Vehicle-specific emissions modeling based upon on-road measurements.

摘要: Vehicle-specific microscale fuel use and emissions rate models are developed based upon real-world hot-stabilized tailpipe measurements made using a portable measurement system. Consecutive averaging periods of one to three multiples the response time used compare two semiempirical physically modeling schemes. One scheme is on internally observable variables (IOVs), such as engine speed manifold absolute pressure, while other externally (EOVs), speed, acceleration, road grade. For NO, HC, CO emission rates, average R2 ranged from 0.41 0.66 for former 0.17 0.30 latter. The EOV have CO2 0.43 0.79 versus 0.99 IOV models. sensitive episodic events in driving cycles high acceleration. Intervehicle fleet approaches compared; account variations that might be useful some types assessme...