The increasing complexity of electric/electronic architectures (EEA) in the automotive domain raised the necessity of model-based development processes for the design of such heterogeneous systems, which combine different engineering principles with different viewpoints. High-level simulation is a great means to evaluate the EEA in the concept phase of the design, since it reduces costly real-world experiments. However, model-based EEA design and analysis as well as its simulation are often separate processes in the development lifecycle. In this paper, we present a novel approach that extends stateof-the-art model-based systems engineering principles of EEA by a behavior specification reusing library components. The specification is seamlessly integrated in the development process of a single source EEA model. Therewith, the starting point is the abstract logical function architecture of the EEA. Based on this single source EEA model we synthesize a unified high-level simulation model, which is capable of linking the behavioral model with lower level implementation details of other domains, e.g. the network communication of the underlying hardware topology. This cross-layer simulation enables an early but holistic system's behavior analysis of the dynamic changes which typically depend on the scenarios applied. Moreover, the integrated approach enables the potential to feedback the simulation results into suitable EEA metrics and benchmarks for further analysis and optimization as well as the seamless traceability of the behavioral specification to requirements and other abstraction layers. A driver assistance system use case demonstrates the proof-ofconcept and the benefits of our methodology.
Abstract. The draft international standard under development ISO 26262 describes a safety lifecycle for road vehicles and thereby influences all parts of development, production, operation and decommissioning. All systems affected by the standard, like anti-trap protection or advanced driver assistance systems, contain hierarchical electric and electronic parts. After publishing the final version, they all should be designed, assessed and documented to the demands of ISO 26262.The intercommunication structure of the distributed automotive control system, consisting of electronic control units (ECU), sensors and actuators, and functions computed by this control system, are specified by the electric and electronic architecture (EEA). In the context of the ISO 26262, the EEA contributes to the intercommunication of distributed, safety related functions plus the determination of architectures.This article discusses the impact of the standard on the EEA development and the handling of safety requirements demanded by ISO 26262 during early development phases.
In this paper a new high-level system design approach for electronic systems is presented. It supports object-oriented system modeling of software intensive components with the Unified Modeling Language and time-discrete and time-continuous modeling concepts. Our approach supports structural and behavioral modeling with front-end tools and simulation/emulation with back-end tools. The XMI (XML Metadata Exchange) format and the UML metamodel is used for an exchange and storage of CASE data. The CASE tool chain, which we present in this paper, supports concurrent engineering with versioning and configuration management and provides tool adaptors for MATLAB/Simulink and ARTiSAN Real-Time Studio. Using the Unified Modeling Language notation for an overall system design cycle, the focus of this paper lies on the subsystem coupling of different modeling domains and a new code generation approach.
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