In order to improve the emission control quality of diesel engine selective catalytic reduction(SCR)unit un-der transient operating conditions,a nonlinear active disturbance rejection control system was designed for SCR unit and op-timization of nonlinear feedback gain was carried out based on improved particle swarm optimization algorithm.The results show that compared with the previous nonlinear feedback gain,the nonlinear feedback gain adjusted by the improved al-gorithm improves the robustness of the control system,and the calibrated nonlinear feedback gain can increase the accuracy of NOx emission control by 1.5％and shorten the transition process time by 11％.
维普
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