CN110440393B - Air conditioner temperature sensor fault detection method and device and air conditioner - Google Patents
Air conditioner temperature sensor fault detection method and device and air conditioner Download PDFInfo
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- CN110440393B CN110440393B CN201910741907.6A CN201910741907A CN110440393B CN 110440393 B CN110440393 B CN 110440393B CN 201910741907 A CN201910741907 A CN 201910741907A CN 110440393 B CN110440393 B CN 110440393B
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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
- F24F11/52—Indication arrangements, e.g. displays
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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
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
Abstract
The invention provides a method and a device for detecting faults of an air conditioner temperature sensor and an air conditioner, wherein the method for detecting the faults of the air conditioner temperature sensor comprises the following steps: determining an electric signal value corresponding to the temperature information acquired by the air conditioner temperature sensor; determining a duration of time that the electrical signal value is greater than an electrical signal value upper limit or less than an electrical signal value lower limit; and detecting the fault of the air conditioner temperature sensor according to the electric signal value and the duration. The air conditioner temperature sensor fault detection method, the air conditioner temperature sensor fault detection device and the air conditioner are high in accuracy, can detect and display specific fault types, and well meet the use requirements of users.
Description
Technical Field
The invention relates to the technical field of air conditioning equipment, in particular to a method and a device for detecting faults of an air conditioner temperature sensor and an air conditioner.
Background
With the continuous development of science and technology, more and more household appliances enter the daily life and work of people. The household appliance takes an air conditioner as an example, and the air conditioner can provide a cooling or heating effect through heat exchange in a cold or hot environment so as to provide a comfortable indoor environment.
The air conditioner temperature sensor plays a crucial role in normal operation of the air conditioner, and if the air conditioner temperature sensor fails, related loads of a system may be damaged, and the air conditioner cannot be normally started, so that fault detection of the air conditioner temperature sensor is particularly important. The accuracy of the fault detection of the existing air conditioner temperature sensor is not enough, the specific fault type cannot be detected, and the use requirement of a user cannot be well met.
In addition, the existing scheme generally uses a single fault code to display the fault of the air conditioner temperature sensor, the specific fault or abnormal type of the air conditioner temperature sensor cannot be quickly, clearly and accurately known, and an optimized space exists.
Disclosure of Invention
The invention aims to solve the problems that the fault detection scheme of the existing air conditioner temperature sensor is not accurate enough, cannot detect and display specific fault types and cannot well meet the use requirements of users.
In order to solve the problems, the invention provides a method and a device for detecting faults of an air conditioner temperature sensor and an air conditioner.
A method for detecting faults of an air conditioner temperature sensor comprises the following steps:
determining an electric signal value corresponding to the temperature information acquired by the air conditioner temperature sensor;
determining a duration of time that the electrical signal value is greater than an electrical signal value upper limit or less than an electrical signal value lower limit; and
and detecting the fault of the air conditioner temperature sensor according to the electric signal value and the duration.
According to the detection method, the fault of the air conditioner temperature sensor is detected according to the electric signal value and the duration time, the condition of error protection caused by the fact that the output signal of the normal sensor exceeds the set range can be effectively eliminated, and the accuracy of fault detection of the air conditioner temperature sensor is improved.
Further, determining an electric signal value corresponding to the temperature information collected by the air conditioner temperature sensor includes:
collecting temperature information by using the air conditioner temperature sensor;
and acquiring the temperature information, and converting the temperature information into an electric signal value through digital-to-analog conversion.
Further, detecting the fault of the air conditioner temperature sensor according to the electric signal value and the duration time comprises the following steps:
and if the electric signal value is greater than an electric signal value upper limit, and the duration of the electric signal value greater than the electric signal value upper limit is greater than a time threshold, determining that the fault of the air conditioner temperature sensor is a short-circuit fault.
Further, detecting the fault of the air conditioner temperature sensor according to the electric signal value and the duration, further comprising:
and if the electric signal value is smaller than a lower limit of the electric signal value and the duration of the electric signal value smaller than the lower limit of the electric signal value is larger than a time threshold, determining that the fault of the air conditioner temperature sensor is an open circuit fault.
Therefore, the invention can simultaneously carry out short-circuit fault detection and open-circuit fault detection, can accurately determine whether the fault type of the air-conditioning temperature sensor is a short-circuit fault or an open-circuit fault, is convenient for maintenance personnel to quickly locate the fault and timely maintain and replace the fault, thereby prolonging the service life of the air-conditioning system and improving the satisfaction degree of users.
Further, the electric signal is a voltage signal or a current signal.
An apparatus for detecting a malfunction of an air conditioner temperature sensor, comprising:
the digital-to-analog signal conversion module is used for determining an electric signal value corresponding to the temperature information acquired by the air conditioner temperature sensor;
a timer for determining a duration of time that the electrical signal value is greater than an upper electrical signal value limit or less than a lower electrical signal value limit; and
and the main controller is used for detecting the faults of the air conditioner temperature sensor according to the electric signal value and the duration time.
According to the detection device, the air conditioner temperature sensor fault is detected according to the electric signal value and the duration time, the error protection condition caused by the fact that the output signal of the normal sensor exceeds the set range can be effectively eliminated, and the accuracy of the air conditioner temperature sensor fault detection is improved.
Further, the main controller is also used for controlling the operation mode of the air conditioner according to the detection result.
Further, when the detection result is that the air conditioner temperature sensor is in fault: if the current mode is a refrigeration or dehumidification mode, the main controller is used for changing the current mode into a ventilation mode; and if the current mode is the heating mode, the main controller is used for changing the current mode into a ventilation mode and stopping the machine after the ventilation mode is switched into the ventilation mode and runs for a preset time. Therefore, the related load of the system is prevented from being damaged due to the failure of the air conditioner temperature sensor.
Further, the detection device further comprises: and the display screen is used for displaying different fault types of the air conditioner temperature sensor by adopting different fault codes. The fault type can be more visually indicated by adopting different fault codes to display different fault types, the fault type can be conveniently and quickly determined, and the fault processing efficiency is improved.
An air conditioner comprises the air conditioner temperature sensor fault detection device.
Drawings
FIG. 1 is a flow chart of a method for detecting faults of an air conditioner temperature sensor according to the present invention;
FIG. 2 is a block diagram of an apparatus for detecting a fault of an air conditioner temperature sensor according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a method for detecting a fault of an air conditioner temperature sensor according to an 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.
The invention provides a method for detecting faults of an air conditioner temperature sensor, which comprises the following steps of:
determining an electric signal value corresponding to the temperature information acquired by the air conditioner temperature sensor;
determining a duration of time that the electrical signal value is greater than an electrical signal value upper limit or less than an electrical signal value lower limit; and
and detecting the fault of the air conditioner temperature sensor according to the electric signal value and the duration.
According to the detection method, the fault of the air conditioner temperature sensor is detected according to the electric signal value and the duration time, the condition of error protection caused by the fact that the output signal of the normal sensor exceeds the set range can be effectively eliminated, and the accuracy of fault detection of the air conditioner temperature sensor is improved.
Wherein, confirm the corresponding electric signal value of temperature information that air conditioner temperature sensor gathered, include:
collecting temperature information by using the air conditioner temperature sensor;
and acquiring the temperature information, and converting the temperature information into an electric signal value through digital-to-analog conversion.
The detecting the fault of the air conditioner temperature sensor according to the electric signal value and the duration time comprises the following steps:
if the electric signal value is larger than an electric signal value upper limit, and the duration of the electric signal value larger than the electric signal value upper limit is larger than a time threshold, determining that the fault of the air conditioner temperature sensor is a short-circuit fault;
and if the electric signal value is smaller than a lower limit of the electric signal value and the duration of the electric signal value smaller than the lower limit of the electric signal value is greater than a time threshold, determining that the fault of the air conditioner temperature sensor is an open circuit fault (also called an open circuit fault).
Therefore, the invention can simultaneously carry out short-circuit fault detection and open-circuit fault detection, can accurately determine whether the fault type of the air-conditioning temperature sensor is a short-circuit fault or an open-circuit fault, is convenient for maintenance personnel to quickly locate the fault and timely maintain and replace the fault, thereby prolonging the service life of the air-conditioning system and improving the satisfaction degree of users.
The electrical signal is a voltage signal or a current signal, and the electrical signal value is a voltage signal value or a current signal value, that is, a measured value of the voltage signal (referred to as a voltage value for short) or a measured value of the current signal (referred to as a current value for short). The upper limit of the electric signal value is the maximum value of the range of the electric signal value in normal work, the lower limit of the electric signal value is the minimum value of the range of the electric signal value in normal work, and the upper limit of the electric signal value and the lower limit of the electric signal value can be preset.
Further, after the fault detection, the method of the present invention further includes: and if the fault of the air conditioner temperature sensor is detected, displaying the fault type of the air conditioner temperature sensor. Specifically, different fault codes are used to display different fault types. Therefore, the fault type is more visually indicated, the fault type is conveniently and quickly determined, and the fault processing efficiency is improved.
In addition, the method of the present invention, after the fault detection, may further include: and controlling the operation mode of the air conditioner according to the fault detection result. Specifically, if the detection result is that the air conditioner temperature sensor has a fault, the operation mode of the air conditioner is changed; and if the detection result is that the air conditioner temperature sensor is normal, the operation mode of the air conditioner is not changed. Therefore, the related load of the system is prevented from being damaged due to the failure of the air conditioner temperature sensor.
The invention also provides a device for detecting the fault of the air conditioner temperature sensor, which comprises:
the digital-to-analog signal conversion module is used for determining an electric signal value corresponding to the temperature information acquired by the air conditioner temperature sensor;
a timer for determining a duration of time that the electrical signal value is greater than an upper electrical signal value limit or less than a lower electrical signal value limit; and
and the main controller is used for detecting the faults of the air conditioner temperature sensor according to the electric signal value and the duration time.
According to the detection device, the air conditioner temperature sensor fault is detected according to the electric signal value and the duration time, the error protection condition caused by the fact that the output signal of the normal sensor exceeds the set range can be effectively eliminated, and the accuracy of the air conditioner temperature sensor fault detection is improved.
Specifically, if the electric signal value is greater than an electric signal value upper limit, and the duration of the electric signal value greater than the electric signal value upper limit is greater than a time threshold, the main controller determines that the air conditioner temperature sensor fault is a short-circuit fault; and if the electric signal value is smaller than an electric signal value lower limit, and the duration time that the electric signal value is smaller than the electric signal value lower limit is larger than a time threshold, the main controller determines that the air conditioner temperature sensor fault is an open circuit fault.
Further, the main controller is further configured to control an operation mode of the air conditioner according to a detection result, and when the detection result indicates that the air conditioner temperature sensor has a fault: if the current mode is a refrigeration or dehumidification mode, the main controller is used for changing the current mode into a ventilation mode; and if the current mode is the heating mode, the main controller is used for changing the current mode into a ventilation mode and stopping the machine after the ventilation mode is switched into the ventilation mode and runs for a preset time. Therefore, the related load of the system is prevented from being damaged due to the failure of the air conditioner temperature sensor.
Preferably, the apparatus for detecting a fault of the air conditioner temperature sensor may further include: and the display screen is used for displaying the fault type of the air conditioner temperature sensor. Specifically, the display screen displays different fault types by adopting different fault codes. Therefore, the fault type is more visually indicated, the fault type is conveniently and quickly determined, and the fault processing efficiency is improved.
The following describes the method and device for detecting faults of the air conditioner temperature sensor in detail by combining embodiments.
Example one
The present embodiment provides a device for detecting a fault of an air conditioner temperature sensor, as shown in fig. 2, the device for detecting a fault of an air conditioner temperature sensor includes: a main control panel and a display panel.
The main control board comprises a temperature sensor, a digital-to-analog conversion module, a timer and a main controller (fault processing unit); the temperature sensor is used for acquiring temperature information; the digital-to-analog conversion module is used for converting the temperature information into a voltage signal; the timer is used for determining the duration of the voltage value which is larger than a maximum limit voltage value or smaller than a minimum limit voltage value; and the main controller is used for detecting and processing the faults of the air conditioner temperature sensor according to the voltage signal and the duration time.
The display panel comprises a display main control communication module and a display screen; the display main control communication module is used for communication between the main control panel and the display panel; the display screen is used for displaying the fault type of the air conditioner temperature sensor for reminding; specifically, when short-circuit fault occurs, the display screen displays a fault code E1; when open circuit fault occurs, the display screen displays fault code 1E. The fault code may be adjusted as needed, but is not limited thereto.
Example two
The embodiment provides a method for detecting a fault of an air conditioner temperature sensor, as shown in fig. 3, the method for detecting a fault of an air conditioner temperature sensor includes the following steps:
s1: the temperature sensor collects temperature information;
s2: the digital-to-analog signal conversion module converts the temperature information into a voltage signal;
s3: judging whether the voltage value U of the voltage signal exceeds a normal working voltage range (setting the upper limit of the normal working voltage range, namely the maximum limit voltage value, as Umax, and the lower limit of the normal working voltage range, namely the minimum limit voltage value Umin), if not, judging that the temperature sensor is normal, returning to continuous detection, and if so, entering the next step;
s4: judging whether the voltage value U exceeds a maximum limit voltage value Umax, if not, entering the next step (step S5); if the voltage value U exceeds the maximum limit voltage value Umax, judging whether the duration time t1 (the duration time that the voltage value U exceeds the maximum limit voltage value Umax) is greater than a time threshold ts, if the duration time t1 is greater than the time threshold ts, judging that the fault is a sensor short circuit, displaying a fault code E1, and entering step S6; if the duration t1 is less than the time threshold ts, clearing the value t1, and returning to continue detection;
specifically, the voltage value Umax is between 4.73 volts and 4.95 volts, the time threshold ts is between 1.5 and 2.5 seconds, and ts is usually set to 2 seconds.
S5: judging whether the obtained voltage value U is lower than the minimum limit voltage value Umin or not, and if the voltage value U is not lower than the minimum limit voltage value Umin, returning to continue detection; if the voltage value U is lower than the minimum limit voltage value Umin, determining whether the duration time t2 (the duration time that the voltage value U is lower than the minimum limit voltage value Umin) is greater than a time threshold ts, if the duration time t2 is greater than the time threshold ts, determining that the fault is a sensor open circuit, displaying a fault code 1E, and entering step S6; if t2 is smaller than the time threshold ts, clearing the t2 value and returning to continue detection;
specifically, the voltage value Umin is between 0.05 volt and 0.137 volt, the time threshold ts is between 1.5 and 2.5 seconds, and ts is set to be 2 seconds generally.
S6: after the fault is judged, the operation mode of the air conditioner is correspondingly changed according to the current mode, the air conditioner continues to operate, and the fault is recovered after maintenance personnel carry out maintenance and replacement.
Specifically, as shown in table 1, if the current mode is the cooling or dehumidifying mode, the current mode is changed to the ventilating mode; if the current mode is the heating mode, changing the current mode into a ventilation mode and running for 5min, and stopping the machine; and if the current operation mode is other modes except the cooling mode, the dehumidification mode and the heating mode, exiting the current function.
TABLE 1
The embodiment judges whether the fault of the temperature sensor is an open circuit or a short circuit through the size of the voltage signal measured value of the collected temperature sensor and the duration time of the voltage signal measured value, improves the accuracy of fault detection of the air conditioner temperature sensor, can more effectively help maintenance personnel after sale to locate the fault, and timely maintains and replaces the fault, thereby prolonging the service life of the air conditioning system and improving the satisfaction degree of users.
In addition, the invention also provides an air conditioner which comprises the air conditioner temperature sensor fault detection device.
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 (8)
1. A method for detecting faults of an air conditioner temperature sensor is characterized by comprising the following steps:
determining an electric signal value corresponding to the temperature information acquired by the air conditioner temperature sensor;
determining a duration of time that the electrical signal value is greater than an electrical signal value upper limit or less than an electrical signal value lower limit; and
detecting the fault of the air conditioner temperature sensor according to the electric signal value and the duration;
after the fault detection, controlling the operation mode of the air conditioner according to the fault detection result;
the controlling of the operation mode of the air conditioner according to the fault detection result includes:
if the fault detection result is that the air conditioner temperature sensor has a fault, controlling the operation mode of the air conditioner according to the current mode of the air conditioner, and if the fault detection result is that the air conditioner temperature sensor is normal, not changing the operation mode of the air conditioner;
the operation mode of controlling the air conditioner according to the current mode of the air conditioner comprises the following steps:
if the current mode of the air conditioner is a refrigeration or dehumidification mode, changing the current mode of the air conditioner into a ventilation mode;
if the current mode of the air conditioner is a heating mode, changing the current mode of the air conditioner into a ventilation mode to run for a preset time and then stopping the air conditioner;
and if the current mode of the air conditioner is other than the cooling mode, the dehumidification mode and the heating mode, exiting the current function.
2. The detection method according to claim 1, wherein determining the electric signal value corresponding to the temperature information collected by the air conditioner temperature sensor comprises:
collecting temperature information by using the air conditioner temperature sensor;
and acquiring the temperature information, and converting the temperature information into an electric signal value through digital-to-analog conversion.
3. The method of claim 1, wherein detecting the air conditioner temperature sensor fault based on the electrical signal value and duration comprises:
and if the electric signal value is greater than an electric signal value upper limit, and the duration of the electric signal value greater than the electric signal value upper limit is greater than a time threshold, determining that the fault of the air conditioner temperature sensor is a short-circuit fault.
4. The method of claim 3, wherein detecting the air conditioner temperature sensor fault based on the electrical signal value and duration, further comprises:
and if the electric signal value is smaller than a lower limit of the electric signal value and the duration of the electric signal value smaller than the lower limit of the electric signal value is larger than a time threshold, determining that the fault of the air conditioner temperature sensor is an open circuit fault.
5. The detection method according to claim 1, wherein the electrical signal is a voltage signal or a current signal.
6. A detection device for air conditioner temperature sensor fault is characterized by comprising:
the digital-to-analog signal conversion module is used for determining an electric signal value corresponding to the temperature information acquired by the air conditioner temperature sensor;
a timer for determining a duration of time that the electrical signal value is greater than an upper electrical signal value limit or less than a lower electrical signal value limit; and
the main controller is used for detecting the fault of the air conditioner temperature sensor according to the electric signal value and the duration;
the main controller is also used for controlling the operation mode of the air conditioner according to the detection result;
the controlling of the operation mode of the air conditioner according to the fault detection result includes:
if the fault detection result is that the air conditioner temperature sensor has a fault, controlling the operation mode of the air conditioner according to the current mode of the air conditioner, and if the fault detection result is that the air conditioner temperature sensor is normal, not changing the operation mode of the air conditioner;
the operation mode of controlling the air conditioner according to the current mode of the air conditioner comprises the following steps:
if the current mode of the air conditioner is a refrigeration or dehumidification mode, changing the current mode of the air conditioner into a ventilation mode;
if the current mode of the air conditioner is a heating mode, changing the current mode of the air conditioner into a ventilation mode to run for a preset time and then stopping the air conditioner;
and if the current mode of the air conditioner is other than the cooling mode, the dehumidification mode and the heating mode, exiting the current function.
7. The detection device of claim 6, further comprising: and the display screen is used for displaying different fault types of the air conditioner temperature sensor by adopting different fault codes.
8. An air conditioner characterized by comprising the air conditioner temperature sensor malfunction detection device according to any one of claims 6 to 7.
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| CN112963938B (en) * | 2021-03-18 | 2022-07-12 | 宁波奥克斯电气股份有限公司 | Control method and device of air conditioner and air conditioner |
| CN112963940B (en) * | 2021-03-18 | 2022-04-19 | 宁波奥克斯电气股份有限公司 | Control method and device and air conditioner |
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| CN102759176B (en) * | 2012-07-18 | 2014-12-10 | 广东志高空调有限公司 | Intelligent self-checking method for air conditioner |
| CN102818658B (en) * | 2012-08-23 | 2016-03-30 | 联合汽车电子有限公司 | Motor stator temperature sensor fault diagnostic system |
| US9983070B2 (en) * | 2015-01-22 | 2018-05-29 | Trane International Inc. | Temperature sensor validation |
| CN106197758B (en) * | 2016-06-29 | 2019-06-28 | 广东美的厨房电器制造有限公司 | The fault detection method and device of temperature sensing circuit |
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| CN107166638B (en) * | 2017-05-09 | 2020-04-17 | 广东美的暖通设备有限公司 | Fault detection method and device of temperature sensor and multi-connected air conditioning system |
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