Mobile Robot Velocity Planning for Accurate Target Pose Reaching

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Solution Overview

Problem

Security patrol robots face challenges in accurately reaching target positions and attitudes due to limitations in their circular motion capabilities, especially when the steering radius is large and the robot is close to the target point.

Innovation Solution

A method for planning velocity that involves acquiring a target weight coefficient using a fuzzy controller, determining a motion central angle based on the current and target poses, and calculating a target angular velocity to comprehensively consider both position and attitude constraints, enabling real-time velocity planning for the robot to reach the target location and attitude.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the robot uses circular motion to trace the planned path, then the robot can move along a trajectory, but the robot cannot reach the target pose accurately when the steering radius is large and the robot is close to the target point

Engineering Contradiction:
Improvetarget pose accuracyVSAvoidcircular motion capability
Core Design Contradiction:
Measurement precisionVSEase of operation

Solution Approach 1:

The patent applies dynamics by making the motion model adjustable between circular motion and point-to-point motion. The system dynamically selects the appropriate motion mode based on the robot's distance to the target point and the required pose accuracy, allowing transition from circular motion at larger distances to direct positioning when close to the target, thereby resolving the contradiction between ease of circular motion operation and accuracy requirements.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent changes the motion parameters (steering radius, velocity profile) based on the robot's state and distance to target. By adjusting these parameters dynamically, the system can switch between circular motion patterns and direct positioning modes, enabling accurate target pose achievement while maintaining operational simplicity through parameter adaptation rather than complex structural changes.

Inventive Principle:
Principle #35Parameter changes

2Productivity

If the robot discretizes the planned trajectory into target points and traverses them, then the path tracing becomes manageable, but the robot cannot completely reach the target position and attitude through circular motion alone

Engineering Contradiction:
Improvepath tracing efficiencyVSAvoidtarget pose accuracy
Core Design Contradiction:
ProductivityVSMeasurement precision

Solution Approach 1:

The patent segments the path tracing task into two distinct phases: distant point traversal using circular motion for efficiency, and close-range positioning using direct point-to-point motion for accuracy. This segmentation allows the system to maintain high productivity during most of the journey while ensuring precise target pose achievement in the final stage, resolving the contradiction between traversal efficiency and final accuracy.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent applies partial action by using circular motion only for the portion of the trajectory where it is effective (distant points), and switching to direct positioning for the final approach where precision is critical. This partial use of circular motion maintains productivity while avoiding its limitation in achieving exact target pose, effectively resolving the contradiction between efficient traversal and accurate positioning.

Inventive Principle:
Principle #16Partial or excessive action

3Stability of the object's composition

If the robot has a large steering radius for stable motion, then the robot moves smoothly, but it becomes almost impossible to reach the target position and attitude when close to the target point

Engineering Contradiction:
Improvemotion stabilityVSAvoidtarget pose accuracy
Core Design Contradiction:
Stability of the object's compositionVSMeasurement precision

Solution Approach 1:

The patent makes the steering radius dynamic rather than fixed. The system uses a large steering radius for stable motion during distant traversal, then dynamically reduces the steering radius when approaching the target point to enable precise positioning. This dynamic adjustment resolves the contradiction between motion stability and target pose accuracy by adapting the steering characteristics to the current operational phase.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent changes the steering radius parameter based on the robot's distance to the target point. By reducing the steering radius parameter when close to the target, the system can achieve accurate positioning while maintaining smooth motion characteristics. This parameter adaptation resolves the contradiction between large-radius stability and small-radius precision without requiring structural modifications.

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentUS11334072B2Method and device for planning velocity of a mobile apparatus
Publication Date: 2022.05.17 CHONGQING XINGJIE SHUXING TECHNOLOGY PARTNERSHIP ENTERPRISE (LLP)
  • US11334072B2 patent drawing
  • US11334072B2 patent drawing
  • US11334072B2 patent drawing

AI summary

The present disclosure relates to a method, device, computer readable storage medium, and electronic device for planning velocity of a mobile apparatus. The method for planning velocity of a mobile apparatus provided by embodiments of the present disclosure comprises: acquiring a target weight coefficient according to a target linear velocity of the mobile apparatus; determining a motion central angle of the mobile apparatus according to a current pose, a target pose, and the target weight coefficient of the mobile apparatus; and calculating a target angular velocity of the mobile apparatus according to the motion central angle and the target linear velocity. The method for planning velocity of a mobile apparatus provided by embodiments of the present disclosure may realize real-time planning of velocity of the mobile apparatus to reach the target pose more accurately.