Mobility Device Stability Control via Inertial Sensing
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Solution Overview
Problem
Existing mobility devices for physically disabled individuals often compromise between stability and ease of locomotion, particularly when navigating stairs or uneven terrain, and lack advanced safety features and payload capacity.
Innovation Solution
A lightweight, redundant mobility device with an inertial measurement system, advanced heat management, ergonomically positioned shock-buffered caster wheels, automatic mode transitions, remote control capabilities, and a vehicle locking mechanism, along with long-lived batteries and ride management bumpers, to enhance stability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stability features are enhanced to maintain balance on uneven terrain, then reliability improves, but device complexity increases
Solution Approach 1:
The control system is divided into multiple independent modules including inertial measurement unit, processing unit, and motor control units. Each module performs specific functions independently, allowing the system to maintain stability through distributed control while keeping individual components manageable and replaceable.
Solution Approach 2:
The system continuously monitors orientation and predicts potential instability conditions before they occur. The control algorithm proactively adjusts motor commands to prevent tipping or loss of balance, rather than reacting after instability begins, thereby enhancing reliability through preventive control.
2Reliability
If redundant components are added to enhance safety and reliability, then reliability improves, but weight increases
Solution Approach 1:
Multiple sensor inputs from the inertial measurement unit are processed by a single integrated processing unit that coordinates all redundancy systems. The control system merges information from multiple sources to make unified control decisions, achieving enhanced reliability without proportionally increasing overall system weight.
Solution Approach 2:
The system dynamically adjusts operational parameters such as motor power distribution and stability thresholds based on real-time sensor data. By changing control parameters rather than adding physical components, the system achieves adaptive safety responses without increasing weight.
3Measurement precision
If advanced control systems with multiple sensors are implemented, then measurement precision improves, but device complexity increases
Solution Approach 1:
The processing unit performs multiple functions including sensor data acquisition, orientation calculation, stability prediction, and motor control command generation. This multi-functional approach allows precise orientation measurement while consolidating control logic into a single unit, preventing exponential growth in system complexity.
4Adaptability or versatility
If the device is designed to accommodate increased payload, then versatility improves, but weight increases
Solution Approach 1:
The control system dynamically adjusts motor output and stability parameters based on detected payload conditions. The inertial measurement unit identifies changes in center of gravity and mass distribution, and the processing unit adapts control commands in real-time, allowing the device to handle varied payloads without requiring heavy structural reinforcement.
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 mobility device provides improved stability, safety, and performance, enabling users to navigate various terrains and obstacles while accommodating increased payloads and offering enhanced user control and convenience.
Implementation Method 1
an inertial measurement system
Implementation Method 2
determining the corrective action to maintain stability
Implementation Method 3
ergonomically positioned and shock buffered caster wheel assemblies
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A powered balancing mobility device that can provide the user the ability to safely navigate expected environments of daily living including the ability to maneuver in confined spaces and to climb curbs, stairs, and other obstacles, and to travel safely and comfortably in vehicles. The mobility device can provide elevated, balanced travel.