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Robustness Modelling of Complex Systems - Application to the Initialisation of a Hybrid Electric Vehicle Propulsion System
Technical Paper
2013-01-1231
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Robustness is particularly important in complex systems of systems due to emergent behaviour. This paper presents two novel, techniques developed as part of a framework for design for robustness of complex automotive electronic systems, but in principle could be applied to a broad range of distributed electronic systems. The overall framework is described to give the context of use for the techniques. The first technique is a “robustness case” which is a structured argument for the robustness of a system analogous to a safety case. The second is a model based approach to early robustness verification of complex systems.
The approaches are demonstrated by their application to the system initialisation of the propulsion control system of a hybrid electric vehicle. The hybrid system initialisation process is discussed in terms of the key objectives and the technical implementation, illustrating the level of complexity underlying a simple high level requirement. The hybrid system initialisation model structure is presented in the form of a set of interlinked state-charts representing the five electronic control units and two control network systems which are the key system elements. An approach to model based robustness verification is described, covering a method of defining test objectives based on a structured robustness argument. The key steps in the testing of the model based on; coverage, parameter variation and fault insertion are described and illustrated with results. Finally, conclusions on the usefulness and limitations of the approach are given, with recommendations for further work.
Citation
McMurran, R. and Jones, R., "Robustness Modelling of Complex Systems - Application to the Initialisation of a Hybrid Electric Vehicle Propulsion System," SAE Technical Paper 2013-01-1231, 2013, https://doi.org/10.4271/2013-01-1231.Also In
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