This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
An On-Line Model for Predicting Residual Gas Fraction by Measuring Intake/Exhaust and Cylinder Pressure in CAI Engine
Technical Paper
2008-01-0540
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
CAI (Controlled Auto Ignition) combustion is already well known to be advantageous over conventional cycles in that it facilitates higher engine efficiency and has low emission characteristics. The CAI combustion process is mainly governed by in-cylinder RGF (Residual Gas Fraction), therefore achieving good control of in-cylinder RGF is essential in the development of CAI combustion engine. Usually, in-cylinder RGF controlled via low lift cam, short valve duration and negative valve overlap. More importantly on the other hand, accurate and instantaneous prediction of RGF must be done as a prerequisite to control. However, on-line prediction of RGF is not always practical due to the requirement of expensive fast response exhaust gas analyzers in the empirical case or otherwise due to theoretical models which are just too slow for application by means of simulation solving. In this paper, a newly enhanced theoretical model for predicting on-line in-cylinder RGF is introduced. This enhanced model predicts an RGF value in less than five seconds for every engine cycle. A Fortran code for predicting RGF in a single cylinder CAI engine was developed using MOC (Method of Characteristics). The code takes in measured dynamic pressures of intake, exhaust and in-cylinder gases to generate a corresponding RGF figure in a few seconds. The code was then inserted into Labview DAQ system as a form of DLL (Dynamic Link Library) to make on-line prediction possible. This model has been verified in various speeds and valve timing conditions of CAI mode by comparing results with those of the commercial code GT-Power.
Recommended Content
Authors
- Seungmok Choi - School of Mechanical & Aerospace Engineering, Seoul National University
- Minyoung Ki - School of Mechanical & Aerospace Engineering, Seoul National University
- Kyoungdoug Min - School of Mechanical & Aerospace Engineering, Seoul National University
- Jinkook Kong - Hyundai Motor Company
- Kyoungjoon Chang - Hyundai Motor Company
- Kiyoung Kwon - Hyundai Motor Company
- Kiwook Shin - Hyundai Motor Company
Citation
Choi, S., Ki, M., Min, K., Kong, J. et al., "An On-Line Model for Predicting Residual Gas Fraction by Measuring Intake/Exhaust and Cylinder Pressure in CAI Engine," SAE Technical Paper 2008-01-0540, 2008, https://doi.org/10.4271/2008-01-0540.Also In
References
- Koopmans, L. Ogink, R. Denbratt, I. “Direct Gasoline Injection in the Negative Valve Overlap of Homogeneous Charged Compression Ignition Engines” SAE 2003-01-1854 , JSAE 20030195 2003
- Zhao, H. et al. “Understanding the Effect of Recycled Burnt Gases on the Controlled Auto Ignition (CAI) Combustion in Four-Stroke Gasoline Engines” SAE 2001-01-3607 2001
- Stanglmaier, R.H. Robets, C.E. “Homogeneous Charged Compression Ignition (HCCI): Benefits, Compromise and Future Applications” SAE 1999-01-3682 1999
- Ford Richard Collings Nick “Measurement of Residual Gas Fraction using a Fast Response NO sensor” SAE 1999-01-0208 1999
- Schwarz F. Spicher U. “Determination of Residual Gas Fraction in IC Engines” SAE 2003-01-3148 2003
- Amer Amer A. “A Semi-Empirical Model for Fast Residual Gas Fraction Estimation in Gasoline Engines” SAE 2006-01-3236 2006
- Liu Jing Ping Kleeberg Henning Tomazic Dean Ciaravino Joseph A. Amer Amer A. “A Model For On-Line Monitoring of In-Cylinder Residual Gas Fraction (RGF) and Mass Flowrate in Gasoline Engines” SAE 2006-01-0656 2006
- Benson Rowland S. Clarendon Press Oxford “The Thermodynamics and Gas Dynamics of Internal-Combustion Engines” 1982
- Burkhardt C. Gnielka M. et al. “Optimisation of Gas Exchange by a Suitable Combination of Indicating, Analysis and Simulation” 9th Symposium “The Working Process of the ICE” Technical University Graz 2003
- Witt A. Dr. Siersch, Schwarz “New Methods in the Development of The Pressure Analysis for Modern SI Engines” 7th Symposium “The Working Process of the ICE” Technical University Graz 1999
- Colin G. Giansetti P. Chamaillard Y. Higelin P. “In-Cylinder Mass Estimation Using Cylinder Pressure” SAE 2007-24-0049 2007