Controlling method and device of range hood constant air volume

Abstract

The invention relates to a controlling method and device of a range hood constant air volume, The method is characterized in that a corresponding relation curve between the air outlet volume and the power of a range hood is built, the to-be-outputted air volume is converted into a success rate, the power adjustment is carried out by using a power PI loop and the current adjustment is carried out by using a current PI loop, and the constant air volume control is achieved; coordinate transformation is carried out on the sampled counter electromotive force, transformed output signals are dividedinto three paths, the first output signal serves as an input signal of an angle estimation unit for conducting angle estimation, the second output signal serves as an input signal of the power calculation unit, and the third output signal serves as a feedback input signal of the current PI loop. The output of the power PI loop is used as the current reference input of the current PI loop, and PI adjustment is carried out on the output of the power PI loop and the signal after PARK conversion, so that the error between the output of the power PI loop and the signal after PARK conversion is close to 0, the voltage is converted into a PWM duty ratio signal of a range hood motor through a linear module SVM to drive the range hood motor to operate, and a closed-loop constant air volume controlling loop is formed. The controlling method and device of the range hood constant air volume has the characteristics of low cost, high reliability and the like.

Description

technical field [0001] The invention relates to a method and device for controlling the constant air volume of a hood, and belongs to the technical field of household appliances. Background technique [0002] With the acceleration of the urbanization process, the range hood has become a must-have electrical appliance for every urban resident's kitchen. Its main function is to quickly suck away the harmful gas generated during the cooking process and discharge it outdoors to purify the kitchen air. Keep your kitchen safe. [0003] During the use of the range hood, the wind resistance of the air duct is not constant. If no proper control method is adopted, the change of the wind resistance will change the value of the air volume and affect the ventilation effect. [0004] Many range hoods now adopt a constant air volume control scheme. As the air pressure changes at the air outlet and air inlet of the range hood or the wind resistance of the air duct changes, the motor of the...

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