Emission control system designing of the GDI vehicle for China6 regulation
China6 is going to be implemented from Jul 1, 2020, and China6b limits decreased nearly half against China5, plus introduce PN limit, 6*1011#/kg, it is very challenge because of the stringent requirement. In this paper, one development stage vehicle, equipped with 1.5TGDI engine, was chosen for system designing. After calibration modification, 3 kinds of TWC systems with variable PGM loading, were evaluated and the middle proposal can pass the target under both fresh and engine aged condition. Moreover, GPF system was also introduced to further reduced particle emission. Compared to TWC system, GPF system maintain the comparable TWC performance, however achieved a 50% and nearly 95% filtration efficiency under fresh and aged condition separately, can fully meet China6b requirement. Finally, soot accumulation and regeneration in GPF were also investigated under variable ambient temperature and diving condition.