Abstract:

Gasoline particle filter (GPF) is one of the most effective potential particulate emission limit technology for a direct injection gasoline (GDI) engine along with the increasingly stringent national regulations version 6 about emissions. This paper investigated the effect of speed and load variation on the emission characteristics of engine particle number (PN) and the effect of GPF capture efficiency under different temperatures using a test equipment of portable emission measurement system (PEMS) in a 2.0T GDI engine equipped with a GPF. The results showed that the total particle number (PN) concentration of GDI gasoline
engine has a trend of "U", which increases sharply after the increase of load, and the PN concentration in the GPF is higher than that before the GPF. The accumulation of ash layer increases the interception and deposition of the mechanism of the particulate filter of the gasoline engine, deep bed filtration regime enhances and the filtering efficiency increases.

Key words: gasoline direct injection (GDI) engines, gasoline particle filter (GPF), portable emission measurement system (PEMS), particle number (PN), filtering efficiency