CN111486560B

CN111486560B - Air conditioner and control method thereof

Info

Publication number: CN111486560B
Application number: CN202010316871.XA
Authority: CN
Inventors: 高思云; 安丰德
Original assignee: Hisense Shandong Air Conditioning Co Ltd
Current assignee: Hisense Shandong Air Conditioning Co Ltd
Priority date: 2020-04-21
Filing date: 2020-04-21
Publication date: 2021-04-30
Anticipated expiration: 2040-04-21
Also published as: CN111486560A

Abstract

The embodiment of the application provides an air conditioner and a control method thereof, relates to the field of air conditioners and solves the problem that the air conditioner cannot normally operate when an evaporator temperature sensor of the air conditioner breaks down. This air conditioner includes: controlling means, induction port temperature sensor and M indoor sets, every indoor set includes: electronic expansion valve, trachea temperature sensor, liquid pipe temperature sensor, evaporimeter temperature sensor. The control device is used for: when only one indoor unit in at least one indoor unit is started to operate and a fault signal sent by an evaporator temperature sensor of the started and operated indoor unit at a first moment is detected, if the operation time of the compressor does not meet the preset time, determining the temperature of the liquid pipe as a target temperature; if the running time of the compressor meets the preset time, adjusting the target temperature according to the air pipe temperature, the air suction port temperature and the liquid pipe temperature; the target temperature is used to indicate the temperature of the evaporator of the indoor unit that starts operation.

Description

Air conditioner and control method thereof

Technical Field

The application relates to the field of air conditioners, in particular to an air conditioner and a control method thereof.

Background

In a conventional air conditioner, an evaporator temperature sensor is generally mounted on an evaporator. The evaporator temperature sensor is mainly used for detecting the internal temperature of the evaporator, and sending abnormal information to the control device of the air conditioner when the internal temperature of the evaporator is abnormal, so that the control device controls the opening degree of the electronic expansion valve, further controlling the flow of a refrigerant, and preventing the phenomena that the internal temperature of the evaporator of the air conditioner is too low, freezing occurs, or the internal temperature of the evaporator of the air conditioner is too high, overload occurs and the like.

Since the evaporator temperature sensor is a very important component in air conditioner control, when the evaporator temperature sensor fails, the control device usually controls the air conditioner to stop operating and starts operating after the evaporator temperature sensor returns to normal. Under the condition, the air conditioner cannot be normally used, and the user experience is greatly reduced.

Disclosure of Invention

The application provides an air conditioner and a control method thereof, which solve the problem that the air conditioner cannot normally operate when an evaporator temperature sensor of the air conditioner breaks down.

In order to achieve the purpose, the technical scheme is as follows:

in a first aspect, the present application provides an air conditioner comprising: controlling means, an induction port temperature sensor and M indoor units that are used for detecting the temperature of the compressor induction port department of air conditioner, every indoor unit includes: the air conditioner comprises an electronic expansion valve for adjusting the flow of a refrigerant in the air conditioner, an air pipe temperature sensor for detecting the temperature of a gas pipeline of the air conditioner, a liquid pipe temperature sensor for detecting the temperature of a liquid pipeline of the air conditioner, and an evaporator temperature sensor for detecting the temperature of an evaporator of the air conditioner. The electronic expansion valve, the air pipe temperature sensor, the liquid pipe temperature sensor, the evaporator temperature sensor and the air suction port temperature sensor are all connected with the control device. The control device is used for:

when only one indoor unit in at least one indoor unit is started, if a fault signal sent by an evaporator temperature sensor of the started indoor unit at a first moment is detected, the air pipe temperature, the air suction port temperature and the liquid pipe temperature are obtained. The air pipe temperature is detected by an air pipe temperature sensor of the indoor unit which starts to operate at a first moment. The inlet temperature is a temperature detected by the inlet temperature sensor at the first timing. The liquid pipe temperature is the temperature detected by a liquid pipe temperature sensor of the indoor unit which starts to operate at the first moment.

And then judging whether the running time of the compressor meets the preset time. And if the running time of the compressor does not meet the preset time, determining the temperature of the liquid pipe as the target temperature. And if the running time of the compressor meets the preset time, adjusting the target temperature according to the air pipe temperature, the air suction port temperature and the liquid pipe temperature. The target temperature is used to indicate the temperature of the evaporator of the indoor unit that starts operation.

It can be seen that, when the evaporator temperature sensor breaks down, the control device can replace the evaporator temperature detected by the evaporator temperature sensor according to the temperatures detected by the temperature sensors (including the air pipe temperature sensor, the liquid pipe temperature sensor and the air suction port temperature sensor) arranged at other positions, thereby ensuring the normal operation of the air conditioner. Compared with the prior art, the problem that the air conditioner cannot normally operate when an evaporator temperature sensor of the air conditioner breaks down is solved, and user experience is improved.

In a second aspect, the present application provides a control method of an air conditioner, which is applied to the air conditioner of the first aspect, including: when only one indoor unit in at least one indoor unit is started, if a fault signal sent by an evaporator temperature sensor of the started indoor unit at a first moment is detected, the air pipe temperature detected by an air pipe temperature sensor of the indoor unit at the first moment, the air suction port temperature detected by an air suction port temperature sensor at the first moment and the liquid pipe temperature detected by a liquid pipe temperature sensor of the indoor unit at the first moment are obtained.

And then judging whether the running time of the compressor meets the preset time. And if the running time of the compressor does not meet the preset time, determining the temperature of the liquid pipe as the target temperature. And if the running time of the compressor meets the preset time, adjusting the target temperature according to the air pipe temperature, the air suction port temperature and the liquid pipe temperature.

In a third aspect, the present invention provides a computer-readable storage medium storing one or more programs, the one or more programs including instructions, which when executed by a control apparatus of an air conditioner, cause the control apparatus of the air conditioner to perform the control method of the air conditioner as described in the second aspect.

In a fourth aspect, the present invention provides a computer program product comprising instructions which, when run on a control device of an air conditioner, cause the control device of the air conditioner to perform the control method of the air conditioner as described in the second aspect.

In a fifth aspect, the present invention provides a control device for an air conditioner, comprising: a processor and a memory, the memory being used for storing a program, the processor calling the program stored in the memory to execute the control method of the air conditioner according to the second aspect.

For a detailed description of the second to fifth aspects and their various implementations in this application, reference may be made to the detailed description of the first aspect and its various implementations; moreover, the beneficial effects of the second aspect to the fifth aspect and the various implementation manners thereof may refer to the beneficial effect analysis of the first aspect and the various implementation manners thereof, and are not described herein again.

These and other aspects of the present application will be more readily apparent from the following description.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

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

fig. 2 is a schematic flowchart of a control method of an air conditioner according to an embodiment of the present disclosure;

fig. 3 is a schematic flowchart of a control method of an air conditioner according to another embodiment of the present disclosure;

fig. 4 is a schematic flowchart of a control method of an air conditioner according to another embodiment of the present disclosure;

fig. 5 is a schematic flowchart of a control method of an air conditioner according to another embodiment of the present disclosure;

fig. 6 is a schematic flowchart of a control method of an air conditioner according to another embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a control device of an air conditioner according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art. In addition, when a pipeline is described, the terms "connected" and "connected" are used in this application to have a meaning of conducting. The specific meaning is to be understood in conjunction with the context.

In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described as "exemplary" or "e.g.," an embodiment of the present invention is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

As described in the background art, the control device generally controls the air conditioner to stop operating when the evaporator temperature sensor malfunctions, and starts operating after the evaporator temperature sensor is restored to normal. Under the condition, the air conditioner cannot be normally used, and the user experience is greatly reduced.

To above-mentioned technical problem, the application provides an air conditioner, when evaporimeter temperature sensor broke down, controlling means can replace the evaporimeter temperature that evaporimeter temperature sensor detected according to the temperature that temperature sensor (including trachea temperature sensor, liquid pipe temperature sensor and induction port temperature sensor) that other positions set up detected, and then guaranteed that the air conditioner can normal operating.

The air conditioner can be a one-to-one air conditioner (i.e., an air conditioner in which one outdoor unit drives one indoor unit), or a multi-split air conditioning system (i.e., an air conditioning system in which one outdoor unit drives a plurality of indoor units), which is not limited in the embodiments of the present application. In a multi-split air conditioning system, if only one indoor unit is started to operate, the control method of the air conditioner provided in the embodiment of the present application is the same as the control method of the one-split air conditioner, and therefore, for convenience of description, the embodiment of the present application takes the one-split air conditioning system as an example for description.

Taking a drag-five air conditioner as an example, as shown in fig. 1, the drag-five air conditioner is an air conditioner in which an outdoor unit 100 drags five indoor units 200 at the same time.

The indoor unit 200 includes: evaporators (11-1, 11-2, 11-3, 11-4, 11-5), evaporator temperature sensors (12-1, 12-2, 12-3, 12-4, 12-5) for detecting the evaporator temperature, and a motor, a fan, etc., not shown in fig. 1.

Optionally, the embodiment of the application can be applied to a cooling mode or a dehumidification mode of an air conditioner. In the cooling mode or the dehumidification mode, the liquid refrigerant in the evaporator evaporates and absorbs heat in the air to achieve cooling, and heat is convected through the air duct system of the indoor unit 200.

The outdoor unit 100 includes: the air conditioner comprises electronic expansion valves (10-1, 10-2, 10-3, 10-4 and 10-5) for adjusting the flow rate of a refrigerant in the air conditioner, liquid pipe temperature sensors (13-1, 13-2, 13-3, 13-4 and 13-5) for detecting the temperature of a liquid pipeline of the air conditioner, air pipe temperature sensors (14-1, 14-2, 14-3, 14-4 and 14-5) for detecting the temperature of a gas pipeline of the air conditioner and an air suction port temperature sensor (15) for detecting the temperature of an air suction port of a compressor of the air conditioner.

Alternatively, the electronic expansion valve may be replaced by an electric regulating valve, and may also be replaced by another valve for regulating the opening degree, which is not limited in the embodiment of the present application.

The outdoor unit 100 further includes: a compressor 1, an exhaust muffler 2, a four-way valve 3, a condenser 4, a filter 5, and an oil separator, a condensing fan, an outdoor controller, etc., which are not shown in fig. 1.

The outdoor unit 100 is made of a multi-pipe system, corresponds to a plurality of sets of stop valves, and is connected to the indoor unit 200 through an on-line pipe (a liquid pipe and a gas pipe) to form a complete refrigerant circulation loop. Each set of stop valves respectively comprises a coarse valve (16-1, 16-2, 16-3, 16-4, 16-5) and a fine valve (17-1, 17-2, 17-3, 17-4, 17-5) in each online pipe.

In the air conditioner, five indoor units 200, evaporators (11-1, 11-2, 11-3, 11-4 and 11-5), evaporator temperature sensors (12-1, 12-2, 12-3, 12-4 and 12-5), electronic expansion valves (10-1, 10-2, 10-3, 10-4 and 10-5), liquid pipe temperature sensors (13-1, 13-2, 13-3, 13-4 and 13-5), air pipe temperature sensors (14-1, 14-2, 14-3, 14-4 and 14-5), coarse valves (16-1, 16-2, 16-3, 16-4 and 16-5) and fine valves (17-1, 17-2, 17-3, 17-4 and 14-5), 17-4, 17-5) are in one-to-one correspondence.

The evaporator temperature sensors are respectively connected with the corresponding evaporators (for example, the evaporator temperature sensor 12-1 is arranged on the corresponding evaporator 11-1).

The electronic expansion valve, the liquid pipe temperature sensor and the fine valve are sequentially arranged between the filter 5 and the evaporator corresponding to the fine valve (for example, the electronic expansion valve 10-1, the liquid pipe temperature sensor 13-1 and the fine valve 17-1 are sequentially arranged between the filter 5 and the evaporator 11-1). The electronic expansion valve is close to one side of the filter 5, and the fine valve is close to one side of the evaporator.

The inlet temperature sensor 15 is provided between the inlet of the compressor 1 and the four-way valve 3 and near the inlet of the compressor 1.

The air pipe temperature sensor and the coarse valve are sequentially arranged between the four-way valve 3 and the evaporator corresponding to the coarse valve (for example, the air pipe temperature sensor 14-1 and the coarse valve 16-1 are sequentially arranged between the air suction port temperature sensor 15 and the evaporator 11-1). The air pipe temperature sensor is close to one side of the four-way valve 3, and the coarse valve is close to one side of the evaporator.

The one-driving-five air conditioner further comprises a control device 300 (not shown in fig. 1), wherein evaporator temperature sensors (12-1, 12-2, 12-3, 12-4 and 12-5), electronic expansion valves (10-1, 10-2, 10-3, 10-4 and 10-5), liquid pipe temperature sensors (13-1, 13-2, 13-3, 13-4 and 13-5), air pipe temperature sensors (14-1, 14-2, 14-3, 14-4 and 14-5) and an air suction port temperature sensor 15 are all connected with the control device 300. This controlling means 300 is used for when evaporimeter temperature sensor breaks down, and controlling means can replace the evaporimeter temperature that evaporimeter temperature sensor detected according to the temperature that temperature sensor (including trachea temperature sensor, liquid pipe temperature sensor and induction port temperature sensor) that other positions set up detected, and then guaranteed that the air conditioner can normal operating.

The following describes a control method of an air conditioner provided in an embodiment of the present application.

The control device of the air conditioner provided by the embodiment of the application can be applied to a one-driving-one air conditioner and can also be applied to a multi-driving-one air conditioner system. When the control device is applied to a multi-split air conditioning system, the control device can be used for control methods under two conditions, which are respectively as follows: there are only a control method in which one indoor unit is started up and operated (referred to as "single-unit control method" for short) and a control method in which a plurality of indoor units are simultaneously started up and operated (referred to as "multi-unit control method" for short). When the control device is applied to a one-drag-one air conditioner, reference may be made to the description that the control device is used for the "stand-alone control method".

The "stand-alone control method" will be described first.

As shown in fig. 1, since only one indoor unit of the air conditioning system is operated, the control device 300 has a consistent control method for any one of the evaporators (11-1, 11-2, 11-3, 11-4, 11-5), evaporator temperature sensors (12-1, 12-2, 12-3, 12-4, 12-5), electronic expansion valves (10-1, 10-2, 10-3, 10-4, and 10-5), liquid pipe temperature sensors (13-1, 13-2, 13-3, 13-4, 13-5), and air pipe temperature sensors (14-1, 14-2, 14-3, 14-4, and 14-5), and thus the control device 300 acquires the evaporator temperature sensors 12-1, 14-2, 14-3, 14-4, and 14-5 according to the embodiment of the present invention, The temperature detected by the liquid pipe temperature sensor 13-1 and the gas pipe temperature sensor 14-1 and the control of the electronic expansion valve 10-1 are exemplified.

Example one

Referring to fig. 1, the "stand-alone control method" includes S201 to S204, as shown in fig. 2.

S201, if a fault signal sent by an evaporator temperature sensor of an indoor unit which starts running at a first moment is detected, the control device acquires the air pipe temperature, the air suction port temperature and the liquid pipe temperature.

The air pipe temperature is detected by an air pipe temperature sensor of the indoor unit which is started to operate at the first moment. The inlet temperature is a temperature detected by the inlet temperature sensor at the first timing. The liquid pipe temperature is the temperature detected by a liquid pipe temperature sensor of the indoor unit which starts to operate at the first moment.

S202, the control device judges whether the running time of the compressor meets the preset time.

Specifically, when a fault signal sent by an evaporator temperature sensor of an indoor unit which starts to operate at a first moment is detected, the control device judges whether the operation time length of the compressor meets a preset time length. If the control device determines that the operation time of the compressor does not meet the preset time, S203 is executed. If the control device determines that the operation time period of the compressor meets the preset time period, S204 is executed.

S203, the control device determines the liquid pipe temperature as the target temperature.

The target temperature is used to indicate the temperature of the evaporator of the indoor unit that is activated to operate.

When the control device determines that the running time of the compressor does not meet the preset time, the process of exchanging heat with air by the refrigerant in the evaporator of the running indoor unit is not finished. In this case, since the suction port temperature sensor and the air pipe temperature sensor of the indoor unit in the start-up operation are disposed between the outlet of the heat exchanger of the indoor unit in the start-up operation and the compressor, the fluctuation of the air pipe temperature and the suction port temperature is large. Accordingly, since the liquid pipe is disposed between the compressor and the inlet of the heat exchanger of the indoor unit that is started to operate, the fluctuation of the liquid pipe temperature is small. In this case, when detecting a failure signal sent by the evaporator temperature sensor of the indoor unit that is started to operate at the first time, in order to ensure that the air conditioner can operate normally, the control device may determine the liquid pipe temperature as the temperature of the evaporator of the indoor unit that is started to operate, that is, replace the function of the evaporator temperature sensor that has failed with the temperature detected by the liquid pipe temperature sensor, and implement control of the air conditioner (for example, adjusting the opening degree of the electronic expansion valve) according to the liquid pipe temperature, thereby ensuring that the air conditioner can operate normally.

And S204, adjusting the target temperature by the control device according to the air pipe temperature, the air suction port temperature and the liquid pipe temperature.

When the control device determines that the running time of the compressor meets the preset time, the process of heat exchange between the refrigerant in the evaporator of the running indoor unit and air is completed. In this case, the air pipe temperature, the suction port temperature, and the liquid pipe temperature tend to be stable. At the moment, the control device adjusts the target temperature according to the air pipe temperature, the air suction port temperature and the liquid pipe temperature, and further ensures that the air conditioner can be started and operated normally.

In summary, when the evaporator temperature sensor breaks down, the control device can replace the evaporator temperature detected by the evaporator temperature sensor according to the temperatures detected by the temperature sensors (including the air pipe temperature sensor, the liquid pipe temperature sensor and the air suction port temperature sensor) arranged at other positions, so as to ensure the normal operation of the air conditioner. Compared with the prior art, the problem that the air conditioner cannot normally operate when an evaporator temperature sensor of the air conditioner breaks down is solved, and user experience is greatly improved.

Example two

Referring to fig. 1 and 2, as shown in fig. 3, the control device specifically includes S205 to S207 when adjusting the target temperature according to the air pipe temperature, the suction port temperature, and the liquid pipe temperature. I.e. S204 above may be replaced by S205-S207.

S205, the control device determines a first difference.

Wherein, the first difference is the value obtained by subtracting the temperature of the air suction port from the temperature of the air pipe.

When a fault signal sent by an evaporator temperature sensor of an indoor unit which starts to operate at a first moment is detected, in order to ensure that the air conditioner can normally operate, the control device can adjust the target temperature according to the first difference value, and the accuracy of the target temperature is ensured.

S206, the control device determines a second difference value.

Wherein the second difference is the value of the trachea temperature minus the liquid tube temperature.

When the target temperature is adjusted, the first difference can only judge whether the refrigerant in the evaporator of the indoor unit in starting operation is completely evaporated, but cannot accurately judge the specific flow rate of the refrigerant flowing out of the evaporator of the indoor unit in starting operation, and the air pipe temperature and the liquid pipe temperature are respectively the temperature at the inlet and the temperature at the outlet of the evaporator of the indoor unit in starting operation, so the control device can also determine the specific flow rate of the refrigerant in the evaporator of the indoor unit in starting operation according to the second difference between the air pipe temperature and the liquid pipe temperature. The control device judges according to the matching of the first difference and the second difference, can accurately adjust the target temperature, and further ensures the accuracy of the target temperature.

And S207, adjusting the target temperature by the control device according to the first difference, the second difference, the air pipe temperature and the liquid pipe temperature.

Specifically, after the first difference and the second difference are determined, the control device adjusts the target temperature according to the first difference, the second difference, the gas pipe temperature, and the liquid pipe temperature. The method specifically comprises the following nine conditions A-I:

A. if the first difference is larger than the first threshold value and the second difference is larger than the second threshold value, the control device takes the liquid pipe temperature as the initial temperature of the target temperature and periodically adjusts the size of the target temperature according to a preset adjustment value until the target temperature is a first target value; the first target value is a temperature value of the air pipe after the temperature of the air pipe is reduced by a first preset value.

It should be noted that, when the control device uses the liquid pipe temperature as the initial temperature of the target temperature and periodically adjusts the target temperature according to the preset adjustment value, if the target temperature does not reach the first target value after the target temperature is adjusted in the first period, the target temperature after adjustment according to the first period replaces the function of the evaporator temperature sensor that has failed, and the control of the air conditioner (for example, the adjustment of the opening degree of the electronic expansion valve) is realized according to the target temperature after adjustment in the first period, thereby ensuring that the air conditioner can be started and operated normally.

In addition, when the target temperature is larger than the first target value, the control device takes the liquid pipe temperature as the initial temperature of the target temperature, and periodically reduces the target temperature according to a preset adjusting value until the target temperature is the first target value. When the target temperature is lower than the first target value, the control device takes the liquid pipe temperature as the initial temperature of the target temperature, and periodically increases the target temperature according to a preset adjusting value until the target temperature is the first target value. The subsequent cases B-L are identical to the case A and will not be described in detail later.

Illustratively, as shown in fig. 4, the preset target temperature is S, the preset first difference value is P, the second difference value is Q, the trachea temperature is T1, the first threshold value is 2.5 degrees celsius, the second threshold value is 6 degrees celsius, the preset adjustment value is 0.5 degrees celsius, and the period is 20 seconds. The above case a corresponds to the case a in fig. 4, specifically:

a. when P ∈ (2.5, + ∞), Q ∈ (6, + ∞), the control device sets the liquid pipe temperature as the initial temperature of S, and adjusts the size of S every 20 seconds according to the adjustment value of 0.5 ℃ until S ∈ T1-2.

B. If the first difference is larger than the first threshold, the second difference is larger than or equal to the third threshold, and the second difference is smaller than or equal to the second threshold, the liquid pipe temperature is taken as the initial temperature of the target temperature, and the target temperature is periodically adjusted according to a preset adjustment value until the target temperature is a second target value; the second target value is a temperature value obtained after the temperature of the air pipe is reduced by a second preset value; the second preset value is smaller than the first preset value.

Illustratively, in connection with case a, the preset third threshold is 3 degrees celsius, as shown in fig. 4. The above case B corresponds to the case B in fig. 4, specifically:

b. when P ∈ (2.5, + ∞), Q ∈ [3,6], the control device sets the liquid pipe temperature to the initial temperature of S, and adjusts the size of S once every 20 seconds according to the adjustment value of 0.5 ℃ until S ∈ T1-1.

C. If the first difference is larger than the first threshold value and the second difference is smaller than the third threshold value, taking the liquid pipe temperature as the initial temperature of the target temperature, and periodically adjusting the size of the target temperature according to a preset adjustment value until the target temperature is a third target value; the third target value is the average of the gas pipe temperature and the liquid pipe temperature.

Illustratively, in conjunction with case a or case b, the preset manifold temperature is T2, as shown in fig. 4. The above case C corresponds to the case C in fig. 4, specifically:

c. when P ∈ (2.5, + ∞), Q ∈ (— ∞, 3), the control device sets the liquid pipe temperature as the initial temperature of S, and adjusts the size of S once every 20 seconds according to the adjustment value of 0.5 ℃ until S ∈ (T1+ T2)/2.

D. If the first difference is greater than or equal to the fourth threshold, the first difference is less than or equal to the first threshold, and the second difference is greater than the second threshold, the liquid pipe temperature is taken as the initial temperature of the target temperature, and the target temperature is periodically adjusted according to a preset adjustment value until the target temperature is the first target value.

Illustratively, in conjunction with case a, case b, or case c, as shown in fig. 4, the preset fourth threshold is 0 degrees celsius. The above case D corresponds to the case D in fig. 4, and specifically includes:

d. when P is equal to 0,2.5 and Q is equal to (6, infinity), the control device takes the liquid pipe temperature as the initial temperature of S and adjusts the size of S once every 20 seconds according to the adjustment value of 0.5 ℃ until S is equal to T1-2.

E. If the first difference is greater than or equal to the fourth threshold, the first difference is less than or equal to the first threshold, the second difference is greater than or equal to the fifth threshold, and the second difference is less than or equal to the second threshold, the liquid pipe temperature is taken as the initial temperature of the target temperature, and the target temperature is periodically adjusted according to a preset adjustment value until the target temperature is a fourth target value; the fourth target value is a temperature value after the temperature of the liquid pipe rises by a third preset value.

Illustratively, in combination with the case a, the case b, the case c, or the case d, as shown in fig. 4, the preset fifth threshold is 4 degrees celsius. The above case E corresponds to the case E in fig. 4, and specifically includes:

e. when P is equal to 0,2.5 and Q is equal to 4,6, the control device takes the liquid pipe temperature as the initial temperature of S and adjusts the size of S once every 20 seconds according to the adjustment value of 0.5 ℃ until S is equal to T2+ 1.

F. If the first difference is greater than or equal to the fourth threshold, the first difference is less than or equal to the first threshold, the second difference is greater than or equal to the fourth threshold, and the second difference is less than the fifth threshold, the liquid pipe temperature is taken as the initial temperature of the target temperature, and the target temperature is periodically adjusted according to the preset adjustment value until the target temperature is a third target value.

Exemplarily, combining the case a, the case b, the case c, the case d, or the case e, as shown in fig. 4, the case F corresponds to the case F in fig. 4, specifically:

f. and when the P belongs to [0,2.5] and the Q belongs to [0,4 ], the control device takes the liquid pipe temperature as the initial temperature of the S, and adjusts the size of the S once every 20 seconds according to the adjustment value of 0.5 ℃ until the S is equal to (T1+ T2)/2.

G. If the first difference is greater than or equal to the fourth threshold, the first difference is less than or equal to the first threshold, and the second difference is less than the fourth threshold, the liquid pipe temperature is taken as the initial temperature of the target temperature, and the target temperature is periodically adjusted according to the preset adjustment value until the target temperature is the value of the gas pipe temperature.

Exemplarily, combining the case a, the case b, the case c, the case d, the case e, or the case f, as shown in fig. 4, the case G corresponds to the case G in fig. 4, and specifically, the case G is:

g. when P ∈ [0,2.5], Q ∈ (— ∞,0), the control device sets the liquid pipe temperature as the initial temperature of S, and adjusts the size of S every 20 seconds according to the adjustment value of 0.5 degrees centigrade until S ∈ [ T1 ].

H. If the first difference is smaller than the fourth threshold value and the second difference is smaller than the fourth threshold value, the liquid pipe temperature is taken as the initial temperature of the target temperature, and the target temperature is periodically adjusted according to a preset adjustment value until the target temperature is the value of the air pipe temperature.

Illustratively, combining the case a, the case b, the case c, the case d, the case e, the case f, or the case g, as shown in fig. 4, the case H corresponds to the case H in fig. 4, specifically:

h. when P ∈ (— ∞,0) and Q ∈ (— ∞,0), the control device sets the liquid pipe temperature as the initial temperature of S, and adjusts the size of S every 20 seconds according to the adjustment value of 0.5 degrees centigrade until S ∈ (— ∞,0) is T1.

I. If the first difference is smaller than the fourth threshold and the second difference is greater than or equal to the fourth threshold, the liquid pipe temperature is taken as the initial temperature of the target temperature, and the target temperature is periodically adjusted according to a preset adjustment value until the target temperature is a third target value.

Illustratively, combining the case a, the case b, the case c, the case d, the case e, the case f, the case g, or the case h, as shown in fig. 4, the case I corresponds to the case I in fig. 4, specifically:

i. when P ∈ (— ∞,0), Q ∈ [0, + ∞), the control device sets the liquid pipe temperature as the initial temperature of S, and adjusts the size of S once every 20 seconds according to the adjustment value of 0.5 ℃ until S ∈ (T1+ T2)/2.

In summary, the control device first determines the value range of the first difference, then determines the value range of the second difference according to the value range of the first difference, and adjusts the target temperature according to the value ranges of the first difference and the second difference, the air pipe temperature and the liquid pipe temperature.

Therefore, when the evaporator temperature sensor breaks down, the control device can replace the evaporator temperature detected by the evaporator temperature sensor according to the temperature detected by the temperature sensors (including the air pipe temperature sensor, the liquid pipe temperature sensor and the air suction port temperature sensor) arranged at other positions, and the normal operation of the air conditioner is further ensured. Compared with the prior art, the problem that the air conditioner cannot normally operate when an evaporator temperature sensor of the air conditioner breaks down is solved, and user experience is greatly improved.

EXAMPLE III

The "multi-machine control method" will be described below.

In the multi-machine control method, N indoor machines are started to operate in M indoor machines of the air conditioning system. N is a positive integer less than or equal to M. As shown in fig. 1, when M is 5, the air conditioner is a one-to-five air conditioning system. The 'multi-machine control method' is that N indoor machines are started to operate in M indoor machines. N is a positive integer greater than 1 and less than or equal to M.

Since a plurality of indoor units operate in the one-drive-five air conditioning system, for convenience of description, in the embodiment of the present application, five indoor units operate simultaneously in the one-drive-five air conditioning system, and the evaporator temperature sensor 12-1 fails, and the evaporator temperature sensor 12-2, the evaporator temperature sensor 12-3, the evaporator temperature sensor 12-4, and the evaporator temperature sensor 12-5 do not fail, for example, the description is given.

Referring to fig. 1, as shown in fig. 5, the "multi-machine control method" includes S401 to S404.

S401, if a fault signal sent by an evaporator temperature sensor of an indoor unit which starts running at a first moment is detected, the control device acquires the air pipe temperature, the air suction port temperature and the liquid pipe temperature.

The gas pipe temperature, the suction port temperature and the liquid pipe temperature can refer to the description in S201, and are not described herein again.

S402, the control device acquires the average temperature of the evaporator.

Wherein the average evaporator temperature is: the average value of the temperatures detected by the evaporator temperature sensors of the indoor units other than the target indoor unit at the first time among the N indoor units. The target indoor unit is an indoor unit corresponding to the evaporator temperature sensor which sends a fault signal at the first moment.

Illustratively, referring to fig. 1, the average evaporator temperature is an average value of temperatures detected by the evaporator temperature sensors (the evaporator temperature sensor 12-2, the evaporator temperature sensor 12-3, the evaporator temperature sensor 12-4, the evaporator temperature sensor 12-5) other than the malfunctioning evaporator temperature sensor 12-1 among the 5 evaporator temperature sensors at the first time.

S403, the control device determines a third difference value.

Wherein the third difference is the temperature of the air intake minus the temperature of the air pipe.

When detecting the fault signal that evaporimeter temperature sensor sent at the first moment, in order to guarantee that the air conditioner can normal operating, controlling means can adjust the target temperature according to the third difference, has guaranteed the degree of accuracy of target temperature.

And S404, the control device adjusts the target temperature according to the third difference, the air pipe temperature, the liquid pipe temperature and the average temperature of the evaporator.

After the temperature of the evaporator detected by the evaporator temperature sensor with the fault is replaced by the target temperature, the third difference value can only judge whether the refrigerant in the evaporator with the fault is completely evaporated, but cannot accurately judge the specific flow of the refrigerant flowing out of the evaporator with the fault. In this case, since the other indoor units are normally operated, the control device may determine the specific flow rate of the refrigerant of the evaporator according to the average temperature of the evaporator. The specific flow of the refrigerant flowing out of the evaporator with the fault is not required to be judged according to the difference value of the temperature of the air pipe and the temperature of the liquid pipe, and compared with a single-machine control method, the method is more convenient and improves the efficiency of the control method.

Specifically, after determining the third difference and the average evaporator temperature, the control device adjusts the target temperature according to the third difference, the air pipe temperature, the liquid pipe temperature, and the average evaporator temperature. The method specifically comprises the following three conditions of J-L, specifically as follows:

J. if the third difference is greater than or equal to the sixth threshold, the liquid pipe temperature is taken as the initial temperature of the target temperature, and the target temperature is periodically adjusted according to a preset adjustment value until the target temperature is a fifth target value; the fifth target value is a temperature value after the liquid pipe temperature is reduced by a fourth preset value.

Illustratively, the preset target temperature is S, the preset third difference value is R, the liquid pipe temperature is T2, the sixth threshold value is 3 degrees celsius, the preset adjustment value is 0.5 degrees celsius, and the period is 20 seconds. As shown in fig. 6, the case J corresponds to the case J in fig. 6, specifically:

j. when R epsilon (3, a +/-infinity) exists, the control device takes the liquid pipe temperature as the initial temperature of S, and adjusts the size of S once every 20 seconds according to the adjustment value of 0.5 ℃ until the S is T2-2.

K. If the third difference is smaller than or equal to the seventh threshold, taking the liquid pipe temperature as the initial temperature of the target temperature, and periodically adjusting the magnitude of the target temperature according to a preset adjustment value until the target temperature is a sixth target value; the sixth target value is a temperature value of the air pipe after the air pipe temperature rises by a fourth preset value.

Illustratively, the preset airway temperature is T1 and the seventh threshold is-3 degrees Celsius. With reference to the case j, as shown in fig. 6, the case K corresponds to the case K in fig. 6, and specifically includes:

k. when R epsilon-3, the control device takes the liquid pipe temperature as the initial temperature of S, and adjusts the size of S every 20 seconds according to the adjustment value of 0.5 ℃ until the S is T1+ 2.

And L, if the third difference is smaller than a sixth threshold and the third difference is larger than a seventh threshold, taking the liquid pipe temperature as the initial temperature of the target temperature, and periodically adjusting the size of the target temperature according to a preset adjustment value until the target temperature is the value of the average temperature of the evaporator.

Illustratively, the preset evaporator average temperature is T3. Combining the case j or the case k, as shown in fig. 6, the case L corresponds to the case L in fig. 6, specifically:

and l, when the temperature of the liquid pipe is equal to the initial temperature of S when the temperature of the liquid pipe is equal to R epsilon (- ∞ -3), and the control device adjusts the size of S once every 20 seconds according to the adjustment value of 0.5 ℃ until the S is equal to T3.

In summary, the control device determines the value range of the third difference, and adjusts the target temperature according to the value range of the third difference, the air pipe temperature, the liquid pipe temperature and the average evaporator temperature.

The embodiment of the application provides an air conditioner, includes: controlling means, an induction port temperature sensor and M indoor units that are used for detecting the temperature of the compressor induction port department of air conditioner, every indoor unit includes: the air conditioner comprises an electronic expansion valve for adjusting the flow of a refrigerant in the air conditioner, an air pipe temperature sensor for detecting the temperature of a gas pipeline of the air conditioner, a liquid pipe temperature sensor for detecting the temperature of a liquid pipeline of the air conditioner, and an evaporator temperature sensor for detecting the temperature of an evaporator of the air conditioner. The electronic expansion valve, the air pipe temperature sensor, the liquid pipe temperature sensor, the evaporator temperature sensor and the air suction port temperature sensor are all connected with the control device. The control device is used for:

It can be seen that, when the evaporator temperature sensor breaks down, the control device can replace the evaporator temperature detected by the evaporator temperature sensor according to the temperatures detected by the temperature sensors (including the air pipe temperature sensor, the liquid pipe temperature sensor and the air suction port temperature sensor) arranged at other positions, thereby ensuring the normal operation of the air conditioner. Compared with the prior art, the problem that the air conditioner cannot normally operate when an evaporator temperature sensor of the air conditioner breaks down is solved, and user experience is greatly improved.

In addition, as shown in fig. 7, a schematic diagram of a possible structure of the control device provided in the embodiment of the present application is shown. The control device 60 includes: a processor 601, a memory 603. Optionally, the control device 60 further includes: a transceiver 602, and a bus 604.

The processor 601, the transceiver 602, and the memory 603 are connected to each other through a bus 604; the bus 604 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.

The processor 601 may be a general-purpose Central Processing Unit (CPU), a microprocessor, an Application-Specific Integrated Circuit (ASIC), or one or more Integrated circuits for controlling the execution of programs in accordance with the present invention.

The Memory 603 may be a Read-Only Memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to these. The memory may be self-contained and coupled to the processor via a bus. The memory may also be integral to the processor.

The memory 602 is used for storing application program codes for executing the scheme of the application, and the processor 601 controls the execution. The transceiver 602 is configured to receive input from an external device, and the processor 601 is configured to execute application program codes stored in the memory 603, so as to enable the control device 60 to implement the functions of the control device in the control method of the refrigeration device provided in the embodiment of the present application.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented using a software program, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions described in accordance with the embodiments of the present application are all or partially generated upon loading and execution of computer program instructions on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optics, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or can comprise one or more data storage devices, such as a server, a data center, etc., that can be integrated with the medium. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An air conditioner comprising a control device, an air suction port temperature sensor, and M indoor units, each of the M indoor units comprising: the system comprises an electronic expansion valve, an air pipe temperature sensor, a liquid pipe temperature sensor and an evaporator temperature sensor; the electronic expansion valve, the air pipe temperature sensor, the liquid pipe temperature sensor, the evaporator temperature sensor and the air suction port temperature sensor are all connected with the control device; m is a positive integer; the electronic expansion valve is used for adjusting the flow of a refrigerant in the air conditioner; the air pipe temperature sensor is used for detecting the temperature of an air pipeline of the air conditioner; the liquid pipe temperature sensor is used for detecting the temperature of a liquid pipeline of the air conditioner; the evaporator temperature sensor is used for detecting the temperature of an evaporator of the air conditioner; the air suction port temperature sensor is used for detecting the temperature at the air suction port of the compressor of the air conditioner; characterized in that the control device is adapted to:

when only one indoor unit of the M indoor units is started to operate, if a fault signal sent by an evaporator temperature sensor of the started and operated indoor unit at a first moment is detected, acquiring the temperature of an air pipe, the temperature of an air suction port and the temperature of a liquid pipe; the air pipe temperature is detected by an air pipe temperature sensor of the indoor unit which is started to operate at the first moment; the temperature of the air suction port is detected by the air suction port temperature sensor at the first moment; the liquid pipe temperature is detected by a liquid pipe temperature sensor of the indoor unit which starts to operate at the first moment;

judging whether the operation time of the compressor meets a preset time;

if the running time of the compressor does not meet the preset time, determining the temperature of the liquid pipe as a target temperature; the target temperature is used for representing the temperature of the evaporator of the indoor unit which starts to operate;

and if the running time of the compressor meets the preset time, adjusting the target temperature according to the air pipe temperature, the air suction port temperature and the liquid pipe temperature.

2. The air conditioner according to claim 1, wherein the control device is specifically configured to:

determining a first difference value; the first difference value is the value obtained by subtracting the temperature of the air suction port from the temperature of the air pipe;

determining a second difference; the second difference is the value of the gas pipe temperature minus the liquid pipe temperature;

adjusting the target temperature according to the first difference, the second difference, the gas pipe temperature and the liquid pipe temperature.

3. The air conditioner according to claim 2, wherein the control device is specifically configured to:

if the first difference is larger than a first threshold value and the second difference is larger than a second threshold value, taking the liquid pipe temperature as the initial temperature of the target temperature, and periodically adjusting the target temperature according to a preset adjustment value until the target temperature is a first target value; the first target value is a temperature value obtained after the temperature of the air pipe is reduced by a first preset value;

if the first difference is larger than the first threshold, the second difference is larger than or equal to a third threshold, and the second difference is smaller than or equal to the second threshold, the liquid pipe temperature is taken as the initial temperature of the target temperature, and the target temperature is periodically adjusted according to the preset adjustment value until the target temperature is a second target value; the second target value is a temperature value obtained after the temperature of the air pipe is reduced by a second preset value; the second preset value is smaller than the first preset value;

if the first difference is larger than the first threshold value and the second difference is smaller than the third threshold value, taking the liquid pipe temperature as the initial temperature of the target temperature, and periodically adjusting the target temperature according to the preset adjustment value until the target temperature is a third target value; the third target value is an average of the gas pipe temperature and the liquid pipe temperature.

4. The air conditioner according to claim 3, wherein the control device is specifically configured to:

if the first difference is greater than or equal to a fourth threshold, the first difference is less than or equal to the first threshold, and the second difference is greater than the second threshold, taking the liquid pipe temperature as the initial temperature of the target temperature, and periodically adjusting the target temperature according to the preset adjustment value until the target temperature is the first target value;

if the first difference is greater than or equal to the fourth threshold, the first difference is less than or equal to the first threshold, the second difference is greater than or equal to the fifth threshold, and the second difference is less than or equal to the second threshold, taking the liquid pipe temperature as the initial temperature of the target temperature, and periodically adjusting the target temperature according to the preset adjustment value until the target temperature is a fourth target value; the fourth target value is a temperature value after the temperature of the liquid pipe rises by a third preset value;

if the first difference is greater than or equal to the fourth threshold, the first difference is less than or equal to the first threshold, the second difference is greater than or equal to the fourth threshold, and the second difference is less than the fifth threshold, the liquid pipe temperature is taken as the initial temperature of the target temperature, and the target temperature is periodically adjusted according to the preset adjustment value until the target temperature is the third target value;

if the first difference is greater than or equal to the fourth threshold, the first difference is less than or equal to the first threshold, and the second difference is less than the fourth threshold, the liquid pipe temperature is taken as the initial temperature of the target temperature, and the target temperature is periodically adjusted according to the preset adjustment value until the target temperature is the value of the gas pipe temperature.

5. The air conditioner according to claim 4, wherein the control device is specifically configured to:

if the first difference is smaller than the fourth threshold value and the second difference is smaller than the fourth threshold value, taking the liquid pipe temperature as the initial temperature of the target temperature, and periodically adjusting the target temperature according to the preset adjustment value until the target temperature is the value of the trachea temperature;

if the first difference is smaller than the fourth threshold and the second difference is greater than or equal to the fourth threshold, the liquid pipe temperature is used as the initial temperature of the target temperature, and the target temperature is periodically adjusted according to the preset adjustment value until the target temperature is the third target value.

6. The air conditioner according to claim 5, wherein the control device is further configured to:

when N indoor units in the M indoor units are started to operate, if the fault signal sent by an evaporator temperature sensor of the started and operated indoor unit at the first moment is detected, acquiring the air pipe temperature, the air suction port temperature and the liquid pipe temperature; n is a positive integer less than or equal to M;

acquiring the average temperature of an evaporator; the average evaporator temperature is: the average value of the temperatures detected by the evaporator temperature sensors of the indoor units except the target indoor unit at the first moment in the N indoor units; the target indoor unit is an indoor unit corresponding to the evaporator temperature sensor which sends the fault signal at the first moment;

determining a third difference; the third difference is the value obtained by subtracting the air pipe temperature from the air suction port temperature;

adjusting the target temperature according to the third difference, the gas pipe temperature, the liquid pipe temperature, and the average evaporator temperature.

7. The air conditioner according to claim 6, wherein the control device is specifically configured to:

if the third difference is greater than or equal to a sixth threshold, taking the liquid pipe temperature as the initial temperature of the target temperature, and periodically adjusting the target temperature according to the preset adjustment value until the target temperature is a fifth target value; the fifth target value is a temperature value of the liquid pipe after the temperature of the liquid pipe is reduced by a fourth preset value;

if the third difference is smaller than or equal to a seventh threshold, taking the liquid pipe temperature as the initial temperature of the target temperature, and periodically adjusting the target temperature according to the preset adjustment value until the target temperature is a sixth target value; the sixth target value is a temperature value after the temperature of the air pipe rises to the fourth preset value;

if the third difference is smaller than the sixth threshold and the third difference is larger than the seventh threshold, the liquid pipe temperature is used as the initial temperature of the target temperature, and the target temperature is periodically adjusted according to the preset adjustment value until the target temperature is the average temperature of the evaporator.

8. A control method of an air conditioner, applied to the air conditioner of any one of claims 1 to 7, the method comprising:

judging whether the operation time of the compressor meets a preset time;

if the running time of the compressor meets the preset time, adjusting the target temperature according to the air pipe temperature, the air suction port temperature and the liquid pipe temperature;

if the running time of the compressor does not meet the preset time, adjusting the target temperature according to the temperature of the liquid pipe;

adjusting the target temperature according to the gas pipe temperature, the air suction port temperature and the liquid pipe temperature.

9. The control method of claim 8, wherein the adjusting the target temperature based on the gas pipe temperature, the suction port temperature, and the liquid pipe temperature comprises:

10. The control method according to claim 8, characterized by further comprising: