Application of EGR with DOC in vehicle diesel engine to comply with China IV emission regulation

To realize the large flow, cooled exhaust gas recirculation (L-CEGR) goal in vehicle diesel engine, the new emission control technology configuration consisting of newly developed diesel oxidation catalyst (DOC) and L-CEGR system was used in an 11-liter displacement engine. The test results show that: characterized by using electron-controlled variable geometry turbocharger (VGT), the L-CEGR reduces NOx by 28.6%, 160 MPa injection pressure and intake flow optimization can lower PM by 74.4%, DOC containing Pt of 0.55 g/unit can reduce the rest PM by 20%, the engine fully complies with China IV standards and NO2 limits, combination of L-CEGR and 160 MPa high pressure injection technology also reduces engine weighted average fuel consumption rate by 3.5%.