Diesel engine with a long route exhaust gas recirculating (EGR) system and a lean NOx trap upstream of a diesel particulate filter (DPF)

摘要

Diesel engine 1 for a motor vehicle, the engine comprising a long route exhaust gas recirculating (LR-EGR) system 60, in which a Lean NOx Trap (LNT) 30 is located upstream of a diesel particulate filter (DPF) 31. The long route exhaust gas recirculating (LR-EGR) system 60 carries exhaust gases from a branching point 32 in the exhaust line 3 downstream of the DPF 31 to a leading point 22 in the intake line 2 upstream of the compressor 40 and charge air cooler 20. The engine may further comprise a short route EGR system (SR-EGR) 50. The LNT comprises a catalytic converter support, eg of ceramic material, coated with a catalytic washcoat. The LNT and DPF may share the same housing 33.