ASIL Clasification

 ASIL shortens to 𝐀𝐮𝐭𝐨𝐦𝐨𝐭𝐢𝐯𝐞 𝐒𝐚𝐟𝐞𝐭𝐲 𝐈𝐧𝐭𝐞𝐠𝐫𝐢𝐭𝐲 𝐋𝐞𝐯𝐞𝐥.

It is a key concept in ISO 26262, the functional safety standard for the automotive industry. ASIL categorizes the level of risk associated with potential hazards in an automotive system and defines the required level of rigor for design, validation, and verification to mitigate those risks.

ASIL level is first determined at the hazard analysis and risk assessment stage. This level is then used to define safety goals, which are high-level requirements for mitigating hazards. Safety goals are broken down into functional safety requirements and then into technical safety requirements as part of the system design.

Using these 3 factors ASIL levels are determined.
1️⃣ 𝐒𝐞𝐯𝐞𝐫𝐢𝐭𝐲 (𝐒): How severe is the harm caused by the hazard?
2️⃣ 𝐄𝐱𝐩𝐨𝐬𝐮𝐫𝐞 (𝐄): How often can the hazard occur?
3️⃣ 𝐂𝐨𝐧𝐭𝐫𝐨𝐥𝐥𝐚𝐛𝐢𝐥𝐢𝐭𝐲 (𝐂): How easily can the driver or system control or avoid the hazard?

ASIL levels range from:
🟣 𝐀𝐒𝐈𝐋 𝐀: Lowest safety requirements
🟣 𝐀𝐒𝐈𝐋 𝐁: Moderate safety requirements
🟣 𝐀𝐒𝐈𝐋 𝐂: High safety requirements
🟣 𝐀𝐒𝐈𝐋 𝐃: Highest safety requirements

There’s also 𝐐𝐌 (Quality Management) for systems where safety-critical processes are not required.

Consider an electronic braking system. If the system fails, it could lead to loss of vehicle control, posing a severe risk to passengers and pedestrians. This would likely be classified as ASIL D, requiring robust design, validation, and monitoring processes to prevent failures.

Author : DHEERJ P😊