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| Research on the Temperature Window of SCR Catalyst Dynamic Conversion Efficiency on the ESC Test |
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| Key Words:IC engine SCR catalyst dynamic conversion efficiency temperature window |
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| Abstract:In order to establish the relationship between the SCR bench evaluation results and the emission reduction effect on the ESC test, the dynamic conversion efficiency test of a SRC catalyst was carried out to drew the temperature window of SCR catalyst conversion efficiency temperature window based on the reaction equilibrium time from which the dependence of the development process of a catalyst dynamic conversion efficiency on the reaction equilibrium time was obtained at different reaction temperatures. Based on the characteristic analysis of the engine exhaust conditions during the rapid of emission sampling window, the development characteristics of a SCR catalyst dynamic conversion efficiency test was studied on the ESC test and a temperature window representation method based on this catalyst dynamic conversion efficiency was proposed. Moreover the test evaluation condition of temperature window and the simulation adjustment method of temperature window simulation based on the actual NSR control strategy were analyzed and the temperature window was used to predict the emissions on the ESC test. Results show that the difference between the ESC emissions predicted by temperature window and the measured values is less than 8%. |
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