CN111197240B - Washing machine motor fault detection method and device and washing machine - Google Patents
Washing machine motor fault detection method and device and washing machine Download PDFInfo
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- CN111197240B CN111197240B CN201811274948.0A CN201811274948A CN111197240B CN 111197240 B CN111197240 B CN 111197240B CN 201811274948 A CN201811274948 A CN 201811274948A CN 111197240 B CN111197240 B CN 111197240B
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- 238000005406 washing Methods 0.000 title claims abstract description 197
- 238000001514 detection method Methods 0.000 title claims abstract description 54
- 230000002159 abnormal effect Effects 0.000 claims abstract description 52
- 238000000034 method Methods 0.000 claims abstract description 48
- 230000008569 process Effects 0.000 claims description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 37
- 238000004590 computer program Methods 0.000 claims description 18
- 230000007257 malfunction Effects 0.000 claims description 7
- 230000018044 dehydration Effects 0.000 claims description 5
- 238000006297 dehydration reaction Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
- D06F37/30—Driving arrangements
- D06F37/304—Arrangements or adaptations of electric motors
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Abstract
The invention provides a washing machine motor fault detection method and device and a washing machine. The method for detecting the motor fault of the washing machine comprises the following steps: collecting the counter electromotive force generated by a motor in the current washing process, and converting the counter electromotive force into a pulse signal; detecting a pulse signal; judging whether the pulse signal meets a preset condition corresponding to the current washing process, if so, judging that the motor is normal; if not, judging that the motor is abnormal. The invention can effectively detect whether the working state of the motor is abnormal or not through the feedback signal of the hardware circuit and the judgment processing of the software program, and can judge which working condition is abnormal, thereby achieving the purpose of early finding and early reminding and early intervention and avoiding the problem of damaging the motor, the clothes of a user and the washing performance.
Description
Technical Field
The invention relates to the technical field of washing machines, in particular to a washing machine motor fault detection method, a washing machine motor fault detection device and a washing machine.
Background
With the increasing popularity of household appliances, more and more households rely on washing laundry using washing machines. Whether each electric device of the washing machine can work normally or not has great influence on the normal operation and the washing quality of the washing machine. The detection of the present washing machine electric device, the parts which have great influence on the safety and the water level sensor and the door switch, are subjected to deep detection and artificial safety protection treatment, but the working state and the working performance of the motor are not detected and treated. The problems of stalling, unidirectional rotation, locked rotation, blocked rotation and the like of the motor under abnormal conditions damage the motor and clothes in the washing machine to a certain extent, thereby greatly reducing the washing quality.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, an aspect of the present invention is to provide a method for detecting a malfunction of a motor of a washing machine.
Another aspect of the present invention is to provide a washing machine motor failure detecting apparatus.
Yet another aspect of the present invention is to provide a washing machine.
In view of this, the present invention provides a method for detecting a motor fault of a washing machine, including: collecting the counter electromotive force generated by a motor in the current washing process, and converting the counter electromotive force into a pulse signal; detecting a pulse signal; judging whether the pulse signal meets a preset condition corresponding to the current washing process, if so, judging that the motor is normal; if not, judging that the motor is abnormal.
According to the washing machine motor fault detection method, counter electromotive force is generated by forward rotation and stop or reverse rotation and stop of the motor in the washing process, the counter electromotive force generated by the motor in the current washing process is collected through the hardware circuit and is converted into the pulse signal, the pulse signal is detected through the software program, whether the working state of the motor is abnormal or not is judged by judging whether the pulse signal meets the preset condition corresponding to the current washing process or not, if so, the motor is normal, otherwise, the motor is abnormal. The washing machine motor fault detection method provided by the invention can effectively detect whether the working state of the motor is abnormal or not through the judgment and the processing of the hardware circuit feedback signal and the software program, and can judge which working condition is abnormal, thereby achieving the purpose of early finding and early reminding and early intervention and avoiding the problem of damage to the motor, the user clothes and the washing performance.
In the above technical solution, preferably, the step of determining whether the pulse signal meets a preset condition corresponding to the current washing process includes: when the current washing process is a water inlet process or a water drainage process, if a pulse signal is detected, timing is started; when the timing time is equal to a first preset time, judging whether the accumulated value of the pulse signals is greater than a first preset threshold value or not; if so, judging that the pulse signal does not meet the preset condition.
In the technical scheme, if the current washing process is a water inlet or water discharge process, under a normal condition, the motor does not need to rotate, and no counter electromotive force is generated. In the two washing processes, if the pulse signal is detected, it is indicated that the motor state may be abnormal (rotation occurs when the motor does not rotate), and a judgment condition needs to be further added to accurately judge the motor state. Specifically, when the pulse signal is detected, timing is started, the pulse signal is still increased within a first preset time, or the accumulated value of the pulse signal is greater than a first preset threshold value, and the pulse signal is judged to be not in accordance with the preset condition of the current washing process.
In any of the above technical solutions, preferably, the step of determining whether the pulse signal meets a preset condition corresponding to the current washing process includes: when the current washing process is a washing process or a dewatering process, timing is started; when the timing time is equal to a second preset time, judging whether the accumulated value of the pulse signals is larger than a second preset threshold value or not; if the pulse signal is smaller than the preset condition, the pulse signal is judged to be not in accordance with the preset condition.
In the technical scheme, if the current washing process is a washing process, the motor can repeatedly perform four steps of forward rotation, stopping, reverse rotation and stopping, and clothes are cleaned by virtue of the forward and reverse forces of water flow; the motor can generate back electromotive force when the motor rotates forwards or stops; the motor can generate back electromotive force when the motor rotates reversely and stops. If the current washing process is a dewatering process, the motor will repeatedly rotate forward and stop for a long time, and the generation of counter electromotive force will be inevitable. Therefore, in the two washing processes, the judgment basis is that a certain amount of pulse signals must be detected, and if the certain amount of pulse signals cannot be detected, the motor is likely to not rotate or rotate unsmoothly, jam or jam when the motor should rotate. Specifically, after the washing process or the dewatering process is started, timing is started, and if the accumulated value of the pulse signals is smaller than a second preset threshold value or no pulse signals are detected at all within a second preset time, the pulse signals are judged to be not in accordance with the preset conditions.
In any of the above technical solutions, preferably, the method for detecting a motor fault of a washing machine further includes: when the pulse signal is judged not to accord with the preset condition, recording the times that the pulse signal does not accord with the preset condition; clearing the accumulated value of the pulse signals, and repeatedly judging whether the pulse signals meet the preset conditions corresponding to the current washing process; and if the pulse signals are judged to be not in accordance with the preset conditions for the continuous preset times, judging that the motor is abnormal.
In the technical scheme, the value range of the preset times is more than or equal to 2 times, preferably, the preset times is 3 times, and here, taking 3 times as an example for explanation, when it is determined that the pulse signal does not meet the preset condition corresponding to the current washing process for the first time, the number of times that the pulse signal does not meet the preset condition is recorded, then the accumulated value of the current pulse signal is cleared, and whether the pulse signal meets the preset condition is continuously determined for the second time.
In any of the above technical solutions, preferably, the method for detecting a motor fault of a washing machine further includes: and when the motor is judged to be abnormal, the motor is powered off, and an alarm is given.
In the technical scheme, when the motor is judged to be abnormal, the power supply of the motor is immediately cut off, and alarming, such as sound alarming and fault code EX displaying, is carried out2The frequency and the reason of the motor faults are determined, and a user is prompted to check and maintain, so that the purposes of protecting the motor, protecting clothes and improving the washing quality are achieved.
The invention also provides a washing machine motor fault detection device, which comprises: the detection circuit is used for collecting the counter electromotive force generated by the motor in the current washing process and converting the counter electromotive force into a pulse signal; a memory for storing a computer program; a processor for executing a computer program to: detecting a pulse signal; judging whether the pulse signal meets a preset condition corresponding to the current washing process, if so, judging that the motor is normal; if not, judging that the motor is abnormal.
According to the motor fault detection device of the washing machine, counter electromotive force is generated by forward rotation or stop or reverse rotation or stop of the motor in the washing process, the counter electromotive force generated by the motor in the current washing process is collected through the detection circuit and converted into the pulse signal, the pulse signal is detected through the software program, whether the working state of the motor is abnormal or not is judged by judging whether the pulse signal meets the preset condition corresponding to the current washing process or not, if yes, the motor is normal, and otherwise, the motor is abnormal. The washing machine motor fault detection device provided by the invention can effectively detect whether the working state of the motor is abnormal or not through the judgment and the processing of the hardware circuit feedback signal and the software program, and can judge which working condition is abnormal, thereby achieving the purpose of early finding and early reminding and early intervention and avoiding the problem of damage to the motor, the clothes of a user and the washing performance.
In the foregoing technical solution, preferably, the processor is specifically configured to execute a computer program to: when the current washing process is a water inlet process or a water drainage process, if a pulse signal is detected, timing is started; when the timing time is equal to a first preset time, judging whether the accumulated value of the pulse signals is greater than a first preset threshold value or not; if the pulse signal is larger than the preset condition, the pulse signal is judged to be not in accordance with the preset condition.
In the technical scheme, if the current washing process is a water inlet or water discharge process, under a normal condition, the motor does not need to rotate, and no counter electromotive force is generated. In the two washing processes, if the pulse signal is detected, it is indicated that the motor state may be abnormal (rotation occurs when the motor does not rotate), and a judgment condition needs to be further added to accurately judge the motor state. Specifically, when the pulse signal is detected, timing is started, the pulse signal is still increased within a first preset time, or the accumulated value of the pulse signal is greater than a first preset threshold value, and the pulse signal is judged to be not in accordance with the preset condition of the current washing process.
In any of the above technical solutions, preferably, the processor is specifically configured to execute a computer program to: when the current washing process is a washing process or a dewatering process, timing is started; when the timing time is equal to a second preset time, judging whether the accumulated value of the pulse signals is larger than a second preset threshold value or not; if the pulse signal is smaller than the preset condition, the pulse signal is judged to be not in accordance with the preset condition.
In the technical scheme, if the current washing process is a washing process, the motor can repeatedly perform four steps of forward rotation, stopping, reverse rotation and stopping, and clothes are cleaned by virtue of the forward and reverse forces of water flow; the motor can generate back electromotive force when the motor rotates forwards or stops; the motor can generate back electromotive force when the motor rotates reversely and stops. If the current washing process is a dewatering process, the motor will repeatedly rotate forward and stop for a long time, and inevitably generate back electromotive force. Therefore, in the two washing processes, the judgment basis is that a certain amount of pulse signals must be detected, and if the certain amount of pulse signals cannot be detected, the motor is likely to not rotate or rotate unsmoothly, jam or jam when the motor should rotate. Specifically, after the washing process or the dewatering process is started, timing is started, and if the accumulated value of the pulse signals is smaller than a second preset threshold value or no pulse signals are detected at all within a second preset time, the pulse signals are judged to be not in accordance with the preset conditions.
In any of the above technical solutions, preferably, the processor is further configured to execute the computer program to: when the pulse signal is judged not to accord with the preset condition, recording the times that the pulse signal does not accord with the preset condition; clearing the accumulated value of the pulse signals, and repeatedly judging whether the pulse signals meet the preset conditions corresponding to the current washing process; and if the pulse signals are judged to be not in accordance with the preset conditions for the continuous preset times, judging that the motor is abnormal.
In the technical scheme, the value range of the preset times is more than or equal to 2 times, preferably, the preset times is 3 times, and here, taking 3 times as an example for explanation, when it is determined that the pulse signal does not meet the preset condition corresponding to the current washing process for the first time, the number of times that the pulse signal does not meet the preset condition is recorded, then the accumulated value of the current pulse signal is cleared, and whether the pulse signal meets the preset condition is continuously determined for the second time.
In any of the above technical solutions, preferably, the processor is further configured to execute the computer program to: and when the motor is judged to be abnormal, the motor is powered off, and an alarm is given.
In the technical scheme, when the motor is judged to be abnormal, the power supply of the motor is immediately cut offAnd performing an alarm, e.g. audible alarm, display of fault code EX2The frequency and the reason of the motor faults are determined, and a user is prompted to check and maintain, so that the purposes of protecting the motor, protecting clothes and improving the washing quality are achieved.
The present invention also proposes a washing machine comprising: the washing machine motor fault detection device of any one of the above technical solutions.
The washing machine provided by the invention comprises the washing machine motor fault detection device in any one of the technical schemes, so that the washing machine motor fault detection device has all the beneficial effects and is not repeated.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 illustrates a flow diagram of a washing machine motor fault detection method according to an embodiment of the present invention;
FIG. 2 illustrates a flow chart diagram of a washing machine motor fault detection method according to another embodiment of the present invention;
FIG. 3 illustrates a flow chart diagram of a washing machine motor fault detection method according to still another embodiment of the present invention;
FIG. 4 illustrates a schematic block diagram of a washing machine motor malfunction detection apparatus according to an embodiment of the present invention;
FIG. 5 shows a schematic diagram of a detection circuit according to a specific embodiment of the present invention;
FIG. 6 is a flowchart illustrating a method for detecting a malfunction of a motor of a washing machine according to an embodiment of the present invention;
fig. 7 illustrates a schematic block diagram of a washing machine according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
As shown in fig. 1, a flow chart of a washing machine motor fault detection method according to an embodiment of the present invention is schematically shown. The washing machine motor fault detection method comprises the following steps:
102, collecting counter electromotive force generated by a motor in the current washing process, and converting the counter electromotive force into a pulse signal;
and step 110, if not, judging that the motor is abnormal.
According to the method for detecting the motor fault of the washing machine, provided by the embodiment of the invention, the motor can generate the counter electromotive force due to forward rotation and stop or reverse rotation and stop in the washing process, the counter electromotive force generated by the motor in the current washing process is collected through the hardware circuit and is converted into the pulse signal, the pulse signal is detected through the software program, whether the working state of the motor is abnormal or not is judged by judging whether the pulse signal meets the preset condition corresponding to the current washing process or not, if so, the motor is normal, and otherwise, the motor is abnormal. The washing machine motor fault detection method provided by the invention can effectively detect whether the working state of the motor is abnormal or not through the judgment and the processing of the hardware circuit feedback signal and the software program, and can judge which working condition is abnormal, thereby achieving the purpose of early finding and early reminding and early intervention and avoiding the problem of damage to the motor, the user clothes and the washing performance.
As shown in fig. 2, a flow chart of a washing machine motor fault detection method according to another embodiment of the present invention is schematically shown. The washing machine motor fault detection method comprises the following steps:
and step 212, if the current value is larger than the preset value, judging that the motor is abnormal.
In this embodiment, if the current washing process is a water intake or discharge process, there is no generation of counter electromotive force without the motor rotating under normal conditions. In the two washing processes, if the pulse signal is detected, it is indicated that the motor state may be abnormal (rotation occurs when the motor does not rotate), and a judgment condition needs to be further added to accurately judge the motor state. Specifically, when the pulse signal is detected, timing is started, the pulse signal is still increased within a first preset time, or the accumulated value of the pulse signal is greater than a first preset threshold value, and the pulse signal is judged to be not in accordance with the preset condition of the current washing process.
As shown in fig. 3, a flow chart of a washing machine motor fault detection method according to still another embodiment of the present invention is schematically shown. The washing machine motor fault detection method comprises the following steps:
In this embodiment, if the current washing process is a washing process, the motor repeats four steps of forward rotation, stop, reverse rotation and stop, and the clothes are cleaned by the forward and reverse forces of the water flow; the motor can generate back electromotive force when the motor rotates forwards or stops; the motor can generate back electromotive force when the motor rotates reversely and stops. If the current washing process is a dewatering process, the motor will repeatedly rotate forward and stop for a long time, and the generation of counter electromotive force will be inevitable. Therefore, in the two washing processes, the judgment basis is that a certain amount of pulse signals must be detected, and if the certain amount of pulse signals cannot be detected, the motor is likely to not rotate or rotate unsmoothly, jam or jam when the motor should rotate. Specifically, after the washing process or the dewatering process is started, timing is started, and if the accumulated value of the pulse signals is smaller than a second preset threshold value or no pulse signals are detected at all within a second preset time, the pulse signals are judged to be not in accordance with the preset conditions.
In any of the above embodiments, preferably, the method for detecting a motor failure of a washing machine further includes: when the pulse signal is judged not to accord with the preset condition, recording the times that the pulse signal does not accord with the preset condition; clearing the accumulated value of the pulse signals, and repeatedly judging whether the pulse signals meet the preset conditions corresponding to the current washing process; and if the pulse signals are judged to be not in accordance with the preset conditions for the continuous preset times, judging that the motor is abnormal.
In this embodiment, the value range of the preset number of times is greater than or equal to 2 times, preferably, the preset number of times is 3 times, where 3 times are taken as an example to explain, when it is determined that the pulse signal does not meet the preset condition corresponding to the current washing process for the first time, the number of times that the pulse signal does not meet the preset condition is recorded, then the accumulated value of the current pulse signal is cleared, and it is determined whether the pulse signal meets the preset condition for the second time.
In any of the above embodiments, preferably, the method for detecting a motor failure of a washing machine further includes: and when the motor is judged to be abnormal, the motor is powered off, and an alarm is given.
In this embodiment, when the motor is judged to be abnormal, the power supply to the motor is immediately cut off, and an alarm such as an audible alarm and display of the fault code EX is given2The frequency and the reason of the motor faults are determined, and a user is prompted to check and maintain, so that the purposes of protecting the motor, protecting clothes and improving the washing quality are achieved.
As shown in fig. 4, a schematic block diagram of a washing machine motor malfunction detection apparatus according to an embodiment of the present invention. Wherein, this washing machine motor fault detection device 400 includes:
the detection circuit 402 is used for collecting the counter electromotive force generated by the motor in the current washing process and converting the counter electromotive force into a pulse signal;
a memory 404 for storing a computer program;
a processor 406 for executing a computer program to: detecting a pulse signal; judging whether the pulse signal meets a preset condition corresponding to the current washing process, if so, judging that the motor is normal; if not, judging that the motor is abnormal.
In the washing machine motor fault detection device 400 provided by the embodiment of the invention, the motor generates back electromotive force due to forward rotation, stop, or reverse rotation and stop in the washing process, the back electromotive force generated by the motor in the current washing process is collected through the detection circuit 402, the back electromotive force is converted into a pulse signal, the pulse signal is detected through a software program, whether the working state of the motor is abnormal or not is judged by judging whether the pulse signal meets the preset condition corresponding to the current washing process or not, if so, the motor is normal, otherwise, the motor is abnormal. The washing machine motor fault detection device 400 provided by the invention can effectively detect whether the working state of the motor is abnormal or not through the judgment and the processing of the hardware circuit feedback signal and the software program, and can judge which working condition is abnormal, thereby achieving the purpose of early finding and early reminding and early intervening and avoiding the problem of damage to the motor, the clothes of a user and the washing performance.
In one embodiment of the present invention, the processor 406 is preferably specifically configured to execute a computer program to: when the current washing process is a water inlet process or a water drainage process, if a pulse signal is detected, timing is started; when the timing time is equal to a first preset time, judging whether the accumulated value of the pulse signals is greater than a first preset threshold value or not; if so, judging that the pulse signal does not meet the preset condition.
In this embodiment, if the current washing process is a water intake or discharge process, there is no generation of counter electromotive force without the motor rotating under normal conditions. In the two washing processes, if the pulse signal is detected, it is indicated that the motor state may be abnormal (rotation occurs when the motor does not rotate), and a judgment condition needs to be further added to accurately judge the motor state. Specifically, when the pulse signal is detected, timing is started, the pulse signal is still increased within a first preset time, or the accumulated value of the pulse signal is greater than a first preset threshold value, and the pulse signal is judged to be not in accordance with the preset condition of the current washing process.
In one embodiment of the present invention, the processor 406 is preferably specifically configured to execute a computer program to: when the current washing process is a washing process or a dewatering process, timing is started; when the timing time is equal to a second preset time, judging whether the accumulated value of the pulse signals is larger than a second preset threshold value or not; if the pulse signal is smaller than the preset condition, the pulse signal is judged to be not in accordance with the preset condition.
In this embodiment, if the current washing process is a washing process, the motor repeats four steps of forward rotation, stop, reverse rotation and stop, and the clothes are cleaned by the forward and reverse forces of the water flow; the motor can generate counter electromotive force when the motor rotates forwards or stops; the motor can generate back electromotive force when the motor rotates reversely and stops. If the current washing process is a dewatering process, the motor will repeatedly rotate forward and stop for a long time, and the generation of counter electromotive force will be inevitable. Therefore, in the two washing processes, the judgment basis is that a certain amount of pulse signals must be detected, and if the certain amount of pulse signals cannot be detected, the motor is likely to not rotate or rotate unsmoothly, jam or jam when the motor should rotate. Specifically, after the washing process or the dewatering process is started, timing is started, and if the accumulated value of the pulse signals is smaller than a second preset threshold value or no pulse signals are detected at all within a second preset time, the pulse signals are judged to be not in accordance with the preset conditions.
In one embodiment of the present invention, the processor 406 is preferably further configured to execute the computer program to: when the pulse signal is judged not to accord with the preset condition, recording the times that the pulse signal does not accord with the preset condition; clearing the accumulated value of the pulse signals, and repeatedly judging whether the pulse signals meet the preset condition corresponding to the current washing process; and if the pulse signals are judged to be not in accordance with the preset conditions for the continuous preset times, judging that the motor is abnormal.
In this embodiment, the value range of the preset number of times is greater than or equal to 2 times, preferably, the preset number of times is 3 times, where 3 times are taken as an example to explain, when it is determined that the pulse signal does not meet the preset condition corresponding to the current washing process for the first time, the number of times that the pulse signal does not meet the preset condition is recorded, then the accumulated value of the current pulse signal is cleared, and it is determined whether the pulse signal meets the preset condition for the second time.
In one embodiment of the present invention, the processor 406 is preferably further configured to execute the computer program to: and when the motor is judged to be abnormal, the motor is powered off, and an alarm is given.
In the embodiment, when the motor is judged to be abnormal, the power supply of the motor is immediately cut off, and alarms such as sound alarm and fault code EX2 are given out to determine the frequency and reason of the motor fault and prompt a user to check and maintain, so that the purposes of protecting the motor and clothes and improving the washing quality are achieved.
The device comprises a detection circuit, as shown in fig. 5, the detection circuit is composed of a single chip microcomputer U1, an optocoupler U2, a triode Q1, a motor, a part of resistor and a capacitor element.
The motor is powered in the forward rotation mode, the motor starts the forward rotation mode, the power of the motor is cut off, the motor stops, the port of the motor can generate reverse electromotive force at the moment, the reverse electromotive force is changed into a pulse signal after passing through the optocoupler U2 and then is input into the single chip microcomputer U1 through the triode Q1, and the single chip microcomputer U1 carries out software algorithm judgment.
The motor is reversely powered, the motor starts to reversely rotate, the power of the motor is cut off, the motor stops, the port of the motor can generate reverse electromotive force at the moment, the reverse electromotive force is changed into a pulse signal after passing through the optocoupler U2 and then is input into the single chip microcomputer U1 through the triode Q1, and the single chip microcomputer U1 carries out software algorithm judgment.
The software detection principle of the single chip microcomputer U1 is as follows:
the user selects the washing parameters, and after the washing is started, the single chip microcomputer U1 judges which of the four washing processes of water inlet, washing, water drainage and dehydration is currently used, and the four washing processes can be repeatedly carried out in the whole washing stage until the washing is finished.
If the water inlet or the water discharge process is carried out currently, the motor does not need to rotate, and the judgment basis is that no back electromotive force is generated. If the single chip microcomputer U1 detects that a pulse signal exists, the state of the motor is possibly abnormal, the judgment condition is continuously increased, the pulse signals are still accumulated in a period of time, the current pulse signal is judged to be inconsistent with the judgment basis, the recording is carried out for 1 time, then the current accumulated pulse signal is emptied, and the 2 nd repeated detection is continuously carried out. If the current pulse signal is detected to be inconsistent with the judgment basis for 3 times continuously, the single chip microcomputer U1 judges that the motor has a fault, immediately cuts off the power of the motor, gives an alarm, displays a fault code EX1 and prompts a user that the motor rotates abnormally.
If the washing process is currently performed, the motor can repeatedly perform four steps of forward rotation, stopping, reverse rotation and stopping. The motor can generate reverse electromotive force when the motor rotates forwards and stops, and can generate reverse electromotive force when the motor rotates backwards and stops. The decision is based on the fact that a certain amount of pulse signals has to be detected. If the single chip microcomputer U1 does not detect the pulse signal or the accumulated value of the pulse signal is smaller within a certain time, the state of the motor is possibly abnormal, the judgment condition is continuously increased, if the pulse signal is not detected in the forward rotation (or reverse rotation) of the motor for a plurality of times continuously or the accumulated value of the pulse signal is smaller, the current pulse signal is judged to be inconsistent with the judgment basis, 1 time is recorded, then the current accumulated pulse signal is cleared, the 2 nd repeated detection is continuously carried out, if the current pulse signal is detected to be inconsistent with the judgment basis for 3 times continuously, the single chip microcomputer U1 judges that the motor has a fault, the motor is immediately powered off, the alarm is carried out, the fault code EX2 is displayed, and a user is prompted that the motor rotates abnormally.
If the current dehydration process is adopted, the motor can repeat two steps of forward rotation and stop for a long time, and the reverse electromotive force is inevitably generated when clicking. The judgment is based on the requirement that the accumulated value of the pulses exceeds the average value within a certain time, such as 5 minutes. Firstly, timing is started, the single chip microcomputer U1 detects pulse signals in the time, but the judgment is not carried out, after 5 minutes, the single chip microcomputer U1 judges whether the accumulated value of the current pulse signals is smaller than the average value, if the accumulated value is smaller than the average value, the motor state is possibly abnormal, 1 time of recording is carried out, then the current accumulated pulse signals are cleared, and the 2 nd repeated detection is carried out continuously. If the current signal is detected to be inconsistent with the judgment for 3 times continuously, the single chip microcomputer U1 judges that the motor has a fault, the motor is immediately powered off, an alarm is given, a fault code EX3 is displayed, and a user is prompted to abnormally rotate the motor.
Software detection flow of the single chip microcomputer U1 is shown in fig. 6:
and step 618, alarming if the motor is abnormal.
The washing machine motor fault detection device provided by the specific embodiment of the invention jointly determines the frequency and reason of motor faults through hardware circuit feedback signals and software program judgment processing, thereby giving an alarm, prompting a user to check and repair, achieving the purpose of early finding and early reminding and early intervention, and avoiding the problem of damage to the motor, the clothes of the user and the washing performance.
As shown in fig. 7, a schematic block diagram of a washing machine according to an embodiment of the present invention. Wherein, this washing machine 700 includes: the washing machine motor failure detection apparatus 702 according to any of the above embodiments.
The washing machine 700 provided by the embodiment of the present invention includes the washing machine motor fault detection apparatus 702 according to any one of the above embodiments, so that the washing machine motor fault detection apparatus 702 has all the beneficial effects, and details are not repeated.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A washing machine motor fault detection method is characterized by comprising the following steps:
after the clothes are washed, judging which of the four washing processes of water inlet, washing, water drainage and dehydration is currently carried out, collecting counter electromotive force generated by the motor in the current washing process, and converting the counter electromotive force into a pulse signal;
detecting the pulse signal;
judging whether the pulse signal meets a preset condition corresponding to the current washing process; if so, judging that the motor is normal; if not, judging that the motor is abnormal.
2. The method for detecting the motor fault of the washing machine as claimed in claim 1, wherein the step of judging whether the pulse signal meets the preset condition corresponding to the current washing process specifically comprises:
when the current washing process is a water inlet process or a water drainage process, if the pulse signal is detected, timing is started;
when the timing time is equal to a first preset time, judging whether the accumulated value of the pulse signals is greater than a first preset threshold value or not;
if so, judging that the pulse signal does not meet the preset condition.
3. The method for detecting the motor fault of the washing machine as claimed in claim 1, wherein the step of judging whether the pulse signal meets the preset condition corresponding to the current washing process specifically comprises:
when the current washing process is a washing process or a dewatering process, timing is started;
when the timing time is equal to a second preset time, judging whether the accumulated value of the pulse signals is larger than a second preset threshold value or not;
if the pulse signal is smaller than the preset condition, the pulse signal is judged to be not in accordance with the preset condition.
4. The washing machine motor malfunction detection method according to claim 2 or 3, further comprising:
when the pulse signal is judged not to accord with the preset condition, recording the times that the pulse signal does not accord with the preset condition;
clearing the accumulated value of the pulse signals, and repeatedly judging whether the pulse signals meet the preset conditions corresponding to the current washing process;
and if the pulse signals are judged to be not in accordance with the preset conditions for the continuous preset times, judging that the motor is abnormal.
5. The washing machine motor malfunction detection method according to any one of claims 1 to 3, further comprising:
and when the motor is judged to be abnormal, the motor is powered off, and an alarm is given.
6. A washing machine motor fault detection device, characterized by comprising:
the detection circuit is used for collecting the counter electromotive force generated by the motor in the current washing process and converting the counter electromotive force into a pulse signal;
a memory for storing a computer program;
a processor for executing the computer program to: after the clothes are washed, judging which of the four washing processes of water inlet, washing, water drainage and dehydration is currently carried out, and detecting the pulse signal; judging whether the pulse signal meets a preset condition corresponding to the current washing process; if so, judging that the motor is normal; if not, judging that the motor is abnormal.
7. The washing machine motor fault detection apparatus of claim 6, wherein the processor is specifically configured to execute the computer program to:
when the current washing process is a water inlet process or a water drainage process, if the pulse signal is detected, timing is started;
when the timing time is equal to a first preset time, judging whether the accumulated value of the pulse signals is greater than a first preset threshold value or not;
if the pulse signal is larger than the preset condition, the pulse signal is judged to be not in accordance with the preset condition.
8. The washing machine motor fault detection apparatus of claim 6, wherein the processor is specifically configured to execute the computer program to:
when the current washing process is a washing process or a dewatering process, timing is started;
when the timing time is equal to a second preset time, judging whether the accumulated value of the pulse signals is larger than a second preset threshold value or not;
if the pulse signal is smaller than the preset condition, the pulse signal is judged to be not in accordance with the preset condition.
9. A washing machine motor fault detection apparatus as claimed in claim 6 or 7 wherein the processor is further configured to execute the computer program to:
when the pulse signal is judged not to accord with the preset condition, recording the times that the pulse signal does not accord with the preset condition;
clearing the accumulated value of the pulse signals, and repeatedly judging whether the pulse signals meet the preset conditions corresponding to the current washing process;
and if the pulse signals are judged to be not in accordance with the preset conditions for the continuous preset times, judging that the motor is abnormal.
10. A washing machine motor fault detection apparatus as claimed in any of claims 6 to 8, wherein the processor is further configured to execute the computer program to:
and when the motor is judged to be abnormal, the motor is powered off, and an alarm is given.
11. A washing machine, characterized by comprising:
the washing machine motor malfunction detection apparatus of any one of claims 6 to 10.
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| CN201811274948.0A CN111197240B (en) | 2018-10-30 | 2018-10-30 | Washing machine motor fault detection method and device and washing machine |
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| CN201811274948.0A CN111197240B (en) | 2018-10-30 | 2018-10-30 | Washing machine motor fault detection method and device and washing machine |
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| CN111870201A (en) * | 2020-08-04 | 2020-11-03 | 上海明略人工智能(集团)有限公司 | Method and device for determining faults of dish washing machine and storage medium |
| CN115161954B (en) * | 2022-05-30 | 2023-06-30 | 山东浪潮创新创业科技有限公司 | Control method and control device of portable cleaner |
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| CN1547633A (en) * | 2002-05-16 | 2004-11-17 | Lg电子株式会社 | Apparatus and method for detecting malfunction of a clutch of washing machine |
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