An Artificial Neural Network Model to Predict Efficiency and Emissions of a Gasoline Engine
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussions
4. Summary and Conclusions
- In order to achieve better prediction results, this study compared the prediction results of three different ANN model structures (including 3-7-6, 3-7-7-6, and 3-5-5-6), and the results showed that among these three prediction results, the lowest R2 of the prediction results of 3-7-7-6 basically remained around ≈0.98, which was higher than the R2 of the other two ANN models. Almost metrics predicted less RMSE values than those of the other two structures, which indicates that a 3-7-7-6 neuron network can achieve the better prediction results for each parameter (including power, emission, and phasing indicators).
- Using three types of variables (including six parameters) as output parameters and spark timing, speed, and intake pressure as input indicators with one ANN model, this can achieve good prediction results with close-to-unity R2 and relatively small RMSE. In the future, the whole vehicle only needs one controller in the optimization of powertrain system control strategies, and the results indicated the integration is possible.
- For the testing dataset, the ANN model can learn the trends between inputs and engine responses, which indicates that ANN can learn some internal intrinsic connections, which may be because some parameters of the chain chemical reaction can be learned by ANN. Therefore, the future ML model can be used to assist the engine design in the future.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Abbreviations
1D | One-Dimensional |
ATDC | After Top Dead Center |
ANN | Artificial Neural Network |
BDT | Boosted Decision Tree |
BP | Back Propagation |
BSFC | Brake Specific Fuel Consumption |
CAD | Crank Angle Degree |
CA50 | 50% Burned Crank Angle |
CFD | Computational Fluid Dynamics |
CO | Carbon Monoxide |
EGT | Exhaust Gas Temperature |
ICEs | Internal Combustion Engines |
IMEP | Indicated Mean Effective Pressure |
ITE | Indicated Thermal Efficiency |
MBD | Model-Based Design |
MBT | Maximum Brake Torque |
ML | Machine Learning |
NOx | Nitrogen Oxides |
R2 | Coefficient of Determination |
RF | Random Forest |
RMSE | Root Mean Squared Error |
SI | Spark Ignition |
SSres | Sum of Squares Due to Regression |
SStot | Sum of squares Due to Error |
ST | Spark Timing |
SVR | Support Vector Regression |
UHC | Unburned Hydrocarbons |
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References | Algorithm | Output | Main Conclusions |
---|---|---|---|
[40] | ANN, GBDT, RF, SVR | Exhaust gas temperature (EGT) | ANN is most appropriate for predicting EGT but is more complex for hyperparameter tuning. |
[32] | K-nearest | Phase | Based on the unevenly distributed training set, the KNN model does not predict well. |
[41] | ANN | Peak pressure rise | The ANN model can predict the relationship between pressure-based parameters and key control variables. |
[42] | BDT | IMEP | The BDT model did not perform so well for low load operating conditions. |
[43] | ANN | Fuel lubricity | The proposed neuron network can predict the lubricity well, using other diesel fuel properties as inputs. |
[44] | ANN | Emissions | BP neural network can be used to predict emissions with the cetane number as the input parameter. |
[45] | ANN | Emissions | ANN can be used for engine exhaust emissions modeling. |
[46] | ANN | NOx | The ANN model is a good tool for NOx prediction if speed and torque are used as input parameters. |
[47] | ANN | Torque, BSFC | The ANN model is very accurate for power class parameter prediction, and the prediction performance and accuracy are very good. |
[48] | Neuron network | Thermodynamic properties | The gas thermodynamics properties can be evaluated with Elman neural network. |
Research Type | Single-Cylinder |
---|---|
Cycle | 4-stroke SI PFI |
Valves per cylinder | 2 |
Bore [mm] × Stroke [mm] | 86 × 86.07 |
Intake valve opens/closes | 9 CAD BTDC/84 CAD ABDC |
Exhaust valve opens/closes | 55 CAD BBDC/38 CAD ATDC |
Connecting rod length [mm] | 175 |
Piston cup diameter [mm] | 80 |
Piston cup depth [mm] | 5 |
Wrist pin to crank offset [mm] | 1 |
Compression ratio | 9.5 |
TDC clearance height [mm] | 1 |
ANN Structure | 3-7-6 | 3-7-7-6 | 3-5-5-6 |
---|---|---|---|
R2 (CA50) | 0.9956 | 0.9977 | 0.9907 |
R2 (CO emissions) | 0.9499 | 0.9828 | 0.9687 |
R2 (HC emissions) | 0.9751 | 0.9936 | 0.9755 |
R2 (NOx emissions) | 0.9650 | 0.9899 | 0.9316 |
R2 (IMEP) | 0.9838 | 0.9892 | 0.9923 |
R2 (ITE) | 0.9755 | 0.9914 | 0.9829 |
RMSE (CA50) | 0.8637 | 0.8353 | 1.2378 |
RMSE (CO emissions) | 1.8098 | 1.0507 | 1.4158 |
RMSE (HC emissions) | 0.7102 | 0.4659 | 0.7029 |
RMSE (NOx emissions) | 2.3187 | 1.3946 | 3.2367 |
RMSE (IMEP) | 0.2991 | 0.3060 | 0.2063 |
RMSE (ITE) | 0.5168 | 0.3225 | 0.4264 |
ANN Structure | 3-7-6 | 3-7-7-6 | 3-5-5-6 |
---|---|---|---|
R2 (CA50) | 0.9955 | 0.9978 | 0.9907 |
R2 (CO emissions) | 0.9462 | 0.9796 | 0.9719 |
R2 (HC emissions) | 0.9652 | 0.9878 | 0.9647 |
R2 (NOx emissions) | 0.9475 | 0.9807 | 0.9138 |
R2 (IMEP) | 0.9822 | 0.9875 | 0.9913 |
R2 (ITE) | 0.9724 | 0.9916 | 0.9860 |
RMSE (CA50) | 0.8931 | 0.8436 | 1.2541 |
RMSE (CO emissions) | 1.8429 | 1.1291 | 1.3253 |
RMSE (HC emissions) | 0.8997 | 0.6428 | 0.9041 |
RMSE (NOx emissions) | 3.0659 | 2.0126 | 3.9147 |
RMSE (IMEP) | 0.3057 | 0.3102 | 0.2131 |
RMSE (ITE) | 0.5688 | 0.3330 | 0.3999 |
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Yang, R.; Yan, Y.; Sun, X.; Wang, Q.; Zhang, Y.; Fu, J.; Liu, Z. An Artificial Neural Network Model to Predict Efficiency and Emissions of a Gasoline Engine. Processes 2022, 10, 204. https://doi.org/10.3390/pr10020204
Yang R, Yan Y, Sun X, Wang Q, Zhang Y, Fu J, Liu Z. An Artificial Neural Network Model to Predict Efficiency and Emissions of a Gasoline Engine. Processes. 2022; 10(2):204. https://doi.org/10.3390/pr10020204
Chicago/Turabian StyleYang, Ruomiao, Yuchao Yan, Xiaoxia Sun, Qifan Wang, Yu Zhang, Jiahong Fu, and Zhentao Liu. 2022. "An Artificial Neural Network Model to Predict Efficiency and Emissions of a Gasoline Engine" Processes 10, no. 2: 204. https://doi.org/10.3390/pr10020204
APA StyleYang, R., Yan, Y., Sun, X., Wang, Q., Zhang, Y., Fu, J., & Liu, Z. (2022). An Artificial Neural Network Model to Predict Efficiency and Emissions of a Gasoline Engine. Processes, 10(2), 204. https://doi.org/10.3390/pr10020204