| 摘要 |
<p>An electric vacuum cleaner includes a main body having an electric blower and a dust collecting chamber, a triac for controlling the electric blower, a floor nozzle coupled to the main body, an electric current sensor for sensing electric current in a rotary brush driving motor in the floor nozzle, and a microcomputer. The microcomputer detects a period of variation of the motor current and the maximum electric current value for every predetermined period on the basis of an output from the electric current sensor, performs fuzzy inference on the detected values, and determines the duty cycle of the blower control triac on the basis of a result of it. Supply of electric power to the electric blower according to using conditions of the floor nozzle and kinds of a floor surface is realized by this. <IMAGE></p> |
