Browse > Article

A Study on Individual Cylinder Equivalence Ratio Estimation and Control Algorithm for SI Engines  

Kim, Jun-Soo (Department of Automotive Engineering, Graduate School of Hanyang University)
Oh, Seung-Suk (Department of Automotive Engineering, Graduate School of Hanyang University)
Lee, Min-Kwang (Department of Automotive Engineering, Hanyang University)
SunWoo, Myoung-Ho (Department of Automotive Engineering, Hanyang University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.19, no.5, 2011 , pp. 35-44 More about this Journal
Abstract
In a spark ignition engine, a variable valve lift (VVL) system has been developed for high fuel efficiency and low power loss. However, changes in valve lift cause deviations of cylinder air charge which lead to individual cylinder equivalence ratio maldistribution. In this study, in order to reduce the maldistribution, we propose individual cylinder equivalence ratio estimation and control algorithms. The estimation algorithm calculates the equivalence ratio of each cylinder by using a mathematical engine model which includes air charging, fuel film, exhaust gas, and universal exhaust gas oxygen sensor (UEGO) dynamics at various valve lifts. Based on the results of estimated equivalence ratio, the injection quantity of each cylinder is adjusted to control the individual cylinder equivalence ratio. Estimation and control performance are validated by engine experiments. Experimental results represented that the equivalence ratio maldistribution and variation are decreased by the proposed algorithms.
Keywords
Equivalence ratio maldistribution; Individual cylinder; VVL; Engine model; Equivalence ratio estimation; Equivalence ratio control;
Citations & Related Records
연도 인용수 순위
  • Reference
1 I. Kawasumi and Y. Yasui, "Adaptive Air-fuel Ratio Controls for Continuously Variable Valve Lift Gasoline Engines," SAE 2007-01-1198, 2007.
2 K. Min, "New Gasoline Engine Technology for the Future," Automotive Electronics Magazine, pp.34-41, 2009.
3 K. Ha, W. Kim, C. Lee, H. Kim, M. Choi and D. Han, "Developement of Continuously Variable Valve Lift (CVVL) Engine," 2008 Spring Conference Proceedings, KSAE, pp.70-75, 2008.
4 S. M. Begg, M. P. Hindle and T. Cowell, "Low Intake Valve Lift in a Port Fuel-injected Engine," Energy, Vol.34, No.12, pp.2042-2050, 2009.   DOI   ScienceOn
5 J. Kainz and J. Smith, "Individual Cylinder Fuel Control with a Switching Oxygen Sensor," SAE 1999-01-0546, 1999.
6 H. Kim, J. Kim and S. Kauh, "Individual Cylinder A/F Control Using Wide Band Oxygen Sensor," Spring Conference Proceedings, KSAE, pp.126-131, 1998.
7 L. Benvenuti, "Individual Cylinder Characteristic Estimation for a Spark Injection Engine," Automatica, Vol.39, No.7, pp.1157-1169, 2003.   DOI   ScienceOn
8 Y. Hasegawa, S. Akazaki, I. Komoriya, H. Maki, Y. Nishimura and T. Hirota, "Individual Cylinder Air-fuel Ratio Feedback Control Using an Observer," SAE 940376, 1994.
9 P. Yoon and M. Sunwoo, "A Nonlinear Dynamic Engine Modeling for Controller Design," Transactions of KSAE, Vol.7, No.7, pp.167-180, 1999.
10 M. Kwon, J. Kim, M. Lee, K. Lee and M. Sunwoo, "Development of a Cylinder Deactivation Engine Model for Mode Transition Control," Fall Conference Proceedings, KSAE, pp.77-83, 2008.
11 S. Regitz and N. Collings, "Fast Response Air-to-fuel Ratio Measurements Using a Novel Device Based on a Wide Band Lambda Sensor," Measurement Science and Technology, Vol.19, No.7, 2008.
12 K. Shin, S. Park, P. Yoon, N. Juong and M. Sunwoo, "A Study on the Improvement of Air-fuel Ratio Control Performance in SI Engine Using STR," Transactions of KSAE, Vol.9, No.6, pp.57-64, 2001.