Safety Isolation Apparatus for ASIL-Level Data Exchange
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Solution Overview
Problem
In automotive systems with multiple safety integrity levels (ASILs), devices at different ASILs cannot efficiently interact, leading to impaired system performance and potential safety faults due to interference and data exchange limitations.
Innovation Solution
A safety isolation method and apparatus that analyzes access requests based on safety levels, isolating write or read-for-ownership operations when safety conditions are not met, ensuring safe data interaction between devices at different ASILs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices at different ASILs are strictly isolated to ensure safety, then system safety is improved, but data interaction efficiency deteriorates
Solution Approach 1:
The patent introduces a safety isolation apparatus as an intermediary component between devices at different ASIL levels. This apparatus monitors and controls access requests, allowing safe data interaction while maintaining isolation. The intermediary enables communication that would otherwise be blocked, resolving the contradiction between safety isolation and interaction efficiency.
Solution Approach 2:
The patent dynamically changes the isolation parameters based on the specific access request characteristics (operation type, safety levels involved). Instead of maintaining fixed strict isolation, the system adjusts the isolation level adaptively - allowing certain operations (like read-only access from lower to higher ASIL) while blocking others (like write operations from lower to higher ASIL), thus improving efficiency without compromising safety.
2Reliability
If strict isolation is enforced between different ASIL devices, then safety interference is prevented, but system complexity increases
Solution Approach 1:
The safety isolation apparatus automatically analyzes access requests and makes isolation decisions based on predefined safety rules without requiring complex external control mechanisms. The system serves itself by autonomously determining whether to allow or block access based on the operation type and safety levels, reducing the need for additional complex isolation management infrastructure.
3Reliability
If write operations are blocked from lower to higher ASIL devices, then data integrity is improved, but operational flexibility deteriorates
Solution Approach 1:
The patent applies different isolation rules to different operation types locally. Write operations from lower to higher ASIL are blocked to protect data integrity, while read operations and other non-modifying operations are allowed to maintain operational flexibility. This localized application of quality control resolves the contradiction by being selective rather than universal in its restrictions.
Data Source
AI summary
A safety isolation method and apparatus, and a computer system are disclosed. The safety isolation apparatus includes a request detection module and a selection module. The request detection module is configured to: receive an access request from an access device, where the access request carries operation information of the access device and safety level-related information of the access device, the safety level-related information of the access device indicates a safety level of the access device, and the operation information indicates an operation of the access device. The selection module is configured to: if the operation of the access device is a write operation or RFO operation, and the safety level of the access device meets a safety isolation condition, isolate the access request. The foregoing solution can implement safe data interaction between devices at a plurality of safety levels, to improve system performance.