Integration Simulation Of Diesle Vehicel Exhaust Control System Based On Selective Catalytic Reduction System

All kinds of Automobile exhaust regulations are becoming more and stricter because of the growing quantity of automobiles in the world. The contamination of diesel vehicles includes NOX, CO, HC and PM. In order to reduce and illuminate the contamination, different kinds of products are applied in diesel vehicles including Selective Catalytic Reduction system, Diesel Oxidation Catalyst system and Diesel Particular Filter system. Each system can only deal with one single type of contamination which is not enough. In order to control all the contamination, integration of the three systems is needed. This paper explained the methodology of SCR system, DOC system and DPF system in terms of operating principle, structure, characteristic of catalyst with advantages and disadvantages. With the application of Matlab Simulink software, the exhaust control system could be built and simulated as well as the original engine exhaust model. To improve the accuracy of the model, exhaust experiment of the diesel engine is designed and executed to collect the data of engine and each system under the condition of ETC. The experiment data is processed and used in the model to make it more accurate. The three systems are integrated and put into two different layouts. Simulation is run out based on two layouts according to the ETC conditions. The contamination data is collected, processed accordingly and compared under each circumstance with root cause analysis. Based on the result, it is found that integration with SCR system in front is more beneficial to reduce NOX, while harmful for reduction of PM. Integration with SCR system at back is more beneficial for the recycle of DPF system.