Observer design of critical states for air path flow regulation in a variable geometry turbocharger exhaust gas recirculation diesel engine

Abstract

Modern automotive diesel engines rely on control strategies that must optimally manage the flows of fresh air and recirculated exhaust gas to achieve the best trade-off between torque demand and engine out emissions. An important aspect of the gas exchange regulation problem is the complex interaction between the variable geometry turbocharger (VGT) and the exhaust gas recirculation (EGR) valve and their associated flows. Control strategies that seek to optimize these flows must either have direct flow measurements or have access to the state variables that provide information on these flows. Furthermore, while the precise control of high-pressure (HP) EGR flow is essential, minimizing its usage is desirable given the engine durability concerns related to the excessive use of HP EGR, such as EGR valve coking and sticking, plugged EGR cooler, cylinder deposits, and valve deposits, to name a few. Exhaust gas recirculation may be optimally used if information on the level of inertness or leanness (oxygen content) of the exhaust gases is available. This paper presents the systematic design of observers for state variables that facilitate the design of such an optimal gas exchange control policy, thereby eliminating the need for direct sensing of the state variables for which the observer designs are proposed.

Keywords

diesel engines engine modelling nonlinear systems sliding mode observers

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References

Hopka

Upadhyay

Rizzoni

Guezennec

Identification of a mean value model of a modern diesel engine for control design. In Proceedings of the ASME International Mechanical Engineering Congress and Exposition, Washington, DC, 2003.

Upadhyay

Utkin

V. I.

Rizzoni

Multivariable control design for intake flow regulation of a diesel engine using sliding mode. In IFAC Congress on Transportation and Vehicles, Control of Advanced Engines, July 2002.

Upadhyay

Modeling and model based control design of the VGT-EGR system for the intake flow regulation in diesel engines. PhD Thesis, Department of Mechanical Engineering, Ohio State University, Columbus, OH, 2001.

Utkin

V. I.

Chang

Kolmanovsky

Cook

Sliding mode control for variable geometry turbocharged diesel engines. In Proceedings of the American Control Conference, Chicago, IL, 2000.

Kolmanovsky

I. M.

Moraal

Van Nieuwstadt

Stefanopoulou

. Issues in modeling and control of intake flow in variable geometry turbocharged engines. In Proceedings of 18th IFIP Conference on System Modeling and Optimization, 1997.

Jankovic

Kolmanovsky

. Robust non-linear control for turbocharged diesel engines. In Proceedings of the American Control Conference, 1998.

Guezzella

Amstutz

Control of diesel engines. IEEE Contr. Syst. Mag., 1998, 18(2), pp 53–71.

Van Nieuwstadt

Coordinated control of EGR valve and intake throttle for better fuel economy in diesel engines. In SAE World Congress, SAE 2003-01-0362, 2003.

Fredriksson

Egart

Estimation exhaust manifold pressure in a turbocharged diesel engine. In Proceedings of the 2002 IEEE International Conference on Control Applications, Glasgow, UK, 2002.

10.

Shim

Seo

J. H.

Passivity framework for nonlinear state observer. In Proceedings of the American Control Conference, Chicago, IL, 2000.

11.

Amstutz

Del Re

L. R.

EGO sensor based robust output control of EGR in diesel engines. IEEE Trans. Contr. Syst. Technol., 1995, 3(1) 39–48.

12.

Utkin

V. I.

Guldner

Shi

Sliding mode control in electro-mechanical systems, 1999 (Taylor and Francis).

13.

Utkin

V. I.

Sliding modes in control optimization, 1992 (Springer-Verlag).