PN Emission Measurements and Real-Driving-Emissions (RDE) Simulation on China 6 Light-Duty Gasoline Vehicles

As the China 6 light duty vehicle emission regulation is being implemented, PN becomes a challenge for vehicle type-approval emission tests. WLTC has replaced NEDC as the Type-I test cycle on the chassis dynamometer with more dynamic driving events. In addition, on-road RDE test is a challenge to calibrate the engine to meet tailpipe PN emissions because of the nature of the on-road conditions, i.e. varying ambient temperature, driving dynamics, altitude, etc. In response to China 6 requirements, GPF technology has been introduced. In this study, we pulled four China 6 compliant gasoline vehicles for the PN emission survey. The selected vehicles covered typical engine technologies including GDI/MPI with natural aspiration/turbo charger, representing the state of the art of the local engine capability. On one hand, it helps to build insight into the status of China 6 engine emission control technology through WLTC and RTS95 tests. On the other hand, a method aiming to generate a surrogate RDE cycle is developed based on the WLTC and RTS95 testing data. This method could be used to evaluate the vehicle RDE PN emission by a modeling approach and help to predict the vehicle PN emission performance after the RDE compliance in future.