Pulse type electromagnetic induction principle based metal foreign matter detection system and method of washing machine

Abstract

The invention discloses a pulse type electromagnetic induction principle based metal foreign matter detection system and method of a washing machine. The system comprises a detection coil arranged on the outer side of a dewatering barrel of the washing machine; a pulse transmitting circuit is electrically connected with the detection coil and sends a pulse signal to the detection coil; a signal processing circuit is electrically connected with the detection coil and receives an induction signal sent by the detection coil; a receiving control circuit is electrically connected with the signal processing circuit and controls whether the induction signal sent by the detection coil is received or not; and a main control processing circuit is electrically connected with the pulse transmitting circuit and sends a pulse transmitting time sequence to the pulse transmitting circuit. According to the detection system disclosed by the invention, based on the time domain pulse type electromagnetic induction principle, the detection coil is driven by periodic pulse current to emit alternating electromagnetic waves into a drum of the washing machine, the alternating electromagnetic waves are called a primary field, if metal foreign matter exists in pockets of clothes put into the drum, eddy current can be generated to excite a secondary field, the secondary field is received by the detection coil, and the detection system performs processing and then gives an alarm, thereby achieving the purpose of detecting the metal foreign matter.

Description

Technical field [0001] The invention belongs to the field of metal foreign matter detection in the washing machine, and more particularly to a metal foreign body detection system and method based on pulsed electromagnetic induction principles. Background technique [0002] With the improvement of people's living standards, the washing machine has gradually become one of the necessary home appliances in the home. While users enjoy the convenient laundry experience of the washing machine, they often forget the key, coin, electronic products such as the pocket, etc. take out. During the laundry, the valuable electronic product is easy to immerse damage. If there is a drying function, it will exacerbate the damage of the electronic product. If some metal foreign matter fell from the pocket during the washing, the drum of the washing machine will also cause the drum of the washing machine. Wear. [0003] The application number is 201710763462.2, and the application date is a foreign m...

AI Technical Summary

Problems solved by technology

Although the real-time detection of foreign objects is good, the detection accuracy is poor and the detection effect is not ideal

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