O2 purge control method and vehicle exhaust system for two type catalysts

摘要

An O2 purge control method for two type catalysts may include, performing, by a WCC O2 purge of a warm up catalytic converter (WCC), a sensor based WCC O2 purge logic to which a voltage of a WCC O2 sensor is applied immediately after a fuel-cut; and when the sensor based WCC O2 purge logic is completed, applying an O2ucc learning history and an O2uccReset of an O2ucc (oxygen quantity adsorbed into UCC) for an under floor catalytic converter (UCC) and performing, by any one of a factor based UCC O2 purge logic to which an engine RPM and an Fpurge of a purge oxygen suction quantity [mg] are applied and a sensor based UCC O2 purge logic to which a voltage value of an UCC O2 rear sensor is applied, an UCC O2 purge of the UCC.

主权项

1. An O2 purge control method for two type catalysts using a controller, comprising:
performing, by a WCC O2 purge of a warm up catalytic converter (WCC), a sensor based WCC O2 purge logic to which a voltage of a WCC O2 sensor is applied after a fuel-cut; and when the sensor based WCC O2 purge logic is completed, applying by the controller, an O2ucc learning history and an O2uccReset of an oxygen quantity (O2ucc) adsorbed into an under floor catalytic converter (UCC) for the UCC and performing, by one of a factor based UCC O2 purge logic to which an engine RPM and an Fpurge of a purge oxygen suction quantity are applied and a sensor based UCC O2 purge logic to which a voltage value of an UCC O2 rear sensor is applied, an UCC O2 purge of the UCC, wherein the O2ucc learning history is a case in which an UCC O2 purge logic is performed as the factor based UCC O2 purge logic at least once, and the Fpurge is a UCC O2 factor which is less than 1, wherein when the O2ucc learning history is not executed or even though the O2ucc learning history is executed, the O2uccReset is not executed, the sensor based UCC O2 purge logic is selected and performed, and when the O2ucc learning history is executed and the O2uccReset is executed, the factor based UCC O2 purge logic is selected and performed, wherein the factor based UCC O2 purge logic is progressed at a level at which oxygen purge quantity is an amount of oxygen suction quantity A×the Fpurge, and wherein the Fpurge is divided into the engine RPM and the purge oxygen suction quantity and defines a correlation between the engine RPM and the purge oxygen suction quantity.