The driving characteristics of Hanoi bus system and their impacts on the emission were determined. The obtained results show that the real–world driving characteristics are different for different bus routes and affect the emissions of vehicles. This paper, therefore, reconfirms the necessarity of the development of the typical driving cycle before conducting the emission inventory of mobile sources. | Journal of Science and Technology 55 (1) (2017) 74-83 DOI: THE DETERMINATION OF DRIVING CHARACTERISTICS OF HANOI BUS SYSTEM AND THEIR IMPACTS ON THE EMISSION Nguyen Thi Yen Lien1, 2, Nghiem Trung Dung1, * 1 2 Hanoi University of Science and Technology, 1 Dai Co Viet, Hanoi Hanoi University of Transport and Communication, 3 Cau Giay, Lang Thuong, Hanoi * Email: Received: 2 June 2016; Accepted for publication: 25 October 2016 ABSTRACT A GPS with the update rate of 1 Hz was used to collect the real–world driving data of the five bus routes of Hanoi, namely No. 9, 18, 25, 32 and 33, on weekdays and weekend. GPS data were processed and used to simulate the emission by IVE model. The driving characteristics of Hanoi bus system and their impacts on the emission were determined. The obtained results show that the real–world driving characteristics are different for different bus routes and affect the emissions of vehicles. This paper, therefore, reconfirms the necessarity of the development of the typical driving cycle before conducting the emission inventory of mobile sources. Keywords: driving behaviour, driving cycle, emission factor, Hanoi bus, IVE model. 1. INTRODUCTION Motor vehicles are one of the main sources of air pollutants in big cities, especially in developing countries. The emission of a vehicle is dependent on several factors including the type and age of the vehicle, air pollution control technologies used, the type and quality of fuel, ambient air conditions and its operating conditions (cold-start, steady-state cruise, acceleration, deceleration and idle), etc. The emission of a vehicle can be measured under controlled conditions in the laboratory (engine and chassis dynamometer studies) with the use of a driving cycle which is built based on real-world activity data. The driving cycle represents the relationship between the instantaneous speed and time of a on-road vehicle in certain .
