Author: Mou, Yun-nin
Title: Effect of driving routes and driving modes on vehicular emissions and fuel consumption
Degree: M.Sc.
Year: 2009
Subject: Hong Kong Polytechnic University -- Dissertations.
Automobiles -- Pollution control devices.
Automobiles -- Motors -- Exhaust gas.
Automobiles -- Fuel consumption.
Automobile driving.
Department: Department of Mechanical Engineering
Pages: xv, 164 p. : ill. (some col.) ; 30 cm.
Language: English
Abstract: The present study 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. Hong Kong Driving Cycle Standards are reviewed on sub-urban driving condition and urban driving condition. Moreover, we create a driving route in urban driving condition with uphill and downhill operation, and this route is called urban-hilly route. Comparison has been made between selected driving routes and cycle standards, and those driving routes characteristic results proved that they are suitable to represent urban and sub-urban driving conditions, and effective in emissions and fuel consumption measurement. The concentrations of CO, HC and NOx were measured directly from the vehicle tailpipe, fuel consumption was measured by fuel flow meter and vehicle speed was measured by microwave speed sensor simultaneously. The effect of vehicle speed in different driving cycles and mode of operations on fuel consumption and global emissions were examined. The global emission of CO is highest in urban hill mode while global emission of NOx is highest in urban driving condition and global emission of HC is highest in sub-urban driving condition. Fuel consumption rate is highest in sub-urban driving condition but fuel consumption factor (in g/km) is highest in urban hill mode. Fuel consumption, CO and HC emissions have exponential decay function with increase of vehicle speed in urban and sub-urban driving condition, but such relationship does not hold in urban hill mode. NOx emission is relative stable at low level in urban hill and sub-urban driving condition but more peaks were noticed in urban driving condition because of low conversion efficiency of three way catalytic converter. The effects of operation modes, namely idling, acceleration, cruising and deceleration on emissions were examined. Idling effect was extracted for individual discussion and the results show that emission rates (in g/s) for CO, HC and NOx and emission factors (in g/kg) for CO and NOx are highest in urban driving condition but emission factor for HC is highest in sub-urban driving cycle. No matter for any driving cycles, fuel consumption rate (in g/s) at idling is nearly the same. The fuel consumption and emissions are highest in acceleration, but emissions curve of cruising and deceleration are twisting together as the vehicle speed increase, but such relationship is not hold for urban hill mode. There are some common peaks for NOx emissions at 3Q-35km/hr for acceleration in urban hill mode and urban driving condition; and 50-55km/hr for cruising in urban hill mode and urban driving condition.
Rights: All rights reserved
Access: restricted access

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