In-Vehicle Data Communication Device Protocol Conversion
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Solution Overview
Problem
Existing methods for data communication between in-vehicle devices and mobile devices require compatible protocols and often involve arbitration, which complicates the use of external devices and limits flexibility in data transmission.
Innovation Solution
A method and device that utilize a second data protocol without arbitration for data transmission from an in-vehicle data communication device to a mobile device, allowing for the use of existing and standardized communication protocols, and including data filtering and conversion to asynchronous serial interfaces for flexible data packet sizes, along with optional encryption and authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If arbitration is used in data transmission protocols, then data access control and collision avoidance are improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The patent segments the communication system into two distinct parts: an arbitration-based interface for connecting to the vehicle's data bus (improving reliability through controlled access) and a non-arbitration interface for connecting to mobile devices (simplifying operation). This segmentation allows each interface to be optimized independently, resolving the contradiction between reliable data access control and simplified protocol operation.
2Ease of operation
If standardized communication protocols are used, then compatibility and ease of operation are improved, but adaptability to different device requirements deteriorates
Solution Approach 1:
The patent introduces an intermediary device (the communication device with converter) that mediates between the standardized arbitration-based vehicle data bus and the non-standardized mobile device connections. This intermediary performs protocol conversion and data filtering, allowing standardized protocols to be used where appropriate while providing adaptability for different mobile device requirements through the conversion capability.
3Productivity
If data filtering and conversion are implemented, then data transmission efficiency and adaptability are improved, but device complexity increases
Solution Approach 1:
The patent extracts and separates the complex data filtering and conversion functions into a dedicated intermediary communication device, rather than embedding them in every connected device. This extraction allows the mobile devices and in-vehicle devices to remain simple while the intermediary handles the complexity of protocol conversion and data filtering, improving overall transmission efficiency without unnecessarily complicating individual devices.
Data Source
AI summary
A method for data communication in a vehicle between an in-vehicle device and a mobile device coupled with the vehicle includes transmitting, by the in-vehicle device, data via a data bus of the vehicle to an in-vehicle data communication device, a first data protocol being used for this purpose, in which an arbitration occurs. The data communication device converts the data, and the data communication device transmits the converted data via a data link to the mobile device. A second data protocol is used in the data transmission from the in-vehicle data communication device to the mobile device, in which no arbitration occurs. A data communication device by which the method of the invention may be implemented is also described.