METHOD OF CONTROLLING THE OPERATION OF AN AFTERTREATMENT SYSTEM OF A MOTOR VEHICLE

A method and apparatus are disclosed for controlling the operation of an aftertreatment system (270) for a motor vehicle (105) having a Lean NOx Trap (LNT) (285) and a tail pipe (276) for conveying exhaust gasses from the LNT to the external environment. Values are calculated for a NOx content in the exhaust gasses flowing in the tail pipe and the quantity of NOx stored in the LNT. A DeNOx request index is calculated as a function of these values. A raw threshold value of the DeNOx request index is calculated as a function of a LNT temperature and of an exhaust gas mass flow. A corrected threshold value of the DeNOx request index is calculated as a function of the raw threshold value of the DeNOx request index and of a correction factor. A DeNOx regeneration is initiated when the calculated value of the DeNOx request index is larger than the corrected threshold value. 公开种控制机动车辆(105)的后处理系统(270)的操作的方法，后处理系统(270)包括贫NO捕获器(LNT)(285)和用于将排气从LNT(285)传送到外部环境的尾管(276)，方法包括的步骤是：计算第参数的值，其表示尾管中流动的排气中的NO含量；计算第二参数的值，其表示LNT中存