Autonomous Forklift Pickup Using Force Feedback
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Solution Overview
Problem
Remote operators face challenges in precisely placing a vehicle's lift elements under objects, such as pallets, due to network delays and lack of force feedback, making it difficult to center the forks and avoid collisions during the pickup process in warehouse environments.
Innovation Solution
An autonomous vehicle system with local control capabilities uses sensors like force sensors and contact sensors to determine the correct positioning of lift elements under an object, allowing it to move along a determined approach path and lift the object once properly positioned, enabling precise and collision-free object pickup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If remote operators control the vehicle to pick up objects, then the vehicle can be operated without full automation, but network delays and lack of force feedback make it difficult to precisely place lift elements under objects
Solution Approach 1:
The autonomous vehicle performs the pickup operation independently using onboard sensors and control systems. The vehicle autonomously determines when lift elements are positioned under the object and executes the pickup without requiring continuous remote operator intervention, allowing the system to serve itself in the critical positioning and pickup phases.
Solution Approach 2:
The system uses force sensors and contact sensors to provide real-time feedback about the position of lift elements relative to the object. This feedback loop allows the control system to detect when lift elements are properly positioned under the object and to make precise adjustments, solving the positioning precision problem without relying on remote operator judgment.
2Reliability
If remote operators attempt to precisely center forks under objects, then pickup accuracy may improve, but network delays prevent real-time adjustment and increase collision risk
Solution Approach 1:
Force sensors and contact sensors provide immediate feedback about contact between lift elements and the object, enabling real-time detection of proper positioning. This local feedback eliminates the time delay inherent in remote monitoring and allows instantaneous response to positioning conditions, improving reliability without time loss.
Solution Approach 2:
The system replaces the mechanical/teleoperated control system with an autonomous sensor-based control system. Instead of relying on remote operators to judge positioning through delayed visual feedback, the system uses force sensors and contact sensors to directly detect physical contact conditions, substituting electronic sensing for human sensory-motor control.
3Measurement precision
If full autonomous control is implemented for object pickup, then precision and collision avoidance improve, but system complexity and sensor requirements increase
Solution Approach 1:
The autonomous vehicle uses its own onboard sensors and control systems to perform the positioning and pickup operations independently. The system serves itself by autonomously determining when lift elements are positioned under the object and executing the pickup, eliminating the need for complex remote operator interfaces and external monitoring systems.
Solution Approach 2:
The system employs force sensors and contact sensors that provide direct feedback about the physical state of the pickup operation. This feedback mechanism enables the control system to precisely determine when lift elements are properly positioned under the object and to execute the pickup with high precision, justifying the sensor complexity through the achieved positioning accuracy.
4Extent of automation
If remote operators control the pickup operation, then automation level is reduced, but system complexity decreases
Solution Approach 1:
The autonomous vehicle independently performs the pickup operation using onboard sensors and control systems. The vehicle autonomously determines when lift elements are positioned under the object and executes the pickup without requiring remote operator intervention, allowing the system to serve itself in the critical positioning and pickup phases.
Solution Approach 2:
Force sensors and contact sensors provide real-time feedback about the position of lift elements relative to the object, enabling autonomous control. This feedback loop allows the system to detect proper positioning and execute pickup automatically, achieving high automation while simplifying remote operation to mere supervision.
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 ensures accurate and efficient object pickup by using sensor data for precise navigation and lifting, reducing the reliance on remote operator precision and minimizing the risk of collisions, thereby enhancing the automation of warehouse operations.
Implementation Method 1
at least one horizontal force sensor configured to detect a horizontal force in a direction toward the side of the autonomous vehicle
Implementation Method 2
at least one vertical force sensor configured to detect a downward force on the one or more lift elements
Data Source
AI summary
An example method includes receiving instructions to pick up an object with one or more lift elements of an autonomous vehicle. Based on a current positioning of the vehicle, the method further includes identifying the object to be picked up and a particular side of the object under which to place the one or more lift elements of the vehicle. The method additionally includes determining an approach path toward the object for the vehicle to follow to place the lift elements of the vehicle under the particular side of the object. The method further includes causing the vehicle to move along the determined approach path toward the object. The method additionally includes determining that the lift elements of the vehicle are placed under the particular side of the object. The method also includes causing the vehicle to lift the object with the lift elements.