Independent Cart Orientation Sensing for Closed-Loop Actuation
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Solution Overview
Problem
In independent cart systems, variations in manufacturing tolerances, wear, and loading conditions lead to inconsistencies in the orientation of movers along a track, making precise real-time orientation of carts or devices mounted on them challenging, especially when interacting with external actuators or stations.
Innovation Solution
A system comprising sensors, control circuits, and transmitters mounted on each cart to generate and transmit feedback signals regarding their physical orientation, using multi-axis integrated circuits to determine roll, pitch, and yaw, and communicate this information wirelessly to external controllers for closed-loop control and precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors and transmitters are mounted on each cart to provide real-time orientation data, then measurement precision and adaptability are improved, but device complexity increases
Solution Approach 1:
The system divides the orientation measurement function into independent modular units by mounting complete sensor assemblies (including sensors, control circuits, and transmitters) on each individual cart. This segmentation allows each cart to autonomously provide real-time orientation data without affecting other carts, resolving the contradiction by enabling high measurement precision through distributed sensing while managing complexity through modularity.
Solution Approach 2:
The system implements real-time feedback by continuously monitoring cart orientation through sensors and transmitting this data to external controllers. The feedback loop enables dynamic compensation for orientation variations caused by manufacturing tolerances, wear, and loading conditions, improving measurement precision while the automated nature of the feedback reduces operational complexity.
2Adaptability or versatility
If real-time orientation data is transmitted from each cart to external controllers, then adaptability and control precision are improved, but use of energy increases
Solution Approach 1:
The system employs periodic transmission of orientation data rather than continuous transmission, where sensors monitor cart orientation continuously but transmit data at predetermined intervals or when orientation changes exceed thresholds. This periodic action maintains real-time control adaptability by providing timely updates while significantly reducing energy consumption compared to continuous transmission.
Solution Approach 2:
The system dynamically adjusts transmission parameters such as data transmission intervals and communication power levels based on cart position, speed, and orientation stability. When carts are stable and moving at constant speeds, transmission frequency is reduced to conserve energy, while transmission intensity increases when precise orientation control is needed during interactions with external actuators, resolving the contradiction between adaptability and energy consumption.
Data Source
AI summary
A system and method of determining orientation of a physical location on a cart or end effector located on the cart in an independent cart system receives a feedback signal from a sensor on the cart. A multi-axis device may generate three or more signals corresponding to X, Y, and Z axes orientations. Processing may be performed on the signals to generate a value of yaw, pitch, or roll of the cart. The feedback or processed signals are transmitted from the mover to a remote device external from the track. The real-time orientation information may be used to implement closed-loop control of an actuator mounted on or external to each cart as the cart travels along the track. Power for the devices on the mover may be provided by a battery mounted on the cart or by a wireless power transfer system.