A control method for automatic speed regulation of range hood based on image analysis

Abstract

The invention discloses an automatic extractor hood speed regulating control method based on image analysis and an automatic extractor hood speed regulating control system based on mage analysis. The control method specifically comprises the following steps: (1), by virtue of an image acquisition unit, collecting an oil fume image of the upper part of a gas stove at a fixed frequency f; (2), by virtue of an image processing unit, extracting edge information by taking frame difference image of the collected oil fume image and an oil fume-free background image as a signal source; (3), by virtue of a main controller, performing quantitative analysis by taking the edge information transmitted by the image processing unit as an image feature value, thereby obtaining a frequency signal required by a frequency conversion fan; and (4), by virtue of the frequency conversion fan, regulating the rotation speed according to the received frequency signal sent by the main controller. By virtue of an image analysis means, the concentration of oil fume generated by the gas stove is detected in real time, the rotation speed of the fan is regulated and closed-loop automatic control is realized.

Description

technical field [0001] The invention relates to the technical field of automatic speed regulation of range hoods, in particular to an image analysis-based automatic speed regulation control method and control system for range hoods. Background technique [0002] During the cooking process in the kitchen, the amount of oil fume changes very frequently. If the range hood is placed in a high-speed operating state, the noise caused by the high-speed rotation of the fan will be huge. When it increases during cooking such as frying, if it cannot be discharged in time, it will endanger human health. Therefore, the motor of the traditional range hood uses the technology of variable frequency motor for stepless speed regulation, and high (medium) and low speed regulation are set, but because the concentration of oil fume cannot be detected online and quickly, the motor speed cannot be adjusted according to the current smoke volume. The formation of a closed-loop control requires the...

AI Technical Summary

Problems solved by technology

However, the oil fume processed by the range hood is in a directional flow state, it is difficult to enter the inside of the ordinary sensor, and the working conditions are harsh. Over a long period of time, it is easy to leave dirt such as oil stains on the surface and inside of the sensor, which interferes with the normal operation of the sensor.

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