Experimental investigation on motor vehicle on-road pollutant emission and fuel consumption behavior

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Experimental investigation on motor vehicle on-road pollutant emission and fuel consumption behavior

 

Author: Wu, Liang
Title: Experimental investigation on motor vehicle on-road pollutant emission and fuel consumption behavior
Degree: M.Sc.
Year: 2010
Subject: Hong Kong Polytechnic University -- Dissertations
Automobiles -- Fuel consumption -- Analysis
Automobiles -- Motors -- Exhaust gas -- Analysis
Department: Dept. of Mechanical Engineering
Pages: xvi, 159 p. : ill. ; 30 cm.
InnoPac Record: http://library.polyu.edu.hk/record=b2353055
URI: http://theses.lib.polyu.edu.hk/handle/200/5530
Abstract: The present study is an experimental investigation on motor vehicle on-road pollutant emission and fuel consumption behaviour. It is an analysis on the effect of driving routes and driving modes on vehicular global emissions, global fuel consumption, instantaneous emissions and instantaneous fuel consumption. A 1.5 liter petrol car complying with Euro 4 emissions standard was driven in four routes: an Urban Driving Route, a Hilly Driving Route, a Highway Driving Route and a Mixed Urban and Sub-Urban Driving Route. The characteristic of trips in each route, in terms of speeds and proportion of time speed in different driving modes (acceleration, deceleration, cruising and idling) were compared. Different routes are found to have different trip characteristics. In this study, concentrations of CO, HC, and NOx were measured directly from the vehicle tailpipe, fuel consumption was measured by a fuel flow meter and vehicle speed was measured by a microwave speed sensor simultaneously. The effect of vehicle speed in different driving routes and modes of operation on fuel consumption and emissions were examined. This car satisfies Euro 4 emissions standards for CO, NOx and HC in all driving routes and driving conditions, except that the global CO emission factor in the Hilly Driving Route (HILLDR) exceeds the Euro 4 limit. The effects of operation modes (idling, acceleration, cruising and deceleration) on emissions and fuel consumption were examined. Acceleration and idling modes are the major contributor of emissions and fuel consumption. Emissions and fuel consumption are found to be affected by vehicle speed, as well as mode of operation, traffic condition and road grade. Further investigation shows that peaks in NOx emission are associated with fuel lean operation. Peaks in CO emission are associated with fast acceleration from the idling state. Peaks in HC emission are associated with peaks in fuel consumption. The vehicle specific power (VSP) approach was used to analyze the emissions and fuel consumption in two routes. The emission and fuel consumption increases with VSP in the Suburban Route which has almost zero road grades in the route. On the other hand, results are less orderly in the Hilly Route in which there are both uphill and downhill sections. The application of VSP in emission and fuel consumption analysis might need to be further explored.

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