Torsten Wik

Biträdande professor at Electrical Engineering, Reglerteknik, automation och mekatronik, Automatic Control

Torsten Wik is Professor in the Automatic control research group. He focuses his research and teaching mainly on process control, involving methods and theoretical aspects as well as direct applications. Methods include optimal control, model reduction and systems with model uncertainties. The applications are in general energy saving, environmental and biological systems such as water treatment, recirculating aquaculture systems (RAS), and LED lighting in greenhouses. Torsten is also involved in Volvo vehicle applications, aiming at reduced fuel consumption and increased use of electric propulsion.

Source: chalmers.se

Projects

2014–2018

Development of NOvel, high‐quality MArine aquaCULTURE in Sweden ‐ with focus on environmental and economic sustainability (NOMACULTURE)

Torsten Wik Automatic Control
Ingrid Undeland Food and Nutrition Science
Mistra

2012–2017

Intelligent Light

Torsten Wik Automatic Control
Anna-Maria Carstensen Automatic Control
Linnéa Ahlman Automatic Control
Mistra

2017–2020

Effektivare och skonsammare användning av litiumjonbatterier genom adaptiv modellering

Torsten Wik Automatic Control
Anton Klintberg Automatic Control
Swedish Energy Agency

2016–2017

Skattning av cylinderseparerat cylindertryck för effektivare och renare förbränning.

Torsten Wik Automatic Control
Marcus Hedegärd Automatic Control
Swedish Energy Agency
Volvo Group

2012–2014

BatMan - förberedelse för förbättrad återanvändning av batterisystem

Lars Davidson Fluid Dynamics
Anne-Marie Tillman Environmental Systems Analysis
Bo Egardt Automatic Control
Torsten Wik Automatic Control
Olivier Petit Fluid Dynamics
Duncan Kushnir Environmental Systems Analysis
Swedish Energy Agency

2012–2014

State-of-Function for energy storage systems in electrified vehicles

Torsten Wik Automatic Control
Swedish Energy Agency

2012–2014

Experimental RAS plant technology

Torsten Wik Automatic Control
Erik Windhede Automatic Control
VINNOVA

2014–2016

Estimation of cylinder separated torque for efficient and clean combustion

Torsten Wik Automatic Control
Swedish Energy Agency

2014–2015

NÄRFISK-14

Torsten Wik Automatic Control
VINNOVA

2015–2016

Life-Long Battery Control

Torsten Wik Automatic Control
Swedish Energy Agency

There might be more projects where Torsten Wik participates, but you have to be logged in as a Chalmers employee to see them.

Publications

2016

Simulation of Recirculating Aquaculture Systems

Simon Pedersen, Torsten Wik,
20th Nordic Process Control Workshop, Sigtuna, Aug 2016
Conference paper - non peer reviewed
2016

Simulation of Recirculating Aquaculture Plants

Simon Pedersen, Torsten Wik,
Regermöte, Göteborg 2016
Conference poster
2016

Optimal state based control of LTI systems over unreliable communication channels

Fredrik Bengtsson, Babak Hassibi, Torsten Wik et al
Reglermöte 2016 (2016)
Conference paper - non peer reviewed
2016

LQG Control for Systems with Random Unbounded Communication Delay

Fredrik Bengtsson, Babak Hassibi, Torsten Wik et al
Proceedings of the 55th IEEE Conference on Decision and Control (CDC 2016); Las Vegas; United States; 12-14 December 2016, p. Art no 7798406, Pages 1048-1055
Conference paper - peer reviewed
2016

Cramér-Rao Lower Bounds for Battery Estimation

Anton Klintberg, Björn Fridholm, Torsten Wik et al
Reglermöte
Conference paper - non peer reviewed
2016

Assessing the Controllability of Heat Exchanger Networks

Fredrik Bengtsson, Elin Svensson, Torsten Wik et al
20th Nordic Process Control Workshop
Conference paper - non peer reviewed
2016

Complexity of Chlorophyll Fluorescence Dynamic Response as an Indicator of Excessive Light Intensity

Johan Lindqvist, Daniel Bånkestad, Anna-Maria Carstensen et al
IFAC-PapersOnLine - 5th IFAC Conference on Sensing, Control and Automation Technologies for Agriculture (AGRICONTROL). Vol. 49 (16), p. 392-397
Conference paper - peer reviewed
2016

Growth tracking of basil by proximal remote sensing of chlorophyll fluorescence in growth chamber and greenhouse environments

Daniel Bånkestad, Torsten Wik,
Computers and Electronics in Agriculture. Vol. 128, p. 77-86
Scientific journal article - peer reviewed
2016

Remote detection of light tolerance in Basil through frequency and transient analysis of light induced fluorescence

Anna-Maria Carstensen, T. Pocock, D. Bånkestad et al
Computers and Electronics in Agriculture. Vol. 127, p. 289-301
Scientific journal article - peer reviewed
2016

Exploring the dynamics of remotely detected fluorescence transients from basil as a potential feedback for lighting control in greenhouses

Anna-Maria Carstensen, Torsten Wik, D. Bånkestad et al
Acta Horticulturae. Vol. 1134, p. 375-383
Scientific journal article - peer reviewed
2016

LED spectrum optimisation using steady-state fluorescence gains

Linnéa Ahlman, D. Bånkestad, Torsten Wik et al
Acta Horticulturae. Vol. 1134, p. 367-374
Scientific journal article - peer reviewed
2016

Kalman filter for adaptive learning of look-up tables with application to automotive battery resistance estimation

B. Fridholm, Torsten Wik, M. Nilsson et al
Control Engineering Practice. Vol. 48, p. 78-86
Scientific journal article - peer reviewed
2016

Robust recursive impedance estimation for automotive lithium-ion batteries

B. Fridholm, Torsten Wik, M. Nilsson et al
Journal of Power Sources. Vol. 304, p. 33-41
Scientific journal article - peer reviewed
2015

Implementation and robustness of an analytically based battery state of power

Torsten Wik, B. Fridholm, H. Kuusisto et al
Journal of Power Sources. Vol. 287, p. 448-457
Scientific journal article - peer reviewed
2015

Marin fiskodling på den svenska västkusten: Tekniska lösningar

Anette Ungfors, Björn Thrandur Björnsson, Susanne Lindegarth et al
Report
2015

Using Fluorescence as Control Parameter to Decide Optimal Light Spectrum for Plant Growth

Linnéa Ahlman, Daniel Bånkestad, Torsten Wik et al
Proceedings 19th Nordic Process Control Workshop, Hurtigruta, Norway, Jan 2015, p. 9:1-4.
Conference paper - non peer reviewed
2015

Remote light stress detection for greenhouse LED lighting control

Anna-Maria Carstensen, Torsten Wik, Tessa Pocock et al
Proceedings 19th Nordic Process Control Workshop, p. 20:1-6
Conference paper - non peer reviewed
2015

Method and system for growth status determination of a plant

Anna-Maria Carstensen, Torsten Wik,
Patent application
2015

Reasons to apply operability analysis in the design of integrated biorefineries

Elin Svensson, Karin Eriksson, Torsten Wik et al
Biofuels, Bioproducts and Biorefining. Vol. 9 (2), p. 147-157
Scientific journal article - peer reviewed
2014

Solving the Hamilton-Jacobi-Bellman equation for a stochastic system with state constraints

Per Rutquist, Torsten Wik, Claes Breitholtz et al
Proceedings of the 53rd IEEE Annual Conference on Decision and Control, CDC 2014, Los Angeles, United States, 15-17 December 2014, p. 1840-1845
Conference paper - peer reviewed
2014

Robustness comparison of battery state of charge observers for automotive applications

Björn Fridholm, Magnus Nilsson, Torsten Wik et al
19th IFAC World Congress on International Federation of Automatic Control, IFAC 2014, Cape Town, South Africa, 24-29 August 2014. Vol. 19, p. 2138-2146
Conference paper - peer reviewed
2014

Power and current limit estimation for batteries

Torsten Wik, Bjön Fridholm, Hannes Kuusisto et al
Patent application
2014

Convex identification of models for asymmetric hysteresis

Marcus Hedegärd, Torsten Wik,
2014 American Control Conference, ACC 2014, Portland, OR, United States, 4-6 June 2014, p. 4753-4758
Conference paper - peer reviewed
2014

Solving the Hamilton-Jacobi-Bellman Equation for a Stochastic System with State Constraints

Per Rutquist, Torsten Wik, Claes Breitholtz et al
Report
2014

Non-parametric convex identification of extended generalized Prandtl–Ishlinskii models

Marcus Hedegärd, Torsten Wik,
Automatica. Vol. 50 (2), p. 465-474
Scientific journal article - peer reviewed
2013

Method for controlling a growth cycle for growing plants using state oriented control

Kirk Clendinning, Tessa Pocock, Torsten Wik et al
Patent application
2013

Excess light detection for greenhouse illumination

Torsten Wik, Anna-Maria Carstensen, Tessa Pocock et al
Proceedings 18th Nordic Process Control Workshop
Conference paper - non peer reviewed
2012

Spectrum optimization for artificial illumination

Torsten Wik, Anna-Maria Carstensen, Tessa Pocock et al
Patent application
2012

Method for plant recovery from stress

Tessa Pocock, Anna-Maria Carstensen, Torsten Wik et al
Patent application
2012

Optimal Control of a Batch Reactor Using the Linearized Hamilton-Jacobi-Bellman Equation

Per Rutquist, Torsten Wik, Claes Breitholtz et al
Proceedings 15th Nordic Process Control Workshop, p. 187-188
Conference paper - non peer reviewed
2012

Greenhouse Artificial Lighting Control

Torsten Wik, Anna-Maria Carstensen, Tessa Pocock et al
Proceedings 15th Nordic Process Control Workshop, p. 130-132
Conference paper - non peer reviewed
2011

New Input-Output Pairing Strategies Based on Linear Quadratic Gaussian Control

Björn Halvarsson, Torsten Wik, Bengt Carlsson et al
Report
2011

Modeling and Simulation of RAS

Torsten Wik,
Preprints Workshop on Recirculating Aquaculture Systems, p. 44
Conference paper - non peer reviewed
2011

An online method for estimation of degradable substrate and biomass in an aerated activated sludge process

Marcus Hedegärd, Torsten Wik,
Water Research. Vol. 45 (19), p. 6308-6320
Scientific journal article - peer reviewed
2011

Finite-time state-constrained optimal control for input-affine systems with actuator noise

Per Rutquist, Claes Breitholtz, Torsten Wik et al
IFAC Proceedings Volumes. 18th IFAC World Congress, Milano, 28 August - 2 September 2011. Vol. 18, p. 5915-5919
Conference paper - peer reviewed
2010

Greenhouse Illumination Control

Anna-Maria Carstensen, Torsten Wik,
15th Nordic Process Control Workshop, Lund
Conference paper - non peer reviewed
2010

Observer design for the activated sludge process

Marcus Hedegärd, Torsten Wik,
15th Nordic Process Control Workshop, Lund
Conference paper - non peer reviewed
2010

State-Constrained Control Based on Linearization of the Hamilton-Jacobi-Bellman Equation

Torsten Wik, Per Rutquist, Claes Breitholtz et al
15th Nordic Process Control Workshop, Lund
Conference paper - non peer reviewed
2010

Automated Controller Design using Linear Quantitative Feedback Theory for Nonlinear systems

Roozbeh Kianfar, Torsten Wik,
Reglermöte 2010
Conference paper - non peer reviewed
2010

State constrained control based on linearization of the Hamilton-Jacobi-Bellman equation

Torsten Wik, Per Rutquist, Claes Breitholtz et al
Proceedings of 49th IEEE Conference on Decision and Control. Atlanta, 15-17 December 2010, p. 5192-5197
Conference paper - peer reviewed
2009

A New Input/Output Pairing Strategy based on Linear Quadratic Gaussian Control

Björn Halvarsson, Bengt Carlsson, Torsten Wik et al
Proc. 7th IEEE International Conference on Control and Automation, Dec. 9-11, Christchurch, New Zealand, p. 978-982
Conference paper - peer reviewed
2009

Automated Controller Design using Linear Quantitative Feedback Theory for Nonlinear systems

Roozbeh Kianfar, Torsten Wik,
Proc. 7th IEEE International Conference on Control and Automation, Dec. 9-11, Christchurch, New Zealand. Vol. 1-3, p. 1955-1961
Conference paper - peer reviewed
2009

Non-conservative robust control: Optimized and constrained sensitivity functions

Carl-Magnus Fransson, Torsten Wik, Bengt Lennartson et al
IEEE Transactions on Control Systems Technology. Vol. 17 (2), p. 298-308
Scientific journal article - peer reviewed
2009

Integrated Dynamic Aquaculture and Wastewater Treatment Modelling for Recirculating Aquaculture Systems

Torsten Wik, Björn Linden, Per Wramner et al
Aquaculture. Vol. 287 (3-4), p. 361-370
Scientific journal article - peer reviewed
2008

On the infinite-time solution to state-constrained stochastic optimal control

Per Rutquist, Claes Breitholtz, Torsten Wik et al
Automatica. Vol. 44 (7)
Scientific journal article - peer reviewed
2008

Tank reactor temperature control using Quantitative Feedback Theory

Veronica Olesen, Claes Breitholtz, Torsten Wik et al
Proceedings 17th IFAC World Congress
Conference paper - peer reviewed
2008

Closed loop model reduction applied to a tank reactor process

Veronica Olesen, Claes Breitholtz, Torsten Wik et al
Chemical Engineering Science. Vol. 63 (3), p. 674-684
Scientific journal article - peer reviewed
2007

Quantitative assessment in frequency domain of reactor model simplification

Veronica Olesen, Claes Breitholtz, Torsten Wik et al
Report
2007

Quantitative feedback theory used on a tank reactor model

Veronica Olesen, Claes Breitholtz, Torsten Wik et al
Proceedings 14th Nordic Process Control Workshop, p. 36-37
Conference paper - non peer reviewed
2006

A closed loop perspective of model reduction for a CSTR

Veronica Olesen, Claes Breitholtz, Torsten Wik et al
Reglermöte 2006
Conference poster
2006

Development of a new course in Process control and measurement techniques: lifting the level of comprehension to a system level

Torsten Wik,
Shifting Perspectives in Engineering Education (Ed. Christie, Michael)
Chapter in monograph, book
2006

On the infinite-time solution to state-constrained stochastic optimal control problems

Per Rutquist, Claes Breitholtz, Torsten Wik et al
Reglermöte 2006
Conference paper - peer reviewed
2006

Nitrifierande biofilmer för biologisk kväverening i avloppsreningsverk

Malte Hermansson, Fred Sörensson, Per-Erik Lindgren et al
Report
2006

Low model order approximations of continuously stirred biofilm reactors with Monod kinetics

Torsten Wik, Elin Göransson, Claes Breitholtz et al
Biochemical Engineering Journal. Vol. 30 (1), p. 16-25
Scientific journal article - peer reviewed
2005

Integrated closed loop system for industrial water purification

Björn Linden, Torsten Wik,
Patent
2005

Influent load prediction using low order adaptive modeling

Johan Lindqvist, Torsten Wik, Dough Lumley et al
2nd IWA Conference on Instrumentation, Control and Automation
Conference paper - peer reviewed
2005

An eigenvalue approach to infinite-horizon optimal control

Per Rutquist, Claes Breitholtz, Torsten Wik et al
Proceedings of the 16 th IFAC World Congress, Prague, Czech Republik
Conference paper - peer reviewed
2005

A Closed Loop Approach to Tank Reactor Model Simplification

Veronica Olesen, Torsten Wik, Claes Breitholtz et al
Proceedings of the 16th IFAC World Congress, Prague, Czech Republic
Conference paper - peer reviewed
2004

Feedforward feedback controller design for uncertain systems

Torsten Wik, Carl-Magnus Fransson, Bengt Lennartson et al
12th Nordic Process Control Workshop
Conference paper - non peer reviewed
2004

Model based control of external carbon dose rate in a full-scale predenitrification system

Torsten Wik, Daniel Olsson, Dough Lumley et al
Water Intelligens Online, IWA Publishing
Scientific journal article - peer reviewed
2004

Feedforward feedback controller design for uncertain systems

Torsten Wik, Carl-Magnus Fransson, Bengt Lennartson et al
12th Nordic Process Control Workshop, p. 39
Conference paper - peer reviewed
2004

A modeling, control and simulation study of recirculating aquaculture systems

Torsten Wik,
12th Nordic Process Control Workshop, p. 31-38
Conference paper - peer reviewed
2004

Parameter sensitivity in a compartmental model of a non-ideally stirred tank reactor

Veronica Olesen, Claes Breitholtz, Torsten Wik et al
12th Nordic Process Control Workshop (29-30)
Conference paper - peer reviewed
2004

Optimal control of battery supercapacitor systems

Per Rutquist, Claes Breitholtz, Torsten Wik et al
Reglermötet 2004
Conference paper - peer reviewed
2004

Model reduction for temperature control of non-ideally stirred tank reactors

Veronica Olesen, Torsten Wik, Claes Breitholtz et al
Reglermötet 2004, Institutionen för signaler och system, Reglerteknik och automation.
Conference paper - peer reviewed
2004

Trickling filters and biofilm modelling

Torsten Wik,
Reviews in Environmental Science and Biotechnology. Vol. 2 (2), p. 193-212
Scientific journal article - peer reviewed
2004

Trickling filters

Torsten Wik,
Biofilms in natural and engineered aqueous systems, chapter Chapter 9, p. Chapter 9
Chapter in monograph, book
2004

Modeling, control and simulation of recirculating aquaculture systems

Torsten Wik, B. Linden,
9th IFAC Symposium on computer applications in biotechnology, Nancy, France
Conference paper - peer reviewed
2003

Erfarenheter av modellbaserad styrning av etanoldosering vid Ryaverket

D. Lumley, Torsten Wik, G. Aijälä et al
8:e Nordiska avloppsvattenkonferensen
Conference paper - peer reviewed
2003

Feedforward Feedback Controller Design for Uncertain Systems

Torsten Wik, Carl-Magnus Fransson, Bengt Lennartson et al
Proc. 42nd Conference on Decision and Control, Maui, HI
Conference paper - peer reviewed
2003

Model based control of external carbon dose rate in a full-scale predenitrification system

Torsten Wik, D. Olsson, D. Lumley et al
9th IWA conference on design, operation and economics of large wastewater treatment plants, p. 133-140
Conference paper - peer reviewed
2002

Global Controller Optimization Using Horowitz Bounds

Carl-Magnus Fransson, Bengt Lennartson, Torsten Wik et al
IFAC World Congress, Barcelona, Spain
Conference paper - peer reviewed
2002

Distribution and activity of ammonia oxidizing bacteria in a large full-scale trickling filter

F. Persson, Torsten Wik, F. Sörensson et al
Water Research. Vol. 36 (6), p. 1439-1448
Scientific journal article - peer reviewed
2001

Multi criteria controller design for uncertain MIMO systes using nonconvex global optimization

Carl-Magnus Fransson, Bengt Lennartson, Torsten Wik et al
40th Conference on Decision and Control, Orlando, FL, USA
Conference paper - peer reviewed
2001

H-inf control of uncertain systems using Horowitz bounds

Carl-Magnus Fransson, Bengt Lennartson, Torsten Wik et al
American Control Conference, Arlington, VA, USA
Conference paper - peer reviewed
2000

On optimizing PID controllers for uncertain plants using Horowitz bounds

Carl-Magnus Fransson, Bengt Lennartson, Torsten Wik et al
IFAC Workshop on digital control: Past, present, and future of PID control, Terassa, Spain
Conference paper - peer reviewed
2000

Strategies to improve the efficiency of tertiary nitrifying trickling filters

Torsten Wik,
Water Science and Technology. Vol. 41 (4), p. 477-485
Scientific journal article - peer reviewed
1999

Strategies to improve the efficiency of tertiary nitrifying trickling filters

Torsten Wik,
Proc. IAWQ Conference on Biofilm Systems, New York, p. 1055-1062
Conference paper - peer reviewed
1999

Recovery of carbon black from scrap rubber

J. Piskorz, P. Majerski, D. Radlein et al
Energy and Fuels. Vol. 13 (3), p. 544-551
Scientific journal article - peer reviewed
1999

Rational Transfer Function Models for Nitrifying Trickling Filters

Torsten Wik,
Water Science and Technology. Vol. 39 (4), p. 121-128
Scientific journal article - peer reviewed
1999

Adsorption and Denitrification in Nitrifying Trickling Filters

Torsten Wik,
Water Research. Vol. 33 (6), p. 1500-1508
Scientific journal article - peer reviewed
1998

Rational Transfer Functions for Biofilm Reactors

Torsten Wik, Claes Breitholtz,
AIChE Journal. Vol. 44 (12), p. 2647-2657
Scientific journal article - peer reviewed
1998

Rational Transfer Function Models for Nitrifying Trickling Filters

Torsten Wik,
Preprints of AQUATECH '98 Conference on Application of Models in Water Management, Amsterdam, The Netherlands, p. 241-248
Conference paper - peer reviewed
1998

Transfer Function Models for Biofilm Reactors and Reactors with Porous Catalyst

Torsten Wik, Claes Breitholtz,
Preprints of 8th Nordic Process Control Workshop, Skeviks Gård, Stockholm, Sweden, p. 242
Conference paper - peer reviewed
1998

Transfer function models for CSTs with diffusion and reaction in biofilms or permeable catalysts

Torsten Wik, Claes Breitholtz,
Preprints Reglermöte '98, Lunds tekniska högskola, p. 137-141
Conference paper - peer reviewed
1997

Evaluation of the fast dynamics in a nitrifying biofilm reactor

Torsten Wik,
Preprints of the 7th Nordic Process Control Workshop, Vinstra, Norway
Conference paper - non peer reviewed
1997

Modelling Nitrifying Trickling Filters

Torsten Wik,
VATTEN. Vol. 53 (1), p. 33-42
Scientific journal article - peer reviewed
1997

Modelling dynamics of nitrifying trickling filters and ammonium meters

Torsten Wik,
Proc. 11th Forum for Applied Biotechnology, Compure links 653, B-9000 Gent, Belgium. Vol. 62 (4b), p. 1641-1648
Conference paper - peer reviewed
1997

Modelling dynamics of nitrifying trickling filters and ammonium meters

Torsten Wik,
Med. Fac. Landbouww. Univ. Gent. Vol. 62 (4b), p. 1641-1648
Scientific journal article - peer reviewed
1997

Evaluation of the fast dynamics in a nitrifying biofilm reactor

Torsten Wik,
Preprints of the 7th Nordic Process Control Workshop, Vinstra, Norway, p. 290
Conference paper - peer reviewed
1996

Dynamic Modeling of Nitrifying Trickling Filters

Torsten Wik,
Licentiate thesis
1996

Steady state solution of a two-species biofilm problem

Torsten Wik, Claes Breitholtz,
Biotechnology and Bioengineering. Vol. 50 (6), p. 675-686
Scientific journal article - peer reviewed
1996

An investigation of the fast dynamics in a nitrifying biofilm reactor

Torsten Wik,
Proc of the 10th International Biotechnology Symposia , Sydney, Australia, p. 161
Conference paper - peer reviewed
1996

En jämförelse mellan impulssvar med spårämne och stegsvar med reaktant för en icke-linjär process

Torsten Wik,
Preprints, Reglermöte 96, Luleå, Sweden
Conference paper - peer reviewed
1995

Nitrification in a tertiary trickling filter at high hydraulic loads - pilot plant operation and mathematical modelling

Torsten Wik, A. Mattsson, E. Hansson et al
Water Science and Technology. Vol. 32 (8), p. 185-192
Scientific journal article - peer reviewed
1995

Nitrification in a tertiary trickling filter at High Hydraulic Loads - Pilot Plant Operation and Mathematical Modelling

Torsten Wik, A. Matsson, E. Hansson et al
Int Workshop on Biofilm Structure, Growth and Dynamics, Noordvijkerhout, The Netherlands
Conference paper - peer reviewed
1994

Modelling the Dynamics of a Trickling Filter for Waste Water Treatment

Torsten Wik, Claës Lindeborg,
Preprints of the 5th Nordic Process Control Workshop, Lyngby, Denmark
Conference paper - non peer reviewed
1994

Modelling the Dynamics of a Trickling Filter for Waste Water Treatment

Torsten Wik, Claës Lindeborg,
Proceedings of the Third IEEE Conference on Control Applications, 1994. Vol. 2, p. 1035 - 1040
Conference paper - peer reviewed