Johanna Nellen


johanna.nellen at
+49 241 80 21244
Room 4227
Ahornstraße 55
D-52074 Aachen


I am a Postdoc at the research group Theory of Hybrid Systems headed by Prof. Dr. Erika Ábrahám. My research interests include the synthesis and verification of hybrid systems and their application in control engineering.

During my PhD I was granted a  scholarship in the DFG research training group AlgoSyn. I worked on the analysis of hybrid systems in the application area of plant control and on the synthesis of control strategies for hybrid electric vehicles.

Since June 2016, I work for a Ford – RWTH Aachen Alliance project on the verification of automotive Simulink models.

Research Projects

  • Ford – RWTH Aachen Alliance: Simulink Formal Verification, Ford Motor Company
    Project partners: Ford Motor Company (Germany/USA)
  • OASys (Online Algorithms for Optimal Control of Hybrid Propulsion Systems), DFG (German Research Foundation), Project-Id: AB 461/2-1
    Project partners: Chair of Computer Science 1, RWTH Aachen University, Institute of Automated Control, RWTH Aachen University

Teaching Assistance

I supervised students in seminars on “Satisfiability Checking”, “Hybrid Systems Verification”, “Algorithms and Tools for Verification” and “Real-Time Systems”. 
Moreover, I organized practical labs on “Control Strategies for Hybrid Vehicles” and “Explorative Search with Lego Mindstorms Robots”.

The following students finished their Bachelor/Master theses under my supervision:

  • Rebecca Haehn, “Learning control strategies for hybrid vehicles using neural networks”
  • Patricia Wessel, “Grid-based control strategy for hybrid vehicles”
  • Kai Driessen, “Modular verification for PLC controlled hybrid systems”
  • Kim Maren Haps, “Datatypes and tools for the analysis of hybrid systems”
  • Thomas Osterland, “Memory- and time-related action qualifiers in HSFCs”
  • Alin Ionascu, “Modeling and controler synthesis of hybrid propulsion systems using artificial intelligence”
  • Kai Driessen, “Counterexample-guided abstraction refinement for hybrid SFC verification”



DownloadStefan Schupp, Johanna Nellen, Erika Abraham. Divide and Conquer: Variable Set Separation in Hybrid Systems Reachability Analysis. Proc. of the 15th Workshop on Quantitative Aspects of Programming Languages and Systems (QAPL'17), Volume 250 of EPTCS, pages 1–14, Open Publishing Association, 2017.
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Selected Talks

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