| Neural Network-Based Prediction of NH3 Leakage from SCR Systems for Diesel Engines
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| Qiang Zhu , Jiehui Li |
| School of Automotive and Traffi c Engineering , Jiangsu University |
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| ABSTRACT |
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In selective catalytic reduction (SCR) systems, the urea injection control strategy is central to the control of NO x emissions.
When urea is over-injected, ammonia leakage will occur downstream of the SCR. A neural network-based NH 3 leakage
prediction model for diesel engine SCR systems is proposed in order that the dosing control unit (DCU) can reduce the
corresponding urea injection volume according to the NH 3 leakage when calculating the urea injection volume. Back propagation
(BP) neural network model and gated recurrent unit (GRU) model are developed respectively by code compilation
software to predict the NH 3 leakage. The genetic algorithm (GA) is used to fi nd the optimal parameters of the two diff erent
models. Bench tests are conducted to evaluate the model accuracy. Under historical test data, the root mean square errors
of the fi nal GA-BP and GA-GRU models are 3.142 ppm and 2.378 ppm, respectively. The percentage of cumulative NH 3
leakage prediction error of GA-BP and GA-GRU are 4.808% and 3.745%, respectively. The results show that the method of
using neural network for NH 3 leakage prediction is feasible, and GA-GRU model is better than GA-BP model in predicting
NH 3 leakage. This provides the basis for developing DCU to reduce NH 3 leakage. |
| Key Words:
Neural network · Urea injection · NH 3 leakage · SCR · Diesel engine
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Corresponding Author.
Jiehui Li , Email. 
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