Author(s)

L. Pelkmans, D. De Keukeleere & G. Lenaers

Abstract

In the frame of the 1EA-AMF project "Real Impact of New Technologies for Heavy Duty Vehicles", three state-of-the-art city bus technologies were evaluated for fuel consumption and emissions in real city traffic and in a number of test cycles, both on engine and on vehicle level. The three buses were a diesel bus, a natural gas bus with stoichiometric fuel control and three-way catalyst, and a natural gas bus with lean burn fuel control. The paper will compare fuel consumption and emissions of the three buses measured in real-city traffic using Vito's VOEM measurement system. The measurements showed that the natural gas buses had clearly higher fuel consumption (in diesel equivalents) than the diesel bus, caused by the lower average engine efficiency.

Keywords