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📚 PREEVISION

🔧 PREEvision: What, Where, When, Why, How, and Benefits

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🧠 What is PREEvision?

PREEvision (by Vector Informatik) is an integrated model-based E/E system engineering tool used in the automotive industry for designing, managing, and validating electrical and electronic (E/E) architectures. It supports the development from high-level concepts to detailed ECU and network implementation.

📍 Where is PREEvision used?

  • In automotive OEMs and Tier-1 suppliers
  • Across departments working on:
  • E/E system architecture
  • Wiring harness design
  • Network communication (CAN, LIN, FlexRay, Ethernet)
  • AUTOSAR architectures
  • Functional safety (ISO 26262)
  • Service-oriented architectures (SOA)

🕒 When is PREEvision used in the development cycle?

  • During early system design phases to:
  • Define the functional architecture
  • Allocate functions to ECUs or zones
  • Design communication networks
  • Plan wiring harnesses
  • Also used throughout the V-cycle:
  • From concept → design → validation → production → service updates

❓ Why do we use PREEvision?

  • To unify E/E engineering across multiple domains in a single tool
  • To ensure consistency and traceability from function to hardware
  • To avoid duplication of efforts across different teams
  • To meet standards like AUTOSAR, ISO 26262, ASPICE, and Ethernet modeling
  • To reduce errors and manual handoffs by using a single source of truth

⚙️ How is PREEvision used?

  1. Functional Design: Define system-level features and functions.
  2. Architecture Modeling: Create logical, hardware, software, and communication architectures.
  3. Mapping & Allocation: Allocate functions to ECUs, networks, and zones.
  4. Network Design: Define and simulate communication across CAN, LIN, FlexRay, or Ethernet.
  5. Harness Design: Derive wiring harnesses from architecture automatically.
  6. Validation: Run consistency checks and simulations within the tool.
  7. Documentation & Traceability: Export full reports and maintain traceability to requirements.

🌟 Benefits of Using PREEvision

  • ✅ All-in-one MBSE platform for automotive E/E development
  • ✅ Highly consistent and traceable architecture modeling
  • ✅ Supports zonal architecture and distributed computing
  • ✅ Seamless integration with AUTOSAR workflows
  • ✅ Enables reuse of architectures and components
  • ✅ Helps in impact analysis and safety assessments
  • ✅ Facilitates cross-functional collaboration
  • ✅ Compatible with tools like MagicDraw, CANoe, and Capital

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** 📋 PREEvision Interview Questions and Answers**

1. What is PREEvision?
PREEvision is a model-based development tool used for designing E/E architectures in the automotive industry.

2. What does E/E architecture mean?
It refers to Electrical/Electronic architecture – the network of ECUs, sensors, actuators, wiring, and software in a vehicle.

3. What is the main use of PREEvision?
It’s used to model and manage complex vehicle architectures, including hardware, software, and communication networks.

4. How does PREEvision help in vehicle development?
It centralizes design, ensures consistency, traceability, and supports AUTOSAR and ISO 26262 compliance.

5. What kind of architecture can you model in PREEvision?
Functional, logical, technical, hardware, communication, and wiring architectures.

6. What is a functional architecture?
It represents the system’s functions without detailing physical hardware.

7. What is a logical architecture in PREEvision?
It maps functions to logical components that may later be mapped to ECUs.

8. What is a technical architecture?
It shows how software functions are assigned to specific ECUs and buses.

9. What is a wiring harness in PREEvision?
The physical wires and connectors that carry signals between ECUs.

10. What is signal mapping in PREEvision?
Defining which signals are sent/received between functions and over which network channels.

11. How does PREEvision support AUTOSAR?
It supports AUTOSAR-compliant modeling for software components, interfaces, and configurations.

12. What file formats does PREEvision support for export?
It supports ARXML (AUTOSAR XML), Excel, PDF, and others.

13. Can you manage requirements in PREEvision?
Yes, PREEvision allows you to import, trace, and manage requirements across the architecture.

14. What is traceability in PREEvision?
It links requirements to architecture elements, enabling verification and impact analysis.

15. What networks can you model in PREEvision?
CAN, LIN, FlexRay, and Ethernet.

16. How does PREEvision help with change management?
It provides impact analysis, version control, and consistency checks.

17. Can PREEvision generate network communication matrices?
Yes, it can generate communication matrices like DBC and FIBEX.

18. What is variant management in PREEvision?
Handling different configurations of the same architecture for different vehicle models.

19. What is model-based systems engineering (MBSE)?
Using models instead of documents to define and design complex systems.

20. Is PREEvision a simulation tool?
Not for behavior simulation — it's mainly for architecture and design modeling.

21. What is component allocation in PREEvision?
Assigning logical components or functions to ECUs or hardware nodes.

22. What is a communication cluster?
A group of ECUs and buses that communicate with each other.

23. What are design layers in PREEvision?
Different abstraction levels: functional, logical, technical, and physical.

24. Can PREEvision support distributed development?
Yes, with version control and team collaboration features.

25. What’s the advantage of using PREEvision over Excel-based tools?
Better consistency, traceability, automation, and visualization.

26. What is signal routing?
Defining the path a signal takes from the sender to the receiver across network segments.

27. What is a topology diagram in PREEvision?
A visual layout of ECUs and networks in the vehicle.

28. What is wiring design in PREEvision?
Modeling the actual wire harness layout, connectors, terminals, and bundling.

29. Can PREEvision manage hardware part numbers?
Yes, it can include metadata like part numbers, manufacturers, and versions.

30. What is a gateway ECU?
An ECU that connects and translates signals between different networks like CAN to Ethernet.

31. How does PREEvision help reduce errors?
By enforcing consistency checks and model validation.

32. What is function clustering?
Grouping related functions into logical or physical units.

33. What is the benefit of early architecture modeling?
Identifies issues early, reduces late changes, and improves communication.

34. Can you simulate data flow in PREEvision?
Not fully simulate, but you can trace and visualize signal flow between components.

35. What are bus loads in PREEvision?
The amount of data traffic on a communication bus like CAN or Ethernet.

36. How do you analyze bus load in PREEvision?
Use its built-in tools to calculate and visualize traffic load.

37. What is E2E protection?
End-to-End protection adds redundancy to messages to detect transmission errors.

38. How do you import AUTOSAR elements in PREEvision?
By importing ARXML files directly.

39. How do you ensure compatibility across teams in PREEvision?
Use shared repositories, templates, and modeling guidelines.

40. What is the difference between logical and technical architecture?
Logical is about what the system should do; technical is how it is implemented.

41. What is an ECU abstraction in PREEvision?
It models ECU functionality without going into implementation details.

42. What is the benefit of using a graphical modeling tool like PREEvision?
Better visualization, easier collaboration, and quicker validation.

43. What is signal grouping?
Bundling related signals into a group for easier routing and management.

44. How does PREEvision support ISO 26262?
Through traceability, consistency, and safe architecture modeling.

45. Can PREEvision help in software development?
Indirectly, by defining architecture and communication that software implements.

46. What is hardware-software mapping?
Assigning software components to hardware nodes (like ECUs).

47. What is reuse in PREEvision?
Reusing components, designs, or signals across multiple projects or variants.

48. What happens if architecture becomes inconsistent?
PREEvision alerts the user and suggests fixes.

49. Can PREEvision be customized?
Yes, using scripting and templates.

50. Why do OEMs prefer PREEvision?
It supports large-scale architecture management, AUTOSAR, and detailed E/E design.