JP5197394B2 - Electric washing machine - Google Patents

Description

  The present invention relates to an electric washing machine that notifies an abnormality when an abnormality occurs in a rotation sensor of a rotating tub.

  Conventionally, in an electric washing machine including a brake device that brakes and stops the rotating tub, the electric washing machine includes a rotation sensor that detects the rotation speed of the rotating tub, and when the set time has elapsed after the start of braking the rotating tub Detects the rotation speed of the rotating tank, detects that the brake device is abnormal when the detected rotation speed exceeds the reference value for abnormality determination, and turns on the brake abnormality indicator on the operation panel. Thus, there has been known one configured to notify the abnormality of the brake device (Japanese Patent Laid-Open No. 8-318086-Patent Document 1).

  In addition, when the brake mechanism that brakes the washing dewatering tub is abnormal when the dehydration operation is terminated or interrupted, the brake mechanism is operated by releasing the connection between the rotating tub and the pulsator with a clutch in order to ensure high safety. After a predetermined time has elapsed, the motor and the rotating tank are connected again by connecting the rotating tank and the pulsator, and the motor is driven by the rotating tank and rotated at the same speed, and then the rotation attached to the motor. The rotation speed is detected by the sensor. If the detection speed is low, the rotation tank is immediately disconnected from the pulsator and the brake mechanism is activated. After a predetermined time, the washing machine lid is unlocked, and if the detection speed is high, the speed is increased. There is also known an electric washing machine configured to perform the same processing after waiting for the pressure to fall (Japanese Patent Laid-Open No. 2007-54368-Patent Document 2).

  However, these patent documents describe countermeasures in the case where an abnormality occurs in the rotation sensor that detects the rotation of the rotating tank, and the rotation sensor is not output even though the rotating tank is rotating. Is not described at all.

  In general, an electric washing machine also monitors the soundness of a rotation sensor that detects the rotation of a rotating tub. However, in the case of a conventional electric washing machine, if the rotation sensor does not output a rotation detection signal even though the rotating tub is rotating, it is determined that the rotation sensor is abnormal, and a countermeasure is provided to immediately notify the user of the rotation sensor abnormality. I'm taking it. In the case of such an electric washing machine, since the rotation sensor does not output a rotation detection signal while the rotating tub is rotating, the abnormality determination of the rotation sensor is performed. When the abnormality is reported, there is a high possibility that the rotating tank is rotating at high speed. Therefore, if the user opens the washing lid after hearing the notification of the rotation sensor abnormality, even if the rotation of the rotating tub is suddenly decelerated by the brake device, the rotating tub rotates at a high speed until then. There was a problem that was likely to be in a state.

JP-A-8-318086 JP 2007-54368 A

  The present invention has been made in view of the above-described problems of the prior art, and even when an abnormality occurs in the rotation sensor that detects the rotation of the rotating tub, the abnormality is not immediately notified, but is kept waiting for a certain period of time and rotated. By notifying the rotation sensor abnormality after waiting for a time until the tank rotates sufficiently slowly or until it stops, the rotation tank does not move even if the user opens the washing machine lid immediately in response to the rotation sensor abnormality notification. An object of the present invention is to provide an electric washing machine in which there is no possibility of opening the lid of the washing machine during high-speed rotation.

A feature of the present invention is that a rotation sensor that detects rotation of a rotating tub or pulsator, drive control means that controls rotation of the rotating tub or pulsator, and the drive control means outputs a rotation command of the rotating tub or pulsator. When the rotation detection signal from the rotation sensor is not inputted, it is determined that the rotation sensor is abnormal, and the rotation sensor abnormality monitoring means for turning off the motor power and the rotation sensor abnormality monitoring means output the rotation sensor abnormality determination. when the waits for a predetermined waiting time, provided with a sensor abnormality informing means for informing the rotation sensor malfunction after waiting, and a cover opening and closing sensor sensing the opening and closing of the washing machine lid, the sensor abnormality notification means, the predetermined an electric washing machine for notifying the rotation sensor malfunction immediately when said cover opening and closing sensor while waiting time detects the opening of the washing machine lid That.

  According to the present invention, when the rotation control abnormality monitoring means outputs the rotation sensor abnormality determination while the drive control means outputs the rotation command of the rotation tank or pulsator, the sensor abnormality notification means immediately detects the rotation sensor abnormality. Instead of notifying the rotation tank or pulsator until the rotation speed is sufficiently low or waiting until it stops, the rotation sensor abnormality is notified. Even if the lid is opened, there is no possibility that the washing machine lid can be opened while the rotating tub is rotating at high speed, and safety can be improved.

Sectional drawing of the electric washing machine of the 1st Embodiment of this invention. The block diagram of the control function of the electric washing machine of the said 1st Embodiment. Explanatory drawing of the operation panel of the electric washing machine of the said 1st Embodiment. The flowchart of the abnormality alerting | reporting operation | movement of the rotation sensor by the electric washing machine of the said 1st Embodiment. The washing process table | surface of washing | cleaning, rinse, and dehydration time which changes with the weight of the amount of laundry in the normal washing mode by the electric washing machine of the said 1st Embodiment. The table | surface which shows the standby | waiting time until abnormality notification in stirring operation and dehydration operation | movement at the time of rotation sensor abnormality generation | occurrence | production in the electric washing machine of the said 1st Embodiment. The flowchart of the abnormality alerting | reporting operation | movement of the rotation sensor by the electric washing machine of the 2nd Embodiment of this invention. The table | surface which shows the standby | waiting time until rotation sensor abnormality notification which changes with the weight of the amount of laundry in the electric washing machine of the said 2nd Embodiment. The flowchart of the abnormality alerting | reporting operation | movement of the rotation sensor by the electric washing machine of the 3rd Embodiment of this invention. The table | surface which shows the standby | waiting time until rotation sensor abnormality notification which changes with the length of motor-on continuation time in the electric washing machine of the said 3rd Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
The electric washing machine of the 1st Embodiment of this invention is demonstrated using FIGS. 1-3. First, in FIG. 1 showing a schematic overall configuration of a fully automatic washing machine, an outer tub 2 is disposed in an outer box 1 so as to be swingable via an elastic suspension mechanism 3. A rotating tub 4 serving both as a washing tub and a dewatering tub is rotatably provided in the outer tub 2, and a pulsator 5 for stirring and washing the laundry on the inner bottom of the rotating tub 4 is provided. It is provided so as to be rotatable. The rotating tub 4 has a dewatering hole 4a formed only in the upper part of the peripheral wall portion, and no dewatering hole is formed in the other peripheral wall portions.

  A drainage passage 6 is provided at the inner bottom of the outer tub 2 so as to extend from the center to the rear side. The end of the drainage passage 6 on the center side is configured to communicate with the inside of the rotary tank 4. A rear end portion of the drainage passage 6 is a drainage port 7, and an air trap 8 for detecting a water level is provided in the drainage port 7. The drain port 7 is configured to be opened and closed by, for example, a motor-type drain valve 9. A drain hose 10 is connected to the lower part of the drain valve 9. The pulsator 5 has a large number of water holes.

  In the case of this configuration, when the drain valve 9 is opened, the water in the rotating tub 4 is configured to be discharged to the outside through the drain passage 6 and the drain hose 10. In addition, an overflow port 11 for draining water overflowing from the rotary tank 4 is formed at the front part of the bottom of the outer tank 2. The overflow port 11 communicates with the drain hose 10 through a hose (not shown). In the case of this configuration, when the water in the rotating tub 4 is discharged into the outer tub 2 through the dewatering hole 4a during the dehydration operation, the drainage is discharged to the outside through the overflow port 11 and the drainage hose 10. It is comprised so that. Note that a water level sensor 12 comprising a pressure sensor is connected to the air trap 8 via an air pipe 13, and the water level sensor 12 is configured to detect the water level in the rotating tub 4.

  A balance ring 14 is disposed on the upper part of the rotating tub 4. An inner drum 15 having a substantially drum shape is disposed on the inner peripheral portion of the rotating tub 4. The inner basket 15 is made of a stainless steel plate and has a plurality of water passage holes formed in the peripheral wall portion. Yes. A bottom cover 16 is disposed at the lower part of the inner peripheral portion of the rotating tub 4. A predetermined gap for water flow is provided between the inner basket 15 and the rotating tub 4 and between the bottom cover 16 and the rotating tub 4. In the case of this configuration, the water in the rotating tub 4 flows downward or upward through the predetermined gap for water passage during drainage or dehydration operation.

  On the outer bottom of the outer tub 2, a motor 17 and a drive mechanism 18 for washing and dewatering operations are disposed. The rotational force of the motor 17 is transmitted to the drive mechanism unit 18 via the belt transmission mechanism 19. The drive mechanism 18 has a well-known configuration, and includes a clutch mechanism, a reduction gear, a brake device, and the like. The brake device of the drive mechanism unit 18 is a band brake device having a function of braking and stopping the rotating tub 4, and a brake drum provided on the tank shaft of the rotating tub 4 so as to rotate integrally therewith, The brake band is provided outside the brake drum. Further, the clutch mechanism of the drive mechanism unit 18 has a function of switching between a state in which the rotational force of the motor 7 is transmitted to the pulsator 5 only by being decelerated via the reduction device, and a state in which the rotational force is transmitted to the rotary tank 4 and the pulsator 5. Yes. The brake device and the clutch mechanism are configured to be driven in conjunction with the opening / closing operation of the drain valve 9 by a drive source of the drain valve 9 (configured by a motor, a return spring, etc.).

  Specifically, at the time of washing when the drain valve 9 is closed, the drive mechanism 18 decelerates and transmits the rotational force of the motor 17 only to the pulsator 5 while the brake tub 4 is braked and stopped by the brake device. The pulsator 5 is rotated (stirring control). During drainage and dehydration when the drain valve 9 is opened, the drive mechanism 18 transmits the rotational force of the motor 17 to the rotary tank 4 and the pulsator 5 in a state in which braking of the rotary tank 4 by the brake device is released. Rotate at high speed (dehydration control).

  A top cover 20 is attached to the top of the outer box 1, and an electromagnetic water supply valve 21 is disposed at the rear of the top cover 20. The water supply valve 21 is configured to supply water into the rotating tub 4.

  The top cover 20 is provided with, for example, a foldable lid 22 that can open and close a laundry entrance. A tank cover 23 is attached to the upper part of the outer tank 2, and an inner lid 24 is provided on the tank cover 23 so as to be openable and closable.

  Further, an operation panel 25 as shown in FIG. 3 is disposed on the upper surface of the front portion of the top cover 20. The operation panel 25 is provided with various switch input units and various displays. Specifically, a power-on switch 26 and a power-off switch 27 for turning on the power 54 are provided at the right end portion of the operation panel 25, and a start / pause start switch 28 is provided on the left side thereof. . Further, in the lower half of the operation panel 25, from the left to the right, the powder soap switch 29 for setting the use of the powder soap, the water level switch 30 for setting the water level, the reservation switch 31 for setting the reserved operation, A washing switch 32 for setting the washing operation time, a rinsing switch 33 for setting the number of times of rinsing, a dehydration switch 34 for setting the dehydration operation time, a preference switch 35 for setting the strength of each operation according to preference, and a washing course are set. A course switch 36 is provided.

  Further, in the upper half of the operation panel 25 from the left to the right, a rotation sensor abnormality indicator 37 for displaying that the rotation sensor 47 is abnormal, and a shower monitor 38 for displaying the execution state of the dehydration rinsing operation. , A water level indicator 39 for displaying the set water level, and three numerical indicators 40, 41 comprising, for example, a 7-segment display element for displaying the amount of detergent, the washing operation time, the number of rinsing operations, the dehydration operation time, etc. , 42, a process indicator 43 for displaying the washing process, a course indicator 44 for displaying the set washing course, and the like. In this case, the rotation sensor abnormality indicator 37 constitutes the notification means of the present invention.

  On the other hand, in FIG. 2 showing the electrical configuration in combination of functional blocks, the control circuit 45 is composed of a microcomputer or the like and has a function of controlling the overall washing operation, and stores a control program for it in the EEPROM 51. doing. The control circuit 45 is configured to have each function as a rotation speed detection means, an abnormality detection means, an operation control means, and a laundry amount detection means. The control circuit 45 receives various switch signals from the switch input unit 46 having various switches of the operation panel 25, and input signals from the lid switch 50 that operates when the half-foldable lid 22 is opened. A water level detection signal from the water level sensor 12 and a pulse signal from the rotation sensor 47 that generates a pulse signal according to the rotation of the motor 17 are received. In this case, the control circuit 45 is configured to detect the rotation speed of the motor 17 based on the pulse signal from the rotation sensor 47 and to detect the rotation speed of the rotating tub 4 from the rotation speed of the motor 17 during the dehydration operation. ing.

  Further, the control circuit 45 drives and controls a display unit 48 having various indicators of the operation panel 25, a buzzer 49 for notifying operation end, occurrence of abnormality, the water supply valve 21, the drain valve 9 and the motor 17. . In this case, the control circuit 45 is configured to be capable of variable speed operation control of the motor 17, and can set the rotation speed of the pulsator 5 to a desired speed during stirring control for washing, and a rotating tub during dehydration control. The rotational speed of 4 can be set to a desired speed.

  The control circuit 45 also includes a timer 52 for holding the abnormality notification of the rotation sensor 47 for a predetermined time.

  Next, the operation of the electric washing machine having the above configuration will be described with reference to FIGS. FIG. 4 shows the content of the notification operation control when the rotation sensor abnormality occurs in the control program stored in the EEPROM 51. FIG. 5 is a process chart showing each content of the washing process, the rinsing process, and the dehydrating process depending on the weight of the laundry when the washing course is a standard course, for example. FIG. 6 is a table of standby times until abnormality notification when rotation sensor abnormality is detected during stirring operation and dehydration operation.

  As shown in FIG. 5, in the washing process, first, a weight detection operation (for example, 5 seconds) for detecting the amount of laundry is performed (before water supply), and the detected amount of laundry is increased to a large, medium, or small amount. The washing conditions such as the water level and washing operation time are set accordingly. Then, the water supply operation is performed up to the set water level. Subsequently, the washing operation is executed by rotating the pulsator 5 forward and backward. In this case, first, an operation for detecting the cloth quality of the laundry (for example, 1 minute 30 seconds) is executed, and the strength of the water flow is determined according to the detected cloth quality, and thereafter the determined water flow strength is determined. Perform wash operation. When the washing operation is completed, the process proceeds to the rinsing process.

  In this rinsing process, the drainage and dehydration operation is first executed, and then the shower rinsing operation (the operation of rotating the rotating tub 4 while pouring water and then dewatering) is performed twice. Rinse 2 consisting of And if the said rinse process is completed, it will transfer to a dehydration process succeedingly, draining and the final dehydration operation will be performed, and a washing operation will be complete | finished.

  When stopping the dehydration operation, the motor 17 is disconnected. When performing the dehydration operation, the rotation speed of the rotary tank 4 is set to about 950 rpm at the time of high speed dehydration, about 800 rpm at the time of medium speed dewatering, and about 500 rpm at the time of low speed dewatering.

  Next, the notification operation when the rotation sensor 47 no longer detects the rotation of the rotating tub 4 during the washing and stirring operation or the centrifugal dehydration operation will be described with reference to the flowchart of FIG. 4 and the table of FIG. The control circuit 45 performs drive control on the motor 17 based on the rotation number detection signal of the rotation sensor 47. If the input of the rotation detection signal of the rotation sensor 47 stops during that time, it is determined that the sensor is abnormal (step S1). If it is determined that the sensor is abnormal, the control circuit 45 turns off the motor power by the power-off switch 27 (step S2), and starts the time measurement by the standby time timer 52. As shown in the table of FIG. 6, the standby time timer 52 is set to 1 minute if the stirring operation is being performed, and is set to 5 minutes if the dehydration operation is being performed (step S3).

  If the washing machine lid 22 is not opened during standby, the rotation sensor abnormality is notified by the sound of the buzzer 49 when the standby time has elapsed, and at the same time, the rotation sensor abnormality is displayed on the display unit 48 ( Steps S4, S5 and S6). This abnormality notification is continued for 10 seconds, for example. The notification duration time may be 15 seconds or 30 seconds. In any case, by limiting the notification continuation time, for example, when a rotation sensor abnormality occurs while the user is out, the abnormality notification can be prevented from continuing for a long time.

  The washing machine lid 22 may be opened before the timer 52 counts up after the motor power is turned off due to sensor abnormality detection. In such a case, the rotating tub 4 is still rotating due to inertia. In order to ensure safety, the rotation sensor abnormality is immediately notified by the sound of the buzzer 49, and at the same time, the rotation sensor abnormality is displayed on the display unit 48 to prompt the user to close the lid 22. (Branch to YES in step S4 and shift to step S7). When the washing machine lid 22 is closed again, the timer 52 continues to count (YES in step S8 and proceeds to step S5).

  On the other hand, if the lid 52 is not closed even if it is urged to close the lid 22 to ensure safety in step S7 (branch to NO in step S8), the rotation sensor abnormality is continuously notified for a certain time (step S9). , S10).

  If there is a power interruption during the standby period for notifying the sensor abnormality, the control circuit 45 has a control for notifying the abnormality of the rotation sensor immediately when the power is turned on next time. Can be notified to the user.

  Thus, according to the electric washing machine of the present embodiment, when an abnormality occurs in the rotation sensor 47 and the rotation of the rotating tub 4 cannot be detected, the motor power is turned off and the sensor abnormality is notified after waiting for a certain time. As a result, the rotation sensor abnormality is not notified while the rotating tub 4 is rotating at a high speed, and the rotation sensor abnormality is notified after the rotating tank has sufficiently rotated at a low speed or stopped. Even if the user immediately opens the washing machine lid 22 in response to the notification of the rotation sensor abnormality, the washing machine lid 22 is not opened while the rotating tub 4 is still rotating at high speed. Rotation sensor abnormality can be notified after ensuring.

  In addition, according to the present embodiment, when the washing machine lid 22 is opened during the standby time until the rotation sensor abnormality is detected and the abnormality notification is made, the rotation sensor abnormality is immediately notified. , The washing machine lid 22 can be closed again, and in this respect, safety can be improved.

  Furthermore, according to the present embodiment, as shown in the table of FIG. 6, the length of the standby time until the rotation sensor abnormality notification is made different during the stirring operation and the dehydrating operation, and the optimal standby time for each Since the abnormality notification is made after only waiting, the optimal control operation can be performed without waiting for a time longer than the time until the rotary tank 4 stops especially during the stirring operation.

[Second Embodiment]
The electric washing machine according to the second embodiment of the present invention will be described with reference to the flowchart of FIG. 7 and the table of FIG. The greater the amount of laundry, the longer it takes for the dewatering tub (or pulsator) to stop rotating after the motor power is turned off due to inertial force. Therefore, the second embodiment has a large amount of laundry, a small amount, a small amount, a very small amount of laundry, and agitation as compared with the first embodiment shown in FIGS. 1 to 6. It is characterized in that the control is performed so that the waiting time until the sensor abnormality notification is made longer or shorter according to the 2 × 4 case classification during operation and dehydration operation.

  In the present embodiment, the abnormality notification operation when abnormality occurs in the rotation sensor 47 is as follows. For example, as shown in the table of FIG. 8, if the amount of laundry exceeds 6 kg and the stirring operation is being performed, the timer 52 is set to 2 minutes as a standby time. Further, if the amount of laundry is a small amount of 2 kg to 4 kg and the dehydrating operation is being performed, 5 minutes is set as the waiting time. Similarly, if the amount of laundry is a very small amount of 2 kg or less and the stirring operation is being performed, the waiting time is set to 30 seconds.

  The structure of the washing machine in the present embodiment is as shown in FIG. 1, and the control function is as shown in the block diagram of FIG. The control operation of the control circuit 45 is as shown in the flowchart of FIG.

  The control circuit 45 performs drive control on the motor 17 based on the rotation number detection signal of the rotation sensor 47. If the input of the rotation detection signal of the rotation sensor 47 stops during that time, it is determined that the sensor is abnormal (step S11). If it is determined that the sensor is abnormal, the control circuit 45 turns off the motor power with the power-off switch 27 (step S12), and determines whether the current operation is a stirring operation or a dehydrating operation (step S13). ).

  If the stirring operation is in progress, the amount of laundry is very small (0 kg to 2 kg), small (2 to 4 kg), slightly large (4 to 6 kg), or large (6 kg). (S14 to S16). Then, as shown in the table of FIG. 8, if the amount of laundry is extremely small, the waiting time T is set to 30 seconds, if it is small, T = 1 minute, if it is slightly large, T = 1 minute 30 seconds, If the amount is large, T = 2 minutes are set and the timer 52 starts counting (steps S17 to S20).

  On the other hand, if the determination in step S13 is a dehydration determination, it is subsequently determined whether the amount of laundry is a very small amount, a small amount, a slightly large amount, or a large amount (steps S21 to S23). Similarly, as shown in the table of FIG. 8, T = 4 minutes if the amount of laundry is extremely small, T = 5 minutes if the amount of laundry is small, T = 6 minutes if it is slightly large, and T if it is large. = 7 minutes, and the timer 52 starts counting (steps S24 to S27).

  After starting the time measurement of the standby time, as in the first embodiment, if the washing machine lid 22 is not opened during the standby time, the buzzer 49 sounds the rotation sensor abnormality when the standby time has elapsed. At the same time, the rotation sensor abnormality is displayed on the display unit 48 (steps S28, S29, S30). This abnormality notification is also continued for 10 seconds, for example. Further, the notification continuation time may be 15 seconds or 30 seconds. Also in this case, by limiting the notification continuation time, for example, when a rotation sensor abnormality occurs while the user is out, the abnormality notification is prevented from continuing for a long time.

  The washing machine lid 22 may be opened before the timer 52 counts up after the motor power is turned off due to sensor abnormality detection. In such a case, the rotating tub 4 is still rotating due to inertia. Since there are many cases, the rotation sensor abnormality is immediately notified for ensuring safety, and the user is prompted to close the lid 22 (branch to YES in step S28 and proceed to step S31). When the washing machine lid 22 is closed again, the timer 52 continues to count (YES in step S32 and proceeds to step S29).

  On the other hand, if the lid 52 is not closed even if it is urged to close the lid 22 to ensure safety in step S31 (branch to NO in step S32), the rotation sensor abnormality is continuously notified for a certain time (step S33). , S34).

  Even in the present embodiment, if the power is shut off during the standby time for notifying the sensor abnormality, the control circuit 45 has a control for notifying the abnormality of the rotation sensor immediately when the power is turned on next time. The user can be informed of the failure of the rotation sensor when the power is turned on next time.

  Thus, according to the electric washing machine of the present embodiment, in addition to the same operations and effects as those of the first embodiment, as shown in the table of FIG. In addition to changing the length of the waiting time until the sensor abnormality notification, the waiting time was varied depending on the weight of the laundry, and the abnormality notification was made after waiting for the optimum waiting time for each, so in any operating situation An optimal control operation can be performed without waiting for a time unnecessarily longer than the time until the rotating tub 4 stops.

[Third Embodiment]
The electric washing machine of the 3rd Embodiment of this invention is demonstrated using the flowchart of FIG. 9, and the table | surface of FIG. The third embodiment corresponds to the first embodiment shown in FIG. 1 to FIG. 6 according to the extremely short time, short time, slightly long time, and long time of the motor on time determined by the control circuit 45. And, it is characterized in that the control is performed so that the waiting time until the sensor abnormality notification is made longer or shorter according to the case of 2 × 4 during the agitation operation and the dehydration operation.

  In the present embodiment, the abnormality notification operation when abnormality occurs in the rotation sensor 47 is as follows. For example, as shown in the table of FIG. 10, if the motor-on time is longer than 60 seconds and the stirring operation is being performed, the timer 52 is set to 1 minute as the standby time. If the motor-on time is a short time of 20 to 40 seconds and the dehydrating operation is being performed, 3 minutes is set as the standby time. Similarly, if the motor-on time is a very short time of 0 to 20 seconds and the stirring operation is being performed, the standby time is set to 15 seconds. That is, the waiting time is increased and decreased in a state in which the motor-on time is short and the rotation speed of the rotating tub 4 is still considered low and the motor-on time is long and the rotation speed of the rotating tub 4 is assumed to be in a high-speed state. It is characterized in that sufficient safety is ensured at the time of abnormality notification, and abnormality notification is performed without waiting for an unnecessarily long time.

  The structure of the washing machine in the present embodiment is as shown in FIG. 1, and the control function is as shown in the block diagram of FIG. The control operation of the control circuit 45 is as shown in the flowchart of FIG.

  The control circuit 45 performs drive control on the motor 17 based on the rotation number detection signal of the rotation sensor 47. If the input of the rotation detection signal of the rotation sensor 47 stops during that time, it is determined that the sensor is abnormal (step S41). If it is determined that the sensor is abnormal, the control circuit 45 turns off the motor power by the power switch 27 (step S42), and determines whether the stirring operation or the dehydrating operation is currently performed (step S43). ).

  If the stirring operation is in progress, then, whether the previous motor-on time was an extremely short time (0 second to 20 seconds), a short time (20 seconds to 40 seconds), or a slightly long time (40 seconds to 60 seconds). Second) or a long time (60 seconds or longer) (steps S44 to S46). Then, as shown in the table of FIG. 10, if the motor-on time is extremely short, the standby time T is set to 15 seconds, if it is short, T = 30 seconds, and if it is slightly long, T = 45 seconds. If it is a long time, T = 1 minute is set, and the timer 52 starts counting (steps S47 to S50).

  On the other hand, if it is determined in step S43 that dehydration is being performed, subsequently, it is determined whether the previous motor-on time is an extremely short time, a short time, a slightly long time, or a long time (steps S51 to S51). S53). Similarly, as shown in the table of FIG. 10, T = 2 minutes if the motor-on time is extremely short, T = 3 minutes if the motor is short, T = 4 minutes if it is slightly long, and long time. If so, T = 5 minutes is set, and the timer 52 starts counting (steps S54 to S57).

  After starting the time measurement of the standby time, as in the first embodiment, if the washing machine lid 22 is not opened during the standby time, the buzzer 49 sounds the rotation sensor abnormality when the standby time has elapsed. And at the same time, the rotation sensor abnormality is displayed on the display unit 48 (steps S58, S59, S60). This abnormality notification is also continued for 10 seconds, for example. Further, the notification continuation time may be 15 seconds or 30 seconds. Also in this case, by limiting the notification continuation time, for example, when a rotation sensor abnormality occurs while the user is out, the abnormality notification is prevented from continuing for a long time.

  The washing machine lid 22 may be opened before the timer 52 counts up after the motor power is turned off due to sensor abnormality detection. In such a case, the rotating tub 4 is still rotating due to inertia. Since there are many cases, the rotation sensor abnormality is immediately notified to ensure safety, and the user is prompted to close the lid 22 (branch to YES in step S58 and proceed to step S61). When the washing machine lid 22 is closed again, the timer 52 continues to count (YES in step S62 and proceeds to step S59).

  On the other hand, if the lid 52 is not closed even if it is urged to close the lid 22 for ensuring safety in step S61 (branch to NO in step S62), the rotation sensor abnormality is continuously notified for a certain time (step S63). , S64).

  Even in the present embodiment, if the power is shut off during the standby time for notifying the sensor abnormality, the control circuit 45 has a control for notifying the abnormality of the rotation sensor immediately when the power is turned on next time. The user can be informed of the failure of the rotation sensor when the power is turned on next time.

  Thus, according to the electric washing machine of the present embodiment, in addition to the same operations and effects as those of the first embodiment, as shown in the table of FIG. In addition to varying the length of the standby time until the sensor abnormality notification, the standby time was varied depending on the length of the motor on time immediately before the abnormality occurred, and the abnormality notification was made after waiting for the optimal standby time for each. Even in the above operation state, an optimal control operation can be performed without waiting for a time longer than the time until the rotating tub 4 stops.

DESCRIPTION OF SYMBOLS 4 Rotating tank 5 Pulsator 12 Water level sensor 17 Motor 22 Washing machine lid 26 Power supply relay circuit 27 Power-off switch 45 Control circuit 47 Rotation sensor 48 Display part 49 Buzzer 52 Timer

Claims (5)

A rotation sensor that detects the rotation of the rotating tank or pulsator;
Drive control means for controlling rotation with respect to the rotating tank or pulsator;
When the drive control means is outputting a rotation command of the rotary tank or pulsator, if a rotation detection signal from the rotation sensor is not input, it is determined that the rotation sensor is abnormal, and the rotation sensor abnormality monitoring means is turned off. When,
When the rotation sensor abnormality monitoring unit outputs a rotation sensor abnormality determination, the sensor abnormality notification unit waits for a predetermined standby time and notifies the rotation sensor abnormality after the standby ;
A lid opening / closing sensor for detecting opening and closing of the washing machine lid ;
The electric sensor according to claim 1, wherein the sensor abnormality notification means immediately notifies a rotation sensor abnormality when the lid opening / closing sensor detects the opening of the washing machine lid during the predetermined time . The sensor abnormality notifying means has different lengths of waiting time until the rotation sensor abnormality is notified when the drive control means is controlling the stirring of the rotating tub or pulsator and when it is dewatering controlled. electric washing machine according to claim 1, characterized in that the. A laundry weight detection sensor for detecting the laundry weight is provided.
2. The sensor abnormality notifying unit according to claim 1, wherein the waiting time until the rotation sensor abnormality is notified differs according to the laundry weight detected by the laundry weight detection sensor. 2. The electric washing machine according to 2. An operation time measuring means for measuring the operation time from the start of operation of the rotary tank ;
The said sensor abnormality alerting | reporting means made the said standby | waiting time until it alert | reports the said rotation sensor abnormality according to the driving | operation time which the said operating time timer measures time differed in length. An electric washing machine according to any one of the above. Before Symbol sensor abnormality notification means, if there is power-off of the electric washing machine during the waiting time, to any one of the preceding claims, characterized in that for informing the rotation sensor abnormality at the next power-on The electric washing machine as described.

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