Device and method for reducing NOx through SCR two-stage urea injection for vehicle

The invention discloses a device and method for reducing NOx through automotive SCR two-stage urea injection, the method applies the device for reducing NOx through automotive SCR two-stage urea injection, and the method comprises the steps that tail gas firstly passes through an electric heating de...

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Hauptverfasser: GAO JIANBIN, ZHOU CHENGZHONG, XIAO GANG, WANG XIAOHUI, WANG HUI
Format: Patent
Sprache:chi ; eng
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Zusammenfassung:The invention discloses a device and method for reducing NOx through automotive SCR two-stage urea injection, the method applies the device for reducing NOx through automotive SCR two-stage urea injection, and the method comprises the steps that tail gas firstly passes through an electric heating device, then sequentially passes through ccSCR, DOC, CDPF and SCR/ASC and then is discharged; and the urea injection amount in the ccSCR is determined by the urea injection system according to the NOx concentration source, the NOx original emission model, the NOx sensor data and/or the ccSCR catalyst NO3 storage model, the ccSCR catalyst efficiency model, the exhaust flow model, the DPF active regeneration correction model, the DPF passive regeneration correction model, ccSCR catalyst urea injection, the ccSCR catalyst N2O/NOx proportion model and the ccSCR catalyst temperature model. According to the method, the technical requirements of cold-state circulation and low-load circulation of future regulations can be me