Standing Assist Device Adaptive Control for Chair Type
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Solution Overview
Problem
Existing standing motion assist devices provide a constant force and speed for standing assistance regardless of the type of chair, leading to unstable standing motions due to insufficient or excessive force application, depending on the chair's height and design.
Innovation Solution
A standing motion assist device equipped with sensors to measure posture and myoelectric potential information, which identifies the type of chair and adjusts the assistance force and speed accordingly, using a processor to control the support mechanism for tailored assistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant force and speed are provided for standing assistance regardless of chair type, then the device structure is simple, but the standing motion becomes unstable due to insufficient or excessive force application
Solution Approach 1:
The assistance force and speed are made dynamically adjustable based on detected chair type. The processor modifies the control parameters in real-time according to the detected chair characteristics, transitioning from a static constant-force system to a dynamic adaptive system that optimizes assistance for each chair type.
Solution Approach 2:
The physical parameters of the assistance (force magnitude and speed) are changed based on the detected chair type. Different chair types trigger different parameter settings in the control system, allowing the same device to provide appropriate assistance across varying sitting conditions without hardware modification.
2Use of energy by moving object
If the device provides constant assistance force regardless of chair type, then the control system is simple, but excessive energy is consumed due to unnecessary strong assistance
Solution Approach 1:
The system performs preliminary detection of chair type before providing standing assistance. By detecting the chair characteristics in advance (through sensors measuring seat height, firmness, or other parameters), the processor can pre-calculate the appropriate assistance parameters, avoiding energy-wasting trial-and-error adjustments during the actual standing motion.
Solution Approach 2:
The system uses sensor feedback about chair type to continuously adjust assistance parameters. The detection system provides real-time information about the chair characteristics, and the processor uses this feedback to optimize energy consumption by providing only the necessary assistance level for each specific chair type.
3Reliability
If the device provides constant assistance speed regardless of chair type, then the control mechanism is simple, but the standing motion becomes unstable due to mismatched speed assistance
Solution Approach 1:
The assistance speed parameter is changed according to the detected chair type. The processor adjusts the speed at which the support mechanism operates based on chair characteristics such as seat height and firmness, ensuring that the standing motion proceeds at an optimal pace for each specific sitting condition.
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 device provides stable standing assistance by matching the assistance force and speed to the chair type, preventing excessive energy consumption and extending battery life in battery-powered devices.
Implementation Method 1
a second sensor measuring myoelectric potential information including myoelectric potentials of the user and outputting the myoelectric potential information
Data Source
AI summary
A standing motion assist device includes a support mechanism attached to a leg of a user to assist the user with motion, a sensor including first and/or second sensors that measure and output posture information and myoelectric potentials of the user, respectively, the sensor outputting measurement data including first measurement data measured after a sitting motion of the user sitting in a chair starts and second measurement data measured after the sitting motion ends, a memory that stores the measurement data, and a processor that controls the support mechanism. The processor detects the sitting motion and identifies the chair type based on the first measurement data, detects the start of a motion of the user standing from the chair based on the second measurement data, and outputs assist information corresponding to the identified chair type and used by the support mechanism to assist the user with standing.