Abstract:

Reality driving emission (RDE) tests were carried out on loads in mountains and plains for diesel vehicles of the CHINA Phase V. The data of speed, altitude, NO_x and PN emission concentration, etc. were collected to investigate the influence of the slope of mountain road, the vehicle mass loads and the output power on NO_x and PN emissions of diesel vehicles. The results show that NO_x emission factors on mountain road with an average slope of about 6% are 20% at least higher than that on flat road, and PN emission factors are 20% at least lower than that on flat road. With the increased of gradient from 0 to 8%, NO_x emission concentrations increased by more than 1 times, and PN emission concentrations increased by 20%-60%. As the gradient increases further, NO_x and PN emission concentration increases slowly and then decreases. When the load increased, NO_x and PN emission concentrations increase. The emission rates of NO_x and PN are high in 10-40 kW region, and the high emission regions of NO_x and PN become wider with increased of load. The results can provide a reference for the setting of vehicle operating conditions for RDE test.

Key words: diesel vehicles, driving on mountain road, exhaust emission, nitrogen oxides (NO_x), particle number (PN), slope of mountain road, vehicle load