CN112066517B - Fault detection method for transmission mechanism of temperature detection device and air conditioner - Google Patents
Fault detection method for transmission mechanism of temperature detection device and air conditioner 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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0043—Indoor units, e.g. fan coil units characterised by mounting arrangements
- F24F1/0047—Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in the ceiling or at the ceiling
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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Abstract
The invention discloses a fault detection method for a transmission mechanism of a temperature detection device and an air conditioner. The fault detection method of the transmission mechanism of the temperature detection device comprises the following steps: when the transmission mechanism moves, calculating the difference value of the temperature detected by a temperature sensor which is arranged on the transmission mechanism and used for detecting the environment temperature field at the current position and the previous position in each detection period; and judging whether the difference value of the detected temperatures is smaller than a preset threshold value, and if so, judging that the transmission mechanism has a fault. The invention utilizes the original hardware of the air conditioner to analyze the related data, thereby judging whether the transmission mechanism has a fault or not, not increasing the cost of extra hardware, accurately judging the fault and providing guarantee for the stability of equipment such as the air conditioner and the like.
Description
Technical Field
The invention relates to an air conditioner, in particular to a fault detection method of a transmission mechanism for mounting a temperature sensor in the air conditioner.
Background
At present, the air conditioner mainly has several methods such as an infrared sensor, a temperature sensor, a camera and the like for detecting the human body. The infrared sensor judges whether a moving object passes through the infrared sensor by transmitting and receiving signals of the head. However, the detection angle of the sensor is limited, and particularly when the infrared sensor is applied to a raise boring machine, the infrared sensor is required to be capable of detecting 360 degrees.
The common mode in the prior art is to install a plurality of sensors, and has lower requirements on structural difficulty but higher cost. Also prior art has increased transmission structure, makes single sensor rotate to it can detect bigger detection field of vision to realize single sensor. In order to ensure the precision of the rotation angle, a stepping motor is often used to drive a transmission structure. However, any reliable transmission structure has the possibility of damage, especially the wire is twisted repeatedly for a long time along with the rotation of the rotating structure, and the twisting-off condition may occur, and the stepping motor has no feedback signal and cannot determine whether the stepping motor is actually rotating.
When the transmission structure breaks down, normal wind sweeping action of the air conditioner can be influenced, if the sensor needs to detect A, B, C, D, E surfaces, the transmission structure breaks down, and the sensor should rotate to the B surface according to logic setting, but actually is still on the A surface or between A and B surfaces. And if the person exists on the face A or the persons exist on the faces A to B, the person is mistaken to be the person on the face B. Leading to abnormal sweeping of the B surface. Greatly influencing the user experience.
Therefore, how to quickly detect the fault of the transmission mechanism for installing the temperature sensor is an urgent technical problem to be solved.
Disclosure of Invention
The invention provides a fault detection method of a transmission mechanism of a temperature detection device and an air conditioner, and aims to solve the technical problem that faults of the transmission mechanism of the temperature sensor for detecting human bodies or detecting an environment temperature field are difficult to judge in the prior art.
The invention relates to a fault detection method of a transmission mechanism of a temperature detection device, which comprises the following steps:
when the transmission mechanism moves, calculating the difference value of the temperature detected by a temperature detection device which is arranged on the transmission mechanism and used for detecting the environment temperature field at the current position and the previous position in each detection period;
and judging whether the difference value of the detected temperatures is smaller than a preset threshold value, and if so, judging that the transmission mechanism has a fault.
Further, the temperature detection device is an array type temperature sensor.
Furthermore, the difference value of the temperature detected by the array type temperature sensor at the current position and the previous position is calculated according to a formula
Is calculated to obtainDelta is the difference value of the detected temperature, m is the total number of pixel points of the array type temperature sensor, Tm is backTemperature, T, detected for the current positionm frontThe temperature detected for the previous position.
Further, the transmission mechanism is a rotating mechanism.
Further, the fault detection method of the present invention further comprises the steps of: when the rotating mechanism breaks down, acquiring temperature data of each pixel point detected by the array type temperature sensor according to the rotating direction of the rotating mechanism; calculating the deviation between the actual rotation angle and the target rotation angle of the rotating mechanism according to the temperature data in the direction vertical to the moving direction of each pixel point; and controlling the rotating mechanism to perform angle compensation according to the deviation.
Further, the deviation between the actual rotation angle of the rotating mechanism and the target rotation angle is specifically calculated by the following steps:
defining a direction perpendicular to the moving direction of each pixel point as a row or a column;
calculating the average temperature variation of the temperature detected by each pixel point in each row or each column in the direction vertical to the moving direction of each pixel point at the current position and the previous position;
if the average temperature variation of n continuous rows or n continuous columns of pixel points is smaller than the preset threshold value, and the n rows or n continuous columns of pixel points are located at the edge of the single detection area of the array type temperature sensor, judging that the rotating mechanism has n rows or n continuous columns of angles without rotating;
and calculating the deviation between the actual rotation angle of the rotating mechanism and the target rotation angle according to the angles of the n rows or n columns without rotation.
Further, defining the moving direction of each pixel point as a line, and when the direction perpendicular to the moving direction of each pixel point is a column, passing formula of average temperature variation of the temperature detected by each pixel point in each column at the current position and the previous position
Calculating to obtain delta y which is the average temperature variation of the temperature detected by the pixel point of the y-th row at the current position and the previous position, and Tx afterThe temperature, T, detected at the current position for the pixel point of the y column and the x rowBefore xThe temperature of the pixel points in the y-th row and the x-th row at the previous position is detected, and N is the total row number of the temperature data obtained by single detection of the array type temperature sensor.
Further, the calculating of the deviation between the actual rotation angle and the target rotation angle of the rotating mechanism according to the angles of n rows or n columns without rotation is specifically obtained by the following steps:
firstly, calculating the percentage of n rows or n columns which do not rotate to the total row number or the total column number in the temperature data obtained by the array type temperature sensor through single detection;
multiplying the percentage by a target rotation angle to obtain a rotation lacking angle;
and dividing the angle of the default rotation by the resistance coefficient of the rotating mechanism to obtain the deviation between the actual rotating angle and the target rotating angle of the rotating mechanism.
Further, when the n rows or the n columns which do not rotate are the total row number or the total column number in the temperature data obtained by the array type temperature sensor through single detection, a user is reminded.
And further, controlling the rotating mechanism to perform angle compensation according to the deviation, specifically controlling the rotating mechanism to perform multiple times of adjustment to complete angle compensation.
The air conditioner provided by the invention comprises a controller, a temperature detection device and a transmission mechanism for driving the temperature detection device to detect an environment temperature field, wherein the controller detects the fault of the transmission mechanism by adopting the fault detection method according to the technical scheme according to the temperature data of the temperature detection device.
Further, the air conditioner comprises a courtyard machine.
Further, the transmission mechanism includes a stepping motor.
The invention analyzes the temperature data of the temperature detection device of the air conditioner for detecting the environment temperature field (such as detecting human body), thereby accurately judging the fault state of the transmission mechanism for driving the temperature detection device without increasing extra cost. When this type of temperature-sensing ware is specifically for the courtyard machine wisdom eye, can detect whether the transmission structure of courtyard machine wisdom eye breaks down, avoid the courtyard machine wisdom eye function control error, influence user experience, guarantee user's comfort.
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The invention is described in detail below with reference to examples and figures, in which:
FIG. 1 is a control framework diagram according to an embodiment of the present invention.
FIG. 2 shows temperature measurement data according to an embodiment of the present invention.
FIG. 3 is a flow chart of an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Thus, a feature indicated in this specification will serve to explain one of the features of one embodiment of the invention, and does not imply that every embodiment of the invention must have the stated feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
The principles of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.
As shown in fig. 1, the transmission mechanism of the temperature detection device of the present invention is used to drive the temperature sensor for detecting the ambient temperature field in the air conditioner or other electrical appliances to move, so that a single temperature sensor can detect the ambient temperature field in a complete indoor area (for example, the single temperature sensor is specifically applied to human body detection), and the controller of the electrical appliance in which the temperature detection device is located detects and judges the fault of the transmission mechanism by using the detection data of the temperature sensor itself.
The movement of the transmission mechanism may be translation or rotation, that is, the transmission mechanism includes a rotation mechanism or a translation mechanism, the present invention does not limit the specific operation mode of the transmission mechanism, and in order to further describe the fault detection method of the present invention in detail, the following describes the technical solution of the present invention with a specific embodiment in which the transmission mechanism is a rotation mechanism.
When the transmission mechanism normally rotates, a certain temperature difference exists between a current area and a last detected area detected by a temperature sensor arranged on the transmission mechanism at intervals, so that when the transmission mechanism is subjected to fault detection, the difference value of the temperature detected by the temperature sensor arranged on the transmission mechanism at the current position and the last position is calculated in each detection period, whether the detected temperature difference value is smaller than a preset threshold value or not is judged, if the detected temperature difference value is smaller than the preset threshold value, the situation that the transmission mechanism does not rotate in place exists is indicated, and therefore the fault of the transmission mechanism is judged.
In order to further accurately detect the human body, the temperature sensor used in this embodiment is an array type temperature sensor, such as a matrix type infrared thermopile temperature sensor, the invention is not limited to the specific type and kind of the array type temperature sensor, and all the array type temperature sensors for human body detection can be used to assist in detecting the fault of the rotating mechanism carrying them.
When the array temperature sensor is driven by the rotating structure, the temperature data of the area temperature distribution as shown in fig. 2 can be obtained by detecting the current area. Each numerical value represents the temperature data detected by each pixel point of the array type temperature sensor, and the higher the numerical value is, the higher the temperature is. It should be noted that, although the array temperature sensor is rotating, so that one temperature sensor can shoot temperature field data in the whole room area, the temperature data shot by the array temperature sensor at different rotating positions are temperature data in different areas, and the areas form a plane in the room, so that one pixel point of the array temperature sensor is two points with a certain distance in the plane in the temperature data measured for many times, and the pixel point of the array temperature sensor has a corresponding moving direction.
In the actual work of the rotating mechanism, the time of the stepping motor rotating is below 10s, and the actual environment hardly changes, because a detection period can be a time interval of more than 10s, the current position of the previous detection period is changed into the previous position after reaching the current detection period, and the time setting of the specific detection period can be adjusted by a person skilled in the art according to the movement speed of the rotating mechanism. As shown in fig. 3, when the rotating mechanism rotates a certain angle (e.g. a target rotating angle), since the arrangement and material of each region are different in a room space, the infrared rays radiated by the infrared thermopile temperature sensors are also different, and therefore, after the controller of the air conditioner controls the rotating mechanism (specifically, the stepping motor in the rotating mechanism is controlled), the temperature data difference before and after the rotation is analyzed, and whether the rotating mechanism is faulty or not is determined.
In particular, by the formula
To calculate the difference delta between the temperature detected by the array temperature sensor at the current position and the previous position, when the difference delta is larger than the current value<If a threshold value T is preset, the rotating mechanism is abnormal, and a fault needs to be prompted to remind a user of repair. Where δ is the difference between the detected temperatures, m is the total number of pixels of the array temperature sensor, Tm is backTemperature, T, detected for the current positionm frontThe temperature detected for the previous position.
The invention can not only detect the fault of the rotating mechanism, but also can further acquire the temperature data of each pixel point detected by the array type temperature sensor according to the rotating direction of the rotating mechanism when the rotating mechanism has the fault, calculate the deviation between the actual rotating angle and the target rotating angle of the rotating mechanism according to the temperature data in the direction vertical to the moving direction of each pixel point, and control the rotating mechanism to carry out angle compensation according to the calculated deviation, thereby realizing the self-repairing of the fault.
In order to calculate the deviation between the actual rotation angle of the rotating mechanism and the target rotation angle, a direction perpendicular to the moving direction of each pixel point may be defined as a row or a column, and for example, a direction perpendicular to the moving direction of each pixel point (horizontal direction) may be positioned as a column by defining the moving direction of the pixel point as a row. Since the temperature data of each pixel point obtained by a single detection of the array sensor is shown in the following table, if the moving direction of the pixel point is the row direction, after the rotating mechanism rotates to a certain angle, each column (e.g., T11 to T19) of the current position and each column of the previous position will have a certain temperature difference.
| T11 | T21 | T31 | T41 | T51 | T61 | T71 | T81 | T91 |
| T12 | T22 | T32 | T42 | T52 | T62 | T72 | T82 | T92 |
| T13 | T23 | T33 | T43 | T53 | T63 | T73 | T83 | T93 |
| T14 | T24 | T34 | T44 | T54 | T64 | T74 | T84 | T94 |
| T15 | T25 | T35 | T45 | T55 | T65 | T75 | T85 | T95 |
| T16 | T26 | T36 | T46 | T56 | T66 | T76 | T86 | T96 |
| T17 | T27 | T37 | T47 | T57 | T67 | T77 | T87 | T97 |
| T18 | T28 | T38 | T48 | T58 | T68 | T78 | T88 | T98 |
| T19 | T29 | T39 | T49 | T59 | T69 | T79 | T89 | T99 |
For accurate description, the following defines the moving direction of the pixel as a row, and then the average temperature variation of the temperature detected at the current position and the previous position of each pixel in each column in the temperature data detected by the array temperature sensor needs to be calculated, specifically by a formula
Calculating delta y is the average temperature variation of the temperature detected by the pixel point of the y-th row at the current position and the previous position, Tx afterThe temperature, T, detected at the current position for the pixel point of the y column and the x rowBefore xThe temperature of the pixel points in the y-th row and the x-th row at the previous position is detected, and N is the total row number of the temperature data obtained by single detection of the array type temperature sensor. If the average temperature variation of n continuous rows of pixel points is smaller than a preset threshold value, and the n rows of pixel points are located at the edge of the single detection area of the array type temperature sensor (namely, T11 is used as a first row or T91 is used as a last row), which indicates that the rotation angle of the rotating mechanism is too small, it is determined that the rotating mechanism has n rows of angles and does not rotate, and then the deviation between the actual rotation angle and the target rotation angle of the rotating mechanism is obtained through calculation according to the n rows or n rows of angles which do not rotate.
Specifically, the deviation between the actual rotation angle of the rotating mechanism and the target rotation angle is calculated according to the angles of n rows or n columns without rotation, and is calculated through the following steps:
firstly, n rows without rotation account for the general row in the temperature data obtained by single detection of the array type temperature sensorThe percentage of the number or total number of columns, and then multiplying the percentage by the target rotation angle to obtain the angle of the missing rotation, i.e. by formula
Calculating to obtain the angle of the default rotation, wherein
The angle of the rotation is the angle of the rotation lack,
the target rotation angle is N, the number of rows without rotation is N, and the total number of rows detected by the array type temperature sensor in one time is N. The angle at this moment can be further corrected, when the resistance is large due to unreasonable installation, dust accumulation and the like, the torque of the stepping motor of the rotating mechanism is insufficient, so that the actual rotating angle needs to be corrected through a resistance coefficient, the deviation between the actual rotating angle and the target rotating angle of the rotating mechanism can be obtained by dividing the angle which is not rotated by the resistance coefficient of the rotating mechanism, and the value of the specific resistance coefficient can be obtained by technicians in the field according to experience or experimental data.
In addition, because the complexity of the practical application environment, such as the installation height of the air conditioner, the horizontal practical visual angle and the like, is influenced by the factors, the angles detected by the sensors of the units installed in different environments are different, so that the fault is obtained by analyzing and judging the data detected by the temperature sensor loaded on the transmission mechanism, the compensation angle is calculated and only represents an error trend, and when the error trend is detected by the controller of the air conditioner, prompt information can be sent to a user, such as a display panel, a lamp panel, a buzzer and the like, so as to prompt the user. And after the user confirms the fault phenomenon according to the prompt, the controller of the air conditioner controls the transmission mechanism to adjust for multiple times according to the calculated angle required to be compensated to complete angle compensation, for example, the angle is gradually compensated for ten times, and after each compensation, the user confirms again to finally complete the angle compensation. The 10 times exemplified here can also take other values in other specific application cases.
When the n columns without rotation are the total column number in the temperature data obtained by the array type temperature sensor through single detection, the rotating mechanism is proved to be not rotated completely and blocked, and the controller is meaningless in control compensation at the moment and reminds a user so that the maintenance can be carried out as soon as possible.
The above specific technical solution of the present invention can be preferably applied to a raise machine, but is not limited to this type, and can also be applied to other air conditioners, and all of them belong to the protection scope of the present invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (12)
1. A method for detecting a failure of a transmission mechanism of a temperature detection device, comprising the steps of:
when the transmission mechanism moves, calculating the difference value of the temperature detected by a temperature detection device which is arranged on the transmission mechanism and used for detecting the environment temperature field at the current position and the previous position in each detection period;
judging whether the difference value of the detected temperatures is smaller than a preset threshold value or not, and if so, judging that the transmission mechanism is in fault;
the temperature detection device is an array type temperature sensor.
2. The method of claim 1, wherein the difference between the detected temperature of the array type temperature sensor at the current position and the detected temperature at the previous position is calculated according to a formula
Calculating to obtain delta, wherein delta is the difference value of the detected temperature, m is the total number of pixel points of the array type temperature sensor, and Tm is backTemperature, T, detected for the current positionm frontIs the previous positionThe detected temperature.
3. The method for detecting a malfunction of a transmission mechanism of a temperature detection device according to claim 1, wherein the transmission mechanism is a rotary mechanism.
4. The method for detecting a malfunction of a transmission mechanism of a temperature detection apparatus according to claim 3, further comprising the steps of:
when the rotating mechanism breaks down, acquiring temperature data of each pixel point detected by the array type temperature sensor according to the rotating direction of the rotating mechanism;
calculating the deviation between the actual rotation angle and the target rotation angle of the rotating mechanism according to the temperature data in the direction vertical to the moving direction of each pixel point;
and controlling the rotating mechanism to perform angle compensation according to the deviation.
5. The method for detecting a failure of a transmission mechanism of a temperature detection device according to claim 4, wherein the deviation between the actual rotation angle of the rotating mechanism and the target rotation angle is calculated by:
defining a direction perpendicular to the moving direction of each pixel point as a row or a column;
calculating the average temperature variation of the temperature detected by each pixel point in each row or each column in the direction vertical to the moving direction of each pixel point at the current position and the previous position;
if the average temperature variation of n continuous rows or n continuous columns of pixel points is smaller than the preset threshold value, and the n rows or n continuous columns of pixel points are located at the edge of the single detection area of the array type temperature sensor, judging that the rotating mechanism has n rows or n continuous columns of angles without rotating;
and calculating the deviation between the actual rotation angle of the rotating mechanism and the target rotation angle according to the angles of the n rows or n columns without rotation.
6. The method for detecting a failure in a driving mechanism of a temperature detection device according to claim 5, wherein a moving direction of each pixel is defined as a row, and a direction perpendicular to the moving direction of each pixel is defined as a column, and a passing formula of an average temperature change amount of the temperature detected at the current position and the previous position of each pixel in each column is defined as a passage formula of an average temperature change amount of the temperature detected at the current position and the previous position
Calculating to obtain delta y which is the average temperature variation of the temperature detected by the pixel point of the y-th row at the current position and the previous position, and Tx afterThe temperature, T, detected at the current position for the pixel point of the y column and the x rowBefore xThe temperature of the pixel points in the y-th row and the x-th row at the previous position is detected, and N is the total row number of the temperature data obtained by single detection of the array type temperature sensor.
7. The method for detecting a failure of a transmission mechanism of a temperature detection device according to claim 5, wherein the deviation between the actual rotation angle of the rotating mechanism and the target rotation angle calculated from the angles of n rows or n columns without rotation is calculated by:
firstly, calculating the percentage of n rows or n columns which do not rotate to the total row number or the total column number in the temperature data obtained by the array type temperature sensor through single detection;
multiplying the percentage by a target rotation angle to obtain a rotation lacking angle;
and dividing the angle of the default rotation by the resistance coefficient of the rotating mechanism to obtain the deviation between the actual rotating angle and the target rotating angle of the rotating mechanism.
8. The method as claimed in claim 7, wherein the user is alerted when n rows or n columns of non-rotation indicate the total number of rows or the total number of columns in the temperature data detected by the array temperature sensor at a time.
9. The method for detecting a failure in a transmission mechanism of a temperature detection device according to claim 4, wherein controlling the rotation mechanism to perform angle compensation according to the deviation is specifically controlling the rotation mechanism to perform multiple adjustments to perform angle compensation.
10. The method for detecting a malfunction of a transmission mechanism of a temperature detection device according to claim 1, wherein the temperature detection device has no overlapping portion of the region detected at the current position and the region detected at the previous position.
11. An air conditioner, comprising a controller, a temperature detection device and a transmission mechanism for driving the temperature detection device to detect the ambient temperature field, characterized in that the controller detects the failure of the transmission mechanism according to the temperature data of the temperature detection device by using the failure detection method as claimed in any one of claims 1 to 10.
12. The air conditioner of claim 11, wherein the air conditioner comprises a courtyard unit.
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