eVTOL Control System Multi-Field Data Frames for Lower Bus Traffic
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Solution Overview
Problem
The existing control systems in electric vertical take-off and landing aircraft (eVTOL) experience increased bus traffic and decreased communication speed due to the transmission of numerous data frames between controllers via control area network communication, which affects the efficient control of contactors and IGBTs.
Innovation Solution
A control system that reduces traffic on the bus by generating a single data frame with multiple sub-data fields for status information, allowing controllers to determine commands based on pre-allocated status information, thereby minimizing the number of data frames transmitted and received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate data frames are transmitted for each control signal, then each device receives complete control information, but bus traffic increases and communication speed decreases
Solution Approach 1:
The patent combines multiple control signals into a single data frame by dividing the data field into multiple sub-fields. Each sub-field contains control information for a different device, allowing simultaneous control of multiple devices through one transmission, thus reducing bus traffic while maintaining complete control information delivery
Solution Approach 2:
The data field within the data frame is segmented into multiple sub-fields, where each sub-field is allocated to a specific device. This segmentation allows the receiving device to efficiently extract only its relevant control information from the combined data frame, maintaining reliability while improving communication efficiency
2Reliability
If multiple separate data frames are transmitted for each control signal, then each device receives dedicated control information, but the number of data frames increases
Solution Approach 1:
Multiple device-specific control signals are merged into a single data frame with multiple sub-fields. Each sub-field maintains device-specific control information through dedicated allocation, reducing the quantity of data frames from multiple separate transmissions to a single combined transmission
Solution Approach 2:
The data frame structure is designed to serve multiple devices simultaneously through universal sub-field allocation. The same data frame format can control different devices by changing which sub-field is allocated to which device, reducing the need for separate specialized data frames for each device
Data Source
AI summary
A management controller includes a generating unit for generating a data frame, and a transmitting unit for transmitting the data frame. A junction box controller includes a receiving unit for receiving the data frame, a determining unit for determining commands for a plurality of devices, respectively, based on information written to the data frame, and a control unit for controlling the devices based on the commands determined by the determining unit.