Abstract:

Three real driving emission (RDE) tests were conducted in accordance with the China No 6 emission regulation of light-duty vehicle to understand the exhaust emission of hybrid vehicle under real driving by using a portable emission measurement system (PEMs) for the light duty plug-in hybrid electric vehicle (PHEV)
which met the China No 5 emission regulation’ requirements. The characteristics of emissions including CO, NO_x and particle number (PN) were investigated. The results show that emission results based on New European Driving Cycle (NEDC) meets the regulation requirements. However, for these three RDE tests, the emission conformity factor (CF) of PN is over the limitation of 2.1 at both of the city trip and total trip; while the CF of NO_x is lower than the limitation of 2.1, and that of CO sometimes surpasses 2.1. The emission peak appears at each engine start, CO, NO_x and PN emissions are very high during the rural and motorway trips because the engine is charging the battery besides powering the vehicle.

Key words: plug-in hybrid electric vehicle (PHEV) , pollutant emission ,  real driving emission (RDE) ,  emission
characteristics, conformity factor (CF)