CN116679199A - Failure detection method and system for contactor of air conditioner heater - Google Patents
Failure detection method and system for contactor of air conditioner heater Download PDFInfo
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- CN116679199A CN116679199A CN202310935215.1A CN202310935215A CN116679199A CN 116679199 A CN116679199 A CN 116679199A CN 202310935215 A CN202310935215 A CN 202310935215A CN 116679199 A CN116679199 A CN 116679199A
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- 238000001514 detection method Methods 0.000 title claims abstract description 29
- 230000001174 ascending effect Effects 0.000 claims description 4
- 238000004378 air conditioning Methods 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 239000000428 dust Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00978—Control systems or circuits characterised by failure of detection or safety means; Diagnostic methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention relates to the technical field of air conditioner fault detection, and provides a fault detection method of a contactor of an air conditioner heater, which aims to avoid the situation that the actual state of the contactor of the heater cannot be accurately fed back due to factors such as contact dust entering and the like, so that false alarm occurs, and comprises the following steps: after the contactor receives a first control instruction of the attraction contactor for a first preset time, acquiring first state information fed back by the auxiliary contact; if the first state information is that the contactor is in the off state, judging whether the return air temperature and the outlet air temperature of the air conditioner heater meet a first preset condition or not; and if the first preset condition is met, judging that the contactor has suction failure.
Description
Technical Field
The invention relates to the technical field of air conditioner fault detection, in particular to a fault detection method and a fault detection system for an air conditioner heater contactor.
Background
In the related art, a contactor is generally used on an air conditioning heater of a vehicle to be turned on and off, and an auxiliary contact is installed on the contactor to feed back an engaged or off state of the contactor.
However, in the practical application process, the auxiliary contact of the contactor can not accurately feed back the actual state of the contactor of the heater due to factors such as contact ash feeding, so that false alarm occurs, and the reliability of the system is greatly reduced.
Disclosure of Invention
The invention aims to solve the technical problems, and provides a fault detection method for an air conditioner heater contactor, which can comprehensively judge whether the contactor has faults according to state information fed back by an auxiliary contact, the return air temperature and the air outlet temperature of the air conditioner heater, has higher accuracy, and avoids the situation of false alarm, thereby greatly improving the reliability of a system.
The technical scheme adopted by the invention is as follows:
a fault detection method of a contactor of an air conditioner heater, the contactor being correspondingly provided with an auxiliary contact, the fault detection method comprising the steps of: after the contactor receives a first control instruction for sucking the contactor for a first preset time, acquiring first state information fed back by the auxiliary contact; if the first state information is that the contactor is in an off state, judging whether the return air temperature and the outlet air temperature of the air conditioner heater meet a first preset condition or not; and if the first preset condition is met, judging that the contactor has suction failure.
In one embodiment of the present invention, the first preset condition includes: and in the first preset time when the contactor receives the first control instruction, the temperature difference between the return air temperature and the air outlet temperature does not show rising trend.
In one embodiment of the present invention, the first preset condition includes: after the contactor receives the first preset time of the first control instruction, the maximum value of the stable temperature difference between the return air temperature and the air outlet temperature is smaller than the first preset temperature.
In one embodiment of the present invention, the first preset condition includes: after the contactor receives the first preset time of the first control instruction, a first preset time interval exists, and the temperature difference between the return air temperature and the air outlet temperature is in a descending trend.
In one embodiment of the present invention, the failure detection method of the air conditioner heater contactor further comprises: after the contactor is in a normal suction state and the contactor receives a second control instruction for turning off the contactor for a second preset time, second state information fed back by the auxiliary contact is obtained; if the second state information is that the contactor is in the suction state, judging whether the return air temperature and the outlet air temperature of the air conditioner heater meet a second preset condition or not; and if the second preset condition is met, judging that the contactor has a turn-off fault.
In one embodiment of the present invention, the second preset condition includes: and in a second preset time when the contactor receives the second control instruction, the temperature of the air outlet temperature and the temperature of the return air temperature do not show a descending trend.
In one embodiment of the present invention, the second preset condition includes: after the contactor receives the second preset time of the second control instruction, the minimum value of the stable temperature difference between the air outlet temperature and the return air temperature is larger than the second preset temperature.
A fault detection system of a contactor of an air conditioner heater, the contactor being correspondingly provided with an auxiliary contact, the fault detection system comprising: the acquisition module is used for acquiring first state information fed back by the auxiliary contact after the contactor receives a first control instruction for sucking the contactor for a first preset time; the judging module is used for judging whether the return air temperature and the air outlet temperature of the air conditioner heater meet a first preset condition when the first state information is that the contactor is in an off state; and the judging module is used for judging that the contactor has suction failure when the first preset condition is met.
In an embodiment of the present invention, the obtaining module is further configured to obtain second state information fed back by the auxiliary contact after the contactor is in a normal engaging state and the contactor receives a second control instruction for turning off the contactor for a second preset time; the judging module is further configured to judge whether the return air temperature and the outlet air temperature of the air conditioner heater meet a second preset condition when the second state information indicates that the contactor is in the suction state; and the judging module is also used for judging that the contactor has a turn-off fault when the second preset condition is met.
The invention has the beneficial effects that:
the invention can comprehensively judge whether the contactor fails according to the state information fed back by the auxiliary contact, the return air temperature and the air outlet temperature of the air conditioner heater, has higher accuracy, and avoids the situation of false alarm, thereby greatly improving the reliability of the system.
Drawings
Fig. 1 is a flowchart of a failure detection method of a contactor of an air conditioner heater according to an embodiment of the present invention;
fig. 2 is a flowchart of a fault detection method of a contactor of an air conditioner heater according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for detecting a failure of a contactor of an air conditioner heater according to another embodiment of the present invention;
fig. 4 is a block diagram of a failure detection system of a contactor of an air conditioner heater according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the fault detection method of the contactor of the air conditioner heater according to the embodiment of the present invention may include the following steps:
s1, after the contactor receives a first control instruction of the suction contactor for a first preset time, acquiring first state information fed back by the auxiliary contact.
That is, the first control instruction is an instruction to engage the contactor, wherein the first state information may include the contactor being in an off state and the contactor being in an engaged state; the first preset time may be calibrated according to practical situations, for example, may be 30s.
S2, if the first state information is that the contactor is in the off state, judging whether the return air temperature and the outlet air temperature of the air conditioner heater meet a first preset condition.
Specifically, if the first state information fed back by the auxiliary contact is that the contactor is in a suction state, the state is consistent with a first control instruction received by the contactor, which indicates that no abnormality occurs in the auxiliary contact at the moment, and the contactor is also in a normal suction state; if the first state information fed back by the auxiliary contact is that the contactor is in an off state, the state is inconsistent with the first control instruction received by the contactor, which indicates that the contactor may have a suction failure (i.e., the contactor cannot suction) at this time, further judgment can be made according to the return air temperature and the air outlet temperature of the air conditioner heater, i.e., whether the return air temperature and the air outlet temperature of the air conditioner heater meet the first preset condition is judged, so as to judge whether the suction failure occurs in the contactor.
And S3, if the first preset condition is met, judging that the contactor has suction failure.
In one embodiment of the present invention, the first preset condition may include: and in the first preset time when the contactor receives the first control instruction, the temperature difference between the return air temperature and the air outlet temperature does not show rising trend.
As a possible implementation manner, in a first preset time when the contactor receives the first control instruction, calculating a temperature difference between the return air temperature and the air outlet temperature, and obtaining a variation trend of the temperature difference between the return air temperature and the air outlet temperature, if the variation trend of the temperature difference between the return air temperature and the air outlet temperature does not show an ascending trend, judging that the contactor has a suction failure. Taking the first preset time as 30s as an example, if the temperature difference between the return air temperature and the air outlet temperature at the 30s moment and the temperature difference between the return air temperature and the air outlet temperature before the 30s moment are less than 5 ℃ (calibration can be performed according to actual conditions), the change trend of the temperature difference between the return air temperature and the air outlet temperature does not show an ascending trend.
In another embodiment of the present invention, the first preset condition may include: after the contactor receives a first preset time of the first control instruction, the maximum value of the stable temperature difference between the return air temperature and the air outlet temperature is smaller than the first preset temperature.
As another possible implementation manner, after the contactor receives the first preset time of the first control instruction, after the temperature difference between the return air temperature and the air outlet temperature is stable (the difference between the maximum value and the minimum value of the temperature difference in a continuous period of time is less than 2 ℃ (calibration can be performed according to actual conditions), the temperature difference is stable), the stable temperature difference between the return air temperature and the air outlet temperature is calculated, and if the maximum value of the stable temperature difference is less than the first preset temperature (for example, 5 ℃ and calibration can be performed according to actual conditions), the contactor is judged to have the suction fault.
In yet another embodiment of the present invention, the first preset condition may include: after the contactor receives a first preset time of the first control instruction, a first preset time interval exists, and the temperature difference between the return air temperature and the air outlet temperature is in a descending trend.
As still another possible implementation manner, after the contactor receives the first preset time of the first control instruction, in a first preset time interval (for example, within 30 s), the temperature difference between the return air temperature and the air outlet temperature is calculated, the variation trend of the temperature difference between the return air temperature and the air outlet temperature is obtained, if the variation trend of the temperature difference between the return air temperature and the air outlet temperature in the first preset time interval shows a decreasing trend, which indicates that the contactor is abnormally opened during operation, the contactor is judged to have a suction fault. Taking the first preset time as 30s as an example, if the difference between the temperature difference between the return air temperature and the air outlet temperature before the 30s moment and the temperature difference between the return air temperature and the air outlet temperature at the 30s moment is greater than 5 ℃ (calibration can be carried out according to actual conditions), the change trend of the temperature difference between the return air temperature and the air outlet temperature shows a descending trend.
In one embodiment of the present invention, as shown in fig. 2, after a first control command for engaging the contactor is issued by the control device, waiting for 30 seconds, determining whether the auxiliary contact of the contactor feeds back that the contactor is in an off state, and if not, keeping running; if so, it is determined whether the outlet air temperature and the return air temperature satisfy the condition 1 (the first preset condition in the first embodiment), the condition 2 (the first preset condition in the second embodiment), or the condition 3 (the first preset condition in the third embodiment). If not, keeping running; if so, judging whether the first control instruction of the suction contactor is sent out by the control device for 3 times, and if so, judging that the suction failure (suction failure) of the contactor of the heater is caused; if the number of times is less than 3, the control device turns off the first control instruction, and after waiting for 5 seconds, the control device re-sends the first control instruction for sucking the contactor, and after waiting for 30 seconds, the control device continues to judge whether the auxiliary contact of the contactor feeds back the contactor to be in the turn-off state.
Therefore, whether the contactor has the suction failure or not is comprehensively judged according to the state information fed back by the auxiliary contact, the return air temperature and the air outlet temperature of the air conditioner heater.
It will be appreciated that during actual operation, the contactor may also be subject to a shutdown failure (i.e., not open), and how to determine whether the contactor is subject to a shutdown failure will be described in detail below with reference to the specific embodiments.
In one embodiment of the present invention, the failure detection method of the contactor of the air conditioner heater may further include: after the contactor is in a normal suction state and the contactor receives a second control instruction for turning off the contactor for a second preset time, second state information fed back by the auxiliary contact is obtained; if the second state information is that the contactor is in the suction state, judging whether the return air temperature and the air outlet temperature of the air conditioner heater meet a second preset condition or not; if the second preset condition is met, the contactor is judged to have a turn-off fault.
The second control instruction is an instruction for turning off the contactor, wherein the second state information can include that the contactor is in an off state and the contactor is in an attraction state; the second preset time may be calibrated according to practical situations, for example, may be 30s.
Specifically, similar to judging whether the contactor has a suction failure, if the second state information fed back by the auxiliary contact is that the contactor is in an off state, the state is consistent with a second control instruction received by the contactor, which indicates that the auxiliary contact is not abnormal at the moment, and the contactor is also in a normal off state; if the second state information fed back by the auxiliary contact is that the contactor is in the suction state, the state is inconsistent with the second control instruction received by the contactor, which indicates that the contactor may have a turn-off fault (i.e., the contactor cannot be turned off), at this time, further judgment can be made according to the return air temperature and the air outlet temperature of the air conditioner heater, i.e., whether the return air temperature and the air outlet temperature of the air conditioner heater meet the second preset condition is judged, so as to judge whether the contactor has the turn-off fault.
In one embodiment of the present invention, the second preset condition includes: and in a second preset time when the contactor receives the second control instruction, the temperature difference between the air outlet temperature and the return air temperature does not show a descending trend.
As a possible implementation manner, in a second preset time when the contactor receives the second control instruction, calculating a temperature difference between the air outlet temperature and the return air temperature, calculating a variation trend of the temperature difference between the air outlet temperature and the return air temperature, and if the temperature difference between the air outlet temperature and the return air temperature does not show a descending trend, judging that the contactor has a shutdown fault. Taking the second preset time as an example of 30s, if the difference between the temperature difference between the air outlet temperature and the air return temperature before the 30s moment and the temperature difference between the air outlet temperature and the air return temperature at the 30s moment is less than 5 ℃ (calibration can be carried out according to actual conditions), the temperature difference between the air outlet temperature and the air return temperature does not show a descending trend.
In another embodiment of the present invention, the second preset condition includes: after the contactor receives a second preset time of the second control instruction, the minimum value of the stable temperature difference between the air outlet temperature and the return air temperature is larger than the second preset temperature.
As another possible implementation manner, after the contactor receives the second preset time of the second control instruction, after the temperature difference between the air outlet temperature and the return air temperature is stable (the difference between the maximum value and the minimum value of the temperature difference in a period of time is less than 2 ℃ (calibration can be performed according to actual conditions), the temperature difference is stable), a stable temperature difference between the air outlet temperature and the return air temperature is calculated, and if the minimum value of the stable temperature difference is greater than the second preset temperature (for example, 5 ℃ and calibration can be performed according to actual conditions), it is determined that the contactor has a shutdown fault.
In one embodiment of the present invention, as shown in fig. 3, after a second control command for turning off the contactor is issued by the control device, waiting for 30 seconds, determining whether the auxiliary contact of the contactor is in a suction state by feedback, and if not, keeping running; if so, it is determined whether the outlet air temperature and the return air temperature satisfy the condition 1 (the second preset condition in the first embodiment) or the condition 2 (the second preset condition in the second embodiment). If not, keeping running; if so, judging whether the control device sends out a second control instruction for turning off the contactor for 3 times, and if so, turning off the contactor of the heater (continuous turning off) if the second control instruction is 3 times; if the number of the auxiliary contacts is less than 3, the control device turns off the second control command, and after waiting for 5 seconds, the control device re-sends the second control command for turning off the contactor, and after waiting for 30 seconds, the control device continues to judge whether the auxiliary contacts of the contactor feed back the contactor to be in the attraction state.
Therefore, whether the contactor has a turn-off fault is comprehensively judged according to the state information fed back by the auxiliary contact, the return air temperature and the air outlet temperature of the air conditioner heater.
In summary, according to the method for detecting a fault of a contactor of an air conditioner heater in the embodiment of the invention, after the contactor receives the first control instruction of the suction contactor for the first preset time, the first state information fed back by the auxiliary contact is obtained, if the first state information is that the contactor is in the off state, whether the return air temperature and the outlet air temperature of the air conditioner heater meet the first preset condition is judged, and if the first preset condition is met, the suction fault of the contactor is judged. Therefore, whether the contactor fails or not can be comprehensively judged according to the state information fed back by the auxiliary contact, the return air temperature and the air outlet temperature of the air conditioner heater, the accuracy is high, the situation of false alarm is avoided, and the reliability of the system is greatly improved.
The invention also provides a fault detection system of the contactor of the air conditioner heater.
As shown in fig. 4, the failure detection system of the contactor of the air conditioner heater according to the embodiment of the present invention may include: an acquisition module 100, a judgment module 200, and a judgment module 300.
The acquiring module 100 is configured to acquire first state information fed back by the auxiliary contact after the contactor receives a first control instruction of the suction contactor for a first preset time; the judging module 200 is configured to judge whether the return air temperature and the outlet air temperature of the air conditioner heater meet a first preset condition when the first state information indicates that the contactor is in an off state; the determining module 300 is configured to determine that the contactor has a suction failure when the first preset condition is satisfied.
In one embodiment of the present invention, the first preset condition includes: and in the first preset time when the contactor receives the first control instruction, the temperature difference between the return air temperature and the air outlet temperature does not show rising trend. In another embodiment of the present invention, the first preset condition includes: after the contactor receives a first preset time of the first control instruction, the maximum value of the stable temperature difference between the return air temperature and the air outlet temperature is smaller than the first preset temperature. In yet another embodiment of the present invention, the first preset condition includes: after the contactor receives a first preset time of the first control instruction, a first preset time interval exists, and the temperature difference between the return air temperature and the air outlet temperature is in a descending trend.
In one embodiment of the present invention, the obtaining module 100 is further configured to obtain second state information fed back by the auxiliary contact after the contactor is in a normal engaging state and the contactor receives a second control instruction for turning off the contactor for a second preset time; the judging module 200 is further configured to judge whether the return air temperature and the outlet air temperature of the air conditioner heater meet a second preset condition when the second state information indicates that the contactor is in the suction state; the determining module 300 is further configured to determine that the contactor has a shutdown failure when the second preset condition is satisfied. In one embodiment of the present invention, the second preset condition includes: and in a second preset time when the contactor receives the second control instruction, the temperatures of the air outlet temperature and the return air temperature do not show a descending trend.
In another embodiment of the present invention, the second preset condition includes: after the contactor receives a second preset time of the second control instruction, the minimum value of the stable temperature difference between the air outlet temperature and the return air temperature is larger than the second preset temperature.
It should be noted that, for avoiding redundancy, specific embodiments of the failure detection system of the contactor of the air conditioner heater according to the present invention may refer to the embodiments of the failure detection method of the contactor of the air conditioner heater described above, and will not be described in detail herein.
According to the fault detection system of the contactor of the air conditioner heater, the acquisition module acquires the first state information fed back by the auxiliary contact after receiving the first control instruction of the suction contactor for the first preset time, and judges whether the return air temperature and the air outlet temperature of the air conditioner heater meet the first preset condition or not through the judgment module when the first state information is that the contactor is in the off state, and judges that the suction fault occurs to the contactor when the judgment module meets the first preset condition. Therefore, whether the contactor fails or not can be comprehensively judged according to the state information fed back by the auxiliary contact, the return air temperature and the air outlet temperature of the air conditioner heater, the accuracy is high, the situation of false alarm is avoided, and the reliability of the system is greatly improved.
In the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. The meaning of "a plurality of" is two or more, unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (4)
1. A fault detection method for a contactor of an air conditioner heater, wherein the contactor is correspondingly provided with an auxiliary contact, the fault detection method comprising the following steps:
after the contactor receives a first control instruction for sucking the contactor for a first preset time, acquiring first state information fed back by the auxiliary contact;
if the first state information is that the contactor is in an off state, judging whether the return air temperature and the air outlet temperature of the air conditioner heater meet a first preset condition, wherein the first preset condition comprises that the temperature difference between the return air temperature and the air outlet temperature does not show an ascending trend within a first preset time when the contactor receives the first control instruction, or comprises that the maximum value of the stable temperature difference between the return air temperature and the air outlet temperature is smaller than the first preset temperature after the contactor receives the first preset time when the contactor receives the first control instruction, or comprises that a first preset time interval exists after the contactor receives the first preset time when the temperature difference between the return air temperature and the air outlet temperature shows a descending trend;
and if the first preset condition is met, judging that the contactor has suction failure.
2. The fault detection method of a contactor of an air conditioner heater according to claim 1, further comprising:
after the contactor is in a normal suction state and the contactor receives a second control instruction for turning off the contactor for a second preset time, second state information fed back by the auxiliary contact is obtained;
if the second state information is that the contactor is in the suction state, judging whether the return air temperature and the outlet air temperature of the air conditioner heater meet a second preset condition, wherein the second preset condition comprises that the temperatures of the outlet air temperature and the return air temperature do not show a descending trend within a second preset time when the contactor receives the second control instruction, or that the minimum value of the stable temperature difference between the outlet air temperature and the return air temperature is larger than a second preset temperature after the contactor receives the second preset time when the contactor receives the second control instruction;
and if the second preset condition is met, judging that the contactor has a turn-off fault.
3. A fault detection system of a contactor of an air conditioner heater, wherein the contactor is correspondingly provided with an auxiliary contact, the fault detection system comprising:
the acquisition module is used for acquiring first state information fed back by the auxiliary contact after the contactor receives a first control instruction for sucking the contactor for a first preset time;
the judging module is used for judging whether the return air temperature and the air outlet temperature of the air conditioner heater meet a first preset condition or not when the first state information is that the contactor is in an off state, wherein the first preset condition comprises that the temperature difference between the return air temperature and the air outlet temperature does not show an ascending trend within a first preset time when the contactor receives the first control instruction, or comprises that the maximum value of the stable temperature difference between the return air temperature and the air outlet temperature is smaller than the first preset temperature after the contactor receives the first preset time when the contactor receives the first control instruction, or comprises that the temperature difference between the return air temperature and the air outlet temperature shows a descending trend within a first preset time interval after the contactor receives the first preset time of the first control instruction;
and the judging module is used for judging that the contactor has suction failure when the first preset condition is met.
4. The failure detection system of a contactor of an air conditioner heater according to claim 3, wherein,
the acquisition module is further used for acquiring second state information fed back by the auxiliary contact after the contactor is in a normal suction state and the contactor receives a second control instruction for turning off the contactor for a second preset time;
the judging module is further configured to judge whether the return air temperature and the outlet air temperature of the air-conditioning heater meet a second preset condition when the second state information is that the contactor is in an actuation state, where the second preset condition includes that the temperatures of the outlet air temperature and the return air temperature do not show a decreasing trend within a second preset time when the contactor receives the second control instruction, or includes that after the contactor receives the second preset time of the second control instruction, a minimum value of a stable temperature difference between the outlet air temperature and the return air temperature is greater than a second preset temperature;
and the judging module is also used for judging that the contactor has a turn-off fault when the second preset condition is met.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310935215.1A CN116679199A (en) | 2023-07-28 | 2023-07-28 | Failure detection method and system for contactor of air conditioner heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310935215.1A CN116679199A (en) | 2023-07-28 | 2023-07-28 | Failure detection method and system for contactor of air conditioner heater |
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Cited By (1)
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| CN116890603A (en) * | 2023-09-11 | 2023-10-17 | 新誉集团有限公司 | Failure detection method and system for contactor of air conditioner blower |
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