AMR Cart Docking with Reflective Orientation Sensing
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Solution Overview
Problem
Autonomous mobile robots (AMRs) face challenges in efficiently and safely docking with wheeled carts due to limitations in existing hooking mechanisms, which require precise cart orientation and positioning, and are hindered by issues like imperfect parking, heavy loads, and poor lighting conditions, leading to increased docking times and safety risks.
Innovation Solution
The implementation of a cart coupling system with elongated gripping elements, robot arms equipped with gripper hands, and an orientation control system using reflector units and light sensors to determine the AMR's orientation relative to the cart, allowing for improved docking accuracy and adaptability in various lighting conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a lifting mechanism is used to move the cart, then the cart can be transported, but the AMR speed is significantly limited and high power output is required
Solution Approach 1:
The patent replaces the lifting mechanism with a hooking mechanism that uses a robot arm to hook onto the cart's coupling structure. This substitution eliminates the need for high power output and speed limitations, allowing the AMR to move at normal speeds while still achieving cart transport through mechanical coupling rather than lifting.
2Reliability
If a hooking mechanism with fixed orientation is used, then the AMR can hook the cart, but quick docking is difficult when the cart is not perfectly parked
Solution Approach 1:
The patent makes the robot arm dynamic and adjustable in orientation, allowing it to adapt to carts that are not perfectly parked. The robot arm can move and position itself at different angles to achieve successful hooking, thereby reducing docking time while maintaining reliability even when carts are positioned imperfectly.
3Measurement precision
If optical sensors are used to determine AMR orientation, then position estimation can be obtained, but the sensors are limited by range, resolution, and lighting conditions
Solution Approach 1:
The patent introduces a coupling structure with a frame hitch and elongated gripping elements as an intermediary visual target on the cart. This coupling structure provides distinct geometric features that are easier for optical sensors to detect and track, improving position estimation precision and reducing sensitivity to lighting conditions by focusing detection on high-contrast structural elements rather than relying on ambient light.
4Ease of operation
If the AMR uses a basic compensatory controller for reverse movement, then the cart can be pushed into parking position, but safety risks increase when the cart is heavy or moves unexpectedly
Solution Approach 1:
The patent employs a robot arm to perform preliminary hooking and coupling actions before the AMR body engages in reverse movement. The robot arm establishes a secure mechanical connection in advance, allowing the compensatory controller to operate within safer parameters. This preliminary coupling action ensures that even if the cart is heavy or moves unexpectedly, the pre-established mechanical connection provides better control and safety.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the speed, efficiency, and safety of AMR docking with wheeled carts, enabling docking in difficult positions and reducing computational power requirements, thus improving navigation and reducing operating costs.
Implementation Method 1
an orientation control system using reflector units and light sensors to determine the AMR's orientation relative to the cart
Data Source
AI summary
Autonomous or automated mobile robots can be configured for transport and logistics applications. Systems for docking of such robots with wheeled carts can be used in methods for operation of such robots.