Power Wheel Assist Control for Adaptive User Force Response
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Solution Overview
Problem
Conventional power assistive devices fail to intuitively and actively respond to changes in user force, leading to potential dangerous operations or inadequate protection due to the inability to determine the strength of the user's force.
Innovation Solution
An electric assistive device with a power control module that adaptively generates vehicle speed parameters based on dynamic characteristic and force estimation parameters, using equations to determine force and adjust motor rotation speed accordingly, enabling adaptive driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional power assistive devices directly control motor rotation speed based on external commands, then the control system is simple, but the device cannot determine user force strength and cannot intuitively respond to changes in user force
Solution Approach 1:
The patent implements a feedback mechanism where the power control module continuously monitors the force applied by the user through the relationship between motor torque and rotation speed, and adjusts the motor output accordingly. The control module receives force information from sensors and feeds it back to adaptively adjust the driving force, enabling the system to respond intuitively to user force changes without requiring complex additional measurement hardware.
Solution Approach 2:
The patent replaces complex mechanical force measurement mechanisms with an electrical control approach. Instead of using sophisticated mechanical force sensors, the system uses the motor's electrical characteristics (current, voltage, rotation speed) to infer user force through control algorithms, substituting mechanical measurement with electrical sensing and computational estimation.
2Adaptability or versatility
If the device uses adaptive driving control based on multiple parameters, then the adaptive driving performance is improved, but the control algorithm complexity increases
Solution Approach 1:
The patent achieves adaptive driving by dynamically adjusting motor control parameters (rotation speed, torque, voltage) based on detected user force and operational conditions. The power control module modifies these parameters in real-time according to the relationship F = k × ω, where force estimation is derived from measurable electrical parameters, allowing the system to adapt to different user needs and environmental conditions through parameter optimization rather than structural complexity.
Data Source
AI summary
An electric assistive device is provided. The electric assistive device includes a power wheel module, an upper control module, and a power control module. The upper control module is configured to provide a dynamic characteristic parameter. The power control module is coupled to the power wheel module and the upper control module. In response to operating the electric assistive device in an auxiliary walking mode, the power control module adaptively generates a first vehicle speed parameter according to a dynamic characteristic parameter and a force estimation parameter. The power control module generates a voltage control signal according to the first vehicle speed parameter. The power control module drives the power wheel module according to the voltage control signal.