Method to meet new stringent NOx emission targets combining the double DEF injections after treatment architectures with a dedicated control strategy for diesel particulate filter regeneration

摘要

Diesel engine passenger car regulations impose stringent nitrogen oxide (NOx) emission requirements. The automotive industry is proposing different aftertreatment solutions to meet the stringent emission standards, such as combining Lean NOx Trap (LNT), selective catalyst reductant on filter (SCRF), underfloor selective catalyst reductant (SCR) and double DEF dosing system to better control conversion of the two SCR catalysts. In particular, in order to meet such stringent limits, every aftertreatment functionalities and engine working conditions must be optimized and carefully controlled.