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Individual Cylinder Control for Air-Fuel Ratio Cylinder Imbalance
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 14, 2015 by SAE International in United States
Annotation ability available
Recently emissions regulations are being strengthened. An air-fuel ratio cylinder imbalance causes emissions to increase due to universal exhaust gas oxygen (UEGO) sensor error or exhaust gas oxygen (EGO) sensor error. Various methods of reducing an air-fuel ratio cylinder imbalance have been developed. It is preferable for a control system to operate over a wide range of conditions. Our target is to expand the operating conditions from idling to high load conditions.
Our approach is to use both an UEGO sensor and a crank angle sensor. A two-revolution frequency component calculated from the UEGO sensor output signal and angular acceleration calculated from the crank angle sensor output signal are used to identify the cylinder where the air-fuel ratio error occurs. The detection result using the UEGO sensor precedes the detection result using the crank angle sensor when the engine is operated under a high load because the detection accuracy of the method using the UEGO sensor is higher under these conditions. On the other hand, the result using the crank angle sensor precedes the result using the UEGO sensor when the engine is operated at low engine speeds because the detection accuracy using the crank angle sensor is higher under these conditions. Consequently, it is possible to expand the control operating conditions.
Experimental results using a real car showed that the developed control method operated under most of the conditions in the Japanese test cycle (JC08 Hot) and reduced NOx emissions by 90% compared with a car without the developed control method where an air-fuel ratio cylinder imbalance occurred.
CitationNakagawa, S., Numata, A., and Hori, T., "Individual Cylinder Control for Air-Fuel Ratio Cylinder Imbalance," SAE Technical Paper 2015-01-1624, 2015, https://doi.org/10.4271/2015-01-1624.
- Hasegawa , Y. , Akazaki , S. , Komoriya , I. , Maki , H. et al. Individual Cylinder Air-Fuel Ratio Feedback Control Using an Observer SAE Technical Paper 940376 1994 10.4271/940376
- Kainz , J. and Smith , J. Individual Cylinder Fuel Control with a Switching Oxygen Sensor SAE Technical Paper 1999-01-0546 1999 10.4271/1999-01-0546
- Nakagawa , S. , Katogi , K. , and Oosuga , M. A New Air- Fuel Ratio Feed Back Control for ULEV/SULEV Standard SAE Technical Paper 2002-01-0194 2002 10.4271/2002-01-0194
- Smith , J. , Schulte , C. , and Cabush , D. Individual Cylinder Fuel Control for Imbalance Diagnosis SAE Technical Paper 2010-01-0157 2010 10.4271/2010-01-0157
- Krenus , R. and Costa , H. Individual Cylinder Fuel Control Application with a Switching Oxygen Sensor SAE Technical Paper 2010-36-0028 2010 10.4271/2010-36-0028
- Javaherian , H. , Brown , A. , and Nolan , M. Individual Cylinder Air-Fuel Ratio Control Part I: L3 and V6 Engine Applications SAE Technical Paper 2011-01-0695 2011 10.4271/2011-01-0695
- Wu , Z. and Wasacz , B. Estimation of Individual Cylinder Fuel Air Ratios from a Switching or Wide Range Oxygen Sensor for Engine Control and On-Board Diagnosis SAE Int. J. Engines 4 1 813 827 2011 10.4271/2011-01-0710
- Burkhard , J. Individual Cylinder Fuel Control for a Turbocharged Engine SAE Technical Paper 2014-01-1167 2014 10.4271/2014-01-1167
- Nakagawa , S. , Fukuchi , E. , and Numata , A. A New Diagnosis Method for an Air-Fuel Ratio Cylinder Imbalance SAE Technical Paper 2012-01-0718 2012 10.4271/2012-01-0718
- Williams , J. and Witter , M. Individual Cylinder IMEP Estimation Using Crankshaft Angular Velocity Measurements SAE Technical Paper 2001-01-0990 2001 10.4271/2001-01-0990
- Nakagawa , S. , Ichihara , T. , Katogi , K. , Kanetoshi , K. et al. Cold Start HC Reduction with Feedback Control Using a Crank Angle Sensor SAE Technical Paper 2008-01-1010 2008 10.4271/2008-01-1010
- Aoyama , Y. , Hasegawa , R. , Yamada , T. , Itoh , T. et al. Development of Closed-Loop Robust Control System for Diesel Engines - Combustion Monitoring by Crank Angular Velocity Analysis and its Applications - SAE Technical Paper 2012-01-1157 2012 10.4271/2012-01-1157