Technical Paper
Comparative Evaluation of Engine Control Strategy on Regulated Emissions and Nano-Particle Characteristics of LPG Direct Injection (LPDI) Vehicle During the Cold Start and the Hot Phases in the FTP-75 Cycle
2014-04-01
2014-01-1232
To evaluate the potential of a dedicated LPG direct injection (LPDI) vehicle, we investigated several engine control parameters that are closely related to the characteristics of mixture preparation and nano-particle emissions. Many researches have pointed out that any amount of particle emissions from GDI vehicles were made during the cold start and cold transient phase. Therefore, in the study, four types of engine control strategies for the LPDI vehicle were applied to evaluate particle number (PN) concentration and regulated emissions in the cold start phase and the hot start phase under the FTP-75 cycle. The reduction rate of the PN concentration with LPG application reached approximately over 99% less than that of the GDI vehicle.
