METHOD AND SYSTEM FOR EXHAUST EMISSION CONTROL

摘要

The present invention relates to a method and a system for regulating a temperature T DPF in a particle filter which is situated downstream of an oxidation catalyst in an exhaust cleaning system and has an inlet temperature T in_DPF which is determined at a point between said oxidation catalyst and said particle filter. According to the present invention, a relationship is defined between said inlet temperature T in_DPF to said particle filter and said temperature T DPF in said particle filter and depends on an amount of fuel which passes unburnt through said oxidation catalyst. Said inlet temperature T in_DPF to said particle filter is then regulated on the basis of said relationship so that said temperature T DPF in the particle filter is kept substantially around a predetermined target level for a defined period of time.