This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Development of a Control-Oriented Cylinder Air-Charge Model for Gasoline Engines with Dual Independent Cam Phasing
Technical Paper
2022-01-0414
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Cylinder air-charge is one of the most important parts of the torque control in a gasoline engine, due to the necessity to keep a stoichiometric air-fuel ratio, for the three-way catalyst to work efficiently. Throttle and phasing of the camshafts are actuators that have a big effect on the cylinder air-charge, this results in a cross-coupling between the actuators. One approach to handle the cross-coupling that occurs with multiple actuators is to use model predictive control (MPC), that handles the cross-coupling through the use of models and optimization. Models that support computation of gradients and hessians are desirable for use in MPC.
To support the model design experimental data of cylinder pressure, from an inline four-cylinder engine with dual independent cam phasing, supported by gas exchange simulation, the effects from variable valve timing on the cylinder air-charge are investigated during the valve overlap period. The analysis highlights the effect of a phase described using the path of the least resistance as having an inhibiting effect on the backflow of residual gases during the overlap period. Making the flow reversal over the exhaust valves an important event to keep track of the residual gases.
From the analysis of the effects on air-charge, a model is developed and proposed for the volumetric efficiency, the engine’s ability to fill the cylinders with fresh air. The model structure is derived using partial volumes, and it fits into the Mean Value Engine Model (MVEM) framework, making it is especially useful for control design. The model is validated against stationary measurements and the results show that the proposed model captures the important behaviors and changes in the air-charge related to the variable valve timing. Making it suitable for usage in an MPC framework.
Citation
Holmbom, R. and Eriksson, L., "Development of a Control-Oriented Cylinder Air-Charge Model for Gasoline Engines with Dual Independent Cam Phasing," SAE Technical Paper 2022-01-0414, 2022, https://doi.org/10.4271/2022-01-0414.Also In
References
- Heywood , J. Internal Combustion Engine Fundamentals 2E McGraw-Hill Education 2019
- Roth , D.B. Intake Valve Opening Optimization Tech. Rep., SAE Technical Paper 981028 1998 10.4271/981028
- Nouhov , D.F. and Chen , R. A Simulation Study on the Effect of Inlet Valve Opening on Performance of High Speed Engines 2002
- Mladek , M. and Onder , C.H. A Model for the Estimation of Inducted Air Mass and the Residual Gas Fraction using Cylinder Pressure Measurements SAE 2000 World Congress Mar 2000
- Ponti , F. , Piani , J. , and Suglia , R. Residual Gas Model for On-Line Estimation for Inlet and Exhaust Continuous VVT Engine Configuration IFAC Proceedings Volumes 37 22 2004 257 265
- Cho , H. , Lee , K. , Lee , J. , Yoo , J. et al. Measurements and Modeling of Residual Gas Fraction in SI Engines International Spring Fuels & Lubricants Meeting May 2001
- Martensson , J. and Flardh , O. Modeling the Effect of Variable Cam Phasing on Volumetric Efficiency, Scavenging and Torque Generation SAE 2010 World Congress & Exhibition Apr 2010
- Fox , J.W. , Cheng , W.K. , and Heywood , J.B. A Model for Predicting Residual Gas Fraction in Spark-Ignition Engines SAE Transactions 102 1993 1538 1544
- Leroy , T. , Alix , G. , Chauvin , J. , Duparchy , A. et al. Modeling Fresh Air Charge and Residual Gas Fraction on a Dual Independent Variable Valve Timing SI Engine SAE International Journal of Engines 1 apr 2008 627 635
- Höckerdal , E. , Orrling , S. , and Fantenberg , E. Cylinder Charge Estimation in Diesel Engines with Dual Independent Variable Valve Timing IFAC-PapersOnLine 52 5 2019 636 641 9th IFAC Symposium on Advances in Automotive Control AAC 2019
- Jiang , L. , Vanier , J. , Yilmaz , H. , and Stefanopoulou , A. Parameterization and Simulation for a Turbocharged Spark Ignition Direct Injection Engine with Variable Valve Timing SAE Technical Paper 2009-01-0680 2009 10.4271/2009-01-0680
- Cavina , N. , Siviero , C. , and Suglia , R. Residual Gas Fraction Estimation: Application to a GDI Engine with Variable Valve Timing and EGR SAE Transactions 113 2004 1774 1782
- Eriksson , L. and Nielsen , L. Modeling and Control of Engines and Drivelines Wiley 2014
- Blair , G.P. Design and Simulation of Four-Stroke Engines Society of Automotive Engineers 1999
- Holmbom , R. and Eriksson , L. Analysis and Development of Compact Models for Mass Flows Through Butterfly Throttle Valves WCX World Congress Experience Apr 2018
- Shen , T. and Ohata , A. Modeling and Control Design for Automotive Engines - with MATLAB Engine Simulator CD-ROM 2011
- Andersson , P. 2005
- Jankovic , M. and Magner , S.W. Cylinder Air-Charge Estimation for Advanced Intake Valve Operation in Variable Cam Timing Engines JSAE Review 22 4 2001 445 452