Philipp Orth

RAPID PROTOTYPING OF SEQUENTIAL CONTROLLERS WITH PETRI NETS

Abstract This paper focuses on the possibilities of a Petri net based rapid control prototyping (RCP) tool chain. P/T nets extended by interfaces and connected to an extended state model allow the description of typical programmable logic controller tasks. After a general introduction to RCP, the method is applied to the area of sequential control, and code generation for the chosen model is depicted. The paper closes with an example for a tool chain, demonstrated by system simulation and Software-in-the-Loop for a subsystem of a flexible manufacturing system in an industrial fieldbus environment.

Synthesis of a Discrete Control for Hybrid Systems by Means of a Petri-Net-State-Model

The design of discrete control systems for technical processes leads to hybrid systems. These can be modelled by a combination of several Petri Nets and extended state space models with appropriate interfaces between them. For the analysis of the whole system, the introduced evolution graph is used to describe hybrid reachability, including generally infinite converging cycles by a covered graph. The analysis results are utilised to synthesise minimal extensions to the control system to assure desired system behaviour like liveness or reversibility. The procedure is illustrated by a small example.

HYBRID SYSTEM ANALYSIS USING A PARAMETERISED EVOLUTION GRAPH

Abstract Hybrid systems are modelled in this article by the Petri-Net-StateModel, a combination of Petri nets and extended state space models with appropriate interfaces between them. For system analysis the evolution graph is used, describing hybrid reachability. The analysis results can be used for graph based procedures, e. g. to correct a chosen controller. Since system parameters have often to be considered as variable, the parameterised evolution graph is presented as an extension to the common evolution graph, allowing insertion of additional information into the evolution graph without losing applicability of other algorithms. The procedure is illustrated by an example of two production lines in conflict.

Mastering the future: Agile model-based system design for BMW’s electrified next generation platform

Future mobility systems are becoming more complex. Existing processes for hardware component oriented development reach a limit for highly integrated systems. High quality cannot be efficiently ensured any longer at shorter development cycles and reduced budgets.

Multi modelling environment development of an air path control software for mass production

Abstract This paper deals with the model based development of an air path control software for mass production, using several modelling environments with different engine control units (ECU) as target controller and different tool-chains to produce the mass production code. It introduces to a software process suitable for a multi-platform development, including the typical approach of rapid control prototyping (RCP) established in the automotive industry. Requirements for automatic model translation are discussed as well as problems with respect to the realisation and availability of automatic model converters. A procedure to ensure that software component derivatives translated for another modelling environment are equal to the content of the main software branch is demonstrated, consisting of back-to-back unit-tests within a Software-in-the-Loop (SiL) simulation.

Rapid Control Prototyping petrinetzbasierter Steuerungen mit dem Tool NETLAB (Rapid Control Prototyping of Petri Net Based Controllers with the Tool NETLAB)

Abstract Der Beitrag beschreibt das Rapid Prototyping ereignisdiskreter Steuerungen. Während des Entwurfsprozesses wird mit dem Petrinetz-Zustandsraum-Modell (PNZRM) eine auf S/T-Netzen beruhende hybride Modellform genutzt. Mit Netlab steht ein Aufsatz für Matlab/Simulink zur Verfügung, der die Beschreibung ausführbarer ereignisdiskreter Modelle unterstützt und so innerhalb der Entwurfsumgebung die Modellierung in der Form des PNZRM ermöglicht. Netlab bietet auch eine zum Real-Time Workshop kompatible C-Code-Generierung. Der stark auf die grafische Darstellung ausgerichtete Ansatz ist vielversprechend in Bezug auf die Selbstdokumentation der erstellten Modelle. Zudem eröffnen die Programmier-Schnittstellen von Netlab neue Möglichkeiten bei der Erforschung und praktischen Erprobung von Entwurfsmethoden.