Mobile Robot Control Weighting for Communication Delay Stability

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Solution Overview

Problem

Communication delays between remote control systems and mobile robots increase the risk of accidents and user dissatisfaction due to unstable operation and sudden mode changes in autonomous driving systems.

Innovation Solution

A control method that combines remote control values and autonomous driving values, adjusting their weights based on communication delays and environmental factors to generate a target control value, stabilizing the operation and minimizing mode changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If autonomous driving mode is activated when communication delay exceeds threshold, then safety risk is reduced, but operation stability deteriorates due to sudden mode changes

Engineering Contradiction:
ImprovesafetyVSAvoidoperation stability
Core Design Contradiction:
ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent implements dynamic mode switching between autonomous and manual control modes based on real-time communication delay detection. When delay exceeds threshold, the system transitions from autonomous to manual mode, and vice versa. This dynamic adaptation resolves the contradiction by making the control mode flexible rather than fixed, improving safety through timely mode changes while maintaining operation stability through smooth transitions and continuous control value generation during mode switching.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The system changes the control parameter from autonomous-generated values to operator-input values based on communication delay conditions. By monitoring delay parameters and adjusting control authority accordingly, the system resolves the contradiction between safety (requiring autonomous mode) and operation stability (requiring consistent control mode). The parameter change approach allows the system to adapt control strategy to current communication conditions while maintaining continuous and stable robot operation.

Inventive Principle:
Principle #35Parameter changes

2Ease of operation

If remote control is used, then user control authority is maintained, but response time increases due to communication delay

Engineering Contradiction:
Improveuser control authorityVSAvoidresponse time
Core Design Contradiction:
Ease of operationVSLoss of time

Solution Approach 1:

The patent dynamically adjusts control authority between operator and autonomous system based on communication delay. When delay is acceptable, full remote control authority is maintained. When delay exceeds threshold, control authority dynamically shifts to autonomous mode, reducing response time while preserving user authority in normal conditions. This resolves the contradiction by making control authority adaptive rather than static.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The autonomous driving module acts as an intermediary between the operator and mobile robot when communication delay occurs. Instead of direct operator-to-robot control, the autonomous module mediates by generating control commands locally, reducing response time while the operator retains supervisory authority. This intermediary approach resolves the time delay issue while maintaining user control authority through hierarchical control structure.

Inventive Principle:
Principle #24Intermediary (Mediator)

Data Source

PatentUS11845188B2Method of controlling mobile robot, apparatus for supporting the method, and delivery system using mobile robot
Publication Date: 2023.12.19 DOGUGONGGAN CO LTD
  • US11845188B2 patent drawing
  • US11845188B2 patent drawing
  • US11845188B2 patent drawing

AI summary

Provided are a method of controlling a mobile robot, apparatus for supporting the method, and delivery system using the mobile robot. The method, which is performed by a control apparatus, comprises acquiring a first control value for the mobile robot, which is input through a remote control apparatus, acquiring a second control value for the mobile robot, which is generated by an autonomous driving module, determining a weight for each control value based on a delay between the mobile robot and the remote control apparatus and generating a target control value of the mobile robot in combination of the first control value and the second control value based on the determined weights, wherein a first weight for the first control value and a second weight for the second control value are inversely proportional to each other.