This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A Comparative Study on Knock Occurrence for Different Fuel Octane Number
Technical Paper
2018-01-1674
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
Combustion with knock is an abnormal phenomenon which constrains the engine performance, thermal efficiency and longevity. The advance timing of the ignition system requires it to be updated with respect to fuel octane number variation. The production series engines are calibrated by the manufacturer to run with a special fuel octane number. In the experiment, the engine was operated at different speeds, loads, spark advance timings and consumed commercial gasoline with research octane numbers (RON) 95, 97 and 100. A 1-dimensional validated engine combustion model was run in the GT-Power software to simulate the engine conditions required to define the knock envelope at the same engine operation conditions as experiment. The knock intensity investigation due to spark advance sweep shows that combustion with noise was started after a specific advance ignition timing and the audible knock occur by increasing the advance timing. Therefore, the engine operation was divided into three regions; knock-free, light knock and heavy knock. The results for heavy-knock were well suited to audible knock detected by knock sensor. The simulation results from knock model divide the engine operation into two regions; normal combustion and knock region. The knock region was well suited to light-knock and heavy-knock which has been defined using experimental results. Next, an artificial neural network (ANN) model has been designed to classify the different RONs using engine rotational speed signal. The model classified different RONs accurately after starting point of noisy combustion (light-knock). This point defined from experimental results and was well suited with starting point of knock index increment from simulation results. The simulation tool ability to predict the knock envelope will reduce the experimental cost and time to generate the spark timing look-up table.
Recommended Content
| Technical Paper | A Parametric Study of Knock Control Strategies for a Bi-Fuel Engine |
| Technical Paper | Computational Study to Improve Thermal Efficiency of Spark Ignition Engine |
Authors
Topic
Citation
Ghanaati, A., Muhamad Said, M., and Mat Darus, I., "A Comparative Study on Knock Occurrence for Different Fuel Octane Number," SAE Technical Paper 2018-01-1674, 2018, https://doi.org/10.4271/2018-01-1674.Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| Unnamed Dataset 1 | ||
| Unnamed Dataset 2 | ||
| Unnamed Dataset 3 | ||
| Unnamed Dataset 4 | ||
| Unnamed Dataset 5 | ||
| Unnamed Dataset 6 |
Also In
References
- Ghanaati , A. , Muhamad Said , M.F. , and Darus , I.Z.M. Comparative Analysis of Different Engine Operating Parameters for On-Board Fuel Octane Number Classification Appl. Therm. Eng. 124 2017 10.1016/j.applthermaleng.2017.06.013
- Zhen , X. , Wang , Y. , Xu , S. , Zhu , Y. et al. The Engine Knock Analysis - An Overview Appl. Energy 92 628 636 2012 10.1016/j.apenergy.2011.11.079
- Daniels , C.F. , Zhu , G.G. , and Winkelman , J. Inaudible Knock and Partial-Burn Detection using In-Cylinder Ionization Signal SAE Technical Paper 2003-013149 2003 10.4271/2003-01-3149
- Checkel , M.D. and Dale , J.D. Pressure Trace Knock Measurement in a Current S.I. Production Engine SAE Technical Paper 2016-02-23 1989 10.4271/890243
- Ando , H. , Takemura , J. , and Koujina , E. A Knock Anticipating Strategy Basing on the Real-Time Combustion Mode Analysis SAE Technical Paper 2016-02-23 1989 10.4271/890882
- Spelina , J.M. , Peyton Jones , J.C. , and Frey , J. Recent Advances in Knock Analysis, Simulation, and Control SAE Int. J. Engines 7 2 947 955 2014 10.4271/2014-01-1349
- Burgdorf , K. and Denbratt , I. Comparison of Cylinder Pressure Based Knock Detection Methods SAE Technical Paper 972932 1997 10.4271/972932
- Siano , D. , Panza , M.A. , and D’Agostino , D. Knock Detection Based on MAPO Analysis, AR Model and Discrete Wavelet Transform Applied to the In-Cylinder Pressure Data: Results and Comparison SAE Int. J. Engines 8 1 1 13 2014 10.4271/2014-01-2547
- Leppard , W.R. Individual-Cylinder Knock Occurence and Intensity in Multicylinder Engines SAE Technical Paper 820074 1982 10.4271/820074
- Said , F.M.M. , Bin , A. , Aziz , A. , Latiff , Z.A. , and Andwari , A.M. Investigation of Cylinder Deactivation (CDA) Strategies on Part Load Conditions SAE Technical Paper 2014-01-2549 2014 10.4271/2014-01-2549
- Douaud , A. and Eyzat , P. Four-Octane-Number Method forPredicting the Anti-Knock Behavior of Fuels and Engines SAE Technical Paper 780080 294 308 1978 10.4271/780080
- Draper , C.S. 1935