Capacitive Swing Sensing for Smooth Child Motion Control
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Solution Overview
Problem
Existing child motion devices lack operational adjustability and customization options, leading to inefficacy in soothing or entertaining children due to inaccurate and inefficient control techniques, which result in bumpy motion and rapid battery depletion.
Innovation Solution
The implementation of capacitive sensing technologies for absolute swing angle sensing and automated self-calibration routines, along with user-defined modes and motor voltage optimization, to provide a secure, comfortable, and adaptable motion control system that adjusts power application based on real-time position data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional control techniques are used in child motion devices, then the device can operate with simple electronics, but the motion becomes bumpy and jolting, reducing reliability
Solution Approach 1:
The patent implements feedback control by continuously monitoring swing position and velocity, then adjusting motor output accordingly. Sensors detect actual swing parameters and feed this information back to the controller, which modifies power application to maintain smooth motion. This closed-loop approach eliminates the bumpy, jolting motion characteristic of open-loop conventional systems.
Solution Approach 2:
The patent replaces simple mechanical timing mechanisms with electronic sensing and control systems. Instead of using mechanical cams or linkages to control swing timing, the system uses capacitive sensors, microcontrollers, and electronic motor control to achieve precise, smooth motion regulation.
2Duration of action of stationary object
If conventional control techniques are used, then the device structure remains simple, but battery depletion occurs rapidly due to inefficient operation
Solution Approach 1:
The patent applies power to the motor in periodic pulses synchronized with the swing cycle rather than continuous operation. The controller timing power application to specific phases of the swing arc, applying power during the return stroke when it assists gravity and coasting during the forward swing. This periodic action reduces average power consumption while maintaining swing momentum.
Solution Approach 2:
The system dynamically changes motor voltage and current parameters based on real-time swing conditions. The controller adjusts power delivery parameters (voltage, current, pulse width) according to swing position, velocity, and load conditions, optimizing energy efficiency across different operating states rather than using fixed parameter operation.
3Adaptability or versatility
If the device lacks operational adjustability, then the design remains simple, but it becomes ineffective for children outside a narrow weight range
Solution Approach 1:
The patent implements dynamic adaptation where the control system automatically adjusts operating parameters based on detected swing characteristics that correlate with occupant weight. The system monitors swing period, amplitude, and velocity patterns, then dynamically modifies motor torque, power pulse duration, and control gains to optimize performance for different weight ranges without requiring manual configuration.
Solution Approach 2:
The device performs self-calibration and self-adjustment through automated routines that detect swing parameters and configure control settings accordingly. The system autonomously adapts to different occupants by monitoring swing characteristics and adjusting motor control parameters without user intervention, eliminating the need for manual weight-based configuration.
4Adaptability or versatility
If manual calibration is required for each child, then the device can be customized, but setup time and complexity increase significantly
Solution Approach 1:
The patent implements preliminary automated calibration routines that perform all necessary adjustments during initial startup or when triggered by detected changes in swing characteristics. The system pre-configures optimal control parameters by automatically measuring swing period, amplitude, and velocity, then storing these calibrated settings for future use, eliminating the need for repeated manual calibration for each child.
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
This solution enhances the reliability and efficiency of child motion devices, ensuring a consistent and soothing experience across a wide range of conditions while minimizing setup challenges and extending battery life.
Implementation Method 1
the sensor assembly includes a capacitive sensor board spaced from a conductive disk coupled to the drive system. Motion of the swing causes changes in a capacitance signal between the sensor board and the conductive disk
Data Source
AI summary
A child motion device includes a motor to drive motion, a capacitive sensor array responsive to the motion to generate feedback information indicative of the motion, a control circuit coupled to the capacitive sensor array to control the motor based on the feedback information, and a user interface having a capacitive sensor element configured to recognize operator interaction with the user interface. The control circuit is coupled to the capacitive sensor element to control operation of the child motion device in accordance with the operator interaction. With the control circuit coupled to both the capacitive sensor array and the capacitive sensor element, the same control circuitry can be utilized in connection with both user interface and motor control functions.