CN107709650A

CN107709650A - Dewaterer

Info

Publication number: CN107709650A
Application number: CN201680028339.XA
Authority: CN
Inventors: 川口智也; 佐藤弘树
Original assignee: Qingdao Haier Washing Machine Co Ltd; Haier Asia Co Ltd
Current assignee: Qingdao Jiaonan Haier Washing Machine Co Ltd; Haier Asia Co Ltd
Priority date: 2014-06-30
Filing date: 2016-05-26
Publication date: 2018-02-16
Anticipated expiration: 2036-05-26
Also published as: JP2016026536A; US20180155862A1; KR20180012807A; JP6350874B2; CN107709650B; WO2016000479A1; WO2016000433A1; KR102005360B1

Abstract

The present invention provides a kind of dewaterer, and it can realize washings whether there is the raising of the accuracy of detection of bias.Dewaterer (1) includes the electric motor (6) and control unit (30) for rotating dehydration barrel (4).Control unit (30) determines the load of the washings (Q) in dehydration barrel (4) when dehydration barrel (4) starts rotation.Control unit (30) is after the measure of load is completed, by the dutycycle for controlling the voltage applied to motor (6), motor (6) is set to be rotated with the first rotary speed constant speed, then, motor (6) is made to be rotated with the second rotary speed constant speed higher than the first rotary speed.Control unit (30) obtains reference duty cycle under the acceleration mode untill motor (6) accelerates to the first rotary speed, in the timing determined according to the load measured.After obtaining reference duty cycle, within specified time limit, the index for the situation that control unit (30) is changed based on expression dutycycle relative to reference duty cycle, judge the washings (Q) in dehydration barrel (4) whether there is bias.

Description

Dewaterer

Technical field

The present invention relates to a kind of dewaterers.

Background technique

Following patent documents 1 disclose a kind of washing machine with dehydrating function.When carrying out the dehydration operating of washings in the washing machine, the duty ratio for the voltage for applying the motor for the Washing dewatering tub rotation for containing washings by control, after with the rotation of 120rpm constant speed, with the rotation of 240rpm constant speed, finally with the rotation of 800rpm constant speed.

When the washings in Washing dewatering tub carries out dehydration operating under the non-equilibrium state that bias is configured at the circumferencial direction of Washing dewatering tub, vibration, noise become larger.Therefore, whether there is or not bias for the washings in the washing machine in detection Washing dewatering tub.

Specifically, the duty ratio at the time point that the rotation speed of motor have passed through 3.6 seconds after accelerating since 120rpm is to 240rpm is taken as reference duty cycle.In addition, with motor using 240rpm constant speed rotation in the state of over time and change duty ratio related target value duty ratio as compared with, be based on reference duty cycle operation and obtain.Moreover, there are the bias of washings for judgement when obtaining the difference of primary actual duty cycle duty ratio compared with same timing to be more than defined threshold per defined timing in the state that motor is rotated using 240rpm constant speed, stop the rotation of motor.

Existing technical literature

Patent document

Patent document 1: Japanese Unexamined Patent Publication 2011-240040 bulletin

Problem to be solved by the invention

The washing machine of patent document 1 judges that the rotation speed of motor have passed through 3.6 seconds time points after the rotation speed of motor accelerates since 120rpm is to 240rpm and reach 240rpm, and the duty ratio at the time point is considered as reference duty cycle.

But the time needed for reaching 240rpm as the rotation speed of motor can change according to the size of the load of the washings in Washing dewatering tub, be not necessarily limited to above-mentioned 3.6 seconds.

Reference duty cycle is left and right washings an important factor for whether there is or not the detection accuracy of bias.But in the case where patent document 1, the size of load is not considered, and the duty ratio at the time point for having begun to pass through 3.6 seconds from the acceleration of motor is considered as reference duty cycle without exception.Therefore, when the reference duty cycle is is influenced to cause by load in the duty ratio that the timing for deviateing correct timing obtains, it is possible to can whether there is or not the generation adverse effects of the detection accuracy of bias to washings.

In addition, having detection washings like this, whether there is or not in the case where the structure of bias, seek to solve the problems, such as to be the time for shortening dehydration operating always.

Summary of the invention

The present invention is the technical solution completed based on the background, is able to achieve washings its purpose is to provide a kind of whether there is or not the dewaterers of the raising of the detection accuracy of bias.

In addition, the object of the invention is also to provide a kind of dewaterers that the time for being able to achieve dehydration operating shortens.

The solution to the problem

The present invention is a kind of dewaterer characterized by comprising dehydration barrel accommodates washings, rotated so that washings to be dehydrated；Electric motor rotates the dehydration barrel；Load determination unit measures the load of the washings in the dehydration barrel when the dehydration barrel starts rotation；Drive control unit, after the measurement for carrying out load by the load determination unit, by the duty ratio for controlling the voltage applied to the motor, rotate the motor with the first rotation speed constant speed, then, the motor is rotated so that washings is formally dehydrated with the second rotation speed constant speed higher than first rotation speed；The duty ratio of the voltage applied under acceleration mode until the motor accelerates to first rotation speed to the motor is taken as reference duty cycle by acquisition unit；Timing determination unit determines that the acquisition unit obtains the timing of the reference duty cycle；Judging unit, after the acquisition unit obtains the reference duty cycle, in during the prescribed period, based on the index for representing the case where maintaining first rotation speed and changing to the duty ratio for the voltage that the motor applies relative to the reference duty cycle, whether there is or not bias for the washings for judging in the dehydration barrel；And stop control unit, judge to stop the rotation of the dehydration barrel, the timing determination unit is measured according to the load determination unit there are in the case where the bias of washings in the judging unit Load determines that the acquisition unit obtains the timing of the reference duty cycle.

Furthermore, the present invention is characterized in that, it include: execution unit, it selects the processing of the bias of the washings in the rotation and the amendment dehydration barrel of the dehydration barrel of dehydration of the execution for restarting washings according to the index in the case where the stop control unit stops the rotation of the dehydration barrel.

Furthermore, the present invention is characterized in that, the drive control unit is before rotating the motor with the first rotation speed constant speed, rotate the motor with the fixing speed constant speed lower than first rotation speed, the execution unit shortens the duration for rotating the motor with the fixing speed constant speed in the case where executing the rotation of the dehydration barrel for restarting the dehydration of washings.

In addition, dewaterer of the invention characterized by comprising dehydration barrel accommodates washings, rotated so that washings to be dehydrated；Electric motor rotates the dehydration barrel；Drive control unit, by the duty ratio for controlling the voltage applied to the motor, it rotates the motor with the first rotation speed constant speed, then, rotates the motor so that washings is formally dehydrated with the second rotation speed constant speed higher than first rotation speed；Acquisition unit, it is interior during the prescribed period after the motor starts to accelerate to first rotation speed, the primary duty ratio is obtained per defined timing；Counting unit, when the duty ratio obtained by the acquisition unit is more than or equal to the last duty ratio obtained, the count value that initial value is zero is added 1, when the duty ratio obtained by the acquisition unit is less than the last duty ratio obtained, the count value is reset into the initial value；Judging unit judges the bias in the dehydration barrel there are washings when the count value is more than or equal to defined threshold value；And stop control unit, judge to stop the rotation of the dehydration barrel there are in the case where the bias of washings in the judging unit.

In addition, the present invention is a kind of dewaterer characterized by comprising dehydration barrel accommodates washings, rotated so that washings to be dehydrated；Electric motor rotates the dehydration barrel；Drive control unit, by the duty ratio for controlling the voltage applied to the motor, it rotates the motor with the first rotation speed constant speed, then, rotates the motor so that washings is formally dehydrated with the second rotation speed constant speed higher than first rotation speed；Acquisition unit, the rotation speed of the motor from first rotation speed in a period of reaching second rotation speed, the primary duty ratio is obtained per defined timing；Judging unit judges the bias in the dehydration barrel there are washings when the duty ratio that the acquisition unit obtains is more than or equal to defined threshold value；Stop control unit judges to stop the rotation of the dehydration barrel there are in the case where the bias of washings in the judging unit；Receiving unit receives selection related with the dehydration conditions of washings；And threshold value changing unit, it is changed according to the dehydration conditions of the received selection of the receiving unit The threshold value.

In addition, the present invention is a kind of dewaterer, which is characterized in that have: dehydration barrel accommodates washings, is rotated so that washings to be dehydrated；Electric motor rotates the dehydration barrel；Drive control unit, by the duty ratio for controlling the voltage applied to the motor, it rotates the motor with the first rotation speed constant speed, then, rotates the motor so that washings is formally dehydrated with the second rotation speed constant speed higher than first rotation speed；The maximum value of the duty ratio under acceleration mode until the motor accelerates to first rotation speed is taken and does maximum duty cycle by acquisition unit；Computing unit calculates the aggregate-value of the duty ratio of per stipulated time and the difference of the maximum duty cycle after the acquisition unit obtains the maximum duty cycle；Judging unit judges the bias in the dehydration barrel there are washings when the aggregate-value is less than defined threshold value；And stop control unit, judge to stop the rotation of the dehydration barrel there are in the case where the bias of washings in the judging unit.

In addition, it is a feature of the present invention that the threshold value using count value and the maximum duty cycle as the formula of variable by finding out, wherein the count value be add per the stipulated time it is 1 primary.

Furthermore, the present invention is characterized in that, the drive control unit controls the duty ratio as follows: under the acceleration mode until the motor accelerates to first rotation speed, when the revolving speed that the dehydration barrel described in rotating ratio resonates is slightly lower, generating the maximum duty cycle.

Invention effect

Through the invention, dehydration as dewaterer operates, the duty ratio of the voltage for the electric motor for rotating dehydration barrel is applied to by controlling, rotate motor with the first rotation speed constant speed, then, rotate motor with the second rotation speed constant speed higher than the first rotation speed, the washings in dehydration barrel is formally dehydrated as a result,.

With the washings in dehydration barrel whether there is or not the detections of bias in association, under the acceleration mode until motor accelerates to the first rotation speed, reference duty cycle is obtained by acquisition unit.Then, after acquisition unit obtains the reference duty cycle, in during the prescribed period, based on the index for representing the case where maintaining the first rotation speed and changing to the duty ratio of voltage that motor applies relative to reference duty cycle, whether there is or not bias for the washings for judging in dehydration barrel.In judgement there are in the case where the bias of washings, stop the rotation of dehydration barrel.

As such whether there is or not a ring of the detection of bias, when dehydration barrel starts rotation, the load of the washings in dehydration barrel is measured, timing determination unit determines the timing of acquisition unit acquirement reference duty cycle according to the load measured.As a result, since the correct timing in the influence in view of load obtains reference duty cycle, Therefore it can be based on the reference duty cycle, precisely executing washings, whether there is or not the detections of bias.As a result, realizing washings, whether there is or not the raisings of the detection accuracy of bias.

Furthermore, through the invention, according to the rotation for stopping dehydration barrel there are the judgement of the bias of washings, based on the index for indicating the case where duty ratio changes relative to reference duty cycle, the processing of the rotation of the dehydration barrel of dehydration of the execution for restarting washings and the bias of the washings in amendment dehydration barrel is selected.

That is, not necessarily executing the processing of the bias of amendment washings without exception when judgement is there are when the bias of washings.Therefore, when the lesser index of the bias that the index is washings, dehydration barrel is rotated immediately, restarts dehydration, hereby it is achieved that the time of dehydration operating shortens.

Furthermore, through the invention, in the dehydration operating for including the steps that rotating motor with the fixing speed constant speed lower than the first rotation speed, in the case where the rotation for executing the dehydration barrel for restarting the dehydration of washings, since the duration of the step is shortened, the time that dehydration operating is furthermore achieved shortens.

Furthermore, through the invention, as the dehydration operating in dewaterer, the duty ratio of the voltage for the electric motor for rotating dehydration barrel is applied to by controlling, it rotates motor with the first rotation speed constant speed, then, rotates motor with the second rotation speed constant speed higher than the first rotation speed, the washings in dehydration barrel is formally dehydrated as a result,.

With the washings in dehydration barrel whether there is or not the detections of bias in association, after the motor starts to accelerate to the first rotation speed, during the prescribed period in, a duty ratio is obtained per defined timing, each duty ratio is compared with the duty ratio of last acquirement.Specifically, the count value that initial value is zero is added 1 when the duty ratio of acquirement is more than or equal to the last duty ratio obtained, when the duty ratio of acquirement is less than the last duty ratio obtained, count value is reset into initial value.

Moreover, judging the bias in dehydration barrel there are washings when the count value is more than or equal to defined threshold value, stopping the rotation of dehydration barrel.

As long as the variation occurred between the adjacent duty ratio of monitoring timing always like this, the variation of the initial duty ratio obtained when even if starting relative to detection is small, also it can be carried out the accurate detection for having grasped the variation of duty ratio of detection midway in real time, therefore be able to achieve washings whether there is or not the raisings of the detection accuracy of bias.

In addition, through the invention, the dehydration as dewaterer operates, it is applied to the duty ratio of the voltage for the electric motor for rotating dehydration barrel by controlling, rotates motor with the first rotation speed constant speed, then, makes electricity Machine is rotated with the second rotation speed constant speed higher than the first rotation speed, and thus the washings in dehydration barrel is formally dehydrated.

With the washings in dehydration barrel whether there is or not the detections of bias in association, the rotation speed of motor from the first rotation speed in a period of reaching the second rotation speed, per defined timing obtain a duty ratio.When the duty ratio is more than or equal to defined threshold value, judges the bias in dehydration barrel there are washings, stop the rotation of dehydration barrel.

The dehydration function receives related with the dehydration conditions of washings selection by receiving unit, dehydration conditions can change threshold value based on the received.As a result, due to can be in the operating of the dehydration under each dehydration conditions, washings is detected by the threshold value mutually fitted with each dehydration conditions, and whether there is or not bias, therefore are able to achieve washings whether there is or not the raisings of the detection accuracy of bias.

Furthermore, through the invention, dehydration as dewaterer operates, the duty ratio of the voltage for the electric motor for rotating dehydration barrel is applied to by controlling, rotate motor with the first rotation speed constant speed, then, rotate motor with the second rotation speed constant speed higher than the first rotation speed, thus the washings in dehydration barrel is formally dehydrated.

With the washings in dehydration barrel whether there is or not the detections of bias in association, the maximum value of duty ratio is taken as maximum duty cycle under acceleration mode until motor is accelerated to the first rotation speed, then, the aggregate-value of the difference of the duty ratio of the maximum duty cycle and per stipulated time is calculated.

When the bias of washings is not present in dehydration barrel, after generating maximum duty cycle, even if motor can also accelerate to the first rotation speed, therefore duty ratio is gradually reduced since duty is smaller.As a result, since the difference of duty ratio and maximum duty cycle is gradually increased, aggregate-value increases.But when there are when the bias of washings, due to motor in order to accelerate to the first rotation speed, must also increasing duty ratio after generating maximum duty cycle in dehydration barrel, therefore generates the duty ratio after maximum duty cycle and be not easy to reduce.As a result, since the difference of duty ratio and maximum duty cycle is not easy to increase, aggregate-value is difficult to increase.

Therefore, when aggregate-value is less than defined threshold value, judge the bias in dehydration barrel there are washings, stop the rotation of dehydration barrel.

As long as the opposite new structure that changes of the duty ratio relative to maximum duty cycle after being generated using monitoring maximum duty cycle like this, can be achieved with washings, whether there is or not the raisings of the detection accuracy of bias.

In addition, through the invention, threshold value is by adding 1 primary count value and maximum duty cycle with per stipulated time As variable formula and acquire.Maximum duty cycle is different according to the size of the load of the washings in dehydration barrel.Therefore, strange land is set threshold value due to load.Due to having carried out washings based on optimal threshold value corresponding with the size of the load of the washings in dehydration barrel, whether there is or not the detections of bias as a result, can prevent error detection.It is thereby achieved that washings further increasing whether there is or not the detection accuracy of bias.

In addition, through the invention, duty ratio is set as generating maximum duty cycle in the slightly lower revolving speed of the revolving speed to resonate than dehydration barrel.At this point, resonating early stage after maximum duty cycle generation.Therefore, there is a phenomenon where aggregate-values to be difficult to increase soon.Therefore, early and the bias in dehydration barrel there are washings can be correctly detected out.

Detailed description of the invention

Fig. 1 is the schematic vertical sectional right view for indicating the dewaterer 1 of one embodiment of the present invention.

Fig. 2 is the block diagram for indicating the electric structure of dewaterer 1.

Fig. 3 is the time diagram of the state of the revolving speed of the motor 6 in the dehydration operating for indicating to be implemented with dewaterer 1.

Fig. 4 is the chart for indicating to be contained in the weight of the washings of dehydration barrel 4 of dewaterer 1 with the relationship of the load detected according to the weight of washings by dewaterer 1.

Fig. 5 A is to indicate that whether there is or not the flow charts of the detection 1 of bias~detection 4 summary for detecting the washings in dehydration barrel 4 in dehydration operating.

Fig. 5 B is to indicate that whether there is or not the flow charts of the detection 1 of bias~detection 4 summary for detecting the washings in dehydration barrel 4 in dehydration operating.

Fig. 6 A is the flow chart for indicating the relevant control movement of detection 1 and detection 2.

Fig. 6 B is the flow chart for indicating the relevant control movement of detection 1 and detection 2.

Fig. 7 is the chart for indicating the relationship of the difference Sn of revolving speed and revolving speed of motor 6 in association with detection 1.

Fig. 8 is the revolving speed and the chart of the relationship of the aggregate-value U of the absolute value of the difference about difference S for indicating motor 6 in association with detection 2.

Fig. 9 A is the flow chart for indicating the relevant control movement of detection 3 and detection 4.

Fig. 9 B is the flow chart for indicating the relevant control movement of detection 3 and detection 4.

Figure 10 is the chart for indicating time and the relationship of the first count value E in association with detection 3.

Figure 11 is to indicate the time in association with detection 4 and correct the chart of the relationship of duty ratio dn_diff.

Figure 12 is to indicate that whether there is or not the detection 5-1 of bias and the flow charts for the summary for detecting 5-2 for detecting the washings in dehydration barrel 4 in dehydration operating.

Figure 13 is the flow chart for indicating the relevant control movement of detection 5-1.

Figure 14 is the chart for indicating the relationship of revolving speed and mobile aggregate-value Cn in association with detection 5-1 and detection 5-2.

Figure 15 is the flow chart for indicating the relevant control movement of detection 5-2.

Figure 16 is the flow chart for indicating to detect the control action of foam in dehydration operating.

Figure 17 is the time diagram with the state of the revolving speed of the motor 6 of the midway of the dehydration operating that expression dewaterer 1 is implemented in association of detection 6.

Figure 18 is the flow chart for indicating the relevant control movement of detection 6.

Figure 19 is the chart for indicating the relationship of count value G and aggregate-value H in association with detection 6.

Figure 20 is the chart for indicating the relationship of count value G and duty ratio in association with detection 6.

Description of symbols

1: dewaterer；4: dehydration barrel；6: motor；30: control unit；Dg: duty ratio；Dmax: maximum duty cycle；Dn: duty ratio；D0: reference duty cycle；Dn_diff: correction duty ratio；E: the first count value；G: count value；H: aggregate-value；Q: washings.

Specific embodiment

Hereinafter, embodiments of the present invention are specifically described referring to attached drawing.

Fig. 1 is the schematic vertical sectional right view of the dewaterer 1 of one embodiment of the present invention.

The up and down direction of Fig. 1 is known as to the up and down direction X of dewaterer 1, the left and right directions of Fig. 1 is known as to the front-rear direction Y of dewaterer 1, firstly, being illustrated to the summary of dewaterer 1.In up and down direction X, top is known as top X1, lower section is known as lower section X2.In front-rear direction Y, the left in Fig. 1 is known as Right in Fig. 1 is known as rear Y2 by front Y1.

Dewaterer 1 includes the device of all dehydration operatings that can be carried out washings Q.Therefore, dewaterer 1 not only includes device only with dehydrating function, further includes the washing machine with dehydrating function, clothes washer-dryer.Hereinafter, being illustrated by taking washing machine as an example to dewaterer 1.

Dewaterer 1 includes casing 2, outer barrel 3, dehydration barrel 4, rotary wings 5, electric motor 6 and transmission mechanism 7.

Casing 2 is, for example, made of metal, is formed as box-like.The upper surface 2A of casing 2 is formed obliquely in a manner of as X1 extends towards rear Y2 and upwards relative to front-rear direction Y.In upper surface, 2A is formed with the inside and outside opening 8 of connection casing 2.In upper surface, 2A is equipped with the door 9 that opening 8 is opened and closed.In upper surface 2A, in the region than 8 Y1 closer to the front that are open, equipped with the operation portion 20 being made of liquid crystal operation panel etc..User by operating the operating department 20, unrestricted choice dehydration conditions or can indicate that operation start, operating stop etc. to dewaterer 1.

Outer barrel 3 is for example made of resin, and is formed as bottomed cylindrical.Outer barrel 3 has: substantially cylindric circumferential wall 3A is configured along up and down direction X；Bottom wall 3B, X2 blocks the hollow space of circumferential wall 3A from below；And cricoid annular wall 3C, it is stretched out by the ora terminalis bound edge of the top side X1 of circumferential wall 3A and to the center of circle side of circumferential wall 3A.The entrance 10 of the hollow space from top X1 connection circumferential wall 3A is formed on the inside of annular wall 3C.Entrance 10 from below X2 relative to casing 2 opening 8 in it is opposed and be connected to state.The door 11 that entrance 10 is opened and closed is equipped in annular wall 3C.Bottom wall 3B, which is shaped generally as, to be horizontally extended disk-shaped, in the center location of bottom wall 3B, is formed with the through hole 3D of perforation bottom wall 3B.

It can water storage in outer barrel 3.Outer barrel 3 is connected with the water route 12 being connected with the tap of tap water from top X1, and tap water is supplied in outer barrel 3 from water route 12.It is equipped with and is opened and closed to start or stop the feed water valve 13 of water supply in the midway of water route 12.X2 is connected with draining road 14 to outer barrel 3 from below, and the water in outer barrel 3 is discharged to outside washing machine from draining road 14.It is equipped with and is opened and closed to start or stop the drain valve 15 of draining in the midway on draining road 14.

Dehydration barrel 4 is, for example, made of metal, is formed as the bottomed cylindrical enclosed than outer barrel 3 small one, can accommodate washings Q in inside.With the substantially cylindric circumferential wall 4A configured along up and down direction X and from below, X2 blocks the bottom wall 4B of the hollow space of circumferential wall 4A to dehydration barrel 4.

The inner peripheral surface of circumferential wall 4A is the inner peripheral surface of dehydration barrel 4.The inner peripheral surface of circumferential wall 4A it is upper End is the hollow space entrance 21 that X1 exposes upwards for making circumferential wall 4A.Entrance 21 from below X2 relative to outer barrel 3 entrance 10 in it is opposed and be connected to state.Entrance 10 and 21 is opened and closed together by door 11.Washings Q taking-up is put into dehydration barrel 4 via open opening 8, entrance 10 and 21 by the user of dewaterer 1.

Dehydration barrel 4 is coaxially contained in outer barrel 3.Dehydration barrel 4 in the state of being contained in outer barrel 3 can be pivoted about with constituting the axis extended in central shaft and in above-below direction X 16.In addition, the circumferential wall 4A and bottom wall 4B of dehydration barrel 4 are formed with multiple through holes (not shown), the water energy in outer barrel 3 is come and gone between outer barrel 3 and dehydration barrel 4 via the through hole.Therefore, the water level in outer barrel 3 is consistent with the water level in dehydration barrel 4.

The bottom wall 4B of dehydration barrel 4 relative to outer barrel 3 bottom wall 3B upwards X1 interval and being shaped generally as extend parallel to it is disk-shaped, in bottom wall 4B, in the consistent center location of axis 16, be formed with the through hole 4C of perforation bottom wall 4B.Bottom wall 4B, which is equipped with, surrounds through hole 4C and along the support shaft 17 of the tubulose that X2 extends downwards of axis 16.Support shaft 17 inserts the through hole 3D of the bottom wall 3B of outer barrel 3, and the lower end of support shaft 17 is at than bottom wall 3B more on the lower X2.

The namely impeller of rotary wings 5 is formed as with axis 16 concentrically configuring in dehydration barrel 4 along bottom wall 4B and dehydration barrel 4 for the discoid of the center of circle.In rotary wings 5, in the upper surface of the entrance 21 towards dehydration barrel 4, multiple blade 5A equipped with radial configuration.Rotary wings 5 are equipped with from its center of circle along the rotary shaft 18 that X2 extends downwards of axis 16.Rotary shaft 18 inserts the hollow space of support shaft 17, and the lower end of rotary shaft 18 is at the bottom wall 3B than outer barrel 3 more on the lower X2.

In the present embodiment, motor 6 is realized by variable-frequency motor.Motor 6 is configured at the lower section X2 of outer barrel 3 in casing 2.Motor 6 has the output shaft 19 pivoted about with axis 16.Transmission mechanism 7 is between support shaft 17 and the respective lower end of rotary shaft 18 and the upper end of output shaft 19.The driving force that motor 6 is exported from output shaft 19 is selectively passed to one or both of support shaft 17 and rotary shaft 18 by transmission mechanism 7.Well known transmission mechanism can be used as transmission mechanism 7.

When the driving force of motor 6 is transmitted to support shaft 17 and rotary shaft 18, dehydration barrel 4 and rotary wings 5 are rotated around axis 16.In washing operating and rinsing operating, the blade 5A stirring of dehydration barrel 4 and rotary wings 5 that the washings Q in dehydration barrel 4 is rotated.In addition, in the dehydration operating after rinsing operating, by dehydration barrel 4 and rotary wings 5 integrally high speed rotation, the washings Q in dehydration barrel 4 is dehydrated.

Referring to Fig. 2, dewaterer 1 includes: load determination unit, drive control unit, acquisition unit, timing determination unit, judging unit, stop control unit, execution unit, counting unit, receiving unit, threshold value changing unit and the control unit 30 as computing unit.Control unit 30 is configured to the microcomputer for example including the memories such as CPU31, ROM or RAM 32, timer 35 and counter 36, is built in casing 2 (referring to Fig.1).

Dewaterer 1 further includes water level sensor 33 and revolving speed reading device 34.Water level sensor 33 and revolving speed reading device 34 and above-mentioned motor 6, transmission mechanism 7, feed water valve 13, drain valve 15 and operation portion 20 are electrically connected with control unit 30 respectively.

Water level sensor 33 is the sensor for detecting the water level of outer barrel 3 and dehydration barrel 4, the real-time input control portion 30 of the testing result of water level sensor 33.

Revolving speed reading device 34 is the rotation speed for reading motor 6, strictly speaking reads the device of the revolving speed of the output shaft 19 of motor 6, is made of such as Hall IC.The real-time input control portion 30 of revolving speed that revolving speed reading device 34 is read.Control unit 30 is applied to the duty ratio of the voltage of motor 6 by the revolving speed control based on input, makes motor 6 with the rotation of desired revolving speed.

The transmitting target of the driving force of motor 6 is switched to one or both of support shaft 17 and rotary shaft 18 by control transmission mechanism 7 by control unit 30.Control unit 30 controls the opening and closing of feed water valve 13 and drain valve 15.As described above, control unit 30 receives the selection when user operates dehydration conditions etc. of the operation portion 20 to select washings Q.

Next, being illustrated to the dehydration operating that dewaterer 1 carries out.

Fig. 3 is the time diagram of the state of the revolving speed of motor 6 in the dehydration operating for indicating to be implemented by dewaterer 1.In the time diagram of Fig. 3, horizontal axis indicates to pass through the time, and the longitudinal axis indicates the revolving speed (unit: rpm) of motor 6.

Referring to Fig. 3, in dehydration operating, the load of washings Q of the control unit 30 when dehydration barrel 4 starts rotation in measurement dehydration barrel 4.After determining load, control unit 30 makes motor 6 with the rotation of 120rpm constant speed after making the rotation speed of motor 6 rise to this fixing speed of 120rpm.Then, control unit 30 makes motor 6 with the rotation of 240rpm constant speed after making motor 6 rise to this first rotation speed of 240rpm from 120rpm.Then, control unit 30 makes motor 6 with the rotation of 800rpm constant speed after making motor 6 rise to this second rotation speed of 800rpm from 240rpm.It is rotated by motor 6 with 800rpm constant speed, Washings Q in dehydration barrel 4 is formally dehydrated.It should be noted that, when the rotation speed of motor 6 is such as 50rpm~60rpm, lateral resonance occurs for dehydration barrel 4 when being dehydrated operating, when the rotation speed of motor 6 is such as 200rpm~220rpm, longitudinal resonance occurs for dehydration barrel 4.

When the washings Q in dehydration barrel 4 is in the state for the circumferencial direction that bias is configured at dehydration barrel 4, there are the bias of washings Q in dehydration barrel 4.When carrying out dehydration operating in this state, dehydration barrel 4 is eccentrically rotated, and dehydration barrel 4 is possible to substantially swing as a result, assigns the biggish vibration of dewaterer 1, generates noise.

Therefore, whether there is or not bias by washings Q of the control unit 30 in the midway of dehydration operating, detection dehydration barrel 4, when detecting the presence of bias, stop motor 6.As such detection, control unit 30 executes detection 1, detection 2,5 this five kinds of electro-detections of detection 3, detection 4 and detection.

Detection 1~detection 4 executes in low speed eccentricity detecting section, which was made of the specified time limit after accelerating acceleration period of the rotation speed of motor 6 until 120rpm rises to 240rpm and motor 6 to 240rpm.Detection 5 executes in high speed eccentricity detecting section during reaching 800rpm in the rotation speed of motor 6 from 240rpm.

Fig. 4 be indicate to be contained in the washings Q of dehydration barrel 4 weight and load relationship chart, which is detected according to the weight of washings Q by dewaterer 1.In the graph in fig. 4, horizontal axis indicates the weight (unit: kg) of washings Q, and the longitudinal axis indicates the detected value of load.

Referring to Fig. 4, as described above, control unit 30 measures the load of the washings Q in dehydration barrel 4 when dehydration barrel 4 starts rotation.Control unit 30 rotates dehydration barrel 4 with egulation rotating speed when dehydration barrel 4 starts rotation, and the value for carrying out obtaining after certain number is accumulative to the duty ratio for the voltage for being applied to motor 6 at this time is detected as load.When washings Q becomes weight, due to that must apply high voltage to motor 6 so that dehydration barrel 4 rotates, as voltage increases, load becomes larger.In this way, control unit 30 carries out electrical measurement to the load of washings Q.

Fig. 5 A and Fig. 5 B are the flow charts for indicating detection 1~detection 4 summary.

Referring to Fig. 5 A and Fig. 5 B, when starting the dehydration rotation of dehydration barrel 4 and starting dehydration operating (step S1), as described above, control unit 30 measures the load (step S2) of the washings Q in dehydration barrel 4, then, motor 6 is made to rotate stipulated time (step S3) with 120rpm constant speed.

Then, control unit 30 starts motor 6 accelerating (step S4) to 240rpm, in the acceleration of motor 6 Period implements above-mentioned detection 1 (step S5).In the case where the result of detection 1 is not " OK " (step S5: no), that is, in the judgement of control unit 30, there are in the case where the bias of washings Q, control unit 30 stops motor 6, the rotation of dehydration barrel 4 is set to stop (step S6), Next, it is determined whether dehydration operating (step S7) can be restarted.

Restarting for dehydration operating refers to control unit 30 after the rotation for stopping dehydration barrel 4 is to stop dehydration operating, makes the rotation of dehydration barrel 4 immediately to restart dehydration operating.It describes after detailed situation, sometimes can also be restarted according to the degree of washings Q bias.

It is not carried out in the case where restarting (step S7: yes) before restarting, (step S8) is restarted in the execution of control unit 30.The duration that the constant speed of 120rpm rotates is shorten to the when length of the constant speed rotation than the 120rpm being dehydrated in operating just stopped by control unit 30 in the dehydration operating restarted.In the case where restarting, since washings Q is in the state for being attached at the inner peripheral surface of dehydration barrel 4 to a certain extent and eliminating most water, even if even the duration that the constant speed for shortening 120rpm rotates.The time for being able to achieve dehydration operating as a result, shortens.It should be noted that such duration shorten can also it is subsequent later respectively restart in execute.

When that can not restart (step S7: no), control unit 30 executes uneven this processing (step S9) of amendment.In imbalance amendment, for control unit 30 by opening feed water valve 13 after closing drain valve 15 and supplying water in dehydration barrel 4 to predetermined water level, the washings Q in dehydration barrel 4, which is immersed in the water, makes it be easy to unclamp.In this state, the washings Q for being attached at the inner peripheral surface of dehydration barrel 4 peeling is stirred by control unit 30 by rotating dehydration barrel 4 and rotary wings 5, thus corrects the bias of the washings Q in dehydration barrel 4.

On the other hand, in the case where the result of detection 1 is " OK " (step S5: yes), that is to say, that in control unit 30, by 1 judgement of detection, there is no when the bias of washings Q, control unit 30 then implements above-mentioned detection 2 (step S10) in the acceleration period of motor 6.

In the case where the result of detection 2 is not " OK " (step S10: no), that is, in the judgement of control unit 30 there are in the case where the bias of washings Q, control unit 30 stops motor 6 and dehydration barrel 4, stops dehydration operating (step S11).Then, control unit 30 confirms whether the dehydration conditions of the dehydration operating specifically stopped are " woolen mode " or " single de- operating (step S12).

Woolen mode refers to the dehydration conditions that the washings Q to the easy water suction such as wool fabric is dehydrated.It is woolen mode (step S12: yes) in dehydration conditions, and the dehydration specifically stopped operates as being not carried out and restart In the case where before restarting (step S13: yes), control unit 30, which is executed, restarts (step S14) for what the duration that 120rpm constant speed rotates shortened.

In the case where woolen mode, the rotation of dehydration barrel 4 can be hindered in a large amount of water in outer barrel 3 by oozing out and putting aside from wool fabric, and the result of the erroneous judgement of the meeting of control unit 30 sometimes detection 2 is not " OK " as a result,.Moreover, when regardless of whether erroneous judgement all carries out uneven amendment, when wool fabric largely absorbs water again, it is possible to can the erroneous judgement again in detection 2 later.Therefore, in the case that the result of judgement detection 2 is not " OK " under woolen mode, (step S13: yes) is restarted as long as being not carried out, and is just corrected without imbalance but is restarted (step S14).On the other hand, before not being to restart, that is to say, that restart (step S13: no) as long as the dehydration operating specifically stopped has had been carried out, control unit 30 is carried out uneven amendment (step S15).

Single de- operating does not refer to the dehydration operating that then washing operating and rinsing operate and execute, and refers to the washings Q that rinsing is completed putting into dehydration barrel 4, the dehydration conditions that washings Q is dehydrated.In the case where before dehydration conditions are single de- operating (step S12: yes) and are to restart (step S13: yes), (step S14) is restarted in the execution of control unit 30.

In the case where singly de- operating, when the washings Q that rinsing is completed is soaked by uneven amendment, the washings Q for preparing that rinsing is completed in advance is with regard to meaningless.Therefore, in the case that the result of judgement detection 2 is not " OK " during singly de- operating, restart as long as being not carried out, restarted without imbalance amendment.It should be noted that control unit 30 can also the display by being carried out by operation portion 20, reporting an error by the progress such as buzzer, prompt user need in dehydration barrel 4 reset washings Q.On the other hand, before not being to restart (step S13: no), control unit 30 executes uneven amendment (step S15).

On the other hand, in dehydration conditions neither in the case that woolen mode is also not single de- operating (step S12: no), control unit 30 judges that the dehydration specifically stopped operates as before restarting, and judges whether next whether can restart (step S16).When restarting (step S17) for what the duration that 120rpm constant speed rotates shortened for before restarting and when can restart (step S16: yes), control unit 30 is executed.When being unsatisfactory for before restarting and can restart this condition (step S16: no), control unit 30 executes uneven amendment (step S18).

And, in the case where the result of detection 2 is " OK " (step S10: yes), that is, detecting judgement in 2, there is no in the case where the bias of washings Q, control unit 30 confirms whether the value of timer 35 is the setting value of every load or more (step S19) to control unit 30.That is, to confirm whether the time of measuring of timer 35 has reached in step S19 negative with the washings Q in dehydration barrel 4 for control unit 30 The corresponding setting value of lotus amount.It is described further below about setting value.

When more than the setting value that the value of timer 35 is every load (step S19: yes), in the state that motor 6 is with the rotation of 240rpm constant speed, control unit 30 implements above-mentioned 4 (step S20) of detection 3 and detection.In the case where detecting the result of 3 and detection 4 and not being " OK " (step S20: no), i.e., in the judgement of control unit 30, there are in the case where the bias of washings Q, control unit 30 stops motor 6 and dehydration barrel 4, stop dehydration operating (step S11), executes respective handling in step S12~S18.

On the other hand, in the case where detecting the result of 3 and detection 4 and being " OK " (step S20: yes), that is, there is no in the case where the bias of washings Q for judgement in detecting 3 and detection 4 for control unit 30, control unit 30 then makes motor 6 with the rotation of 240rpm constant speed, continues the dehydration (step S21) under 240rpm.

Next, detection 1~detection 4 is described in detail respectively.

Fig. 6 A and Fig. 6 B are the flow charts for indicating the relevant control movement of detection 1 and detection 2.Firstly, being illustrated referring to Fig. 6 A and Fig. 6 B to detection 1 and detection 2.Detection 1 and detection 2 be using motor 6 rotation speed progress washings Q whether there is or not the detections of bias.

Control unit 30 starts to accelerate motor 6 to 240rpm, starts detection 1 and detection 2 in above-mentioned step S4.Firstly, control unit 30, which starts timer 35, starts timing, and the revolving speed V0 (step S31) of motor 6 when accelerating to start is measured by revolving speed reading device 34.Revolving speed V0 is 120rpm or so.

Value about timer 35, that is to say, that about timing, the acceleration duration that detection time, that is, motor 6 of detection 1 and detection 2 accelerates to 240rpm is different because of load.The reason is that the amount of washings Q is more, the rotation speed of motor 6 reaches 240rpm and more takes time.Therefore, the setting value of every load related with the acceleration duration of motor 6 is acquired in advance by experiment etc., and is stored in memory 32.

Then, control unit 30 starts counting (step S32) by counter 36, by every 0.3 second initialization start-stop counter 36, so that every 0.3 second is once counted (step S33 and step S34).

Control unit 30 counts the revolving speed Vn (n: count value) (step S35) of motor 6 when all measurements are primary to be counted every time.Control unit 30 in step s 35, calculates the difference Sn of the revolving speed Vn measured with the revolving speed Vn-1 once measured before Vn.In turn, control unit 30 calculates its aggregate-value U also in step s 35 with regard to the absolute value of difference Sn and the difference of a upper difference Sn-1.

Then, control unit 30 confirms whether the value of timer 35 has reached the setting value of every load or more, That is, the time of measuring of confirmation timer 35 is no to reach setting value (step S36) corresponding with the load of washings Q in dehydration barrel 4.Step S36 is equivalent to above-mentioned step S19 (referring to Fig. 5 A).

In the case where the value of timer 35 is lower than the setting value of every load, that is, in the case where the timing of timer 35 is not up to corresponding setting value (step S36: no), when the load of the washings Q in dehydration barrel 4 is a certain amount of following (step S37: yes), whether calculated difference Sn falls into the range of detection 1 (step S38) judgement of control unit 30 just now.This is a certain amount of to be acquired in advance by testing etc., and is stored in memory 32.

Specifically, difference Sn has preset threshold value and has been stored in memory 32.Fig. 7 is the chart for indicating the relationship of revolving speed and difference Sn of motor 6 in association with detection 1.In the graph in figure 7, horizontal axis indicates revolving speed (unit: rpm), and the longitudinal axis indicates difference Sn (unit: rpm).

Referring to the range of the revolving speed indicated in Fig. 7 with dotted arrow, it is considered as in small eccentricity there is no in the case where the bias of washings Q, due to the acceleration for stabilization of dehydration barrel 4, as shown by the solid line, the deviation of difference Sn is small.But eccentric larger and be considered as there are in the case where the bias of washings Q, shown in dotted line since the acceleration of dehydration barrel 4 is unstable, the deviation of difference Sn is big, and the minimum value of difference Sn is lower than threshold value.Therefore, Fig. 6 A is returned to, when difference Sn is less than or equal to threshold value, control unit 30 judges that difference Sn is fallen into the range of detection 1 (step S38: yes).Like this, in detection 1, expression washings Q is detected based on difference Sn, and whether there is or not the unstable degree of the acceleration of the dehydration barrel 4 of bias.

When control unit 30 judges that difference Sn is fallen into the range of detection 1 (step S38: yes), stop the rotation (the step S6) of motor 6, execute the respective handling in above-mentioned step S7~S9 (referring to Fig. 5 A).Step S31~step S38 processing includes in above-mentioned step S5 (referring to Fig. 5 A).

When control unit 30 is higher than threshold value by difference Sn to judge it without falling into when detecting in the range of 1 (step S38: no), whether calculated aggregate-value U is fallen into the range of detection 2 (step S39) just now for judgement.

In addition, control unit 30 does not execute the judgement carried out by detection 1 in step S38, and executes the judgement carried out by detection 2 in step S39 when the load of the washings Q in dehydration barrel 4 is more than a certain amount of (step S37: no).The reason is that the amount in washings Q arrives greatly more than in a certain amount of situation, since more than the water oozed out from washings Q or the bias of washings Q change dramatically due to washings Q is attached at the inner peripheral surface of dehydration barrel 4 suddenly, it is therefore possible to can not steadily execute detection 1.Therefore, in the case where the amount of washings Q is more than a certain amount of situation, detection 1 is omitted.

To judge aggregate-value U whether fall into detection 2 in the range of related, aggregate-value U has preset threshold value and has been stored in memory 32.Fig. 8 is the chart for indicating the relationship of revolving speed and aggregate-value U of motor 6 in association with detection 2.In the chart of Fig. 8, horizontal axis indicates time (unit: sec), and the longitudinal axis indicates aggregate-value U (unit: rpm).Referring to Fig. 8, upside threshold value both threshold values that threshold value sets the downside threshold value that useful cardinal points indicate and indicated with triangulation point.Upside threshold value is the value higher than downside threshold value.

In the case where the eccentric small bias that washings Q may be not present, due to the acceleration for stabilization of dehydration barrel 4, as shown by the solid line, aggregate-value U is below downside threshold value in any timing.But eccentric greatly and there are in the case where the bias of washings Q, shown in dotted line since the acceleration of dehydration barrel 4 is unstable, aggregate-value U is higher than downside threshold value in any timing.When the bias of washings Q is big, aggregate-value U is higher than upside threshold value.Therefore, Fig. 6 A is returned to, when aggregate-value U is more than or equal to downside threshold value, control unit 30 judges that aggregate-value U is fallen into the range of detection 2 (step S39: yes).Like this, detection 2 detected based on aggregate-value U indicate washings Q whether there is or not the unstable degree of the acceleration of the dehydration barrel 4 of bias.

When control unit 30 judges that aggregate-value U is fallen into the range of detection 2 (step S39: yes), stops the rotation (the step S11) of motor 6, execute the respective handling in above-mentioned step S12~S18.The processing of step S31~S37 and step S39 is included in above-mentioned step S10 (referring to Fig. 5 A).

In dehydration conditions neither in the case that woolen mode is also not single de- operating (step S12: no), control unit 30 in step s 16, judges whether the bias of washings Q arrives greatly aggregate-value U and restart for whether the dehydration operating more than upside threshold value or specifically stopped has been carried out.

It is (step S16: yes) in the case that upside threshold value or more or have been carried out is restarted in aggregate-value U, control unit 30 executes uneven amendment (step S18).In the case where aggregate-value U is less than upside threshold value and is not restarted (step S16: no), (step S17) is restarted in the execution of control unit 30.Whether aggregate-value U is that can the judgement of upside threshold value or more be equivalent to the judgement that restart in the step S16 of Fig. 5 B, if whether it is judgement before restarting that the judgement restarted is equivalent in the step S16 of Fig. 5 B.

So, control unit 30 is in step S16~S18, judge that the bias in the range of detection 2 is small enough to next to can be carried out the degree restarted or big to needing to carry out uneven modified degree based on whether aggregate-value U is upside threshold value or more, and is executed according to the selection of the size of bias and to restart and uneven correct.

Moreover, when the value of timer 35 reaches the setting value of every load (step S36: yes), control unit 30 terminates detection in the state that all the bias of washings Q is not present in judgement in detecting 1 and detection 2 1 and 2 (step S40) of detection.In addition, control unit 30 is in step s 40, the duty ratio that the time point for reaching setting value in the value of timer 35 is applied to the voltage of motor 6 is taken as reference duty cycle d0.The value of timer 35 reach setting value and execute step S40 processing time point, motor 6 is in the acceleration mode accelerated to until 240rpm.

As described above, the setting value in step S36 is different because of the load of the washings Q in dehydration barrel 4.Therefore, control unit 30 determines the timing for obtaining reference duty cycle d0 in step s 40 according to the load measured when the dehydration of dehydration barrel 4 rotates.In other words, control unit 30 is changed according to timing of the load to detection 3 and detection 4 after terminating detection 1 and detection 2 and starting.Therefore, detection 3 and detection 4 can be executed in best timing corresponding with the amount of washings Q.

Fig. 9 A and Fig. 9 B are the flow charts for indicating the relevant control movement of detection 3 and detection 4.Detection 3 and detection 4 are illustrated referring to Fig. 9 A and Fig. 9 B.Detection 3 and detection 4 be utilized the voltage for being applied to motor 6 duty ratio carry out washings Q whether there is or not the detections of bias.

Control unit 30 obtains reference duty cycle d0 in above-mentioned step S40, starts detection 3 and detection 4.When starting detection 3 and detection 4, the rotation speed of motor 6 is in the state for having reached 240rpm, and motor 6 is with the rotation of 240rpm constant speed.

Relatively with detection 3 and detection 4, there are the first count value E and the second count value T, are stored in memory 32.First count value E and the second count value T are reset to initial value 0 (zero) (step S41) when starting detection 3 and detection 4 by control unit 30 respectively.

Then, control unit 30 starts timer 35, starts timing (step S42), and whether the value of watchdog timer 35 is more than 8.1 seconds.Third detection and the 4th detection are executed in 8.1 seconds this specified time limits after reference duty cycle d0 obtaining.

In addition, control unit 30 is started counting in step S42 by counter 36, by every 0.3 second initialization start-stop counter 36, so that every 0.3 second is once counted (step S43 and step S44).Control unit 30 is in step S44, and in the timing of initialization counter 36, i.e., the second count value T is added 1 (+1) by the timing counted every time.

Control unit 30 obtains the duty ratio dn (n: count value) (step S45) of the voltage once applied when counting to motor 6 in each count.That is, control unit 30, within 8.1 seconds above-mentioned this specified time limits, this defined timing in every 0.3 second obtains a duty ratio dn.

In addition, control unit 30 in step S45, is based on formula below (1) and (2), operation is carried out to the correction duty ratio dn_diff of every timing in 0.3 second.Correction duty ratio dn_diff is the value that the duty ratio dn obtained to same timing is corrected, precisely to execute the detection in detection 4.In addition, formula (1) and A in (2) and B are by the constant found out such as testing.

Dn_diff=A × dn-dn_x ... formula (1)

Dn_x=(A × d0)-(B × T) ... formula (2)

Then, when the duty ratio dn of acquirement is more than or equal in the duty ratio dn-1 that upper primary timing obtains (step S46: yes), the first count value E is added 1 (+1) (step S47) by control unit 30.In turn, in third detection, the duty ratio dn that control unit 30 initially obtains is above-mentioned reference duty cycle d0.On the other hand, when the duty ratio dn of acquirement is lower than in the duty ratio dn-1 that upper primary timing obtains (step S46: no), the first count value E is reset to initial value 0 (zero) (step S48) by control unit 30.

Then, control unit 30 confirms whether the value of timer 35 is 8.1 seconds hereinafter, whether the time of measuring of i.e. timer 35 has been more than 8.1 seconds (step S49).

It is (step S49: yes) in 8.1 seconds situations below in the value of timer 35, when the load of the washings Q in dehydration barrel 4 is more than a certain amount of (step S50: yes), control unit 30 judges whether newest first count value E falls into the range of detection 3 (step S51).This is a certain amount of to be found out in advance by testing etc., and is stored in memory 32.

Specifically, the first count value E has preset threshold value, and is stored in memory 32.Figure 10 is the chart for indicating time and the relationship of the first count value E in association with detection 3.In the chart of Figure 10, horizontal axis indicates time (unit: sec), and the longitudinal axis indicates the first count value E.Referring to Fig.1 0, upside threshold value both threshold values that threshold value sets the downside threshold value that useful single dotted broken line indicates and indicated with double dot dash line.Upside threshold value and downside threshold value are all unrelated with by the time, for fixed value.Upside threshold value is the value higher than downside threshold value.

In the case where the eccentric small bias that washings Q may be not present, even if motor 6 can also be rotated with 240rpm constant speed, therefore duty ratio dn is gradually reduced since voltage is small.The first count value E is as shown by the solid line as a result, stablizes near initial value 0 (zero).

But eccentric greatly and there are in the case where the bias of washings Q, due to needing high voltage in order to which the rotation speed of motor 6 is maintained 240rpm, duty ratio dn does not reduce.The first count value E does not return to initial value but increases as a result, and shown in dotted line, a timing in office is all higher than downside threshold value.Work as washing When the bias of object Q is big, the first count value E can also be higher than upside threshold value.

Therefore, Fig. 9 A is returned to, when newest first count value E is more than or equal to downside threshold value, control unit 30 judges that the first count value E is fallen into the range of detection 3 (step S51: yes).That is, control unit 30 judges that there are the bias of washings Q in dehydration barrel 4 when the first count value E is more than or equal to defined threshold value within 8.1 seconds above-mentioned this specified time limits.

As long as monitoring the structure of the variation between the adjacent duty ratio dn of timing always as detection 3, the variation of the initial i.e. reference duty cycle d0 of duty ratio dn obtained when even if starting relative to detection is small, also can be carried out the accurate detection for having grasped the variation of duty ratio dn of detection midway in real time.Being able to achieve washings Q as a result, whether there is or not the raisings of the detection accuracy of bias.

Then, when control unit 30 lower than downside threshold value by the range of judging the first count value E without falling into detection 3 (step S51: no), judge whether the correction duty ratio dn_diff calculated just now falls into the range of detection 4 (step S52).

In addition, control unit 30 does not execute the judgements carried out by detection 3 in step S51, and executes the judgements carried out by detection 4 in step S52 when the load of the washings Q in dehydration barrel 4 is lower than a certain amount of (step S50: no).The reason is that the first count value E is unstable in earlier stage convergence due to duty ratio dn, it is possible to can not can steadily execute detection 3 when executing detection 3 under the amount of washings Q is arrived less lower than a certain amount of situation.Therefore, detection 3 is omitted lower than in a certain amount of situation in the amount of washings Q.

The judgement in the range of detection 4 whether is fallen into about correction duty ratio dn_diff, correction duty ratio dn_diff has preset threshold value and has been stored in memory 32.Figure 11 is to indicate the time in association with detection 4 and correct the chart of the relationship of duty ratio dn_diff.In the chart of Figure 11, horizontal axis indicates time (unit: sec), and the longitudinal axis indicates correction duty ratio dn_diff.Referring to Fig.1 1, upside threshold value both threshold values that threshold value sets the downside threshold value that useful single dotted broken line indicates and indicated with double dot dash line.Upside threshold value and downside threshold value are gradually increased with by the time respectively.Upside threshold value is the value higher than downside threshold value.

In the case where the eccentric small bias that washings Q may be not present, even if motor 6 can also be rotated since voltage is small with 240rpm constant speed, therefore correction duty ratio dn_diff is as shown by the solid line, lower than downside threshold value and is gradually reduced.

But, in order to which the rotation speed of motor 6 is maintained 240rpm, high voltage is needed greatly and there are in the case where the bias of washings Q eccentric, therefore correction duty ratio dn_diff is shown in dotted line, will not reduce And it can be more than downside threshold value.When the bias of washings Q is big, correction duty ratio dn_diff may also exceed upside threshold value.Therefore, Fig. 9 A is returned to, when correcting duty ratio dn_diff is downside threshold value or more, the judgement correction of control unit 30 duty ratio dn_diff is fallen into the range of detection 4 (step S52: yes).

It should be noted that in the case that the correction duty ratio dn_diff acquired by above-mentioned formula (1) and (2) is set to identical in duty ratio dn with reference duty cycle d0 or bigger than reference duty cycle d0, the value that increases as time goes by.Therefore, correction duty ratio dn_diff is only in the case where duty ratio dn normally declines relative to reference duty cycle d0 without falling into threshold value.

As above, for detect 3 the first count value E and refer within 8.1 seconds above-mentioned this specified time limits for detecting 4 correction duty ratio dn_diff, be applied to the index the case where duty ratio dn of the voltage of motor 6 changes relative to reference duty cycle d0 to maintain 240rpm.Control unit 30 is in detection 3 and detection 4, and judging the washings Q in dehydration barrel 4 based on such index, whether there is or not bias.

Further, since for detect 3 the first count value E and the correction duty ratio dn_diff for detecting 4 is acquired according to reference duty cycle d0, thus reference duty cycle d0 for left and right washings Q whether there is or not the detection accuracy of bias an important factor for.In dewaterer 1, as described above, control unit 30 measures the load (the step S2 of Fig. 5 A) of the washings Q in dehydration barrel 4 when dehydration barrel 4 starts rotation, and the timing (the step S36 of Fig. 6 A) for obtaining reference duty cycle d0 is determined according to the load measured.It is obtained as a result, due to reference duty cycle d0 in the timing appropriate of the influence in view of load, can be according to reference duty cycle d0, in detection 3 and detection 4 precisely executing washings Q, whether there is or not the detections of bias.As a result, being able to achieve washings Q, whether there is or not the raisings of the detection accuracy of bias.

And, when when control unit 30 judges that the first count value E is fallen into the range of detection 3, (step S51: yes) or judgement correction duty ratio dn_diff are fallen into the range of detecting 4 (step S52: yes), the rotation (the step S11) for stopping motor 6, executes and handles accordingly in above-mentioned step S12~S18.The processing of step S40~S52 includes in above-mentioned step S20 (referring to Fig. 5 A).

Step S16A and step S16B in Fig. 9 B include in above-mentioned step S16 (referring to Fig. 5 B).Specifically, whether it is this judgement before restarting that the judgement in step S16A is equivalent in the step S16 of Fig. 5 B, can the judgement in step S16B is equivalent in the step S16 of Fig. 5 B restart this judgement.

In dehydration conditions neither in the case that woolen mode is also not single de- operating (step S12: no), control unit 30 judges whether the dehydration specifically stopped operating is before restarting in step S16A.When being judged as When restarting preceding (step S16A: yes), control unit 30 judges the whether small degree that respective upside threshold value is both less than to the first count value E and correction duty ratio dn_diff of the bias of washings Q.

For (step S16A: yes) and the first count value E before restarting and correction duty ratio dn_diff lower than respective upside threshold value (step S16B: yes), (step S17) is restarted in the execution of control unit 30.

Not for be completed before restarting restart in the case where (step S16A: no), control unit 30 executes uneven amendment (step S18).Furthermore, even if before restarting (step S16A: yes), in the first count value E and in the case that at least any one is respective upside threshold value or more (step S16B: no) of correction duty ratio dn_diff, control unit 30 executes uneven amendment (step S18).

In this way, in the case that control unit 30 stopped the rotation of dehydration barrel 4 in step s 11, in step S16B~S18, judge that the bias in the range of falling into detection 3, detecting 4 is small enough to the degree that can then restart or greatly to the uneven modified degree of needs progress according to the first count value E and correction duty ratio dn_diff.

That is, control unit 30 is according to the first count value E and corrects the degree of duty ratio dn_diff, in other words whether it is more than or equal to respective upside threshold value according to these values, selects an execution and restart and uneven amendment.Therefore, when there are when the bias of washings Q, be not necessarily intended to execute uneven amendment without exception for judgement.Therefore, when the first count value E and correction duty ratio dn_diff are the value for indicating that the bias of washings Q is small, restarted by being immediately performed, the time for being able to achieve dehydration operating shortens.

Also, in the state of detecting 3 and detection 4 all judges that the bias of washings Q is not present, when the value of timer 35 have passed through 8.1 seconds (step S49: no), control unit 30 terminates 4 (step S53) of detection 3 and detection.

Next, detection 5 is described in detail.Specifically, 5 points of detection are detection 5-1 and detection 5-2.Figure 12 is the flow chart for the summary for indicating detection 5-1 and detecting 5-2.The washings Q of duty ratio is utilized in detection 5-1 and while detecting 5-2, and whether there is or not the detections of bias.

Referring to Fig.1 2, after detecting 3 and detection 4, motor 6 also continues constant speed with the revolving speed of 240rpm and rotates the stipulated time.As the stipulated time expires, motor 6 is accelerated to this rotating speed of target (step S60) of above-mentioned 800rpm from 240rpm by control unit 30.

In the state that motor 6 is accelerated, when the rotation speed of motor 6 reaches 300rpm, the duty ratio of the voltage applied at the time point to motor 6 is taken as α value (step S61) by control unit 30.300rpm is de- The state of the non-water storage of bucket 4 and the revolving speed least influenced by the bias of dehydration barrel 4.Therefore, the α value of 300rpm is the duty ratio in the state of least only being influenced by the load of washings Q by eccentric influenced of dehydration barrel 4.

Then, control unit 30 is in the state that motor 6 continues acceleration, during revolving speed is from 600pm to 729rpm, implements above-mentioned detection 5-1 (step S62).In the case where detecting the result of 6-1 and not being " OK " (step S62: no), i.e., judges that control unit 30 stops motor 6 there are in the case where the bias of washings Q in control unit 30, stop the rotation (step S63) of dehydration barrel 4.In this way, after dehydration operating stops, control unit 30 judges whether it is restart before, that is to say, that whether the dehydration operating that judgement specifically stops has executed and restarts (step S64).

When to restart preceding (step S64: yes), (step S65) is restarted in the execution of control unit 30.When not being to restart preceding (step S64: no), control unit 30 executes uneven amendment (step S66).

On the other hand, in the case where detecting the result of 5-1 and being " OK " (step S62: yes), that is, there is no in the case where the bias of washings Q, control unit 30 then implements above-mentioned detection 5-2 (step S67) in the state that motor 6 continues and accelerates from 730rpm to control unit 30 for judgement in detecting 5-1.

In the case where detecting the result of 5-2 and being " OK " (step S67: yes), that is, there is no in the case where the bias of washings Q for judgement in detecting 5-2 for control unit 30, control unit 30 passes through after making motor 6 accelerate to rotating speed of target (800rpm), make motor 6 with the rotation of rotating speed of target constant speed, to continue the dehydration (step S68) of washings Q.

On the other hand, in the case where detecting the result of 5-2 and not being " QK " (step S67: no), that is, in the judgement of control unit 30, there are in the case where the bias of washings Q, control unit 30 continues the dehydration (step S69) of washings Q by rotating motor 6 with above-mentioned rotating speed of target rotation speed constant speed below.

Next, detection 5-1 and detection 5-2 are described in detail respectively.

Referring to Fig.1 3, control unit 30 starts to detect 5-1 (step S70) in the state of having crossed above-mentioned step S61 (referring to Fig.1 2) and then accelerate motor 6, as the revolving speed of motor 6 reaches 600rpm.

Then, control unit 30 starts counting (step S71) by counter 36, by every 0.3 second initialization start-stop counter 36, so that every 0.3 second is once counted (step S72 and step S73).

Control unit 30 counts the revolving speed of the motor 6 when all obtaining primary count and the duty ratio dn (n: count value) (step S74) of the voltage applied when counting to motor 6 every time.That is, control unit 30 the rotation speed of motor 6 from 240rpm in a period of reaching 800rpm, per defined timing obtain a motor 6 revolving speed and duty ratio dn.

In addition, control unit 30 is in step S74, it is based on formula below (3), operation is corrected with above-mentioned α value to duty ratio dn and the corrected value Bn that obtains.It should be noted that the X and Y in formula (3) are the constant found out by experiment etc..Different from the calculating of simple ratio, by changing weighting by formula (3), corrected value Bn obtained from being corrected to duty ratio dn can precisely execute detection 5-1.

Bn=dn- (α × X+Y) ... formula (3)

In addition, control unit 30 calculates the mobile aggregate-value Cn (n: count value) of corrected value Bn in step S74.Mobile aggregate-value Cn (n: count value) is that will add up to resulting value by the continuous 5 corrected value Bn of counting sequence.And, for some moves an aggregate-value Cn and upper mobile aggregate-value Cn-1, the corrected value Bn of front side 4 for constituting 4 corrected value Bn of rear side in 5 corrected value Bn of mobile aggregate-value Cn-1 and constituting 5 corrected value Bn of mobile aggregate-value Cn is respectively identical value.It should be noted that being not limited to above-mentioned 5 to constitute the number of mobile aggregate-value Cn and total corrected value Bn.

Secondly, control unit 30 is based on formula below (4), the threshold value (step S75) of the mobile aggregate-value Cn of operation.

Threshold value=(revolving speed) × a+b... formula (4)

A and b in formula (4) are the constants acquired by experiment etc., and are stored in memory 32.In addition, these constants a and b is different because of the revolving speed of current motor 6, selected dehydration conditions.Therefore, there are multiple values under same rotating speed for threshold value herein.It should be noted that it will be apparent that, threshold value is the value not influenced by above-mentioned α value by formula (4).

Then, control unit 30 confirms whether the revolving speed of current motor 6 is less than 730rpm (step S76).

In the case where the revolving speed of current motor 6 is less than 730rpm (step S76: yes), control unit 30 judges whether newest mobile aggregate-value Cn falls into the range of detection 5-1 (step S77).

Figure 14 is the chart for indicating the relationship of revolving speed and mobile aggregate-value Cn in association with detection 5-1 and detection 5-2.In the chart of Figure 14, horizontal axis indicates revolving speed (unit: rpm), and the longitudinal axis indicates mobile aggregate-value Cn.Referring to Fig.1 4, for the threshold value calculated in step S75, according to the difference of such as dehydration conditions, first threshold that setting is indicated with single dotted broken line and second threshold both threshold values indicated with double dot dash line.The One threshold value is higher than second threshold.

In dehydration conditions, exists and carry out the dehydration conditions of dehydration operating to 4 water storage of dehydration barrel and after " common rinsing " of rinsing washing materials Q, be directed at while draining washings Q and spray water and the dehydration conditions such as " water spray is dehydrated " and above-mentioned " restarting " that carries out dehydration operating.These dehydration conditions 20 are selected by operating the operating department by user, which is received by control unit 30.In dehydration operating after washing operating, after common rinsing, since washings contains a large amount of water, the acceleration of motor 6 needs power, in the case where water spray dehydration, restarting, since washings is in the state for eliminating water to a certain extent, power very little required for the acceleration of motor 6.

In dehydration operating after washing operating, after common rinsing, it is difficult to carry out due to using second threshold then to detect, control unit 30 uses the first threshold higher than second threshold.On the other hand, in water spray dehydration, the dehydration operating restarted, excessively loose due to using first threshold then to detect, control unit 30 uses the second threshold lower than first threshold.Therefore, it in the case where a large amount of water are contained either in washings Q, or in the case where washings Q is in and eliminates water to a certain extent, all uses with the suitable threshold value of respective situation and executes detection 5-1.

Furthermore, based on objective identical with the differentiation of such dehydration conditions, in the case where more than the load of the washings Q in dehydration barrel 4, in detection 5-1, it is difficult to carry out due to using second threshold then to detect, control unit 30 uses the first threshold higher than second threshold.In addition, in detection 5-1, excessively loose due to using first threshold then to detect, control unit 30 uses the second threshold lower than first threshold in the case that the load of the washings Q in dehydration barrel 4 is few.Therefore, detection 5-1 is executed using the suitable threshold value of situations different from the load of washings Q respectively.

It should be noted that, although in Figure 14, first threshold and second threshold both threshold values are instantiated, but the threshold value can also be set as three kinds or more according to various dehydration conditions, load.

Moreover, it is eccentric big and there are (4 dotted lines referring to Fig.1) in the case where the bias of washings Q, with the eccentric small bias that washings Q may be not present the case where (referring to solid line) compared with, the mobile aggregate-value Cn under each revolving speed is bigger.When the bias of washings Q is big, mobile aggregate-value Cn is more than a corresponding side in the threshold value, that is, first threshold and second threshold of setting.

Therefore, Figure 13 is returned to, when more than the threshold value that newest mobile aggregate-value Cn is setting, control unit 30 judges that mobile aggregate-value Cn is fallen into the range of detection 5-1 (step S77: yes).

When control unit 30 judges that mobile aggregate-value Cn is fallen into the range of detection 5-1 (step S77: yes), stops the rotation (above-mentioned step S63) of motor 6, execute and handled accordingly in above-mentioned step S64~S66.The processing of step S71~S77 includes (referring to Fig.1 2) in above-mentioned step S62.

Then, in the state of detecting 5-1 judgement and the bias of washings Q is not present when the revolving speed of motor 6 reaches 730rpm (step S76: no), control unit 30 terminates detection 5-1, then starts to detect 5-2 (step S78).

Referring to Fig.1 5, for control unit 30 in the state of continuing to accelerate motor 6, the revolving speed with motor 6 reaches 730rpm, starts to detect 5-2 (above-mentioned step S78).

Then, control unit 30 starts counting (step S79) by counter 36, by every 0.3 second initialization start-stop counter 36, so that every 0.3 second is once counted (step S80 and step S81).

Identical as the step S74 in detection 5-1, control unit 30 is in each count, the duty ratio dn for the voltage that the revolving speed of motor 6 and when counting apply motor 6 when obtaining primary count, and union goes out corrected value Bn and mobile aggregate-value Cn (step S82).

Then, control unit 30 is according to above-mentioned formula (4), the threshold value (step S83) of the mobile aggregate-value Cn of operation.The constant a and b for constituting the formula (4) is identical as detection 5-1, different because of the revolving speed of current motor 6, selected dehydration conditions.Therefore, there are multiple values as above-mentioned first threshold and second threshold under same rotating speed for threshold value herein.

Then, control unit 30 confirms whether the revolving speed of current motor 6 has reached rotating speed of target (800rpm) (step S84).

In the case where the revolving speed of current motor 6 is less than rotating speed of target (step S84: yes), control unit 30 is identical as (step S77) the case where detection 5-1, judges whether newest mobile aggregate-value Cn falls into the range of detection 5-2 (step S85).

Specifically, referring to Fig.1 4, it is eccentric big and the case where there are the bias of washings Q under (4 dotted lines referring to Fig.1), with the eccentric small bias that washings Q may be not present the case where (referring to solid line) compared with, the mobile aggregate-value Cn under each revolving speed is bigger.When the bias of washings Q is big, mobile aggregate-value Cn is more than a corresponding side in the threshold value, that is, first threshold and second threshold of setting.

Therefore, Figure 15 is returned to, when more than the threshold value that newest mobile aggregate-value Cn is setting, control unit 30 judges that mobile aggregate-value Cn is fallen into the range of detection 5-2 (step S85: yes).

When control unit 30 is in the range of judging that mobile aggregate-value Cn falls into detection 5-2 (step S85: yes), the time point for obtaining judgement detects the revolving speed L (step S86) of the motor 6 when 5-2 is detected.

Then, strictly speaking control unit 30 is by being that revolving speed obtained from 0 (zero) rotates 6 constant speed of motor to give up revolving speed L units value, to continue washings Q dehydration (above-mentioned step S69) with acquired revolving speed L.At this point, control unit 30 extends the dewatering time under revolving speed L, to obtain and dehydrating effect identical when being dehydrated with original rotating speed of target.

Then, detecting 5-2 judgement, there is no in the state of the bias of washings Q, when the revolving speed of motor 6 reaches rotating speed of target (step S84: no), control unit 30 terminates detection 5-2, by rotating 6 constant speed of motor with rotating speed of target, continue the dehydration (above-mentioned step S68) of washings Q.

As described above, control unit 30 changes threshold value (step S75 and step S83) according to the 20 received dehydration conditions of institute of operation portion in detection 5-1 and detection 5-2.Moreover, as the duty ratio dn obtained, when strictly speaking the duty ratio dn based on acquirement and the mobile aggregate-value Cn that calculates are the defined threshold changed or more, control unit 30 judges that there are the bias of washings Q in dehydration barrel 4.That is, by detecting washings Q with the suitable threshold value of each dehydration conditions, whether there is or not bias, therefore are able to achieve washings Q whether there is or not the raisings of the detection accuracy of bias due to can be in the dehydration of each dehydration conditions operating.

The present invention is not limited to embodiments described above, can make various changes within the scope of the claims.

For example, especially the revolving speed of motor 6 is lower than during 600rpm during being dehydrated operating, it is possible to the midway on draining road 14 can be blocked there is a phenomenon where foam and cannot successfully drained.Therefore, control unit 30 can also be performed in parallel the control of the foam in detection draining road 14 with the relevant control of above-mentioned detection 1~5.

Referring to Fig.1 6, control unit 30 starts the dehydration rotation (above-mentioned step S1) of dehydration barrel 4 and starting dehydration operating.The revolving speed of motor 6 rises as described above (referring to Fig. 3) as a result,.

The duty ratio of revolving speed and the voltage for being applied to motor 6 that control unit 30 obtains a motor 6 per defined timing in dehydration operating applies voltage duty cycle (step S91).

When the revolving speed of motor 6 is lower than 600rpm (step S92: yes), control unit 30 calculates voltage limit V_limit (step S93).Voltage limit V_limit is the duty ratio that the maximum voltage of motor 6 is applied under every revolving speed, is calculated and revolving speed is substituted into defined formula.

Moreover, whether control unit 30 is voltage limit V_limit or more by the application voltage duty cycle obtained in each timing verification step S91, the foam (step S94) in detection draining road 14.

Specifically, since in the case where foam blocks and drains road 14 and cannot drain, water is accumulated in the bottom of dehydration barrel 4, and dehydration barrel 4 is hindered to rotate, therefore in order to rotate dehydration barrel 4, it is necessary to apply and the comparable voltage of application voltage duty cycle more than voltage limit V_limit to motor 6.Therefore, when applying voltage duty cycle is voltage limit V_limit or more, the judgement of control unit 30 plugs the state (step S94: yes) on draining road 14 in foam.On the other hand, when applying voltage duty cycle less than voltage limit V_limit, control unit 30 judges the state (step S94: no) for being not at foam blocking draining road 14.

When the judgement of control unit 30 plugs state (the step S94: yes) on draining road 14 in foam, judge whether it is before restarting, that is to say, that judge restart (step S95) to whether the dehydration operating specifically stopped has performed.

When to restart preceding (step S95: yes), (step S96) is restarted in the execution of control unit 30.When not being to restart preceding (step S95: no), control unit 30 executes uneven amendment (step S97).It either executes and restarts still uneven amendment, dehydration operating can all restart after temporarily stopping.Therefore, during dehydration operating is restarted, the foam on draining road 14 can Lock-out.

On the other hand, when the revolving speed of motor 6 is 600rpm or more (step S92: no), control unit 30 terminates the processing (step S98) of detection foam.

In addition, the control of Figure 16 is applied not only to the detection of foam, moreover it can be used to which " backwater " this phenomenon on draining road 14 cannot be reached due to vibration etc. by detecting the water in outer barrel 3.

Furthermore, in the above-mentioned low speed core shift detection interval (referring to Fig. 3) of dehydration operating, detection 1~detection 4 is performed in order to carry out electro-detection whether there is or not bias to the washings Q in dehydration barrel 4, but it also can replace detection 1~detection 4 and execute detection 6 described below, 6 can also be will test and executed parallel with detection 1~detection 4.

Figure 17 is that the time diagram for indicating the state of the revolving speed of motor 6 of dehydration operating midway in association with detection 6 is specifically the figure of the part extraction for the low speed core shift detection interval that will be equivalent in Fig. 3.Therefore, Identical as Fig. 3 in the time diagram of Figure 17, horizontal axis indicates to pass through the time, and the longitudinal axis indicates the revolving speed (unit: rpm) of motor 6.It should be noted that in Figure 17, other than the state of the revolving speed of motor 6 indicated by the solid line, the state of the duty ratio of the voltage applied by control unit 30 to motor 6 is also indicated with dotted line etc. by reference.

Referring to Fig.1 7, control unit 30 controls duty ratio in the mode for the maximum value that motor 6 generates duty ratio from the midway of the 120rpm acceleration mode for accelerating to 240rpm so that in low speed core shift detection interval.At this point, the acceleration of motor 6 is controlled as fixing always.Hereinafter, the maximum value of the duty ratio generated in the midway of the acceleration mode of motor 6 is known as maximum duty cycle dmax.Specifically, for control unit 30 to resonate than dehydration barrel 4, the mode for specifically occurring to generate maximum duty cycle dmax when slightly lower revolving speed (such as 180rpm) of revolving speed (200rpm~220rpm) of longitudinal resonance controls duty ratio.

The size of load of the control regardless of the washings Q in dehydration barrel 4 of such duty ratio, all commonly executes.In addition, in order to realize the control, in control unit 30, preset the difference of the rotating speed of target and present actual speed that indicate motor 6, indicate gain of the revolving speed relative to the responsiveness of the variation of duty ratio etc..It should be noted that hereinafter, the revolving speed that longitudinal resonance occurs is known as longitudinal resonance revolving speed.

When control unit 30 accelerates motor 6 since 120rpm, as shown in dotted line, duty ratio is gradually increased in Figure 17.Then, maximum duty cycle dmax is generated when the revolving speed of motor 6 reaches 180rpm.When the bias of washings Q is not present in dehydration barrel 4, since 240rpm can be accelerated to duty ratio small electric machine 6, therefore duty ratio is shown in dotted line, is gradually reduced after generating maximum duty cycle dmax.

But when, there are when the bias of washings Q, vibration increases with the revolving speed of motor 6 close to longitudinal resonance revolving speed in dehydration barrel 4.Therefore, because must also increase duty ratio after generating maximum duty cycle dmax, therefore the duty ratio after generation maximum duty cycle dmax is not easy to reduce in order to which motor 6 is accelerated to 240rpm.Therefore, after generating maximum duty cycle dmax, duty ratio sometimes also can be as shown in 1 locking wire, the maintenance value slightly lower than maximum duty cycle dmax is without reducing in Figure 17, or as used shown in double dot dash line in Figure 17, increase after being temporarily lower than maximum duty cycle dmax.In detection 6, monitoring generates opposite variation of the duty ratio relative to maximum duty cycle dmax after maximum duty cycle dmax in this way, and to the washings Q in dehydration barrel 4, whether there is or not bias to carry out electro-detection.

Figure 18 is the flow chart for indicating the relevant control movement of detection 6.Referring to Fig.1 8, detection 6 is illustrated.

In above-mentioned steps S4, control unit 30 starts to accelerate motor 6 from 120rpm to 240rpm.Then, since under the acceleration mode until motor 6 accelerates to 240rpm, when the revolving speed of motor 6 reaches such as 180rpm, duty ratio is maximum value, therefore the maximum value is taken as maximum duty cycle dmax (step S101) by control unit 30.

In association with detection 6, there are count value G and aggregate-value H, are stored in memory 32.Count value G and aggregate-value H are reset to initial value 0 (zero) (step S101) respectively when obtaining maximum duty cycle dmax by control unit 30.

Then, after obtaining maximum duty cycle dmax, when the revolving speed of motor 6 reaches revolving speed (such as 200rpm) before longitudinal resonance occurring at once (step S102:YES), control unit 30 starts timer 35 and starts timing, and begins through counter 36 and counted (step S103).Start detection 6 as a result,.Control unit 30 initializes start-stop counter 36 by per stipulated time (such as 0.1 second), so that every 0.1 second is once counted (step S104 and step S105) referring to the value of timer 35.Count value G is added 1 (+1) primary by the timing of the initialization counter 36 in each step S105 of control unit 30, i.e., the timing counted every time.

Control unit 30 counts the duty ratio dg (g: count value G) (step S106) for all obtaining the voltage that motor 6 is once applied to when counting every time.In other words, 30 every 0.1 second this stipulated time of control unit obtains a duty ratio dg.

In addition, in step s 106, the per stipulated time of control unit 30 obtains a duty ratio dg, while calculating the aggregate-value H of duty ratio dg with the difference of maximum duty cycle dmax before.The difference is that maximum duty cycle dmax subtracts the resulting value of duty ratio dg, as soon as aggregate-value H is upper aggregate-value H plus the resulting value of newest difference, is updated when count value G adds 1.

Figure 19 is the figure for indicating the relationship of count value G and aggregate-value H in association with detection 6.In the chart of Figure 19, horizontal axis indicates that count value G, the longitudinal axis indicate aggregate-value H.Referring to Fig.1 9, when the bias of washings Q is not present in small eccentricity in dehydration barrel 4, as described above, duty ratio is gradually reduced after generating maximum duty cycle dmax.As a result, since duty ratio dg and the difference of maximum duty cycle dmax are gradually increased, aggregate-value H increases as shown by the solid line.On the other hand, when it is eccentric larger and there are when the bias of washings Q in dehydration barrel 4, as described above, the duty ratio after generating maximum duty cycle dmax is not easy to reduce.Therefore, because the difference of duty ratio dg and maximum duty cycle dmax is not easy to increase, therefore aggregate-value H is difficult to increase shown in dotted line.

Aggregate-value H sets defined threshold value.The threshold value using per stipulated time by adding the formula below (5) of 1 primary count value G and maximum duty cycle dmax as variable to find out.

Threshold value=(K × G-L)-M × (N-dmax) ... formula (5)

K, L, M and N in formula (5) are the constants found out in advance by experiment etc., are stored in memory 32.As shown in chain-dotted line, threshold value is changed in a manner of increasing with the increase of count value G in Figure 19.Threshold value can be pre-stored within memory 32, can also be based on formula (5) when changing count value G by control unit 30 and calculate.

Referring to Fig.1 8, when reach count value G be such as 20 timing, when specifically reaching the timing that longitudinal resonance starts (step S107:YES), control unit 30 confirms whether newest aggregate-value H is less than the defined threshold value (step S108) found out by formula (5).When aggregate-value H is less than threshold value (step S108:YES), control unit 30 judges that there are the bias of washings Q in dehydration barrel 4, stop motor 6 (step S109).The rotation of dehydration barrel 4 stops as a result,.It is identical as detection 1~4 after motor 6 stops, the processing of step S11~S18 can also be executed (referring to Fig. 5 B).

When aggregate-value H is not less than defined threshold value (step S108:NO), and when count value G reaches specified value (such as 81) (step S110:YES), the revolving speed of motor 6 reaches 240rpm, and motor 6 is in the state rotated with 240rpm constant speed.In this case, control unit 30 terminates 6 (step S111) of detection.

In this way, indicating index, that is, aggregate-value H detection 6 of the duty ratio dg relative to the opposite variation of maximum duty cycle dmax after generating maximum duty cycle dmax by monitoring, being able to achieve washings Q, whether there is or not the raisings of the detection accuracy of bias.

In particular, duty ratio is set in a manner of generating maximum duty cycle dmax in the revolving speed more slightly lower than longitudinal resonance revolving speed in detection 6.At this point, longitudinal resonance occurs for the relatively early timing after generating maximum duty cycle dmax.It is relatively early as a result, that there is a phenomenon where aggregate-value H to be difficult to increase.Therefore, early and it can be correctly detected in dehydration barrel 4 that there are the bias of washings Q.In addition, when generating maximum duty cycle dmax in longitudinal resonance revolving speed, it is possible to which revolving speed after occurring becomes unstable undesirable condition.But in the present embodiment, by generating maximum duty cycle dmax in the revolving speed more slightly lower than longitudinal resonance revolving speed, such undesirable condition can be inhibited.

Figure 20 is the figure for indicating the relationship of count value G and duty ratio in association with detection 6.In the figure of Figure 20, horizontal axis indicates that count value G, the longitudinal axis indicate duty ratio.Referring to Figure 20, when load is larger, such as It is shown in solid, in order to accelerate the revolving speed of motor 6 with fixed acceleration, biggish duty ratio is needed, maximum duty cycle dmax correspondingly becomes larger.On the other hand, when load is smaller, shown in dotted line, duty needed for the revolving speed as accelerating motor 6 with fixed acceleration is smaller, and maximum duty cycle dmax correspondingly becomes smaller.Therefore, for from the difference for generating the duty ratio dg after maximum duty cycle dmax has begun to pass through the stipulated time and maximum duty cycle dmax, difference S of the difference R obviously than load when larger when load is smaller is small.Therefore, it can be envisaged that aggregate-value H when load is smaller becomes difficult to increase compared with when load is larger, even if there be no the bias of washings Q, aggregate-value H is also below threshold value.In this way, when load is smaller, may error detection stop dehydration operating there are the bias of washings Q.

Therefore, threshold value by the formula (5) using count value G and maximum duty cycle dmax as variable as described above, found out.Therefore, because maximum duty cycle dmax is different because of the size of the load of the washings Q in dehydration barrel 4, therefore threshold value is different because of load is determined.Due to carrying out washings Q based on optimal threshold corresponding with the size of load of washings Q in dehydration barrel 4, whether there is or not the detections of bias for detection 6 as a result, even if can also prevent error detection in the lesser situation of load.Therefore, it is able to achieve washings Q further increasing whether there is or not the detection accuracy of bias.

In the above embodiment, premised on motor 6 is variable-frequency motor, motor 6 is controlled using duty ratio, but in the case where motor 6 is brush motor, duty ratio is replaced to control motor 6 using the value for the voltage for being applied to motor 6.

Although these specific numerical value are the performance according to dewaterer 1 and the value changed in addition, in the above description, used the specific numerical value such as 120rpm, 240rpm, 800rpm for revolving speed.Furthermore, in the above description, duty ratio is obtained sometimes and be used for various judgements, but the duty ratio can be the initial data of acquired duty ratio, it is also possible to the corrected value corrected as needed, can also be the value calculated as above-mentioned mobile aggregate-value Cn according to duty ratio.

Although in addition, the dehydration barrel 4 of above embodiment arranged perpendicular in a manner of it can pivot about along the axis 16 that up and down direction X extends, can also be arranged obliquely dehydration barrel 4 by obliquely extending axis 16 relative to up and down direction X.

Claims

A kind of dewaterer, which is characterized in that have:

Dehydration barrel accommodates washings, is rotated so that washings to be dehydrated；

Electric motor rotates the dehydration barrel；

Load determination unit measures the load of the washings in the dehydration barrel when the dehydration barrel starts rotation；

Drive control unit, after measuring load by the load determination unit, by the duty ratio for controlling the voltage applied to the motor, rotate the motor with the first rotation speed constant speed, then, the motor is rotated so that washings is formally dehydrated with the second rotation speed constant speed higher than first rotation speed；

The duty ratio of the voltage applied under acceleration mode until the motor accelerates to first rotation speed to the motor is taken as reference duty cycle by acquisition unit；

Timing determination unit determines that the acquisition unit obtains the timing of the reference duty cycle；

Judging unit, after the acquisition unit obtains the reference duty cycle, in during the prescribed period, based on the index for representing the case where maintaining first rotation speed and changing to the duty ratio for the voltage that the motor applies relative to the reference duty cycle, whether there is or not bias for the washings for judging in the dehydration barrel；And

Stop control unit stops the rotation of the dehydration barrel in judging unit judgement there are in the case where the bias of washings,

The load that the timing determination unit is measured according to the load determination unit determines that the acquisition unit obtains the timing of the reference duty cycle.
Dewaterer according to claim 1, it is characterized in that, including execution unit, the execution unit selects the processing of the bias of the washings in the rotation and the amendment dehydration barrel of the dehydration barrel of dehydration of the execution for restarting washings according to the index in the case where the stop control unit stops the rotation of the dehydration barrel.
Dewaterer according to claim 2, which is characterized in that

The drive control unit rotates the motor with the fixing speed constant speed lower than first rotation speed before rotating the motor with the first rotation speed constant speed,

The execution unit shortens the duration for rotating the motor with the fixing speed constant speed in the case where executing the rotation of the dehydration barrel for restarting the dehydration of washings.
A kind of dewaterer, which is characterized in that have:

Dehydration barrel accommodates washings, is rotated so that washings to be dehydrated；

Electric motor rotates the dehydration barrel；

Drive control unit, by the duty ratio for controlling the voltage applied to the motor, it rotates the motor with the first rotation speed constant speed, then, rotates the motor so that washings is formally dehydrated with the second rotation speed constant speed higher than first rotation speed；

Acquisition unit, it is interior during the prescribed period after the motor starts to accelerate to first rotation speed, the primary duty ratio is obtained per defined timing；

Counting unit, when the duty ratio obtained by the acquisition unit is more than or equal to the last duty ratio obtained, the count value that initial value is zero is added 1, when the duty ratio obtained by the acquisition unit is less than the last duty ratio obtained, the count value is reset into the initial value；

Judging unit judges the bias in the dehydration barrel there are washings when the count value is more than or equal to defined threshold value；And

Stop control unit judges to stop the rotation of the dehydration barrel there are in the case where the bias of washings in the judging unit.
A kind of dewaterer, which is characterized in that have:

Dehydration barrel accommodates washings, is rotated so that washings to be dehydrated；

Electric motor rotates the dehydration barrel；

Drive control unit, by the duty ratio for controlling the voltage applied to the motor, it rotates the motor with the first rotation speed constant speed, then, rotates the motor so that washings is formally dehydrated with the second rotation speed constant speed higher than first rotation speed；

Acquisition unit, the motor rotation speed from first rotation speed up to reaching described second In a period of rotation speed, the primary duty ratio is obtained per defined timing；

Judging unit judges the bias in the dehydration barrel there are washings when the duty ratio that the acquisition unit obtains is more than or equal to defined threshold value；

Stop control unit judges to stop the rotation of the dehydration barrel there are in the case where the bias of washings in the judging unit；

Receiving unit receives selection related with the dehydration conditions of washings；And

Threshold value changing unit changes the threshold value according to the dehydration conditions of the received selection of the receiving unit.
A kind of dewaterer, which is characterized in that have:

Dehydration barrel accommodates washings, is rotated so that washings to be dehydrated；

Electric motor rotates the dehydration barrel；

Drive control unit, by the duty ratio for controlling the voltage applied to the motor, it rotates the motor with the first rotation speed constant speed, then, rotates the motor so that washings is formally dehydrated with the second rotation speed constant speed higher than first rotation speed；

The maximum value of the duty ratio under acceleration mode until the motor accelerates to first rotation speed is taken and does maximum duty cycle by acquisition unit；

Computing unit calculates the aggregate-value of the duty ratio of per stipulated time and the difference of the maximum duty cycle after the acquisition unit obtains the maximum duty cycle；

Judging unit judges the bias in the dehydration barrel there are washings when the aggregate-value is less than defined threshold value；And

Stop control unit judges to stop the rotation of the dehydration barrel there are in the case where the bias of washings in the judging unit.
Dewaterer according to claim 6, which is characterized in that the threshold value using count value and the maximum duty cycle as the formula of variable by finding out, wherein the count value be add per the stipulated time it is 1 primary.
Dewaterer according to claim 6 or 7, which is characterized in that the drive control unit controls the duty ratio as follows: the acceleration shape until the motor accelerates to first rotation speed Under state, when the revolving speed that the dehydration barrel described in rotating ratio resonates is slightly lower, the maximum duty cycle is generated.