Adapting Device for CAN Bus Speed and Complexity
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Solution Overview
Problem
Current communication networks in vehicles, such as CAN and CAN-FD, are insufficient to handle the increased amount of data generated by advanced vehicle systems, leading to bottlenecks and the need for higher speed data transmission without requiring replacement of existing reliable CAN controller chips.
Innovation Solution
A device and method that mediates the connection of communication modules to a shared bus, allowing them to utilize higher speed data transmission while maintaining compatibility with existing protocols by identifying and adapting to the bit rates of existing CAN or CAN-FD chips, enabling error-free data transmission over a new higher-speed bus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a new higher-speed bus is applied to increase data transmission speed, then the data transmission speed is improved, but all existing CAN controller chips must be replaced which increases device complexity and manufacturing cost
Solution Approach 1:
A mediation device is introduced between the existing CAN controller chip and the new higher-speed bus. This intermediary translates and adapts communication protocols, allowing the old controller to interface with the new high-speed infrastructure without replacement. The mediator handles protocol conversion and signal adaptation, enabling backward compatibility while leveraging new high-speed capabilities.
Solution Approach 2:
The system is divided into separate functional components: the existing CAN controller chip remains unchanged, while a new mediation device handles the interface to the high-speed bus. This segmentation allows independent optimization - the controller chip can continue using proven reliable technology while the mediation layer implements new high-speed protocols and capabilities.
2Productivity
If a new higher-speed bus is applied to handle increased data amount, then the productivity is improved, but the reliability deteriorates due to replacement of stable and reliable components with new unproven components
Solution Approach 1:
The mediation device serves as a buffer and translation layer that protects the reliable existing controller chip from direct exposure to unproven high-speed bus protocols. The intermediary handles protocol adaptation and error management, allowing the proven controller to operate in its reliable environment while still accessing high-speed data transmission capabilities through the mediation layer.
Solution Approach 2:
The mediation device is designed and tested in advance to handle protocol conversion and adaptation. By preparing the translation layer beforehand and separately validating its functionality, the system can introduce high-speed capabilities while maintaining the reliability of existing components. The mediator acts as a pre-tested bridge that manages the transition risks.
3Device complexity
If the number of nodes connected to one CAN bus is increased to reduce components, then the device complexity is reduced, but the data transmission speed deteriorates due to bus arbitration overhead
Solution Approach 1:
The system transitions from a single-dimensional CAN bus architecture to a multi-dimensional hierarchical structure. Existing nodes continue operating on the original CAN bus at their familiar speed, while a mediation device provides access to a new high-speed bus dimension. This dimensional expansion allows nodes to access high-speed transmission when needed while maintaining the original low-speed bus for backward compatibility and reduced arbitration overhead.
Data Source
AI summary
A device of the present invention, connected to a Communication Module (CM) via two signal lines, constructs a frame, formatted according to a second Communication Protocol (CP), from bit signals, which are being received from the CM via one signal line, corresponding to data of a frame of a particular format defined by a first CP, to transmit the constructed frame to a bus while transmitting data detected from the bus to the CM via the other signal line in the form of a frame of the particular format. The device measures a width of a pulse signal inserted at a predetermined position in a frame of the particular format being received from the CM first after power on, identifies a bit rate, based on the measured width, at which the CM transceiver data, and applies the identified bit rate to data communication with the CM.