CN110987241A - Fault detection method and device for outer machine temperature sensing bulb and air conditioning unit - Google Patents
Fault detection method and device for outer machine temperature sensing bulb and air conditioning unit Download PDFInfo
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- CN110987241A CN110987241A CN201911340973.9A CN201911340973A CN110987241A CN 110987241 A CN110987241 A CN 110987241A CN 201911340973 A CN201911340973 A CN 201911340973A CN 110987241 A CN110987241 A CN 110987241A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/007—Testing
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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
- F24F11/89—Arrangement or mounting of control or safety devices
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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
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Abstract
The invention discloses a method and a device for detecting faults of an external machine temperature sensing bulb and an air conditioning unit, wherein the method comprises the following steps: detecting the change value of the detection temperature of the outer machine temperature sensing bulb, the change value of the inner machine pipe temperature and the change value of the environment temperature; and determining whether the outer machine temperature sensing bulb is inserted in place according to the change value of the detection temperature of the outer machine temperature sensing bulb, the change value of the inner machine pipe temperature and the change value of the environment temperature. The invention solves the problem that the reliability of the unit is influenced because whether the outer machine temperature sensing bulb is in fault cannot be determined in the prior art, avoids influencing the operation of the whole system when the outer machine temperature sensing bulb is in fault, and improves the performance and the reliability of the system.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an external unit temperature sensing bulb fault detection method and device and an air conditioning unit.
Background
It is well known that the more discrete components that are used, the poorer the reliability of any product, especially an electrical product. The frequency converter of the frequency conversion air conditioner has the characteristics of a series of influences on use reliability, such as multiple components, large frequency conversion power, wide frequency variation range and the like, is used outdoors, and is required to be subjected to severe summer heat and cold, and wind, wind and rain all the year round, so that the requirement on the reliability is higher, an exhaust temperature sensing bulb is usually arranged in an air conditioning system, and various parameters of the system are adjusted by utilizing the exhaust temperature detected by the exhaust temperature sensing bulb, so that the performance and the reliability of the air conditioning system are improved.
The location of the exhaust bulb is typically determined at the factory and is not later modified. However, in actual life, due to the combined action of various factors such as transportation vibration, use environment, use conditions, after-sales and the like, the position of the thermal bulb may not be the initially determined position, so that the detection result is not accurate enough, and the performance and reliability of system operation are affected.
Aiming at the problem that whether the outer machine temperature sensing bulb is in failure or not can not be determined in the related technology, so that the reliability of a machine set is influenced, an effective solution is not provided at present.
Disclosure of Invention
The invention provides a fault detection method and device for an external machine temperature sensing bulb and an air conditioning unit, and at least solves the problem that the reliability of the unit is affected because whether the external machine temperature sensing bulb is in fault cannot be determined in the prior art.
In order to solve the above technical problem, according to an aspect of an embodiment of the present invention, a method for detecting a fault of an external machine temperature sensing bulb is provided, including: detecting the change value of the detection temperature of the outer machine temperature sensing bulb, the change value of the inner machine pipe temperature and the change value of the environment temperature; and determining whether the outer machine temperature sensing bulb is inserted in place according to the change value of the detection temperature of the outer machine temperature sensing bulb, the change value of the inner machine pipe temperature and the change value of the environment temperature.
Further, determining whether the outer machine temperature sensing bulb is inserted in place according to the change value of the detection temperature of the outer machine temperature sensing bulb, the change value of the inner machine pipe temperature and the change value of the environment temperature, and the method comprises the following steps: determining whether the outer machine temperature sensing bulb falls off or not according to the change value of the outer machine temperature sensing bulb detection temperature and the change value of the inner machine pipe temperature; and if the outer machine temperature sensing bulb does not fall off, further determining whether the outer machine temperature sensing bulb is inserted in place according to the change value of the environment temperature.
Further, detect the change value of outer quick-witted thermal bulb detection temperature and the change value of interior machine pipe temperature, include: obtaining compressor starting front outer machine temperature sensingTemperature T of pack detectionThermal bulb 1And the inner machine tube temperature TInner pipe temperature 1(ii) a After the compressor is started for a first preset time, acquiring the temperature T detected by the outer machine temperature sensing bulbThermal bulb 2And the inner machine tube temperature TInner pipe temperature 2(ii) a Temperature T detected according to outer machine temperature sensing bulbThermal bulb 1And TThermal bulb 2Determining the change value delta of the detection temperature of the outer machine temperature sensing bulbTemperature sensing bagWherein, isTemperature sensing bag＝TThermal bulb 2-TThermal bulb 1(ii) a According to the temperature T of the inner machine pipeInner pipe temperature 1And TInner pipe temperature 2Determining the change value delta of the temperature of the inner machine pipeTemperature of inner pipeWherein, isTemperature of inner pipe＝TInner pipe temperature 2-TTemperature of inner pipe1。
Further, whether the outer machine temperature sensing bulb falls off is determined according to the change value of the outer machine temperature sensing bulb detection temperature and the change value of the inner machine pipe temperature, and the method comprises the following steps: when the change value of the temperature of the inner machine pipe is larger than a first preset value and the change value of the temperature detected by the outer machine temperature sensing bulb is smaller than a second preset value, determining that the outer machine temperature sensing bulb falls off; otherwise, determining that the outer machine temperature sensing bulb does not fall off.
Further, whether the outer machine temperature sensing bulb is inserted in place is further determined according to the change value of the environment temperature, and the method comprises the following steps: correcting the change value of the detection temperature of the outer machine temperature sensing bulb according to the change value of the environmental temperature; and determining whether the outer machine temperature sensing bulb is inserted in place according to the corrected change value of the detection temperature of the outer machine temperature sensing bulb and the change value of the saturation temperature of the compressor.
Further, determining whether the outer machine temperature sensing bulb is inserted in place according to the corrected change value of the detection temperature of the outer machine temperature sensing bulb and the change value of the saturation temperature of the compressor, and the method comprises the following steps: calculating a difference proportional coefficient between the corrected change value of the detection temperature of the outer machine temperature sensing bulb and the change value of the saturation temperature of the compressor according to a proportional control algorithm; and determining whether the outer machine temperature sensing bulb is inserted in place or not according to the difference proportionality coefficient.
Further, the difference proportionality coefficient is calculated by the following formula:
wherein, TThermal bulb 1Temperature, T, detected for outer machine bulb before compressor start-upThermal bulb 2The temperature detected by the outer machine temperature sensing bulb after the compressor is started for a second preset time; deltaOuter ringThe change value T of the external environment temperature before the compressor is started and after the compressor is started for a second preset timeOuter tube 1The saturation temperature corresponding to the exhaust pressure before the compressor is started; t isOuter tube 2And starting the compressor for a second preset time, and then carrying out saturation temperature corresponding to the exhaust pressure.
Further, whether the outer machine temperature sensing bulb is inserted in place or not is determined according to the difference proportionality coefficient, and the method comprises the following steps: judging whether the difference proportion coefficient belongs to a theoretical difference proportion range or not; if so, determining that the outer machine temperature sensing bulb is inserted in place, otherwise, determining that the outer machine temperature sensing bulb is not inserted in place.
Further, the outer machine temperature sensing bulb is an exhaust temperature sensing bulb.
According to another aspect of the embodiments of the present invention, there is provided an external machine bulb fault detection apparatus, including: the detection module is used for detecting the change value of the detection temperature of the outer machine temperature sensing bulb, the change value of the inner machine pipe temperature and the change value of the environment temperature; and the inserting determining module is used for determining whether the outer machine temperature sensing bulb is inserted in place according to the change value of the detection temperature of the outer machine temperature sensing bulb, the change value of the inner machine pipe temperature and the change value of the environment temperature.
According to another aspect of the embodiment of the invention, an air conditioning unit is provided, which comprises the external unit temperature sensing bulb fault detection device.
According to yet another aspect of embodiments of the present invention, there is provided a storage medium containing computer-executable instructions for performing the outdoor unit bulb fault detection method as described above when executed by a computer processor.
The invention provides an external machine temperature sensing bulb fault detection scheme, which is used for preliminarily determining whether an external machine temperature sensing bulb falls off or not by detecting the change value of the detection temperature of the external machine temperature sensing bulb and the change value of the internal machine pipe temperature. And if the outer machine temperature sensing bulb does not fall off, acquiring the change value of the environmental temperature, and further determining whether the outer machine temperature sensing bulb is inserted in place according to the change value of the environmental temperature. By the aid of the mode, whether the exhaust temperature sensing bulb falls off or is inserted in place or not can be judged in time, the influence on the operation of a whole machine system when the outer machine temperature sensing bulb fails is avoided, and the performance and the reliability of the system are improved.
Drawings
Fig. 1 is an alternative flowchart of an external unit bulb fault detection method according to an embodiment of the present invention;
fig. 2 is another alternative flow chart of an external machine bulb fault detection method according to an embodiment of the present invention;
fig. 3 is an alternative block diagram of an external unit thermal bulb fault detection apparatus according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Example 1
In a preferred embodiment 1 of the present invention, a method for detecting a fault of an external unit thermal bulb is provided, which can be directly applied to thermal bulbs of various air-conditioning external units, and in a specific implementation, can be implemented by writing a corresponding program in an air-conditioning unit controller. In particular, fig. 1 shows an alternative flow chart of the method, which, as shown in fig. 1, comprises the following steps S102-S104:
s102: detecting the change value of the detection temperature of the outer machine temperature sensing bulb, the change value of the inner machine pipe temperature and the change value of the environment temperature;
s104: and determining whether the outer machine temperature sensing bulb is inserted in place according to the change value of the detection temperature of the outer machine temperature sensing bulb, the change value of the inner machine pipe temperature and the change value of the environment temperature.
In the above embodiment, a fault detection scheme for an external machine temperature sensing bulb is provided, where whether the external machine temperature sensing bulb falls off is preliminarily determined by detecting a change value of a detection temperature of the external machine temperature sensing bulb and a change value of a temperature of an internal machine pipe. And if the outer machine temperature sensing bulb does not fall off, acquiring the change value of the environmental temperature, and further determining whether the outer machine temperature sensing bulb is inserted in place according to the change value of the environmental temperature. By the aid of the mode, whether the exhaust temperature sensing bulb falls off or is inserted in place or not can be judged in time, the influence on the operation of a whole machine system when the outer machine temperature sensing bulb fails is avoided, and the performance and the reliability of the system are improved.
In a preferred embodiment of the present invention, determining whether the outer machine temperature sensing bulb is inserted in place according to a variation value of the outer machine temperature sensing bulb detection temperature, a variation value of the inner machine pipe temperature, and a variation value of the ambient temperature includes: determining whether the outer machine temperature sensing bulb falls off or not according to the change value of the outer machine temperature sensing bulb detection temperature and the change value of the inner machine pipe temperature; and if the outer machine temperature sensing bulb does not fall off, further determining whether the outer machine temperature sensing bulb is inserted in place according to the change value of the environment temperature.
In a preferred embodiment of the present invention, the detecting the change value of the detection temperature of the outer machine thermal bulb and the change value of the inner machine pipe temperature includes: obtaining the temperature T detected by the outer machine temperature sensing bulb before the compressor is startedThermal bulb 1And the inner machine tube temperature TInner pipe temperature 1(ii) a After the compressor is started for a first preset time, acquiring the temperature T detected by the outer machine temperature sensing bulbThermal bulb 2And the inner machine tube temperature TInner pipe temperature 2(ii) a Temperature T detected according to outer machine temperature sensing bulbThermal bulb 1And TThermal bulb 2Determining the change value delta of the detection temperature of the outer machine temperature sensing bulbTemperature sensing bagWherein, isTemperature sensing bag＝TThermal bulb 2-TThermal bulb 1(ii) a According to the temperature T of the inner machine pipeInner pipe temperature 1And TInner pipe temperature 2Determining the change value delta of the temperature of the inner machine pipeTemperature of inner pipeWherein, isTemperature of inner pipe＝TInner pipe temperature 2-TInner pipe temperature 1。
After the compressor is started, the compressor is kept to operate at a certain frequency, the temperature of the whole compressor is changed, the change value of the temperature of the inner compressor pipe and the change value of the temperature of the outer compressor temperature sensing bulb are detected, and when the temperature sensing bulb is an exhaust temperature sensing bulb, the change value of the temperature of the outer compressor temperature sensing bulb is the change value of the exhaust temperature. And determining whether the outer machine temperature sensing bulb falls off or not according to the change value of the detection temperature of the outer machine temperature sensing bulb and the change value of the inner machine pipe temperature. The method specifically comprises the following steps: when the change value of the temperature of the inner machine pipe is larger than a first preset value and the change value of the temperature detected by the outer machine temperature sensing bulb is smaller than a second preset value, determining that the outer machine temperature sensing bulb falls off; otherwise, determining that the outer machine temperature sensing bulb does not fall off. Before detecting the change value of the temperature detected by the outer machine temperature sensing bulb, detecting the temperature of the inner machine tube, determining whether the system is in a cooling state, a heating state or an air supply state according to the change value of the temperature of the inner machine tube, wherein the temperature of the inner machine tube is almost unchanged in the air supply state, and the change of the temperature of the exhaust pipe cannot indicate the state of the temperature sensing bulb, so that only when the change value of the temperature of the inner machine tube is larger than a first preset value, namely the system is in the cooling state or the heating state, whether the outer machine temperature sensing bulb falls off is further determined according to the change value of the temperature detected by the outer machine temperature sensing bulb.
In the embodiment, whether the outer machine temperature sensing bulb falls off or not can be determined, if the outer machine temperature sensing bulb falling-off judging condition is not met, the accurate judgment mode of the position of the temperature sensing bulb is entered, the ambient temperature compensation is added, the influence of the ambient temperature change on the temperature change detected by the temperature sensing bulb is reduced, and whether the exhaust temperature sensing bulb is accurately arranged or not is accurately judged.
Specifically, correcting the change value of the detection temperature of the outer machine temperature sensing bulb according to the change value of the environment temperature; and determining whether the outer machine temperature sensing bulb is inserted in place according to the corrected change value of the detection temperature of the outer machine temperature sensing bulb and the change value of the saturation temperature of the compressor. Determining whether the outer machine temperature sensing bulb is inserted in place according to the corrected change value of the detection temperature of the outer machine temperature sensing bulb and the change value of the saturation temperature of the compressor, wherein the method comprises the following steps: calculating a difference proportional coefficient between the corrected change value of the detection temperature of the outer machine temperature sensing bulb and the change value of the saturation temperature of the compressor according to a proportional control algorithm; and determining whether the outer machine temperature sensing bulb is inserted in place or not according to the difference proportionality coefficient.
Wherein, the difference proportional coefficient is calculated by the following formula:
wherein, TTemperature sensingBag 1Temperature, T, detected for outer machine bulb before compressor start-upThermal bulb 2The temperature detected by the outer machine temperature sensing bulb after the compressor is started for a second preset time; deltaOuter ringThe change value T of the external environment temperature before the compressor is started and after the compressor is started for a second preset timeOuter tube 1The saturation temperature corresponding to the exhaust pressure before the compressor is started; t isOuter tube 2And starting the compressor for a second preset time, and then carrying out saturation temperature corresponding to the exhaust pressure. Further, whether the outer machine temperature sensing bulb is inserted in place or not is determined according to the difference proportionality coefficient, and the method comprises the following steps: judging whether the difference proportion coefficient belongs to a theoretical difference proportion range or not; if so, determining that the outer machine temperature sensing bulb is inserted in place, otherwise, determining that the outer machine temperature sensing bulb is not inserted in place.
And a proportional control algorithm is added, the position of the temperature sensing bulb is judged in time through the relative proportion, whether the temperature sensing bulb is inserted in place or not is accurately judged, the influence on the optimal performance of the whole machine, the influence on the reliable operation of the whole machine and the damage to the whole machine system are avoided.
Wherein, the outer machine temperature sensing bulb is an exhaust temperature sensing bulb.
Through the embodiment, whether the temperature sensing bulb falls off or not can be judged in time, and whether the temperature sensing bulb is inserted in place or not can be judged. After the temperature sensing bulb is determined to be accurate in position, the temperature detected by the temperature sensing bulb is more accurate, the opening degree of the electronic expansion valve is controlled by the temperature detected by the temperature sensing bulb, the opening degree of the electronic expansion valve is more accurate, and the corresponding parameters of the system are adjusted by the difference value between the exhaust temperature and the target exhaust temperature, so that the capability and the energy efficiency of the system are optimized. Meanwhile, the accurate temperature detected by the temperature sensing bulb can be used for more timely protecting the unit under severe working conditions.
In a preferred embodiment 1 of the present invention, there is provided another method for detecting a fault of an external machine thermal bulb, which is applied to an exhaust thermal bulb, and specifically, fig. 2 shows an alternative flowchart of the method, as shown in fig. 2, where the method includes the following steps:
and judging whether the exhaust temperature sensing bulb falls off or not after the unit is started for 5 min.
First, examineMeasuring the temperature change value T of the tube temperature of the internal combustion engine after 5minInner pipe temperature 2-TInner pipe temperature 1Is greater than a predetermined value T1, TInner pipe temperature 1After starting up, when the compressor is not started, the temperature T of the internal pipe of the evaporator is detectedInner pipe temperature 2And detecting the temperature of the inner pipe of the evaporator after the whole machine is started and operates for 5 min.
Simultaneously judging the exhaust temperature change value T after 5min of startingExhaust gas 2-TExhaust gas 1Whether it is less than a preset value T2, where the initial exhaust temperature TExhaust gas 1For detecting the exhaust temperature value T when the compressor is not started after startingExhaust gas 2Detecting the temperature of an exhaust temperature sensing bulb after the whole machine is started and operates for 5 min; if the two conditions are met simultaneously, the thermal bulb is judged to fall off.
If the condition is not met, entering an exhaust temperature sensing bulb position accurate judgment mode, and detecting the change delta of the environmental temperatureOuter ring(5min later ring temperature T2Initial ring temperature T1) The temperature is used for ambient temperature compensation and is used for eliminating the influence of ambient temperature change (considering unit output heat) on the temperature change of the exhaust temperature sensing bulb. Then, PI (proportional control) algorithm is used for detection, k value is calculated,
Touter tube 1Saturation temperature, T, corresponding to discharge pressure before compressor start-upOuter tube 2And the saturation temperature corresponding to the exhaust pressure after the compressor is started for 5 min.
And judging whether the exhaust temperature sensing bulb is inserted in place or not by calculating the comparison between the K value and the theoretical K value, wherein the preferable value range of the theoretical K value is 0.9-1.1.
And if the k value belongs to the theoretical value range, determining that the thermal bulb is inserted in place, otherwise, not inserting the thermal bulb in place.
The method can also be used for judging whether the temperature sensing bulb falls off or not because of too large vibration of the compressor during operation. And similarly, carrying out primary judgment by detecting the temperature change of the pipe and the exhaust temperature change, then carrying out K value calculation by applying environmental temperature compensation and a PI algorithm, comparing the K value with a preset value K, and then judging whether the position of the thermal bulb is inserted in place.
Example 2
Based on the method for detecting failure of the external machine bulb in embodiment 1, in a preferred embodiment 2 of the present invention, there is further provided an apparatus for detecting failure of an external machine bulb, specifically, fig. 3 shows an optional structural block diagram of the apparatus, and as shown in fig. 3, the apparatus includes:
the detection module 302 is used for detecting a change value of the detection temperature of the outer machine temperature sensing bulb, a change value of the inner machine pipe temperature and a change value of the environment temperature;
and the insertion determining module 304 is connected with the detecting module 302 and is used for determining whether the outer machine temperature sensing bulb is inserted in place according to the change value of the detection temperature of the outer machine temperature sensing bulb, the change value of the inner machine pipe temperature and the change value of the environment temperature.
The insertion determination module 304 includes: the falling determination submodule is used for determining whether the outer machine temperature sensing bulb falls off or not according to the change value of the detection temperature of the outer machine temperature sensing bulb and the change value of the temperature of the inner machine pipe; and the insertion determining submodule is used for further determining whether the external machine temperature sensing bulb is inserted in place according to the change value of the environment temperature if the external machine temperature sensing bulb does not fall off.
In the above embodiment, a fault detection scheme for an external machine temperature sensing bulb is provided, where whether the external machine temperature sensing bulb falls off is preliminarily determined by detecting a change value of a detection temperature of the external machine temperature sensing bulb and a change value of a temperature of an internal machine pipe. And if the outer machine temperature sensing bulb does not fall off, acquiring the change value of the environmental temperature, and further determining whether the outer machine temperature sensing bulb is inserted in place according to the change value of the environmental temperature. By the aid of the mode, whether the exhaust temperature sensing bulb falls off or is inserted in place or not can be judged in time, the influence on the operation of a whole machine system when the outer machine temperature sensing bulb fails is avoided, and the performance and the reliability of the system are improved.
Further, the detection module 302 includes: a first acquisition unit for acquiring the temperature T detected by the outer machine temperature sensing bulb before the start of the compressorThermal bulb 1And the inner machine tube temperature TInner pipe temperature 1(ii) a A second obtaining unit for obtaining the temperature T detected by the outer machine temperature sensing bulb after the compressor is started for a first preset timeTemperature sensing bag2And the inner machine tube temperature TInner pipe temperature 2(ii) a A determination unit for determining the temperature T detected by the outer machine bulbThermal bulb 1And TThermal bulb 2Determining the change value delta of the detection temperature of the outer machine temperature sensing bulbTemperature sensing bagWherein, isTemperature sensing bag＝TThermal bulb 2-TThermal bulb 1(ii) a According to the temperature T of the inner machine pipeInner pipe temperature 1And TInner pipe temperature 2Determining the change value delta of the temperature of the inner machine pipeTemperature of inner pipeWherein, isTemperature of inner pipe＝TInner pipe temperature 2-TInner pipe temperature 1。
Preferably, the dropout determination submodule comprises: the first falling-off determining unit is used for determining that the outer machine temperature sensing bulb falls off when the change value of the inner machine pipe temperature is larger than a first preset value and the change value of the outer machine temperature sensing bulb detection temperature is smaller than a second preset value; and the second falling determining unit is used for determining that the outer machine temperature sensing bulb does not fall off when the change value of the inner machine pipe temperature is not larger than the first preset value and/or the change value of the outer machine temperature sensing bulb detection temperature is not smaller than the second preset value.
Further, the insertion determination module 304 includes: the correcting unit is used for correcting the change value of the detection temperature of the outer machine temperature sensing bulb according to the change value of the environment temperature; and the inserting determining unit is used for determining whether the outer machine temperature sensing bulb is inserted in place according to the corrected change value of the detection temperature of the outer machine temperature sensing bulb and the change value of the saturation temperature of the compressor.
In the above embodiment, the insertion determination unit includes: the calculation subunit is used for calculating a difference proportional coefficient between the corrected change value of the detection temperature of the outer machine temperature sensing bulb and the change value of the saturation temperature of the compressor according to a proportional control algorithm; and the determining subunit is used for determining whether the external machine temperature sensing bulb is inserted in place or not according to the difference proportionality coefficient.
Wherein, the difference proportional coefficient is calculated by the following formula:
wherein, TThermal bulb 1Temperature, T, detected for outer machine bulb before compressor start-upThermal bulb 2Temperature sensing of the outer unit after a second preset time for starting the compressorThe temperature of the pack detection; deltaOuter ringThe change value T of the external environment temperature before the compressor is started and after the compressor is started for a second preset timeOuter tube 1The saturation temperature corresponding to the exhaust pressure before the compressor is started; t isOuter tube 2And starting the compressor for a second preset time, and then carrying out saturation temperature corresponding to the exhaust pressure.
Optionally, the determining the subunit comprises: judging whether the difference proportion coefficient belongs to a theoretical difference proportion range or not; if so, determining that the outer machine temperature sensing bulb is inserted in place, otherwise, determining that the outer machine temperature sensing bulb is not inserted in place.
In the invention, the outer machine temperature sensing bulb is an exhaust temperature sensing bulb.
With regard to the apparatus in the above embodiments, the specific manner in which each unit and each module performs operations has been described in detail in the embodiments related to the method, and will not be described in detail herein.
Example 3
Based on the external machine bulb fault detection device provided in the above embodiment 2, in a preferred embodiment 3 of the present invention, an air conditioning unit is further provided, which includes the external machine bulb fault detection device as described above.
In the above embodiment, a fault detection scheme for an external machine temperature sensing bulb is provided, where whether the external machine temperature sensing bulb falls off is preliminarily determined by detecting a change value of a detection temperature of the external machine temperature sensing bulb and a change value of a temperature of an internal machine pipe. And if the outer machine temperature sensing bulb does not fall off, acquiring the change value of the environmental temperature, and further determining whether the outer machine temperature sensing bulb is inserted in place according to the change value of the environmental temperature. By the aid of the mode, whether the exhaust temperature sensing bulb falls off or is inserted in place or not can be judged in time, the influence on the operation of a whole machine system when the outer machine temperature sensing bulb fails is avoided, and the performance and the reliability of the system are improved.
Example 4
Based on the external machine bulb fault detection method provided in the above embodiment 1, in a preferred embodiment 4 of the present invention, there is further provided a storage medium containing computer executable instructions, which when executed by a computer processor, are configured to perform the external machine bulb fault detection method as described above.
In the above embodiment, a fault detection scheme for an external machine temperature sensing bulb is provided, where whether the external machine temperature sensing bulb falls off is preliminarily determined by detecting a change value of a detection temperature of the external machine temperature sensing bulb and a change value of a temperature of an internal machine pipe. And if the outer machine temperature sensing bulb does not fall off, acquiring the change value of the environmental temperature, and further determining whether the outer machine temperature sensing bulb is inserted in place according to the change value of the environmental temperature. By the aid of the mode, whether the exhaust temperature sensing bulb falls off or is inserted in place or not can be judged in time, the influence on the operation of a whole machine system when the outer machine temperature sensing bulb fails is avoided, and the performance and the reliability of the system are improved.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (12)
1. A method for detecting faults of an external machine temperature sensing bulb is characterized by comprising the following steps:
detecting the change value of the detection temperature of the outer machine temperature sensing bulb, the change value of the inner machine pipe temperature and the change value of the environment temperature;
and determining whether the outer machine temperature sensing bulb is inserted in place according to the change value of the detection temperature of the outer machine temperature sensing bulb, the change value of the inner machine pipe temperature and the change value of the environment temperature.
2. The method of claim 1, wherein determining whether the outer machine bulb is inserted in place according to the variation value of the detection temperature of the outer machine bulb, the variation value of the inner machine pipe temperature and the variation value of the environmental temperature comprises:
determining whether the outer machine temperature sensing bulb falls off or not according to the change value of the detection temperature of the outer machine temperature sensing bulb and the change value of the temperature of the inner machine pipe;
and if the external machine temperature sensing bulb does not fall off, further determining whether the external machine temperature sensing bulb is inserted in place according to the change value of the environment temperature.
3. The method of claim 1, wherein detecting the change value of the detection temperature of the outer machine thermal bulb and the change value of the inner machine pipe temperature comprises:
obtaining the temperature T detected by the outer machine temperature sensing bulb before the compressor is startedThermal bulb 1And the inner machine tube temperature TInner pipe temperature 1；
After the compressor is started for a first preset time, acquiring the temperature T detected by the outer machine temperature sensing bulbThermal bulb 2And the inner machine tube temperature TInner pipe temperature 2；
According to the temperature T detected by the outer machine temperature sensing bulbThermal bulb 1And TThermal bulb 2Determining the change value delta of the detection temperature of the outer machine temperature sensing bulbTemperature sensing bagWherein, isTemperature sensing bag＝TThermal bulb 2-TThermal bulb 1；
According to the temperature T of the inner machine pipeInner pipe temperature 1And TInner pipe temperature 2Determining the change value delta of the temperature of the inner machine pipeTemperature of inner pipeWherein, isTemperature of inner pipe＝TInner pipe temperature 2-TInner pipe temperature 1。
4. The method of claim 2, wherein determining whether the outer machine bulb is detached according to the variation value of the outer machine bulb detection temperature and the variation value of the inner machine tube temperature comprises:
when the change value of the temperature of the inner machine pipe is larger than a first preset value and the change value of the temperature detected by the outer machine temperature sensing bulb is smaller than a second preset value, determining that the outer machine temperature sensing bulb falls off;
otherwise, determining that the outer machine temperature sensing bulb does not fall off.
5. The method of claim 2, wherein the further determining whether the outer machine bulb is inserted in place according to the change value of the environmental temperature comprises:
correcting the change value of the detection temperature of the outer machine temperature sensing bulb according to the change value of the environment temperature;
and determining whether the outer machine temperature sensing bulb is inserted in place according to the corrected change value of the detection temperature of the outer machine temperature sensing bulb and the change value of the saturation temperature of the compressor.
6. The method of claim 5, wherein determining whether the outer machine bulb is inserted in place according to the corrected variation value of the detection temperature of the outer machine bulb and the variation value of the saturation temperature of the compressor comprises:
calculating a difference proportional coefficient between the corrected change value of the detection temperature of the outer machine temperature sensing bulb and the change value of the saturation temperature of the compressor according to a proportional control algorithm;
and determining whether the outer machine temperature sensing bulb is inserted in place or not according to the difference proportionality coefficient.
7. The method of claim 6, wherein the difference scaling factor is calculated by the formula:
8. The method of claim 6, wherein determining whether the outer machine bulb is inserted in place according to the difference scaling factor comprises:
judging whether the difference proportion coefficient belongs to a theoretical difference proportion range or not;
if so, determining that the external machine temperature sensing bulb is inserted in place, otherwise, determining that the external machine temperature sensing bulb is not inserted in place.
9. The method of claim 7, wherein the outer machine bulb is an exhaust bulb.
10. The utility model provides an outer quick-witted thermal bulb fault detection device which characterized in that includes:
the detection module is used for detecting the change value of the detection temperature of the outer machine temperature sensing bulb, the change value of the inner machine pipe temperature and the change value of the environment temperature;
and the inserting determining module is used for determining whether the outer machine temperature sensing bulb is inserted in place according to the change value of the detection temperature of the outer machine temperature sensing bulb, the change value of the inner machine pipe temperature and the change value of the environment temperature.
11. An air conditioning assembly, characterized by comprising the outer unit bulb fault detection device of claim 10.
12. A storage medium containing computer-executable instructions for performing the outer machine bulb fault detection method of any one of claims 1 to 9 when executed by a computer processor.
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