JP4756054B2 - Drum washing machine - Google Patents

Abstract

A drum type washing machine (1) includes a housing, a washtub unit (7) accommodated in the housing, a damper (70) for elastically supporting the washtub at a supporting position, a vibration sensor (40) for detecting a vibration of the washtub. The vibration sensor outputs a first signal and a second signal corresponding to a component of vibration of a portion of the washtub along a first direction and a component of the vibration along a second direction perpendicular to the first direction, respectively. The portion of the washtub is between the center plane of the washtub and the opening of the washtub. A controller determines, based on the first and second signals output from the vibration sensor, whether or not the laundry is distributed in the rotary drum in a front unbalance in which the laundry is biased from the center plane towards the opening of the rotary drum, and whether or not the laundry is distributed in the rotary drum in a rear unbalance in which the laundry is biased from the center plane towards the bottom of the rotary drum. The drum type washing machine enables to detect unbalance of a laundry even when the laundry is biased in the rotary drum towards a bottom of the rotary drum.

Description

  The present invention is a water tank in which a rotating drum formed in a bottomed cylindrical shape is elastically supported so that the rotation axis direction is inclined horizontally or downward from the horizontal direction from the opening front side toward the back side as the bottom. The present invention relates to a drum-type washing machine installed inside and driven by a motor fixed to the back of a water tank.

  With reference to FIG. 1 showing the embodiment of the present invention, such a drum type washing machine has a large number of holes in the water tank 3 elastically supported by a vibration damping damper 70 as a suspension structure in the housing 6. The rotating drum 2 is formed in such a manner that the rotating shaft direction is horizontal or inclined downward from the horizontal direction from the front side to the bottom side where the rotating drum 2 is formed. The rotating drum 2 is disposed on the back of the water tank 3. The water tank unit 7 is configured to be rotationally driven by a fixed motor 5, and the front opening of the water tank 3 and the front surface of the rotary drum 2 are opened by opening a door 9 that can be opened and closed at the front side entrance / exit of the housing 1. The laundry can be taken in and out of the rotary drum 2 through the opening. Between the opening of the water tank 3 and the door 9 provided at the entrance / exit of the housing 6 housing the water tank unit 7, there is a pressure contact part through an elastic seal member 41 such as rubber that seals between the two.

  In such a drum-type washing machine, since the rotating drum is horizontal or inclined as described above, if laundry is stored in the rotating drum and rotated, the laundry and water tend to be biased downward. Vibration is likely to occur. In particular, when performing a dehydration process in which the rotating drum is rotated at a high speed to dehydrate the laundry, the laundry containing water is stored in the rotating drum after the washing or rinsing process is completed. Depending on the type, dough, or shape, there is a state where the rotating drum tends to gather at a biased position during the spin-drying process. When the laundry is biased, a large vibration is generated in the water tank that houses the rotating drum, and abnormal vibration and abnormal noise are generated in the washing machine.

  Patent Document 1 discloses a drum-type washing machine of this type in which the rotational speed of a rotating drum is operated over a wide rotational speed range from a low speed to a high speed in a dehydration process, and in that case, the laundry is moved back and forth along the rotational axis. If there is an unbalance, there may be a problem such as a large swinging of the rotating drum depending on the number of rotations, which may cause noise such as collision with the water tank and noise generation. If there is an unbalance, it is said that the swinging is more likely to occur than when there is an unbalance on the rear side. As a technique corresponding to this, Patent Document 1 detects the unbalanced position of the laundry based on the output signal of the vibration component in the plurality of directions output by the vibration detection means capable of detecting the vibration component in the plurality of directions of the water tank. To deal with unbalanced abnormalities.

JP 2006-311884 A

  By the way, with respect to the vibration source of the rotating drum as disclosed in Patent Document 1, the water tank is a resonance target. For this reason, when the water tank resonates at the first and second resonance points, it causes abnormal vibration of the entire water tank unit described above and generates abnormal noise. To solve this problem, it is important to preferentially determine the front imbalance as in the technique described in Patent Document 1 and to deal with it, so that the problem remains, and there is a limit to the rear imbalance. In addition, the press contact portion by the elastic seal member 41 between the housing 6 and the water tank unit 7 has a relatively hard elasticity in order to ensure a sufficient seal pressure that does not allow water or droplets to pass through during washing, rinsing, and dehydration. Since the seal member 41 is used, it also serves as a vibration transmission unit that is higher than the elastic support structure by the vibration isolating damper 70. Therefore, the vibration of the water tank 3 is easily transmitted to the housing 6, and the housing 6 becomes a resonance target.

  In particular, the vibration behavior of the rotating drum at the time of unbalance is a so-called flourwood movement in which the front part swings around the back as disclosed in Patent Document 1, regardless of whether the rotation is unbalanced or not. From the disclosed technical point of view, the back side of the rotating drum is small and there is no fear of contact with the aquarium, but it is a heavy-side vibration source with a fixed motor, and greatly vibrates the front side of the aquarium. In addition to this, it may cause resonance different from the previous unbalance with the aquarium, or may cause damage at the mutual joint due to differences in vibration behavior and vibration load with the aquarium.

  Therefore, the applicant of the present invention is that the weight G center of the water tank unit 7 and the support position of the water 3 are relative to the central position in the direction orthogonal to the rotation axis of the water tank 3 in order to suitably suppress the vibration at the rear part of the water tank unit 7. A drum type washing machine which is located on the back side when viewed in a direction orthogonal to the rotation axis and satisfies the condition that the support position Q by the vibration damping damper 70 is located near the front of the center of gravity G when viewed in the front-rear direction. It has been developed and proposed to the destination.

  In this developed model, the inventor has found that the vibration of the back of the water tank 3, that is, the rear part, has a highly reliable correlation with the vibration of the front part of the water tank 3.

  The object of the present invention is to detect at least the amplitudes in the two front directions from the vibration components in the three directions at the front part of the water tank output from the vibration detection means based on the above-mentioned new knowledge, thereby further improving the front and rear imbalance. It is an object of the present invention to provide a drum type washing machine that detects easily and quickly.

In order to achieve the above object, a drum-type washing machine according to the present invention is configured such that a rotating drum formed in a bottomed cylindrical shape has a horizontal or horizontal rotation axis direction from an opening front side toward a back side as a bottom. In a drum-type washing machine having a water tank unit installed in an elastically supported water tank so as to be inclined downward from the water tank and driven by a motor fixed to the back of the water tank, a direction orthogonal to the rotation axis of the water tank The center of gravity of the water tank unit and the support position of the water tank are both located on the rear side of the center position, and the support position is located near the front of the center of gravity in the front-rear direction of the washing machine housing. Control means for controlling the rotation of the motor, and vibration detection means for detecting vibration components in a plurality of directions at the front part of the water tank, the control means for dehydration after washing and rinsing steps At the time of rotation of the rotary drum in the work, the time when the amplitude of the right and left front direction of the water tub to be output from said vibration detecting means is a first first be less than the threshold value of a predetermined reference value or more is P, the the rise or rising rate in the longitudinal direction of the amplitude before the row after at between P a predetermined time is determined to unbalance before equal to or greater than a predetermined value, it is determined that the rear unbalance is less than the predetermined value It is characterized by.

  In such a configuration, the vibration detection means is located at the front of the water tank and outputs signals corresponding to vibrations in three directions of the front left / right direction, front front / rear direction, and front front / rear direction. The vibration component in the direction is influenced by the vibration component in the left / right direction, the back / front / rear direction, and the back / up / down direction, which is mainly caused by the powdered wood movement in the condition setting of the water tank. It has a correlation with various vibration components in the vertical direction. Accordingly, it is possible to deal with the front / rear unbalance abnormality by using the vibration component that can be directly detected in at least two front directions necessary for the determination of the front / rear unbalance and the front / rear unbalance abnormality.

  Further, when the control means determines the front unbalance, the control means provides a determination of a front unbalance abnormality when the front left / right amplitude is equal to or greater than the first threshold value, and determines that the rear unbalance indicates the front front / rear direction amplitude. When the value is greater than or equal to the second threshold value, it is used for the determination of abnormalities in the rear imbalance. Appropriate judgment can be made.

  Furthermore, under the condition that there is a pressure contact portion through an elastic seal member that seals between the opening of the water tank and the door provided at the entrance / exit of the washing machine housing containing the water tank unit, the water tank Although the vibration of the unit is easily transmitted to the washing machine housing, the abnormal vibration of the washing machine housing can be reliably suppressed by the abnormality handling operation corresponding to the determination of the front and rear unbalance abnormality.

  Further objects and features of the present invention will become apparent from the following detailed description and drawings. The features of the present invention can be employed alone or in combination as much as possible.

  According to the present invention, the signals corresponding to the vibration in the three directions of the front left / right direction, the front / rear direction, and the front / up / down direction of the water tank detected by the vibration detection means at the front part of the water tank are the specific configuration conditions of the water tank unit. Under the influence of vibration components in the rear left / right direction, rear front / rear direction, and rear up / down direction at the rear of the water tank, which are mainly caused by the flourwood movement, various vibration components in the rear left / right direction, the rear front / rear direction, and the rear vertical direction Using the correlation in the relationship, in addition to the vibration components that can be detected directly in at least the front two directions necessary for the determination of front / rear unbalance and the determination of the front / rear unbalance abnormality, the correlation with the vibration components in the front two directions Therefore, it can be used for the determination of the front and rear imbalance and the determination of the front and rear imbalance abnormality, and can cope with the front and rear imbalance abnormality.

Sectional drawing which shows the principal part structure of the drum type washing machine which concerns on embodiment of this invention. The block diagram of the control circuit of the drum type washing machine of FIG. It is an explanatory graph of unbalance determination and unbalance abnormality determination showing the rotational speed change of the rotating drum in the dehydration process. The output signals corresponding to the vibration components in the front left / right, front / rear / front / rear and front / up / down directions detected by the vibration detection means of the water tank of the drum type washing machine in FIG. It is a wave form diagram at the time of balance. FIG. 5 is an explanatory diagram illustrating a procedure for performing front / rear unbalance determination and front / rear imbalance abnormality determination based on the relationship between the front / rear direction vibration component and the front / rear direction vibration component illustrated in FIG. 4; It is a graph which compares and shows each amplitude characteristic in the vibration component of three directions shown in FIG. FIG. 4 is a flowchart showing an example of control including determination of before / after unbalance, determination of before / after unbalance abnormality, and response to an abnormality when the rotational speed of the rotating drum is increased in the dewatering step shown in FIG. 3.

  Hereinafter, a drum type washing machine according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7 for understanding of the present invention. In addition, the following description is a specific example of this invention, Comprising: The content of description of a claim is not limited.

A drum type washing machine 1 according to the present embodiment shown in FIG. 1 houses a water tank unit 7 in a washing machine casing 6. The water tank unit 7 accommodates the rotating drum 2 in the water tank 3, and the rotating shaft 2a of the rotating drum 2 is supported by a bearing 68 provided on the back surface of the water tank 3, and the drum driving motor 5 is supported on the rotating shaft 2a by a bearing 68. Linked above. The rotating drum 2 is arranged together with the water tank 3 such that the direction of the rotating shaft 2a is inclined downward from the horizontal or horizontal direction from the front side to the back side to the bottom side. Since the water tank unit 7 is attached with heavy components such as the bearing 68 and the motor 5 on the back side thereof, the position of the center of gravity G becomes closer to the back side and becomes unstable. Therefore, the water tank unit 7 is supported by the vibration damping damper 70 below the position of the center of gravity G and closer to the front side, and between the upper support fitting 75 fixed to the upper part of the tank 3 and the upper surface of the washing machine casing 6. The water tank unit 7 is urged toward the front side by the first coil spring 71 installed on the front side, and further between the back side below the support height position by the vibration damping damper 70 and the back side of the washing machine housing 6. By installing the second coil spring 72, it is corrected that the aquarium unit 7 supported by the anti-vibration damper 70 nearer to the front side than the position of the center of gravity G falls to the back side, and a support structure having a high damping effect. It is configured. In particular, both the support position Q and the center of gravity G by the vibration damping damper 70 are on the rear side with respect to the center position S in the direction orthogonal to the rotation axis 2a of the water tank 3, and the distance between the center position S and the support position Q is L1 is larger than the distance L2 between the central position S and the center of gravity G, and the support position Q is not behind the center of gravity G when viewed in the direction of gravity. It is easy to suppress the vibration of the side.

  The drum type washing machine 1 of the present embodiment is not shown in the drawing, but the drum type washing machine having a drying function provided with a blower fan for blowing warm air, a heater for generating warm air, etc. in the rotating drum 2. A control means 20 as shown in FIG. 2 is provided to control a series of operation operations including a dryer, washing, rinsing, dewatering, and drying based on an instruction input from the user and an operation state monitoring of each part. Yes.

  The control means 20 rectifies the AC power 31 by the rectifier 32, and uses the DC power smoothed by the smoothing circuit including the choke coil 33 and the smoothing capacitor 34 as the driving power to rotate the motor 5 by the inverter circuit 26. The rotation of the drum drive motor 5 is controlled based on the operation instruction input from the input setting means 21 and the monitoring information of the operation state detected by each detection means, and the water supply valve 14, the drain valve 13, and the air blow are controlled by the load drive means 37. The operation of necessary loads such as the fan 17 and the heaters 18 and 19 is controlled.

  The motor 5 includes a stator having three-phase windings 5a, 5b, and 5c and a rotor having a two-pole permanent magnet, and is configured as a DC brushless motor provided with three position detection elements 24a, 24b, and 24c. The rotation is controlled by a PWM control inverter circuit 26 constituted by the switching elements 26a to 26f. The rotor position detection signals detected by the position detection elements 24a, 24b, and 24c are input to the control means 20, and the on / off states of the switching elements 26a to 26f are PWM-controlled by the drive circuit 25 based on the rotor position detection signals. Thus, energization of the three-phase windings 5a, 5b, and 5c of the stator is controlled to rotate the rotor at a required rotational speed. The control means 20 detects the cycle each time the signal state of any of the three position detection means 24a, 24b, 24c changes, and the rotational speed detection means 24 uses the rotational speed of the rotor as an internal function based on the period. Calculated by

  By the way, as described above, the rotating drum 2 of the water tank unit 7 elastically supported as described above has the direction of the rotating shaft 2a being horizontal or inclined, and when the laundry is stored and rotated, Since water tends to be biased downward, vibration is likely to occur, and in the dehydration process in which the laundry drum is dehydrated by rotating the rotary drum 2 at a high speed of 1000 to 1600 rpm as shown in FIG. After completion of the stroke, the laundry containing water is likely to gather at a biased position of the rotary drum 2 depending on the type, fabric or shape. When the laundry is biased, a large vibration is generated in the water tank 3 that accommodates the rotating drum, and abnormal vibration and abnormal noise are generated in the washing machine. In addition, the press contact portion by the elastic seal member 41 between the housing 6 and the water tank unit 7 has a relatively hard elasticity in order to ensure a sufficient seal pressure that does not allow water or droplets to pass through during washing, rinsing, and dehydration. Since the seal member 41 is used, it also serves as a vibration transmission unit that is higher than the elastic support structure by the vibration isolating damper 70. Therefore, the vibration of the water tank 3 is easily transmitted to the housing 6, and the housing 6 becomes a resonance target.

As disclosed in Patent Document 1, the shake of the front portion of the rotating drum 2 is particularly large, and the water tank 3 becomes an object of resonance from the rotating drum 2 only by eliminating the problem of contact with the water tank 3. Corresponding to the generation of abnormal noise that causes abnormal vibration of the aquarium unit 7 as a result of resonance at a first resonance point near 120 rpm, a second resonance point near 250 rp, and a resonance point above 1000 rpm. However, in terms of abnormal noise, in addition to the front imbalance, there is a limit to the rear imbalance, and it is necessary to deal with both. In addition, the vibration behavior of the rotating drum 2 at the time of unbalance becomes a cause of resonance different from the previous unbalance with the water tank 3 regardless of before and after the unbalance, and the vibration behavior and vibration load with the water tank 3 are different. It is not possible to deal with damages at the joints due to.

  Therefore, in the present embodiment, the center of gravity G of the water tank unit 7 and the support position Q of the water tank 3 with respect to the center position S in the direction of the rotation axis 2a of the water tank 3 are L2 and L1 minutes as viewed in the direction perpendicular to the rotation axis 2a. This condition is satisfied on the back side and the support position Q is located near the front of the center of gravity G when viewed in the front-rear direction so that vibration on the back side and the rear side of the aquarium unit 7 can be easily suppressed. Below, the control means 20 makes use of the fact that the vibration of the back of the aquarium 3, that is, the rear, has a reliable correlation with the vibration of the front of the aquarium 3. A plurality of vibration components in three directions in front of the aquarium that are output from the vibration detection means 40 such as a 3D acceleration sensor provided at the front of the aquarium 3 at the required revolution speed or in the necessary revolution speed range, and Phases of vibration components in at least one direction in the rear three directions From sex, before, the determination of the rear unbalance, before, subjected to the judgment of the rear unbalance abnormal.

  The vibration components in the front three directions during non-abnormal rotation of the rotating drum 2 output by the vibration detection means 40, that is, during steady rotation, are a front-rear direction signal FLR, a front-rear direction signal FFR, and a front-up-down direction FUD. From the experimental example, in the case of the front unbalance where the laundry unbalance (front 500 g) is on the front side of the water tank 3, the relationship is as shown in FIG. In the case of post-unbalance where there is laundry unbalance (after 500 g), the relationship is as shown in FIG. 4 (b), and there is laundry unbalance (500 g in middle) in the center of the aquarium 3. In this case, the relationship is as shown in FIG.

  Here, the amplitude of the front / rear direction signal FLR, the front / rear direction signal FFR, and the front / rear direction FUD signal other than the front / rear direction signal FFR detected by the vibration detection means 40 at the front portion of the aquarium 3 is The rear unbalance is lower than that at the balance, and the amplitude at the middle unbalance is between the front unbalance and the rear balance. The amplitude of the signal FFR in the front / rear direction is lower in the rear unbalance than in the front unbalance, and the amplitude in the middle unbalance is smaller than that in the front unbalance and the rear balance. This means that the amplitude of each of the front left / right direction signal FLR, front front / rear direction signal FFR, front front / upward direction FUD signal detected by the vibration detection means 40 at the front of the water tank 3 is not limited to the front unbalanced state. It shows that there is a correlation between the middle unbalanced state and the rear unbalanced state. As shown in FIGS. 4A to 4C, this correlation is the magnitude of the amplitude of the same vibration component, the magnitude order of the amplitudes of the vibration components in the three directions, the rate of increase of the amplitude, or the inclination angle. It appears as a difference in magnitude, amplitude period, amplitude phase difference, and the like.

  Thus, the vibration detection means 40 is at the front part of the water tank 3 and outputs signals FLR, FFR, and FUD corresponding to vibrations in the three directions of the front / left / right direction, front / rear direction and front / rear direction. The detected vibration components in the three directions are the vibration components in the rear left / right direction (RLR), the rear front / rear direction (RFR), and the rear up / down direction (RUD), which are mainly caused by the flour powder movement in the above-described condition setting of the water tank 3. As a result, there is a correlation in various relations with the vibration components in the rear left / right direction, the rear front / rear direction, and the rear vertical direction. In this way, in addition to the vibration components that can be detected directly in at least the front two directions necessary for the determination of front / rear unbalance and the determination of the front / rear unbalance abnormality, vibration components in the rear one direction are detected from the correlation with the vibration components in the front three directions Thus, it can be used for the determination of the front and rear imbalances and the determination of the front and rear imbalance abnormality, and can cope with the front and rear imbalance abnormality.

  The front and rear imbalance abnormalities may be determined for the amplitude of the output signal in the direction corresponding directly or indirectly to each other, but by determining whether or not the determination is greater than a predetermined threshold corresponding to each, Appropriate determination can be made in accordance with the difference in characteristics of the rear balance abnormality, for example, the difference that the front unbalance can increase the tolerance more than the rear unbalance.

  Hereinafter, the determination of front / rear unbalance and the determination of front / rear unbalance abnormality using the correlation between the front / rear direction vibration component output signal FFR and the front / rear direction vibration component output signal FLR. A specific example in the case of dealing with will be described. A vibration detecting means 40 for detecting vibration components in a plurality of directions is provided at the front of the water tank 3, and the control means 20 is a vibration detecting means in the process of increasing rotation as shown in FIG. 3 in the dehydrating operation after the washing and rinsing steps. For example, based on output signals FFR, FLR, and FUD of a plurality of vibration components in front and rear directions (FFR), front left and right directions (FLR), and front up and down directions (FUD) as shown in FIG. As shown in FIG. 5, the amplitude P of the output signal FLR related to the vibration component in the left-right direction before the occurrence is a pre-unbalance abnormality, and is a time point P that is equal to or greater than a predetermined first reference value b1 that is less than the first threshold A1. The increase width ΔB of the amplitude B2 of the output signal FFR related to the vibration component in the front / rear direction generated after the output signal FLR after the predetermined time t from a predetermined time t to a predetermined time t as shown in FIG. 2 or more of the reference value B2 If it is less than the predetermined second reference value B2 as shown in FIG. 5B, it is determined once as a rear imbalance, and the front and rear unbalance abnormalities are determined. Provide one-time or multiple-time judgments, and response to unbalance abnormalities before and after.

  Thus, the vibration detection means 40 is on the water tank 3 and outputs signals FFR, FLR, FUD corresponding to vibrations in a plurality of directions including the front left / right direction and the front / rear direction of the water tank 3. Since the phase of the output signal FLR related to the vibration component of the front is ahead of the output signal FFR related to the vibration component in the front / rear direction, whether or not the output signal FLR related to the vibration component in the front / rear direction is equal to or greater than the first reference value B1 It can be detected ahead of others. The increase width ΔB or the increase rate ΔB / t of the output signal related to the vibration component FFR in the rear unbalance direction during the predetermined time t from the time point P at which the first reference value or higher is detected is equal to or higher than the second reference value. It is possible to determine whether it is a post-unbalance or a pre-unbalance by using the correlation with whether it is a post-unbalance.

  After the determination of the rear imbalance, as shown in FIG. 5 corresponding to whether the amplitude of the detected output signal FFR of the vibration component in the rear imbalance direction is abnormal rear imbalance, for example, the correlation at the time of rear imbalance Can be used for one or more determinations of a post-unbalance abnormality depending on whether or not it is equal to or greater than the second threshold value A2 obtained by subtracting A3 set by the above, and can be used for dealing with an abnormality. Further, the front unbalance abnormality is shown in FIG. 5 in which the amplitude of the output signal FLR of the vibration component in the front left / right direction that is detected ahead of time without determining the front unbalance is correlated with the front unbalance abnormality. It can be used for one or more determinations of pre-unbalance abnormality depending on whether or not it is greater than or equal to the first threshold value A1, and can be used for dealing with abnormal cases. In addition, the determination of the front imbalance abnormality can be omitted at least until the first reference value B1 is exceeded, and can be omitted even after the rear imbalance determination in order to prioritize the response to the rear unbalance abnormality. .

According to such a technique, the relationship between the two output signals FLR and FFR output by the vibration detection means 40 is skillfully used, and the front left-right direction preceding the output signal FFR related to the vibration component in the front-rear direction. The increase width ΔB or the increase rate ΔB / t of the former output signal FFR during the predetermined time t from the detection time point P when the output signal FLR related to the vibration component is equal to or higher than the first reference value B1 is the second reference value. By determining the post-unbalance depending on whether or not it is greater than or equal to B2, the output signal FFR relating to the detected vibration component in the post-unbalance direction is detected from the subsequent unbalance abnormality depending on whether the amplitude is greater than or equal to the second threshold A2. The output signal FLR of the vibration component in the left-right direction, which is used for one or a plurality of determinations and is detected prior to the other, is further simplified by simply determining whether the amplitude is greater than or equal to the first threshold value A1. It is possible to easily and quickly achieve the determination of the balance abnormality once or a plurality of times, and it is possible to deal with the abnormality. Moreover, the determination of the pre-unbalance abnormality can be omitted at least until the first reference value B1 is exceeded.

  FIG. 6 shows the temporal change in front left / right amplitude, front front / rear amplitude, and rear left / right amplitude due to the rear unbalance of the laundry, and the difference in peak value. The front left and right amplitudes are earlier in time and the peak values are higher in each stage, which is a good representation of the flour movement, and the relationship between the front left and right amplitudes and the front front and rear amplitudes. It can be seen that the amplitude can be evaluated.

  Further, by providing the vibration detection means 40 closer to the front part of the water tank 3, it can be said that the vibration component in the front left / right direction and the vibration component in the front / rear direction are easily reflected in the output signal of the vibration detection means 40. .

  Here, according to one embodiment, the first reference value B1 is effective when it is 15 mm or more, the predetermined time t is 2 seconds, the second reference value B2 is 1 mm or more, and the first threshold value A1 is 25 mm. The second threshold A2 is effective as a rear unbalance of 20 mm. However, it is not limited to this. Here, the relationship of A1> A2 is that the influence of the vibration at the time of the rear unbalance abnormality is larger than the case of the front unbalance abnormality, and the influence on the front unbalance abnormality and the aquarium unit 7 itself and the surroundings becomes a problem. Correspondingly, the determination values for the front and rear imbalance abnormalities are made different, and the determination threshold A2 for the rear imbalance abnormality is made stricter than the determination threshold A1 for the front imbalance abnormality.

  Specifically, when such first and second threshold values A1 and A2 are used, the pre-unbalance abnormality is caused by the fact that the amplitude of the corresponding output signal FLR is not less than the first threshold value A1 stored in advance. The post-unbalance abnormality is determined by determining that the amplitude of the corresponding output signal FFR is higher than the first threshold value A1 by substituting the second threshold value A2 for a value A1-A3 that is lower by a predetermined width A3. To do. As described above, the maximum amplitude value of the corresponding output signal FLR to be determined as the pre-unbalance abnormality reflects an allowable relationship more than the maximum amplitude value of the corresponding output signal FFR to be determined as the post-unbalance abnormality. By substituting the threshold value for the determination of the rear imbalance abnormality with a value that is a predetermined width lower than the first threshold value that is the maximum amplitude value of the corresponding output signal for determining the front imbalance abnormality, only the first threshold value A1 is used. It is possible to determine and deal with the first before and after unbalance abnormalities corresponding to the differences in their properties and influences simply by storing them in advance. It should be noted that the post-unbalance abnormality is determined by adding a predetermined width to the detected amplitude value of the corresponding output signal FFR and determining whether it is greater than or equal to the first threshold value A1. This is equivalent to substituting the value A1-A3 lower by A3 for the second threshold value A2, and the same effect is obtained.

  By the way, separately from the above, when the amplitude of the output signal FLR related to the previous unbalance is less than the first reference value B1, it can be determined as the previous unbalance. Thus, using the detection prior to the output signal FLR corresponding to the previous unbalance abnormality, when the amplitude of the output signal FLR corresponding to the previous unbalance abnormality is less than the first reference value B1, By omitting the determination of the rear unbalance abnormality and determining the front unbalance abnormality, it corresponds to the front unbalance. At this time, if the amplitude of the output signal related to the pre-unbalance is less than the first reference value B1, no abnormal vibration will occur even if there is a post-unbalance abnormality.

In addition to the above, when the laundry is less than the predetermined amount and the amplitude of the output signal related to the front imbalance is equal to or larger than the first reference value B1, it can be determined that the rear imbalance is present. As described above, the amount of laundry, that is, the amount of cloth correlates with the rotational load of the rotary drum 2, so that it is shown in FIG. 2 in accordance with the load state received by the motor 5 when the rotary drum 2 is started up at a predetermined rotational speed. The change in the current flowing through the inverter circuit 26 is detected by the current detection circuit 29 from the voltage across the resistor 28 connected in series with the current circuit, and the cloth as an internal function of the control means 20 is detected from the detected current amount. It can be detected by the quantity detection means 30. However, it is not limited to this. Therefore, using the fact that the laundry is less than the predetermined amount tends to be concentrated on the back side of the rotating drum 2 and that it is detected prior to the output signal FFR corresponding to the rear unbalance abnormality, When the amplitude of the output signal FLR corresponding to the front unbalance abnormality is equal to or greater than the first reference value when the laundry is less than the predetermined amount, the determination of the front unbalance abnormality is omitted and the rear unbalance abnormality is determined, thereby washing It is possible to determine an early imbalance abnormality and deal with it after the object is biased toward the back side of the rotating drum 2.

  Further, in order to determine the unbalance abnormality multiple times, in particular, after the first determination that the amplitude of the output signal FLR related to the pre-unbalance is equal to or greater than the first threshold A1 stored in advance or the post-unbalance, Until the amplitude of the output signal FFR related to the rear imbalance reaches a value A1-A3 which is a predetermined width A3 lower than the first threshold value A1, the rotation of the rotary drum 2 is increased to the target rotational speed, the front imbalance abnormality or When the rotation of the rotating drum 2 is less than a predetermined number of rotations when the rear imbalance is abnormal, the rotation number is temporarily reduced or stopped, or the arc rotation that lifts the laundry to the left and right and drops it to the other is forward and reverse. After the unbalance elimination operation that repeatedly performs forward and reverse arc rotation driving, the rotation is increased again toward the target rotation speed, and if it exceeds the predetermined rotation speed, control to maintain the rotation speed is also performed thereafter. Obtain.

  In such a control method, in order to determine an unbalance abnormality a plurality of times, it is first determined whether the amplitude of the output signal FLR related to the pre-unbalance is equal to or greater than the first threshold A1 stored in advance or the post-unbalance. After that, by rotating the rotation of the rotary drum 2 toward the target rotational speed until the amplitude of the output signal FFR related to the rear imbalance becomes equal to or more than the value A1-A3 that is a predetermined width A3 lower than the first threshold value A1, The target rotational speed can be approached until the front and rear unbalance abnormalities are determined. If the rotation of the rotary drum 2 is less than a predetermined rotation speed that can eliminate the sticking of the laundry when the front imbalance abnormality or the rear imbalance abnormality occurs, the rotation speed is temporarily reduced or stopped, or the laundry is An unbalance elimination operation that performs forward and reverse arc rotation drive that repeats forward and reverse arc rotation that is lifted to the left and right and dropped to the other, and after increasing the rotation toward the target rotational speed again after eliminating the cause of unbalance, The target rotational speed can be made closer to the target rotational speed without incurring the front and rear unbalance abnormalities. The dehydrating operation can be completed without causing any abnormality. For this purpose, the judgment value of the front and rear imbalance abnormality is set to a value less than the value at which actual harm starts to occur, and the time of the dehydration process is extended according to the degree to which the maintained rotational speed is lower than the target rotational speed. Is preferred. In one embodiment, the predetermined rotation speed is effective as about 880 to 900 rpm.

  Therefore, the amplitude of the output signal FFR related to the rear imbalance is equal to or higher than the first threshold value A1 stored in advance or whether the output signal FFR related to the rear imbalance is first determined after the first determination. By further increasing the rotation of the rotary drum 2 toward the target rotational speed until the value A1-A3 is lower than the threshold A1 by a predetermined width A3, the simpler before and after of storing and using only the first threshold A1 is used. In the unbalance abnormality determination operation, the target rotational speed can be approached without any problem, and if the rotating drum 2 is less than the predetermined number of rotations when the front unbalance abnormality or the rear unbalance abnormality occurs, the rotation control for unbalance cancellation is performed. The rotation is increased again toward the target rotational speed, and the target rotational speed can be further brought closer without causing an imbalance abnormality before and after.

  Here, an example of performing dehydration control while corresponding to the presence of front-rear balance abnormality accompanied by the determination of front-rear unbalance, determination of front-rear unbalance abnormality and the determination of front-rear unbalance while citing rotation of the rotating drum 2, This will be specifically described with reference to the flowchart shown in FIG.

When the dehydration process starts in step 100, a draining operation for draining the washing water in the water tank 3 is performed in step 101. Thereafter, after data initialization (N = 1) in step 102, the rotary drum 2 is rotated forward at a third predetermined rotational speed (for example, about 40 rpm) in order to loosen the laundry such as uneven clothes, Reverse operation (unraveling process) is performed. Next, in step 103, the laundry is gradually raised to a fourth predetermined rotational speed (about 70 rpm) that allows the laundry to stick to the inner surface of the rotary drum 2. Thereafter, the rotational speed of the rotary drum 2 is further increased, and control is performed in step 104 to maintain the rotary drum 2 at a first predetermined rotational speed (for example, about 80 rpm) lower than the primary resonance rotational speed for a predetermined time. At this time, the rotation unevenness, that is, the presence or absence of the initial imbalance is detected. It is sufficient to determine the unbalanced state on behalf of the front left / right unbalance, which also reflects. The determination threshold value A1-I is generally set to 40 mm, which is larger than the threshold value A1 set near the secondary resonance rotational speed and set to A1 + α. Note that the determination can also be made based on the fact that the detected rotational speed detection means (signals (rotation unevenness) from the position detection means 24a, 24b, 24c24) are not output at a predetermined interval (rotation unevenness is large).

  Here, if there is an unbalance greater than or equal to a predetermined value, it is determined that the rotation unevenness 2 is large and the balance state is poor, and it is determined in step 105 whether or not N = 4. If N = 4 is not satisfied, the rotating drum 2 is temporarily stopped in the next step 106, and 1 is added to N at the present time in step 107 and the process returns to step 102. When the operations from step 102 to 107 are repeated a predetermined number of times, that is, when N = 4 in step 105, it is considered that the unevenness of the laundry has not been eliminated in the loosening process in step 102, and the process proceeds to step 108. To do. In Step 108, if N is less than 10, the process proceeds to Step 110, where water is poured into the rotary drum 2 to correct the unevenness of the laundry, and the process returns to Step 101. If this operation is N = 10, it is considered that the unevenness of the laundry could not be resolved, the process proceeds to step 109, an imbalance abnormality is displayed, and the operation is stopped.

  Passing through step 104, the rotating drum 2 vibrates in front of the aquarium unit 7 at the section “1”: 120 to 140 rpm (near the primary resonance rotational speed) at step 111, before and after the unbalance, and before and after the unbalance. If the judgment is made based on the output signal from the detection means 40 and the front or rear imbalance abnormality is detected, the process proceeds to step 105, where the cloth bias correction operation, that is, the rotational speed of the rotary drum 2 is temporarily reduced or stopped, or If you do not have any imbalance abnormality before or after unbalance cancellation, it is normal if you do forward rotation of forward and reverse arc rotation that repeats forward and backward arc rotation that lifts the laundry to the left and right and drops it to the other. Control goes to step 112. Here, the determination of the front and rear imbalances is simple and early with the front unbalance when the front up / down amplitude / front front / rear amplitude <1 and the front unbalance when the front vertical amplitude / front front / rear amplitude> 1. You can also Further, since the vicinity of the primary resonance rotation speed of the aquarium unit 7 is generally larger in the front left / right direction than the vicinity of the secondary resonance rotation speed, the threshold value A1-II is equal to the threshold value A1 near the secondary resonance rotation speed described above. 40 mm larger than 25 mm is set. The rear imbalance abnormality threshold A2-II is L2 when viewed in the direction in which the center of gravity G of the water tank unit 7 and the support position Q of the water tank 3 are perpendicular to the rotation axis 2a with respect to the center position S of the water tank 3 in the direction of the rotation axis 2a. Since it is located on the back side of L1 and the support position Q is in the vicinity of the front of the center of gravity G when viewed in the front-rear direction, it is effective to be lower than 240 mm.

Step 111 is passed, and in step 112, the vibration detection means 40 detects abnormalities before, after unbalance, before and after the water tank unit 7 in the section “2”: 141 to 330 r / min (near the secondary resonance rotational speed). If the front or rear imbalance abnormality is detected, the process proceeds to step 105, where the cloth bias correction operation, that is, the rotational speed of the rotary drum 2 is temporarily reduced or stopped, or the laundry is removed. If the normal or reverse unbalance abnormality does not occur after performing the rotation control for unbalance cancellation that repeats the forward and reverse arc rotation driving to reverse the arc rotation that is lifted to the left and right and dropped to the other, step 113 is performed. Transition. Here, the determination of the front / rear unbalance is made based on the first and second reference values B1 and B2 described above, and if there is no front or rear unbalance abnormality and it is normal, The threshold value A1-III for the left / right imbalance abnormality is effectively set as low as about 25 mm. The rear imbalance abnormality threshold value A2-III is L2 when viewed in the direction in which the center of gravity G of the water tank unit 7 and the support position Q of the water tank 3 are perpendicular to the rotation axis 2a with respect to the center position S of the water tank 3 in the direction of the rotation axis 2a. Since it is located on the L1 portion back side and the support position Q is in the vicinity of the front of the center of gravity G when viewed in the front-rear direction, 20 mm is effective.

  Step 112, and in step 113, in front of the rotation area where it becomes difficult to eliminate the sticking of the laundry to the rotating drum 2, for example, at 880 to 900 rpm, before the aquarium unit 7, the rear unbalance, the front and the rear unbalance When the balance abnormality is determined based on the output signal from the vibration detecting means 40, and the front or rear unbalance abnormality is detected, the process proceeds to step 105, where the cloth bias correction operation, that is, the rotational speed of the rotary drum 2 is temporarily reduced, or Stop or lift the laundry to the left and right and drop it to the other. After performing forward / reverse arc rotation driving to repeat forward / reverse arc rotation, the control shifts to step 114, and then proceeds to step 114, before or after unbalance If there is no abnormality and it is normal, in step 115, the rotating drum 2 is rotated up to the maximum number of rotations and returned to step 114. That. If the front or rear unbalance abnormality does not occur and the operation is normal, the process proceeds to step 115. If the operation is normal, the maximum rotational speed is reached, the operation is continued for a predetermined time, and then the operation is stopped in step 117. Proceed to the process. On the other hand, when the vibration signal value becomes larger than the threshold value at each rotation speed in Step 115, that is, when it becomes NG, the process proceeds to Step 116, the rotation speed at that place is maintained, and after operation for a predetermined time, The operation is stopped at 117 and the process proceeds to the next step of step 118. In this case, it is possible to easily and quickly determine the front imbalance when the front / rear amplitude is equal to or smaller than the front left / right amplitude, and the front / rear amplitude is greater than the front left / right amplitude. In this case, since the threshold value A1-IV of the front left / right imbalance abnormality in this rotation region is a high-speed rotation region, it is effective to set it gradually lower as the rotation speed increases from about 12 mm from the strength of the aquarium unit 7. It is. The rear imbalance abnormality threshold A2-IV is a direction in which the center of gravity G of the water tank unit 7 and the support position Q of the water tank 3 are perpendicular to the rotation axis 2a with respect to the center position S in FIG. 4 and the direction of the rotation axis 2a of the water tank 3. Since it is located on the L2 and L1 back side as viewed, and the support position Q is located near the front of the center of gravity G when viewed in the front-rear direction, it is effective as a setting that is set to be smaller by about 2 mm and gradually lower than 10 mm. .

  When the cloth bias correction operation in step 105 is performed by forward / reverse arc rotation of the rotating drum 2, the rotating drum 2 is rotated at a rotational speed of 40 rpm or more so that the rotating drum can be rotated during sudden braking to reverse the forward / reverse direction. Since a strong inertial force is applied to the laundry attached to 2 and peeled off from the rotating drum 2, the laundry is dropped in a direction opposite to the left and right sides, so that the laundry can be effectively peeled off. Also, the peeled laundry can be loosened while being switched left and right by the subsequent forward and reverse arc rotation, and can be distributed evenly in the front and rear and left and right within the rotating drum 2. Such a left-right interchange of the laundry requires that the laundry be lifted higher, and therefore, it is preferable to perform forward and reverse arc rotation of the rotary drum 2 at an angle of, for example, more than 90 ° and less than 180 °.

  It is practically used for dewatering in a drum-type washing machine with a rotating drum installed horizontally or at an angle, and the judgment of before / after imbalance due to laundry bias, before / after imbalance abnormality is judged at least before the aquarium It can be done easily and quickly from the vibration information in two directions, and can handle abnormalities accurately.

DESCRIPTION OF SYMBOLS 1 Drum-type washing machine 2 Rotating drum 2a Rotating shaft 3 Water tank 5 Motor 6 Washing machine housing 7 Water tank unit 9 Door 20 Control means 24 Rotational speed detection means 30 Cloth amount detection means 40 Vibration detection means 70 Anti-vibration damper

Claims (3)

A rotating drum formed in a cylindrical shape with a bottom is installed in a water tank that is elastically supported so that the axis of rotation is inclined horizontally or horizontally downward from the opening front side to the bottom side. In a drum-type washing machine having a water tank unit that is driven by a motor fixed to the back of the water tank,
The center of gravity of the water tank unit and the support position of the water tank are both located on the rear side of the center position with respect to the center position orthogonal to the rotation axis of the water tank, and the support position is in the front-rear direction of the washing machine casing. Having a condition of being located near the front of the center of gravity,
Control means for controlling the rotation of the motor and vibration detecting means for detecting vibration components in a plurality of directions at the front of the water tank, the control means rotating the rotating drum in a dehydrating operation after washing and rinsing steps In some cases, a point in time when the amplitude in the front left / right direction of the aquarium output from the vibration detecting means is less than the first threshold and becomes equal to or greater than a predetermined first reference value is defined as P. rise or rising rate in the longitudinal direction of the amplitude before the line is determined to unbalance before equal to or greater than a predetermined value after the drum-type laundry, characterized in that to determine the rear unbalance is less than the predetermined value Machine.   When it is determined that the front unbalance is greater than or equal to the first threshold value, the control means provides a determination of a front unbalance abnormality when the front left / right amplitude is equal to or greater than the first threshold value. 2. The drum type washing machine according to claim 1, wherein when it is equal to or greater than a threshold value of 2, the rear unbalance abnormality is determined.   The pressure contact part through the elastic seal member which seals between both is provided between the opening part of the water tank and the door provided in the entrance / exit of the washing machine housing | casing which accommodated the water tank unit. Or the drum type washing machine of 2.

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