Abstract
As one of the selective technology for meeting the demand of diesel engine emission standard, SCR technology has been applied in China & Abroad widespreadly. In order to meet the stricter technical requirements and standard, it's more necessary to adopt the optimal SCR technology based on close-loop control system comparing the insufficient open-loop control system. This paper deals with a new research of the close-loop control on the SCR system. Considering the demand of SCR transient control, We have designed a variable structure controller based on the variable structure control theory and use the ETC transient experimental test data on a vehicle with SCR system, and a simulation is made for the controller at last. The simulation results indicate that the variable structure controller has a good robustness and quick-response capability and can adjust urea injecting quantity quickly in specified time, also it can ensure the NOx emission and the NH 3 leakage within the specified range to meet the emission standard.
Published Version
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