ANALYSIS OF THE INFLUENCE OF VEHICLE WEIGHT AND IDLE TIME ON EMISSIONS AND FUEL CONSUMPTION USING A MICROSIMULATION MODEL

• Main Author: Aqil Attami, Muhamad
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/87667
• Institution: Institut Teknologi Bandung

The transportation sector contributes 25% to emissions in Indonesia, with carbon monoxide (CO) accounting for 76,4% of this contribution. The tendency of Bandung residents to use motor vehicles remains high, as evidenced by the vehicle-to-population ratio nearing 1. Consequently, traffic congestion frequently occurs in specific areas and times, resulting in increased vehicle emissions and fuel consumption. Vehicle emissions are influenced by speed, type, and volume of vehicles. Other studies have indicated that emissions are also affected by fuel type, cumulative trip counts, speed, as well as vehicle acceleration and deceleration, where acceleration and deceleration represent driving behaviors that significantly impact emissions. Furthermore, CO? emissions are higher at high engine rpm, while CO emissions are more substantial during low engine rpm (idle). Another study suggests that overloading in freight vehicles has a more significant effect on increasing CO? emissions compared to CO emissions. Previous studies estimated emissions using macro models based on average vehicle speed and travel distance. This study estimates vehicle emissions and fuel consumption at intersections using instantaneous speed and acceleration data through several emission models, focusing on the Power-Based Model. Calculations were performed with the aid of the VISSIM microsimulation model to generate second-by-second individual vehicle speed and acceleration data over a one-hour simulation. The study aims to assess the impact of idle time and vehicle weight on CO, CO? emissions, and fuel consumption. The results indicate that idle time increases CO emissions by up to 26,71%, CO? emissions by up to 17,43%, and fuel consumption by up to 17,53% compared to baseline conditions. Meanwhile, increased total vehicle weight raises CO emissions by up to 117,82%, CO? emissions by up to 84,44%, and fuel consumption by up to 84,55% from baseline conditions.