Vacuum Cleaner Acceleration Sensor Control for Lifted Nozzle Detection
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Solution Overview
Problem
Existing cleaners, particularly handy-type cleaners, face challenges in accurately determining a user's intention for adjusting suction power and brush speed during cleaning, leading to inefficient cleaning and potential safety hazards when the suction nozzle is lifted.
Innovation Solution
A cleaner equipped with an acceleration sensor to detect movements along three axes, allowing the controller to determine a stop motion of the suction nozzle and adjust the brush motor and suction motor accordingly, ensuring efficient cleaning and user safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the suction nozzle is lifted during cleaning, then the user can move the cleaner to different areas or navigate obstacles, but the brush motor and suction motor may continue to operate causing safety hazards and energy waste
Solution Approach 1:
The acceleration sensor continuously monitors the motion state of the suction nozzle and provides feedback to the controller. When the sensor detects that the suction nozzle is lifted (acceleration exceeds threshold), the controller automatically stops the brush motor and suction motor, eliminating the safety hazard while maintaining mobility
Solution Approach 2:
The patent replaces manual operation and mechanical switches with an acceleration sensor-based detection system. The sensor automatically identifies when the suction nozzle is lifted and triggers motor shutdown, substituting mechanical control with sensor-based intelligent control
2Loss of energy
If the user manually operates the cleaner to turn off motors when moving objects, then energy consumption is reduced, but user convenience is decreased and cleaning time is lost
Solution Approach 1:
The cleaner performs self-service by automatically detecting when the suction nozzle is lifted through the acceleration sensor and autonomously stopping the motors. This eliminates the need for manual user intervention, maintaining energy efficiency while improving convenience
Solution Approach 2:
The system uses acceleration sensor feedback to automatically determine when to stop motors, creating a closed-loop control system that reduces energy consumption without requiring user action
3Measurement precision
If the cleaner continuously monitors motion to identify user intention, then motor control accuracy is improved, but device complexity increases
Solution Approach 1:
The patent uses an acceleration sensor to replace complex mechanical switches or manual input devices. The sensor provides precise motion detection through electrical signals, improving measurement accuracy while actually simplifying the overall system structure
Solution Approach 2:
The system monitors acceleration parameter changes to infer user intention. By detecting changes in acceleration magnitude and direction, the controller accurately determines when the suction nozzle is lifted without requiring complex sensor arrays or processing systems
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
The solution enables the cleaner to reflect a user's intention by temporarily stopping motors and turning off the cleaner when necessary, improving user convenience, reducing energy consumption, and increasing the cleaner's usage time.
Implementation Method 1
an acceleration sensor installed on the suction nozzle and configured to sense accelerations along three axes that are orthogonal to each other in a spatial coordinate system
Data Source
AI summary
Provided is a cleaner including: a suction nozzle configured to suck in outside air; a brush motor configured to rotate a brush installed in the suction nozzle and sweeping up dust; a suction motor configured to generate a suction force of the suction nozzle; an acceleration sensor installed on the suction nozzle and configured to sense accelerations along three axes that are orthogonal to each other in a spatial coordinate system; a power supply unit configured to supply power to the brush motor and the acceleration sensor; and a controller configured to control the brush motor, the suction motor, and the power supply unit based on a variation of an x-axis acceleration provided by the acceleration sensor and a sum of acceleration variations which is obtained by summing variations of x-, y-, and z-axis accelerations provided by the acceleration sensor.