METHOD FOR CONTROLLING EXHAUST GAS RECIRCULATION SYSTEM OF VEHICLE

摘要

A method for controlling an exhaust gas recirculation (EGR) system includes a first step of determining whether the EGR system is in an operation section under an ignition-on state, a second step of calculating a catalyst deterioration index with catalyst deterioration-diagnosing logic in a section that is determined to be the operation section of the EGR system, and for sensing an occurrence of a misfire in an engine with misfire-sensing logic, a third step of deciding whether the catalyst deterioration index is abnormal on a basis of a first predetermined value and whether a frequency of the misfire is abnormal on basis of a preset value for a reference duration, and a fourth step of controlling an opening amount of an EGR valve based on the decision of the abnormality of both the catalyst deterioration index and the misfire frequency.

主权项

1. A method for controlling an exhaust gas recirculation (EGR) system by regulating a flow rate of a circulating exhaust gas with an electronic control unit (ECU) in a vehicle to which a catalyst and the EGR system are applied, the method comprising:
a first step of determining whether the EGR system is in an operation section under an ignition-on state; a second step of calculating a catalyst deterioration index with catalyst deterioration-diagnosing logic in a section that is determined to be the operation section of the EGR system, and for sensing an occurrence of a misfire in an engine with misfire-sensing logic; a third step of deciding whether the catalyst deterioration index calculated in the second step is abnormal on a basis of a first predetermined value and whether a frequency of the misfire is abnormal on basis of a preset value for a reference duration; and a fourth step of controlling an opening amount of an EGR valve based on the decision of the abnormality of both the catalyst deterioration index and the misfire frequency, as measured in the third step.