Vacuum cleaner control method
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Solution Overview
Problem
Existing vacuum cleaner control methods struggle to automatically sense and distinguish between different types of nozzles using the same type of motor, especially when nozzles are replaced during operation, requiring separate sensing means and facing challenges with current value deviations.
Innovation Solution
A control method that analyzes the current profile of the nozzle connected to the vacuum cleaner using a fixed pulse width modulation (PWM) scheme to determine if a nozzle is removed or re-connected, and distinguishes nozzle types based on starting current profiles, which include varying revolutions per minute and the presence of an auxiliary controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current characteristic analysis is used to distinguish nozzle types, then motor type differentiation is possible, but separate sensing means are required when motors of the same type are used
Solution Approach 1:
The nozzle performs self-identification by analyzing its own starting current profile characteristics. The control unit detects nozzle type through the unique current signature generated during motor startup, eliminating the need for external sensing means. Each nozzle type produces a distinct current profile pattern that the controller can recognize and use for automatic configuration.
2Measurement precision
If current value measurement is used for nozzle distinction, then motor type can be identified, but large deviation of current values prevents reliable distinguishment
Solution Approach 1:
The system transitions from measuring absolute current values to analyzing the temporal pattern and shape of the starting current profile. By focusing on characteristic features such as the rate of current rise, peak current timing, and profile shape during the startup phase, the system achieves reliable nozzle differentiation that is independent of absolute current value variations.
3Extent of automation
If nozzle distinction is performed only at vacuum cleaner startup, then initial nozzle type can be identified, but nozzle replacement during operation is not detected
Solution Approach 1:
The control unit continuously monitors the starting current profile every time the nozzle motor attempts to start, not just during initial vacuum cleaner startup. This continuous preliminary detection enables the system to identify nozzle type changes immediately when they occur, allowing real-time adaptation to nozzle replacements during operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables automatic sensing and adjustment of nozzle operation based on type, reduces the need for separate sensing means, and minimizes current value deviations, providing user convenience and effective nozzle management.
Implementation Method 1
A control method that analyzes the current profile of the nozzle connected to the vacuum cleaner using a fixed pulse width modulation (PWM) scheme
Data Source
AI summary
The present disclosure provides a control method capable of, by using a current value of a nozzle, determining whether a nozzle is separated from a vacuum cleaner and whether the nozzle is reconnected to the vacuum cleaner after separation. To this end, a vacuum cleaner may comprise a nozzle connectable to a suction unit for suctioning dusts. The nozzle may comprise a rotary cleaning unit for applying pressure to a cleaning target surface so as to separate a foreign substance therefrom, and a nozzle motor for driving the rotary cleaning unit. In order to drive the nozzle, a voltage having been controlled by a pulse width modulation (PWM) method is applied, and a measurement unit included in the vacuum cleaner may measure a current value of the nozzle, the current value depending on the applied voltage.