Effect of driving routes and driving modes on vehicular emissions and fuel consumption

Pao Yue-kong Library Electronic Theses Database

Effect of driving routes and driving modes on vehicular emissions and fuel consumption

 

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: Dept. of Mechanical Engineering
Pages: xv, 164 p. : ill. (some col.) ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2321813
URI: http://theses.lib.polyu.edu.hk/handle/200/3815
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.

Files in this item

Files Size Format
b23218137.pdf 14.66Mb PDF
Copyright Undertaking
As a bona fide Library user, I declare that:
  1. I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
  2. I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
  3. I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.

     

Quick Search

Browse

More Information