Per Tunestål, Associate Professor

Research & Projects

Research is focused on various aspects of modelling and control of internal combustion engines. Cylinder pressure based methods play a central part.

Feedback control of Homogeneous Charge Compression Ignition (HCCI) combustion using cylinder pressure for feedback is a recent topic, where the control problem consists of preparing a homogeneous charge such that compression ignition takes place at the desired crank angle. Real-time heat release analysis of the cylinder pressure trace provides quantitative feedback about ignition timing.

Co-authored Books

• “Nonlinear and Hybrid Systems in Automotive Control”, R. Johansson and A. Rantzer (Eds.), ISBN 1-85233-652-8, Springer Verlag 2002

Journal Articles

• “A Method of Lean Air-Fuel Ratio Control using Combustion Pressure Measurement”, Albert T. Lee, Mark Wilcutts, Per Tunestål, J. Karl Hedrick , JSAE Review, October 2001, pp. 389-393.

• “Cylinder Air/Fuel Ratio Estimation using Net Heat Release Data”, P. Tunestål, J. K. Hedrick, Control Engineering Practice, In Press.

Conference Papers and Other Publications

• “HCCI Combustion Phasing in a Multi Cylinder Engine using Variable Compression Ratio”, G. Haraldsson, P. Tunestal and B. Johansson, SAE Powertrain & Fluid Systems Conference, San Diego CA, USA, October 2002.
  

• “Hydrogen Addition For Improved Lean Burn Capability of Slow and Fast Burning Natural Gas Combustion Chambers”, P. Tunestal, M. Christensen, P. Einewall, T. Andersson and B. Johansson, SAE Powertrain & Fluid Systems Conference, San Diego CA, USA, October 2002.
  

• “Compression Ratio Influence on Maximum Load of a Natural Gas Fueled HCCI Engine”, J-O Olsson, P. Tunestal, B. Johansson, S. Fiveland, R. Agama, and D. Assanis, SAE World Congress, Detroit MI, USA, March 2002.

• “Model-Based Estimation of Cylinder Pressure Sensor Offset using Least-Squares Methods”, P. Tunestal, J. K. Hedrick, and R. Johansson, Proceedings of the 40th Conference on Decision and Control, Orlando FL, USA, December 2001, pp. 3740-3745.

• “Closed-Loop Control of an HCCI Engine”, J-O Olsson, P. Tunestal, and B. Johansson, SAE World Congress, Detroit MI, USA, March 2001.

• “A Turbo Charged Dual Fuel HCCI Engine”, J-O Olsson, P. Tunestal, and G. Haraldsson, SAE Fuels & Lubricants Meeting and Exposition, Orlando FL, USA, May 2001.

• “HCCI Operation of a Multi-Cylinder Engine”, P. Tunestal, J-O Olsson, B. Johansson, First Biennial Meeting of the Scandinavian-Nordic Section of the Combustion Institute, Göteborg, Sweden, April 2001.
  

• “Estimation of the In-Cylinder Air/Fuel Ratio of an Internal Combustion Engine by the Use of Pressure Sensors”, P. Tunestål, PhD Thesis, Lund Institute of Technology, Lund, Sweden, April 2001.

• “Cylinder Air/Fuel Ratio Estimation using Net Heat Release Data”, P. Tunestal, J. K. Hedrick, 3rd IFAC Workshop on Advances in Automotive Control, Karlsruhe Germany, March 2001.

• “The Use of Cylinder Pressure for Estimation of the In-Cylinder Air/Fuel Ratio of an Internal Combustion Engine”, P. Tunestal, PhD thesis, University of California, Berkeley CA, USA, December 2000.

• “Lean-Limit Control of a Spark Ignition Engine Using IMEP-Based Incomplete Combustion Detection”, P. Tunestal, A. T. Lee, M. Wilcutts, and J. K. Hedrick, Advanced Vehicle Electronic Control 2000, Ann-Arbor MI, USA, 2000.

• “In-Cylinder Measurement for Engine Cold-Start Control”, P. Tunestal, M. Wilcutts, A. T. Lee, and J. K. Hedrick, IEEE Conference on Control Applications, Kona HI, USA, August 1999.

• “Hybrid Control of a Manufacturing Transport System”, P. Tunestal and M. Krucinski, 36th Conference on Decision and Control, San Diego CA, USA, December 1997.

• “Scanned Image Processor for X11/Motif”, P. Tunestal, Master thesis, Lund Institute of Technology, Lund, Sweden, February 1993.

CV Outline

• Received MS degree in Engineering Physics from Lund Institute of Technology 1993

• Started PhD studies at Lund Institute of Technology 1993

• Awarded fellowship from Swedish Research Council for Engineering Sciences for PhD studies at the University of California, Berkeley 1994

• Started PhD studies at UC Berkeley 1994

• Received PhD degree in Mechanical Engineering from UC Berkeley 2000

• Started employment as Assistant Professor at the Lund Institute of Technology, Combustion Engines 2000

• Received PhD degree in Heat and Power Engineering from Lund Institute of Technology 2001

• Promoted to Associate Professor (Docent) in June 2005