Steer-by-wire Gateway for Safety-Speed Data Trade-off
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Solution Overview
Problem
Steer-by-wire systems face challenges in achieving intrinsic safety with high data transfer rates and low costs, particularly due to limitations in conventional bus systems used for communication between control devices.
Innovation Solution
A steer-by-wire system design with two independent bus systems connected via a gateway control device, allowing direct communication between control devices via a third bus system for high data transfer rates, and redundant voltage supplies for reliability, while minimizing the number of required bus interfaces and ensuring intrinsic safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bus systems are used for communication between control devices, then intrinsic safety is achieved, but data transfer rate is limited
Solution Approach 1:
The system divides communication into two segments: a redundant bus system for safety-critical data exchange and a direct third bus connection for high-speed data transfer. This segmentation allows each communication path to be optimized for its specific function, resolving the contradiction between safety and speed.
Solution Approach 2:
A gateway control device acts as an intermediary between the redundant bus systems and the direct third bus connection. The gateway manages data routing, ensuring that high-speed communication does not compromise the integrity of safety-critical communication paths.
2Reliability
If redundant bus systems are implemented for intrinsic safety, then reliability is improved, but system complexity and cost increase
Solution Approach 1:
The gateway control device performs multiple functions: it interfaces with redundant bus systems for safety communication, manages the direct third bus connection for high-speed data transfer, and coordinates between different communication protocols. This multi-functionality reduces the need for separate dedicated components.
Solution Approach 2:
The system merges safety-critical communication and high-speed communication into a unified architecture where the gateway coordinates both paths. This consolidation allows shared resources while maintaining the benefits of redundancy and high speed.
Data Source
AI summary
The invention relates to a steer-by-wire system comprising a first control device that controls at least one steering actuator, and at least one second control device that controls at least one actuator on a steering handle in order to generate a haptic torque, wherein a sensor system for detecting a steering wheel angle is assigned to the second control device, wherein the first control device is connected with a first bus system and the second control device is connected with a second bus system, wherein the two bus systems are connected with each other via a gateway control device, and the first control device and the second control device are connected with each other directly via a third bus system, as well as a method for data exchange in such a steer-by-wire system.