CN110686358B - Variable frequency air conditioner fault diagnosis method based on detection tool - Google Patents
Variable frequency air conditioner fault diagnosis method based on detection tool Download PDFInfo
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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
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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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
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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Abstract
The frequency conversion air conditioner fault diagnosis method based on the detection tool comprises the following steps: the detection tool is connected in series between the indoor unit and the outdoor unit; judging the power state; if the indoor unit of the air conditioner is powered on, starting a detection period; if the air conditioner outdoor unit is electrified, the first protection period timer starts to time, when the timing time of the first protection period timer is equal to the set protection period, the microprocessor outputs an enabling signal, and the detection period starts. The detection tool receives command data sent by the master device, forwards the received command data to the slave device, and if response data are not received within a first effective preset value, the communication fault of the slave device is judged; if response data fed back by the slave equipment are received, judging that the communication is normal; and if the detection tool does not receive the command data sent by the master equipment, sending test data to the slave equipment, and if response data are received in the second effective preset value, determining that the master equipment has a communication fault. The invention has the advantage of low misjudgment rate.
Description
Technical Field
The invention relates to the technical field of air conditioning equipment, in particular to a fault diagnosis method for a variable frequency air conditioner.
Background
The communication fault of the variable frequency air conditioner is a common circuit fault, when a communication circuit part has a fault, various control instructions of the air conditioner cannot be transmitted, and various functions of the air conditioner cannot be normally completed. The communication circuit fault is directly embodied by the following steps: the whole air conditioner cannot be started, the outdoor unit does not work, and the whole air conditioner is protected when the air conditioner is started. In the prior art, the inverter air conditioner generally has a fault code display, and once a communication circuit has a fault, the air conditioner can display a corresponding fault code.
In a common variable frequency air conditioner, a power supply relay is arranged at one end of an indoor unit. When the indoor unit receives a control signal in an infrared or remote communication mode, the power supply relay is closed, the air conditioner is integrally electrified, the indoor unit and the outdoor unit of the air conditioner automatically communicate according to a set protocol, and the indoor unit sends a signal to the outdoor unit or the outdoor unit sends a signal to the indoor unit. One side waits for receiving after sending the signal, if the signal sent by the other side can not be received, an error alarm is given. Aiming at similar communication faults, a standby indoor unit main board and an outdoor unit main board are connected with an outdoor unit or an indoor unit of an air conditioner for testing in the prior art, and a power supply relay is arranged in the indoor unit, so that the time sequence of asynchronous communication can be accurately controlled during testing, and the testing precision is ensured. However, in the prior art, there is also a variable frequency air conditioner, in which the indoor unit is not provided with a power relay, but after the outdoor unit is powered on, the whole air conditioner is powered on. Under the condition, the time sequence of asynchronous communication is not easy to be controlled, the phenomenon of misjudgment is easy to occur, and the detection workload is increased.
Disclosure of Invention
The invention provides a fault diagnosis method for a variable frequency air conditioner, and aims to solve the problems that in the prior art, when a communication fault is determined by replacing a standby circuit board with a similar communication interface, the time sequence of asynchronous communication is not easy to control, and the detection precision is low.
The invention relates to a fault diagnosis method of a variable frequency air conditioner based on a detection tool, which comprises the following steps of:
connecting a detection tool between an indoor unit and an outdoor unit of an air conditioner in series;
the detection tool judges the power state of the air conditioner;
if the indoor unit of the air conditioner is powered on, a detection period starts; if the air conditioner outdoor unit is electrified, the microprocessor in the detection tool controls a first protection period timer in the detection tool to start timing, and when the timing time of the first protection period timer is equal to a set protection period, the microprocessor outputs an enable signal and the detection period starts;
in the detection period, if the detection tool receives command data sent by the master device, the received command data are forwarded to the slave device, meanwhile, a first timer in the detection tool starts timing, and if the first timer is at a first effective preset value T of the first timer1If the response data fed back by the slave equipment is not received, the communication fault of the slave equipment is judged; if at the first valid preset value T of the first timer1If response data fed back by the slave equipment is received, judging that the communication is normal;
if the detection tool does not receive command data sent by the master equipment, sending test data to the slave equipment, detecting a first timer in the tool to start timing, and if the first timer is at a second effective preset value T of the first timer2And if response data fed back by the slave equipment is received, judging that the communication fault of the master equipment exists.
Further optionally, the method further comprises the following steps:
if the indoor unit of the air conditioner is powered on, the detection tool firstly judges whether the air conditioner works in a power-down memory mode;
if the air conditioner works in a power-down memory mode, the microprocessor in the detection tool controls a second protection period timer in the detection tool to start timing, and when the timing time of the second protection period timer is equal to a second set protection period, the microprocessor outputs an enable signal and the detection period starts; if the air conditioner is not operating in the power-down memory mode, the detection cycle begins.
Further, after the air conditioner is powered on, the detection tool detects and determines the master-slave identities of the indoor unit and the outdoor unit according to the received authentication data, and the method comprises the following steps:
detecting a second timer in the tool to start timing;
s101, if the first verification preset value T of the second timer is int1In, detect the body that the frock received the indoor set and sentIf the authentication data or the received authentication data sent by the outdoor unit, the indoor unit is judged to be the main equipment, the outdoor unit is the slave equipment, and the detection tool judges the type of the communication protocol according to the authentication data;
s102, if the second verification preset value T of the second timer is in the second verification preset value T of the second timert2If the detection tool does not receive the authentication data sent by the indoor unit and does not receive the authentication data sent by the outdoor unit, the indoor unit is judged to be the slave unit, the outdoor unit is judged to be the master unit, and T ist2 > Tt1。
Further, step S101 includes:
presetting a value T in the verification period of the second timert3In the detection tool, a microprocessor monitors whether a first communication interface receives authentication data sent by an indoor unit, wherein T ist3< Tt1：
If the preset value T is set in the verification periodt3If the authentication data sent by the indoor unit is received, the indoor unit is judged to be a master device, the outdoor unit is judged to be a slave device, and the detection tool judges the type of the communication protocol according to the authentication data;
if the preset value T is set in the verification periodt3If the identity verification data fed back by the outdoor unit is received, the indoor unit is judged to be a main device, the outdoor unit is judged to be a slave device, and the detection tool judges the type of the communication protocol according to the identity verification data.
Further, if the indoor unit is determined as a master device and the outdoor unit is determined as a slave device according to the authentication data received by the first communication interface, the detection period includes the following steps:
the microprocessor of the detection tool forwards the command data received from the first communication interface to the outdoor unit through the second communication interface, and if the command data is in the first effective preset value T1If the response data fed back by the outdoor unit is not received, the outdoor unit is judged to be in fault, and a detector detects the faultDisplaying a corresponding fault code;
if at the first valid preset value T1And if response data fed back by the outdoor unit are received, judging that the communication is normal, and displaying a corresponding communication code by the detection tool.
Further, if the indoor unit is determined as the master device and the outdoor unit is determined as the slave device according to the authentication data received by the second communication interface, the detection period includes the following steps:
the microprocessor of the detection tool generates test data and sends the test data to the outdoor unit through the second communication interface, and if the test data is at a second effective preset value T2If response data fed back by the outdoor unit is received, the preset time T of the fault is reached in timings1And then displaying the communication code of the communication fault of the indoor unit.
Further, if it is determined that the outdoor unit is a master device and the indoor unit is a slave device, the detection period includes:
the microprocessor of the detection tool monitors whether the second communication interface receives command data sent by the outdoor unit:
s201, if command data are received, the microprocessor of the detection tool forwards the command data to the indoor unit and monitors a first effective preset value T of the first communication interface in the first timer1Whether response data fed back by the indoor unit is received or not is judged, if the response data are received, the communication is judged to be normal, if the response data are not received, the communication fault of the indoor unit is judged, and the communication code of the communication fault of the indoor unit is displayed;
s202, if the command data are not received, the microprocessor of the detection tool generates test data and sends the test data to the indoor unit through the first communication interface, and monitors the first effective preset value T of the first communication interface in the first timer1And if the response data is received, judging that the outdoor unit has a communication fault, and displaying a communication code of the communication fault of the outdoor unit.
Further, in step S201, the first valid preset value T1Comprises at least one first preset period Tp1Micro of the detection toolThe processor is in each first preset period Tp1The command data is forwarded to the indoor unit once, and the first communication interface is monitored in each first preset period Tp1And meanwhile, a microprocessor of the detection tool outputs a starting control signal to the outdoor unit through a second communication interface to drive the outdoor unit to start and keep a working state.
And further. In step S201, if no response data fed back by the indoor unit is received, the microprocessor of the detection tool generates a setting command signal and outputs the setting command signal to the indoor unit through the second communication interface, determines whether the indoor unit executes an action corresponding to the setting command signal, and if the indoor unit does not respond, determines that the indoor unit has a communication failure, and displays a communication code of the communication failure of the indoor unit.
Further, in step S202, if no response data fed back by the indoor unit is received, the microprocessor of the detection tool generates a setting command signal and sets a second preset period T for each set timep2Sending a setting command signal to the indoor unit through the first communication interface, if the setting command signal is within a plurality of second preset periods Tp2If the indoor units do not respond, judging that the indoor unit has communication faults, and displaying communication codes of the indoor unit communication faults; t isp2> Tp1。
According to the control method of the variable-frequency air conditioner based on the detection tool, disclosed by the invention, the detection tool connected between the indoor unit and the outdoor unit in series is utilized, and the communication time sequence of the detection tool in the detection period is ensured to be matched with the communication time sequence of the air conditioner according to the power state of the air conditioner, so that the influence of communication delay caused by the power state on the detection precision is avoided. The variable frequency air conditioner control method based on the detection tool has the advantages of high detection precision and flexible use.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flowchart of a first embodiment of a method for diagnosing faults of an inverter air conditioner based on a detection tool disclosed by the invention;
fig. 2 is a flowchart of a method for diagnosing a fault of an inverter air conditioner based on a detection tool according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present 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.
Fig. 1 is a flowchart illustrating a method for diagnosing a fault of an inverter air conditioner based on a detection tool according to a specific embodiment of the present invention. As shown in fig. 1, the method comprises the following steps:
firstly, the detection tool is connected in series between an indoor unit and an outdoor unit of an air conditioner. A first communication interface matched with the indoor unit and a second communication interface matched with the outdoor unit are arranged in the detection tool. The first communication interface is connected with the indoor unit through a signal line, and the second communication interface is connected with the outdoor unit through a signal line. And a microprocessor in the detection tool controls the first communication interface and the second communication interface. The first communication interface and the second communication interface may communicate under control of the microprocessor during the fault diagnosis. The microprocessor is preferably a single-chip microcomputer, and can also be other integrated chips or integrated circuits with similar functions. The type is not particularly limited.
Because the air conditioner has a plurality of power states, as mentioned above, the indoor unit is powered on or the outdoor unit is powered on, that is, the power supply is arranged at one side of the indoor unit or at one side of the outdoor unit to supply power to the whole air conditioner. Therefore, in this embodiment, the detection tool connected in series between the indoor unit and the outdoor unit of the air conditioner first determines the power state of the air conditioner. Specifically, it is an alternative that if the first communication interface receives a level signal of a transition, it is determined that the indoor unit of the air conditioner is powered on, and if the second communication interface receives a level signal of a transition, it is determined that the outdoor unit of the air conditioner is powered on. The power state of the air conditioner can also be obtained through other electric signal sampling circuits, which are not limited herein.
And if the judgment result is that the air conditioner indoor unit is electrified, the closing time of a power supply relay in the indoor unit is the starting time of the asynchronous communication of the detection tool. The detection tool can judge the specific position of the communication fault according to the flow of the established communication protocol, and the detection period starts. If the judgment result is that the air conditioner outdoor unit is electrified, the transmission of normal communication data of the air conditioner has obvious time delay. The detection tool follows the flow judgment of a set communication protocol, and the time delay of communication data can interfere with a clock signal of the detection tool, so that an error occurs in the judgment result of the detection tool. To avoid this, in the fault diagnosis method disclosed in this embodiment, when it is determined that the outdoor unit of the air conditioner is powered on, the microprocessor controls the first protection cycle timer to start timing. The first protection period timer stores a preset first protection period. The first set protection period is preferably obtained by a skilled person through extensive experimentation. When the timing time of the first protection period timer is equal to the first set protection period, the microprocessor outputs an enable signal, and the detection period starts. By setting the protection period timer, the clock signal of the detection period can be matched with the original communication clock signal of the air conditioner under the power supply state of the outdoor unit, and the detection precision is improved.
According to a given communication protocol, one of the air conditioner indoor unit and the air conditioner outdoor unit is a master device, and the other is a slave device. In the detection period, if the detection tool receives command data sent by the master equipment, the received command data is forwardedTo the slave device. Simultaneously detecting a first timer in the tool to start timing, and if the first timer is at a first effective preset value T1If the response data fed back by the slave device is not received, the slave device is determined to have communication failure. If the first valid preset value T of the first timer is reached1If the response data fed back by the slave device is not received, the slave device is determined to have communication failure. If the first valid preset value T of the first timer is reached1And if response data fed back from the equipment is received, judging that the communication is normal.
In the detection period, if the detection tool does not receive command data sent by the master device, the microprocessor generates and sends test data to the slave device, and meanwhile, a first timer in the detection tool starts timing. If the second valid preset value T of the first timer is reached2And if response data fed back by the slave equipment is received, judging that the communication fault of the master equipment exists.
Through the mode, maintenance personnel can effectively and rapidly diagnose the specific position of the communication fault of the air conditioner by utilizing the detection tool, and the detection precision and the detection efficiency are obviously improved.
In the prior art, a part of air conditioners powered on indoors are provided with a power-down memory mode, specifically, the last control instruction of the air conditioner is stored in an EEPROM. After the air conditioner is powered on, the air conditioner does not wait for receiving the instruction of the remote controller, but directly reads the last operation parameter in the EEPROM and directly operates according to the last operation parameter. In this mode, the timing of asynchronous communication may also change or fluctuate, and if the detection tool performs failure diagnosis during the fluctuation, it may cause erroneous determination due to the timing being out of synchronization. Therefore, as shown in fig. 2, in another embodiment of the present invention, for an air conditioner with a power-down memory mode, a detection tool performs the following steps:
if the indoor unit of the air conditioner is powered on, the detection tool firstly judges whether the air conditioner works in a power-down memory mode, if the air conditioner works in the power-down memory mode, a microprocessor in the detection tool controls a second protection period timer in the detection tool to start timing, and when the timing time of the second protection period timer is equal to a second set protection period, the microprocessor outputs an enable signal and the detection period starts. If the air conditioner is not operating in the power-down memory mode, the detection cycle begins. The second protection period is also determined by the skilled person on the basis of a number of experiments. Therefore, even if part of the air conditioners work in a power failure memory mode when being powered on, the communication time sequence of the detection tool working in the detection period can be matched with the air conditioners, and the positions of fault points can be accurately determined.
Different communication protocols can be set when the air conditioner leaves a factory due to different models of the air conditioner, and the communication protocols basically belong to asynchronous half-duplex communication protocols, and the main difference is that the identities of master equipment and slave equipment are different during communication. In order to match with different communication protocols, after the air conditioner is powered on, the detection tool automatically detects and determines the master-slave identities of the indoor unit and the outdoor unit according to the received identity verification data. Specifically, the method comprises the following steps:
and after the air conditioner is powered on, a second timer in the detection tool starts timing.
For one of the cases, as shown in step S101, if the first verification preset value T is at the second timert1And if the detection tool receives the authentication data sent by the indoor unit or the authentication data sent by the outdoor unit, the indoor unit is judged to be the main equipment, the outdoor unit is judged to be the slave equipment, and the detection tool judges the type of the communication protocol according to the authentication data. The authentication data conforms to the definition of the communication protocol and preferably consists of 16 bytes, each consisting of a set of 8-bit binary codes. Other data structures may be similar. More specifically, the second timer is further provided with a verification period preset value Tt3. Presetting value T in verification period of second timert3And the microprocessor of the detection tool monitors whether the first communication interface receives the authentication data sent by the indoor unit. Wherein T ist3< Tt1. If the preset value T is set in the verification periodt3If the authentication data sent by the indoor unit is received, the indoor unit is judged to be the master device, and the outdoor unit is judged to be the slave deviceAnd the detection tool judges the type of the communication protocol according to the authentication data. If the preset value T is set in the verification periodt3If the identity verification data fed back by the outdoor unit is received, the indoor unit is judged to be a main device, the outdoor unit is judged to be a slave device, and the detection tool judges the type of the communication protocol according to the identity verification data.
For another case, as step S102, if the second verification preset value T is at the second timert2If the detection tool does not receive the authentication data sent by the indoor unit and does not receive the authentication data sent by the outdoor unit, the indoor unit is judged to be the slave unit, the outdoor unit is judged to be the master unit, and T ist2 > Tt1. Wherein.
Preferably, a first verification preset value T is sett1Is 7s, the second verification preset value Tt2Is 15 s.
If the indoor unit is judged to be the main equipment and the outdoor unit is judged to be the slave equipment according to the authentication data received by the first communication interface, the detection tool executes the following steps in the detection period:
the microprocessor of the detection tool forwards the command data received from the first communication interface to the outdoor unit through the second communication interface, and if the command data is in the first effective preset value T1And if the response data fed back by the outdoor unit is not received, judging that the outdoor unit is in failure, and displaying a corresponding failure code by the detection tool.
If at the first valid preset value T1And if response data fed back outdoors are received, judging that the communication is normal, and displaying a communication code corresponding to the normal communication by the detection tool. Therefore, maintenance personnel can accurately find the fault point and carry out further maintenance.
In another case, if the indoor unit is determined as the master device and the outdoor unit is determined as the slave device according to the authentication data received by the second communication interface, the detection tool executes the following steps in the detection period:
the microprocessor of the detection tool generates test data and sends the test data to the outdoor unit through the second communication interface, and if the test data is at a second effective preset value T2If response data fed back by the outdoor unit is received, the preset time T of the fault is reached in timings1And then displaying the communication code of the communication fault of the indoor unit.
And if the outdoor unit is judged to be the main equipment and the indoor unit is judged to be the slave equipment, the detection tool executes the following steps in the detection period:
the microprocessor of the detection tool monitors whether the second communication interface receives command data sent by the outdoor unit, and the two conditions are divided into two conditions:
s201, if command data are received, the microprocessor of the detection tool forwards the command data to the indoor unit and monitors a first effective preset value T of the first communication interface in the first timer1And if the response data fed back by the indoor unit is received, judging that the communication is normal. And if the response data is not received, determining that the communication of the indoor unit is failed. And the detection tool displays the communication code of the communication fault of the indoor unit.
Preferably, in the above step, at the first valid preset value T1In which a plurality of first preset periods T are setp1The microprocessor of the detection tool is arranged in each first preset period Tp1The command data is forwarded to the indoor unit once, and the first communication interface is monitored in each first preset period Tp1And if the response data fed back by the indoor unit are not received, judging that the communication fault of the indoor unit occurs. And if the response data is received within a preset period, stopping forwarding the command data. When the communication fault of the indoor unit is judged, the microprocessor of the detection tool outputs a starting control signal to the outdoor unit through the second communication interface, drives the outdoor unit to start and keeps a working state, so that fault troubleshooting is performed on each component in the outdoor unit and a connecting circuit between the outdoor unit main board and each component.
For another case, e.g. S202, e.g.If the command data is not received, the microprocessor of the detection tool generates test data and sends the test data to the indoor unit through the first communication interface, and monitors the first effective preset value T of the first communication interface in the first timer1And if the response data is received, judging that the outdoor unit has a communication fault, and displaying a communication code of the communication fault of the outdoor unit.
Preferably, if the response data fed back by the indoor unit is not received, the microprocessor of the detection tool generates a set command signal and sets the set command signal in each second preset period Tp2Sending a setting command signal to the indoor unit through the first communication interface, if the setting command signal is within a plurality of second preset periods Tp2If the indoor units do not respond, judging that the indoor unit has communication faults, and displaying communication codes of the indoor unit communication faults; t isp2> Tp1. Multiple transmissions in succession may reduce the probability of detection errors occurring. Similarly, if the response data fed back by the indoor unit is not received, the microprocessor of the detection tool generates a setting command signal and outputs the setting command signal to the indoor unit through the second communication interface, whether the indoor unit executes the action corresponding to the setting command signal or not is judged, if the indoor unit does not respond, the communication fault of the indoor unit is judged, and the communication code of the communication fault of the indoor unit is displayed.
According to the control method of the variable-frequency air conditioner based on the detection tool, disclosed by the invention, the detection tool connected between the indoor unit and the outdoor unit in series is utilized, and the communication time sequence of the detection tool in the detection period is ensured to be matched with the communication time sequence of the air conditioner according to the power state of the air conditioner, so that the influence of communication delay caused by the power state on the detection precision is avoided. The variable frequency air conditioner control method based on the detection tool has the advantages of high detection precision and flexible use.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A frequency conversion air conditioner fault diagnosis method based on a detection tool is characterized in that: the method comprises the following steps:
connecting a detection tool between an indoor unit and an outdoor unit of an air conditioner in series;
the detection tool judges the power state of the air conditioner;
if the indoor unit of the air conditioner is powered on, a detection period starts; if the air conditioner outdoor unit is electrified, the microprocessor in the detection tool controls a first protection period timer in the detection tool to start timing, and when the timing time of the first protection period timer is equal to a set protection period, the microprocessor outputs an enable signal and the detection period starts;
in the detection period, if the detection tool receives command data sent by the master device, the received command data are forwarded to the slave device, meanwhile, a first timer in the detection tool starts timing, and if the first timer is at a first effective preset value T of the first timer1If the response data fed back by the slave equipment is not received, the communication fault of the slave equipment is judged; if at the first valid preset value T of the first timer1If response data fed back by the slave equipment is received, judging that the communication is normal;
if the detection tool does not receive command data sent by the master equipment, sending test data to the slave equipment, and simultaneously detecting a first timer in the tool to start timing, if the first timer is in the second timeA second effective preset value T of a timer2If response data fed back by the slave equipment is received, judging that the communication fault of the master equipment is generated;
after the air conditioner is powered on, the detection tool detects and determines the master-slave identities of the indoor unit and the outdoor unit according to the received authentication data, and the method comprises the following steps:
detecting a second timer in the tool to start timing;
s101, if the first verification preset value T of the second timer is int1If the detection tool receives authentication data sent by the indoor unit or receives authentication data sent by the outdoor unit, the indoor unit is judged to be a main device, the outdoor unit is judged to be a slave device, and the detection tool judges the type of the communication protocol according to the authentication data;
s102, if the second verification preset value T of the second timer is in the second verification preset value T of the second timert2If the detection tool does not receive the authentication data sent by the indoor unit and does not receive the authentication data sent by the outdoor unit, the indoor unit is judged to be the slave unit, the outdoor unit is judged to be the master unit, and T ist2 > Tt1。
2. The variable frequency air conditioner fault diagnosis method based on the detection tool as claimed in claim 1, further comprising the following steps:
if the indoor unit of the air conditioner is powered on, the detection tool firstly judges whether the air conditioner works in a power-down memory mode;
if the air conditioner works in a power-down memory mode, the microprocessor in the detection tool controls a second protection period timer in the detection tool to start timing, and when the timing time of the second protection period timer is equal to a second set protection period, the microprocessor outputs an enable signal and the detection period starts; if the air conditioner is not operating in the power-down memory mode, the detection cycle begins.
3. The variable frequency air conditioner fault diagnosis method based on the detection tool as claimed in claim 2, wherein:
step S101 includes:
presetting a value T in the verification period of the second timert3In the detection tool, a microprocessor monitors whether a first communication interface receives authentication data sent by an indoor unit, wherein T ist3< Tt1：
If the preset value T is set in the verification periodt3If the authentication data sent by the indoor unit is received, the indoor unit is judged to be a master device, the outdoor unit is judged to be a slave device, and the detection tool judges the type of the communication protocol according to the authentication data;
if the preset value T is set in the verification periodt3If the identity verification data fed back by the outdoor unit is received, the indoor unit is judged to be a main device, the outdoor unit is judged to be a slave device, and the detection tool judges the type of the communication protocol according to the identity verification data.
4. The variable frequency air conditioner fault diagnosis method based on the detection tool as claimed in claim 3, wherein:
if the indoor unit is judged to be the main equipment and the outdoor unit is judged to be the slave equipment according to the authentication data received by the first communication interface, the detection period comprises the following steps:
the microprocessor of the detection tool forwards the command data received from the first communication interface to the outdoor unit through the second communication interface, and if the command data is in the first effective preset value T1If response data fed back by the outdoor unit are not received, the outdoor unit is judged to be in fault, and the detection tool displays a corresponding fault code;
if at the first valid preset value T1And if response data fed back by the outdoor unit are received, judging that the communication is normal, and displaying a corresponding communication code by the detection tool.
5. The variable frequency air conditioner fault diagnosis method based on the detection tool as claimed in claim 4, wherein:
if the indoor unit is judged to be the main equipment and the outdoor unit is judged to be the slave equipment according to the authentication data received by the second communication interface, the detection period comprises the following steps:
the microprocessor of the detection tool generates test data and sends the test data to the outdoor unit through the second communication interface, and if the test data is at a second effective preset value T2If response data fed back by the outdoor unit is received, the preset time T of the fault is reached in timings1And then displaying the communication code of the communication fault of the indoor unit.
6. The variable frequency air conditioner fault diagnosis method based on the detection tool as claimed in claim 5, wherein:
if the outdoor unit is judged to be the master device, and the indoor unit is judged to be the slave device, the detection period comprises the following steps:
the microprocessor of the detection tool monitors whether the second communication interface receives command data sent by the outdoor unit:
s201, if command data are received, the microprocessor of the detection tool forwards the command data to the indoor unit and monitors a first effective preset value T of the first communication interface in the first timer1Whether response data fed back by the indoor unit is received or not is judged, if the response data are received, the communication is judged to be normal, if the response data are not received, the communication fault of the indoor unit is judged, and the communication code of the communication fault of the indoor unit is displayed;
s202, if the command data are not received, the microprocessor of the detection tool generates test data and sends the test data to the indoor unit through the first communication interface, and monitors the first effective preset value T of the first communication interface in the first timer1And if the response data is received, judging that the outdoor unit has a communication fault, and displaying a communication code of the communication fault of the outdoor unit.
7. The variable frequency air conditioner fault diagnosis method based on the detection tool as claimed in claim 6, wherein:
in step S201, the first stepAn effective default value T1Comprises at least one first preset period Tp1Detecting the microprocessor of the tool in each first preset period Tp1The command data is forwarded to the indoor unit once, and the first communication interface is monitored in each first preset period Tp1And meanwhile, a microprocessor of the detection tool outputs a starting control signal to the outdoor unit through a second communication interface to drive the outdoor unit to start and keep a working state.
8. The variable frequency air conditioner fault diagnosis method based on the detection tool according to claim 7, characterized in that:
in step S201, if no response data fed back by the indoor unit is received, the microprocessor of the detection tool generates a setting command signal and outputs the setting command signal to the indoor unit through the second communication interface, determines whether the indoor unit executes an action corresponding to the setting command signal, and if the indoor unit does not respond, determines that the indoor unit has a communication failure, and displays a communication code of the communication failure of the indoor unit.
9. The variable frequency air conditioner fault diagnosis method based on the detection tool according to claim 8, characterized in that:
in step S202, if no response data fed back by the indoor unit is received, the microprocessor of the detection tool generates a setting command signal and sets a second preset period T for each set of command signalsp2Sending a setting command signal to the indoor unit through the first communication interface, if the setting command signal is within a plurality of second preset periods Tp2If the indoor units do not respond, judging that the indoor unit has communication faults, and displaying communication codes of the indoor unit communication faults; t isp2> Tp1。
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