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Detergent concentration detection device for washing machine and detection method thereof

A concentration detection, washing machine technology, applied in the direction of material resistance, etc., can solve the problems of complicated brands, difficulties, and large differences in detergent ingredients, and achieve the effect of avoiding direct detection and reducing detection costs

Inactive Publication Date: 2014-10-29
JIANGNAN UNIV
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Problems solved by technology

At present, there are many manufacturers of detergents in the market, the brands are complicated, and the main ingredients of de

Method used

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  • Detergent concentration detection device for washing machine and detection method thereof
  • Detergent concentration detection device for washing machine and detection method thereof
  • Detergent concentration detection device for washing machine and detection method thereof

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[0022] The specific implementation of the patent of the present invention will be further described below in conjunction with the accompanying drawings.

[0023] Taking into account the application cost and the particularity of the washing machine environment, the detergent concentration detection device makes full use of the resources of the washing machine itself, takes the washing machine microcontroller as the core, and is equipped with a sine wave AC excitation source, conductivity cell, signal processing circuit, and temperature compensation circuit. The system structure is like figure 1 Shown.

[0024] The principle of conductivity measurement is as follows figure 2 As shown, the AC excitation source ( image 3 ) AC voltage source U s Followed by signal ( Figure 4 ) U in Send to conductivity cell R x With divider resistor R m In the series circuit, the greater the conductivity of the solution in the conductivity cell R x The smaller, R m Obtain voltage U m The bigger it i...

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Abstract

The invention belongs to the field of concentration detection of solution ingredients, and particularly relates to a detergent concentration detection device for a washing machine and a detection method thereof. The detection device fully utilizes resources of the washing machine, takes a micro controller of the washing machines as a core, and then is configured with a sine wave alternating-current excitation source, a conductive cell, a signal processing circuit and a temperature compensation circuit; alternating-current voltage generated by the sine wave alternating-current excitation source is added to an electrode of the conductive cell; alternating-current signal current is generated in the conductive cell, is in direct proportion to conductivity of a detected solution, and is converted to be a direct-current voltage by current-voltage conversion as well as amplification and wave detection of the signal processing circuit; the temperature compensation circuit performs temperature compensation; finally, the concentration of a detergent is obtained by processing and conversion in the micro controller of the washing machine. According to the invention, the concentration of the detergent is obtained indirectly by measuring the conductivity of the solution, and the concentrations of detergents of different brands are in a favorable linear relationship with the conductivity especially within the concentration range of 0-0.15%.

Description

technical field [0001] The patent of the present invention relates to a detergent concentration detection device and a detection method for washing machines, belonging to the field of concentration detection of solution components. Background technique [0002] With the advancement of science and technology and the development of society, people's demand for intelligent washing machines is getting stronger and stronger. Washing machines that can only identify solid particles during rinsing are increasingly criticized by people. And rinsing process, the truly intelligent "clean and stop" washing machine that can identify the concentration of detergent has important economic and social significance for saving water and electricity and reducing the damage of detergent residue to the human body. Efficient and accurate detection of detergent concentration is the basis for intelligent control. Therefore, it is of great practical significance to develop a detergent concentration d...

Claims

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Application Information

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IPC IPC(8): G01N27/06
Inventor 潘丰潘杰
Owner JIANGNAN UNIV
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