KR101253404B1 - Washing machine - Google Patents

Abstract

The drum 11, the tank 13 containing the drum, the motor 12 for rotationally driving the drum, the housing 10 for accommodating the tank, and the plurality of minimum acceleration resolutions provided in the tank 13 are different. And a control unit 20 for controlling the motor and the vibration detecting device based on the output of the vibration detecting device 17 and the vibration detecting device 17 composed of an acceleration sensor capable of switching the acceleration detecting range. The vibration detection is performed in a more accurate state by switching the range in accordance with the detected acceleration or drum rotation speed.

Description

Washing machine {WASHING MACHINE}

The present invention relates to a washing machine equipped with a vibration detecting device for detecting vibration of a water tank.

In order to realize low vibration and low noise operation of a washing machine, vibration detection with good precision is essential, and various vibration detection means have been devised in the past.

In particular, in order to improve vibration detection accuracy, a vibration detection device equipped with an acceleration sensor has been devised.

For example, the vibration detection method of the washing machine of patent document 1 dehydrates rotation of the amplification factor of the output of the acceleration sensor which responded to the vibration of the direction orthogonal to the direction of the dehydration tank rotation axis at the low speed of a dehydration rotation speed. The number is larger than the amplification factor of the output �� in response to the vibration in the dehydration tank rotating shaft direction at a predetermined or higher high speed, and it is intended to effectively detect the vibration in the dehydration device having different vibration modes depending on the rotation speed.

However, in the conventional configuration, an apparatus (signal processing apparatus) for amplifying the output of the vibration detecting mechanism is required for each amplifying process, and the vibration detecting mechanism becomes complicated. In addition, by amplifying the output of the vibration detection mechanism, the noise included in the output component is amplified, and there is a need to take a countermeasure against noise.

Japanese Unexamined Patent Publication No. 2005-274443

MEANS TO SOLVE THE PROBLEM This invention solves the conventional subject, and provides the vibration detection apparatus with a high precision at low cost by accurately switching the acceleration detection range from which sensitivity differs respectively according to the detected acceleration and drum rotation speed.

MEANS TO SOLVE THE PROBLEM In order to solve the conventional subject, this invention detects the drum provided with the water flow hole, the tank containing a drum, the motor which rotates a drum, the housing which accommodates a tank, and the vibration of a tank. And a vibration detection device including an acceleration sensor capable of switching a plurality of acceleration detection ranges having different minimum acceleration resolutions, and a control unit for controlling the motor and the vibration detection device based on the output of the vibration detection device. The accuracy of the vibration detection is improved by switching the acceleration detection range in accordance with the acceleration.

The washing machine of the present invention can perform vibration detection in the detection range with the highest sensitivity by switching the acceleration detection range in accordance with the detected acceleration or drum rotation speed. In addition, it is possible to realize a low vibration and a low noise operation by improving the accuracy of vibration detection, and a shortening of the operation time due to a good operation, thereby realizing both product safety and user convenience.

1 is a block diagram of a washing machine control device according to the first embodiment;
2A is a configuration diagram showing a mounting position of a three-axis acceleration sensor as the vibration detection device according to the first embodiment;
2B is a configuration diagram showing a mounting position of a three-axis acceleration sensor as a vibration detection device in Embodiment 1;
3A is a graph showing a change in acceleration in a dewatering step of a drum type washing machine;
3B is a graph showing a change in acceleration in the dewatering step of the drum type washing machine;
3C is a graph showing a change in acceleration in a dewatering process of a drum type washing machine;
4 is a flowchart showing a series of processes for performing the switching of the acceleration detection range of the acceleration sensor according to the first embodiment;
FIG. 5 is a time chart showing a series of processes for switching the acceleration detection range of an acceleration sensor capable of detecting vibration in multiple directions in a dehydration step; FIG.
6 is a block diagram of a washing machine control device according to the second embodiment;
7 is a flowchart showing a series of processes for performing the switching of the acceleration detection range of the acceleration sensor in the second embodiment;
8A is a time chart showing a series of processes for switching the acceleration detection range of an acceleration sensor capable of detecting vibrations in multiple directions in a dehydration step;
8B is a time chart showing a series of processes for switching the acceleration detection range of the acceleration sensor capable of detecting vibrations in multiple directions in the dehydration step;
8C is a time chart showing a series of processes for switching the acceleration detection range of an acceleration sensor capable of detecting vibrations in multiple directions in a dehydration step;
8D is a time chart showing a series of processes for switching the acceleration detection range of the acceleration sensor capable of detecting vibrations in multiple directions in the dehydration step;
Fig. 9 is a flowchart showing a series of processes for switching the acceleration detection range of the acceleration sensor in the dehydration step and performing the dehydration continuation judgment.
FIG. 10 is a flowchart showing a series of processes for switching the acceleration detection range of the acceleration sensor in the washing process of the drum type washing machine according to the third embodiment. FIG.

(Embodiment 1)

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the control apparatus which detects and suppresses the vibration by the unbalance of the laundry of the washing machine (drum type) in Embodiment 1. FIG. In FIG. 1, the washing machine of Embodiment 1 is provided with the housing 10, the drum 11 which accommodates and rotates laundry, and the motor 12 which rotates, while controlling the speed of the drum 11. FIG. In addition, the seal packing for removing the gap between the water tank 13, the cover 18 having the laundry inlet, the water tank 13 and the cover 18 having the laundry inlet, in which the drum 11 is introduced, 14), a support spring 15 for holding the posture of the water tank 13, and a vibration damper for reducing the vibration generated when the motor rotates to reduce vibration transmission to the housing 10 or the floor 16 ).

The washing machine of Embodiment 1 is further provided with the vibration detection apparatus 17 which detects the vibration of the water tank 13. As an example of the vibration detection device 17, in Embodiment 1, although the acceleration sensor which can digitally output the change of acceleration is used, even if the acceleration sensor of the analog output system which can output the change of acceleration as a voltage change is used, good.

The acceleration sensor in Embodiment 1 uses the capacitive acceleration sensor which converts the change of capacitance into a voltage. In addition, piezo-resistive acceleration sensors or the like may be used. These so-called MEMS (Micro Electro Mechanical Systems) sensors are microscopic sensors manufactured using semiconductor integrated circuit fabrication technology, and have been recently mass-produced at low cost. As an advantage of the MEMS type sensor, it is small and light, and has little influence on vibration itself, and thus can be said to be suitable as the vibration detecting device 17. In addition, the acceleration sensor in Embodiment 1 employ | adopts the thing which can detect three axes with one chip, and detects the vibration of multiple directions. Therefore, it is possible to accurately take the vibration mode that is complicated by the increase in the rotational speed at the time of dehydration and to determine various unbalanced states. However, the acceleration sensor may be two axes.

The mounting position of the vibration detection apparatus 17 in Embodiment 1 is made into the upper front side of the water tank 13. Since the vibration when accelerated to high speed rotation in the state where the unbalance of the laundry in the drum 11 exists in the front part is larger than the case where the unbalance is present in the rear part, the high speed rotation in the state where there is a large unbalance in the front part It is necessary to avoid the acceleration as much as possible. When there is an unbalance in the front part, since the front part side of the water tank 13 is also easy to appear remarkably, it is preferable to make the mounting position of the vibration detection apparatus 17 also into a front part.

The dustproof rubber 19 has attached the housing 10 to the floor. The support spring 15 and the vibration damper 16 constitute a support means. Moreover, the control part 20 which controls the rotation and the vibration detection apparatus 17 of the motor 12 is provided.

2A and 2B are diagrams showing the mounting positions of the three-axis acceleration sensor that is the vibration detection device 17. Among the detection axes of the 3-axis accelerometer, the X axis is mounted horizontally in the horizontal direction when viewed from the front of the main body, the Y axis is mounted in the front and rear (rotation axis) direction, and the Z axis is mounted in the vertical direction, and the movement of the water tank 13 is three-dimensional. Monitoring is possible.

The vibration detection apparatus 17 is attached to the upper part from the main body front side which is the furthest position from the vibration damper 16. This makes it possible to detect vibrations with good sensitivity even in the case of large displacement fluctuations at the time of low speed dewatering rotation.

Table 1 is a table which shows the main specification of the acceleration sensor in Embodiment 1. FIG.

Output type Index finger Acceleration detection range Sensitivity SPI X, Y, Z ± 2g 1024LSb / g ± 6g 340LSb / g

SPI: Serial Peripheral Interface

The output type is a digital serial peripheral interface (digital SPI), which is a multi-axis detection sensor capable of detecting accelerations of three orthogonal axes (X, Y, and Z). Two types of acceleration detection ranges, the first detection range (-2g to + 2g) and the second detection range (-6g to + 6g), can be set, and the detection range can be switched according to the internal register setting of the sensor. . In addition, the sensitivity of each detection range was about 1024 [LSb / g] for the first detection range, about 340 [LSb / g] for the second detection range, and the first detection range was more sensitive than the second detection range. The acceleration detection range is narrowed.

In other words, when the first detection range is set, the unbalance of the drum 11 can be accurately measured by narrowing the acceleration detection range and setting the sensitivity to be large. Therefore, detailed control can be performed. In contrast, when the second detection range is set, the acceleration can be detected in a wide range by lowering the sensitivity and setting the acceleration detection range wide, so that even when abnormal vibration or the like occurs, it can be appropriately coped with.

Moreover, the acceleration sensor which can switch 3 or more acceleration detection ranges (for example, ± 2g, ± 6g, ± 8g) may be sufficient, and it is suitable for specifications, such as the vibration tolerance of a washing machine and the maximum drum rotation speed of a dehydration process. Therefore, it is desirable to select an optimal sensor.

Since the output from the acceleration sensor is digital, in addition to being easier to receive directly into a microcontroller than the analog type, it is strong against noise generated from an inverter circuit or the like which drives the motor 12, Cost increase factors, such as the need for a noise canceling device, can be suppressed.

3A, 3B, and 3C are examples of the acceleration sensor output in the dewatering process of the drum type washing machine, and are graphs in which the detected acceleration is recorded together with the drum rotation speed.

When dehydration is started, acceleration rises with the increase of drum rotation speed, and it turns out that an amplitude level differs for every detection axis. In addition, while X-axis and Y-axis exceed +/- 2g which is a 1st detection range in the vicinity of 900 rpm, it turns out that it has already exceeded about 600 rpm of low speed in Z-axis. This is the type in which the acceleration sensor in Embodiment 1 can detect gravity acceleration in addition to dynamic acceleration, and the margin to + 2g is due to the influence that gravity acceleration (≒ + 1g) is always applied to the Z axis. Is less than the other two axes. The amplitude (Peak-to-Peak value) itself is on the same level as the other two axes, but it is necessary to widen the detection range at an early timing.

In this way, it is understood that, on the occasion of switching of the detection range, it is necessary to switch appropriately while always observing the variation state of the acceleration different for each axis.

FIG. 4 is a flowchart showing the process of switching the acceleration detection range in the dehydration step in Embodiment 1, and is intended to switch the acceleration detection range in accordance with the detected acceleration. Hereinafter, each step will be described sequentially.

First, after the dehydration process starts, the acceleration detection range is set to the first acceleration detection range ± 2 g by the control unit 20 (e.g., microcontroller) (step 1). At the low speed immediately after the start of the dehydration step, since the fluctuation of the water tank 13 is minute, it is preferable to detect the acceleration at a high sensitivity setting.

Next, the drum 11 starts to rotate (step 2). Thereafter, the acceleration is constantly monitored to determine whether the detected acceleration exceeds the first acceleration detection range (step 3). In step 3, if the detected acceleration is within the first acceleration detection range, the rotation is continued without changing the detection range, and it is determined whether or not the dehydration setting time has elapsed (step 4). If it is determined in step 3 that the first acceleration detection range has been exceeded, the rotation is continued after switching to the second acceleration detection range ± 6 g) (step 5). Thereafter, it is determined whether the dehydration setting time has elapsed (step 6). If it is determined in step 6 that the dehydration elapsed time has not elapsed, the rotation is continued and the flow returns to step 6. In step 6, when it is determined that the dehydration elapsed time has elapsed, the rotation of the drum 11 is terminated (step 7). If it is determined in step 4 that the dehydration setting time has not elapsed, the process returns to step 3. In step 4, when it is determined that the dehydration setting time has elapsed, the rotation of the drum 11 is terminated (step 7).

FIG. 5 is a time chart illustrating a switching process of an acceleration detection range in a dehydration step when an acceleration sensor capable of detecting vibration in multiple directions is mounted. FIG. In FIG. 5, although the example of the process which switches the acceleration detection range of each axis individually is shown, the process which changes uniformly may be sufficient.

As can be seen from the graph of acceleration, the acceleration amplitudes of the X-axis and the Z-axis are almost equal, indicating that the Y-axis is a relatively small vibration with respect to the other two axes. Since the Z-axis includes gravity acceleration in the vertical direction, it can be seen that the output of 1g is already displayed at the start of dehydration, and the timing of reaching 2g is also faster than the X-axis. On the other hand, Y axis | shaft is the acceleration which falls within +/- 2g through a dehydration process, and can detect as it is in the state of the acceleration detection range 1 of an initial setting. In addition, since the vibrations of which amplitude differs in accordance with the detection direction are randomly changed at every operation according to the biased state of the laundry stuck in the drum 11, the vibration may be different from the acceleration waveform of FIG. However, as shown in Embodiment 1, by switching the acceleration detection range for each direction in accordance with the change in acceleration, the vibration can be detected at a setting with good sensitivity at all times.

(Embodiment 2)

EMBODIMENT OF THE INVENTION Hereinafter, Embodiment 2 is demonstrated, referring drawings. The present invention is not limited to the embodiments.

6 is a block diagram of a control device that detects and suppresses vibration caused by unbalance of laundry of a washing machine (drum type) according to the second embodiment. In the structure of FIG. 6, the rotation speed detection apparatus 21 which detects the rotation speed of the drum 11 is provided, and switching of an acceleration detection range can be performed according to the detected rotation speed.

FIG. 7 is a flowchart showing the process of switching the acceleration detection range in the dehydration step in Embodiment 2, in which the acceleration detection range is switched in accordance with the rotational speed of the drum 11. Hereinafter, each step will be described sequentially.

After the start of the dehydration process, the control unit 20 sets the acceleration detection range to the first acceleration detection range (± 2 g) (step 1).

Next, the drum 11 starts to rotate (step 2). Thereafter, the rotation speed is increased to determine whether the acceleration detection range switching rotation speed (set to 330 rpm in the second embodiment) has been reached (step 3). In the meantime, acceleration is constantly monitored and rotation is stopped when it detects abnormal acceleration or more that leads to abnormal vibration. In step 3, when it is determined that the rotation speed of the drum 11 has not reached the predetermined rotation speed, the increase in the rotation speed is continued and the flow returns to step 3. In step 3, when it is determined that the rotation speed of the drum 11 reaches a predetermined rotation speed, the acceleration detection range is switched to the second acceleration detection range while the rotation of the drum 11 is kept constant. When switching to the second acceleration detection range is completed, acceleration of rotation of the drum 11 is started again (step 4). Thereafter, it is determined whether the dehydration setting time has elapsed (step 5). If it is determined in step 5 that the dehydration elapsed time has not elapsed, the rotation is continued and the flow returns to step 5. In step 5, when it is determined that the dehydration time has elapsed, the rotation of the drum 11 is terminated (step 6).

In addition, the switching speed of the acceleration detection range may be a speed that avoids the resonance region (120 rpm to 300 rpm) in which the acceleration fluctuations are severe. The acceleration detection range is switched while rotating the drum 11 at a constant speed. As a result, the detection range can be prevented from falling out due to the rapid acceleration rise in the resonance region, thereby preventing the detection from falling out.

8A, 8B, 8C, and 8D are time charts showing the switching processing of the acceleration detection range in the dehydration step when an acceleration sensor capable of detecting vibrations in multiple directions is mounted. In this process, it is a case where the acceleration detection range of each axis is switched uniformly, and it is also possible to switch individually.

At the start of dehydration, the drum rotational speed is increased after setting to the first acceleration detection range, the constant speed is maintained at 330 rpm after passing through the resonance region, and the switch is switched to the second acceleration detection range after a predetermined time has elapsed. Since the amplitude of the resonance region in the second embodiment has a margin with respect to the first acceleration detection range (± 2 g), it may be switched after the resonance region passes.

Fig. 9 is a flowchart showing the process of switching the acceleration detection range in the dehydration step. The acceleration detection range is switched in accordance with the rotational speed of the drum 11 to determine whether dehydration is continued. Hereinafter, each step will be described sequentially.

After the start of the dehydration process, the control unit 20 sets the acceleration detection range to the first acceleration detection range (± 2 g) with the finest detection resolution (step a).

Next, the drum 11 starts to rotate (step b). Next, an unwinding step is performed to eliminate entanglement and bias of the garment (step c). Thereafter, acceleration of rotation of the drum 11 is started (step d).

Next, it is determined whether the detection acceleration exceeds the threshold value 1 during the acceleration (step e). Here, in the relationship between acceleration and vibration, a threshold value shows the vibration when the vibration of the water tank 13 becomes more than a specific vibration, and converts it into acceleration, and the threshold value 1 is an abnormal vibration in a 1st detection range. This is the value used to detect.

In step e, when it is determined that the detection acceleration does not exceed the threshold value 1, it is determined whether the acceleration detection range switching rotation speed has been reached (step i). If it is determined in step i that the acceleration detection range switching speed has not been reached, the process returns to step e. In step i, when it is determined that the acceleration detection range switching speed has been reached, the acceleration detection range is set to the second detection range (± 6 g) in which the detection range is wider than the first acceleration detection range (the detection resolution is rough). (Step j). Next, it is determined whether the detection acceleration exceeds the threshold 2 (step k). Here, the threshold value 2 is a value serving as a reference for detecting abnormal vibration in the second detection range. In step k, when it is determined that the detection acceleration does not exceed the threshold value 2, it is determined whether or not the dehydration setting time has elapsed (step l). In step 1, when it is determined that the dehydration setting time has not elapsed, the process returns to step k. If it is determined in step 1 that the dehydration setting time has elapsed, the rotation of the drum 11 is terminated, the dehydration is terminated, and the flow advances to the next step (step m). In step e, when it is determined that the detection acceleration has exceeded the threshold value 1, and in step k, when it is determined that the detection acceleration has exceeded the threshold value 2, it is regarded as an abnormal vibration state, and the drum 11 The rotation is decelerated and stopped (step f). Next, it is determined whether the stop as the detection acceleration exceeds the threshold has reached a predetermined number of times (step g). In step g, when it is determined that the number of rotation stops of the drum 11 according to the vibration level is not reaching the predetermined number of times, the flow returns to step a to start the dehydration again. If it is determined that the number of rotation stops of the drum 11 according to the vibration level is reaching a predetermined number of times, it is assumed that the unbalanced state is not eliminated even if the dehydration starts to continue anymore, and an error notification is issued to the user. (Step h).

As described above, the detection resolution of the acceleration sensor is made fine in the low speed rotation region in the dehydration step, so that the vibration detection can be accurately performed even at a small vibration level, and the acceleration detection range is narrowly set when the drum 11 is below the predetermined rotation speed. . In addition, the acceleration detection range can be wider than the predetermined rotation speed or more to correspond to the acceleration level which increases as the rotation of the drum 11 becomes high speed. By doing so, it becomes possible to efficiently avoid abnormal vibration in response to the vibration level that fluctuates greatly with the increase of the drum rotation speed.

In addition, when the rotation speed of the drum 11 detects the acceleration detected by the vibration detecting device 17 at the resonance region 120 rpm to 300 rpm or less, the drum rotation may be decelerated at a time when the acceleration of the drum 11 exceeds the predetermined acceleration, and the acceleration below the resonance region may be reduced. In a small region, when the acceleration of the water tank 13 is detected, and the vibration level is large, abnormal vibration can be prevented in advance by decelerating or stopping the rotation of the drum 11, thereby operating efficiency of the dehydration process. Improvement and low vibration dewatering can be realized.

(Embodiment 3)

Hereinafter, Embodiment 3 will be described with reference to the drawings. The present invention is not limited to the embodiments.

Moreover, this invention is applicable also to the washing process of a drum type washing machine.

It is a flowchart which shows the switching process of the acceleration detection range in the washing process of a drum type washing machine. The washing process of the drum type washing machine is a tumbling method in which the laundry is lifted upward by a baffle attached to the inner side of the drum 11 and the contamination is dropped by dropping the lifted laundry. Therefore, the greater the impact (acceleration) at the time of falling, the higher the degree of cleaning. Therefore, it is possible to control the rotation speed of the motor 12 in accordance with the acceleration to increase the degree of cleaning. However, the acceleration of the water tank 13 due to the drop impact of the clothing during the washing process is very small compared to the acceleration of the dewatering process (particularly during the high-speed rotation). Therefore, when controlling the washing operation in accordance with the acceleration, it is necessary to increase the sensitivity.

In the washing process of the drum type washing machine, the mainstream is a sequence in which the drum 11 is repeatedly operated for a predetermined time and a predetermined on-off time limit. If the drum 11 is continuously rotated in the same direction, the clothes may be entangled with each other, causing uneven washing and lowering of the cleaning power. However, by inverting regularly, the entanglement between the clothes can be prevented. Therefore, the entanglement of clothing is also eliminated at each inversion, and the dropping shock (that is, vibration of the water tank 13) also changes. It is desirable to detect vibration at the most sensitive acceleration setting in accordance with this fluctuating vibration (acceleration). Hereinafter, each step will be described sequentially.

After the washing process starts, the control unit 20 sets the acceleration detection range to the first acceleration detection range (± 2 g) (step 1). Next, the drum 11 starts to rotate (step 2). Thereafter, tumbling is performed while constantly monitoring the acceleration.

During tumbling, it is always determined whether the detection acceleration exceeds the first detection range (step 3). In step 3, when it is determined that the detection acceleration exceeds the first detection range, the rotation is continued after switching the acceleration detection range to the second acceleration detection range (step 5). Next, it is determined whether the rotation on time has elapsed for a predetermined time (step 6). In step 6, when it is determined that the rotation on time has not elapsed for a predetermined time, the process returns to step 6. In step 6, when it is determined that the rotation on time has elapsed for a predetermined time, the rotation of the drum 11 is stopped (step 7). Next, it is determined whether the washing set time has elapsed (step 8). In step 8, when it is determined that the set washing time has elapsed, the drum rotation is terminated and the process proceeds to the next step. If it is determined in step 8 that the set washing time has not elapsed, it is determined whether or not the predetermined rotation off time has elapsed (step 9).

In step 9, when it is determined that the predetermined rotation off time has not passed, the process returns to step 9. In step 9, when it is determined that the predetermined rotation off time has elapsed, drum rotation reversal is performed (step 10). Then, the process returns to step 1. In addition, in step 3, when it is determined that the detection acceleration does not exceed the first detection range, the rotation is continued without switching the detection range, and it is determined whether the predetermined rotation on time has elapsed (step 4). . In step 4, when it is determined that the predetermined rotation on time has not passed, the process returns to step 3. If it is determined that the predetermined rotation on time has elapsed, the rotation of the drum 11 is stopped (step 7).

As described above, the operation process (washing, dehydration, etc.) of the washing machine, the drum rotation speed, or the structure of the body (characteristics and layout of the vibration damper 16 and the support spring 15, the size and inclination of the drum 11). Since the detected acceleration varies widely depending on the angle, the installation location of the vibration detecting device 17, and the like, it is important to switch to the optimum acceleration detection range, respectively. Therefore, by switching the acceleration detection range in accordance with the detection acceleration and the drum rotation speed, it is possible to realize a highly accurate vibration detection.

In addition, as in the first embodiment, by increasing the rotational speed of the drum 11, not only the acceleration detected by the vibration detecting device 17 increases, but also unbalance occurs depending on the state of the laundry. Even when the acceleration detected by the vibration detecting device 17 is reduced by lowering the rotation speed, the acceleration detection range in the stable direction is narrowed at a time when the acceleration in any direction is within the predetermined acceleration detection range, thereby improving the accuracy. High vibration detection can be realized.

In addition, when the acceleration in all directions is in the predetermined acceleration detection range, by narrowing the acceleration detection range in all directions, it is possible to simplify the switching of the acceleration detection range while improving the accuracy of the vibration detection.

When the drum 11 is rotated up, the rotation speed of the drum 11 is controlled while monitoring that the detection acceleration of the vibration detecting device 17 does not exceed the maximum acceleration detection range (± 6 g in the third embodiment). In addition, it is possible to prevent abnormal vibration and to realize high speed rotation as much as possible, and to realize low vibration and improved dewatering performance.

By the above, the drum which provided the water flow hole in the outer periphery, the tank which contains a drum and stores wash water, the motor which drives a drum rotationally, the housing which accommodates a tank, and the rotation speed detection which detects the rotation speed of a drum A vibration detection device comprising an apparatus, an acceleration sensor capable of detecting vibrations of the tank and switching a plurality of acceleration detection ranges having different minimum acceleration resolutions, and controlling the motor and the vibration detection device based on the output of the vibration detection device. The control unit includes a control unit that switches the acceleration detection range in accordance with the rotational speed of the drum to set the acceleration detection range appropriately in accordance with the vibration level (acceleration) of the water tank that varies in accordance with the rotational speed, thereby detecting the highest sensitivity. It becomes possible to use a range, and can realize the precision improvement of a vibration detection.

In addition, a drum provided with a water hole in the outer periphery, a water tank containing the drum and storing the wash water, a motor for rotating the drum, a housing accommodating the water tank, and a vibration of the water tank are detected and the minimum acceleration resolution is different. And a control unit configured to control the motor and the vibration detection unit based on the output of the vibration detection device, the vibration detection device including an acceleration sensor capable of switching a plurality of acceleration detection ranges, and the control unit according to the detected acceleration. By switching, it is possible to use the detection range with the highest sensitivity, thereby realizing an improvement in the accuracy of the vibration detection.

As a result, in particular, vibration and noise in the dehydration step can be reduced, so that the operation time can be shortened due to low vibration, low noise operation, and good efficiency operation.

In addition, when the vibration detection device detects an acceleration equal to or greater than a predetermined size, the control unit widens and fixes the acceleration detection range of the vibration detection device so that the peak value of acceleration does not exceed the acceleration detection range of the acceleration sensor. It is possible to control at a high setting, and the improvement of the accuracy of the vibration detection can be realized.

In addition, by controlling the acceleration detection range of the vibration detection device before and / or after the dehydration resonance region, the controller switches the acceleration detection range to avoid the resonance region having a large variation in acceleration in the dehydration process, thereby dehydrating the dehydration region. It is possible to detect stable acceleration in the resonance region.

Further, the control unit is configured to widen the acceleration detection range in the direction exceeding the acceleration detection range when the detection acceleration in any one direction of the vibration detection device capable of detecting the vibration in the plural directions exceeds the acceleration detection range. Thus, by detecting the acceleration detection range individually for each vibration detection direction, vibration detection can be performed with an optimum sensitivity for each vibration detection direction.

Further, the control unit expands the acceleration detection range in all directions when the detection acceleration in any one direction of the vibration detection device capable of detecting vibrations in multiple directions exceeds the acceleration detection range. Acceleration detection range switching processing can be simplified.

Further, the control unit narrows the acceleration detection range in the direction within the acceleration detection range when the detection acceleration in any one direction of the vibration detection device capable of detecting the vibration in the plural directions falls within the predetermined acceleration detection range. By doing so, it is possible to select the acceleration detection range having the highest sensitivity in accordance with the vibration level, thereby improving the accuracy of the vibration detection.

Further, the control unit narrows the acceleration detection range in all directions at the time when the detection acceleration in all directions of the vibration detection device capable of detecting the vibration in the plural directions falls within the predetermined acceleration detection range, thereby reducing the vibration level. Therefore, it is possible to select an acceleration detection range with high sensitivity, and not only to improve the accuracy of vibration detection, but also to simplify the acceleration detection range switching processing by the control unit.

In addition, the control unit can switch the acceleration detection range of the vibration detection device in a state where the drum rotation speed is constant, so that the vibration detection can be executed accurately in the rotation region with a large amount of acceleration variation when the drum rotation speed increases or decreases. have.

Moreover, the control part can narrowly detect the acceleration detection range of the vibration detection apparatus at the time of a drum rotation start, and can always perform the vibration detection at the time of the dehydration start with small acceleration with a high sensitivity setting.

In addition, the controller controls the rotational speed of the drum so that the detection acceleration of the vibration detecting device does not exceed the maximum acceleration detection range when the drum rotational speed rises. Dewatering becomes possible, and both low vibration and dewatering performance can be achieved.

In addition, since the acceleration sensor can switch the acceleration detection range only by switching the set value of the internal register, a switch for separately switching the acceleration detection range is unnecessary, and the vibration detection device can be simplified.

In addition, since the acceleration sensor is a digital output system, it is particularly difficult to be affected by noise generated from a motor or the like mounted on a washing machine, and thus, vibration detection with high accuracy can be performed and the control unit can be compared with an analog system. Since wiring can be reduced, system simplification can be easily realized.

In addition, the control unit sets the acceleration detection range of the vibration detection device to be narrower than the case where the predetermined drum rotation speed is lower than the predetermined drum rotation speed, and the drum at the time when the detected acceleration exceeds the predetermined acceleration By decelerating the rotation of the tank, when the acceleration level of the tank at the low speed rotation is minute, the acceleration can be detected with high precision at a finer setting, and the acceleration detection range is widened at the high speed rotation. Even in the case where the acceleration level of the tank is large, the maximum vibration value is reliably detected, and in the case of vibration such that the acceleration detected in each setting exceeds a predetermined threshold, the drum rotation is decelerated. By stopping or stopping, it can prevent that a vibration increases beforehand. As a result, in particular, vibration and noise in the dehydration step can be reduced, so that the operation time can be shortened due to low vibration, low noise operation, and good efficiency operation.

In addition, the controller constantly monitors the acceleration of the water tank that changes with the increase in the drum speed by decelerating the drum rotation when the acceleration detected by the vibration detecting device exceeds the predetermined acceleration when the drum speed is rising. At the same time, when the vibration level is large, the drum rotation can be slowed down or stopped to prevent the vibration from increasing in advance, and in particular, the vibration and noise in the dehydration step can be reduced, so that the vibration is low. The operation time can be shortened due to the low noise operation and the efficient operation.

Further, the controller detects the acceleration of the tank in the region where the acceleration below the resonance rotation speed is minute by decelerating the drum rotation when the acceleration detected by the vibration detecting device below the resonance region exceeds the predetermined acceleration. In the case where the vibration level is large, abnormal vibration can be prevented in advance by decelerating or stopping the drum rotation, thereby realizing an improvement in operating efficiency and low vibration dewatering in the dehydration step.

(Industrial availability)

As described above, the washing machine according to the present invention can use the most sensitive acceleration detection range according to the detected acceleration and the number of rotations of the drum, thereby improving the vibration detection accuracy and accurately suppressing vibration during dehydration and washing. useful.

10 housing 11 drum
12: motor 13: water tank
14 seal packing 15 support spring
16: dustproof damper 17: vibration detection device
18: cover 19: dustproof rubber
20:

Claims (16)

A drum provided with a water passage hole, a water tank containing the drum, a motor for rotationally driving the drum, a housing accommodating the water tank, a rotation speed detection device for detecting the rotation speed of the drum, and a vibration of the water tank. And a control unit for controlling the motor and the vibration detection device based on an output of the vibration detection device, the vibration detection device including an acceleration sensor capable of switching a plurality of acceleration detection ranges having different minimum acceleration resolutions at the same time. ,
The control unit switches the acceleration detection range of the vibration detection device before and / or after the dehydration resonance region according to the rotation speed of the drum.
washer. A drum provided with a water passage hole, a water tank containing the drum, a motor for rotationally driving the drum, a housing accommodating the water tank, a rotation speed detection device for detecting the rotation speed of the drum, and a vibration of the water tank. And a control unit for controlling the motor and the vibration detection device based on an output of the vibration detection device, the vibration detection device including an acceleration sensor capable of switching a plurality of acceleration detection ranges having different minimum acceleration resolutions at the same time. ,
The control unit switches the acceleration detection range of the vibration detection device according to the rotation speed of the drum while the rotation speed of the drum is constant.
washer. 3. The method according to claim 1 or 2,
The control unit, when the vibration detecting device detects an acceleration of a predetermined magnitude or more, widens and fixes the acceleration detection range of the vibration detecting device.
washer. delete 3. The method according to claim 1 or 2,
The controller controls the acceleration detection range in the direction exceeding the acceleration detection range when the detection acceleration in any one direction of the vibration detection device capable of detecting vibration in a plurality of directions exceeds a predetermined acceleration detection range. Characterized by widening
washer. 3. The method according to claim 1 or 2,
The said control part widens the acceleration detection range of all directions when the detection acceleration of any one direction of the said vibration detection apparatus which can detect the vibration of multiple directions exceeded the predetermined acceleration detection range, It is characterized by the above-mentioned.
washer. 3. The method according to claim 1 or 2,
The controller controls the acceleration detection range in the direction within the acceleration detection range at the time when the detection acceleration in any one direction of the vibration detection device capable of detecting the vibration in the plural directions falls within a predetermined acceleration detection range. Characterized by narrowing
washer. 3. The method according to claim 1 or 2,
The control unit narrows the acceleration detection range in all directions when the detection acceleration in all directions of the vibration detection device capable of detecting vibrations in multiple directions falls within a predetermined acceleration detection range.
washer. delete 3. The method according to claim 1 or 2,
The control unit narrows the acceleration detection range of the vibration detection device to the narrowest at the start of drum rotation.
washer. 3. The method according to claim 1 or 2,
The control unit controls the rotation speed of the drum so that the detection acceleration of the vibration detecting device does not exceed the maximum acceleration detection range when the drum rotation speed increases.
washer. 3. The method according to claim 1 or 2,
The acceleration sensor is capable of switching the acceleration detection range only by switching the set value of the internal register.
washer. 3. The method according to claim 1 or 2,
The acceleration sensor is a digital output system, characterized in that
washer. 3. The method according to claim 1 or 2,
The control unit sets the acceleration detection range of the vibration detecting device to be narrower than the case where the predetermined drum rotation speed is lower than the predetermined drum rotation speed, and when the detected acceleration exceeds the predetermined acceleration, Characterized by slowing the rotation of the drum
washer. 3. The method according to claim 1 or 2,
The control unit decelerates drum rotation when the acceleration detected by the vibration detecting device exceeds a predetermined acceleration when the drum rotation speed rises in full swing.
washer. 3. The method according to claim 1 or 2,
The control unit decelerates drum rotation when the acceleration detected by the vibration detecting device exceeds a predetermined acceleration below the resonance region.
washer.

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