Abstract
KEYWORDS – SDPF(SCR coated DPF), EU6C(Emission regulation), LNT(Lean NOx trap),SCR(Selective Catalytic Reduction), CF(Compliance Factor), RDE(Random Driving Emission), PEMS(Portable Emission Measurement System)
ABSTRACT –
Recently European Union and North America regions tighten up emission regulation. Especially EU6C regulation is not fixed yet, but we expect that especially it’s too difficult to be satisfied with NOx emission regulation using current after-treatment system (NSC and DPF). Recent results from other researchers need to apply additional after-treatment system such as Selective Catalyst Reduction or SDPF.
In this study, we investigate additional NOx conversion without SCR catalyst. When LNT+DPF+SCR combined after system apply, it should need additional hardware and software such as urea dosing injector, supply pump, dosing control unit and DCU mapping. But when LNT+DPF apply, it does not need additional hardware and software. So we reduce development cost and time. So we focus on developing high performance LNT catalyst.
In this study used bench aged catalyst which were equivalent to 160k full useful life. In chassis dynamometer, we perform NEDC test cycle at first for screening test of EU6 regulation and perform WLTC version 5. test cycle for finding out optimized and high performance NOx conversion LNT. In engine dynamometer, we perform NOx storage test for checking absorption performance of low temperature. So we can develop LNT+DPF after-treatment system without SCR for EU6C regulation.