CN111023440A - Air conditioner low-voltage sensor fault detection method and device and air conditioner - Google Patents
Air conditioner low-voltage sensor fault detection method and device and air conditioner Download PDFInfo
- Publication number
- CN111023440A CN111023440A CN201911315054.6A CN201911315054A CN111023440A CN 111023440 A CN111023440 A CN 111023440A CN 201911315054 A CN201911315054 A CN 201911315054A CN 111023440 A CN111023440 A CN 111023440A
- Authority
- CN
- China
- Prior art keywords
- air conditioner
- low
- fault
- value
- difference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- 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
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Signal Processing (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a method and a device for detecting faults of a low-pressure sensor of an air conditioner and the air conditioner. The method comprises the following steps: when the air conditioner is shut down, determining a first difference value between a low-pressure value and a high-pressure value of the air conditioner, and pre-detecting faults of a low-pressure sensor of the air conditioner according to the first difference value and a first duration time for which the first difference value is greater than a first threshold value; judging whether to detect the fault again when the air conditioner operates according to a pre-detection result; if so, when the air conditioner is operated, determining that the temperature information of the low-pressure end of the air conditioner is lower than a second difference value of the saturation temperature corresponding to the low-pressure value, and re-detecting the fault according to the second difference value and a second duration time when the second difference value is larger than a second threshold value. The fault detection of the air conditioner low-voltage sensor is realized, and the use requirements of users are better met.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method and a device for detecting faults of a low-pressure sensor of an air conditioner and the air conditioner.
Background
With the continuous improvement of living standard, more and more household appliances enter the daily life and work of people. The household electrical appliance takes an air conditioner as an example, and the air conditioner provides a cooling or heating effect through heat exchange so as to provide a comfortable indoor environment.
The air conditioner low pressure sensor plays an important role in normal operation of the air conditioner, and if the air conditioner low pressure sensor fails, for example, the low pressure sensor detects that the low pressure is abnormal (higher), the output or reliability of the whole system may be affected. Specifically, the refrigeration of the air conditioner generally controls the output by a low pressure value, and when the low pressure value is greater than a target value, the refrigeration output of the air conditioner compressor is increased, and when the low pressure value is less than the target value, the refrigeration output of the air conditioner compressor is decreased. When the low-pressure sensor of the air conditioner fails, for example, the low-pressure sensor detects that the low-pressure value is higher, at the moment, the output of the air conditioner compressor is still increased under the condition that the temperature of the internal machine pipe reaches the target value, and the control is invalid. Fault detection of the air conditioner low pressure sensor is particularly important.
At present, fault detection aiming at the air conditioner low-voltage sensor does not exist, and the use requirement of a user cannot be well met.
Disclosure of Invention
The invention solves the problem of how to detect the fault of the low-pressure sensor of the air conditioner, thereby better meeting the use requirement of users.
In order to solve the above problems, an aspect of the present invention provides a method for detecting a fault of a low-pressure sensor of an air conditioner, including: when the air conditioner is shut down, determining a first difference value between a low-pressure value and a high-pressure value of the air conditioner, and pre-detecting the fault of the low-pressure sensor of the air conditioner according to the first difference value and a first duration time of which the first difference value is greater than a first threshold value; judging whether to detect the fault again when the air conditioner operates according to the pre-detection result; if so, when the air conditioner is operated, determining that the temperature information of the low-pressure end of the air conditioner is lower than a second difference value of the saturation temperature corresponding to the low-pressure value, and re-detecting the fault according to the second difference value and a second duration time when the second difference value is larger than a second threshold value.
Therefore, by performing the preliminary detection at the time of the shutdown, it is preliminarily determined whether or not there is a pressure abnormality, which may be caused by the low pressure sensor or the high pressure sensor, based on the first difference and the first duration. And then, when the air conditioner runs, the low-pressure sensor is detected again, and whether the low-pressure sensor fails or not is judged according to the second difference value and the second duration.
Optionally, in the air-conditioning cooling mode, the temperature information of the low-pressure end of the air conditioner includes an internal unit coil temperature and a compressor suction temperature.
Further, the re-detecting the fault according to the second difference and a second duration that the second difference is greater than a second threshold includes: if the difference value of the temperature of the coil of the inner machine unit lower than the saturation temperature is larger than a second threshold value, and the second duration time is larger than a time threshold value; meanwhile, the difference that the compressor suction temperature is lower than the saturation temperature is larger than a second threshold, and the second duration is larger than a time threshold; determining that the fault of the air conditioner low-pressure sensor is that the low-pressure sensor is abnormally high.
Optionally, in the air-conditioning heating mode, the temperature information of the low-pressure end of the air conditioner comprises the inlet temperature of the gas-liquid separator and the suction temperature of the compressor.
Further, the re-detecting the fault according to the second difference and a second duration that the second difference is greater than a second threshold includes: if the inlet temperature of the gas-liquid separator is lower than the saturation temperature by a difference value larger than a second threshold value, and the second duration is larger than a time threshold value; meanwhile, the difference that the compressor suction temperature is lower than the saturation temperature is larger than a second threshold, and the second duration is larger than a time threshold; determining that the fault of the air conditioner low-pressure sensor is that the low-pressure sensor is abnormally high.
Therefore, according to the two different modes of the air conditioner during operation, the temperature information of the low-pressure end of the air conditioner is selected, the temperature information is effectively compared with the saturation temperature corresponding to the low-pressure value, the fault of the low-pressure sensor of the air conditioner is determined through the comparison, and meanwhile, the fault type can be determined to be the abnormal high of the low-pressure sensor.
Optionally, the pre-detecting the fault of the air conditioner low pressure sensor according to the first difference and a first duration that the first difference is greater than a first threshold includes: and if the first difference is larger than a first threshold value and the first duration is larger than another time threshold value, determining that the pre-detection result is that the fault needs to be re-detected when the air conditioner operates.
In another aspect, the present invention provides a device for detecting a fault of a low pressure sensor of an air conditioner, including: the pressure sensor and the temperature sensor are used for acquiring a low-pressure value and a high-pressure value of the air conditioner and temperature information of a low-pressure end of the air conditioner; the data recording module is used for determining a first difference value between a low-pressure value and a high-pressure value of the air conditioner when the air conditioner is shut down, and determining a second difference value that the temperature information of a low-pressure end of the air conditioner is lower than a saturation temperature corresponding to the low-pressure value when the air conditioner is operated; a timer to determine a first duration for which the first difference is greater than a first threshold, and to determine a second duration for which the second difference is greater than a second threshold; the controller is used for pre-detecting the fault of the air conditioner low-pressure sensor according to the first difference and the first duration when the air conditioner is shut down; judging whether to detect the fault again when the air conditioner operates according to the pre-detection result; if so, when the air conditioner is operated, re-detecting the fault according to the second difference and the second duration.
Compared with the prior art, the device for detecting the fault of the air conditioner low-pressure sensor and the method for detecting the fault of the air conditioner low-pressure sensor have the same advantages, and are not repeated herein.
Optionally, the controller is further configured to control an operation mode of the air conditioner according to a detection result, if the detection result is that the low-voltage sensor is abnormally high, the controller is configured to record one-time fault without changing a current operation mode, and when the fault is recorded three times, the controller is configured to change the current operation mode to stop.
From this, can realize carrying out subsequent processing to the air conditioner low pressure sensor trouble that detects, confirm through the number of times of recording the trouble whether the maintenance of shutting down, confirm the maintenance of shutting down again after 3 troubles are recorded to avoid the erroneous judgement phenomenon that the single detection appears.
Optionally, the detection apparatus further comprises: and the display screen is used for displaying the fault of the air conditioner low-pressure sensor within preset time.
The fault of the low-pressure sensor of the air conditioner is informed in a display screen display mode, and the intelligent and simple air conditioner is more intelligent.
The invention also provides an air conditioner, which comprises the air conditioner low-pressure sensor fault detection device.
Compared with the prior art, the air conditioner and the detection device for the fault of the low-pressure sensor of the air conditioner have the same advantages, and the detailed description is omitted.
Drawings
FIG. 1 is a flow chart of a method for detecting faults of a low-pressure sensor of an air conditioner provided by the invention;
fig. 2 is a schematic structural diagram of a detection apparatus for detecting a fault of a low-pressure sensor of an air conditioner according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for detecting a fault of a low-pressure sensor of an air conditioner according to a second embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, the present invention provides a method for detecting a fault of a low pressure sensor of an air conditioner, the method comprising the following steps S101-S103:
step S101, when the air conditioner is shut down, a first difference value between a low-pressure value and a high-pressure value of the air conditioner is determined, and faults of the low-pressure sensor of the air conditioner are pre-detected according to the first difference value and a first duration time when the first difference value is larger than a first threshold value.
When the air conditioner is shut down, a real-time monitoring mode can be adopted, and a low-pressure sensor arranged on an air suction pipeline of the air conditioner compressor and a high-pressure sensor arranged on an exhaust pipeline of the air conditioner compressor respectively acquire a low-pressure value and a high-pressure value of the air conditioner.
During the shutdown period, the high pressure and the low pressure of the air conditioner gradually tend to be balanced due to the bypass effect of pipelines such as oil return and the like, namely the low pressure value and the high pressure value of the air conditioner are basically equal. If a large deviation between the low-pressure value and the high-pressure value of the air conditioner occurs in the pre-detection process, it is indicated that the high-pressure value or the low-pressure value is detected abnormally, and the pressure abnormality may be caused by the low-pressure sensor or the high-pressure sensor.
And S102, judging whether to detect the fault again when the air conditioner operates according to the pre-detection result.
The detection abnormality of the high-pressure value or the low-pressure value can be judged through the pre-detection, and if the first difference value is larger than a first threshold value and the first duration time is larger than another time threshold value, the failure is determined to be detected again when the air conditioner operates according to the pre-detection result.
And S103, if so, determining that the temperature information of the low-pressure end of the air conditioner is lower than a second difference value of the saturation temperature corresponding to the low-pressure value when the air conditioner operates, and re-detecting the fault according to the second difference value and a second duration time when the second difference value is greater than a second threshold value.
And under the air conditioner refrigeration mode, the temperature information of the low-pressure end of the air conditioner comprises the temperature of an inner machine coil and the air suction temperature of a compressor.
Further, the detecting the fault again according to a second difference and a second duration that the second difference is greater than a second threshold includes: if the difference value of the temperature of the coil pipe of the internal machine is lower than the saturation temperature is larger than a second threshold value, and the second duration time is larger than a time threshold value; meanwhile, the difference value that the suction temperature of the compressor is lower than the saturation temperature is larger than a second threshold value, and the second duration time is larger than a time threshold value; the fault of the air conditioner low-pressure sensor is determined to be that the low-pressure sensor is abnormally high.
When the refrigeration mode, interior machine coil pipe temperature and compressor temperature of breathing in all are in the low pressure end, under the general condition, interior machine coil pipe temperature is interior machine evaporating temperature promptly, and it is a little higher than the saturation temperature that suction pressure corresponds (suction pressure is less than evaporating pressure), and suction temperature can reserve predetermined suction superheat degree usually in order to prevent back liquid, and these 2 temperatures all can be higher than the saturation temperature that suction pressure corresponds when the air conditioner normally works, when appearing these 2 temperatures and being less than suction pressure and corresponding saturation temperature, explain back liquid or low pressure value high partially. And when the abnormal pressure value is judged in the pre-detection, the abnormal pressure value can be caused by the fault of the high-pressure sensor or the fault of the low-pressure sensor, and at the moment, the fault of the low-pressure sensor can be determined through the re-detection. Here, the saturation temperature corresponding to the suction pressure is the saturation temperature corresponding to the low pressure value.
In the air-conditioning heating mode, the temperature information of the low-pressure end of the air conditioner comprises the inlet temperature of the gas-liquid separator and the suction temperature of the compressor.
Further, the detecting the fault again according to the second difference and a second duration that the second difference is greater than a second threshold includes: if the inlet temperature of the gas-liquid separator is lower than the difference of the saturation temperature and is greater than a second threshold value, and the second duration is greater than a time threshold value; meanwhile, the difference value that the suction temperature of the compressor is lower than the saturation temperature is larger than a second threshold value, and the second duration time is larger than a time threshold value; the fault of the air conditioner low-pressure sensor is determined to be that the low-pressure sensor is abnormally high.
In the heating mode, the inlet temperature of the gas-liquid separator and the suction temperature of the compressor are both at the low-pressure end, and in general, the 2 temperatures are the temperatures after heating and evaporation and are higher than the evaporation temperature; namely, the 2 temperatures are higher than the saturation temperature corresponding to the suction pressure when the air conditioner works normally, and when the 2 temperatures are lower than the saturation temperature corresponding to the suction pressure, the liquid return or low-pressure value is higher. And when the abnormal pressure value is judged in the pre-detection, the abnormal pressure value can be caused by the fault of the high-pressure sensor or the fault of the low-pressure sensor, and at the moment, the fault of the low-pressure sensor can be determined through the re-detection. Here, the saturation temperature corresponding to the suction pressure is the saturation temperature corresponding to the low pressure value.
Therefore, according to the two different modes of the air conditioner during operation, the temperature information of the low-pressure end of the air conditioner is selected, the temperature information is effectively compared with the saturation temperature corresponding to the low-pressure value, the fault of the low-pressure sensor of the air conditioner is determined through the comparison, and meanwhile, the fault type can be determined to be the abnormal high of the low-pressure sensor.
It should be noted that the solution claimed in the present application may also be applied to a multi-split air conditioner.
Further, the detection method of the present invention, after the fault detection, further includes step S104: and if the fault of the low-pressure sensor of the air conditioner is detected, displaying the fault of the low-pressure sensor and recording the fault. Therefore, the sensor fault is more visually indicated, and the fault processing efficiency is improved.
The detection method of the present invention may further include, after the fault detection, step S105: and controlling the operation mode of the air conditioner according to the fault detection result and the fault record. Specifically, if the three detection results are recorded that the low-pressure sensor is abnormally high, the current operation mode is changed to stop. So as to avoid the misjudgment phenomenon in single detection.
The invention also provides a device for detecting the fault of the low-pressure sensor of the air conditioner, which comprises the following components: the pressure sensor and the temperature sensor are used for acquiring a low-pressure value and a high-pressure value of the air conditioner and temperature information of a low-pressure end of the air conditioner; the data recording module is used for determining a first difference value between a low-pressure value and a high-pressure value of the air conditioner when the air conditioner is shut down, and determining a second difference value that the temperature information of the low-pressure end of the air conditioner is lower than the saturation temperature corresponding to the low-pressure value when the air conditioner is operated; a timer for determining a first duration for which the first difference is greater than a first threshold, and for determining a second duration for which the second difference is greater than a second threshold; the controller is used for pre-detecting faults of the low-voltage sensor of the air conditioner according to the first difference and the first duration when the air conditioner is stopped; judging whether to detect the fault again when the air conditioner operates according to the pre-detection result; if so, when the air conditioner is operated, the fault is detected again according to the second difference value and the second duration time.
And preliminarily judging whether the pressure abnormity exists or not through pre-detection. And then whether the low-pressure sensor has faults is judged by re-detection. So as to avoid the related load of the system from being overlarge or damaged due to the failure of the low-pressure sensor of the air conditioner.
The controller is used for recording one-time fault and not changing the current operation mode when the detection result is that the low-voltage sensor is abnormally high, and is used for changing the current operation mode into shutdown when the three-time fault is recorded. So as to avoid the misjudgment phenomenon in single detection.
In addition, the detection device of the present invention further includes: and the display screen is used for displaying the fault of the air conditioner low-pressure sensor within the preset time. The fault of the low-pressure sensor of the air conditioner is informed in a display screen display mode, and the intelligent and simple air conditioner is more intelligent.
The invention also provides an air conditioner, which comprises the device for detecting the fault of the low-pressure sensor of the air conditioner.
The invention is further illustrated by the following 2 specific examples:
the first embodiment is as follows:
the present embodiment provides a device for detecting a fault of a low pressure sensor of an air conditioner, as shown in fig. 2, the device comprising: a main control device and a display panel.
The master control device comprises a pressure sensor, a temperature sensor, a data recording module, a timer and a controller;
and the pressure sensor and the temperature sensor are used for acquiring a low-pressure value and a high-pressure value of the air conditioner and temperature information of a low-pressure end of the air conditioner. And the data recording module is used for determining a first difference value between a low-pressure value and a high-pressure value of the air conditioner when the air conditioner is shut down, and determining a second difference value that the temperature information of the low-pressure end of the air conditioner is lower than the saturation temperature corresponding to the low-pressure value when the air conditioner is operated. A timer to determine a first duration for which the first difference is greater than a first threshold and to determine a second duration for which the second difference is greater than a second threshold.
The controller is used for pre-detecting the fault of the air conditioner low-pressure sensor according to the first difference and the first duration when the air conditioner is shut down; judging whether to detect the fault again when the air conditioner operates according to the pre-detection result; if so, when the air conditioner is operated, re-detecting the fault according to the second difference and the second duration, and processing a detection result.
The display panel comprises a communication module and a display screen; the communication module is used for communication between the main control device and the display panel; the display screen is used for displaying fault codes of the air conditioner temperature sensor for reminding.
Example two:
the embodiment provides a method for detecting a fault of a low-pressure sensor of an air conditioner, which comprises the following steps as shown in fig. 3:
s1, when the air conditioner is shut down, determining a first difference value between a low-pressure value and a high-pressure value of the air conditioner, and pre-detecting the fault of the air conditioner low-pressure sensor according to the first difference value and a first duration time when the first difference value is larger than a first threshold value.
And S2, judging whether to retest the fault when the air conditioner operates according to the pre-detection result. And if the first difference is larger than a first threshold value and the first duration is larger than a time threshold value, determining that the pre-detection result is that the fault needs to be re-detected when the air conditioner operates.
The first threshold value a is comprised between 1 and 40bar, preferably 1har, and the time threshold value relating to the first duration is comprised between 3 and 10 minutes, preferably 5 minutes.
And S3, starting the air conditioner, and judging whether the air conditioner is in a cooling mode or a heating mode.
S4, if the cooling mode is selected, if the difference between the temperature of the coil of the internal machine and the saturation temperature is greater than a second threshold, and the second duration is greater than a time threshold; meanwhile, the difference value that the suction temperature of the compressor is lower than the saturation temperature is larger than a second threshold value, and the second duration time is larger than a time threshold value; the fault of the air conditioner low-pressure sensor is determined to be that the low-pressure sensor is abnormally high.
In the cooling mode, the second threshold value B is comprised between 5 and 20 ℃, preferably 9 ℃, and the time threshold value associated with the second duration is comprised between 5 and 15 minutes, preferably 10 minutes.
S5, if the heating mode is adopted, if the inlet temperature of the gas-liquid separator is lower than the saturation temperature, the difference value is larger than a second threshold value, and the second duration time is larger than a time threshold value; meanwhile, the difference value that the suction temperature of the compressor is lower than the saturation temperature is larger than a second threshold value, and the second duration time is larger than a time threshold value; the fault of the air conditioner low-pressure sensor is determined to be that the low-pressure sensor is abnormally high.
In the heating mode, the second threshold value C is comprised between 3 and 50 ℃, preferably 7 ℃, and the time threshold value associated with the second duration is comprised between 5 and 15 minutes, preferably 10 minutes.
And S6, if the fault of the air conditioner low-pressure sensor is determined, displaying and recording the fault, and controlling the operation mode of the air conditioner according to the fault detection result and the record of the fault.
Specifically, if the three detection results are recorded that the low-pressure sensor is abnormally high, the current operation mode is changed to stop.
The present embodiment preliminarily determines whether there is a pressure abnormality by preliminary detection. And then whether the low-pressure sensor has faults is judged by re-detection. The fault detection of the air conditioner low-pressure sensor is realized, and after-sale maintenance personnel can be effectively helped to maintain and replace in time, so that the service life of an air conditioning system can be prolonged, and the satisfaction of users is improved.
EXAMPLE III
And stopping a certain multi-split air conditioning unit for 30min, and detecting that a first difference value between a low-pressure value and a high-pressure value is larger than 4bar after 5 min.
The first difference is greater than 4bar, which indicates that pressure anomaly occurs and further retesting is required.
And (4) subsequently starting the machine for heating operation, continuously detecting that Tci is 6 ℃, Ts is-20.7 ℃, Pst is 13.7 ℃, Tci-Pst is 7.7 ℃, Ts-Pst is 34.4 ℃, and Tci and Ts are too much lower than the saturation temperature corresponding to the low-pressure value for 10 min.
In conclusion, the detection value of the low-pressure sensor is judged to be abnormally high, and the unit displays a fault code.
Wherein Tci is the inlet temperature of the gas-liquid separator, Ts is the suction temperature of the compressor, and Pst is the saturation temperature corresponding to the low-pressure value.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method for detecting faults of a low-pressure sensor of an air conditioner is characterized by comprising the following steps:
when the air conditioner is shut down, determining a first difference value between a low-pressure value and a high-pressure value of the air conditioner, and pre-detecting the fault of the low-pressure sensor of the air conditioner according to the first difference value and a first duration time of which the first difference value is greater than a first threshold value;
judging whether to detect the fault again when the air conditioner operates according to the pre-detection result;
if so, when the air conditioner is operated, determining that the temperature information of the low-pressure end of the air conditioner is lower than a second difference value of the saturation temperature corresponding to the low-pressure value, and re-detecting the fault according to the second difference value and a second duration time when the second difference value is larger than a second threshold value.
2. The detection method according to claim 1, wherein in the air-conditioning cooling mode, the temperature information of the low-pressure end of the air conditioner comprises an internal machine coil temperature and a compressor suction temperature.
3. The method of claim 2, wherein said re-detecting the fault based on the second difference and a second duration that the second difference is greater than a second threshold comprises:
if the difference value of the temperature of the coil of the inner machine unit lower than the saturation temperature is larger than a second threshold value, and the second duration time is larger than a time threshold value;
meanwhile, the difference that the compressor suction temperature is lower than the saturation temperature is larger than a second threshold, and the second duration is larger than a time threshold;
determining that the fault of the air conditioner low-pressure sensor is that the low-pressure sensor is abnormally high.
4. The detection method according to claim 1, wherein in the air-conditioning heating mode, the temperature information of the low-pressure end of the air conditioner comprises the inlet temperature of the gas-liquid separator and the suction temperature of the compressor.
5. The method of claim 4, wherein said re-detecting the fault based on the second difference and a second duration that the second difference is greater than a second threshold comprises:
if the inlet temperature of the gas-liquid separator is lower than the saturation temperature by a difference value larger than a second threshold value, and the second duration is larger than a time threshold value;
meanwhile, the difference that the compressor suction temperature is lower than the saturation temperature is larger than a second threshold, and the second duration is larger than a time threshold; determining that the fault of the air conditioner low-pressure sensor is that the low-pressure sensor is abnormally high.
6. The detection method according to claim 1, wherein the pre-detecting the air conditioner low pressure sensor fault according to the first difference and a first duration that the first difference is greater than a first threshold value comprises:
and if the first difference is larger than a first threshold value and the first duration is larger than another time threshold value, determining that the pre-detection result is that the fault needs to be re-detected when the air conditioner operates.
7. A detection device for air conditioner low pressure sensor fault is characterized by comprising:
the pressure sensor and the temperature sensor are used for acquiring a low-pressure value and a high-pressure value of the air conditioner and temperature information of a low-pressure end of the air conditioner;
the data recording module is used for determining a first difference value between a low-pressure value and a high-pressure value of the air conditioner when the air conditioner is shut down, and determining a second difference value that the temperature information of a low-pressure end of the air conditioner is lower than a saturation temperature corresponding to the low-pressure value when the air conditioner is operated;
a timer to determine a first duration for which the first difference is greater than a first threshold, and to determine a second duration for which the second difference is greater than a second threshold;
the controller is used for pre-detecting the fault of the air conditioner low-pressure sensor according to the first difference and the first duration when the air conditioner is shut down; judging whether to detect the fault again when the air conditioner operates according to the pre-detection result; if so, when the air conditioner is operated, re-detecting the fault according to the second difference and the second duration.
8. The detecting device according to claim 7, wherein the controller is further configured to control an operation mode of the air conditioner according to the detection result,
and if the detection result is that the low-voltage sensor is abnormally high, the controller is used for recording the one-time fault and not changing the current operation mode, and after recording the three-time fault, the controller is used for changing the current operation mode into a shutdown mode.
9. The detection device according to claim 8, further comprising: and the display screen is used for displaying the fault of the air conditioner low-pressure sensor within preset time.
10. An air conditioner characterized by comprising the air conditioner low pressure sensor malfunction detection device according to any one of claims 7 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911315054.6A CN111023440B (en) | 2019-12-18 | 2019-12-18 | Air conditioner low-voltage sensor fault detection method and device and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911315054.6A CN111023440B (en) | 2019-12-18 | 2019-12-18 | Air conditioner low-voltage sensor fault detection method and device and air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111023440A true CN111023440A (en) | 2020-04-17 |
| CN111023440B CN111023440B (en) | 2021-08-13 |
Family
ID=70210524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911315054.6A Active CN111023440B (en) | 2019-12-18 | 2019-12-18 | Air conditioner low-voltage sensor fault detection method and device and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111023440B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113375287A (en) * | 2021-06-25 | 2021-09-10 | 宁波奥克斯电气股份有限公司 | Low-voltage sensor fault identification control method and device and multi-split air conditioning system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04356645A (en) * | 1991-06-03 | 1992-12-10 | Matsushita Electric Ind Co Ltd | Self trouble checking and displaying device in air conditioner |
| JP2005195249A (en) * | 2004-01-07 | 2005-07-21 | Mitsubishi Electric Corp | Air conditioning system |
| CN1987246A (en) * | 2005-12-22 | 2007-06-27 | 乐金电子(天津)电器有限公司 | Method for detecting poor pressure sensor of air conditioner |
| CN108286773A (en) * | 2018-01-15 | 2018-07-17 | 广东美的暖通设备有限公司 | Progress control method, device, air conditioner and computer readable storage medium |
| CN110107993A (en) * | 2019-05-05 | 2019-08-09 | 珠海格力电器股份有限公司 | Method and device for guaranteeing normal operation of unit after pressure abnormality |
| CN110500710A (en) * | 2019-07-30 | 2019-11-26 | 广东申菱环境系统股份有限公司 | A kind of air-conditioning fault self-diagnosis method |
-
2019
- 2019-12-18 CN CN201911315054.6A patent/CN111023440B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04356645A (en) * | 1991-06-03 | 1992-12-10 | Matsushita Electric Ind Co Ltd | Self trouble checking and displaying device in air conditioner |
| JP2005195249A (en) * | 2004-01-07 | 2005-07-21 | Mitsubishi Electric Corp | Air conditioning system |
| CN1987246A (en) * | 2005-12-22 | 2007-06-27 | 乐金电子(天津)电器有限公司 | Method for detecting poor pressure sensor of air conditioner |
| CN108286773A (en) * | 2018-01-15 | 2018-07-17 | 广东美的暖通设备有限公司 | Progress control method, device, air conditioner and computer readable storage medium |
| CN110107993A (en) * | 2019-05-05 | 2019-08-09 | 珠海格力电器股份有限公司 | Method and device for guaranteeing normal operation of unit after pressure abnormality |
| CN110500710A (en) * | 2019-07-30 | 2019-11-26 | 广东申菱环境系统股份有限公司 | A kind of air-conditioning fault self-diagnosis method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113375287A (en) * | 2021-06-25 | 2021-09-10 | 宁波奥克斯电气股份有限公司 | Low-voltage sensor fault identification control method and device and multi-split air conditioning system |
| CN113375287B (en) * | 2021-06-25 | 2022-04-19 | 宁波奥克斯电气股份有限公司 | Low-voltage sensor fault identification control method and device and multi-split air conditioning system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111023440B (en) | 2021-08-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113357746B (en) | Electronic expansion valve abnormity detection control method and device, air conditioner and storage medium | |
| CN106257161B (en) | Cooler compressor Anti-burnout control method and air conditioner | |
| CN109282424B (en) | Air conditioner control method and air conditioner control device | |
| CN108954670B (en) | Fault pre-judging method and control system of air conditioner and air conditioner | |
| CN109282423B (en) | Method for detecting communication connection error of heat recovery multi-split air conditioning system and heat recovery multi-split air conditioning system | |
| US11788753B2 (en) | HVAC system fault prognostics and diagnostics | |
| JP2008014609A (en) | Air-conditioning control device | |
| CA3113273A1 (en) | Detection of a reversing valve fault | |
| US11692726B2 (en) | System and method for distinguishing HVAC system faults | |
| US11639803B2 (en) | System and method for identifying causes of HVAC system faults | |
| CN109237721A (en) | Electric expansion valve fault detection method for air-conditioning | |
| CN114234383A (en) | Air conditioner control method and device | |
| CN107560101A (en) | A kind of fault detection method of air conditioner electronic expansion valve | |
| CN106594973A (en) | Method and device for detecting refrigerant of air conditioning system and air conditioner | |
| CN109028456A (en) | A kind of leakage detection method and device of refrigerant | |
| CN111023461A (en) | Detection control method and system of air conditioner, air conditioner and storage medium | |
| CN111023440B (en) | Air conditioner low-voltage sensor fault detection method and device and air conditioner | |
| CN110173816A (en) | A kind of detection method and detection device of air-conditioning refrigerant leakage | |
| CN105864953A (en) | Air conditioner throttling part blockage detection method and device and air conditioner | |
| CN114484716A (en) | Air conditioner, control method and device thereof and computer readable storage medium | |
| CA2885449C (en) | System for controlling operation of an hvac system having tandem compressors | |
| CN111121225A (en) | Fault detection method and device in high-voltage protection mode and air conditioner | |
| JP2005282903A (en) | Air conditioner | |
| CN113639399B (en) | Refrigerant missing fault determination method and device, air conditioner and computer storage medium | |
| CN115200194B (en) | Control method and device of outdoor unit of multi-split air conditioner, air conditioner and medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |