CN110410937A - Air conditioner self-diagnosis control method, control device and air conditioner - Google Patents

Abstract

The present invention provides an air conditioner self-diagnosis control method, a control device and an air conditioner, which relate to the technical field of air conditioning, including: obtaining the current coil temperature T _steam of an internal unit, the coil temperature T _cold of an external unit, the exhaust pipe temperature T _row and Outdoor ambient temperature T _ring ; according to the temperature T _steam of the internal machine coil, the temperature T _cold of the external machine coil and the temperature T _row of the exhaust pipe, calculate the difference between the degree of superheat T of the exhaust gas and the temperature _difference T _{of the} heat source; The degree of superheat T _of the exhaust gas, the heat source temperature difference T _difference and the outdoor ambient temperature T _ring , calculate the rate of change M _over , M _difference and M _ring ; according to the change rate M _over , M _difference and M _ring , Self-diagnostic control of the current air conditioner. The air conditioner self-diagnosis control method, control device and air conditioner described in the present invention can identify the operating state of the air conditioner through the operating difference of the exhaust superheat and heat source temperature difference feedback system during the operating state of the air conditioner, and the judgment is more accurate.

Description

Air conditioner self-diagnosis control method, control device and air conditioner

technical field

The invention relates to the technical field of air conditioners, in particular to an air conditioner self-diagnosis control method, a control device and an air conditioner.

Background technique

With the operation of the air conditioner, the air conditioner will inevitably be affected by the external environment and the use environment, as well as the reliability of the components, which makes the air conditioner itself and the working effect different.

Existing air conditioners often diagnose whether the performance of the air conditioner can meet the requirements through current and suction and exhaust temperatures, but the detection is not accurate enough.

It can be seen that it is necessary to improve the design of the diagnosis method of the air conditioner.

Contents of the invention

The problem solved by the invention is that the self-diagnosis method of the existing air conditioner is not accurate enough to accurately judge whether the air conditioner can meet the working requirements.

In order to solve the above problems, the present invention provides an air conditioner self-diagnosis control method, including:

Obtain the current internal unit coil temperature T _steam , external unit coil temperature T _cold , exhaust pipe temperature T _row and outdoor ambient temperature T _ring ;

According to the internal unit coil temperature T _steam , the external machine coil temperature T _cold and the exhaust pipe temperature T _exhaust , calculate the difference between the exhaust superheat T and the temperature _difference T _{of the} heat source;

Calculate the rate of change Mover, _Mdifference , and Mring according to the exhaust gas _{superheat Tpass} , the heat source temperature _{difference Tdifference, and} the outdoor ambient temperature _Tring ;

According to the rate of change Mover, _Mdifference and _Mring , self _- diagnosis control is performed on the current air conditioner.

The present invention further distinguishes the operating state of the air conditioner by feeding back the operating difference of the exhaust superheat degree and the temperature difference of the heat source during the operating state of the air conditioner, and the judgment is more accurate.

Optionally, the temperature difference T _difference of the heat source is replaced by the operating pressure ratio of the air conditioner, the rate of change M _{ratio is} calculated, and the current air conditioner is self-diagnosed and controlled in combination with the M _pass and the M _ring .

Optionally, the _Mpass =(Tpass2 _{- Tpass1} )/Δt, the Tpass2 is the exhaust _superheat at the time _t2 , and the Tpass1 is the exhaust _superheat at the time _t1 . heat;

The M _difference =(T _{difference 2} -T _{difference 1} )/Δt, the T _{difference 2} is the heat source temperature difference at _t2 , and the T _{difference 1} is the heat source temperature difference at _t1 moment;

Described M _ring =(T _{ring 2} -T _{ring 1} )/Δt, described T _{ring 2} is the ambient temperature outside the air conditioner room at _t2 , and described T _{ring 1} is the air conditioner room outside environment at _t1 time temperature;

The Δt is the time difference between time _t2 and time _t1 .

Optionally, the Δt is in the range of 1-30 seconds.

Optionally, when the air conditioner is running in cooling mode, if any of the following conditions is met, the self-diagnosis result indicates that the air conditioner is operating normally, and if any of the above conditions is not met, the self-diagnosis result indicates that the air conditioner is operating abnormally:

The M _excess is greater than zero and the M _{difference is} greater than or equal to zero and the M _ring is greater than zero;

Or, said M is less than or equal _to zero and said M _{difference is} greater than zero and said M _ring is greater than zero;

Or, said M is less than or equal _to zero and said M _{difference is} equal to zero and said M _ring is greater than or equal to zero;

Or, said M is _over equal to zero and said M _{difference is} less than zero and said M _ring is less than zero;

Or, the M _cross is less than zero, the M _{difference is} less than zero, and the M _loop is less than or equal to zero.

Optionally, when the air conditioner is running in the cooling mode, if the following conditions are _met , the self-diagnosis result indicates that the air conditioner is operating normally, and continue to judge whether the _flow rate has increased. Compressor frequency, if the _superheat T is not lowered, continue to increase the flow rate:

The M _excess is greater than zero and the M _{difference is} greater than zero and the M _loop is greater than zero.

Optionally, when the air conditioner is running in cooling mode, if the following conditions are met, the self-diagnosis result indicates that the air conditioner is operating normally, and continue to judge whether _{the superheat} T is increased, and if yes, increase the flow rate:

The M _excess is greater than zero and the M _{difference is} equal to zero and the M _ring is greater than zero.

Optionally, when the air conditioner is running in cooling mode, if the following conditions are met, the self-diagnosis result indicates that the air conditioner is operating normally, and the flow rate and compressor frequency are increased:

The M _over equals to zero and the M _{difference is} greater than zero and the M _loop is greater than zero.

Optionally, when the air conditioner is running in the cooling mode, if any of the following conditions is met, continue to judge whether the motor speed of the outdoor unit of the air conditioner has dropped. If yes, the self-diagnosis result indicates that the air conditioner is operating normally;

The M is greater than zero and _the M _ring is less than or equal to zero;

Or, said M is less than or equal _to zero and said M _{difference is} greater than zero and said M _ring is less than or equal to zero;

Or, said M is less than or equal _to zero and said M _{difference is} equal to zero and said M _ring is less than zero;

Or, the M _cross is less than zero and the M _{difference is} greater than zero and the M _ring is less than or equal to zero;

Or, said M is _over equal to zero and said M _{difference is} less than zero and said M _{loop is} equal to zero.

Optionally, when the air conditioner is running in cooling mode, if the following conditions are met, the self-diagnosis result is that the air conditioner lacks refrigerant:

The M _{difference is} less than zero and the M _loop is greater than zero.

Optionally, when the air conditioner is running in the heating mode, if any of the following conditions is met, the self-diagnosis result indicates that the air conditioner is operating normally; otherwise, the self-diagnosis result indicates that the air conditioner is operating abnormally:

said M _{difference is} greater than zero and said M _ring is greater than zero;

Or, said M is greater _than zero and said M _is less than zero;

Or, said M _excess is greater than zero and said M _{difference is} equal to zero and said M _ring is greater than zero;

Or, said M is less than or equal _to equal and said M _{difference is} equal to zero and said M _ring is greater than or equal to zero;

Or, said M is less than or equal _to zero and said M _{difference is} less than zero and said M _ring is less than zero;

Or, the M _cross is less than zero and the M _{difference is} less than or equal to zero and the M _{ring is} equal to zero;

Or, said M is equal _to zero and said M _{difference is} equal to zero and said M _ring is greater than or equal to zero;

Or, said M _cross is less than zero and said M _{difference is} equal to zero and said M _loop is greater than zero.

Optionally, when the air conditioner is running in the heating mode, if the following conditions are met, the self-diagnosis result indicates that the air conditioner is operating normally, and the frequency of the compressor will continue to be controlled to increase:

The M _excess is greater than or equal to zero and the M _{difference is} greater than zero and the M _loop is greater than zero.

Optionally, when the air-conditioning and heating mode is running, if the following conditions are met, the self-diagnosis result indicates that the air conditioner is operating normally, and continue to judge whether the frequency of the compressor has increased. If yes, the self-diagnosis result indicates that the air conditioner is operating normally; The result of self-diagnosis is that the air conditioner is running abnormally:

The M _excess is greater than zero and the M _{difference is} greater than or equal to zero and the M _loop is less than zero.

Optionally, if any of the following conditions is met when the air conditioner is running in heating mode, the self-diagnosis result indicates that the air conditioner is operating abnormally. Continue to judge whether the speed of the outdoor motor of the air conditioner has increased. If yes, the self-diagnosis result indicates that the air conditioner is operating normally ;No, the result of self-diagnosis is abnormal operation of the air conditioner:

The M _excess is greater than zero and the M _{difference is} greater than or equal to zero and the M _{ring is} equal to zero;

Or, the M is _over equal to zero and the M _{difference is} greater than zero and the M _ring is less than or equal to zero;

Or, said M _excess is greater than or equal to zero and said M _{difference is} equal to zero and said M _loop is less than zero.

Optionally, when the air conditioner is running in the heating mode, if the following conditions are met, the self-diagnosis result is that the air conditioner is short of refrigerant:

The M _{difference is} less than zero and the M _loop is greater than zero.

Optionally, when the air conditioner is running in the heating mode, if the following conditions are met, the self-diagnosis result is that the air conditioner is short of refrigerant, and continue to judge whether the speed of the outdoor motor of the air conditioner is increasing. If yes, the self-diagnosis result is that the air conditioner is running Normal; if not, the self-diagnostic result is that the air conditioner is running abnormally:

The M _excess is greater than zero and the M _{difference is} less than zero and the M _{loop is} equal to zero.

Optionally, when the air conditioner is running in the heating mode, if the following conditions are met, the self-diagnosis result indicates that the air conditioner is operating abnormally, and continue to judge whether the outdoor motor speed of the air conditioner has decreased, whether the liquid volume has decreased, and whether the compressor frequency has decreased. If the judgment result is yes, the self-diagnosis result indicates that the air conditioner is operating normally; otherwise, the self-diagnosis result indicates that the air conditioner is operating abnormally:

The M _excess is greater than zero and the M _{difference is} less than zero and the M _{loop is} equal to zero.

Optionally, when the air conditioner is running in the heating mode, if the following conditions are met, the self-diagnosis result indicates that the air conditioner is operating abnormally, and continue to judge whether the indoor motor speed has dropped, and if the self-diagnosis result indicates that the air conditioner is operating normally, increase the indoor motor speed , otherwise the self-diagnosis result shows that the air conditioner is running abnormally, remind the air conditioner to clean; or, continue to judge whether the outdoor motor speed has dropped, if it is, the self-diagnosis result is that the air conditioner is running normally, increase the outdoor motor speed, otherwise the self-diagnosis result is that the air conditioner is running abnormally , to remind the air conditioner to clean:

The M _cross is less than zero and the M _{difference is} greater than zero and the M _loop is less than or equal to zero.

An air conditioner self-diagnosis device, comprising:

An acquisition unit, the acquisition unit is used to acquire the current internal machine coil temperature T _steam , the external machine coil temperature T _cold , the exhaust pipe temperature T _row and the outdoor ambient temperature T _ring ;

A calculation unit, the calculation unit is used to calculate the degree of superheat T of the exhaust gas and the temperature difference T _{of the} heat source according to the temperature T of the coil of the internal unit, the temperature T _cold of the coil of the external unit and the _temperature T of the _exhaust pipe _bad ;

Calculate the rate of change Mover, _Mdifference , and Mring according to the exhaust gas _{superheat Tpass} , the heat source temperature _{difference Tdifference, and} the outdoor ambient temperature _Tring ;

A control unit, the control unit is used to perform self-diagnostic control on the current air conditioner according to the change rate _Mover , _Mdifference and _Mring .

An air conditioner, comprising a computer-readable storage medium storing a computer program and a processor. When the computer program is read and executed by the processor, the method described in any one of the above-mentioned methods can be realized.

A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, and when the computer program is read and executed by a processor, the method described in any one of the above is implemented.

Description of drawings

Fig. 1 is a flow chart of the self-diagnosis control method described in the specific embodiment of the present invention.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

The invention provides a self-diagnostic control method for an air conditioner, which can identify the operating state of the air conditioner through the exhaust _superheat T and the pressure ratio feedback system operating difference in the operating state of the air conditioner.

The self-diagnostic control method of the present invention feeds back the running state of the system _through the change trend of the exhaust superheat T during the start-up cycle of the air conditioner, and the first-order derivative calculation of the temperature difference between the internal and external coil heat sources and the ambient temperature, and feedbacks the change trend and abnormality of the temperature, Combining with thermal cycle theory, identify system operation conditions, timely and accurately feedback system abnormalities and eliminate them in time;

A self-diagnostic control method for an air conditioner includes the following steps:

Step S1. Obtain the current internal unit coil temperature T _steam , the external unit coil temperature T _cold , the exhaust pipe temperature T _row , and the outdoor ambient temperature T _ring ;

Step S2, according to the coil temperature T of the internal unit, the coil temperature T _cold of the external unit, and the _temperature T of the _exhaust pipe, calculate the difference between the degree of superheat T of the exhaust gas and the temperature _difference T _{of the} heat source;

Step S3: Calculate the rate of change Mover, _Mdifference , and Mring according to the exhaust _superheat degree _Tpass , the heat source temperature _{difference Tdifference, and} the outdoor ambient temperature _Tring ;

Step S4, performing self _- diagnostic control on the current air conditioner according to the rate of change Mover, _Mdifference and _Mring .

Specifically, the temperature value T of the inner disk detected by the temperature sensor of the inner disk is obtained, the temperature value T _cold of the outer disk detected by the temperature sensor of the outer disk is obtained, the _temperature value T of the _exhaust pipe detected by the temperature sensor of the exhaust pipe is obtained, and the ambient temperature outside the air conditioner room is obtained. T _ring ; preferably, get T _steam , T _cool , T _row and T _ring every 5 seconds.

To calculate the degree of superheat T of the exhaust gas and the temperature _difference T _{of the} heat source, it should be noted that the change of the temperature _difference T of the heat source is consistent with the change of the pressure ratio, so the temperature _difference T of the superheat source and the pressure ratio can be replaced, where T _over = T _row - T _cold , T _difference = T _cold - T _steam .

Then calculate the change rate of T _over , T _difference and T _ring M _over , M _difference and M _ring , M _over =(T _over 2-T _over 1)/△t, M _difference =(T _{difference 2} -T _{difference 1} )/△t, M _ring =(T _{ring 2} -T _{ring 1} )/△t; among them, T _over 2 is the exhaust superheat at t2, T _over 1 is the exhaust superheat at t1, T _{difference 2} is the temperature difference of the heat source at time t2, T _{difference 1} is the temperature difference of the heat source at time t1, T _{ring 2} is the ambient temperature outside the air conditioner room at time t2, T _{ring 1} is the ambient temperature outside the air conditioner room at time t1, and time t2 is at time t1 After that, Δt is the time difference between time t2 and time t1, preferably, Δt is in the range of 1-30 seconds.

When the air conditioner is running in cooling mode, as shown in Table 1, by judging whether the M _pass is greater than zero, equal to zero or less than zero, determine whether the M _difference is greater than zero, equal to zero or less than zero, and determine whether the M _ring is greater than zero, equal to zero or less than zero Zero, judging and diagnosing the current working status of the air conditioner. According to the different results of the three judgments, there are different diagnostic results and controls, specifically including:

When the judgment result is _that M is greater than zero, M _{difference is} greater than zero, and M _ring is greater than zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating normally, and continue to judge whether the _flow rate has increased. If T drops _{too much} , increase compressor frequency; if _superheat T does not drop, continue to increase flow rate;

When the judgment result is _that M is greater than zero, M _{difference is} greater than zero, and M _ring is less than or equal to zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating abnormally, and continue to detect and judge whether the speed of the outdoor motor has dropped. If so, the self-diagnosis result is that the air conditioner Normal operation, otherwise the result of self-diagnosis is that the heat exchange effect has deteriorated, and the user is reminded to clean the air conditioner;

When the judgment result is _that M is greater than zero, M _{difference is} equal to zero, and M _ring is greater than zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating normally, and continue to judge whether _{the superheat} T is increased. If yes, increase the flow rate; otherwise, keep the flow rate constant. Change;

When the judgment result is _that M is greater than zero, M _{difference is} equal to zero, and M _ring is less than or equal to zero, the self-diagnosis result of the air conditioner is abnormal operation of the air conditioner, and continue to judge whether the motor speed of the outdoor unit of the air conditioner has dropped. If yes, the self-diagnosis result is that the air conditioner is abnormal. Normal operation; otherwise, remind the air conditioner to clean;

When the judgment result is _that M is greater than zero, M _{difference is} less than zero, and M _ring is greater than zero, the self-diagnosis result of the air conditioner is abnormal operation of the air conditioner, and the self-diagnosis result is determined to be that the air conditioner lacks refrigerant, and the user is reminded to add liquid;

When the judgment result is _that M is greater than zero, M _{difference is} less than zero, and M _ring is less than or equal to zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating abnormally. Continue to judge whether the motor speed of the outdoor unit of the air conditioner has dropped. Normal operation; otherwise, remind the air conditioner to clean;

When the judgment result is that M is _over equal to zero, M _{difference is} greater than zero, and M _ring is greater than zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating normally, and the flow rate and compressor frequency are increased;

When the judgment result is that M is equal _to zero, M _{difference is} greater than zero, and M _ring is less than or equal to zero, the self-diagnosis result of the air conditioner is that the air conditioner is running abnormally, and continue to judge whether the speed of the outdoor motor of the air conditioner has dropped. If yes, the self-diagnosis result is that the air conditioner is running Normal; if not, remind the air conditioner to clean;

When the judgment result is that M is equal _to zero, M _{difference is} equal to zero, and M _ring is greater than or equal to zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating normally;

When the judgment result is that M is equal _to zero, M _{difference is} equal to zero, and M _ring is less than zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating abnormally, and continue to judge whether the motor speed of the outdoor unit of the air conditioner has dropped. If yes, the self-diagnosis result is that the air conditioner is running Normal; if not, remind the air conditioner to clean;

When the judgment result is that M is equal _to zero, M _{difference is} less than zero, and M _ring is greater than zero, the self-diagnosis result of the air conditioner is abnormal operation of the air conditioner, and the self-diagnosis result is determined to be that the air conditioner lacks refrigerant, and the user is reminded to add liquid;

When the judgment result is that M is _over equal to zero, M _{difference is} less than zero, and M _ring is equal to zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating abnormally. Continue to judge whether the speed of the outdoor motor of the air conditioner has increased, whether the liquid volume has decreased, and whether the compressor frequency has decreased. If any judgment result is yes, the self-diagnosis result indicates that the air conditioner is operating normally; otherwise, the self-diagnosis result indicates that the air conditioner is operating abnormally;

When the judgment result is that M is _over equal to zero, M _{difference is} less than zero, and M _ring is less than zero, the air conditioner self-diagnosis result indicates that the air conditioner is operating normally;

When the judgment result is _that M is less than zero, M _{difference is} greater than zero, and M _ring is greater than zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating normally;

When the judgment result is _that M is less than zero, M _{difference is} greater than zero, and M _ring is less than or equal to zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating abnormally. Continue to judge whether the motor speed of the outdoor unit of the air conditioner has dropped. If yes, the self-diagnosis result is that the air conditioner is abnormal. Normal operation; otherwise, remind the air conditioner to clean;

When the judgment result is _that M is less than zero, M _{difference is} equal to zero, and M _ring is greater than or equal to zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating normally;

When the judgment result is _that M is less than zero, M _{difference is} equal to zero, and M _ring is less than zero, the self-diagnosis result of the air conditioner is that the air conditioner is running abnormally. Continue to judge whether the motor speed of the outdoor unit of the air conditioner has dropped. If yes, the self-diagnosis result is that the air conditioner is running Normal; if not, remind the air conditioner to clean;

When the judgment result is _that M is less than zero, M _{difference is} less than zero, and M _ring is greater than zero, the self-diagnosis result of the air conditioner is abnormal operation of the air conditioner, and the self-diagnosis result is determined to be that the air conditioner lacks refrigerant, and the user is reminded to add liquid;

When the judgment result is that the M _cross is less than zero, the M _{difference is} less than zero, and the M _ring is less than or equal to zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating normally.

For example, in cooling mode, the current outdoor ambient temperature T _ring is 35°C, the exhaust pipe temperature T _row is 80°C, the outdoor coil temperature T _cold is 43°C, and the indoor coil temperature T _steam is 13°C, then Exhaust _superheat T = 80°C - 43°C = 37°C, heat source temperature difference T _difference = 43°C - 13°C = 30°C.

When the outdoor ambient temperature and the operating status of the air conditioner change, after 3 seconds, it is detected that the outdoor ambient temperature T _ring is 36°C, the external unit coil temperature T _cold is 43°C, and the internal unit coil temperature T _steam is 11°C. The exhaust pipe temperature T _row is 90°C, the exhaust superheat T _over = 90°C-43°C = 47°C, the heat source temperature difference T _difference = 43°C-11°C = 32°C.

It is calculated that M _pass =(47°C-37°C)/3s, M _difference =(32°C-30°C)/3s, and M _ring =(36°C-35°C)/3s.

Knowing _that M is greater than zero, M _{difference is} greater than zero, and M _ring is greater than zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating normally, and continue to judge whether _{the flow} rate has increased. If it drops, the frequency of the compressor will be increased, and if the _superheat T is not lowered, the flow rate will continue to be increased.

Table 1 Correspondence table of judgment results under cooling conditions

When the air conditioner is running in the heating mode, as shown in Table 2, it is also judged whether _the M difference is greater than zero, equal to zero or less than zero, and whether the M _difference is greater than zero, equal to zero or less than zero, and whether the M _ring is greater than zero or equal to zero, as shown in Table 2. Judging and diagnosing the current working status of the air conditioner, according to the three judgments, there are different diagnosis results and controls, specifically including:

When the judgment result is _that M is greater than zero, M _{difference is} greater than zero, and M _ring is greater than zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating normally, and the frequency of the compressor is controlled to increase;

When the judgment result is _that M is greater than zero, M _{difference is} greater than zero, and M _ring is equal to zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating abnormally. Continue to detect and judge whether the speed of the outdoor motor of the air conditioner has increased. The air conditioner is running normally; if not, the self-diagnosis result is that the air conditioner is running abnormally;

When the judgment result is _that M is greater than zero, M _{difference is} greater than zero, and M _ring is less than zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating normally, and continue to detect and judge whether the frequency of the compressor has increased. If yes, the self-diagnosis result is that the air conditioner Normal operation; if not, the self-diagnosis result indicates that the air conditioner is operating abnormally;

When the judgment result is that the M _excess is greater than zero, the M _{difference is} equal to zero, and the M _ring is greater than zero, the self-diagnosis result of the air conditioner indicates that the air conditioner is operating normally;

When the judgment result is _that M is greater than zero, M _{difference is} equal to zero, and M _ring is less than or equal to zero, the self-diagnosis result of the air conditioner is abnormal operation of the air conditioner. Continue to detect and judge whether the speed of the outdoor motor of the air conditioner has increased. The air conditioner is running normally; if not, the self-diagnosis result is that the air conditioner is running abnormally;

When the judgment result is _that M is greater than zero, M _{difference is} less than zero, and M _ring is greater than zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating abnormally, and the self-diagnosis result is that the air conditioner is short of refrigerant;

When the judgment result is _that M is greater than zero, M _{difference is} less than zero, and M _ring is equal to zero, the self-diagnosis result of the air conditioner is that the air conditioner is running abnormally. If yes, the self-diagnosis result indicates that the air conditioner is operating normally; if not, the self-diagnosis result indicates that the air conditioner is operating abnormally;

When the judgment result is _that M is greater than zero, M _{difference is} less than zero, and M _ring is less than zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating normally, and continue to detect and judge whether the frequency of the compressor has increased. If yes, the self-diagnosis result is that the air conditioner Normal operation; if not, the self-diagnosis result indicates that the air conditioner is operating abnormally;

When the judgment result is that M is equal _to zero, M _{difference is} greater than zero, and M _ring is greater than zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating normally, and the frequency of the compressor is controlled to increase;

When the judgment result is that M is _{over or} equal to zero, M _{difference is} greater than zero, and M _ring is less than or equal to zero, the self-diagnosis result of the air conditioner is abnormal operation of the air conditioner. Continue to detect and judge whether the speed of the outdoor motor of the air conditioner has increased. The air conditioner is running normally; if not, the self-diagnosis result is that the air conditioner is running abnormally;

When the judgment result is that M is equal _to zero, M _{difference is} equal to zero, and M _ring is greater than or equal to zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating normally;

When the judgment result is that M is equal _to zero, M _{difference is} equal to zero, and M _ring is less than zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating abnormally. Continue to detect and judge whether the speed of the outdoor motor of the air conditioner has increased. Normal operation; if not, the self-diagnosis result indicates that the air conditioner is operating abnormally;

When the judgment result is that M is equal _to zero, M _{difference is} less than zero, and M _ring is greater than zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating abnormally, and the self-diagnosis result is that the air conditioner is short of refrigerant, and the user is reminded to add liquid;

When the judgment result is that M is _over equal to zero, M _{difference is} less than zero, and M _ring is equal to zero, the self-diagnosis result of the air conditioner is abnormal operation of the air conditioner, continue to detect and continue to judge whether the speed of the outdoor motor of the air conditioner has decreased, whether the liquid volume has decreased and the frequency of the compressor Whether it has dropped, if any judgment result is yes, the self-diagnosis result indicates that the air conditioner is operating normally, otherwise the self-diagnosis result indicates that the air conditioner is operating abnormally;

When the judgment result is that M is _over equal to zero, M _{difference is} less than zero, and M _ring is less than zero, the air conditioner self-diagnosis result indicates that the air conditioner is operating normally;

When the judgment result is _that M is less than zero, M _{difference is} greater than zero, and M _ring is greater than zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating normally;

When the judgment result is _that M is less than zero, M _{difference is} greater than zero, and M _ring is less than or equal to zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating abnormally. Continue to detect and judge whether the indoor motor speed has dropped. If yes, the self-diagnosis result is that the air conditioner is operating normally. , increase the speed of the indoor motor, otherwise the self-diagnosis result indicates that the air conditioner is running abnormally, and remind the air conditioner to clean; or, judge whether the speed of the outdoor motor has decreased, and if it is, the self-diagnosis result indicates that the air conditioner is operating normally, and increase the speed of the outdoor motor, otherwise the self-diagnosis result is The air conditioner is running abnormally, remind the air conditioner to clean;

When the judgment result is _that M is less than zero, M _{difference is} equal to zero, and M _ring is greater than or equal to zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating normally;

When the judgment result is _that M is less than zero, M _{difference is} equal to zero, and M _ring is less than zero, the self-diagnosis result of the air conditioner is abnormal operation of the air conditioner. Continue to detect and judge whether the speed of the outdoor motor of the air conditioner has increased. The air conditioner is running normally; if not, the self-diagnosis result is that the air conditioner is running abnormally;

When the judgment result is _that M is less than zero, M _{difference is} less than zero, and M _ring is greater than zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating abnormally, and the self-diagnosis result is that the air conditioner is short of refrigerant, and the user is reminded to add liquid;

When the judgment result is that the M _cross is less than zero, the M _{difference is} less than zero, and the M _ring is less than or equal to zero, the self-diagnosis result of the air conditioner is that the air conditioner is operating normally.

For example, in heating mode, the current outdoor ambient temperature T _ring is 2°C, the exhaust pipe temperature T _row is 60°C, the outdoor unit coil temperature T _cold is 38°C, and the indoor unit coil temperature T _steam is -6°C , then the exhaust _superheat degree T = 60°C-38°C = 22°C, and the heat source temperature difference T _difference = 38°C-6°C = 32°C.

When the ambient temperature and the operating status of the air conditioner change, after 3 seconds, it is detected that the outdoor ambient temperature T _ring is 1°C, the external unit coil temperature T is _cold 36°C, and the internal unit coil temperature T is _steaming -10°C. Exhaust pipe temperature T is 65°C, _{exhaust superheat} T = 65°C - 40°C = 25°C, heat source temperature difference T _difference = 40°C - 10°C = 30°C.

It is calculated that M _pass =(25°C-22°C)/3s, M _difference =(30°C-32°C)/3s, and M _ring =(1°C-2°C)/3s.

Know _that M is greater than zero, M _{difference is} less than zero, and M _ring is less than zero, then the self-diagnosis result of the air conditioner is that the air conditioner is operating normally, and then continue to detect and judge whether the frequency of the compressor has risen, if yes, the self-diagnosis result is that the air conditioner is operating normally ;No, the result of self-diagnosis is that the air conditioner is running abnormally.

Table 2 Correspondence table of judgment results under heating conditions

The self-diagnostic control method of the air conditioner provided by the present invention avoids the difference of individual data and causes misjudgment through the temperature collection and processing within the cycle; and through the change trend of the superheat degree, the temperature difference of the heat source and the outdoor environment, one is to grasp the current internal disk The second is to feedback the change trend, accurately feedback the machine's operating status, and take precautions in advance; according to the periodic changes in the temperature difference of the heat source of the coil and the exhaust superheat, feedback the operation status, and the self-test program of the air conditioner is reliable and stable .

Optionally, the temperature difference change can also be used. If the current coil temperature is lower than the initial reference temperature ΔT, then the temperature change is determined and the cooling or heating effect is fed back to achieve the self-test effect. The initial reference temperature ΔT is 11 In the range of ~15°C, for example, in cooling mode, the current internal coil temperature is 13°C, which is normal. If the current internal coil temperature is 10°C, the feedback cooling effect is slightly poor, and self-test is implemented.

Optionally, the change slope value of the return air pipe temperature can also be used to replace the exhaust _superheat T. If the current outdoor ambient temperature remains unchanged, the change slope of the return air pipe temperature can be detected. When the slope changes positively, it indicates that the superheat degree increases , on the contrary, it indicates that the degree of superheat decreases, and then according to the change of degree of superheat, it realizes self-test and feedbacks the effect of cooling and heating.

The present invention also provides an air conditioner self-diagnosis device for realizing the above-mentioned air conditioner self-diagnosis control method, including:

An acquisition unit, the acquisition unit is used to acquire the current internal machine coil temperature T _steam , the external machine coil temperature T _cold , the exhaust pipe temperature T _row and the outdoor ambient temperature T _ring ;

A calculation unit, the calculation unit is used to calculate the degree of superheat T of the exhaust gas and the temperature difference T _{of the} heat source according to the temperature T of the coil of the internal unit, the temperature T _cold of the coil of the external unit and the _temperature T of the _exhaust pipe _bad ;

Calculate the rate of change Mover, _Mdifference , and Mring according to the exhaust gas _{superheat Tpass} , the heat source temperature _{difference Tdifference, and} the outdoor ambient temperature _Tring ;

A control unit, the control unit is used to perform self-diagnostic control on the current air conditioner according to the change rate _Mover , _Mdifference and _Mring .

An air conditioner is also provided, the air conditioner includes a computer-readable storage medium storing a computer program and a processor, and when the computer program is read and run by the processor, the above-mentioned self-diagnosis control method is realized .

The present invention also provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is read and executed by a processor, the above-mentioned self-diagnosis control method is realized.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so the protection scope of the present invention should be based on the scope defined in the claims.

Claims (21)

1. An air conditioner self-diagnostic control method, characterized in that, comprising: Obtain the current internal unit coil temperature T _steam , external unit coil temperature T _cold , exhaust pipe temperature T _row and outdoor ambient temperature T _ring ; According to the internal unit coil temperature T _steam , the external machine coil temperature T _cold and the exhaust pipe temperature T _exhaust , calculate the difference between the exhaust superheat T and the temperature _difference T _{of the} heat source; Calculate the rate of change Mover, _Mdifference , and Mring according to the exhaust gas _{superheat Tpass} , the heat source temperature _{difference Tdifference, and} the outdoor ambient temperature _Tring ; According to the rate of change Mover, _Mdifference and _Mring , self _- diagnosis control is performed on the current air conditioner. 2. The self-diagnosis control method as claimed in claim 1, characterized in that, the temperature difference T _difference of the heat source is replaced by the operating pressure ratio of the air conditioner, the rate of change M _{ratio is} calculated, and the M ratio is combined _with the M _ring to calculate the current The air conditioner performs self-diagnostic control. 3. The self-diagnostic control method as claimed in claim 1, characterized _in that, said M = (T = (T = ₂ - T = ₁ ) / Δt, and said T = ₂ is the degree of exhaust superheat at _t2 , the T ₁ is the exhaust superheat at time t ₁ ; The M _difference =(T _{difference 2} -T _{difference 1} )/Δt, the T _{difference 2} is the heat source temperature difference at _t2 , and the T _{difference 1} is the heat source temperature difference at _t1 moment; Described M _ring =(T _{ring 2} -T _{ring 1} )/Δt, described T _{ring 2} is the ambient temperature outside the air conditioner room at _t2 , and described T _{ring 1} is the air conditioner room outside environment at _t1 time temperature; The Δt is the time difference between time _t2 and time _t1 . 4. The self-diagnosis control method according to claim 3, characterized in that, the Δt is in the range of 1-30 seconds. 5. The self-diagnosis control method as claimed in claim 1, characterized in that, when the air conditioner is running in cooling mode, if any of the following conditions is met, the self-diagnosis result is that the air conditioner is operating normally; if any of the above-mentioned conditions is not met, the self-diagnosis is The result is that the air conditioner is running abnormally: The M _excess is greater than zero and the M _{difference is} greater than or equal to zero and the M _ring is greater than zero; Or, said M is less than or equal _to zero and said M _{difference is} greater than zero and said M _ring is greater than zero; Or, said M is less than or equal _to zero and said M _{difference is} equal to zero and said M _ring is greater than or equal to zero; Or, said M is _over equal to zero and said M _{difference is} less than zero and said M _ring is less than zero; Or, the M _cross is less than zero, the M _{difference is} less than zero, and the M _loop is less than or equal to zero. 6. The self-diagnosis control method as claimed in claim 5, characterized in that, when the air-conditioning cooling mode is running, if the following conditions are met, the self-diagnosis result is that the air conditioner is operating normally, and continue to judge whether the flow rate has increased, and if so, continue to judge Whether the degree of _superheat T _has decreased, the frequency of the compressor will be increased if the degree of superheat T has decreased, and the flow rate will continue to increase if the degree of superheat T _has not decreased: The M _excess is greater than zero and the M _{difference is} greater than zero and the M _loop is greater than zero. 7. The self-diagnosis control method as claimed in claim 5, characterized in that, when the air conditioner is running in cooling mode, if the following conditions are met, the self-diagnosis result is that the air conditioner is operating normally, and continue to judge whether the degree of _superheat T has increased, yes , then increase traffic: The M _excess is greater than zero and the M _{difference is} equal to zero and the M _ring is greater than zero. 8. The self-diagnosis control method as claimed in claim 5, characterized in that, when the air conditioner is in cooling mode, if the following conditions are met, the self-diagnosis result is that the air conditioner is operating normally, and the flow rate and compressor frequency are increased: The M _over equals to zero and the M _{difference is} greater than zero and the M _loop is greater than zero. 9. The self-diagnostic control method as claimed in claim 1, characterized in that, when the air-conditioning cooling mode is running, if any of the following conditions is met, it will continue to judge whether the motor speed of the outdoor unit of the air conditioner has decreased, and if yes, the self-diagnostic result is The air conditioner is running normally; if not, remind the air conditioner to clean: The M is greater than zero and _the M _ring is less than or equal to zero; Or, said M is less than or equal _to zero and said M _{difference is} greater than zero and said M _ring is less than or equal to zero; Or, said M is less than or equal _to zero and said M _{difference is} equal to zero and said M _ring is less than zero; Or, the M _cross is less than zero and the M _{difference is} greater than zero and the M _ring is less than or equal to zero; Or, said M is _over equal to zero and said M _{difference is} less than zero and said M _{loop is} equal to zero. 10. The self-diagnosis control method according to claim 1, wherein when the air conditioner is running in cooling mode, the self-diagnosis result is that the air conditioner lacks refrigerant if the following conditions are met: The M _{difference is} less than zero and the M _loop is greater than zero. 11. The self-diagnosis control method as claimed in claim 1, characterized in that, when any of the following conditions are met, the self-diagnosis result indicates that the air conditioner is operating normally; otherwise, the self-diagnosis result indicates that the air conditioner is operating abnormal: said M _{difference is} greater than zero and said M _ring is greater than zero; Or, said M is greater _than zero and said M _is less than zero; Or, said M _excess is greater than zero and said M _{difference is} equal to zero and said M _ring is greater than zero; Or, said M is less than or equal _to equal and said M _{difference is} equal to zero and said M _ring is greater than or equal to zero; Or, said M is less than or equal _to zero and said M _{difference is} less than zero and said M _ring is less than zero; Or, the M _cross is less than zero and the M _{difference is} less than or equal to zero and the M _{ring is} equal to zero; Or, said M is equal _to zero and said M _{difference is} equal to zero and said M _ring is greater than or equal to zero; Or, said M _cross is less than zero and said M _{difference is} equal to zero and said M _loop is greater than zero. 12. The self-diagnosis control method according to claim 11, characterized in that, when the air conditioner is running in the heating mode, the self-diagnosis result indicates that the air conditioner is operating normally, and the frequency of the compressor is continued to be controlled if the following conditions are met: The M _excess is greater than or equal to zero and the M _{difference is} greater than zero and the M _loop is greater than zero. 13. The self-diagnostic control method according to claim 11, characterized in that, when the air conditioner is running in the heating mode, the self-diagnosis result indicates that the air conditioner is operating normally if the following conditions are met, and it continues to judge whether the frequency of the compressor has increased, yes , the self-diagnosis result indicates that the air conditioner is operating normally; otherwise, the self-diagnosis result indicates that the air conditioner is operating abnormally: The M _excess is greater than zero and the M _{difference is} greater than or equal to zero and the M _loop is less than zero. 14. The self-diagnostic control method according to claim 1, characterized in that, when any of the following conditions are met, the self-diagnosis result is that the air conditioner is running abnormally when the air conditioner is running in the heating mode, and the speed of the motor outside the air conditioner is continued to be judged If yes, the self-diagnosis result indicates that the air conditioner is operating normally; if not, the self-diagnosis result indicates that the air conditioner is operating abnormally: The M _excess is greater than zero and the M _{difference is} greater than or equal to zero and the M _{ring is} equal to zero; Or, the M is _over equal to zero and the M _{difference is} greater than zero and the M _ring is less than or equal to zero; Or, said M _excess is greater than or equal to zero and said M _{difference is} equal to zero and said M _loop is less than zero. 15. The self-diagnostic control method according to claim 1, characterized in that, when the air-conditioning heating mode is running, the self-diagnosis result is that the air conditioner is short of refrigerant if the following conditions are met: The M _{difference is} less than zero and the M _loop is greater than zero. 16. The self-diagnosis control method according to claim 1, characterized in that, when the air-conditioning heating mode is running, if the following conditions are met, the self-diagnosis result is that the air conditioner is short of refrigerant, and continue to judge whether the outdoor motor of the air conditioner is Whether the rotation speed has increased, if yes, the self-diagnosis result indicates that the air conditioner is operating normally; if not, the self-diagnosis result indicates that the air conditioner is operating abnormally: The M _excess is greater than zero and the M _{difference is} less than zero and the M _{loop is} equal to zero. 17. The self-diagnosis control method according to claim 1, characterized in that, when the air conditioner is running in the heating mode, if the following conditions are met, the self-diagnosis result is that the air conditioner is running abnormally, and it continues to judge whether the outdoor motor speed of the air conditioner is Decrease, whether the liquid volume has decreased, and whether the compressor frequency has decreased. If any judgment result is yes, the self-diagnosis result indicates that the air conditioner is operating normally, otherwise the self-diagnosis result indicates that the air conditioner is operating abnormally: The M _excess is greater than zero and the M _{difference is} less than zero and the M _{loop is} equal to zero. 18. The self-diagnosis control method according to claim 1, characterized in that, when the air-conditioning and heating mode is running, the self-diagnosis result is that the air conditioner is running abnormally if the following conditions are met, and it continues to judge whether the indoor motor speed has dropped, yes If the result of self-diagnosis is that the air conditioner is operating normally, increase the speed of the indoor motor; otherwise, the result of self-diagnosis is that the air conditioner is operating abnormally, and remind the air conditioner to clean; Increase the speed of the outdoor motor, otherwise the self-diagnosis result shows that the air conditioner is running abnormally, and reminds the air conditioner to clean: The M _cross is less than zero and the M _{difference is} greater than zero and the M _loop is less than or equal to zero. 19. An air conditioner self-diagnosis device, characterized in that it comprises: An acquisition unit, the acquisition unit is used to acquire the current internal machine coil temperature T _steam , the external machine coil temperature T _cold , the exhaust pipe temperature T _row and the outdoor ambient temperature T _ring ; A calculation unit, the calculation unit is used to calculate the degree of superheat T of the exhaust gas and the _{temperature difference T of the heat source according to the temperature T of the internal machine coil, the temperature T cold of the} external machine coil and the temperature T of the _exhaust pipe _bad ; Calculate the rate of change Mover, _Mdifference , and Mring according to the exhaust gas _{superheat Tpass} , the heat source temperature _{difference Tdifference, and} the outdoor ambient temperature _Tring ; A control unit, the control unit is used to perform self-diagnostic control on the current air conditioner according to the change rate _Mover , _Mdifference and _Mring . 20. An air conditioner, characterized in that it includes a computer-readable storage medium and a processor storing a computer program, and when the computer program is read and run by the processor, it can realize any one of claims 1-18. method described in the item. 21. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, and when the computer program is read and run by a processor, the computer program according to any one of claims 1-18 is implemented. described method.