Autonomous Cart Charging Alignment and Fault Detection
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Solution Overview
Problem
Autonomous robots in industrial environments face challenges in efficient and safe charging, as existing systems lack advanced sensors and adaptive charging mechanisms to ensure proper electrical connections and fault detection, leading to potential damage or inefficiencies.
Innovation Solution
A charging system for autonomous robots that includes sensors like magnetic and Hall effect sensors, a processor for current modulation, and a resilient member for secure contact, along with a visual target for navigation, to ensure safe and efficient charging by monitoring the robot's state of charge and adapting the charging process based on resistance and fault detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If advanced sensors and adaptive charging mechanisms are added to ensure proper electrical connections and fault detection, then charging safety and reliability are improved, but device complexity increases
Solution Approach 1:
The voltage sensing element measures voltage at the electrical contact before charging begins to detect high resistance conditions. The sensor detects the robot's position before charging starts. These preliminary detections prevent unsafe charging conditions from developing, improving reliability without requiring complex real-time control systems throughout the charging process.
Solution Approach 2:
A voltage sensing element acts as an intermediary between the power supply and the charging element. It monitors electrical conditions and provides feedback about connection quality, enabling fault detection without requiring direct complex interaction between all system components. This intermediary approach simplifies the overall system architecture while maintaining high reliability.
2Reliability
If the charger continuously monitors voltage and current to detect faults and high resistance, then charging reliability is improved, but energy consumption increases
Solution Approach 1:
The voltage sensing element performs periodic voltage measurements at the electrical contact during charging rather than continuous monitoring. The sensor periodically checks the robot's position and charging conditions. This periodic approach maintains adequate fault detection capability while significantly reducing energy consumption compared to continuous monitoring, resolving the contradiction between reliability and energy use.
3Reliability
If the resilient member applies constant force to maintain electrical contact, then connection reliability is improved, but mechanical wear increases
Solution Approach 1:
The resilient member provides dynamic, elastic force rather than rigid constant force. The elastic element naturally adjusts its force output based on the contact conditions and wear over time, maintaining adequate electrical connection pressure without requiring active control. This dynamic approach reduces mechanical stress and extends component lifespan while maintaining connection reliability.
Solution Approach 2:
The resilient member changes its mechanical properties through elasticity, allowing the contact force to vary naturally with compression and wear. This parameter change enables the system to maintain reliable electrical contact over extended periods without the force becoming excessively high, thereby reducing mechanical wear and extending the duration of component action.
4Loss of information
If the processor modulates current to transmit information during charging, then communication capability is improved, but charging speed may be reduced
Solution Approach 1:
The processor modulates current at low levels to transmit information during charging. This partial action approach uses minimal current modulation specifically for communication purposes while maintaining the overall charging current at high levels. The information transmission requires only small current variations, so the bulk charging speed is preserved while still achieving bidirectional communication between charger and robot.
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
The system enables autonomous robots to safely and efficiently recharge by ensuring proper electrical connections, preventing damage from high resistance or faults, and optimizing charging through adaptive current modulation, thereby enhancing operational reliability and safety.
Implementation Method 1
The sensor may include a magnetic sensor, such as a passive Reed switch or an active Hall effect sensor, that senses a magnet in or on the autonomous robot.
Implementation Method 2
The sensor may include a magnetic sensor, such as a passive Reed switch or an active Hall effect sensor, that senses a magnet in or on the autonomous robot.
Implementation Method 3
The charger may also include a voltage sensing element, in electrical communication with the power supply, to measure a voltage at an electrical contact of the autonomous robot. This voltage can be used to determine the resistance of electrical connection between the autonomous robot and the charging element.
Data Source
AI summary
An autonomous robot moves materials in a warehouse or other industrial environment. It runs on an electric motor powered by a rechargeable battery. When its battery becomes depleted, it maneuvers to a nearby charger. It guides itself to the charger using visual cues, such as a target on or near the charger, until it establishes a good electrical connection with the charger. Proximity sensors on the charger and/or the autonomous robot determine if the autonomous robot is positioned properly; if so, the charger begins charging the autonomous robot's battery. While charging, the charger monitors the resistance of the electrical connection for open- or short-circuit conditions. It also monitors the status of the proximity sensors. If the charger detects an open-circuit or a short-circuit or that the autonomous robot has moved away from the charger, the charger stops charging.