… TWC-SCR investigation is taken a step further to study NOx conversion and fuel efficiency
tradeoffs for lean … Though the HC effects are still in place for the SACI case, they are smaller in …

… ) TWC, an underbody (U/B) TWC, and an U/B SCR converter … tests while allowing lean
operation for improved fuel economy … conversion during the lean periods, the rich HC conversion …

… Upon switching to lean, NOX passes through the TWC and is … for lean gasoline engines
because it makes use of a TWC that … :NOX and lean/rich timing; HC conversion over the leanrich …

… The NOX, CO and HC conversion efficiency and the NH3 yield as a function of the
catalyst space velocity and the catalyst average temperature are shown in Figure 7 (a) and (b), …

… catalysts used in lean burn combustion engines. First, the … The model was built inside the
Virtual Engine Model VEMOD… simulation of internal combustion engines and their components. …

… TWC-SCR investigation is taken a step further to study NO x conversion and fuel efficiency
trade-offs for lean … , and through better control of engine-out HC. The previous work done on …

… of TWC+LNT/SCR systems to satisfy the Tier 2, Bin 2 emission standards for lean-burn
gasoline … The majority of the HC conversion is expected to occur within the CC TWC (and U/B …

… of TWC (intake of LNT) and downstream of LNT during the lean period are tabulated in Table
3. Due to the incomplete conversion of species on TWC at 350C, some of the CO, HC and …

… engine speed on the NOx emission level, NOx conversion … of the GDI engine lean-burn
technology with a TWC and LNT … There are various types of HC in gasoline engine exhaust …

… emissions from the combustion such as hydrocarbon (HC), carbon … For this study, only
lean-burn gasoline engine, TWC, and … engine mode from the lean to the rich while converting any …