This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Residual Gas Fraction Estimation: Application to a GDI Engine with Variable Valve Timing and EGR
Technical Paper
2004-01-2943
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The paper presents an original review and extension of existing mathematical models for on-line residual gas fraction estimation. The resulting model has first of all been extended to take into account also the presence of externally recirculated exhaust gas (external EGR), and then critically analyzed to highlight the importance of a correct Intake Valve Opening and Exhaust Valve Closing effective position identification. As shown in the paper, such quantities may be evaluated by using experimental data, either acquired in the test-cell or on a valve flow bench.
The main objective is to obtain a simple and reliable model (that could be run in real time within the engine control unit) also in presence of Variable Valve Timing (VVT, both on intake and exhaust valves) and external Exhaust Gas Recirculation (EGR) systems. In fact, the two main contributions to residual gas fraction (backflow of the burned gas during the valve overlap period, and amount of gas trapped within the cylinder) are strongly affected by intake and exhaust valves timing, and EGR flow should be taken into account in order to determine the total exhaust gas mass within the cylinder at IVC. Therefore, real time estimation of residual gas mass and composition is crucial for designing VVT and EGR management strategies that allow an optimal control of the combustion process.
The new model has been applied to experimental data acquired on a 3.2 liter V6 GDI engine, equipped with intake and exhaust Variable Valve Timing systems. Tests were performed throughout the engine operating range for different combinations of intake and exhaust valve timings, while varying EGR flow. Model results are in good agreement with other measured quantities (such as Spark Advance angle and NOx emissions), and the proposed approach therefore represents a powerful tool for on-board optimal combustion control.
Recommended Content
Authors
Topic
Citation
Cavina, N., Siviero, C., and Suglia, R., "Residual Gas Fraction Estimation: Application to a GDI Engine with Variable Valve Timing and EGR," SAE Technical Paper 2004-01-2943, 2004, https://doi.org/10.4271/2004-01-2943.Also In
SI Engine Performance and Additives, Gasoline Engine Cold Start, and Direct Injection
Number: SP-1895; Published: 2004-10-25
Number: SP-1895; Published: 2004-10-25
References
- Ford, R. Collings, N. Measurement of Residual Gas Fraction using a Fast Response NO Sensor SAE Technical Paper 1999-01-0208
- Johansson, B. Neij, H. Julin, G. Alden, M. Residual Gas Visualization with Laser Induced Fluorescence SAE Technical Paper 952463
- Hinze, P. C. Miles, P. C Quantitative Measurements of Residual and Fresh Charge Mixing in a Modern SI Engine Using Spontaneous Raman Scattering SAE Technical Paper 1999-01-1106
- Fox, J.W. Cheng W.K. Heywood J.B. A Model for predicting residual gas fraction in spark-ignition engines SAE Technical Paper 931025
- Senecal P. K. Xin J. Reitz R. D. Predictions of residual gas fraction in IC engines SAE Technical Paper 962052
- Mladek, M. Onder, C. H. A Model for the Estimation of Inducted Air Mass and the Residual Gas Fraction using Cylinder Pressure Measurements SAE Technical Paper 2000-01-0958
- Sandquist, H. Wallesten, J. Enwald, K. Stromberg, S. Influence of Valve Overlap Strategies on Residual Gas Fraction and Combustion in a Spark-Ignition Engine at Idle SAE Technical Paper 972936
- Heywood, J. B. Internal Combustion Engine Fundamentals Mc-Graw Hill International 1998
- Randolph, A. Methods of processing Cylinder-Pressure Transducer Signals to maximize Data Accuracy SAE Technical Paper 900170
- Burnt. M. F. Lucas, G. The Effect of Crank-angle Resolution on Cylinder Pressure Analysis SAE Technical Paper 910041
- Kuratle, R. Marki, B. Influencing Parameters and Error Sources during Indication on Internal Combustion Engines SAE Technical Paper 920233
- Puzinauskas, P. V. Eves, J. C. Tillman, N. F. Measuring Absolute Cylinder Pressure and Pressure Drop across Intake Valves of firing Engines SAE Technical Paper 941881
- Randolph, A. L. Cylinder-pressure-based Combustion Analysis in Race Engines SAE Technical Paper 942487
- Burnt, M. F. Pond, C. R. Evaluation of Techniques for Absolute Cylinder Pressure Correction SAE Technical Paper 970036