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

2017–2020

More efficient and health conscious usage of lithium ion batteries by adaptive modeling

Torsten Wik Automatic Control
Patrik Johansson Condensed Matter Physics
Swedish Energy Agency

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

2017

Convex identification of minimial function bases for cylinder pressure by using pressure values as basis weights

Marcus Hedegärd, Torsten Wik
IEEE Transactions on Control Systems Technology
Journal article
2017

Using chlorophyll a fluorescence gains to optimize LED light spectrum for short term photosynthesis

Linnéa Ahlman, Torsten Wik, Daniel Bånkestad
Computers and Electronics in Agriculture. Vol. 142, p. 224-234
Journal article
2017

Theoretical bounds on the accuracy of state and parameter estimation for batteries

Torsten Wik, Anton Klintberg, B. Fridholm
American Control Conference, p. 4035-4041
Paper in proceedings
2016

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

M. Nilsson, B. Fridholm, Torsten Wik
Control Engineering Practice. Vol. 48, p. 78-86
Journal article
2016

LED spectrum optimisation using steady-state fluorescence gains

Daniel Bånkestad, Torsten Wik, Linnéa Ahlman
Acta Horticulturae. Vol. 1134, p. 367-374
Journal article
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
Journal article
2016

Simulation of Recirculating Aquaculture Systems

Torsten Wik, Simon Pedersen
Conference contribution
2016

Assessing the Controllability of Heat Exchanger Networks

Fredrik Bengtsson, Karin Eriksson, Elin Svensson et al
Conference contribution
2016

Optimal state based control of LTI systems over unreliable communication channels

Torsten Wik, Babak Hassibi, Fredrik Bengtsson
Reglermöte 2016 (2016)
Conference contribution
2016

Robust recursive impedance estimation for automotive lithium-ion batteries

Torsten Wik, M. Nilsson, B. Fridholm
Journal of Power Sources. Vol. 304, p. 33-41
Journal article
2016

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

Torsten Wik, Johan Lindqvist, Daniel Bånkestad et al
IFAC-PapersOnLine. Vol. 49 (16), p. 392-397
Paper in proceedings
2016

Simulation of Recirculating Aquaculture Plants

Torsten Wik, Simon Pedersen
Conference poster
2016

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

Anna-Maria Carstensen, Daniel Bånkestad, T. Pocock et al
Computers and Electronics in Agriculture. Vol. 127, p. 289-301
Journal article
2016

Cramér-Rao Lower Bounds for Battery Estimation

Björn Fridholm, Anton Klintberg, Torsten Wik
Conference contribution
2016

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

Anna-Maria Carstensen, Daniel Bånkestad, T. Pocock et al
Acta Horticulturae. Vol. 1134, p. 375-383
Journal article
2016

LQG Control for Systems with Random Unbounded Communication Delay

Torsten Wik, Fredrik Bengtsson, Babak Hassibi
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
Paper in proceedings
2016

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

Torsten Wik, Daniel Bånkestad
Computers and Electronics in Agriculture. Vol. 128, p. 77-86
Journal article
2015

Reasons to apply operability analysis in the design of integrated biorefineries

Torsten Wik, Elin Svensson, Karin Eriksson
Biofuels, Bioproducts and Biorefining. Vol. 9 (2), p. 147-157
Journal article
2015

Implementation and robustness of an analytically based battery state of power

H. Kuusisto, B. Fridholm, Torsten Wik
Journal of Power Sources. Vol. 287, p. 448-457
Journal article
2015

Method and system for growth status determination of a plant

Torsten Wik, Anna-Maria Carstensen
Patent application
2015

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

Linnéa Ahlman, Torsten Wik, Daniel Bånkestad
Proceedings 19th Nordic Process Control Workshop, Hurtigruta, Norway, Jan 2015, p. 9:1-4.
Conference contribution
2015

Remote light stress detection for greenhouse LED lighting control

Anna-Maria Carstensen, Torsten Wik, Tessa Pocock
Proceedings 19th Nordic Process Control Workshop, p. 20:1-6
Conference contribution
2015

Marin fiskodling på den svenska västkusten: Tekniska lösningar

Susanne Lindegarth, Susanne P. Eriksson, Kristina Sundell et al
Report
2014

Convex identification of models for asymmetric hysteresis

Marcus Hedegärd, Torsten Wik
American Control Conference, p. 4753-4758
Paper in proceedings
2014

Robustness comparison of battery state of charge observers for automotive applications

Torsten Wik, Magnus Nilsson, Björn Fridholm
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
Paper in proceedings
2014

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

Torsten Wik, Marcus Hedegärd
Automatica. Vol. 50 (2), p. 465-474
Journal article
2014

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

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

Convex identification of models for asymmetric hysteresis

Marcus Hedegärd, Torsten Wik
American Control Conference, p. 4753-4758
Paper in proceedings
2014

Power and current limit estimation for batteries

Torsten Wik, Hannes Kuusisto, Bjön Fridholm
Patent application
2013

Excess light detection for greenhouse illumination

Torsten Wik, Tessa Pocock, Anna-Maria Carstensen
Conference contribution
2013

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

Tessa Pocock, Kirk Clendinning, Torsten Wik
Patent application
2012

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

Torsten Wik, Per Rutquist, Claes Breitholtz
Proceedings 15th Nordic Process Control Workshop, p. 187-188
Conference contribution
2012

Method for plant recovery from stress

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

Greenhouse Artificial Lighting Control

Anna-Maria Carstensen, Tessa Pocock, Torsten Wik
Proceedings 15th Nordic Process Control Workshop, p. 130-132
Conference contribution
2012

Spectrum optimization for artificial illumination

Tessa Pocock, Anna-Maria Carstensen, Torsten Wik
Patent application
2011

Modeling and Simulation of RAS

Torsten Wik
Preprints Workshop on Recirculating Aquaculture Systems, p. 44-
Conference contribution
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
Journal article
2011

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

Torsten Wik, Per Rutquist, Claes Breitholtz
IFAC Proceedings Volumes. 18th IFAC World Congress, Milano, 28 August - 2 September 2011. Vol. 18 (PART 1), p. 5915-5919
Paper in proceedings
2011

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

Torsten Wik, Björn Halvarsson, Bengt Carlsson
Report
2010

Greenhouse Illumination Control

Torsten Wik, Anna-Maria Carstensen
Conference contribution
2010

Observer design for the activated sludge process

Torsten Wik, Marcus Hedegärd
Conference contribution
2010

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

Claes Breitholtz, Torsten Wik, Per Rutquist
Proceedings of 49th IEEE Conference on Decision and Control. Atlanta, 15-17 December 2010, p. 5192-5197
Paper in proceedings
2010

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

Per Rutquist, Claes Breitholtz, Torsten Wik
Conference contribution
2009

Non-conservative robust control: Optimized and constrained sensitivity functions

Per-Olof Gutman, Michael Saunders, Bengt Lennartson et al
IEEE Transactions on Control Systems Technology. Vol. 17 (2), p. 298-308
Journal article
2009

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

Björn Halvarsson, Bengt Carlsson, Torsten Wik
Proc. 7th IEEE International Conference on Control and Automation, Dec. 9-11, Christchurch, New Zealand, p. 978-982
Paper in proceedings
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
Paper in proceedings
2009

Integrated Dynamic Aquaculture and Wastewater Treatment Modelling for Recirculating Aquaculture Systems

Per Wramner, Björn Linden, Torsten Wik
Aquaculture. Vol. 287 (3-4), p. 361-370
Journal article
2008

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

Claes Breitholtz, Torsten Wik, Per Rutquist
Automatica. Vol. 44 (7), p. 1800-1805
Journal article
2008

Closed loop model reduction applied to a tank reactor process

Veronica Olesen, Claes Breitholtz, Torsten Wik
Chemical Engineering Sciences. Vol. 63 (3), p. 674-684
Journal article
2008

Tank reactor temperature control using Quantitative Feedback Theory

Veronica Olesen, Torsten Wik, Claes Breitholtz
Paper in proceedings
2008

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

Torsten Wik, Per Rutquist, Claes Breitholtz
Automatica. Vol. 44 (7), p. 1800-1805
Journal article
2007

Quantitative feedback theory used on a tank reactor model

Torsten Wik, Veronica Olesen, Claes Breitholtz
Proceedings 14th Nordic Process Control Workshop, p. 36-37
Conference contribution
2007

Quantitative assessment in frequency domain of reactor model simplification

Torsten Wik, Claes Breitholtz, Veronica Olesen
Report
2006

Nitrifierande biofilmer för biologisk kväverening i avloppsreningsverk

Fred Sörensson, Torsten Wik, Malte Hermansson et al
Report
2006

A closed loop perspective of model reduction for a CSTR

Claes Breitholtz, Veronica Olesen, Torsten Wik
Conference poster
2006

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

Elin Svensson, Claes Breitholtz, Torsten Wik
Biochemical Engineering Journal. Vol. 30 (1), p. 16-25
Journal article
2006

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

Torsten Wik, Claes Breitholtz, Per Rutquist
Paper in proceedings
2005

A Closed Loop Approach to Tank Reactor Model Simplification

Torsten Wik, Veronica Olesen, Claes Breitholtz
Paper in proceedings
2005

An eigenvalue approach to infinite-horizon optimal control

Torsten Wik, Per Rutquist, Claes Breitholtz
Paper in proceedings
2005

Influent load prediction using low order adaptive modeling

Glenn Äijälä, Torsten Wik, Dough Lumley et al
Paper in proceedings
2004

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

Claes Breitholtz, Torsten Wik, Veronica Olesen
Paper in proceedings
2004

Optimal control of battery supercapacitor systems

Per Rutquist, Torsten Wik, Claes Breitholtz
Paper in proceedings
2004

Trickling filters and biofilm modelling

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

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

Torsten Wik, Claes Breitholtz, Veronica Olesen
12th Nordic Process Control Workshop (29-30)
Paper in proceedings
2004

Modeling, control and simulation of recirculating aquaculture systems

B. Linden, Torsten Wik
Paper in proceedings
2004

Feedforward feedback controller design for uncertain systems

Carl-Magnus Fransson, Bengt Lennartson, Torsten Wik
12th Nordic Process Control Workshop, p. 39-
Paper in proceedings
2004

A modeling, control and simulation study of recirculating aquaculture systems

Torsten Wik
12th Nordic Process Control Workshop, p. 31-38
Paper in proceedings
2004

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

Dough Lumley, Daniel Olsson, Torsten Wik
Journal article
2004

Trickling filters

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

Feedforward feedback controller design for uncertain systems

Torsten Wik, Bengt Lennartson, Carl-Magnus Fransson
Conference contribution
2003

Erfarenheter av modellbaserad styrning av etanoldosering vid Ryaverket

G. Aijälä, D. Lumley, Torsten Wik
Paper in proceedings
2003

Feedforward Feedback Controller Design for Uncertain Systems

Bengt Lennartson, Torsten Wik, Carl-Magnus Fransson
Paper in proceedings
2003

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

D. Olsson, D. Lumley, Torsten Wik
9th IWA conference on design, operation and economics of large wastewater treatment plants, p. 133-140
Paper in proceedings
2002

Global Controller Optimization Using Horowitz Bounds

Torsten Wik, Carl-Magnus Fransson, Per-Olof Gutman et al
Paper in proceedings
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
Journal article
2001

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

Carl-Magnus Fransson, Torsten Wik, Bengt Lennartson et al
Paper in proceedings
2001

H-inf control of uncertain systems using Horowitz bounds

Per-Olof Gutman, Carl-Magnus Fransson, Torsten Wik et al
Paper in proceedings
2000

On optimizing PID controllers for uncertain plants using Horowitz bounds

Bengt Lennartson, Carl-Magnus Fransson, Torsten Wik et al
Paper in proceedings
2000

Strategies to improve the efficiency of tertiary nitrifying trickling filters

Torsten Wik
Water Science and Technology. Vol. 41 (4), p. 477-485
Journal article
1999

Strategies to improve the efficiency of tertiary nitrifying trickling filters

Torsten Wik
Proc. IAWQ Conference on Biofilm Systems, New York, p. 1055-1062
Paper in proceedings
1999

Recovery of carbon black from scrap rubber

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

Adsorption and Denitrification in Nitrifying Trickling Filters

Torsten Wik
Water Research. Vol. 33 (6), p. 1500-1508
Journal article
1999

Rational Transfer Function Models for Nitrifying Trickling Filters

Torsten Wik
Water Science and Technology. Vol. 39 (4), p. 121-128
Journal article
1998

Rational Transfer Functions for Biofilm Reactors

Claes Breitholtz, Torsten Wik
AICHE Journal. Vol. 44 (12), p. 2647-2657
Journal article
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
Paper in proceedings
1998

Transfer Function Models for Biofilm Reactors and Reactors with Porous Catalyst

Claes Breitholtz, Torsten Wik
Preprints of 8th Nordic Process Control Workshop, Skeviks Gård, Stockholm, Sweden, p. 242-
Paper in proceedings
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
Paper in proceedings
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
Paper in proceedings
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-
Paper in proceedings
1997

Evaluation of the fast dynamics in a nitrifying biofilm reactor

Torsten Wik
Conference contribution
1997

Modelling Nitrifying Trickling Filters

Torsten Wik
VATTEN. Vol. 53 (1), p. 33-42
Journal article
1997

Modelling dynamics of nitrifying trickling filters and ammonium meters

Torsten Wik
Med. Fac. Landbouww. Univ. Gent. Vol. 62 (4b), p. 1641-1648
Journal article
1996

Steady state solution of a two-species biofilm problem

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

Dynamic Modeling of Nitrifying Trickling Filters

Torsten Wik
Licentiate thesis
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-
Paper in proceedings
1995

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

A. Mattsson, E. Hansson, Torsten Wik et al
Water Science and Technology. Vol. 32 (8), p. 185-192
Journal article
1994

Modelling the Dynamics of a Trickling Filter for Waste Water Treatment

Torsten Wik, Claes Lindeborg
Proceedings of the Third IEEE Conference on Control Applications, 1994. Vol. 2, p. 1035 - 1040
Paper in proceedings
1994

Modelling the Dynamics of a Trickling Filter for Waste Water Treatment

Torsten Wik, Claes Lindeborg
Conference contribution