Electric Wheelchair Dynamic Suppression Zone Control
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Solution Overview
Problem
Existing mobile bodies, such as electric wheelchairs, face a mismatch between the speed suppression set by the upper limit speed setting device and the occupant's intended speed, especially when stationary objects like plants are detected near the travel path, leading to a gap between the actual and intended travel speeds.
Innovation Solution
A mobile body with a reduced suppression area setting mechanism that adjusts the suppression area based on the occupant's intention and the type of detected objects, allowing for a more precise control of speed suppression and release, thereby aligning the actual travel speed with the intended speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a mobile body with a battery, drive wheel, and control unit is designed to autonomously follow a guide line, then automation and productivity are improved, but the device complexity increases due to multiple sensors and control mechanisms
Solution Approach 1:
The mobile body is designed to perform multiple functions: it follows guide lines, detects obstacles, avoids collisions, and can be controlled remotely. By integrating these functions into a single platform with modular sensors and control systems, the patent achieves high automation without excessive complexity through functional consolidation and standardized components
2Weight of moving object
If the mobile body is designed to be small and lightweight for easy navigation, then ease of operation and adaptability are improved, but the battery capacity and power are reduced
Solution Approach 1:
The patent employs lightweight materials such as carbon fiber reinforced plastics and aluminum alloys to reduce body weight while maintaining structural integrity. The battery capacity is optimized by using high-energy-density lithium-ion batteries and strategically positioning them to balance the center of gravity, achieving a compromise between weight reduction and power supply adequacy
3Measurement precision
If multiple sensors and detection devices are added to improve navigation and obstacle detection, then measurement precision and reliability are improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The detection system is segmented into specialized sensors for different functions: optical sensors for guide line detection, ultrasonic sensors for obstacle detection, and inertial sensors for position measurement. Each sensor module is independently optimized and can be selectively activated based on operational needs, reducing overall system complexity while maintaining high measurement precision for each specific task
Data Source
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AI summary
The purpose of the present invention is to suppress travel of a mobile body, reflective of the intentions of a passenger, in a mobile body for which travel is suppressed on the basis of a detected object around the mobile body, in order to reduce collisions between the mobile body and a detected object around the mobile body. In the present invention, a control device of an electric wheelchair is provided with: a standard suppression region setting unit that sets a standard suppression region to serve as a standard, the standard suppression region being a suppression region in which travel of the electric wheelchair is suppressed when a detected object detected by a detecting device is positioned within the region; and a reduced suppression region setting unit that sets, on the basis of an intention of the passenger or the type of a detected object located in a peripheral region, which is a region on both sides of a predicted travel region of the electric wheelchair 1, a reduced suppression region, which is a suppression region that has been reduced in size, in respect to the standard suppression region set by the standard suppression region setting unit.