An exhaust gas recirculation control strategy for passenger car diesel engines using an inverse valve model

Abstract

In diesel engines, accurate control of the exhaust gas recirculation (EGR) is important because of its effects on the nitrogen oxide and particulate matter emissions. The conventional EGR control system adopts a simple proportional–integral (PI) control algorithm with a lookup-table-based feedforward control and gain scheduling. However, this lookup-table-based control system has limited control performance in transient operations because the lookup tables are obtained from static engine data.

The objective of this paper is to improve the control performance of the diesel engine EGR system by using a mathematical model of the EGR path. The proposed EGR control system is composed of PI controller gain scheduling and a feedforward control algorithm based on the mathematical model. The gain-scheduling algorithm provides a PI controller gain based on a sensitivity function that elucidates the relationship between the effective flow area of the EGR valve and the EGR mass flowrate. The feedforward algorithm calculates the EGR valve position based on the inverse model of the EGR valve.

The driving cycle test result showed that, compared with the conventional EGR control system, the r.m.s. and maximum values of the target tracking error were reduced by 2.5 per cent and 8.0 per cent respectively.

Keywords

control diesel engine exhaust gas recirculation feedforward gain scheduling modelling

Get full access to this article

View all access options for this article.

References

Johnson

Diesel emission control in review. SAE paper 2006-01-0030, 2006.

Theis

Gulari

A LNT+SCR system for treating the NO_x emissions from a diesel engine. SAE paper 2006-01-0210, 2006.

Guzzella

Amstutz

Control of diesel engines. IEEE Control Systems Mag., 1998, 18(5), 53–71.

Zheng

Reader

G. T.

Hawley

J. G.

Diesel engine exhaust gas recirculation – a review on advanced and novel concepts. Energy Conversion Managmt, 2004, 45(6), 883–900.

Simoson

Wagner

Effects of cooled EGR on a small displacement diesel engine: a reduced-order dynamic model and experimental study. Trans. ASME, J. Energy Resources Technol., 2008, 130(1), 011 102-1–011 102-11.

Gao

Schreiber

The effects of EGR and split fuel injection on diesel engine emission. Int. J. Automot. Technol., 2001, 2(4), 123–133.

Heywood

J. B.

Internal combustion engine fundamentals, 1988 (McGraw-Hill, New York).

Lapuerta

Hernandez

Gimenez

Evaluation of exhaust gas recirculation as a technique for reducing diesel engine NO_x emissions. Proc. IMechE, Part D: J. Automobile Engineering, 2000, 214(1), 85–93.

Yao

Zhang

Zheng

Chen

Xing

Effects of exhaust gas recirculation on combustion and emissions of a homogeneous charge compression ignition engine fuelled with primary reference fuels. Proc. IMechE, Part D: J. Automobile Engineering, 2007, 221(2), 197–213.

10.

Chun

EGR technology. Auto J., Korean Soc. Automot. Engrs, 2006, 28(6), 46–51.

11.

Daisho

Uchida

Morita

Shimogata

Saito

Effects of supercharging and EGR on diesel combustion and emissions. In Proceedings of the International Symposium on The diagnostics and modeling of combustion in internal combustion engines (COMODIA 94), Yokahama, Japan, 11–14 July 1994, pp. 281–286 (Japan Society of Mechanical Engineers, Tokyo).

12.

Amstutz

Del Re

L. R.

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

13.

Jankovic

Kolmanovsky

Robust nonlinear controller for turbocharged diesel engine. In Proceedings of the American Control Conference, Philadelphia, Pennsylvania, USA, 24–26 June 1998, pp. 1389–1394 (IEEE, New York).

14.

Minggao

Coordinated control of EGR and VNT in turbocharged diesel engine based on intake air mass observer. SAE paper 2002-01-1292, 2002.

15.

Zhao

Advanced direction injection combustion engine technologies and development, 2010 (Woodhead Publishing, Cambridge).

16.

Van Nieuwstadt

M. J.

Kolmanovsky

I. V.

Moraal

P. E.

Stefanopoulou

Janković

EGR–VGT control schemes: experimental comparison for a high-speed diesel engine. IEEE Control Systems Mag., 2000, 20(3), 64–79.

17.

Simani

Bonfe

Fuzzy modelling and control of the air system of a diesel engine. Adv. Fuzzy Systems, 2009, 1–14.

18.

Yoon

Sunwoo

A nonlinear dynamic modelling of SI engines for controller design. Int. J. Veh. Des., 2001, 26(2–3), 277–297.

19.

Kulkarni

A. M.

Shaver

G. M.

Popuri

S. S.

Frazier

T. R.

Stanton

D. W.

Computationally efficient whole-engine model of a Cummins 2007 turbocharged diesel engine. Trans. ASME, J. Engng Gas Turbines Power, 2010, 132(2), 1–9.

20.

Chung

Kim

Sunwoo

Nonlinear dynamic model of a turbocharged diesel engine. SAE paper 2005-01-0017, 2005.

21.

Astrom

Wittenmark

Adaptive control, 1994 (Addison-Wesley Longman, Boston, Massachusetts).

22.

Friedrich

Liu

C. S.

Oehlerking

Coordinated EGR-rate model-based controls of turbocharged diesel engines via an intake throttle and an EGR valve. In Proceedings of the 2009 IEEE Vehicle Power and Propulsion Conference (VPPC 09), Dearborn, Michigan, USA, 7–11 September 2009, pp. 340–347 (IEEE, New York).

23.

Alfieri

Amstutz

Guzzella

Gain-scheduled model-based feedback control of the air/fuel ratio in diesel engines. Control Engng Practice, 2009, 17(12), 1417–1425.

24.

Ogata

Modern control engineering, 1991 (Prentice-Hall, Englewood Cliffs, New Jersey).