Apparatus and method for detecting eccentric position of washing machine and dehydration control method

Abstract

The invention discloses an apparatus and a method for detecting an eccentric position of a washing machine and a dehydration control method. The apparatus comprises a first acceleration sensor, a second acceleration sensor and an axial eccentric position detection module; the two acceleration sensors are mounted on the outer barrel wall of the washing machine, are coaxially mounted parallel to a center shaft of an outer barrel of the washing machine, and are used for obtaining a vibration displacement signal during rotation of an inner drum / barrel of the washing machine; the axial eccentric position detection module determines an axial eccentric position of the washing machine according to a difference of two vibration displacement signals, and is combined with an eccentric position sensorto determine a radial eccentric position to implement precise detection of an eccentric position, so that the dehydration control based on the eccentric position can sufficiently consider the difference of different positions of the inner drum / barrel of the washing machine to the eccentric tolerance, and the dehydration rotation speed control accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of washing machines, and in particular relates to an eccentric position detection device and method of a washing machine and a dehydration control method. Background technique [0002] As one of the important performance indicators of washing machines, "vibration noise" has always been a problem that major manufacturers in the home appliance industry are competing to solve. Noise reduction is becoming more and more difficult, but the problem of "vibration noise" has not been completely solved. [0003] According to the user survey results, the vibration and noise problem of washing machines generally occurs in the dehydration stage. The root cause is that the clothes are unevenly distributed during the washing process, resulting in large mass eccentricity. These eccentricities generate large inertial force after the dehydration reaches a certain speed. , so that the whole system will generate large vibratio...

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Problems solved by technology

[0004]The suspension system of the washing machine is a typical cantilever beam structure. Take the drum washing machine as an example. For any fixed constraint structure, the center of gravity of the cylinder is mostly located at the rear of the cylinder, that is, the rear of the cylinder has a greater tolerance for eccentricity; the inevitable problem of this structure is: in the case of the same eccentricity, the eccentricity is located in the cylinder The vibration generated by the system at the front is more severe than that at the rear of the cylinder, that is to say, under the same rotational speed and at the same vibration level, the eccentric at the front of the cylinder Must weigh less than its eccentric weight at the rear of the barrel

[0005] At present, during the dehydration process, the washing machine generally defines a certain preset value of eccentricity. When the eccentricity exceeds the preset value, select a low speed for dehydration, or reduce the eccentricity by water injection, etc., and then select a high speed to perform dehydration; this dehydration control method is only fuzzy to select the dehydration speed by the size of the eccentricity , did not consider the impact of the eccentric position on the vibration, resulting in inaccurate dehydration control. For example, if the eccentricity is located on the rear side of the cylinder, the dehydration speed will be reduced before vibration occurs, which makes The high moisture content of the clothes after dehydration will significantly increase the energy consumption of the drying process

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