EXHAUST GAS PURIFYING SYSTEM FOR VEHICLE

摘要

An exhaust gas purifying system for a vehicle may include a three-way catalyst into which an exhaust gas from an engine is introduced, an SCR catalyst positioned downstream from the three-way catalyst and reducing NOx, an oxidizing catalyst positioned downstream from the three-way catalyst, a rear oxygen sensor positioned behind the three-way catalyst and a controller receiving signals from the rear oxygen sensor and controlling a catalyst purge, where the controller ends the catalyst purge while the signals still show a lean state, after starting the catalyst purge following end of a fuel-cut.

主权项

1. An exhaust gas purifying system for a vehicle, comprising:
a three-way catalyst into which an exhaust gas from an engine is introduced; an SCR catalyst positioned downstream from the three-way catalyst and reducing NOx; an oxidizing catalyst positioned downstream from the three-way catalyst; a rear oxygen sensor positioned behind the three-way catalyst; and a controller receiving signals from the rear oxygen sensor and controlling a catalyst purge; wherein the controller ends the catalyst purge while the signals still show a lean state after starting the catalyst purge following end of a fuel-cut.