Scientific Development Research

In order to reduce the pressure of environment and resources, China began to advocate new energy vehicles. Hybrid electric vehicles, especially plug-in hybrid electric vehicles, have become a hot research and development area of new energy vehicles because they can better balance the cost, driving range and energy consumption. In view of gaseous pollutant Emission of plug-in hybrid vehicles during actual road driving, this paper adopts PEMS (Portable Emission Measurement System) to test the actual road driving Emission of a plug-in hybrid vehicle that meets the national five regulations. The emission difference between electric consumption mode and charging mode is analyzed. The results show that CO and HC emissions are higher in charging mode. The analysis reason is that the engine needs to charge the battery at the same time as providing power to the vehicle, which leads to the high load of the engine, the increase of fuel injection, the decrease of air-fuel ratio, and the inadequate fuel combustion, leading to a significant increase in emissions.

Plug-in hybrid electric vehicle; Vehicle emission testing; Power consumption mode; Charging mode; Emission characteristics