CN106247530B - More air-conditioning self checking methods are dragged in multitube frequency conversion one - Google Patents
More air-conditioning self checking methods are dragged in multitube frequency conversion one Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 13
- 238000004378 air conditioning Methods 0.000 title abstract description 4
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 230000002159 abnormal effect Effects 0.000 claims abstract description 9
- 238000004891 communication Methods 0.000 claims description 8
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000001012 protector Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 20
- 238000012360 testing method Methods 0.000 abstract description 9
- 230000008092 positive effect Effects 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000003507 refrigerant Substances 0.000 description 4
- 230000008439 repair process Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
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- 238000010438 heat treatment Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
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Abstract
The invention discloses a kind of multitube frequency conversions one to drag more air-conditioning self checking methods, comprising the following steps: calculates self-test operating parameter step；Self-test step, comprising: (1), control into Auto-Sensing Mode；(2), the time for being switched on and running setting is successively forced to online each indoor unit in sequence；(3), current outdoor circumstance temperature is detected, current corresponding outdoor unit wind speed is found out from press frequency-outdoor circumstance temperature look-up table；(4), indoor unit wind speed is run by low wind after being switched on；(5), liquid pipe temperature T ' liq and coil temperature T ' coil of the current operation indoor unit of detection；(6), judge whether it is abnormal；(8), by judgment result displays.The advantages and positive effects of the present invention are: can be precisely respectively to each online indoor machine testing, when failure, can also precisely determine failure machine, improve the accuracy of detection.
Description
Technical Field
The invention belongs to the technical field of automatic control, and particularly relates to a self-checking method of a multi-pipe variable-frequency multi-split air conditioner.
Background
At present, domestic high-rise buildings are more and more, outdoor unit installation machine positions are limited, and the requirement of consumers for multiple air conditioners can be met by one-driving-multiple multi-system frequency conversion and excellent use performance. The installation of multi-pipe one-to-many products is similar to that of household one-to-one products, and each internal unit corresponds to 1 online line and 1 pair of online pipes of the external unit. The installation of the on-line pipes and on-line lines needs to correspond to the electronic expansion valves in the outdoor unit one by one, and the air conditioner can normally operate. However, in the process of installing the air conditioner, because the air conditioner works aloft and each indoor unit needs to correctly connect the on-line pipe and the on-line wire to the outdoor unit, when a plurality of indoor units are connected, the problem that the on-line pipe and the on-line pipe are not installed correspondingly exists, and the air conditioner cannot normally operate. The installed starting-up debugging process is manually controlled, in the on-line testing process, testers need to set a refrigeration mode and a heating mode for the air conditioning system in sequence to carry out corresponding tests so as to determine whether the whole air conditioning system can normally run on line, and in the detection process, each internal unit needs to be manually debugged respectively.
The testing method mainly has the following defects that because the internal machines are dispersedly installed and adopt a manual detection mode, debugging personnel are required to respectively and sequentially detect the performance of each internal machine, and the working time and the working load of the debugging personnel are greatly increased.
Disclosure of Invention
The invention provides a self-checking method of a multi-pipe system frequency conversion multi-split air conditioner, which aims to solve the technical problem that the manual detection efficiency of the existing multi-pipe system frequency conversion multi-split air conditioner is low.
In order to solve the technical problems, the invention adopts the following technical scheme:
a self-checking method of a multi-pipe system variable frequency one-driving-multiple air conditioner comprises the following steps:
calculating self-checking operation parameters, comprising:
calculating the frequency of a press corresponding to the self-checking operation of each indoor unit on line;
calculating the opening degree of an electronic expansion valve corresponding to the self-checking operation of each indoor unit of the on-line system;
the self-checking step comprises the following steps:
(1) controlling to enter a self-checking mode;
(2) the indoor units of the on-line machine are forcibly started and run for a set time in sequence, at most one indoor unit runs at any moment, and the liquid pipe temperature T of the currently running indoor unit is detected before each indoor unit is startedliqAnd coil temperature Tcoil(ii) a Searching the frequency of a compressor and the opening of the electronic expansion valve corresponding to the self-checking operation of the currently-operated indoor unit, and controlling the operation of the compressor and the opening of the electronic expansion valve according to the frequency and the opening after the indoor unit is started;
(3) detecting the current outdoor environment temperature, searching out the current corresponding outdoor unit wind speed from a press frequency-outdoor environment temperature lookup table, and controlling an outdoor fan according to the current corresponding outdoor unit wind speed after the outdoor unit is started;
(4) after the machine is started, the air speed of the indoor unit is operated according to low wind;
(5) and detecting the liquid pipe temperature T 'of the currently operated indoor unit after the indoor unit operates for the set time'liqAnd coil temperature T'coil；
(6) Calculating the temperature difference delta T1 of the liquid pipe temperature before and after the indoor units are started and the temperature difference delta T2 of the coil temperature,
Δ T1 =/d'liq-Tliq︳；
⊿T2=︳T’coil-Tcoil︳；
(7) Comparing the delta T1 and the delta T2 with a set threshold respectively, and if the delta T1 and the delta T2 are both larger than the set threshold, determining that the indoor unit is normal, otherwise, determining that the indoor unit is abnormal;
(8) and displaying the judgment result.
Further, in the step of calculating the self-checking operation parameters, the method for calculating the press frequency Fr corresponding to the self-checking operation of the indoor unit comprises the following steps:
Fr=Kf×Capin+B
wherein Kf is a frequency calculation coefficient;
the Capin is the capacity code of the indoor unit and is pre-stored in the program of the indoor unit,
capin = indoor unit refrigerating capacity/100, B is frequency calculation intercept, and Kf and B are constants.
Further, in the step of calculating the self-checking operation parameters, the method for calculating the opening Fk of the electronic expansion valve corresponding to the self-checking operation of the indoor unit includes:
Fk =Fr×Kfk ×[1+（Tin－27）×Kin+（Tout－35）×Kout）]
wherein Kfk is the frequency opening coefficient, Tin is the indoor ambient temperature of the currently operating indoor unit, Kin is the indoor ambient temperature coefficient of the currently operating indoor unit, Tout is the outdoor ambient temperature of the outdoor unit,
kout is the outdoor ambient temperature coefficient of the outdoor unit, Tin and Tout are respectively acquired by corresponding ambient temperature sensors, and Kfk, Kin and Kout are constant values.
Further, after entering the self-checking mode in the step (1), the method further comprises the steps of firstly detecting whether the communication with each indoor machine chip, each outdoor driving chip and each outdoor EE is normal, detecting whether each temperature sensor, each direct current motor, each compressor thermal protector and each pressure switch are open-circuited or short-circuited, and the like, and if the communication fails, reporting the fault to repair and entering the next step.
Further, the method for controlling to enter the self-test mode in the step (1) includes:
a. controlling the indoor unit to send a self-checking mode signal to an outdoor unit main control chip through an indoor unit remote controller, and enabling the outdoor unit to forcibly enter a self-checking mode;
or,
b. the outdoor unit is forced to enter a self-checking mode by operating a digital tube control key on the outdoor unit main control panel and sending a self-checking mode signal to the outdoor unit main control chip.
Further, in the step (3), the lookup table of the press frequency and the outdoor ambient temperature is as follows: the method comprises the steps that the outdoor environment temperature is divided into M +1 temperature intervals by adopting M temperature values, the press frequency is divided into N +1 frequency intervals by adopting N frequency points, the air speed of an outdoor unit is uniquely determined by each temperature interval and each frequency interval, the outdoor unit searches the rotating speed of an outdoor fan in the corresponding interval according to the collected outdoor environment temperature and the calculated press frequency during self-checking, wherein M, N is a positive integer.
Further, in the step (7), when Δ T1 and Δ T2 of the current indoor unit are determined to be abnormal, a difference Δ T1 'between the temperatures of the liquid pipes of the other indoor units not being started before and after the current indoor unit is started and a difference Δ T2' between the temperatures of the coils are calculated, Δ T1 'and Δ T2' are respectively compared with a set threshold, and if Δ T1 'and/or Δ T2' are/is greater than the set threshold, it is determined that there is an electronic expansion valve reverse connection or a line signal reverse connection fault between the indoor unit and the current indoor unit.
Compared with the prior art, the invention has the advantages and positive effects that:
1. the indoor unit starting detection of each indoor unit can be accurately and respectively detected, and the fault unit can be accurately determined when the fault occurs.
2. The capacities of the indoor machines are various, the self-checking frequencies of the indoor machines with different capacities are different, the specific frequency is determined according to the capacity experiment of the machine types, and the detection accuracy is improved.
3. The air speed of the indoor unit detected in the self-checking mode runs according to low wind, and the condition that the refrigerant state of the indoor heat exchanger is in an overheating state or the position of a coil pipe of the indoor unit is in the flow of an overheating area during detection is avoided.
Other features and advantages of the present invention will become more apparent from the detailed description of the embodiments of the present invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a system schematic block diagram of a multi-system inverter-multi-split air conditioner self-checking method according to the present invention;
fig. 2 is a flow chart of a self-checking method for a multi-system inverter-multi-split air conditioner according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In a first embodiment, the present invention provides a self-checking method for a multi-system frequency conversion multi-split air conditioner, as shown in fig. 1, which is a schematic diagram of a multi-system frequency conversion multi-split air conditioner system, and includes an outdoor unit and a plurality of indoor units, as shown in fig. 2, the self-checking method for a multi-system frequency conversion multi-split air conditioner of the present embodiment includes the following steps:
calculating self-checking operation parameters, comprising:
calculating the frequency of a press corresponding to the self-checking operation of each indoor unit on line; because the capacities of the indoor machines are various, the self-checking frequencies of the indoor machines with different capacities are different during self-checking, and the specific frequency is determined according to the capacity experiment of the machine types, so that the accuracy of detection can be improved.
Calculating the opening degree of an electronic expansion valve corresponding to the self-checking operation of each indoor unit of the on-line system;
the self-checking step comprises the following steps:
s1, controlling to enter a self-checking mode;
s2, sequentially forcing the indoor units on line to start and operate for a set time according to the sequence (such as evaporators A, B, C and D in figure 1), wherein at most one indoor unit operates at any moment, and before starting each indoor unit, detecting the liquid pipe temperature T of the currently operating indoor unitliqAnd coil temperature Tcoil(ii) a Searching the frequency of a compressor and the opening of the electronic expansion valve corresponding to the self-checking operation of the currently-operated indoor unit, and controlling the operation of the compressor and the opening of the electronic expansion valve according to the frequency and the opening after the indoor unit is started; the indoor unit starting detection in the step is carried out in sequence, the indoor units of all the online units can be accurately and respectively detected, and the fault machine can be accurately determined when the fault occurs.
S3, detecting the current outdoor environment temperature, finding out the current corresponding outdoor unit wind speed from the press frequency-outdoor environment temperature lookup table, and controlling the outdoor fan according to the current outdoor unit wind speed after the outdoor unit is started; the outdoor wind speed control in the self-checking mode judges the wind speed according to the outdoor environment temperature and the frequency of the press, and ensures that the whole system is in a reasonable range and the reliability of detection when the self-checking mode is started in any environment.
S4, operating the indoor unit at low wind speed after starting up; the air speed of the indoor unit runs according to low wind in the self-checking mode, so that the condition that the refrigerant state of the indoor heat exchanger is in a gas phase area during detection or the position of a coil pipe of the indoor unit is in the flow of the gas phase area due to uneven distribution of the flow of the indoor unit can be avoided.
S5, detecting the current operation after the indoor unit operates for the set timeLiquid pipe temperature T 'of indoor unit'liqAnd coil temperature T'coil；
S6, calculating the temperature difference delta T1 of the temperature of the liquid pipes before and after the indoor units are started and the temperature difference delta T2 of the temperature of the coil pipe,
Δ T1 =/d'liq-Tliq︳；
⊿T2=︳T’coil-Tcoil︳；
S7, comparing the delta T1 and the delta T2 with a set threshold respectively, and if the delta T1 and the delta T2 are both larger than the set threshold, determining that the indoor unit is normal, otherwise, determining that the indoor unit is abnormal; the liquid pipe temperature before and after the indoor units are started and the coil pipe temperature are compared, so that the accuracy and reasonableness of detection are ensured.
And S8, displaying the judgment result.
Preferably, in the step of calculating the self-checking operation parameters in this embodiment, the method for calculating the press frequency Fr corresponding to the self-checking operation of the indoor unit includes:
Fr=Kf×Capin+B
wherein Kf is a frequency calculation coefficient;
the Capin is the capacity code of the indoor unit and is pre-stored in the program of the indoor unit,
capin = indoor unit refrigerating capacity/100, B is frequency calculation intercept, and Kf and B are constants.
The press frequency during self-checking is changed in a linear equation oblique line mode according to the capacity of the indoor unit, so that different self-checking frequencies of the indoor unit presses with different capacities are realized, and the accuracy of detection is improved.
In the step of calculating the self-checking operation parameters, the method for calculating the opening Fk of the electronic expansion valve corresponding to the self-checking operation of the indoor unit comprises the following steps:
Fk =Fr×Kfk ×[1+（Tin－27）×Kin+（Tout－35）×Kout）]
wherein Kfk is the frequency opening coefficient, Tin is the indoor ambient temperature of the currently operating indoor unit, Kin is the indoor ambient temperature coefficient of the currently operating indoor unit, Tout is the outdoor ambient temperature of the outdoor unit,
kout is the outdoor ambient temperature coefficient of the outdoor unit, Tin and Tout are respectively acquired by corresponding ambient temperature sensors, and Kfk, Kin and Kout are constant values.
The opening of the electronic expansion valve in the self-checking mode is calculated according to the environment temperature of the self-checking internal machine, the environment temperature of the external machine and the frequency of the press, so that the opening is calculated reasonably, and false alarm faults are avoided.
Preferably, after entering the self-checking mode in step S1, before the other steps, the method further includes detecting whether communications with each indoor unit chip, each outdoor drive chip, and each outdoor EE memory chip are normal, detecting whether each temperature sensor, each dc motor, each compressor thermal protector, and each pressure switch are open-circuited or short-circuited, and the like, and if there is a fault, reporting a fault to repair, and then entering the next step. The method has wide application to the self-detection of communication abnormity, ensures that other detections are carried out after the communication is normal by placing the communication detection at the head, and prevents useless detection analysis and time waste of subsequent detections.
There are various methods for controlling the air conditioner to enter the self-test mode, and the method for controlling the air conditioner to enter the self-test mode in step S1 of this embodiment includes:
a. controlling the indoor unit to send a self-checking mode signal to an outdoor unit main control chip through an indoor unit remote controller, and enabling the outdoor unit to forcibly enter a self-checking mode;
or,
b. the outdoor unit is forced to enter a self-checking mode by operating a digital tube control key on the outdoor unit main control panel and sending a self-checking mode signal to the outdoor unit main control chip.
In step S3, the press frequency-outdoor loop temperature lookup table is: the method comprises the steps that the outdoor environment temperature is divided into M +1 temperature intervals by adopting M temperature values, the press frequency is divided into N +1 frequency intervals by adopting N frequency points, the air speed of an outdoor unit is uniquely determined by each temperature interval and each frequency interval, the outdoor unit searches the rotating speed of an outdoor fan in the corresponding interval according to the collected outdoor environment temperature and the calculated press frequency during self-checking, wherein M, N is a positive integer.
In the step (7), when Δ T1 and Δ T2 of the current indoor unit are determined to be abnormal, a temperature difference Δ T1 'between the liquid pipe temperatures of the other indoor units which are not started before and after the current indoor unit is started and a temperature difference Δ T2' between the coil temperatures are calculated, Δ T1 'and Δ T2' are respectively compared with a set threshold, and if Δ T1 'and/or Δ T2' are/is greater than the set threshold, it is determined that there is an electronic expansion valve reverse connection or an online line signal reverse connection fault between the indoor unit and the current indoor unit. If the temperature difference of the liquid pipe temperature and the temperature difference of the coil pipe temperature do not reach the expected change after the current indoor unit operates for a period of time, on the contrary, the temperature difference delta T1 'of the liquid pipe temperature of the indoor unit which is not started and the temperature difference delta T2' of the coil pipe temperature change over the preset value, which shows that the current operating indoor unit is reversely connected with the pipeline of the indoor unit which is not started and the temperature change of which over the threshold value, the current indoor unit can operate without cooling, and the other indoor units which are not operated can perform cooling. The method can not only detect the fault, but also quickly locate the indoor unit which is reversely connected with the current indoor unit when the fault is reversely connected.
And under the condition of judging as abnormal, selecting manual inspection to repair the fault, or matching the corresponding temperature sensor, the on-line signal, the electronic expansion valve signal and the corresponding self-checking internal machine according to the detection result of judging as abnormal, writing the signals into a program for memorizing, and corresponding to the automatically repaired temperature during normal operation.
By the method, the abnormity of the air conditioner in the installation and production process can be intelligently judged, such as
1. The temperature difference between the front and rear liquid pipes of the started indoor unit, the coil pipe delta T1 and the delta T2 is unchanged, the temperature difference between the other indoor liquid pipes which are not started and the temperature difference between the coil pipe delta T1 'and the delta T2' are also unchanged, and the situation that no refrigerant flows in the indoor unit system of the started indoor unit is judged, so that the problems that the electronic expansion valve is not opened due to the fact that the stop valve is not opened, the electronic expansion valve body or the coil or the control panel is failed, the refrigerant is not communicated due to the fact that the pipe is shriveled when the indoor unit is installed, the welding and blocking phenomena of the pipelines are caused.
2. The temperature difference between a front liquid pipe and a rear liquid pipe of a started indoor unit and a coil pipe delta T1 and delta T2 is unchanged, the temperature difference between the liquid pipe of the indoor unit of the certain unit which is not started and the temperature difference delta T1 'and delta T2' of the coil pipe are changed to meet the requirement of the temperature difference, the indoor unit of the unit which is started and the indoor unit which is not started are judged to be reversely connected, and the installation of an online line and the online pipe is not correspondingly reversely connected when the unit is installed; when in production, the electronic expansion valve is inserted into a pipeline which does not correspond to the electronic expansion valve, and the like, and the online signals of the two machines and the signals of the electronic expansion valve can be manually checked and repaired or the general MCU program can be intelligently repaired to exchange.
3. The method comprises the steps that the difference between the temperature of a liquid pipe delta T1 before and after the indoor unit is started is not changed, the difference between the temperature of a coil pipe delta T2 meets requirements, the difference between the temperature of a liquid pipe delta T1 'in a certain platform which is not started is met and the difference between the temperature of a liquid pipe delta T2' in the platform which is not started is not changed, the signals of the indoor unit which is started and the signals of the indoor unit which is not started are reversed, the problems that the liquid pipe temperature sensors are reversely inserted on a control board in production or a sensor temperature sensing head is installed on the corresponding indoor unit exist, manual inspection and repair can be carried out, or a general MCU program is intelligently repaired.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (7)
1. A self-checking method of a multi-pipe system variable frequency one-driving-multiple air conditioner is characterized by comprising the following steps:
calculating self-checking operation parameters, comprising:
calculating the frequency of a press corresponding to the self-checking operation of each indoor unit on line;
calculating the opening degree of an electronic expansion valve corresponding to the self-checking operation of each indoor unit of the on-line system;
the self-checking step comprises the following steps:
(1) controlling to enter a self-checking mode;
（2）the indoor units of the on-line machine are forcibly started and run for a set time in sequence, at most one indoor unit runs at any moment, and the liquid pipe temperature T of each indoor unit is detected before the indoor units are startedliqAnd coil temperature Tcoil(ii) a Searching the frequency of a compressor and the opening of the electronic expansion valve corresponding to the self-checking operation of the indoor unit, and controlling the operation of the compressor and the opening of the electronic expansion valve according to the frequency and the opening after the indoor unit is started;
(3) detecting the current outdoor environment temperature, finding out the current corresponding outdoor unit wind speed from a press frequency-outdoor environment temperature lookup table, and controlling an outdoor fan according to the current corresponding outdoor unit wind speed after the outdoor unit wind speed is started;
(4) after the machine is started, the air speed of the indoor unit is operated according to low wind;
(5) and detecting the liquid pipe temperature T 'of the currently operated indoor unit after the indoor unit operates for the set time'liqAnd coil temperature T'coil；
(6) Calculating the temperature difference △ T1 of the liquid tube temperature before and after the indoor unit is started and the temperature difference △ T2 of the coil temperature,
△ T1= T'liq-Tliq︳；
△T2=︳T’coil-Tcoil︳；
(7) Comparing △ T1 and △ T2 with set thresholds respectively, if △ T1 and △ T2 are both larger than the set thresholds, judging that the indoor unit is normal, and otherwise, judging that the indoor unit is abnormal;
(8) and displaying the judgment result.
2. The multi-pipe system frequency conversion one-driving-multiple air conditioner self-checking method according to claim 1, wherein in the step of calculating the self-checking operation parameters, the method for calculating the press frequency Fr corresponding to the self-checking operation of the indoor unit comprises the following steps:
Fr=Kf×Capin+B；
wherein Kf is a frequency calculation coefficient;
the Capin is the capacity code of the indoor unit and is pre-stored in the program of the indoor unit,
capin = indoor unit refrigerating capacity/100, B is frequency calculation intercept, and Kf and B are constants.
3. The multi-pipe system variable frequency one-drive-multiple air conditioner self-checking method according to claim 1, wherein in the step of calculating the self-checking operation parameters, the method for calculating the opening Fk of the electronic expansion valve corresponding to the self-checking operation of the indoor unit comprises:
Fk =Fr×Kfk ×[1+（Tin－27）×Kin+（Tout－35）×Kout）]；
wherein Kfk is the frequency opening coefficient, Tin is the indoor ambient temperature of the currently operating indoor unit, Kin is the indoor ambient temperature coefficient of the currently operating indoor unit, Tout is the outdoor ambient temperature of the outdoor unit,
kout is the outdoor ambient temperature coefficient of the outdoor unit, Tin and Tout are respectively acquired by corresponding ambient temperature sensors, and Kfk, Kin and Kout are constant values.
4. The multi-pipe system frequency conversion multi-air conditioner self-checking method according to claim 1, wherein after entering the self-checking mode in step (1), the method further comprises the steps of firstly detecting whether the communication with each indoor unit chip, each outdoor drive chip and each outdoor EE memory chip is normal, detecting whether each temperature sensor, each direct current motor, each compressor thermal protector and each pressure switch have an open circuit or a short circuit, and the like, and if the communication has a fault, reporting the fault to be repaired and then entering the next step.
5. The multi-pipe frequency conversion multi-split air conditioner self-checking method according to any one of claims 1 to 4, wherein the method for controlling the entering into the self-checking mode in the step (1) comprises:
a. controlling the indoor unit to send a self-checking mode signal to an outdoor unit main control chip through an indoor unit remote controller, and enabling the outdoor unit to forcibly enter a self-checking mode;
or,
b. the outdoor unit is forced to enter a self-checking mode by operating a digital tube control key on the outdoor unit main control panel and sending a self-checking mode signal to the outdoor unit main control chip.
6. The multi-pipe system frequency conversion multi-split air conditioner self-checking method according to any one of claims 1 to 4, wherein in the step (3), the press frequency-outdoor ambient temperature lookup table is: the method comprises the steps that the outdoor environment temperature is divided into M +1 temperature intervals by adopting M temperature values, the press frequency is divided into N +1 frequency intervals by adopting N frequency points, the air speed of an outdoor unit is uniquely determined by each temperature interval and each frequency interval, the outdoor unit searches the rotating speed of an outdoor fan in the corresponding interval according to the collected outdoor environment temperature and the calculated press frequency during self-checking, wherein M, N is a positive integer.
7. The multi-pipe system frequency conversion one-drive-multiple air conditioner self-checking method according to any one of claims 1 to 4, wherein in the step (7), when the △ T1 and △ T2 of the current indoor unit are judged to be abnormal, the temperature difference △ T1 'of the liquid pipe temperatures and △ T2' of the coil temperatures of other indoor units which are not started before and after the current indoor unit is started are calculated, △ T1 'and △ T2' are respectively compared with the set threshold, and if △ T1 'and/or △ T2' are/is greater than the set threshold, the indoor unit is judged to have the failure of reverse connection of the electronic expansion valve or reverse connection of the online signal with the current indoor unit.
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