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From requirement document to formal modelling and decomposition of control systems

From requirement document to formal modelling and decomposition of control systems
From requirement document to formal modelling and decomposition of control systems
Formal modelling of control systems can help with identifying missing requirements and design flaws before implementing them. However, modelling using formal languages can be challenging and time consuming. Therefore intermediate steps may be required to simplify the transition from informal requirements to a formal model.

In this work we firstly provide a four-stage approach for structuring and formalising requirements of a control system. This approach is based on monitored, controlled, mode and commanded (MCMC) phenomena. In this approach, requirements are partitioned into MCMC sub-problems, which then will be formalised as independent sub-models. The formal language used in this thesis is Event-B, although the MCMC approach can be applied to other formal languages. We also provide guidelines and patterns which can be used to facilitate the process of modelling in the Event-B language.

The second contribution of this work is to extend the structure of machines in Event-B language and provide an approach for composing the formal MCMC sub-models in
order to obtain the overall specification. The composition deals with phenomena that are shared amongst the formal sub-models. In our third contribution, patterns and guidelines are provided to refine the overall formal specification further in order to define design details. In addition, we discuss the decomposition of a formal model of a control
system.

As practical examples, the MCMC approach is applied to the requirements of three automotive control systems, namely a cruise control system, a lane departure warning system, and a lane centering controller.
Yeganefard, Sanaz
434810e4-48eb-4320-a37f-533cf71f6103
Yeganefard, Sanaz
434810e4-48eb-4320-a37f-533cf71f6103
Butler, Michael
54b9c2c7-2574-438e-9a36-6842a3d53ed0

Yeganefard, Sanaz (2014) From requirement document to formal modelling and decomposition of control systems. University of Southampton, Physical Sciences and Engineering, Doctoral Thesis, 382pp.

Record type: Thesis (Doctoral)

Abstract

Formal modelling of control systems can help with identifying missing requirements and design flaws before implementing them. However, modelling using formal languages can be challenging and time consuming. Therefore intermediate steps may be required to simplify the transition from informal requirements to a formal model.

In this work we firstly provide a four-stage approach for structuring and formalising requirements of a control system. This approach is based on monitored, controlled, mode and commanded (MCMC) phenomena. In this approach, requirements are partitioned into MCMC sub-problems, which then will be formalised as independent sub-models. The formal language used in this thesis is Event-B, although the MCMC approach can be applied to other formal languages. We also provide guidelines and patterns which can be used to facilitate the process of modelling in the Event-B language.

The second contribution of this work is to extend the structure of machines in Event-B language and provide an approach for composing the formal MCMC sub-models in
order to obtain the overall specification. The composition deals with phenomena that are shared amongst the formal sub-models. In our third contribution, patterns and guidelines are provided to refine the overall formal specification further in order to define design details. In addition, we discuss the decomposition of a formal model of a control
system.

As practical examples, the MCMC approach is applied to the requirements of three automotive control systems, namely a cruise control system, a lane departure warning system, and a lane centering controller.

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Published date: August 2014
Organisations: University of Southampton, Electronic & Software Systems

Identifiers

Local EPrints ID: 374904
URI: http://eprints.soton.ac.uk/id/eprint/374904
PURE UUID: b77fcdee-b4ab-4899-9deb-c029c7ca3774
ORCID for Michael Butler: ORCID iD orcid.org/0000-0003-4642-5373

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Date deposited: 11 May 2015 13:42
Last modified: 06 Jun 2018 13:04

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