Vehicle Communication Interface Reducing Latency
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Solution Overview
Problem
Existing communication interfaces in vehicles are often latency-prone and complex, which can lead to delayed reactions in critical systems and user interactions.
Innovation Solution
A flexible, low-latency communication interface is developed using a centrally defined generic communication protocol that includes a transport layer for data segmentation, an application layer for bidirectional data exchange, and the ISO TP standard for HID commands, allowing for efficient status updates and command execution across multiple human interface devices connected via vehicle data buses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a conventional communication interface is used in a vehicle, then data exchange between head unit and human interface devices can be established, but the system experiences high latency and requires a complex protocol stack
Solution Approach 1:
The patent changes the fundamental parameters of the communication protocol by adopting a simplified byte-oriented interface with direct memory access (DMA) capabilities, eliminating the need for complex protocol stacks while reducing latency through efficient data transfer mechanisms
Solution Approach 2:
The patent extracts and removes the unnecessary complexity from the protocol stack by implementing a minimalistic communication interface that only includes essential functions (byte-oriented data transfer, interrupt handling, DMA), thereby reducing both latency and computational overhead
2Device complexity
If a simplified communication interface is implemented, then latency is reduced and the system becomes more lightweight, but flexibility and adaptability for different human interface devices may be compromised
Solution Approach 1:
The patent implements a universal communication interface that can work with multiple types of human interface devices (keypad, display, touch display, voice recognition, gesture recognition) through a single byte-oriented protocol, providing flexibility without requiring device-specific complex protocols
Solution Approach 2:
The communication interface uses dynamic interrupt handling and DMA configuration that can adapt to different device types and data transfer requirements in real-time, maintaining versatility while keeping the base protocol simple and lightweight
Data Source
AI summary
The disclosure relates to a communication interface in a vehicle between a head unit and human interface devices that is flexible, low latency, and comparatively lightweight. The communication interface is centrally defined so that it is valid for all communication paths.