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CN-121976371-A - Fixed-frequency pulsator inner cylinder eccentricity detection method and washing machine thereof

CN121976371ACN 121976371 ACN121976371 ACN 121976371ACN-121976371-A

Abstract

The invention discloses a method for detecting eccentricity of an inner cylinder of a fixed-frequency pulsator and a washing machine thereof, and relates to the field of eccentricity detection of washing machines. The method for detecting the eccentricity of the inner cylinder of the fixed-frequency impeller comprises the following steps of starting, namely starting a forward winding of a motor to drive the inner cylinder to forward rotate or starting a reverse winding of the motor to drive the inner cylinder to reverse, collecting back electromotive force signals of a reverse winding in the forward rotation process of the inner cylinder or collecting back electromotive force signals of the forward winding in the reverse rotation process of the inner cylinder, calculating rising slope or first voltage difference or voltage fluctuation value of the back electromotive force signals in a time period T, judging the eccentricity of the inner cylinder according to the rising slope or the first voltage difference or voltage fluctuation value, and outputting that the eccentricity of the inner cylinder is larger as the rising slope is smaller or the first voltage difference is smaller or the voltage fluctuation value is larger. The eccentric detection method and the washing machine have the advantages of high detection accuracy, low cost, short time consumption, low noise and low running loss of the washing machine.

Inventors

  • LIU HUIQUAN
  • ZHANG GUOQING

Assignees

  • 合肥惟新数控科技有限公司

Dates

Publication Date
20260505
Application Date
20260324

Claims (17)

  1. 1. The method for detecting the eccentricity of the inner cylinder of the fixed-frequency impeller is characterized by comprising the following steps of: The starting step is that a forward rotation winding of a starting motor drives the inner cylinder to forward rotate, or a reverse rotation winding of the starting motor drives the inner cylinder to reverse rotation; The acquisition step is to acquire the back electromotive force signal of the reverse winding in the forward rotation process of the inner cylinder or acquire the back electromotive force signal of the forward rotation winding in the reverse rotation process of the inner cylinder; Calculating the rising slope or the first voltage difference or the voltage fluctuation value of the back electromotive force signal in the time period T, judging the eccentricity of the inner cylinder according to the rising slope or the first voltage difference or the voltage fluctuation value, and outputting the eccentricity of the inner cylinder to be larger when the rising slope is smaller or the first voltage difference is smaller or the voltage fluctuation value is larger.
  2. 2. The method for detecting eccentricity of an inner cylinder of a constant frequency pulsator according to claim 1, wherein in the starting step, the motor is started to drive the inner cylinder to rotate for 0.5-5 seconds.
  3. 3. The method of claim 2, wherein in the step of starting, the motor is started to drive the inner cylinder to rotate for 1 second or 1.5 seconds or 2 seconds or 2.5 seconds or 3 seconds or 3.5 seconds or 4 seconds or 4.5 seconds.
  4. 4. The method for detecting eccentricity of an inner cylinder of a fixed frequency pulsator according to claim 1, wherein the period T is 10 ms to 5 seconds.
  5. 5. The method for detecting eccentricity of an inner drum of a fixed frequency pulsator as claimed in claim 4, wherein the time period T is 1 second or 1.5 seconds or 2 seconds or 2.5 seconds or 3 seconds or 3.5 seconds or 4 seconds or 4.5 seconds.
  6. 6. The method for detecting eccentricity of the drum of a fixed frequency impeller according to any one of claims 1 to 5, further comprising, in the step of processing, comparing the rising slope with a rising slope threshold value, and/or comparing the first voltage difference with a first voltage difference threshold value, and/or comparing the voltage fluctuation value with a voltage fluctuation threshold value; Outputting an over-eccentricity signal if the rising slope is less than or equal to a rising slope threshold, and/or the first voltage difference is less than or equal to the first voltage difference threshold, and/or the voltage fluctuation value is greater than or equal to a voltage fluctuation threshold.
  7. 7. The method for detecting eccentricity of an inner drum of a fixed frequency pulsator according to any one of claims 1 to 5, wherein the processing step is replaced with: Calculating the rising slope or a first voltage difference or a voltage fluctuation value of the back electromotive force signal in a time period T, and comparing the rising slope with a rising slope threshold value, and/or comparing the first voltage difference with a first voltage difference threshold value, and/or comparing the voltage fluctuation value with a voltage fluctuation threshold value; Outputting an over-eccentricity signal if the rising slope is less than or equal to a rising slope threshold, and/or the first voltage difference is less than or equal to the first voltage difference threshold, and/or the voltage fluctuation value is greater than or equal to a voltage fluctuation threshold.
  8. 8. The method for detecting the eccentricity of the inner cylinder of the fixed-frequency impeller is characterized by comprising the following steps of: the starting step is that the motor is started to drive the inner cylinder to rotate and then the motor is powered off; The acquisition step is to acquire a back electromotive force signal in the power-off process of the motor; Calculating the descending slope of the back electromotive force signal in a time period T or the second voltage difference or the oscillation frequency or the accumulated value of the peak value or the peak value, judging the eccentricity of the inner cylinder according to the descending slope or the second voltage difference or the oscillation frequency or the accumulated value of the peak value or the peak value, and outputting the eccentricity of the inner cylinder to be larger when the descending slope is smaller or the second voltage difference is smaller or the oscillation frequency is smaller or the peak value is smaller or the accumulated value of the peak value is smaller.
  9. 9. The method for detecting eccentricity of an inner cylinder of a fixed frequency pulsator according to claim 8, wherein in the starting step, a forward rotation winding of the motor is started to drive the inner cylinder to rotate forward, or a reverse rotation winding of the motor is started to drive the inner cylinder to rotate reversely; In the collecting step, a back electromotive force signal of a forward winding of the motor is collected, and/or a back electromotive force signal of a reverse winding of the motor is collected.
  10. 10. The method for detecting eccentricity of an inner cylinder of a constant frequency impeller according to claim 8, wherein in the starting step, the motor is started to drive the inner cylinder to rotate for 0.5-5 seconds.
  11. 11. The method of claim 10, wherein in the step of starting, the motor is started to drive the inner cylinder to rotate for 1 second or 1.5 seconds or 2 seconds or 2.5 seconds or 3 seconds or 3.5 seconds or 4 seconds or 4.5 seconds.
  12. 12. The method for detecting eccentricity of an inner cylinder of a fixed frequency pulsator according to claim 8, wherein the period T is 10 ms to 5 seconds.
  13. 13. The method for detecting eccentricity of an inner drum of a fixed frequency pulsator according to claim 13, wherein the time period T is 1 second or 1.5 seconds or 2 seconds or 2.5 seconds or 3 seconds or 3.5 seconds or 4 seconds or 4.5 seconds.
  14. 14. The fixed frequency pulsator inner cylinder eccentricity detection method according to any one of claims 7 to 13, further comprising, in the processing step: comparing the falling slope with a falling slope threshold, and/or comparing the second voltage difference with a second voltage difference threshold, and/or comparing the number of oscillations with an oscillation threshold, and/or comparing the peak-to-peak value with a peak threshold, and/or comparing an accumulated value of the peak-to-peak value with an accumulated threshold; Outputting an decenter excessive signal if the falling slope is smaller than or equal to a falling slope threshold value, and/or the second voltage difference is smaller than or equal to a second voltage difference threshold value, and/or the oscillation frequency is smaller than or equal to an oscillation threshold value, and/or the peak-to-peak value is smaller than or equal to a peak threshold value, and/or the cumulative value of the peak-to-peak value is smaller than or equal to a cumulative threshold value.
  15. 15. The fixed frequency pulsator inner cylinder eccentricity detection method according to any one of claims 7 to 13, wherein the processing step is replaced with: Calculating a falling slope or a second voltage difference or a frequency of oscillation or an accumulated value of a peak or a peak-to-peak value of the back electromotive force signal in a time period T, and comparing the falling slope with a falling slope threshold value, and/or comparing the second voltage difference with a second voltage difference threshold value, and/or comparing the frequency of oscillation with an oscillation threshold value, and/or comparing the peak-to-peak value with a peak threshold value, and/or comparing the accumulated value of the peak-to-peak value with an accumulated threshold value; Outputting an decenter excessive signal if the falling slope is smaller than or equal to a falling slope threshold value, and/or the second voltage difference is smaller than or equal to a second voltage difference threshold value, and/or the oscillation frequency is smaller than or equal to an oscillation threshold value, and/or the peak-to-peak value is smaller than or equal to a peak threshold value, and/or the cumulative value of the peak-to-peak value is smaller than or equal to a cumulative threshold value.
  16. 16. A washing machine characterized in that the method for detecting the eccentricity of the inner cylinder of the constant-frequency pulsator according to any one of claims 1 to 15 is adopted.
  17. 17. A washing machine, characterized in that the method for detecting the eccentricity of the inner cylinder of the fixed-frequency pulsator according to any one of claims 1 to 8 is adopted, and then the method for detecting the eccentricity of the inner cylinder of the fixed-frequency pulsator according to any one of claims 9 to 15 is adopted.

Description

Fixed-frequency pulsator inner cylinder eccentricity detection method and washing machine thereof Technical Field The invention relates to the field of eccentric detection of washing machines, in particular to a fixed-frequency impeller inner cylinder eccentric detection method and a washing machine thereof. Background In order to prevent the washing machine from violent vibration and collision with the box body (commonly called as 'collision of the barrel') caused by overlarge eccentric amount in the dehydration process, and even shift or damage the internal mechanical structure, the eccentric amount of the inner barrel of the washing machine is usually required to be detected before the dehydration process is started, namely, the eccentric amount of the inner barrel can be estimated through the function of detecting the eccentric amount of the impeller, so that the damage to the washing machine caused by serious collision with the barrel in the dehydration process is avoided. The second is to use photoelectric ball switch, which uses balls to cover the light path between LED and light sensor on the horizontal plane, when the balls are shocked or placed obliquely, the light path is opened to output high and low level to realize the detection of eccentric shock. The first is to detect a barrel collision by detecting abrupt changes in position in the horizontal plane direction using an acceleration sensor. The first is to use a mechanical barrel collision switch installed on the barrel, the barrel collision switch is composed of two metal sheets and a guide rod, the guide rod is connected with one metal sheet, under the default state, as the two metal elastic metal sheets are in close contact and in the conducting state, the barrel can collide with the guide rod when shaking violently, the metal sheets are separated to form an open circuit, so that the detection of the barrel collision can be realized through the open circuit. However, since the eccentric detection technology of the three pulsator washing machines needs to be provided with the photoelectric ball switch, the acceleration sensor and the mechanical barrel collision switch respectively, the provided switches or sensors have cost, and the installation and fixation are needed, so that the assembling steps are increased, and the production cost is increased. Disclosure of Invention The invention aims to provide a fixed-frequency impeller inner cylinder eccentricity detection method which can solve the problem of high cost in the prior art. Another object of the present invention is to provide a washing machine to which the above eccentricity detection method is applied. In order to achieve the purpose, the technical scheme adopted by the application is that the method for detecting the eccentricity of the inner cylinder of the fixed-frequency impeller comprises the following steps: The starting step is that a forward rotation winding of a starting motor drives the inner cylinder to forward rotate, or a reverse rotation winding of the starting motor drives the inner cylinder to reverse rotation; The acquisition step is to acquire the back electromotive force signal of the reverse winding in the forward rotation process of the inner cylinder or acquire the back electromotive force signal of the forward rotation winding in the reverse rotation process of the inner cylinder; Calculating the rising slope or the first voltage difference or the voltage fluctuation value of the back electromotive force signal in the time period T, judging the eccentricity of the inner cylinder according to the rising slope or the first voltage difference or the voltage fluctuation value, and outputting the eccentricity of the inner cylinder to be larger when the rising slope is smaller or the first voltage difference is smaller or the voltage fluctuation value is larger. Preferably, in the step of starting, the motor is started to drive the inner cylinder to rotate for 0.5-5 seconds. Preferably, in the step of starting, the motor is started to drive the inner cylinder to rotate for 1 second or 1.5 seconds or 2 seconds or 2.5 seconds or 3 seconds or 3.5 seconds or 4 seconds or 4.5 seconds. Preferably, the period T is 10 milliseconds to 5 seconds. Preferably, the time period T is 1 second or 1.5 seconds or 2 seconds or 2.5 seconds or 3 seconds or 3.5 seconds or 4 seconds or 4.5 seconds. Preferably, in the processing step, the method further comprises the steps of comparing the rising slope with a rising slope threshold value and/or comparing the first voltage difference with a first voltage difference threshold value and/or comparing the voltage fluctuation value with a voltage fluctuation threshold value, and outputting an eccentric excessive signal if the rising slope is smaller than or equal to the rising slope threshold value and/or the first voltage difference is smaller than or equal to the first voltage difference threshold value and/or the voltage fluctuation value i