Optimal nonlinear control of a Diesel engine air-path system using VGT/EGR actuation

In this paper, an optimal nonlinear control technique based on the analytic solution of a performance index is used to derive a controller for the Diesel engine air system. The control objective is to achieve tracking of suitable references (corresponding to low emissions) for the air-fuel ratio and the fraction of the recirculated exhaust gas. The considered Diesel engine is a medium duty Caterpillar 3126B with six cylinders equipped with a variable geometry turbocharger and an exhaust gas recirculation valve. The proposed controller is designed on the reduced third order mean value model and implemented as a closed-form nonlinear model predictive control law on the full order model. In order to eliminate steady state offset, integral action is introduced. The resulting controllers, with and without integral action, are assessed through simulations with a SIL architecture using dSpace Simulator. The controller with integral action, exhibits good control performance, with zero offset and ensures global stability and tracking of output references.

[1]  Ilya Kolmanovsky,et al.  Turbocharger Modeling for Automotive Control Applications , 1999 .

[2]  Mrdjan Jankovic,et al.  Coordinated passivation designs , 2003, Autom..

[3]  Riccardo Scattolini,et al.  Nonlinear Receding Horizon Control of Internal Combustion Engines , 2000 .

[4]  P. Gawthrop,et al.  Multivariable continuous-time generalised predictive control: a state-space approach to linear and nonlinear systems , 1998 .

[5]  M. Jankovic,et al.  Robust nonlinear controller for turbocharged diesel engines , 1998, Proceedings of the 1998 American Control Conference. ACC (IEEE Cat. No.98CH36207).

[6]  A. Isidori.  Nonlinear Control Systems , 1985 .

[7]  Richard Stobart,et al.  Real-time Adaptive Predictive Control of the Diesel Engine Air-path Based on Fuzzy Parameters Estimation , 2007 .

[8]  Peter J. Gawthrop,et al.  Optimal control of nonlinear systems: a predictive control approach , 2003, Autom..

[9]  Peter J. Gawthrop,et al.  Multivariable continuous-time generalized predictive control (MCGPC) , 1992, Autom..

[10]  Ilya V. Kolmanovsky,et al.  Control of variable geometry turbocharged diesel engines for reduced emissions , 2000, IEEE Trans. Control. Syst. Technol..

[11]  Stefan Pischinger,et al.  A Model Based Predictive Attempt to Control Boost Pressure and EGR-Rate in a Heavy Duty Diesel Engine , 2004 .

[12]  Marko Bacic,et al.  Invariant sets for feedback linearisation based nonlinear predictive control , 2005 .

[13]  Hua Zhao,et al.  The Dilution, Chemical, and Thermal Effects of Exhaust Gas Recirculation on Diesel Engine Emissions - Part 1: Effect of Reducing Inlet Charge Oxygen , 1996 .

[14]  Peter J. Gawthrop,et al.  Nonlinear generalised predictive control and optimal dynamical inversion control , 1999 .

[15]  P. Suchomski,et al.  Continuous-time generalised predictive control of delay systems , 1999 .

[16]  Peter J. Gawthrop,et al.  Continuous-time generalized predictive control (CGPC) , 1990, Autom..

[17]  Gérard Bloch,et al.  Linearized Neural Predictive Control A Turbocharged SI Engine Application , 2005 .

[18]  Mrdjan Jankovic,et al.  Constructive Lyapunov control design for turbocharged diesel engines , 2000, IEEE Trans. Control. Syst. Technol..

[19]  Peter J. Gawthrop,et al.  Nonlinear PID predictive controller , 1999 .