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International Journal of Automotive Technology 2009;10(2): 251-264. |
| DEVELOPMENT OF A DRIVING CYCLE FOR THE MEASUREMENT OF FUEL CONSUMPTION AND EXHAUST EMISSIONS OF AUTOMOBILES IN BANGKOK DURING PEAK PERIODS |
| S. TAMSANYA, S. CHUNGPAIBULPATANA, B. LIMMEECHOKCHAI |
| Thammasat University |
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| ABSTRACT |
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The exhaust emissions and fuel consumption rate of newly registered automobiles in Thailand are assessed using the standard driving cycle under Economic Commission of Europe(ECE). Because of the highly different driving conditions, the assessment results may not reflect realistic amounts of emissions and fuel consumption of the vehicles under Bangkok traffic which is well known for its congestion. The objective of this study is therefore to develop a new driving cycle for vehicles traveling in Bangkok main roads during peak hours. This paper firstly presents the development of method for selecting representative road routes of which traffic conditions can be representatives of the whole Bangkok traffic for conducting real-world driving speed data collection. This real-world data is obtained by driving a car equipped with a speed-time data logger along those selected road routes. Several driving characteristics including various profiles of microtrips are analyzed from the collected speed-time data and a number of target driving parameters are then defined for uses as a set of criteria for justifying the best cycle in the process of driving cycle establishment. The procedure for generating driving cycles from the analyzed real-driving data is also developed and the method to select the cycle that is best representative to Bangkok traffic is described. Comparisons found in the study show that the target driving parameters of the newly developed driving cycle are much closer to those obtained from the real-world measured data than those calculated from the presently adopted European drive cycle. This would imply that the obtained driving cycle will produce more realistic results in the emissions and fuel consumption assessment tests on vehicles traveling in Bangkok. The methods developed in this study for road route selection and driving cycle construction can be easily adopted by other big cities to develop their own vehicle driving cycles. Furthermore, although the developed methods are for passenger cars, similar approaches can be applied to develop driving cycles for other types of vehicle such as city buses and pick-up trucks. |
| Key Words:
Driving cycle, Driving pattern, Driving characteristics, Exhaust emissions, Fuel consumption |
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