On-road emissions and fuel consumption analysis of gasoline vehicles

Pao Yue-kong Library Electronic Theses Database

On-road emissions and fuel consumption analysis of gasoline vehicles


Author: So, Che-hong Wilson
Title: On-road emissions and fuel consumption analysis of gasoline vehicles
Degree: M.Sc.
Year: 1999
Subject: Motor vehicles -- Fuel consumption
Motor vehicles -- Motors -- Exhaust gas
Automobiles -- Motors -- Exhaust gas
Motor vehicles -- Environmental aspects -- China -- Hong Kong
Automobiles -- China -- Hong Kong -- Environmental aspects
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Mechanical Engineering
Pages: 129 leaves : ill. (some col.), map ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1479184
URI: http://theses.lib.polyu.edu.hk/handle/200/1370
Abstract: It is important to control and reduce the emissions from vehicles. To achieve this goal effectively, it is essential to know the actual emission from the on-road vehicles. This report provides an overview of methods that may be used to describe the on-road traffic emissions behavior. The emission analysis performed in this report is divided into 2 stages-Macroscopic Analysis and Microscopic Analysis. In the macroscopic stage, the global performances of selected vehicles over particular trips in Hong Kong have been analyzed. This mainly evaluates the emissions and fuel consumption of the vehicles in that particular trip. The global performances of each trip are compared to each other and hence pointed out the significance. Besides, global performance over each driving segment has also been investigated. Moreover, in this macroscopic analysis, effect of idling on emissions and fuel consumption is also investigated. The second stage of this study is the Microscopic Analysis. This is another approach to analyze the vehicle emissions relating to the instantaneous vehicle speed and vehicle acceleration. Firstly, just consider the instantaneous vehicle speed and see how it relates to the emissions. Then, both instantaneous vehicle speed and acceleration are used for analyzing the emissions. Therefore, the significance of considering one more independent variable can be observed. Finally, emission and fuel consumption are predicted from simulated result. Emission factor prediction using instantaneous vehicle speed is demonstrated. Functions using instantaneous engine speed as independent variable are used to estimate the emissions of a gasoline car. By applying the similar prediction method, both engine speed and engine acceleration are used to predict the emissions. So, the effect of using one more independent variable can be observed. Since a Hong Kong driving cycle [1] is developed, results obtained in the instantaneous performance analysis can be used to map with this Hong Kong driving cycle and hence find out the emissions and fuel consumption of the particular vehicle runs in Hong Kong. Also, emission predictions of well-know driving cycles developed in other countries are evaluated for comparison. The emission and fuel consumption are found to be higher under the Hong Kong cycle than these of the other countries.

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