CN101750188A - Method for detecting dehydrating unbalance of variable frequency pulsator washing machine - Google Patents
Method for detecting dehydrating unbalance of variable frequency pulsator washing machine Download PDFInfo
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- CN101750188A CN101750188A CN201010046511A CN201010046511A CN101750188A CN 101750188 A CN101750188 A CN 101750188A CN 201010046511 A CN201010046511 A CN 201010046511A CN 201010046511 A CN201010046511 A CN 201010046511A CN 101750188 A CN101750188 A CN 101750188A
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Abstract
The invention relates to a method for detecting dehydrating unbalance of a variable frequency pulsator washing machine, which comprises the following steps of: when the rotating speed of a dehydrating tube reaches a detecting speed of low-speed dehydrating, performing eccentricity detection on the dehydrating tube and judging whether the eccentric magnitude exceeds a predetermined low-speed eccentric magnitude, if so, performing eccentricity correction, and otherwise, continuously detecting the eccentric magnitude; and when the rotating speed of the dehydrating tube reaches a detecting speed of high-speed dehydrating, performing eccentricity detection on the dehydrating tube and judging whether the eccentric magnitude exceeds a predetermined high-speed eccentric magnitude, if so, performing eccentricity correction, and otherwise, performing high-speed dehydrating. The method is divided into two detection segments, namely detecting the rotating speed of the dehydrating tube in a low-speed range and detecting the rotating speed of the dehydrating tube in a high-speed range; due to different influences of the rotating speed of the dehydrating tube on the eccentric position of clothes in the dehydrating tube and the adoption of the unbalance detection on a two-segment speed platform, the eccentric position and magnitude of the clothes can be distinguished more accurately.
Description
Technical field
The present invention relates to the washing machine technical field, particularly a kind of unbalance detection of frequency-changing rotary drum washing machine dehydration.
Technical background
Washing machine is influenced by a biasing that interior clothing skewness produces when high speed dewatering, tends to produce bigger vibration.At present, on conventional laundry apparatus, adopted dual mode to avoid the generation of this situation: the first is installed a gimbal on the dehydration inner core, it adopts the special construction design and is filled with equilibrium liquid, when occurring the load biasing in the tube, the opposite of equilibrium liquid meeting automatic stream biasing, thus play equilibrium activity; It two is that a safety switch is installed in the dehydration tube outside, safety switch is between urceolus and casing, when imbalance takes place, inner core strikes safety switch, after control chip detects the bump signal, can stop current dehydration action, and water inlet dewaters after load is relaundered again, thereby laundry machine dehydration is produced bigger vibration and noise when having avoided load to be biased in high speed.
Because conventional laundry apparatus adopts squirrel cage motor, motor speed is fixed, and there are not testing circuit and a feedback circuit, therefore can only detect the bias conditions of load by above two kinds of methods, the shortcoming of these two kinds of methods is can only be when load biasing has taken place, and it could be detected after having caused certain vibration and noise.
Summary of the invention
Technical matters to be solved by this invention provides a kind of in the laundry machine dehydration process, to the unbalance detection of the frequency-changing rotary drum washing machine dehydration that the clothing bias state in the dehydration tube accurately detects and processing, automaticity are high.
A kind of unbalance detection of frequency-changing rotary drum washing machine dehydration, the testing process of this method is as follows:
The harvester that is used to gather the dehydration tube tach signal is gathered the tach signal of dehydration tube in real time, and exports this tach signal to the drive controlling chip, and the drive controlling chip receives the tach signal of dehydration tube and judges;
When the dehydration tube rotating speed reaches low speed dehydration detection speed, dehydration tube is carried out eccentricity detecting and judges whether offset surpasses the predetermined low-speed offset, if judged result is then carried out off-centre correction for being, otherwise continue to detect offset;
When the dehydration tube rotating speed reaches the high speed dewatering detection speed, dehydration tube is carried out eccentricity detecting and judges that whether offset surpasses predetermined high speed offset, if judged result is for being then to carry out the off-centre correction, otherwise enter high speed dewatering.
Described harvester is the hall speed sensor that is installed on the variable-frequency motor, the drive controlling chip is exported pwm control signal by the electronic switch tube module to variable-frequency motor, and hall speed sensor feeds back to the drive controlling chip with the dehydration tube tach signal that collects.
When the dehydration tube rotating speed reached low speed dehydration detection speed, the drive controlling chip detected the dutycycle of pwm control signal, and described low speed dehydration detection speed is 180～220rpm; When the dehydration tube rotating speed reached the high speed dewatering detection speed, the drive controlling chip detected the dehydration tube tach signal, and described high speed dewatering detection speed is 240rpm.
When the dehydration tube rotating speed reached 120rpm, the drive controlling chip detected the dutycycle of pwm control signal after 5 seconds, and with this dutycycle as reference value d
0, after this gathered a current dutyfactor value, and calculate itself and reference value d every 0.3 second
0Difference DELTA d
n, after 13.5 seconds, calculate the quadratic sum of 45 Δ d, i.e. ∑ { (Δ d1～n)
2, and the threshold value of this quadratic sum and storage compared, if greater than threshold value, then expression exists eccentricly, carries out off-centre correction; Otherwise expression is eccentric less, continues to detect.
When the dehydration tube rotating speed reached 240rpm, the drive controlling chip write down current dehydration tube rotating speed after 5 seconds, and this rotating speed is deducted initial speed 240rpm obtained velocity contrast, with the threshold ratio of this velocity contrast and storage, if less than threshold value, then there is off-centre in expression, carries out off-centre correction; Otherwise expression is eccentric less, enters high speed dewatering.
After carrying out the off-centre correction, judge whether off-centre correction number of times surpasses the off-centre correction number of times of being scheduled to, if judged result is then carried out the off-centre warning for being, otherwise, return the rotating speed that continuation detects dehydration tube.
Described predetermined off-centre correction number of times is 3 times.
The present invention compared with prior art, the present invention is divided into two detection segment of rotating speed that detect the rotating speed of dehydration tube and detect dehydration tube in low-speed range in high-speed range, because the rotating speed of dehydration tube height can cause different influences to the eccentric position of clothing in the dehydration tube, and take the imbalance on this two sections speed platforms to detect, can distinguish the core shift position and the core shift amount size of clothing more accurately.Simultaneously, the low speed detection speed that dewaters is limited in the longitudinal resonance regional extent, in this scope, detects eccentric accuracy height.In addition, take different dehydration controlling methods and correction strategy according to the core shift situation, promptly carry out off-centre and revise or carry out the off-centre warning, intelligent degree is higher, can reach quick correction, steadily, dehydrating effect efficiently.
Description of drawings
Fig. 1 is a circuit diagram of the present invention;
Fig. 2 is a detection schematic diagram of the present invention;
Fig. 3 is a workflow diagram of the present invention.
Embodiment
A kind of unbalance detection of frequency-changing rotary drum washing machine dehydration, as shown in Figure 3, the testing process of this method is as follows: the harvester that is used to gather the dehydration tube tach signal is gathered the tach signal of dehydration tube in real time, and exporting this tach signal to drive controlling chip 1, drive controlling chip 1 receives the tach signal of dehydration tube and judges; When the dehydration tube rotating speed reaches low speed dehydration detection speed, dehydration tube is carried out eccentricity detecting and judges whether offset surpasses the predetermined low-speed offset, if judged result is then carried out off-centre correction for being, otherwise continue to detect offset; When the dehydration tube rotating speed reaches the high speed dewatering detection speed, dehydration tube is carried out eccentricity detecting and judges that whether offset surpasses predetermined high speed offset, if judged result is for being then to carry out the off-centre correction, otherwise enter high speed dewatering.Washing machine urceolus, dehydration tube and variable-frequency motor 3 are fixed together by gear train, and variable-frequency motor 3 and dehydration tube rotate together during dehydration, and speed is identical, and drive controlling chip 1 drives variable-frequency motor 3 and rotates.
Described harvester is the hall speed sensor 4 that is installed on the variable-frequency motor 3, drive controlling chip 1 is exported pwm control signals by electronic switch tube module 2 to variable-frequency motor 3, hall speed sensor 4 feeds back to drive controlling chip 1 with the dehydration tube tach signal that collects, as shown in Figure 1.Thereby drive controlling chip 1 is controlled the rotating speed of electronic switch tube module 2 control of conversion motors 3 by exporting pwm control signal, and the size of PWM dutycycle has determined the rotating speed of variable-frequency motor 3; Hall speed sensor 4 is gathered the rate signal of variable-frequency motor 3 simultaneously, for the dutycycle of drive controlling chip 1 decision PWM.When dehydration tube is eccentric, the whole washing chance is in front and back and left and right directions swing during dehydration, record the speed of variable-frequency motor 3 and the PWM change in duty cycle of drive controlling chip 1 by the hall speed sensor 4 that is contained on the variable-frequency motor 3, the amplitude of swing can be calculated out, thereby extrapolate eccentric size.
The dehydration of washing machine is divided into three phases from low to high according to the dehydration tube rotating speed: low speed water smoking 1, low speed water smoking 2 and high speed dewatering stage.The low speed water smoking 1 below 120rpm because rotating speed is less, need not it is carried out eccentricity detecting, therefore, only carries out eccentricity detecting in low speed water smoking 2 and high speed dewatering stage.
When the dehydration tube rotating speed reached low speed dehydration detection speed, the dutycycle of 1 pair of pwm control signal of drive controlling chip detected, and described low speed dehydration detection speed is 180～220rpm; When the dehydration tube rotating speed reached the high speed dewatering detection speed, 1 pair of dehydration tube tach signal of drive controlling chip detected, and described high speed dewatering detection speed is 240rpm, shown in Fig. 2,3.
When the dehydration tube rotating speed reached 120rpm, drive controlling chip 1 detected the dutycycle of pwm control signal after 5 seconds, and with this dutycycle as reference value d
0, after this gathered a current dutyfactor value, and calculate itself and reference value d every 0.3 second
0Difference DELTA d
n, after 13.5 seconds, calculate the quadratic sum of 45 Δ d, i.e. ∑ { (Δ d
1～n)
2, and the threshold value of this quadratic sum and storage being compared, the threshold value of being stored among the present invention is 112, if greater than this threshold value, then expression exists eccentricly, carries out off-centre correction; Otherwise expression is eccentric less, continues to detect, shown in Fig. 2,3.The off-centre correction of being carried out among the present invention is meant and stops current dehydration action, and water inlet is dewatered after load is relaundered again.After carrying out the off-centre correction, judge whether the eccentric number of times of revising surpasses predetermined off-centre correction number of times, if judged result is for being, then carrying out off-centre reports to the police, otherwise, return the rotating speed that continues to detect dehydration tube, judge whether to reach the scope of low speed dehydration detection speed, described predetermined off-centre correction number of times is 3 times.
When the dehydration tube rotating speed reaches 240rpm, drive controlling chip 1 write down current dehydration tube rotating speed after 5 seconds, and this rotating speed is deducted initial speed 240rpm obtain velocity contrast, with the threshold ratio of this velocity contrast and storage, the threshold value of being stored among the present invention is 20rpm, if less than this threshold value, then there is off-centre in expression, carries out off-centre correction; Otherwise expression is eccentric less, enters high speed dewatering, shown in Fig. 2,3.After carrying out the off-centre correction, judge whether the eccentric number of times of revising surpasses the off-centre correction number of times of being scheduled to, if judged result is for being, then carry out off-centre and report to the police, otherwise, the rotating speed that continues to detect dehydration tube returned, whether this is to 240rpm to judge its rotating speed, and described predetermined off-centre correction number of times is 3 times.
When the motor of washing machine adopts variable-frequency motor 5, by hall speed sensor 4, in the laundry machine dehydration process, we can detect the fluctuation of dehydration tube at acceleration or speed stabilizing process medium velocity, and different loads also is different with the PMW dutycycle of the electronic switch tube module 2 of eccentric correspondence.By long-term test, draw the variation of speed, the situation of change of PWM dutycycle and the relation of load biasing, thereby judge recently by the duty that detects hall signal and PWM whether washing machine the load biasing has taken place, and then carry out off-centre correction or eccentric the warning.
Claims (7)
1. the unbalance detection of frequency-changing rotary drum washing machine dehydration is characterized in that testing process is as follows:
The harvester that is used to gather the dehydration tube tach signal is gathered the tach signal of dehydration tube in real time, and exports this tach signal to the drive controlling chip, and the drive controlling chip receives the tach signal of dehydration tube and judges;
When the dehydration tube rotating speed reaches low speed dehydration detection speed, dehydration tube is carried out eccentricity detecting and judges whether offset surpasses the predetermined low-speed offset, if judged result is then carried out off-centre correction for being, otherwise continue to detect offset;
When the dehydration tube rotating speed reaches the high speed dewatering detection speed, dehydration tube is carried out eccentricity detecting and judges that whether offset surpasses predetermined high speed offset, if judged result is for being then to carry out the off-centre correction, otherwise enter high speed dewatering.
2. the unbalance detection of frequency-changing rotary drum washing machine dehydration according to claim 1, it is characterized in that: described harvester is the hall speed sensor that is installed on the variable-frequency motor, the drive controlling chip is exported pwm control signal by the electronic switch tube module to variable-frequency motor, and hall speed sensor feeds back to the drive controlling chip with the dehydration tube tach signal that collects.
3. the unbalance detection of frequency-changing rotary drum washing machine dehydration according to claim 1 and 2, it is characterized in that: when the dehydration tube rotating speed reaches low speed dehydration detection speed, the drive controlling chip detects the dutycycle of pwm control signal, and described low speed dehydration detection speed is 180～220rpm; When the dehydration tube rotating speed reached the high speed dewatering detection speed, the drive controlling chip detected the dehydration tube tach signal, and described high speed dewatering detection speed is 240rpm.
4. the unbalance detection of frequency-changing rotary drum washing machine according to claim 3 dehydration, it is characterized in that: when the dehydration tube rotating speed reached 120rpm, the drive controlling chip detected the dutycycle of pwm control signal after 5 seconds, and with this dutycycle as reference value d
0, after this gathered a current dutyfactor value, and calculate itself and reference value d every 0.3 second
0Difference DELTA d
n, after 13.5 seconds, calculate the quadratic sum of 45 Δ d, i.e. ∑ { (Δ d
1～n)
2, and the threshold value of this quadratic sum and storage compared, if greater than threshold value, then expression exists eccentricly, carries out off-centre correction; Otherwise expression is eccentric less, continues to detect.
5. the unbalance detection of frequency-changing rotary drum washing machine dehydration according to claim 3, it is characterized in that: when the dehydration tube rotating speed reaches 240rpm, the drive controlling chip write down current dehydration tube rotating speed after 5 seconds, and this rotating speed is deducted initial speed 240rpm obtain velocity contrast, with the threshold ratio of this velocity contrast and storage, if less than threshold value, then there is off-centre in expression, carries out off-centre correction; Otherwise expression is eccentric less, enters high speed dewatering.
6. according to the unbalance detection of claim 4 or the dehydration of 5 described frequency-changing rotary drum washing machines, it is characterized in that: after carrying out the off-centre correction, judge whether the eccentric number of times of revising surpasses predetermined off-centre correction number of times, if judged result is for being, then carrying out off-centre reports to the police, otherwise, return the rotating speed that continues to detect dehydration tube.
7. the unbalance detection of frequency-changing rotary drum washing machine dehydration according to claim 6, it is characterized in that: described predetermined off-centre correction number of times is 3 times.
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| CN201010046511A CN101750188A (en) | 2010-01-06 | 2010-01-06 | Method for detecting dehydrating unbalance of variable frequency pulsator washing machine |
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| CN201010046511A CN101750188A (en) | 2010-01-06 | 2010-01-06 | Method for detecting dehydrating unbalance of variable frequency pulsator washing machine |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015192403A1 (en) * | 2014-06-16 | 2015-12-23 | 青岛海尔洗衣机有限公司 | Method for detecting imbalance of washing machine, and washing machine |
| CN105200711A (en) * | 2014-06-16 | 2015-12-30 | 青岛海尔洗衣机有限公司 | Method for detecting imbalance of washing machine and washing machine |
| CN105200712A (en) * | 2014-06-17 | 2015-12-30 | 青岛海尔洗衣机有限公司 | Washing machine dewatering balancing method and washing machine |
| CN106436154A (en) * | 2016-09-30 | 2017-02-22 | 无锡小天鹅股份有限公司 | Washing machine and dehydration control method and device thereof |
| CN111962256A (en) * | 2019-05-20 | 2020-11-20 | 青岛海尔智能技术研发有限公司 | Washing machine eccentric position detection device and method and dehydration control method |
| CN114541089A (en) * | 2020-11-26 | 2022-05-27 | 无锡小天鹅电器有限公司 | Clothes treatment equipment, rotation balance control method and device thereof and storage medium |
-
2010
- 2010-01-06 CN CN201010046511A patent/CN101750188A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015192403A1 (en) * | 2014-06-16 | 2015-12-23 | 青岛海尔洗衣机有限公司 | Method for detecting imbalance of washing machine, and washing machine |
| CN105200711A (en) * | 2014-06-16 | 2015-12-30 | 青岛海尔洗衣机有限公司 | Method for detecting imbalance of washing machine and washing machine |
| CN105200711B (en) * | 2014-06-16 | 2019-04-19 | 青岛海尔洗衣机有限公司 | A kind of washing machine unbalance detection and washing machine |
| CN105200712A (en) * | 2014-06-17 | 2015-12-30 | 青岛海尔洗衣机有限公司 | Washing machine dewatering balancing method and washing machine |
| CN105200712B (en) * | 2014-06-17 | 2019-02-15 | 青岛海尔洗衣机有限公司 | A kind of laundry machine dehydration balance method and washing machine |
| CN106436154A (en) * | 2016-09-30 | 2017-02-22 | 无锡小天鹅股份有限公司 | Washing machine and dehydration control method and device thereof |
| CN111962256A (en) * | 2019-05-20 | 2020-11-20 | 青岛海尔智能技术研发有限公司 | Washing machine eccentric position detection device and method and dehydration control method |
| CN111962256B (en) * | 2019-05-20 | 2023-02-17 | 青岛海尔智能技术研发有限公司 | Washing machine eccentric position detection device and method and dehydration control method |
| CN114541089A (en) * | 2020-11-26 | 2022-05-27 | 无锡小天鹅电器有限公司 | Clothes treatment equipment, rotation balance control method and device thereof and storage medium |
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Open date: 20100623 |