1. The Open University School of Engineering and Innovation, , Walton Hall, Kents Hill, Milton Keynes MK7 6AA , UK
2. Chalmers University of Technology Division of Product Development, Department of Industrial and Materials Science, , Chalmersplatsen 4, Gothenburg SE-412 96 , Sweden
3. Volvo Powertrain , Gropegårdsgatan 2, Gothenburg SE-417 15, Sweden
4. Ludwig-Maximilians Universität München , Geschwister-Scholl-Platz 1, 80539 München , Germany