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Part4. Product development at the system level - Coggle Diagram
Part4. Product development at the system level
Development process
implementation
integration
design
verification
specification
validation and configuration
Nomenclature in standard
ASIL B = Required for ASIL B
ASIL (B) = Recommended for ASIL B
4-5 General topics for the product development at the system level_D2P10
4-6 Technical safety concept_D2P13
Specify requirements regarding the functional safety of system after start of production
Verify that the TSRs are suitable to achieve functional safety at the system level
Specify safety mechanisms
Develop a system architectural design
adequate level of franularity
simplicity
modularity
Specify Technical safety requirements
dependencies
contraints
functionality
properties of the system elements and interfaces
Analysis the system architectural design
Verify the system srchitectural design and the TSC to their respective ASIL
Safety Goal_Unintended action shall be avoided
Function safety Goal_shall detect
Technical Safety Goal_shall have two independent
HW-SW interface specification (HSI)
interface element
converter
multilexer
bus interfaces
electrical I/O
memory
characteristics
initialization
message transfer
data integrity
network modes
memory management
timing consistency
Interruots
real-time counter
Technical safety concept verification of system design
requirements for service
requirements for decommissioning
requirements for operation
requirements for Start Of Production (SOP)
4-7 System and item integration and testing_D2P62
Three phases
Integration of the elements that comprise an system to form a complete item
Integration of the item with other systems within a vehile.
Integration of the HW and SW of each element
Object
To verify that the defined safety measures, resulting from safety analyses at the system architectural level, are properly implemented
To provide evidence that the integrated system elements fulfill their safety requirements according to the system architectural design.
To define the intgration steps and to integrate the system elements until the system is fully integrated
Test
Resources Usage test
dynamic
in dynamic environments
power consumption
bus load
runtime monitoring
statically
code regarding interrupt usage
verify worst-case scenarios do not run out of resources
checking for code sizes
Performance test verify the performance
timing
task scheduling
power output
Interface test
Integrated Circuit (IC) communications
interface between elements of an ECU
Serial peripheral interface (SPI)
Stress test
humidity
mechanical shocks
extreme temperatures
Communication and interaction test
communication between systems of the vehicle during runtime
A Fault injection test
introduce faults into the test object during runtime
Back to back test
compares the responses of the test object with responses of a simulation model to the same stimuli
Detect differences bewteen the behaviour of the simulation model and its implementation
An error guessing test
expert knowledge
data collected through lessons learned
A ling-term test
user test under real-life conditions
Integration and test
System
function performance and FSR
Effectiveness of diagnostic coverage
Consistency and correctness of implementation of interfaces
Vehicle
Robustness test
Long-term test user test under real-life conditions
Communication and interaction test
Hardware-Softwaare
system design specification and TSR
A Fault Injection test
Performance test
Robustness test
Stress test
Resource usage test
4-8 Safety Validation_D2P90
Provide evidence
Safety measures are appropriate for the function safety
Validation of the safety goals
HW
Elements of other technologies
SW
Ecternal measures
E/E System
Compliance with safety goals
Complete
Fully achieved at vehicle level
Correct
Vaildation plan
Carry out Execution of Safety Vaildation
Effectiveness of external measures
Effectiveness of elements of other technologies
Controllability
Assumptions that influence the ASIL
Hazard analysis
Risk assessment
Document within Validation report
Evidence that the implemented safety goals achieve functional safety
Follow vaildation plan
Specification of validation procedure
test case
Configuration of the item
driving maneuverers
acceptance criteria
Equipment and required environmental conditions
Execution of safety validation methods
Analysis
ETA
Simulation
FTA
Fault injection
FMEA
Reproducible tests
Test cases
Pass/ Fail criteria
Specified test procedures
Long-term tests
Vehicle driving schedules
Captured test fleets
User tests under real-life conditions
Planel or blind test
Expert panels
Under real-life conditions
Review