IEC 61508 STANDARD DEFINITIONS

SAFETY -
The freedom from unacceptable risk of physical injury or of damage to the health of people, either directly or indirectly as a result of damage to property or to the environment.

FUNCTIONAL SAFETY -
Part of the overall safety that depends on a system or equipment operating correctly in response to its inputs.

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Active Safety in Vehicles and Traffic

Active-safety subsystems of a vehicle are defined as subsystems that have the capability to monitor the state of the vehicle or detect and/or communicate with stationary or mobile objects external to the vehicle in order to assist in maintaining the safety of the vehicle, its occupants, other humans and the environment in which the vehicle and occupants are travelling.

In automotive engineering the functions/subsystems that have the potential to prevent harm to people and property include, amongst others - adaptive cruise control (ACC), electronic stability control (ESC), collision avoidance, collision damage mitigation, lane and road departure control, and overtaking control. Underlying and effectuating the intent of these functions is the entire real-time control system of the vehicle – drivetrain, braking, steering and active suspension. Overlying the active safety systems should be a safety supervisory system that resolves intelligently the natural conflicts and ambiguities that arise when multiple active safety subsystems, being concurrently active, react in real time to circumstances that trigger their intended response.

For road and traffic authorities, the functions/subsystems that currently cause harm to the environment and simultaneously have the potential to mitigate these effects include, the drivetrain which consumes air and fuels and produces gaseous and particulate emissions, and the braking and steering systems which produce particulate emissions.

Adequately addressing the areas of specification, architecture, optimization, design and verification in active safety critical engineering requires the pervasive deployment of model-based design that uses high fidelity mathematical models in specification, and operational models in design, development, verification and validation. EST’s ESSE Systems Engineering Workbench satisfies these requirements through its model-driven, cyber-physical, concurrent design and verification process.

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