Infrared Cargo Control System for Aircraft ULD Positioning
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Solution Overview
Problem
The existing cargo loading systems in aircraft require numerous local control panels (LCPs) that limit the operators' visibility and mobility, making it difficult to precisely position and move unit load devices (ULDs) within the cargo compartment due to fixed viewing constraints.
Innovation Solution
A cargo loading system that employs wireless remote control handsets emitting coded infrared light signals to control power drive units (PDUs) via a wired network, eliminating the need for numerous LCPs and allowing operators to control PDU activation from a more flexible and advantageous position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If numerous local control panels (LCPs) are installed throughout the cargo compartment, then operators can control PDU activation at various locations, but this increases device complexity, installation costs, weight, and limits operator visibility and mobility
Solution Approach 1:
The control functionality is extracted from multiple distributed LCPs and consolidated into a single MCP. The MCP is mounted on the cargo door where it provides unobstructed visibility of the entire cargo compartment while eliminating the need for numerous LCPs throughout the compartment, thereby resolving the contradiction between operator mobility and device complexity
Solution Approach 2:
The MCP serves as a universal control station that can control any PDU in the cargo compartment through the wired network. This multi-functional capability replaces the need for location-specific LCPs, allowing operators to control the entire system from a single position that optimizes visibility and mobility
2Reliability
If numerous local control panels (LCPs) are installed throughout the cargo compartment, then control coverage is improved, but this increases installation costs and weight
Solution Approach 1:
Control functionality is extracted from multiple heavy LCP units and consolidated into a single MCP. The MCP maintains comprehensive control coverage through wireless or networked communication with all PDUs, eliminating the weight of numerous distributed control panels while preserving system reliability
Solution Approach 2:
The physical presence of multiple LCPs throughout the cargo compartment is replaced by a single MCP combined with electronic communication networks. This substitution maintains control coverage through digital signaling rather than physical proximity, significantly reducing the weight of stationary control equipment
3Ease of operation
If numerous local control panels (LCPs) are installed throughout the cargo compartment, then control accessibility is improved, but this increases personnel requirements
Solution Approach 1:
Control accessibility is extracted from multiple physical locations and consolidated into a single optimized MCP position on the cargo door. This centralization improves accessibility by providing unobstructed views of the entire cargo compartment while reducing the need for multiple operators to monitor different locations simultaneously
4Reliability
If wired network connections are used to connect PDUs to the controller, then system reliability is improved, but this increases installation complexity
Solution Approach 1:
The wired network infrastructure is installed during the preliminary aircraft assembly process, utilizing existing aircraft wiring harnesses and communication buses. This preliminary action integrates the PDU communication network into the aircraft's overall electrical system, reducing installation complexity while maintaining the reliability benefits of wired connections
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 operational efficiency and safety by reducing installation costs, weight, and personnel requirements, while providing better visibility and control over ULD movement, enabling precise positioning and movement of cargo without the need for fixed control panel locations.
Implementation Method 1
Infrared communication system for activating power drive units in an aircraft cargo loading system
Implementation Method 2
a light detector coupled to a PDU processor and configured to receive and process an incoming light signal
Data Source
AI summary
An air cargo loading system also includes a controller, a main control panel and a plurality of PDUs (PDUs), at least the controller and the PDUs being connected by a wired network. Each PDU has a motor, at least one driver roller element coupled to said motor, a light source, a light detector, and a processor. The light detector of each PDU is configured to receive and process an incoming coded light signal from a wireless remote control handset. The PDU's processor determines whether the received coded light signal is a valid command signal and, if so, provides a command information signal to the controller via the wired network. The controller decodes the command information signal and, in view of its knowledge of container locations, various switch settings and other status information, the controller then sends the appropriate control signals to turn on the required PDUs in response thereto. Because wireless remote handsets are used to communicate with the controller, the air cargo system may either be wholly devoid of local control panels or, have only a very small number of local control panels.