Emissions and fuel consumption of a Euro 4 car operating along different routes in Hong Kong

This paper analyzes the on-road emissions and fuel consumption of a Euro 4 petrol car driven on four typical urban routes in Hong Kong. The effects of road grade and traffic condition on the emissions and fuel consumption are examine and show that the hilly route has the greatest CO and HC emissions and the highest fuel consumption per unit distance traveled. The urban route is the second highest in CO emission and fuel consumption due to significant idling and low-speed operation, and the frequent acceleration and deceleration changes. It is also found that higher NOx emission is associated with deceleration events which cause lean operation while higher CO emission is associated with accelerating from idle which causes rich operation. HC and fuel consumption peaks are associated with acceleration.

Research highlights
► Tests of a Euro 4 car over four roués in Hong King show that hilly routes produce the greatest levels of CO and HC and consume the most fuel highest fuel.
► Traffic congestion results in increase of emissions and fuel consumption.
► Higher NOx emission are associated with deceleration and higher CO emissions with accelerating from idle.
► HC and fuel consumption peaks are associated with acceleration.