| 摘要 |
The present invention relates to a method for controlling an emission aftertreatment apparatus for a vehicle, capable of satisfying emission regulations of the vehicle to be gradually strengthened. The purpose of the present invention is to provide the method for controlling an emission aftertreatment apparatus for a vehicle, capable of optimally controlling the emission of ammonia of LNT, and performing an optimized emission aftertreatment performance by additionally extending/maintaining the rich operation time after the time when signals of a front lambda sensor and a rear lambda sensor are identical (breakthrough point occurrence time). According to the present invention, the method for controlling an emission aftertreatment apparatus for a vehicle comprises: a step of detecting signals of a front lambda sensor, a rear lambda sensor, and a temperature sensor of an LNT when an engine is operated in a rich mode; a step of detecting the breakthrough point occurrence time (t_bt) between the two lambda sensors by comparing signals of the front lambda sensor and the rear lambda sensor; and a step of determining the optimal additional rich time (α) based on the breakthrough point occurrence time (t_bt) and the emission temperature detected by the temperature sensor. Therefore, the rich mode of an engine is extended and operated during the optimal additional rich time (α) after the breakthrough point occurrence time (t_bt). |
