Pressure model based coordinated control of VGT and dual-loop EGR in a diesel engine air-path system

  • S. Kim
  • S. Choi
  • H. Jin


This paper describes a pressure-model-based coordinated control method of a variable geometry turbine (VGT) and dual-loop exhaust gas recirculation (EGR) in a diesel engine air-path system. Conventionally, air fraction or burnt gas fraction states are controlled for the control of dual-loop EGR systems, but fraction control is not practical since sensors for fractions are not available on production engines. In fact, there is still great controversy over how best to select control outputs for dual-loop EGR systems. In this paper, pressure and mass flow states are chosen as control outputs without fraction states considering the availability and reliability of sensors. A coordinated controller based on the simple control-oriented model is designed with practical aspects, which is applicable for simultaneous operations of high pressure (HP) EGR, low pressure (LP) EGR, and VGT. In addition, the controller adopts the method of input-output linearization using back-stepping to solve the chronic problems of conventional pressure-based controllers such as coupling effects between operations of HP EGR, and VGT. The control performance is verified by simulation based on the proven GT-POWER model of a heavy-duty 6000cc diesel engine air-path.

Key words

Diesel engine Air-path control Dual-loop EGR Control-oriented model VGT 



effective area (m2)


specific heat at constant pressure (kJ/kg·K)


burnt gas fraction (−)


mass (kg)


engine speed (RPM)


pressure (Pa)


power (kW)


ideal gas constant (kJ/kg·K)


temperature (K)


volume (m3)


mass flow rate (kg/s)


specific heat ratio (−)


efficiency (−)


stoichiometric ratio (−)


turbocharger time constant (s)







intake manifold




exhaust manifold


downstream of turbine


upstream of compressor


high pressure EGR


low pressure EGR


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Ammann, M., Fekete, N. P., Guzzella, L. and Glattfelder, A. (2003). Model based control of the VGT and EGR in a turbocharged common-rail diesel engines: Theory and passenger car implementation. SAE Paper No. 2003-01-0357.Google Scholar
  2. Castillo, F., Witrant, E., Talon, V. and Dugard, L. (2013). Simultaneous air fraction and low-pressure EGR mass flow rate estimation for diesel engines. 5th Symp.System Structure and Control, Part of IFAC Joint Conf. SSSC, Grenoble, France.Google Scholar
  3. Grondin, O., Moulin, P. and Chauvin, J. (2009). Control of a turbocharged diesel engine fitted with high pressure and low pressure exhaust gas recirculation systems. Joint 48th IEEE Conf. Decision and Control, Shanghai, China, 6582–589.Google Scholar
  4. Jin, H., Choi, S. and Jung, H. (2013). Simplified multiple sliding mode transient control with VGT and EGR diesel engine. SAE Paper No. 2013-01-0345.Google Scholar
  5. Jin, H., Choi, S. and Kim, S. (2014). Design of a compressor-power-based exhaust manifold pressure estimator for diesel engine air management. Int. J. Automotive Technology 15, 2, 191–201.CrossRefGoogle Scholar
  6. Jung, H. (2014). Model Based Burnt Gas Fraction Control of Turbocharged Diesel Engine with Dual Loop EGR System. M. S. Thesis. KAIST. Daejeon, Korea.Google Scholar
  7. Kim, S., Jin, H. and Choi, S. (2014). Pressure and flow based control of a turbocharged diesel engine air-path system equipped with dual-loop EGR systems and VGT. American Control Conf., Portland, OR, 1493–1498.Google Scholar
  8. Kolmanovsky, I., Moraal, P., Van Nieuwstadt, M. and Stefanopoulou, A. (1997). Issues in modelling and control of intake flow in variable geometry turbocharged engines. 18th IFIP Conf. System Modelling and Optimization, 436–445.Google Scholar
  9. Mrosek, M. and Isermann, R. (2011). System properties and control of turbocharged diesel engines with highand low-pressure EGR. IFP Energies nouvelles 66, 4, 587–598.CrossRefGoogle Scholar
  10. Sarlashkar, J. and Roecker, R. (2010). Sliding Mode control for diesel engines with airflow dominant fueling. JSAE Annual Cong., Yokohama, Japan, 19–21.Google Scholar
  11. Upadhyay, D. (2001). Modeling and Model Based Control Design of the VGT-EGR System for Intake Flow Regulation in Diesel Engines. Ph. D. Dissertation. The Ohio University. Ohio, USA.Google Scholar
  12. Van Nieuwstadt, M., Kolmanovsky, I. and Moraal, P. (2000). Cooridinated EGR-VGT control for diesel engines: An experimental comparison. SAE World Cong., Detroit, Michigan, USA, 2000-01-0266.Google Scholar
  13. Wahlström, J. (2006). Control of EGR and VGT for Emission Control and Pumping Work Minimization in Diesel Engines. Ph. D. Dissertation. Linköping University.Google Scholar
  14. Linköping, Sweden. Wang, J. (2008a). Hybrid robust air-path control for diesel engine operating conventional and low temperature combustion modes. IEEE Trans. Control System Technology 16, 6, 1138–1151.CrossRefGoogle Scholar
  15. Wang, J. (2008b). Air fraction estimation for multiple combustion mode diesel engines with dual-loop EGR systems. Control Engineering Practice 16, 12, 1479–1486.CrossRefGoogle Scholar
  16. Yan, F. and Wang, J. (2013). Control of diesel engine dualloop EGR air-path systmems by a singular perturbation method. Control Engineering Practice 21, 7, 981–988.CrossRefGoogle Scholar
  17. Yoon, Y. (2011). A Study of Turbocharged Diesel Engine Modeling and Robust Model Based Sliding Mode Controller Design. M. S. Thesis. KAIST. Daejeon, Korea.Google Scholar

Copyright information

© The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.School of Mechanical, Aerospace & System EngineeringKAISTDaejeonKorea
  2. 2.Engine Control TeamHyundai AutronGyeonggiKorea

Personalised recommendations