FlexRay Link UART Protocol Data Transmission
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Solution Overview
Problem
Existing data transmission methods between control devices and electronic units in motor vehicles require multiple bus systems with specific protocols, leading to complex overhead and limited data rates due to the need for synchronized clocking and multiple protocol implementations.
Innovation Solution
The method employs a FlexRay link using the UART protocol as a physical route, omitting the bus-specific protocols and restbus, allowing for bidirectional data transmission with simplified asynchronous serial communication (ASC@FlexRay), which enables higher data rates and eliminates the need for clock synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bus systems with specific protocols (FlexRay, CAN) are used for data transmission, then reliable communication is achieved, but device complexity and overhead increase due to multiple protocol implementations and clock synchronization requirements
Solution Approach 1:
The patent extracts and removes the complex bus-specific protocol layers (FlexRay protocol, CAN protocol) from the communication path, retaining only the essential physical transmission medium. This allows UART protocol to operate directly over the FlexRay physical layer without the overhead of implementing and synchronizing multiple bus protocols, thereby reducing device complexity while maintaining communication reliability through the robust UART error handling mechanisms
Solution Approach 2:
The patent makes the physical transmission medium universal by allowing a single physical link to carry UART protocol traffic without being constrained by bus-specific protocol requirements. The same physical infrastructure can support different protocols (UART, FlexRay, CAN) depending on the application, eliminating the need for separate protocol stacks and reducing overall system complexity
2Reliability
If bus systems with synchronized clocking are used for data transmission, then data integrity is maintained, but data rate is limited due to clock synchronization overhead
Solution Approach 1:
The patent replaces the mechanical clock synchronization system with an asynchronous serial communication system. Instead of using synchronized clock signals to maintain data integrity, the system uses UART's inherent start-stop bit protocol and error checking mechanisms, which eliminate the need for continuous clock synchronization overhead and enable higher data rates on the same physical medium
3Adaptability or versatility
If multiple bus systems are implemented for different communication needs, then communication versatility is achieved, but overhead and complexity increase
Solution Approach 1:
The patent creates a universal communication interface where a single physical link can accommodate multiple protocol requirements through the use of UART protocol. This eliminates the need for separate dedicated bus systems for different communication functions, as the same physical infrastructure can be dynamically configured for different data transmission needs without the overhead of maintaining multiple protocol stacks simultaneously
Data Source
AI summary
A method for performing data transmission between a control device and an electronic unit. A control unit and a FlexRay transceiver are provided in the control device and a control unit and a FlexRay transceiver also being provided in the electronic unit. A FlexRay link is used as a physical route for data transmission and the data transmission is performed using the UART protocol.