CN109455057B

CN109455057B - Air conditioner control method and device, storage medium and air conditioner

Info

Publication number: CN109455057B
Application number: CN201811230688.7A
Authority: CN
Inventors: 李俊峰; 陈华英; 韩雷; 李潇
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2018-10-22
Filing date: 2018-10-22
Publication date: 2020-04-28
Anticipated expiration: 2038-10-22
Also published as: CN109455057A

Abstract

The invention provides an air conditioner control method, an air conditioner control device, a storage medium and an air conditioner, wherein the method comprises the following steps: after receiving an air conditioner starting instruction, judging whether the air conditioner is lack of a refrigerant in a shutdown state; if the air conditioner is judged not to lack the refrigerant in the shutdown state, starting a compressor of the air conditioner; after a compressor of the air conditioner is started, judging whether the air conditioner is lack of a refrigerant in an operation state; and if the air conditioner is judged to lack the refrigerant in the running state, stopping the running of the compressor. The scheme provided by the invention can be used for judging the lack of the refrigerant before and after the compressor is started, so that the lack of the refrigerant is protected more quickly and effectively.

Description

Air conditioner control method and device, storage medium and air conditioner

Technical Field

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

Background

Compared with household and commercial air conditioning units, the operating conditions of the automobile air conditioner are more complex and severe, such as large vibration, high temperature in summer, fast temperature change and the like. In addition, the automobile air conditioner mostly adopts a connection mode of pressing plates in a pressing mode, and the number of joints is large. These factors all cause the vehicle air conditioner to be more prone to cause refrigerant leakage. The existing automobile air conditioner has no main stream refrigerant shortage detection means, and most automobiles judge whether the refrigerant is short or not according to self feeling of users, and the users feel that the air conditioner is not refrigerated and then maintain and add the refrigerant. After the refrigerant leaks, the air conditioner can also normally refrigerate within a certain leakage range, but if the refrigerant is continuously leaked to a certain degree, the refrigeration effect is influenced, so that the temperature in the compressor is overhigh, the abrasion of the compressor is aggravated, and the compressor has the possibility of being burnt if the compressor is operated in a refrigerant-lacking state for a long time.

Disclosure of Invention

The present invention is directed to overcome the above-mentioned drawbacks of the prior art, and provides an air conditioner control method, an air conditioner control device, a storage medium, and an air conditioner, so as to solve the problem that there is no feasible means for detecting whether a refrigerant of an automotive air conditioner is absent in the prior art.

One aspect of the present invention provides an air conditioner control method, including: after receiving an air conditioner starting instruction, judging whether the air conditioner is lack of a refrigerant in a shutdown state; if the air conditioner is judged not to lack the refrigerant in the shutdown state, starting a compressor of the air conditioner; after a compressor of the air conditioner is started, judging whether the air conditioner is lack of a refrigerant in an operation state; and if the air conditioner is judged to lack the refrigerant in the running state, stopping the running of the compressor.

Optionally, the determining whether the air conditioner lacks a refrigerant in a shutdown state includes: and judging whether the air conditioner lacks the refrigerant in the shutdown state or not according to whether the high-pressure saturation temperature of the air conditioner meets the judgment condition for judging whether the refrigerant is lacked in the shutdown state or not.

Optionally, the judgment condition for judging the refrigerant lack in the shutdown state is determined according to the current outdoor environment temperature, and the judgment condition for judging the refrigerant lack in the shutdown state comprises that Tps is less than or equal to α T_{Outer ring}- β, wherein Tps is the high pressure saturation temperature of the air conditioner, T_{Outer ring}α and β are coefficients determined according to a temperature interval in which the current outdoor environment temperature is located in at least two preset temperature intervals.

Optionally, before determining whether the air conditioner lacks a refrigerant in the shutdown state according to whether the high-pressure saturation temperature of the air conditioner satisfies a determination condition for determining that the refrigerant lacks in the shutdown state, the method further includes: detecting whether the air conditioner has a sensor fault; detecting whether a high-voltage sensor of the air conditioner fails or not under the condition that the air conditioner is detected to have a sensor failure: if the high-pressure sensor fails, judging whether the air conditioner is short of refrigerant in a shutdown state or not, and starting a compressor of the air conditioner; if the high-pressure sensor fails, judging whether the air conditioner is lack of refrigerant in a shutdown state or not according to whether the high-pressure saturation temperature of the air conditioner is less than or equal to a preset temperature value or not; if the high-pressure saturation temperature is less than or equal to the preset temperature value, determining that the air conditioner lacks a refrigerant in a shutdown state; and if the high-pressure saturation temperature is greater than the preset temperature value, determining that the air conditioner does not lack a refrigerant in a shutdown state.

Optionally, the determining whether the air conditioner lacks a refrigerant in the shutdown state according to whether the high-pressure saturation temperature of the air conditioner satisfies a determination condition for determining that the refrigerant is absent in the shutdown state includes: if the high-pressure saturation temperature does not meet the judgment condition for judging that the air conditioner is lack of the refrigerant in the shutdown state, determining that the air conditioner is not lack of the refrigerant in the shutdown state; and/or if the high-pressure saturation temperature meets the judgment condition for judging that the refrigerant is lacking in the shutdown state, determining that the refrigerant is lacking in the shutdown state of the air conditioner, and/or if the high-pressure saturation temperature meets the judgment condition for judging that the refrigerant is lacking in the shutdown state, determining whether the accumulated times of the judgment condition for judging that the refrigerant is lacking in the shutdown state is met by the high-pressure saturation temperature reaches the preset times; if the accumulated times reach the preset times, determining that the air conditioner lacks refrigerants in a shutdown state; and if the accumulated times do not reach the preset times, starting the compressor to operate for a third preset time, and then stopping the compressor, and judging whether the air conditioner is lack of refrigerant in a stop state again.

Optionally, the determining whether the air conditioner lacks a refrigerant in the operating state includes: and judging whether the air conditioner lacks the refrigerant in the running state or not according to whether the high-pressure saturation temperature of the air conditioner, the temperature of the indoor and outdoor heat exchangers and/or the indoor and outdoor environment temperature meet the judgment condition for judging whether the running state lacks the refrigerant.

Optionally, the condition for determining that the operating state lacks a refrigerant includes: a determination condition corresponding to a cooling mode and/or a determination condition corresponding to a heating mode; the judgment condition corresponding to the cooling mode includes: a first refrigeration refrigerant shortage determination condition based on an indoor ambient temperature and a temperature of an indoor heat exchanger of the air conditioner; a second refrigeration refrigerant shortage determination condition based on the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger of the air conditioner; and/or a third refrigeration refrigerant shortage determination condition based on the outdoor ambient temperature and the high pressure saturation temperature of the air conditioner; and/or the judgment condition corresponding to the heating mode comprises the following steps: a first heating refrigerant shortage determination condition based on an outdoor ambient temperature and a temperature of an outdoor heat exchanger of the air conditioner; a second heating refrigerant shortage determination condition based on the outdoor heat exchanger temperature and the indoor heat exchanger temperature of the air conditioner; and/or a third heating refrigerant shortage determination condition based on the temperature of the indoor heat exchanger of the air conditioner and the high-pressure saturation temperature.

Optionally, determining whether the air conditioner lacks a refrigerant in the operating state according to whether the high-pressure saturation temperature of the air conditioner, the temperature of the indoor and outdoor heat exchangers, and/or the indoor and outdoor ambient temperatures meet a determination condition for determining that the refrigerant in the operating state lacks a refrigerant, includes: if the high-pressure saturation temperature, the temperature of the indoor and outdoor heat exchangers and/or the indoor and outdoor ambient temperatures of the air conditioner meet the judgment condition for judging that the air conditioner lacks the refrigerant in the running state, determining that the air conditioner lacks the refrigerant in the running state; and/or if the high-pressure saturation temperature of the air conditioner, the temperature of the indoor and outdoor heat exchanger and/or the indoor and outdoor ambient temperatures meet the judgment condition for judging that the running state lacks the refrigerant, judging whether the duration time of the judgment condition for judging that the running state lacks the refrigerant is more than or equal to second preset time; and if the duration time is greater than or equal to the second preset time, determining that the air conditioner is lack of refrigerant in the running state.

Optionally, after the compressor is started to operate for a first preset time, judging whether the air conditioner is lack of refrigerant in the operating state; and/or before judging whether the air conditioner is lack of refrigerant in the running state, the method further comprises the following steps: detecting whether the air conditioner has a sensor fault; judging whether the air conditioner lacks a refrigerant in the running state or not under the condition that the fault of the sensor of the air conditioner is not detected; and if the air conditioner is detected to have a sensor fault, judging whether the air conditioner is lack of refrigerant in the running state or not.

Optionally, the method further comprises: if the air conditioner is judged to lack refrigerant in the shutdown state, the compressor of the air conditioner is forbidden to be started, and/or the prompt message of lack of refrigerant is displayed; and/or if the air conditioner is judged to lack refrigerant in the running state, the normal running of the compressor is kept, and/or the prompting information of lack of refrigerant is displayed.

Another aspect of the present invention provides an air conditioning control apparatus, including: the judging unit is used for judging whether the air conditioner lacks a refrigerant in a shutdown state after receiving an air conditioner starting instruction; the control unit is used for starting a compressor of the air conditioner if the judging unit judges that the air conditioner is in a shutdown state and does not lack a refrigerant; the judging unit is also used for judging whether the air conditioner lacks a refrigerant in the running state after the control unit starts the compressor of the air conditioner; the control unit is further used for stopping the operation of the compressor if the judging unit judges that the air conditioner lacks a refrigerant in the operation state.

Optionally, the determining unit determines whether the air conditioner lacks a refrigerant in a shutdown state, including: and judging whether the air conditioner lacks the refrigerant in the shutdown state or not according to whether the high-pressure saturation temperature of the air conditioner meets the judgment condition for judging whether the refrigerant is lacked in the shutdown state or not.

Optionally, the method further comprises: the first detection unit is used for detecting whether the air conditioner has a sensor fault before the judgment unit judges whether the air conditioner lacks the refrigerant in the shutdown state according to whether the high-pressure saturation temperature of the air conditioner meets the judgment condition for judging that the refrigerant in the shutdown state lacks the refrigerant; a second detection unit for detecting whether a high-pressure sensor of the air conditioner is out of order or not when the first detection unit detects that the air conditioner has a sensor failure: the judging unit is further configured to: if the second detection unit detects that the high-pressure sensor fails, whether the air conditioner is short of refrigerant in a shutdown state is not judged, and a compressor of the air conditioner is started; if the second detection unit detects that the high-pressure sensor does not break down, judging whether the air conditioner is in a shutdown state and lacks a refrigerant according to whether the high-pressure saturation temperature of the air conditioner is less than or equal to a preset temperature value; if the high-pressure saturation temperature is less than or equal to the preset temperature value, determining that the air conditioner lacks a refrigerant in a shutdown state; and if the high-pressure saturation temperature is greater than the preset temperature value, determining that the air conditioner does not lack a refrigerant in a shutdown state.

Optionally, the determining unit determines whether the air conditioner lacks a refrigerant in the shutdown state according to whether the high-pressure saturation temperature of the air conditioner satisfies a determination condition for determining that the refrigerant in the shutdown state lacks a refrigerant, including: if the high-pressure saturation temperature does not meet the judgment condition for judging that the air conditioner is lack of the refrigerant in the shutdown state, determining that the air conditioner is not lack of the refrigerant in the shutdown state; and/or if the high-pressure saturation temperature meets the judgment condition for judging that the refrigerant is lacking in the shutdown state, determining that the refrigerant is lacking in the shutdown state of the air conditioner, and/or if the high-pressure saturation temperature meets the judgment condition for judging that the refrigerant is lacking in the shutdown state, determining whether the accumulated times of the judgment condition for judging that the refrigerant is lacking in the shutdown state is met by the high-pressure saturation temperature reaches the preset times; if the accumulated times reach the preset times, determining that the air conditioner lacks refrigerants in a shutdown state; and if the accumulated times do not reach the preset times, starting the compressor to operate for a third preset time, and then stopping the compressor, and judging whether the air conditioner is lack of refrigerant in a stop state again.

Optionally, the determining unit determines whether the air conditioner lacks a refrigerant in an operating state, and includes: and judging whether the air conditioner lacks the refrigerant in the running state or not according to whether the high-pressure saturation temperature of the air conditioner, the temperature of the indoor and outdoor heat exchangers and/or the indoor and outdoor environment temperature meet the judgment condition for judging whether the running state lacks the refrigerant.

Optionally, the determining unit determines whether the air conditioner lacks a refrigerant in the operating state according to whether the high-pressure saturation temperature of the air conditioner, the temperature of the indoor and outdoor heat exchangers, and/or the indoor and outdoor ambient temperatures meet a determination condition for determining that the refrigerant in the operating state lacks a refrigerant, including: if the high-pressure saturation temperature, the temperature of the indoor and outdoor heat exchangers and/or the indoor and outdoor ambient temperatures of the air conditioner meet the judgment condition for judging that the air conditioner lacks the refrigerant in the running state, determining that the air conditioner lacks the refrigerant in the running state; and/or if the high-pressure saturation temperature of the air conditioner, the temperature of the indoor and outdoor heat exchanger and/or the indoor and outdoor ambient temperatures meet the judgment condition for judging that the running state lacks the refrigerant, judging whether the duration time of the judgment condition for judging that the running state lacks the refrigerant is more than or equal to second preset time; and if the duration time is greater than or equal to the second preset time, determining that the air conditioner is lack of refrigerant in the running state.

Optionally, the judging unit judges whether the air conditioner lacks a refrigerant in the running state after the compressor is started to run for a first preset time; and/or, further comprising: the third detection unit is used for detecting whether the air conditioner has a sensor fault before the judgment unit judges whether the air conditioner is lack of refrigerant in the running state; the judging unit is used for judging whether the air conditioner lacks a refrigerant in the running state or not under the condition that the third detecting unit does not detect that the air conditioner has the sensor fault; and if the third detection unit detects that the air conditioner has a sensor fault, the third detection unit does not judge whether the air conditioner is lack of refrigerant in the running state.

Optionally, the control unit is further configured to: if the judging unit judges that the air conditioner lacks the refrigerant in the shutdown state, the compressor of the air conditioner is forbidden to be started, and/or if the judging unit judges that the air conditioner lacks the refrigerant in the running state, the compressor is kept running normally, and/or the method further comprises the following steps: and the display unit is used for displaying the refrigerant shortage prompt information if the judging unit judges that the air conditioner lacks the refrigerant in the shutdown state or the air conditioner lacks the refrigerant in the running state.

A further aspect of the invention provides a storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of any of the methods described above.

Yet another aspect of the present invention provides an air conditioner comprising a processor, a memory, and a computer program stored on the memory and operable on the processor, wherein the processor implements the steps of any of the methods described above when executing the program.

In another aspect, the invention provides an air conditioner, which comprises the air conditioner control device.

According to the technical scheme of the invention, the judgment of lack of the refrigerant in the shutdown state is carried out at the initial stage of starting the air conditioner, namely before the compressor is not started, so that the air conditioner can be directly protected under the condition of lack of the refrigerant, and the compressor is prevented from being started and operated under the condition of lack of the refrigerant; the method and the device can complement each other by judging the lack of the refrigerant before and after the compressor is started, so that the lack of the refrigerant is protected more quickly and effectively.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of an embodiment of an air conditioner control method according to the present invention;

fig. 2 is a flowchart illustrating an embodiment of determining whether the air conditioner lacks a refrigerant in a shutdown state according to the present invention;

fig. 3 is a flowchart illustrating a specific embodiment of determining whether the air conditioner lacks a refrigerant in an operating state according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of an embodiment of a method for controlling an air conditioner according to the present invention;

fig. 5 is a schematic structural diagram of an embodiment of an air conditioning control device provided in the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The invention provides an air conditioner control method. Fig. 1 is a schematic method diagram of an embodiment of an air conditioner control method provided by the present invention. The method is particularly suitable for the automobile air conditioner and aims at the characteristic that the automobile air conditioner is frequently started and stopped.

As shown in fig. 1, according to an embodiment of the present invention, the air conditioner control method includes at least step S1, step S2, step S3, and step S4.

Step S1, after receiving the air conditioner start-up instruction, determines whether the air conditioner is in a shutdown state and lacks refrigerant.

In one specific embodiment, whether the air conditioner lacks the refrigerant in the shutdown state is judged according to whether the high-pressure saturation temperature of the air conditioner meets the judgment condition for judging the lack of the refrigerant in the shutdown state. The high-pressure saturation temperature is a saturation temperature corresponding to the high pressure of the air conditioner, and the pressure of the high-pressure side of a compressor of the air conditioner, namely the high pressure of the air conditioner, can be detected through a high-pressure sensor; and the judgment condition for judging the lack of the refrigerant in the shutdown state is determined according to the current outdoor environment temperature.

Specifically, the determination condition for determining that the refrigerant is lacking in the shutdown state may specifically be:

Tps≤α*T_{outer ring}-β；

Wherein Tps is a high pressure saturation temperature, T, of the air conditioner_{Outer ring}α and β are coefficients determined according to the temperature interval in which the current outdoor ambient temperature is located in at least two preset temperature intervals, for example, the whole outer-loop working condition is divided into three temperature intervals (∞, T2)](T2, T1) and [ T1, + ∞) ] and corresponding different values of α and β when the outdoor environment temperature is in different temperature ranges.

More specifically, if the high-pressure saturation temperature does not meet the judgment condition for judging that the air conditioner is lack of the refrigerant in the shutdown state, determining that the air conditioner is not lack of the refrigerant in the shutdown state; and if the high-pressure saturation temperature meets the judgment condition for judging that the air conditioner lacks the refrigerant in the shutdown state, determining that the air conditioner lacks the refrigerant in the shutdown state.

Preferably, if the high-pressure saturation temperature meets the judgment condition for judging that the refrigerant is absent in the shutdown state, determining whether the accumulated times of the high-pressure saturation temperature meeting the judgment condition for judging that the refrigerant is absent in the shutdown state reaches preset times; if the accumulated times reach the preset times, determining that the air conditioner lacks refrigerants in a shutdown state; and if the accumulated times do not reach the preset times, starting the compressor to operate for a third preset time, and then stopping the compressor, and judging whether the air conditioner is lack of refrigerant in a stop state again.

In the above embodiment, the judgment of the accumulated number is set to effectively avoid the occurrence of the refrigerant shortage false protection, and if the accumulated number does not reach the preset number, the judgment of the refrigerant shortage in the shutdown state is performed again to further confirm whether the previous judgment is accurate, so that the compressor is pre-started, and is shut down after running for a third predetermined time (for example, 60 seconds), so as to circulate the system refrigerant, and avoid the refrigerant shortage false protection caused by refrigerant migration or pipeline blockage or local detection error of the pressure sensor.

Optionally, before determining whether the air conditioner lacks a refrigerant in the shutdown state according to whether the high-pressure saturation temperature of the air conditioner satisfies a determination condition for determining that the refrigerant lacks in the shutdown state, the method further includes: detecting whether the air conditioner has a sensor fault; detecting whether a high-voltage sensor of the air conditioner fails or not under the condition that the air conditioner is detected to have a sensor failure: if the high-pressure sensor fails, whether the air conditioner is lack of refrigerant in a shutdown state cannot be judged, whether the air conditioner is lack of refrigerant in the shutdown state is not judged, and a compressor of the air conditioner is started; and if the high-pressure sensor fails, judging whether the air conditioner lacks a refrigerant in a shutdown state according to whether the high-pressure saturation temperature of the air conditioner is less than or equal to a preset temperature value. If the high-pressure saturation temperature is less than or equal to the preset temperature value, determining that the air conditioner lacks a refrigerant in a shutdown state; and if the high-pressure saturation temperature is greater than the preset temperature value, determining that the air conditioner does not lack a refrigerant in a shutdown state.

Fig. 2 is a flowchart illustrating an embodiment of determining whether the air conditioner lacks a refrigerant in a shutdown state according to the present invention. As shown in fig. 2, the process of determining whether the air conditioner is in a shutdown state and lacks a refrigerant specifically includes steps S201 to S215.

The judgment process is based on that when the air conditioner is stopped, the high-pressure saturation temperature Tps can approach the roomOutside ambient temperature T_{Outer ring}So that T at that time is detected and compared_{Outer ring}And Tps can determine whether the air conditioner lacks a refrigerant.

Step S201, the air conditioner is powered on and receives an air conditioner start signal. Upon receiving the power-on signal, the process first proceeds to step S202.

In step S202, the sensor self-test determines whether there is a sensor failure, and if there is a sensor failure, the process proceeds to step S210, and if it is determined that there is no sensor failure, the process proceeds to step S203.

Step S203, collecting the outdoor environment temperature T outer ring and the high pressure saturation temperature Tps, and then determining the judgment condition of lack of refrigerant in the shutdown state according to the temperature sections of the outdoor environment temperature T outer ring in three temperature sections (— infinity, T2], (T2, T1), [ T1, + ∞).

In step S204, it is determined whether T outer ring ≧ T1 is satisfied, if yes, step S205 is executed, and if no, step S206 is executed.

In step S205, it is determined whether Tps and the T outer ring satisfy the first determination condition of refrigerant shortage in the shutdown state corresponding to the [ T1, + ∞ ] temperature range, if yes, step S209 is executed, and if no, it is determined that refrigerant is not in shortage, step S212 is executed.

In step S206, if the T outer ring is not equal to or greater than T1, it is determined whether T2 < T outer ring < T1 is satisfied, if yes, step S207 is executed, and if no, step S208 is executed.

Step S207, determining whether Tps and T outer ring satisfy a second determination condition of refrigerant shortage in the shutdown state corresponding to the temperature interval (T2, T1), if yes, executing step S209, otherwise, indicating that refrigerant is not to be lacked, and executing step S212.

In step S208, if T2 < T outer ring < T1 is not satisfied, which indicates that T outer ring < T2 is satisfied, it is determined whether Tps and T outer ring satisfy the third determination condition for refrigerant shortage in the shutdown state corresponding to the (— ∞, T2) temperature range, if yes, step S209 is executed, and if no, it indicates that refrigerant is not in shortage, step S212 is executed.

In step S209, if it is determined that the determination condition for refrigerant shortage in the shutdown state is satisfied, the cumulative number of times of refrigerant shortage determination is increased by 1, and the process proceeds to step S213.

In step S210, if it is determined that the sensor has no failure, it is detected whether the high-voltage sensor has a failure, and if not, the process proceeds to step S211, and if so, the process proceeds to step S215.

Step S211, if the high-voltage sensor has no fault, judging whether the high-voltage saturation temperature Tps meets the condition that Tps is less than or equal to T3, if so, entering step S215, and if not, entering step S212.

And step S212, starting normal operation of the compressor until the air conditioner finishes operation.

In step S213, it is determined whether the number of times of determination of the cumulative refrigerant shortage reaches n times (for example, 3 times), and if not, the process proceeds to step S214, and if so, the process proceeds to step S215.

Step S214, if the cumulative refrigerant lack determination frequency does not reach n times, in order to further confirm whether the previous determination is accurate, the compressor is pre-started and is stopped after running for X seconds (for example, 60 seconds), the step S202 is returned again to judge whether the refrigerant lack in the stop state is carried out again, so that the system refrigerant is circulated, the fluorine lack error protection caused by refrigerant migration or pipeline blockage or local detection errors of the pressure sensor is avoided, the compressor is stopped after X seconds, the determination on the refrigerant lack in the stop state is carried out again, and the cumulative refrigerant lack determination frequency is cleared after the air conditioner is powered off according to the circulation.

In step S215, the compressor is prohibited from starting, and the refrigerant shortage flag is displayed.

Therefore, the judgment of whether the air conditioner is in the shutdown state and lacks of the refrigerant is completed.

And step S2, if the air conditioner is judged not to lack refrigerant in the shutdown state, starting a compressor of the air conditioner.

Specifically, when the air conditioner is judged not to lack a refrigerant in a shutdown state, the compressor of the air conditioner can be normally started. And if the air conditioner is judged to lack refrigerant in the shutdown state, forbidding starting of a compressor of the air conditioner, and/or displaying a refrigerant lack prompt message, such as displaying a refrigerant lack sign.

And step S3, after the compressor of the air conditioner is started, judging whether the air conditioner is lack of refrigerant in the running state.

In one specific embodiment, whether the air conditioner lacks the refrigerant in the operating state is judged according to whether the high-pressure saturation temperature of the air conditioner, the temperature of the indoor and outdoor heat exchangers and/or the indoor and outdoor ambient temperatures meet the judgment condition for judging that the refrigerant in the operating state is lacking.

The determination condition for determining that the operating state lacks the refrigerant may specifically include: a determination condition corresponding to the cooling mode and/or a determination condition corresponding to the heating mode. The determination condition corresponding to the cooling mode may specifically include a first cooling refrigerant shortage determination condition based on an indoor ambient temperature and a temperature of an indoor heat exchanger of the air conditioner; a second refrigeration refrigerant shortage determination condition based on the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger of the air conditioner; and/or a third refrigeration refrigerant shortage determination condition based on the outdoor ambient temperature and the high pressure saturation temperature of the air conditioner; the determination condition corresponding to the heating mode may specifically include a first heating refrigerant shortage determination condition based on an outdoor ambient temperature and an outdoor heat exchanger temperature of the air conditioner; a second heating refrigerant shortage determination condition based on the outdoor heat exchanger temperature and the indoor heat exchanger temperature of the air conditioner; and/or a third heating refrigerant shortage determination condition based on the temperature of the indoor heat exchanger of the air conditioner and the high-pressure saturation temperature.

In one embodiment, the first refrigerant shortage determination condition based on an indoor ambient temperature and an indoor heat exchanger temperature of the air conditioner among the determination conditions corresponding to the cooling mode includes: t is_{Inner ring}-T_{Inner pipe}A is less than or equal to 1; the second refrigeration refrigerant shortage determination condition based on the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger of the air conditioner comprises the following steps: t is_{Outer tube}-T_{Inner pipe}A is less than or equal to 2; and/or, a third refrigeration refrigerant shortage determination condition based on the outdoor environment temperature and the high pressure saturation temperature of the air conditioner includes: Tps-T_{Outer ring}A is less than or equal to 3; among the determination conditions corresponding to the heating mode, a first heating refrigerant shortage determination condition based on an outdoor ambient temperature and an outdoor heat exchanger temperature of the air conditioner includes: t is_{Outer ring}-T_{Outer tube}B1 is less than or equal to B; the second heating refrigerant shortage determination condition based on the outdoor heat exchanger temperature and the indoor heat exchanger temperature of the air conditioner includes: t is_{Inner pipe}-T_{Outer tube}B2 is less than or equal to B; andand/or the third heating refrigerant shortage judgment condition based on the temperature of the indoor heat exchanger of the air conditioner and the high-pressure saturation temperature comprises the following steps: Tps-T_{Inner pipe}B3 is less than or equal to B. Wherein Tps is a high pressure saturation temperature, T, of the air conditioner_{Outer ring}Is the current outdoor ambient temperature, T_{Inner ring}Is the current indoor ambient temperature, T_{Inner pipe}Is the temperature, T, of the indoor heat exchanger_{Outer tube}Is the outdoor heat exchanger temperature; a1, a2, A3 are refrigeration determination parameters, B1, B2, B3 are heating determination parameters, and may be specifically set according to actual conditions and/or experimental verification, for example, according to actual conditions of an air conditioning system and empirical values verified by a large number of experiments.

If the high-pressure saturation temperature of the air conditioner, the temperature of the indoor and outdoor heat exchanger and/or the indoor and outdoor environment temperature do not meet the judgment condition for judging that the air conditioner is lack of the refrigerant in the running state, determining that the air conditioner is not lack of the refrigerant in the running state; and if the high-pressure saturation temperature, the temperature of the indoor and outdoor heat exchangers and/or the indoor and outdoor ambient temperatures of the air conditioner meet the judgment condition for judging that the air conditioner lacks the refrigerant in the running state, determining that the air conditioner lacks the refrigerant in the running state.

Preferably, if the high-pressure saturation temperature of the air conditioner, the temperature of the indoor and outdoor heat exchangers and/or the indoor and outdoor ambient temperatures meet the judgment condition for judging that the operating state lacks the refrigerant, judging whether the duration time of the judgment condition for judging that the operating state lacks the refrigerant is greater than or equal to a second preset time; and if the duration time is greater than or equal to the second preset time, determining that the air conditioner is lack of refrigerant in the running state.

Preferably, after the compressor is started to operate for a first predetermined time, whether the air conditioner is lack of refrigerant in an operating state is judged. Specifically, the system is unstable at the initial stage of starting the air conditioner, and each parameter may fluctuate greatly, which is not suitable for detecting the refrigerant shortage parameter at this time, and the waiting time for determining whether the air conditioner is in the operation state and lacks the refrigerant may be set after the compressor is started, for example, the determination of whether the air conditioner is in the operation state and lacks the refrigerant may be started Y seconds (for example, 300 seconds) after the compressor is started.

Preferably, before determining whether the air conditioner runs short of refrigerant, the method further includes: detecting whether the air conditioner has a sensor fault; judging whether the air conditioner lacks a refrigerant in the running state or not under the condition that the fault of the sensor of the air conditioner is not detected; and if the air conditioner is detected to have a sensor fault, judging whether the air conditioner is lack of refrigerant in the running state or not.

Fig. 3 is a flowchart illustrating an embodiment of determining whether the air conditioner lacks a refrigerant in an operating state according to the present invention. As shown in fig. 3, the process of determining whether the air conditioner runs short of refrigerant includes steps S301 to S315.

The whole process requires that the air conditioner has a high-pressure sensor (detecting high pressure Phigh, which corresponds to saturation temperature expressed as Tps), an inner ring temperature sensor (detecting indoor ambient temperature Tinner ring), an outer ring temperature sensor (detecting outdoor ambient temperature Touter ring), an inner tube temperature sensor (detecting indoor heat exchanger temperature Tinner tube), and an outer tube temperature sensor (detecting outdoor heat exchanger temperature Touter tube).

Step S301, after the compressor is started, whether the running time meets t1 being more than or equal to Y seconds (first preset time) is judged, if yes, the step S302 is executed, and if not, the step S315 is executed.

Step S302 detects whether the sensor has a failure, and if the sensor has no failure, the process proceeds to step S303, and if the sensor has a failure, the process proceeds to step S315.

Step S303, detecting whether the air conditioner is in the cooling mode currently, if so, going to step 304, and if not, going to step S308.

Step S304, if the air conditioner is in the cooling mode at present, detecting the high-pressure saturation temperature Tps of the air conditioner, the outdoor heat exchanger temperature Touter tube, the indoor heat exchanger temperature Tinner tube, the indoor environment temperature Tinner ring and the outdoor environment temperature Touter ring, and executing the steps S305 to S306.

Step S305, determining whether the T inner ring and the T inner tube satisfy the corresponding first refrigerant shortage determination condition, if yes, proceeding to step S306, otherwise, returning to step S303.

And step S306, judging whether the T outer pipe and the T inner pipe meet corresponding second refrigeration refrigerant shortage judgment conditions, if so, entering step S307, and if not, returning to step S303.

Step S307, determining whether the T outer ring and Tps meet corresponding third refrigeration refrigerant shortage determination conditions, if yes, proceeding to step S313, if no, returning to step S303.

Step S308, if the air conditioner is not in the cooling mode, detecting whether the air conditioner is in the heating mode, if so, entering step S309, otherwise, entering step S315.

Step S309, if the air conditioner is in the heating mode currently, detecting the high-pressure saturation temperature Tps of the air conditioner, the outdoor heat exchanger temperature Touter tube, the indoor heat exchanger temperature Tinner tube, the indoor environment temperature Tinner ring and the outdoor environment temperature Touter ring, and executing the steps S310 to S312.

Step S310, determining whether the T outer ring and the T outer tube satisfy the corresponding first heating refrigerant shortage determination condition, if yes, going to step S311, otherwise, returning to step S303.

Step S311, it is determined whether the T outer tube and the T inner tube satisfy the corresponding second heating refrigerant shortage determination condition, if yes, the process proceeds to step S312, and if not, the process returns to step S303.

Step S312, it is determined whether or not the T-inner tube and Tps satisfy the corresponding third heating refrigerant shortage determination condition, if yes, the process proceeds to step S313, and if not, the process returns to step S303.

In step S313, if the cooling-refrigerant-shortage determination conditions corresponding to the three cooling modes are satisfied in the cooling mode at the same time, or the heating-refrigerant-shortage determination conditions corresponding to the three heating modes are satisfied in the heating mode at the same time, it is determined whether the time at which the determination conditions are satisfied is t2 ≧ Z seconds (second predetermined time), and if so, the routine proceeds to step S314.

And step S314, stopping the compressor and displaying the sign of lack of refrigerant.

And step S315, the judgment of lack of refrigerant is not carried out, and the air conditioner normally operates.

In the step S301, a waiting time for performing the refrigerant shortage determination in the operating state after the compressor is started is set, that is, the determination that the refrigerant shortage in the operating state starts to be determined Y seconds (for example, 300 seconds) after the compressor is started; since the detection of the sensor failure is prioritized in step S302, since the detection parameters involved in the determination of the operating state lack of refrigerant are large, the process proceeds to step 315 as long as the sensor failure occurs in step S302, and the determination of the operating state lack of refrigerant is not performed. If the sensor has no fault, the judgment of the lack of the refrigerant in the running state is respectively carried out in the refrigerating mode and the heating mode, and in the air supply mode, the compressor does not run, the detection parameter of the refrigerant does not change, and the judgment of the lack of the refrigerant in the running state is not carried out. In the cooling mode, detecting a high-pressure saturation temperature Tps, an indoor environment temperature T inner ring, an outdoor environment temperature T outer ring, an indoor heat exchanger temperature T inner tube and an outdoor heat exchanger temperature T outer tube in step S304; the determination is performed in steps S305, S306, and S307 according to corresponding determination conditions, in order to avoid that the use experience of a user is affected due to the stop of the compressor caused by the refrigerant shortage false protection, the step 313 can be entered only if three determination conditions of steps S305, S306, and S307 are simultaneously satisfied, and the step 313 cannot be entered if one determination condition is not satisfied; when the three determination conditions are simultaneously satisfied, the timer is automatically started, and in step 313, it is determined whether the time t2 continuously satisfying the three determination conditions is equal to Z seconds, and if any determination condition is not satisfied in the process of timing less than Z seconds, the timer is cleared. Similarly, in the heating mode, it is also necessary to determine whether or not the respective determination conditions are simultaneously satisfied in steps S310, S311, and S312, and the time required to continuously satisfy the three determination conditions reaches Z seconds. When the determination condition is continuously satisfied and the duration reaches Z seconds in step 313, it is determined that the air conditioning system is out of refrigerant, and the process proceeds to step 314 where the compressor is stopped and a refrigerant out flag is sent. After the refrigerant lack mark is displayed, the refrigerant lack mark can be cleared only by restarting the air conditioner after the power off.

And step S4, if the air conditioner is judged to lack refrigerant in the running state, stopping the running of the compressor.

Specifically, if the air conditioner is judged to lack refrigerant in the running state, the running of a compressor of the air conditioner is stopped. Furthermore, a refrigerant shortage prompt message, such as a refrigerant shortage flag, may also be displayed. And if the air conditioner is judged not to lack the refrigerant in the running state, the compressor continues to run normally.

For clearly explaining the technical solution of the present invention, the following describes an execution flow of the air conditioner control method provided by the present invention with a specific embodiment.

Fig. 4 is a schematic method diagram of an embodiment of an air conditioner control method according to the present invention. The embodiment shown in fig. 4 includes steps S101 to S107.

According to the embodiment, the whole process comprises two stages of shutdown fluorine-deficient protection and operation fluorine-deficient protection, the whole air conditioner operation process is basically covered, the two detection methods supplement each other, and the safety of an air conditioner system is guaranteed to the maximum extent.

Step S101, after receiving a starting command, before starting the compressor, firstly, judging whether the compressor is in a shutdown state and lacks refrigerant, namely, judging whether the compressor is in a shutdown state and lacks refrigerant, if the compressor is judged to lack refrigerant protection, directly entering step S104, and if the compressor is judged not to lack refrigerant protection, entering step S102.

Step S102, if the compressor is judged to be out of operation and lack of refrigerant protection, the compressor is started to operate, and the operation lack of refrigerant protection judgment is carried out in the operation process of the compressor, namely whether the operation state lacks refrigerant is judged; if the refrigerant shortage protection is judged, the step S104 is directly carried out, otherwise, the step is returned to carry out the judgment again. The step is a continuous judging process in the whole air conditioner running process until the air conditioner is turned off.

And step S103, if the operation lack of refrigerant protection is judged not to exist, the compressor normally operates.

And step S104, if the compressor is judged to be lack of refrigerant in the shutdown state or in the running state, the compressor is forbidden to start running, and a refrigerant lack mark is sent to the display panel for displaying.

Step S105, judging whether the air conditioning system is powered off, if so, entering step S106, and if not, entering step S107.

And step S106, if the air conditioning system is powered off, clearing the refrigerant shortage mark.

And step S107, if the air conditioning system is not powered off, the refrigerant lack mark is kept displayed.

The invention provides an air conditioner control device. Fig. 5 is a schematic structural diagram of an embodiment of an air conditioning control device provided in the present invention. The method is particularly suitable for the automobile air conditioner and aims at the characteristic that the automobile air conditioner is frequently started and stopped.

As shown in fig. 5, the air conditioning control apparatus 100 includes: a judging unit 110 and a control unit 120.

The judging unit 110 is configured to judge whether the air conditioner lacks a refrigerant in a shutdown state after receiving an air conditioner startup instruction; the control unit 120 is configured to start a compressor of the air conditioner if the determining unit determines that the air conditioner is in a shutdown state and does not lack a refrigerant; the determining unit 110 is further configured to determine whether the air conditioner runs short of refrigerant after the control unit 120 starts a compressor of the air conditioner; the control unit 120 is further configured to stop the operation of the compressor if the determining unit determines that the air conditioner lacks a refrigerant in the operation state.

The determination unit 110 determines whether the air conditioner is in a shutdown state and lacks a refrigerant.

In one specific embodiment, whether the air conditioner lacks the refrigerant in the shutdown state is judged according to whether the high-pressure saturation temperature of the air conditioner meets the judgment condition for judging the lack of the refrigerant in the shutdown state.

And the judgment condition for judging the lack of the refrigerant in the shutdown state is determined according to the current outdoor environment temperature. The determination condition for determining that the refrigerant is lacking in the shutdown state may specifically be:

Tps≤α*T_{outer ring}-β；

Wherein Tps is a high pressure saturation temperature, T, of the air conditioner_{Outer ring}α and β are coefficients determined according to the temperature interval in which the current outdoor environment temperature is located in at least two preset temperature intervals, for example, the whole outer-loop working condition is divided into three temperature intervals (∞, T2)](T2, T1) and [ T1, + ∞) ] and corresponding different values of α and β when the outdoor environment temperature is in different temperature ranges.

More specifically, if the high-pressure saturation temperature does not satisfy the condition for determining lack of refrigerant in the shutdown state, the determining unit 110 determines that the air conditioner does not lack refrigerant in the shutdown state; if the high-pressure saturation temperature meets the determination condition for determining that the air conditioner is in the shutdown state and lacks the refrigerant, the determination unit 110 determines that the air conditioner is in the shutdown state and lacks the refrigerant.

Preferably, if the high-pressure saturation temperature meets the judgment condition for judging that the refrigerant is absent in the shutdown state, determining whether the accumulated times of the high-pressure saturation temperature meeting the judgment condition for judging that the refrigerant is absent in the shutdown state reaches preset times; if the accumulated number of times reaches the preset number of times, the judgment unit 110 determines that the air conditioner lacks a refrigerant in a shutdown state; if the accumulated times does not reach the preset times, the control unit 120 starts the compressor to operate for a third preset time and then stops, and the judgment unit 120 judges whether the air conditioner is lack of refrigerant in the stop state again.

Optionally, the apparatus 100 further comprises: a first detection unit and/or a second detection unit.

The first detection unit is used for detecting whether the air conditioner has a sensor fault before the judgment unit judges whether the air conditioner lacks the refrigerant in the shutdown state according to whether the high-pressure saturation temperature of the air conditioner meets the judgment condition for judging that the refrigerant in the shutdown state lacks the refrigerant; a second detection unit for detecting whether a high-pressure sensor of the air conditioner is out of order or not when the first detection unit detects that the air conditioner has a sensor failure: the judging unit is further configured to: if the second detection unit detects that the high-pressure sensor fails, whether the air conditioner is short of refrigerant in a shutdown state is not judged, and a compressor of the air conditioner is started; if the second detection unit detects that the high-pressure sensor does not break down, whether the air conditioner is in a shutdown state and lacks a refrigerant is judged according to whether the high-pressure saturation temperature of the air conditioner is smaller than or equal to a preset temperature value. If the high-pressure saturation temperature is less than or equal to the preset temperature value, determining that the air conditioner lacks a refrigerant in a shutdown state; and if the high-pressure saturation temperature is greater than the preset temperature value, determining that the air conditioner does not lack a refrigerant in a shutdown state.

The determination unit 110 determines whether the air conditioner lacks a refrigerant in an operation state.

In one embodiment, the determining unit 110 determines whether the air conditioner lacks a refrigerant in the operating state according to whether the high pressure saturation temperature of the air conditioner, the temperature of the indoor and outdoor heat exchangers, and/or the indoor and outdoor ambient temperatures meet a determination condition for determining that the operating state lacks a refrigerant.

The judgment condition for judging the lack of the refrigerant in the running state comprises the following steps: a determination condition corresponding to a cooling mode and/or a determination condition corresponding to a heating mode; the judgment condition corresponding to the cooling mode includes: a first refrigeration refrigerant shortage determination condition based on an indoor ambient temperature and a temperature of an indoor heat exchanger of the air conditioner; a second refrigeration refrigerant shortage determination condition based on the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger of the air conditioner; and/or a third refrigeration refrigerant shortage determination condition based on the outdoor ambient temperature and the high pressure saturation temperature of the air conditioner; and/or the judgment condition corresponding to the heating mode comprises the following steps: a first heating refrigerant shortage determination condition based on an outdoor ambient temperature and a temperature of an outdoor heat exchanger of the air conditioner; a second heating refrigerant shortage determination condition based on the outdoor heat exchanger temperature and the indoor heat exchanger temperature of the air conditioner; and/or a third heating refrigerant shortage determination condition based on the temperature of the indoor heat exchanger of the air conditioner and the high-pressure saturation temperature.

In one embodiment, the first refrigerant shortage determination condition based on an indoor ambient temperature and an indoor heat exchanger temperature of the air conditioner among the determination conditions corresponding to the cooling mode includes: t is_{Inner ring}-T_{Inner pipe}A is less than or equal to 1; indoor heat exchanger temperature and outdoor heat exchange based on air conditionerThe second refrigeration refrigerant shortage judgment condition of the temperature of the refrigerator comprises the following steps: t is_{Outer tube}-T_{Inner pipe}A is less than or equal to 2; and/or, a third refrigeration refrigerant shortage determination condition based on the outdoor environment temperature and the high pressure saturation temperature of the air conditioner includes: Tps-T_{Outer ring}A is less than or equal to 3; among the determination conditions corresponding to the heating mode, a first heating refrigerant shortage determination condition based on an outdoor ambient temperature and an outdoor heat exchanger temperature of the air conditioner includes: t is_{Outer ring}-T_{Outer tube}B1 is less than or equal to B; the second heating refrigerant shortage determination condition based on the outdoor heat exchanger temperature and the indoor heat exchanger temperature of the air conditioner includes: t is_{Inner pipe}-T_{Outer tube}B2 is less than or equal to B; and/or, a third heating refrigerant shortage determination condition based on the temperature of the indoor heat exchanger of the air conditioner and the high-pressure saturation temperature includes: Tps-T_{Inner pipe}B3 is less than or equal to B. Wherein Tps is a high pressure saturation temperature, T, of the air conditioner_{Outer ring}Is the current outdoor ambient temperature, T_{Inner ring}Is the current indoor ambient temperature, T_{Inner pipe}Is the temperature, T, of the indoor heat exchanger_{Outer tube}Is the outdoor heat exchanger temperature; a1, a2, A3 are refrigeration determination parameters, B1, B2, B3 are heating determination parameters, and may be specifically set according to actual conditions and/or experimental verification, for example, according to actual conditions of an air conditioning system and empirical values verified by a large number of experiments.

The determining unit 110 determines whether the air conditioner lacks a refrigerant in the operating state according to whether the high-pressure saturation temperature of the air conditioner, the temperature of the indoor and outdoor heat exchangers, and/or the indoor and outdoor ambient temperatures meet a determination condition for determining whether the refrigerant in the operating state is lacking, including: if the high-pressure saturation temperature, the temperature of the indoor and outdoor heat exchangers and/or the indoor and outdoor ambient temperatures of the air conditioner meet the judgment condition for judging that the air conditioner lacks the refrigerant in the running state, determining that the air conditioner lacks the refrigerant in the running state; and/or if the high-pressure saturation temperature of the air conditioner, the temperature of the indoor and outdoor heat exchanger and/or the indoor and outdoor ambient temperatures meet the judgment condition for judging that the running state lacks the refrigerant, judging whether the duration time of the judgment condition for judging that the running state lacks the refrigerant is more than or equal to second preset time; and if the duration time is greater than or equal to the second preset time, determining that the air conditioner is lack of refrigerant in the running state.

Preferably, the judging unit judges whether the air conditioner lacks a refrigerant in an operating state after the compressor starts to operate for a first predetermined time. Specifically, the system is unstable at the initial stage of starting the air conditioner, and each parameter may fluctuate greatly, which is not suitable for detecting the refrigerant shortage parameter at this time, and the waiting time for determining whether the air conditioner is in the operation state and lacks the refrigerant may be set after the compressor is started, for example, the determination of whether the air conditioner is in the operation state and lacks the refrigerant may be started Y seconds (for example, 300 seconds) after the compressor is started.

Preferably, the apparatus 100 further comprises a third detection unit (not shown). The third detection unit is used for detecting whether the air conditioner has a sensor fault before the judgment unit judges whether the air conditioner is lack of refrigerant in the running state; the determining unit 120 determines whether the air conditioner lacks a refrigerant in an operating state when the third detecting unit does not detect that the air conditioner has a sensor fault; and if the third detection unit detects that the air conditioner has a sensor fault, the third detection unit does not judge whether the air conditioner is lack of refrigerant in the running state.

The control unit 120 is further configured to prohibit starting of the compressor of the air conditioner if the determining unit 120 determines that the air conditioner lacks the refrigerant in the shutdown state, and/or maintain normal operation of the compressor if the determining unit 120 determines that the air conditioner lacks the refrigerant in the operating state.

Optionally, based on the above embodiment, the apparatus 100 further includes: a display unit. The display unit is configured to display a refrigerant shortage prompt message if the determination unit 110 determines that the air conditioner is in a shutdown state and lacks refrigerant or the air conditioner is in an operating state and lacks refrigerant.

The present invention also provides a storage medium corresponding to the air conditioning control method, having a computer program stored thereon, which when executed by a processor, performs the steps of any of the aforementioned methods.

The invention also provides an air conditioner corresponding to the air conditioner control method, which comprises a processor, a memory and a computer program which is stored on the memory and can run on the processor, wherein the processor realizes the steps of any one of the methods when executing the program.

The invention also provides an air conditioner corresponding to the air conditioner control device, which comprises the air conditioner control device.

Therefore, according to the scheme provided by the invention, the judgment of the lack of the refrigerant in the shutdown state is carried out at the initial stage of the start of the air conditioner, namely before the compressor is not started, the direct protection can be carried out under the condition of the lack of the refrigerant, and the start operation of the compressor is prevented under the condition of the lack of the refrigerant; the method and the device can complement each other by judging the lack of the refrigerant before and after the compressor is started, so that the lack of the refrigerant is protected more quickly and effectively.

The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope and spirit of the invention and the following claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or a combination of any of these. In addition, each functional unit may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.

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

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.

The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An air conditioner control method, comprising:

after receiving an air conditioner starting instruction, judging whether the air conditioner is lack of a refrigerant in a shutdown state;

if the air conditioner is judged not to lack the refrigerant in the shutdown state, starting a compressor of the air conditioner;

after a compressor of the air conditioner is started, judging whether the air conditioner is lack of a refrigerant in an operation state;

if the air conditioner is judged to lack the refrigerant in the running state, stopping the running of the compressor;

judging whether the air conditioner lacks the refrigerant in the shutdown state includes:

judging whether the air conditioner lacks a refrigerant in the shutdown state or not according to whether the high-pressure saturation temperature of the air conditioner meets the judgment condition for judging that the refrigerant is lacked in the shutdown state or not;

the judgment condition for judging the lack of the refrigerant in the shutdown state is determined according to the current outdoor environment temperature;

the judgment condition for judging the lack of refrigerant in the shutdown state comprises that Tps is less than or equal to α T_{Outer ring}-β；

Wherein Tps is a high pressure saturation temperature, T, of the air conditioner_{Outer ring}α and β are coefficients determined according to a temperature interval in which the current outdoor environment temperature is located in at least two preset temperature intervals.

2. The method as claimed in claim 1, wherein before determining whether the air conditioner is out of refrigerant in the shutdown state according to whether the high pressure saturation temperature of the air conditioner satisfies a determination condition for determining that the air conditioner is out of refrigerant in the shutdown state, the method further comprises:

detecting whether the air conditioner has a sensor fault;

detecting whether a high-voltage sensor of the air conditioner fails or not under the condition that the air conditioner is detected to have a sensor failure:

if the high-pressure sensor fails, judging whether the air conditioner is short of refrigerant in a shutdown state or not, and starting a compressor of the air conditioner;

if the high-pressure sensor fails, judging whether the air conditioner is lack of refrigerant in a shutdown state or not according to whether the high-pressure saturation temperature of the air conditioner is less than or equal to a preset temperature value or not;

if the high-pressure saturation temperature is less than or equal to the preset temperature value, determining that the air conditioner lacks a refrigerant in a shutdown state; and if the high-pressure saturation temperature is greater than the preset temperature value, determining that the air conditioner does not lack a refrigerant in a shutdown state.

3. The method as claimed in any one of claims 1-2, wherein determining whether the air conditioner lacks refrigerant in the shutdown state according to whether the high pressure saturation temperature of the air conditioner satisfies a determination condition for determining that refrigerant is lacking in the shutdown state comprises:

if the high-pressure saturation temperature does not meet the judgment condition for judging that the air conditioner is lack of the refrigerant in the shutdown state, determining that the air conditioner is not lack of the refrigerant in the shutdown state;

and/or the presence of a gas in the gas,

if the high-pressure saturation temperature meets the judgment condition for judging that the air conditioner lacks the refrigerant in the shutdown state, determining that the air conditioner lacks the refrigerant in the shutdown state,

and/or the presence of a gas in the gas,

if the high-pressure saturation temperature meets the judgment condition for judging that the refrigerant is absent in the shutdown state, determining whether the accumulated times of the judgment condition for judging that the refrigerant is absent in the shutdown state is met by the high-pressure saturation temperature reaches the preset times;

if the accumulated times reach the preset times, determining that the air conditioner lacks refrigerants in a shutdown state;

and if the accumulated times do not reach the preset times, starting the compressor to operate for a third preset time, and then stopping the compressor, and judging whether the air conditioner is lack of refrigerant in a stop state again.

4. The method according to any one of claims 1-2, wherein determining whether the air conditioner is out of refrigerant in an operating state comprises:

and judging whether the air conditioner lacks the refrigerant in the running state or not according to whether the high-pressure saturation temperature of the air conditioner, the temperature of the indoor and outdoor heat exchangers and/or the indoor and outdoor environment temperature meet the judgment condition for judging whether the running state lacks the refrigerant.

5. The method as claimed in claim 4, wherein the determining conditions for determining the refrigerant shortage in the operation state comprise: a determination condition corresponding to a cooling mode and/or a determination condition corresponding to a heating mode;

the judgment condition corresponding to the cooling mode includes:

a first refrigeration refrigerant shortage determination condition based on an indoor ambient temperature and a temperature of an indoor heat exchanger of the air conditioner;

a second refrigeration refrigerant shortage determination condition based on the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger of the air conditioner; and/or the presence of a gas in the gas,

a third refrigeration refrigerant shortage determination condition based on the outdoor ambient temperature and the high-pressure saturation temperature of the air conditioner;

and/or the presence of a gas in the gas,

the determination condition corresponding to the heating mode includes:

a first heating refrigerant shortage determination condition based on an outdoor ambient temperature and a temperature of an outdoor heat exchanger of the air conditioner;

a second heating refrigerant shortage determination condition based on the outdoor heat exchanger temperature and the indoor heat exchanger temperature of the air conditioner; and/or the presence of a gas in the gas,

and a third heating refrigerant shortage determination condition based on the temperature of the indoor heat exchanger of the air conditioner and the high-pressure saturation temperature.

6. The method as claimed in any one of claims 1 to 2, wherein determining whether the air conditioner is out of refrigerant in the operating state according to whether the high pressure saturation temperature of the air conditioner, the temperature of the indoor and outdoor heat exchangers and/or the indoor and outdoor ambient temperatures meet a determination condition for determining that the air conditioner is out of refrigerant in the operating state comprises:

if the high-pressure saturation temperature, the temperature of the indoor and outdoor heat exchangers and/or the indoor and outdoor ambient temperatures of the air conditioner meet the judgment condition for judging that the air conditioner lacks the refrigerant in the running state, determining that the air conditioner lacks the refrigerant in the running state;

and/or the presence of a gas in the gas,

if the high-pressure saturation temperature of the air conditioner, the temperature of the indoor and outdoor heat exchanger and/or the indoor and outdoor environment temperature meet the judgment condition for judging that the running state lacks the refrigerant, judging whether the duration time meeting the judgment condition for judging that the running state lacks the refrigerant is greater than or equal to second preset time;

and if the duration time is greater than or equal to the second preset time, determining that the air conditioner is lack of refrigerant in the running state.

7. The method according to any one of claims 1 to 2,

after the compressor is started to operate for a first preset time, judging whether the air conditioner lacks a refrigerant in an operating state;

and/or the presence of a gas in the gas,

before judging whether the air conditioner is lack of refrigerant in the running state, the method further comprises the following steps:

detecting whether the air conditioner has a sensor fault;

judging whether the air conditioner lacks a refrigerant in the running state or not under the condition that the fault of the sensor of the air conditioner is not detected;

and if the air conditioner is detected to have a sensor fault, judging whether the air conditioner is lack of refrigerant in the running state or not.

8. The method of any of claims 1-2, further comprising:

if the air conditioner is judged to lack refrigerant in the shutdown state, the compressor of the air conditioner is forbidden to be started, and/or the prompt message of lack of refrigerant is displayed;

and/or the presence of a gas in the gas,

and if the air conditioner is judged to lack refrigerant in the running state, stopping the normal running of the compressor and/or displaying the prompt information of lack of refrigerant.

9. An air conditioning control device, characterized by comprising:

the judging unit is used for judging whether the air conditioner lacks a refrigerant in a shutdown state after receiving an air conditioner starting instruction;

the control unit is used for starting a compressor of the air conditioner if the judging unit judges that the air conditioner is in a shutdown state and does not lack a refrigerant;

the judging unit is also used for judging whether the air conditioner lacks a refrigerant in the running state after the control unit starts the compressor of the air conditioner;

the control unit is also used for stopping the operation of the compressor if the judging unit judges that the air conditioner lacks a refrigerant in the operation state;

the judging unit judges whether the air conditioner lacks a refrigerant in a shutdown state, and comprises:

10. The apparatus of claim 9, further comprising:

the first detection unit is used for detecting whether the air conditioner has a sensor fault before the judgment unit judges whether the air conditioner lacks the refrigerant in the shutdown state according to whether the high-pressure saturation temperature of the air conditioner meets the judgment condition for judging that the refrigerant in the shutdown state lacks the refrigerant;

a second detection unit for detecting whether a high-pressure sensor of the air conditioner is out of order or not when the first detection unit detects that the air conditioner has a sensor failure:

the judging unit is further configured to: if the second detection unit detects that the high-pressure sensor fails, whether the air conditioner is short of refrigerant in a shutdown state is not judged, and a compressor of the air conditioner is started;

if the second detection unit detects that the high-pressure sensor does not break down, judging whether the air conditioner is in a shutdown state and lacks a refrigerant according to whether the high-pressure saturation temperature of the air conditioner is less than or equal to a preset temperature value;

11. The apparatus according to any one of claims 9 to 10, wherein the determining unit determines whether the air conditioner lacks the refrigerant in the shutdown state according to whether the high pressure saturation temperature of the air conditioner satisfies a determination condition for determining that the refrigerant in the shutdown state lacks the refrigerant, includes:

and/or the presence of a gas in the gas,

12. The apparatus according to any one of claims 9 to 10, wherein the determining unit determines whether the air conditioner is out of refrigerant in an operating state includes:

13. The apparatus as claimed in claim 12, wherein the condition for determining the lack of refrigerant in the operation state comprises: a determination condition corresponding to a cooling mode and/or a determination condition corresponding to a heating mode;

the judgment condition corresponding to the cooling mode includes:

and/or the presence of a gas in the gas,

the determination condition corresponding to the heating mode includes:

14. The apparatus according to any one of claims 9 to 10, wherein the determining unit determines whether the air conditioner is out of refrigerant in the operating state according to whether the high pressure saturation temperature of the air conditioner, the temperature of the indoor and outdoor heat exchangers, and/or the indoor and outdoor ambient temperatures satisfy a determination condition for determining that the operating state is out of refrigerant, includes:

and/or the presence of a gas in the gas,

15. The apparatus according to any one of claims 9 to 10,

the judging unit judges whether the air conditioner lacks a refrigerant in the running state after the compressor is started to run for a first preset time;

and/or the presence of a gas in the gas,

further comprising: the third detection unit is used for detecting whether the air conditioner has a sensor fault before the judgment unit judges whether the air conditioner is lack of refrigerant in the running state;

the judging unit is used for judging whether the air conditioner lacks a refrigerant in the running state or not under the condition that the third detecting unit does not detect that the air conditioner has the sensor fault;

and if the third detection unit detects that the air conditioner has a sensor fault, the third detection unit does not judge whether the air conditioner is lack of refrigerant in the running state.

16. The apparatus according to any one of claims 9 to 10,

the control unit is further configured to: if the judging unit judges that the air conditioner lacks the refrigerant in the shutdown state, the compressor of the air conditioner is forbidden to be started, and/or if the judging unit judges that the air conditioner lacks the refrigerant in the running state, the compressor is stopped to normally run,

and/or the presence of a gas in the gas,

further comprising: and the display unit is used for displaying the refrigerant shortage prompt information if the judging unit judges that the air conditioner lacks the refrigerant in the shutdown state or the air conditioner lacks the refrigerant in the running state.

17. A storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 8.

18. An air conditioner comprising a processor, a memory, and a computer program stored on the memory and operable on the processor, the processor implementing the steps of the method of any one of claims 1-8 when the program is executed by the processor.

19. An air conditioner characterized by comprising the air conditioning control device according to any one of claims 9 to 16.