-K_p×([P_{Exhaust of gases}]_n-[P_{Exhaust of gases}]_n-1)+K_i×([P_{Exhaust of gases}]_n-P4)+K_d×([P_{Exhaust of gases}]_n-2×[P_{Exhaust of gases}]_n-1+[P_{Exhaust of gases}]_n-2)。

When according to the preset time intervalAfter the exhaust pressure values collected for multiple times and the preset first threshold value determine the first opening coefficient, the first target opening can be determined according to the first opening coefficient. When the first target opening degree is determined, the current opening degree of the second electronic expansion valve is required to be acquired, and then the first target opening degree is determined according to the current opening degree of the second electronic expansion valve and the first opening degree coefficient. The calculation formula of the first target opening degree is X₁＝X_{Current 1}+X_{Current 1}PID1, wherein X₁Is a first target opening degree, X_{Current 1}PID1 is a first opening coefficient for the current opening of the second electronic expansion valve.

In a specific embodiment, the method further comprises: determining the second target opening degree according to the exhaust pressure value and a preset second pressure threshold value, wherein the preset second pressure threshold value is P4; the determining the second target opening degree according to the exhaust pressure value and a preset second pressure threshold value comprises:

s261, determining a second opening coefficient according to the exhaust pressure values collected for multiple times within the preset time interval and a preset second pressure threshold;

and S262, determining the second target opening degree according to the second opening degree coefficient.

Similar to the aforementioned method for determining the first target opening degree, when determining the second target opening degree, first, a second opening degree coefficient is determined according to the exhaust pressure values collected for multiple times within a preset time interval and a preset second pressure threshold. Wherein, the calculation formula of the second opening degree is as follows: PID2 ═ K_p×([P_{Exhaust of gases}]_n-[P_{Exhaust of gases}]_n-1)+K_i×([P_{Exhaust of gases}]_n-Y2)+K_d×([P_{Exhaust of gases}]_n-2×[P_{Exhaust of gases}]_n-1+[P_{Exhaust of gases}]_n-2) Wherein [ P ]_{Exhaust of gases}]_nIs the current exhaust pressure value, [ P ]_{Exhaust of gases}]_n-1For the last collection of exhaust pressure value, [ P ]_{Exhaust of gases}]_n-2For last collection of the exhaust pressure value, Y2 is a preset second pressure threshold value P4, K_p、K_iAnd K_dIs a constant, which is obtained by experiments and takes the value of0.55%, 1.15% and-0.55%.

After the second opening coefficient is determined, a second target opening can be determined according to the second opening coefficient. When the second target opening degree is determined, the current opening degree of the third electronic expansion valve is required to be acquired, and then the second target opening degree is determined according to the current opening degree of the third electronic expansion valve and the second opening degree coefficient. The calculation formula of the second target opening degree is X₂＝X_{Current 2}+X_{Current 2}PID2, wherein X₂Is a second target opening degree, X_{Current 2}PID2 is the second opening coefficient for the current opening of the third electronic expansion valve.

In an embodiment, when the air conditioner is in a heating state, the step S220 includes:

s221', when P_{Exhaust of gases}When P5 or delta T is less than or equal to E2, determining the target opening number of the second electronic expansion valves as a fifth target opening number; or

S222', when P5 < P_{Exhaust of gases}When the number of the target openings of the second electronic expansion valves is less than or equal to P6 and the Delta T is more than E2, determining that the target opening number of the second electronic expansion valves is a sixth target opening number; or

S223', when P6 < P_{Exhaust of gases}When the number of the target openings of the second electronic expansion valves is less than or equal to P7 and the Delta T is more than E2, determining that the target opening number of the second electronic expansion valves is a seventh target opening number; or

S224' when P_{Exhaust of gases}>And when P7 and DeltaT are larger than E2, determining the target opening number of the second electronic expansion valve as an eighth target opening number.

Specifically, in the present embodiment, pressure thresholds and temperature thresholds are set in advance, the pressure thresholds may be represented by P5, P6 and P7, the temperature thresholds may be represented by E2, P5, P6, P7 and E2 are positive numbers, and P5, P6 and P7 are sequentially increased. When the discharge pressure value P of the compressor is obtained_{Exhaust of gases}And comparing the exhaust pressure value P after the difference value delta T between the air outlet temperature and the set temperature_{Exhaust of gases}With the pressure thresholds P5, P6 and P7 and the difference DeltaT with the temperature threshold E2 when P_{Exhaust of gases}When P5 or delta T is less than or equal to E2, determining the target opening number of the second electronic expansion valves as a fifth target opening number; when P5 < P_{Exhaust of gases}P6 and DeltaTWhen the target opening number of the second electronic expansion valve is larger than E2, determining that the target opening number of the second electronic expansion valve is a sixth target opening number; when P6 < P_{Exhaust of gases}When the number of the target openings of the second electronic expansion valves is less than or equal to P7 and the Delta T is more than E2, determining that the target opening number of the second electronic expansion valves is a seventh target opening number; when P7 < P_{Exhaust of gases}When the delta T is larger than E2, determining the target opening number of the second electronic expansion valves as an eighth target opening number; the number of the fifth target opening, the number of the sixth target opening, the number of the seventh target opening and the number of the eighth target opening are positive integers and are sequentially reduced. For example, when P5 ═ 1.8MPa, P6 ═ 2.0MPa, P7 ═ 2.2MPa, and E2 ═ 5 ℃ when P is present_{Exhaust of gases}When the pressure is less than or equal to 1.8MPa or the delta T is less than or equal to 5 ℃, determining the target opening number of the second electronic expansion valves as a fifth target opening number; when 1.8MPa is less than P_{Exhaust of gases}When the pressure is less than or equal to 2.0MPa and the delta T is more than 5 ℃, determining the target opening number of the second electronic expansion valves as a sixth target opening number; when 2.0MPa is less than P_{Exhaust of gases}When the pressure is less than or equal to 2.2MPa and the delta T is more than 5 ℃, determining the target opening number of the second electronic expansion valves as a seventh target opening number; when P is present_{Exhaust of gases}>And when the pressure is 2.2MPa and the delta T is more than 5 ℃, determining that the target opening number of the second electronic expansion valves is the eighth target opening number.

In one embodiment, when the air conditioner is in the heating mode, the method further includes determining an opening degree of the second electronic expansion valve that is opened according to the exhaust pressure value and the difference, and determining the opening degree of the second electronic expansion valve that is opened according to the exhaust pressure value and the difference includes:

s231' when P_{Exhaust of gases}When P5 or delta T is less than or equal to E2, determining the opening degree of the opened second electronic expansion valve as the maximum opening degree of the second electronic expansion valve;

s232' when P_{Exhaust of gases}When the opening degree of the second electronic expansion valve is greater than P5 and the delta T is greater than E2, determining the opening degree of the opened second electronic expansion valve as a third target opening degree; wherein the third target opening degree is a positive number.

Considering that the opening degree of the second electronic expansion valve can control the heating efficiency of the first heat exchanger, the second electronic expansion valve is determined according to the exhaust pressure value and the difference value in the embodimentAnd determining the opening degree of the opened second electronic expansion valve according to the exhaust pressure value and the difference value while the target opening number of the two electronic expansion valves is up. Specifically, when P is_{Exhaust of gases}When P5 or delta T is less than or equal to E2, determining the opening degree of the opened second electronic expansion valve as the maximum opening degree of the second electronic expansion valve; when P is present_{Exhaust of gases}When the opening degree of the second electronic expansion valve is greater than P5 and the delta T is greater than E2, determining the opening degree of the opened second electronic expansion valve as a third target opening degree; wherein the third target opening degree is a positive number; wherein the third target opening degree is a positive number. For example, when P5 is 1.8MPa and E2 is 5 ℃, when P_{Exhaust of gases}When the pressure is less than or equal to 1.8MPa or the delta T is less than or equal to 5 ℃, determining the opening degree of the opened second electronic expansion valve as the maximum opening degree of the second electronic expansion valve; when P is present_{Exhaust of gases}When the pressure is higher than 1.8MPa and the delta T is higher than 5 ℃, determining the opening degree of the opened second electronic expansion valve as a third target opening degree; wherein the third target opening degree is a positive number.

In an embodiment, the determining the opening degree of the fourth electronic expansion valve according to the exhaust pressure value and the difference value includes:

s241' when P_{Exhaust of gases}When P8 is less than or equal to P or delta T is less than or equal to E2, determining to close the fourth electronic expansion valve; or

S242' when P_{Exhaust of gases}And determining the opening degree of the fourth electronic expansion valve as a fourth target opening degree when the opening degree is greater than P8 and the Delta T is greater than E2.

In the second embodiment, it is mentioned that the air conditioner further includes a third heat exchanger and a fourth electronic expansion valve, and when the discharge pressure of the compressor cannot be guaranteed to be within the allowable range by controlling the opening number and the opening degree of the second electronic expansion valve, the discharge pressure of the compressor can be made to be within the allowable range by opening the fourth electronic expansion valve. Specifically, the opening degree of the fourth electronic expansion valve can be determined according to the exhaust pressure value and the difference value, when P is_{Exhaust of gases}When P8 is less than or equal to P or delta T is less than or equal to E2, determining to close the fourth electronic expansion valve; when P is present_{Exhaust of gases}Determining the opening degree of the fourth electronic expansion valve as a fourth target opening degree when P8 is exceeded and Delta T is greater than E2;wherein P8 is a preset pressure threshold, P8 and the fourth target opening are positive numbers, and P8 > P7. For example, when P8 is 2.4MPa and E2 is 5 ℃, when P_{Exhaust of gases}When the pressure is less than or equal to 2.4MPa or the delta T is less than or equal to 5 ℃, determining to close the fourth electronic expansion valve; when P is present_{Exhaust of gases}And when the pressure is higher than 2.4MPa and the delta T is higher than 5 ℃, determining the opening degree of the fourth electronic expansion valve as a fourth target opening degree.

In a specific embodiment, the method further comprises determining the third target opening degree according to the exhaust pressure value and a preset third pressure threshold, wherein the preset third pressure threshold is P5, P6, P7 or P8; the determining the third target opening degree according to the exhaust pressure value and a preset third pressure threshold value comprises:

s251', determining a third openness coefficient according to the exhaust pressure values collected for multiple times within the preset time interval and a preset third pressure threshold;

and S252', determining the third target opening degree according to the third opening degree coefficient.

Specifically, the pressure sensor collects the exhaust pressure value once every preset time interval, and when the judgment P is made_{Exhaust of gases}And when the pressure value is more than P5 and the delta T is more than E2, determining a third opening degree coefficient according to the current exhaust pressure value, the last collected exhaust pressure value and a preset third pressure threshold value. Wherein, the calculation formula of the third opening degree is as follows: PID3 ═ K_p×([P_{Exhaust of gases}]_n-[P_{Exhaust of gases}]_n-1)+K_i×([P_{Exhaust of gases}]_n-Y3)+K_d×([P_{Exhaust of gases}]_n-2×[P_{Exhaust of gases}]_n-1+[P_{Exhaust of gases}]_n-2) Wherein [ P ]_{Exhaust of gases}]_nIs the current exhaust pressure value, [ P ]_{Exhaust of gases}]_n-1For the last collection of exhaust pressure value, [ P ]_{Exhaust of gases}]_n-2For last collection of the exhaust pressure value, Y3 is a preset third pressure threshold value, K_p、K_iAnd K_dIs a constant, which is obtained by experiments and respectively takes the values of 0.55%, 1.15% and-0.55%.

Further, the preset third pressure threshold Y3 is P5, P6, P7 or P8, which are specificValue and exhaust pressure value P_{Exhaust of gases}And the difference Δ T. When P5 < P_{Exhaust of gases}P6 is not more than P, and when delta T is more than E2, Y3 is P5, namely the third opening is PID 3-K_p×([P_{Exhaust of gases}]_n-[P_{Exhaust of gases}]_n-1)+K_i×([P_{Exhaust of gases}]_n-P5)+K_d×([P_{Exhaust of gases}]_n-2×[P_{Exhaust of gases}]_n-1+[P_{Exhaust of gases}]_n-2) (ii) a When P6 < P_{Exhaust of gases}P7 is not more than P, and when delta T is more than E2, Y3 is P6, namely the third opening is PID 3-K_p×([P_{Exhaust of gases}]_n-[P_{Exhaust of gases}]_n-1)+K_i×([P_{Exhaust of gases}]_n-P6)+K_d×([P_{Exhaust of gases}]_n-2×[P_{Exhaust of gases}]_n-1+[P_{Exhaust of gases}]_n-2) (ii) a When P7 < P_{Exhaust of gases}P8 is not more than P, and when delta T is more than E2, Y3 is P7, namely the third opening is PID 3-K_p×([P_{Exhaust of gases}]_n-[P_{Exhaust of gases}]_n-1)+K_i×([P_{Exhaust of gases}]_n-P7)+K_d×([P_{Exhaust of gases}]_n-2×[P_{Exhaust of gases}]_n-1+[P_{Exhaust of gases}]_n-2) (ii) a When in use

P_{Exhaust of gases}>P8 and Δ T > E2, Y3 is P8, i.e., the third opening degree is PID3 ═ K_p×([P_{Exhaust of gases}]_n-[P_{Exhaust of gases}]_n-1)+K_i×([P_{Exhaust of gases}]_n-P8)+K_d×([P_{Exhaust of gases}]_n-2×[P_{Exhaust of gases}]_n-1+[P_{Exhaust of gases}]_n-2)。

And when the third opening coefficient is determined according to the exhaust pressure values collected for multiple times in the preset time interval and the preset third threshold, determining a third target opening according to the third opening coefficient. When the third target opening degree is determined, the current opening degree of the second electronic expansion valve is required to be acquired, and then the third target opening degree is determined according to the current opening degree of the second electronic expansion valve and a third opening degree coefficient. The calculation formula of the third target opening degree is X₃＝X_{Current 3}+X_{Current 3}PID3, wherein X₃Is a third target opening degree, X_{Current 3}Is a secondThe current opening degree of the electronic expansion valve, PID3, is a third opening degree coefficient.

In a specific embodiment, the method further comprises: determining the fourth target opening degree according to the exhaust pressure value and a preset fourth pressure threshold value, wherein the preset fourth pressure threshold value is P8; the determining the fourth target opening degree according to the exhaust pressure value and a preset fourth pressure threshold value comprises:

s261' determining a fourth degree coefficient according to the exhaust pressure values collected for multiple times within the preset time interval and a preset fourth pressure threshold;

and S262', determining the fourth target opening according to the fourth opening coefficient.

Similar to the determination method of the third target opening degree, when the fourth target opening degree is determined, the fourth opening degree coefficient is determined according to the exhaust pressure values collected for multiple times within the preset time interval and the preset fourth pressure threshold value. Wherein, the calculation formula of the fourth opening degree is as follows: PID4 ═ K_p×([P_{Exhaust of gases}]_n-[P_{Exhaust of gases}]_n-1)+K_i×([P_{Exhaust of gases}]_n-Y4)+K_d×([P_{Exhaust of gases}]_n-2×[P_{Exhaust of gases}]_n-1+[P_{Exhaust of gases}]_n-2) Wherein [ P ]_{Exhaust of gases}]_nIs the current exhaust pressure value, [ P ]_{Exhaust of gases}]_n-1For the last collection of exhaust pressure value, [ P ]_{Exhaust of gases}]_n-2For last collection of the exhaust pressure value, Y4 is a preset fourth pressure threshold value, and the value is P8, K_p、K_iAnd K_dIs a constant, which is obtained by experiments and respectively takes the values of 0.55%, 1.15% and-0.55%.

After the fourth degree coefficient is determined, the fourth target opening degree can be determined according to the fourth degree coefficient. When the fourth target opening degree is determined, the current opening degree of the fourth electronic expansion valve is required to be acquired, and then the fourth target opening degree is determined according to the current opening degree of the fourth electronic expansion valve and a fourth opening degree coefficient. The calculation formula of the fourth target opening degree is X₄＝X_{Current 4}+X_{Current 4}PID4, wherein X₄Is a fourth target opening degree, X_{Current 4}PID4 is a fourth opening coefficient, which is the current opening of the fourth electronic expansion valve.

In a specific embodiment, the method further comprises:

and S300, controlling the plurality of second electronic expansion valves to operate according to the target opening number.

When the air conditioner is in a refrigeration mode, the plurality of first heat exchangers are respectively connected with the plurality of second electronic expansion valves in series, and the second electronic expansion valves are controlled according to the target opening number determined by the exhaust pressure value and the outlet air temperature. When P is present_{Exhaust of gases}When P1 or delta T is more than E1, controlling the second electronic expansion valves to operate according to the first target opening number; when P2 < P_{Exhaust of gases}When P1 is less than or equal to and delta T is less than or equal to E1, controlling the second electronic expansion valve to operate according to the second target opening number; when P3 < P_{Exhaust of gases}When P2 is less than or equal to and delta T is less than or equal to E1, controlling the second electronic expansion valves to operate according to the third target opening number; when P is present_{Exhaust of gases}And when the number of the delta T is less than or equal to P3 and less than or equal to E1, controlling the second electronic expansion valves to operate according to a fourth target opening number.

And when the air conditioner is in a heating mode, controlling the second electronic expansion valve according to the target opening number determined by the exhaust pressure value and the outlet air temperature. When P is present_{Exhaust of gases}When P5 or delta T is less than or equal to E2, controlling the second electronic expansion valves to operate according to the fifth target opening number; when P5 < P_{Exhaust of gases}When P6 is less than or equal to and delta T is more than E2, controlling the second electronic expansion valves to operate according to the sixth target opening number; when P6 < P_{Exhaust of gases}When the number of the electronic expansion valves is less than or equal to P7 and the delta T is more than E2, controlling the second electronic expansion valves to operate according to a seventh target opening number; when P is present_{Exhaust of gases}>And when the pressure is P7 and the delta T is more than E2, controlling the second electronic expansion valve to operate according to the eighth target opening number.

Example four

Based on the above embodiments, the present invention further provides an air conditioner, and a schematic block diagram thereof may be as shown in fig. 4. The air conditioner includes a processor, a memory, a network interface, and a user interface connected by a system bus. Wherein, the processor of the air conditioner is used for providing calculation and control capability. The memory of the air conditioner comprises a nonvolatile storage medium and an internal memory. The nonvolatile storage medium stores an operating system and an air conditioning control program. The internal memory provides an environment for the operation of the operating system and the air conditioning control program in the nonvolatile storage medium. The network interface of the air conditioner is used for connecting and communicating with an external terminal through a network. The user interface of the air conditioner is used for being connected with the client side and carrying out data communication with the client side. The air conditioning control program is executed by a processor to implement an air conditioning control method. The display screen of the air conditioner is a display interface of the air conditioner and is used for displaying the working mode and the working temperature of the air conditioner.

It will be understood by those skilled in the art that the block diagram of fig. 4 is only a block diagram of a portion of the structure associated with the solution of the present invention, and does not constitute a limitation of the air conditioner to which the solution of the present invention is applied, and a specific air conditioner may include more or less components than those shown in the drawings, or may combine some components, or have a different arrangement of components.

In one embodiment, an air conditioner is provided, which includes a memory and a processor, wherein the memory stores an air conditioner control program, and the processor executes the air conditioner control program to realize at least the following steps:

acquiring an exhaust pressure value and an air outlet temperature of a compressor;

determining the target opening number of the second electronic expansion valves according to the exhaust pressure value and the outlet air temperature;

and controlling a plurality of second electronic expansion valves to operate according to the target opening number.

In one embodiment, the processor, when executing the air conditioner control program, may further implement: acquiring a set temperature, and calculating a difference value between the outlet air temperature and the set temperature; and determining the target opening number of the second electronic expansion valves according to the exhaust pressure value and the difference value.

In one embodiment, the processor, when executing the air conditioner control program, may further implement: when P is present_{Exhaust of gases}When P1 or delta T is larger than E1, determining the target opening number of the second electronic expansion valves as a first target opening number; or when P2＜P_{Exhaust of gases}When P1 is not more than P and delta T is not more than E1, determining the target opening number of the second electronic expansion valves as a second target opening number; or when P3 < P_{Exhaust of gases}When P2 is not more than P and delta T is not more than E1, determining the target opening number of the second electronic expansion valves as a third target opening number; or when P is_{Exhaust of gases}When P3 is not more than P and delta T is not more than E1, determining the target opening number of the second electronic expansion valves as a fourth target opening number; wherein, P_{Exhaust of gases}The air outlet temperature is equal to the set temperature, the delta T is the difference value between the air outlet temperature and the set temperature, P1, P2 and P3 are preset pressure thresholds, E1 is a preset temperature threshold, P1, P2, P3 and E1 are positive numbers, P1, P2 and P3 are sequentially reduced, and the first target opening number, the second target opening number, the third target opening number and the fourth target opening number are positive integers and are sequentially reduced.

In one embodiment, the processor, when executing the air conditioner control program, may further implement: when P is present_{Exhaust of gases}When the opening degree of the second electronic expansion valve is greater than P1 or delta T is greater than E1, determining the opening degree of the opened second electronic expansion valve as the maximum opening degree of the second electronic expansion valve; or when P is_{Exhaust of gases}When P1 is larger than or equal to P and delta T is smaller than or equal to E1, determining the opening degree of the opened second electronic expansion valve as a first target opening degree; wherein the first target opening degree is a positive number.

In one embodiment, the processor, when executing the air conditioner control program, may further implement: when P is present_{Exhaust of gases}Determining to close the third electronic expansion valve when P4 or DeltaT is more than E1; or when P is_{Exhaust of gases}When P4 is larger than or equal to P and delta T is smaller than or equal to E1, determining the opening degree of the third electronic expansion valve as a second target opening degree; wherein P4 is a preset pressure threshold, P4 and the second target opening degree are positive numbers, and P4 < P3.

In one embodiment, the processor, when executing the air conditioner control program, may further implement: determining a first opening coefficient according to the exhaust pressure values collected for multiple times within a preset time interval and a preset first pressure threshold; and determining the first target opening according to the first opening coefficient.

In one embodiment, the processor, when executing the air conditioner control program, may further implement: determining a second opening coefficient according to the exhaust pressure value acquired for multiple times within the preset time interval and a preset second pressure threshold; and determining the second target opening according to the second opening coefficient.

In one embodiment, the processor, when executing the air conditioner control program, may further implement: when P is present_{Exhaust of gases}When P5 or delta T is less than or equal to E2, determining the target opening number of the second electronic expansion valves as a fifth target opening number; or when P5 < P_{Exhaust of gases}When the number of the target openings of the second electronic expansion valves is less than or equal to P6 and the Delta T is more than E2, determining that the target opening number of the second electronic expansion valves is a sixth target opening number; or when P6 < P_{Exhaust of gases}When the number of the target openings of the second electronic expansion valves is less than or equal to P7 and the Delta T is more than E2, determining that the target opening number of the second electronic expansion valves is a seventh target opening number; or when P is_{Exhaust of gases}>When P7 and delta T are larger than E2, determining the target opening number of the second electronic expansion valves as an eighth target opening number; wherein, P_{Exhaust of gases}For the exhaust pressure, Δ T is a difference between the outlet air temperature and the set temperature, P5, P6, P7 and E2 are positive numbers, and P5, P6 and P7 are sequentially increased, and the fifth target opening number, the sixth target opening number, the seventh target opening number and the eighth target opening number are positive integers and are sequentially decreased.

In one embodiment, the processor, when executing the air conditioner control program, may further implement: when P is present_{Exhaust of gases}When P5 or delta T is less than or equal to E2, determining the opening degree of the opened second electronic expansion valve as the maximum opening degree of the second electronic expansion valve; when P is present_{Exhaust of gases}When the opening degree of the second electronic expansion valve is greater than P5 and the delta T is greater than E2, determining the opening degree of the opened second electronic expansion valve as a third target opening degree; wherein the third target opening degree is a positive number.

In one embodiment, the processor, when executing the air conditioner control program, may further implement: when P is present_{Exhaust of gases}When P8 is less than or equal to P or delta T is less than or equal to E2, determining to close the fourth electronic expansion valve; when P is present_{Exhaust of gases}Determining the opening degree of the fourth electronic expansion valve as a fourth target opening degree when P8 is exceeded and Delta T is greater than E2; wherein P8 is a preset pressure threshold, P8 and the fourth target opening are positive numbers, and P8 > P7.

In one embodiment, the processor, when executing the air conditioner control program, may further implement: determining a third openness coefficient according to the exhaust pressure values collected for multiple times within a preset time interval and a preset third pressure threshold; and determining the third target opening degree according to the third opening degree coefficient.

In one embodiment, the processor, when executing the air conditioner control program, may further implement: determining a fourth degree coefficient according to the exhaust pressure value acquired for multiple times within the preset time interval and a preset fourth pressure threshold; and determining the fourth target opening according to the fourth opening coefficient.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by an air conditioning control program, which may be stored in a non-volatile computer readable storage medium, and when executed, the air conditioning control program may include the processes of the embodiments of the methods described above. Any reference to memory, storage, databases, or other media used in embodiments provided herein may include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

In summary, the present invention discloses an air conditioner control method, an air conditioner and a storage medium, wherein the method includes: collecting the exhaust pressure value and the air outlet temperature of the compressor; determining the target opening number of the second electronic expansion valves according to the exhaust pressure value and the outlet air temperature; and controlling a plurality of second electronic expansion valves to operate according to the target opening number. According to the invention, the opening number of the second electronic expansion valves is controlled according to the exhaust pressure value and the air outlet temperature of the compressor, so that the number of the first heat exchangers participating in heat exchange of the air conditioner is controlled, when the air conditioner is in a low-temperature refrigeration state, the exhaust pressure of the compressor can be stabilized, and frequent starting and stopping of the compressor are avoided; when the air conditioner is in a high-temperature heating state, the evaporation capacity of a refrigerant and the suction capacity of the compressor can be reduced, and the condition that the exhaust pressure and the condensation pressure exceed the pressure operation range of the compressor is avoided, so that the service life of the air conditioner compressor is prolonged.

It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.

Claims (14)

1. The air conditioner control method is characterized in that the air conditioner comprises a compressor, a four-way valve, a plurality of first heat exchangers, a first electronic expansion valve and a second heat exchanger which are sequentially communicated through pipelines, the plurality of first heat exchangers are connected in parallel, and a second electronic expansion valve is respectively arranged at a refrigerant inlet end of each first heat exchanger, and the method comprises the following steps:

acquiring an exhaust pressure value and an air outlet temperature of a compressor;

determining the target opening number of the second electronic expansion valves according to the exhaust pressure value and the outlet air temperature;

and controlling a plurality of second electronic expansion valves to operate according to the target opening number.

2. The method of claim 1, wherein the determining the target number of the second electronic expansion valves to be opened according to the exhaust pressure value and the outlet air temperature comprises:

acquiring a set temperature, and calculating a difference value between the outlet air temperature and the set temperature;

and determining the target opening number of the second electronic expansion valves according to the exhaust pressure value and the difference value.

3. The method of claim 2, wherein the determining the target number of the second electronic expansion valves to be opened according to the discharge pressure value and the difference value when the air conditioner is in a cooling state comprises:

when P is present_{Exhaust of gases}When P1 or delta T is larger than E1, determining the target opening number of the second electronic expansion valves as a first target opening number; or

When P2 < P_{Exhaust of gases}When P1 is not more than P and delta T is not more than E1, determining the target opening number of the second electronic expansion valves as a second target opening number; or

When P3 < P_{Exhaust of gases}When P2 is not more than P and delta T is not more than E1, determining the target opening number of the second electronic expansion valves as a third target opening number; or

When P is present_{Exhaust of gases}When P3 is not more than P and delta T is not more than E1, determining the target opening number of the second electronic expansion valves as a fourth target opening number; wherein, P_{Exhaust of gases}The air outlet temperature is equal to the set temperature, the delta T is the difference value between the air outlet temperature and the set temperature, P1, P2 and P3 are preset pressure thresholds, E1 is a preset temperature threshold, P1, P2, P3 and E1 are positive numbers, P1, P2 and P3 are sequentially reduced, and the first target opening number, the second target opening number, the third target opening number and the fourth target opening number are positive integers and are sequentially reduced.

4. The method of claim 3, further comprising determining an opening degree of the second electronic expansion valve to open based on the discharge pressure value and the difference, the determining an opening degree of the second electronic expansion valve to open based on the discharge pressure value and the difference comprising:

when P is present_{Exhaust of gases}When the opening degree of the second electronic expansion valve is greater than P1 or delta T is greater than E1, determining the opening degree of the opened second electronic expansion valve as the maximum opening degree of the second electronic expansion valve; or

When P is present_{Exhaust of gases}When P1 is larger than or equal to P and delta T is smaller than or equal to E1, determining the opening degree of the opened second electronic expansion valve as a first target opening degree;wherein the first target opening degree is a positive number.

5. The method of claim 3, wherein the air conditioner further comprises a third electronic expansion valve, one end of the third electronic expansion valve is connected with the compressor through the four-way valve, the other end of the third electronic expansion valve is connected with the second heat exchanger through the first electronic expansion valve, the method further comprises determining an opening degree of the third electronic expansion valve according to the exhaust pressure value and the difference value, and determining the opening degree of the third electronic expansion valve according to the exhaust pressure value and the difference value comprises:

when P is present_{Exhaust of gases}Determining to close the third electronic expansion valve when P4 or DeltaT is more than E1; or

When P is present_{Exhaust of gases}When P4 is larger than or equal to P and delta T is smaller than or equal to E1, determining the opening degree of the third electronic expansion valve as a second target opening degree;

wherein P4 is a preset pressure threshold, P4 and the second target opening degree are positive numbers, and P4 < P3.

6. The method of claim 4, further comprising determining the first target opening degree from the exhaust pressure value and a preset first pressure threshold, wherein the preset first pressure threshold is P1, P2, P3 or P4;

the determining the first target opening degree according to the exhaust pressure value and a preset first pressure threshold value comprises:

determining a first opening coefficient according to the exhaust pressure values collected for multiple times within a preset time interval and a preset first pressure threshold;

and determining the first target opening according to the first opening coefficient.

7. The method according to claim 5, further comprising determining the second target opening degree according to the exhaust pressure value and a preset second pressure threshold value, wherein the preset second pressure threshold value is P4;

the determining the second target opening degree according to the exhaust pressure value and a preset second pressure threshold value comprises:

determining a second opening coefficient according to the exhaust pressure value acquired for multiple times within the preset time interval and a preset second pressure threshold;

and determining the second target opening according to the second opening coefficient.

8. The method of claim 2, wherein the determining the target number of the second electronic expansion valves to be opened according to the exhaust pressure value and the difference value when the air conditioner is in a heating state comprises:

when P is present_{Exhaust of gases}When P5 or delta T is less than or equal to E2, determining the target opening number of the second electronic expansion valves as a fifth target opening number; or

When P5 < P_{Exhaust of gases}When the number of the target openings of the second electronic expansion valves is less than or equal to P6 and the Delta T is more than E2, determining that the target opening number of the second electronic expansion valves is a sixth target opening number; or

When P6 < P_{Exhaust of gases}When the number of the target openings of the second electronic expansion valves is less than or equal to P7 and the Delta T is more than E2, determining that the target opening number of the second electronic expansion valves is a seventh target opening number; or

When P is present_{Exhaust of gases}>When P7 and delta T are larger than E2, determining the target opening number of the second electronic expansion valves as an eighth target opening number;

wherein, P_{Exhaust of gases}The exhaust pressure is determined, Δ T is a difference value between the outlet air temperature and the set temperature, P5, P6 and P7 are preset pressure thresholds, E2 is a preset temperature threshold, P5, P6, P7 and E2 are positive numbers, P5, P6 and P7 are sequentially increased, and the number of the fifth target openings, the number of the sixth target openings, the number of the seventh target openings and the number of the eighth target openings are positive integers and sequentially decreased.

9. The method of claim 8, further comprising determining an opening degree of the second electronic expansion valve to open based on the discharge pressure value and the difference, the determining an opening degree of the second electronic expansion valve to open based on the discharge pressure value and the difference comprising:

when P is present_{Exhaust of gases}When P5 or delta T is less than or equal to E2, determining the opening degree of the opened second electronic expansion valve as the maximum opening degree of the second electronic expansion valve;

when P is present_{Exhaust of gases}When the opening degree of the second electronic expansion valve is greater than P5 and the delta T is greater than E2, determining the opening degree of the opened second electronic expansion valve as a third target opening degree; wherein the third target opening degree is a positive number.

10. The method of claim 8, wherein the air conditioner further comprises a third heat exchanger and a fourth electronic expansion valve connected by a pipe, wherein one end of the third heat exchanger is connected to the compressor by the four-way valve, and the other end of the third heat exchanger is connected to the second heat exchanger by the fourth electronic expansion valve, wherein the method further comprises determining an opening degree of the fourth electronic expansion valve according to the discharge pressure value and the difference value, and wherein determining the opening degree of the fourth electronic expansion valve according to the discharge pressure value and the difference value comprises:

when P is present_{Exhaust of gases}When P8 is less than or equal to P or delta T is less than or equal to E2, determining to close the fourth electronic expansion valve;

when P is present_{Exhaust of gases}Determining the opening degree of the fourth electronic expansion valve as a fourth target opening degree when P8 is exceeded and Delta T is greater than E2;

wherein P8 is a preset pressure threshold, P8 and the fourth target opening are positive numbers, and P8 > P7.

11. The method of claim 9, further comprising determining the third target opening degree according to the exhaust pressure value and a preset third pressure threshold, wherein the preset third pressure threshold is P5, P6, P7 or P8;

the determining the third target opening degree according to the exhaust pressure value and a preset third pressure threshold value comprises:

determining a third openness coefficient according to the exhaust pressure values collected for multiple times within a preset time interval and a preset third pressure threshold;

and determining the third target opening degree according to the third opening degree coefficient.

12. The method according to claim 10, further comprising determining the fourth target opening degree according to the exhaust pressure value and a preset fourth pressure threshold value, wherein the preset fourth pressure threshold value is P8;

the determining the fourth target opening degree according to the exhaust pressure value and a preset fourth pressure threshold value comprises:

determining a fourth degree coefficient according to the exhaust pressure value acquired for multiple times within the preset time interval and a preset fourth pressure threshold;

and determining the fourth target opening according to the fourth opening coefficient.

13. An air conditioner, comprising: a processor, a storage medium communicatively coupled to the processor, the storage medium adapted to store a plurality of instructions; the processor is adapted to call instructions in the storage medium to perform the steps of implementing the air conditioning control method of any of the preceding claims 1-12.

14. A computer readable storage medium having stored thereon a plurality of instructions adapted to be loaded and executed by a processor to perform the steps of implementing the air conditioning control method of any of claims 1-12.

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