04. Allocation to the Architecture

Review

Let's reiterate what has been done so far. The hazard analysis and risk assessment led to two safety goals:

  1. The oscillating steering torque from the lane departure warning function shall be limited
  2. The lane keeping assistance function shall be time limited, and the additional steering torque shall end after a given time interval so that the driver cannot misuse the system for autonomous driving.

You then derived two functional safety requirements from safety goal number 1:

  1. The lane keeping item shall ensure that the lane departure oscillating torque amplitude is below Max_Torque_Amplitude
  2. The lane keeping item shall ensure that the lane departure oscillating torque frequency is below Max_Torque_Frequency

For safety goal number 2, you derived a functional safety requirement that "the electronic power steering ECU shall ensure that the lane keeping assistance torque is applied for only Max_Duration".

Your next step will be to figure out where these requirements belong in the system architecture.

Allocation of Requirements to the System Architecture

L4 06 Allocation Of Requirements To Architecture

Quiz

Allocation of Requirements to Architecture

For the lane keeping assistance functional safety requirement, we only had one safety requirement. We said that the "electronic power steering ECU shall ensure that the lane keeping assistance torque is applied for only Max_Duration". What would be the correct allocation to the architecture elements?

SOLUTION: The functional safety requirement needs to only be allocated to the electronic power steering ECU.

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