| 摘要 |
The present invention relates to a dosing control method of an SCR system and an apparatus thereof. The dosing control method of an SCR system controls the amount of urea injected and a urea injection period using an exhaust flux logic in a dosing control unit (DCU) temporarily without on-board diagnostics (OBD) diagnosis, in order to prevent a misdiagnosis of the OBD in the DCU in case of a fault of the exhaust flux sensor, to facilitate normal driving of a vehicle, and to improve reliability of DCU control by solving customer complaint as to low speed driving of a vehicle. The dosing control method of the present invention includes: (a) a step of storing information on a temporal exhaust gas flux value in a storage unit; (b) a step of performing OBD diagnosis as to related sensors, and receiving a message as to the fault of a flux measurement sensor from an ECU; and (c) a step of determining the amount of urea injected and the injection period thereof using the information on the random exhaust gas flux value after the message is received. |
