Electric Toothbrush Current-Based Overpressure Detection
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Solution Overview
Problem
Existing electric toothbrushes face challenges in accurately detecting and preventing overpressure, as the current draw can vary due to brush head characteristics and wear, making it difficult to set an appropriate threshold for overpressure detection.
Innovation Solution
An electric oral-care implement with a pressure-control system that dynamically adjusts a baseline current by measuring and adjusting the motor current draw, allowing for real-time detection of overpressure and implementing corrective actions such as slowing the motor or generating signals to reduce pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed current threshold is used for overpressure detection, then the detection method is simple, but the detection accuracy deteriorates due to variations in brush head characteristics and wear
Solution Approach 1:
The patent implements a dynamic baseline current that automatically adjusts based on the actual motor current draw during operation. Instead of using a fixed threshold, the system continuously adapts the baseline to account for variations in brush head characteristics, wear, and operating conditions, thereby maintaining accurate overpressure detection across different scenarios
Solution Approach 2:
The system employs feedback by monitoring the motor current draw and using it to adjust the baseline current dynamically. The controller continuously compares the measured current against the adaptive baseline and modifies the baseline based on observed operating patterns, creating a self-adjusting detection system that improves accuracy without requiring complex manual calibration
2Object-affected harmful factors
If the motor is slowed down to prevent overpressure damage, then gum damage is prevented, but brushing productivity decreases
Solution Approach 1:
The patent implements periodic pulsing action where the motor is alternately activated and deactivated based on pressure detection. When overpressure is detected, the motor is pulsed off briefly and then restarted, creating a rhythmic on-off pattern that prevents continuous damage while maintaining overall brushing progress and efficiency
Solution Approach 2:
The system takes preliminary anti-action by detecting overpressure conditions and immediately responding with corrective action (slowing or stopping the motor) before significant gum damage can occur. This preventive approach minimizes harmful effects while maintaining productivity by only reducing speed when necessary
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
Effectively manages overpressure by dynamically adjusting the baseline current, providing accurate detection and remedial actions to prevent gum damage and maintain effective brushing performance.
Implementation Method 1
an electric motor housed therein... The motor in the toothbrush handle controls movement of the functional element
Implementation Method 2
the current draw from an electric motor in a toothbrush varies proportionally to the amount of pressure applied to the brush head
Data Source
AI summary
A method for controlling overpressure in an electric oral-care implement having a treatment head with at least one functional element driven by a motor. The method includes detecting a stimulus to energize the motor, setting a baseline current, and repeatedly execute an overpressure-detection control loop, said loop including measuring the motor's instantaneous current draw, adding an increment value to the baseline current or subtracting a decrement value from the baseline current thereby generating a dynamically adjusted baseline current, determining whether a difference between the instantaneous current draw and the dynamically adjusted baseline current exceeds a threshold thereby detecting an occurrence of overpressure, and performing a corrective action in response to the detected occurrence of overpressure.