Intelligent Rollator Torque Control for Smooth Curb Crossing
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Solution Overview
Problem
Intelligent rollators face difficulties in smoothly transitioning over curbs due to excessive torque output caused by increased speed, leading to potential loss of control, especially on uneven terrain with high curbs.
Innovation Solution
A control method and device that adjust the torque output of the motor based on the rollator's attitude and speed, entering an intelligent crossing-curb mode to reduce torque when the front end is tilted upward, and increasing torque output when the rollator is partially over the curb to ensure smooth crossing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the motor torque output is increased to help the rollator get over curbs, then the rollator can overcome obstacles more effectively, but the rollator may lose control due to excessive torque when moving speed is high
Solution Approach 1:
The control method dynamically adjusts motor torque output based on real-time detection of moving speed and attitude (tilt angle). When the rollator is detected to be tilting upward at speeds below a first threshold, the system reduces torque output to prevent loss of control. When the rollator is partially over the curb, the system increases torque to complete the crossing. This dynamic adjustment resolves the contradiction by making torque adaptive to the current operational state rather than fixed.
Solution Approach 2:
The system changes the torque parameter based on detected conditions (speed and tilt angle). By monitoring these parameters and adjusting torque accordingly - reducing it during upward tilting at low speeds and increasing it when partially over the curb - the system optimizes both obstacle-crossing capability and control stability, resolving the technical contradiction between force output and reliability.
2Productivity
If the rollator moves at high speed to cross curbs quickly, then crossing efficiency is improved, but torque output increases causing loss of control
Solution Approach 1:
The control method implements feedback control by continuously detecting the rollator's moving speed and attitude, then adjusting torque output based on this feedback. When high speed is detected during upward tilting, the system reduces torque to maintain control stability. This feedback mechanism resolves the contradiction by preventing the harmful effect of excessive torque at high speeds while still allowing efficient crossing when conditions are appropriate.
Solution Approach 2:
The system applies preliminary anti-action by detecting the upward tilting attitude and high speed conditions before loss of control occurs, then preemptively reducing torque output to counteract the potential harmful effect. This preventive approach resolves the contradiction by addressing the control stability issue before it manifests, allowing efficient crossing while maintaining safety.
Data Source
AI summary
A control method for an intelligent rollator, and a control device, an intelligent rollator, a controller thereof. The intelligent rollator is configured with a vehicle body, a front wheel and rear wheels driven by a motor. The method includes the following steps: obtaining the moving speed of the intelligent rollator; obtaining the attitude of the intelligent rollator; and reducing the torque output of the motor, when the attitude indicates that the front end of the intelligent rollator is tilted upward, and the moving speed of the intelligent rollator is less than a first threshold. The intelligent rollator can determine whether it is necessary to enter an intelligent crossing-curb mode, in which the torque output of the motor is reduced, so as to prevent the vehicle body out of control due to the increase of torque caused by the too large speed when getting over curbs.