Title: A control oriented multivariable identification procedure for turbocharged diesel engines

Authors: Chris Criens; Thijs Van Keulen; Frank Willems; Maarten Steinbuch

Addresses: Department of Mechanical Engineering, Eindhoven University, Eindhoven, The Netherlands ' Department of Mechanical Engineering, Eindhoven University, Eindhoven, The Netherlands; DAF Trucks N.V., Eindhoven, The Netherlands ' Department of Mechanical Engineering, Eindhoven University, Eindhoven, The Netherlands; TNO Automotive, Helmond, The Netherlands ' Department of Mechanical Engineering, Eindhoven University, Eindhoven, The Netherlands

Abstract: In this paper, multisine frequency response function identification is used for non-parametric modelling of the air path of a turbocharged diesel engine around a fixed operating point. The variable geometry turbine (VGT) and exhaust gas recirculation (EGR) valve are used as inputs. The nitrogen oxide emissions, air-fuel equivalence ratio, and pressure difference between the intake and exhaust manifold are the considered outputs. A time-efficient and accurate identification procedure for this input-output system is devised, analysed, and executed experimentally for a range of operating points. The analysis quantifies the individual effects of noise and nonlinearities and shows that the identified linear models capture the actual local behaviour with over 97.2% accuracy.

Keywords: turbocharged diesel engines; engine modelling; air path dynamics; dynamic modelling; exhaust gas recirculation; EGR valve; variable geometry turbine; VGT; linear identification; multisine identification; frequency domain analysis; multivariable control; frequency response; nitrogen oxide; NOx emissions; air-fuel equivalence ratio; pressure difference; engine emissions; air pollution; controller design.

DOI: 10.1504/IJPT.2016.076560

International Journal of Powertrains, 2016 Vol.5 No.2, pp.95 - 119

Available online: 13 May 2016 *

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