User Station for High-Data Rate CAN Communication
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Solution Overview
Problem
Existing CAN bus systems face limitations in achieving higher data rates beyond CAN FD, necessitating further development to support increased bandwidths and real-time capabilities in automotive communication systems.
Innovation Solution
A user station with a control unit that enables exclusive, collision-free access to a second bus system with multiple channels, allowing for high-frequency communication, enabling higher data rates by combining a high-rate transmission system with the CAN system, and allowing for mixed operation with conventional CAN user stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If CAN FD technology is used to increase data rate beyond 1 MBit/s, then data transmission speed is improved, but the data rate is still limited and cannot achieve higher speeds beyond CAN FD
Solution Approach 1:
The communication system is segmented into two distinct bus systems: a first bus system (CAN/CAN FD) for control and coordination, and a second bus system with multiple high-frequency channels for high-speed data transmission. This segmentation allows each subsystem to optimize for its specific function, resolving the contradiction between achieving high data rates and maintaining system compatibility.
Solution Approach 2:
The invention transitions from single-frequency CAN communication to multi-frequency parallel communication by introducing a second bus system with multiple channels operating at different high frequencies. This dimensional expansion in frequency space enables simultaneous transmissions at higher rates without interfering with conventional CAN operations.
2Productivity
If a high-rate transmission system with multiple frequencies is introduced, then data transmission capability is improved, but system complexity increases
Solution Approach 1:
The system separates high-speed data transmission functions from control functions by assigning them to different bus systems. The first bus system handles arbitration and control at lower speeds, while the second bus system dedicated high-frequency channels handle bulk data transmission, reducing overall system complexity through functional separation.
Solution Approach 2:
The first bus system acts as an intermediary that coordinates access to the second bus system. User stations use the first bus system for arbitration and control, which then mediates access to the high-frequency second bus system, simplifying the complexity of direct multi-frequency coordination.
3Speed
If existing CAN user stations are upgraded to achieve higher data rates, then communication performance is improved, but compatibility with conventional CAN user stations is reduced
Solution Approach 1:
The network is segmented into upgraded user stations with dual bus access and conventional CAN user stations. Upgraded stations can operate in mixed mode, using the first bus system for compatibility with conventional stations and the second bus system for high-speed communication, thereby maintaining both performance improvement and backward compatibility.
Solution Approach 2:
Upgraded user stations are designed with multi-functionality, capable of operating on both the first bus system (for compatibility) and the second bus system (for high performance). This universal design allows the same hardware to serve multiple functions and maintain compatibility across different station types.
4Productivity
If multiple channels are used for simultaneous transmission, then bandwidth is improved, but access control and collision avoidance become more difficult
Solution Approach 1:
The first bus system serves as an intermediary control layer that manages access to the multiple channels of the second bus system. By using the first bus system for arbitration and coordination, the complexity of direct multi-channel access control is reduced, as stations can negotiate channel usage through the simpler first bus protocol.
Solution Approach 2:
User stations perform preliminary arbitration and access negotiation on the first bus system before transmitting data on the second bus system channels. This preliminary action on the control bus ensures that channel access is pre-coordinated, reducing the complexity of real-time collision avoidance on the high-speed channels.
Data Source
AI summary
A user station for a bus system and a method for broadband CAN communication are provided. The user station includes a control unit for controlling an access of the user station via a first bus system to a bus of a second bus system of the communication system, the first bus system being designed for a communication, in which at least at times an exclusive, collision-free access of one of at least two user stations of the communication system to a bus of the first bus system is ensured, and the bus of the second bus system having at least two channels, via which it is possible to transmit messages of the at least two user stations of the communication system in different separate frequency ranges temporally independently of one another.