Meaning
Analytical procedure used in automotive functional safety to translate hazardous events into specific integrity levels. Engineers use asil risk mapping to assign safety requirements based on the severity of potential injuries and the probability of exposure to the situation. This methodology links high-level vehicle goals to the specific hardware and software components within an electronic control unit, ensuring that the most critical functions receive the highest degree of diagnostic scrutiny and fault tolerance.
Integrity Assignment
Determination of the safety level occurs during the hazard analysis and risk assessment phase of development. If a steering lock malfunction results in a high severity rating but low exposure frequency, asil risk mapping identifies whether the resulting classification is level A, B, C, or D. Higher letters demand more rigorous diagnostic coverage and architectural redundancy.
Component Derivation
Safety goals cascade from the system level down to the individual microcontroller or sensor. A software module participating in a safety function must inherit the requirements established through asil risk mapping to ensure the assembly meets the intended safety targets. Developers verify these assignments during the design freeze.
Traceability Evidence
Documentation of the mapping logic forms a primary part of the safety case for regulatory approval. Auditors examine the asil risk mapping to confirm that the technical safety concept addresses every identified hazard. The process concludes when the hardware-software interface specification captures all integrity constraints.
