Abstract
The ambient conditions in the emission measurement test procedure for light duty vehicles are defined as an almost constant temperature (23 deg C) and humidity (50 %RH). However, in the real driving situation, the temperature and humidity are widely dispersed, for example, high temperature and high humidity during the rainy season, and low temperature and low humidity during the winter season. Even during a real driving emission (RDE) test, the temperature and humidity are fluctuated. In this study, several couples of ambient conditions have been adopted for the emission measurements and the results are discussed from the effects on the vehicle and on the emission measurement system.
