Characteristics of Exhaust Emissions of Two Wheel Motorcycle Based on the World Wide Motorcycle Testing Cycle for Euro 4 Standard in Indonesia

摘要

Good air quality is an absolute requirement that must be met to promote healthy lifestyle. Air pollution, however, can cause adverse effect on air quality. One of the main sources of air pollution comes from transportation sector. The unburned hydrocarbon (HC), carbon monoxide (CO), Oxides of Nitrogen (NO_x), smoke opacity, carbon dioxide (CO_2) and particulate matter (PM) are main constituents of the exhaust gas from vehicles. In order to reduce the emission from transportation sector and meet the requirement of Euro-4 emission threshold all new motorcycle has to undergo the World Wide MotorCycle Test Cycle (WMTC) which will be implemented in Indonesia. In addition to the level of CO, HC, NO_x and CO_2 emission parameters that must be maintained, it is necessary also to measure the level of particlulate emissions in the engine exhaust. Hence, the purpose to this study is to conduct emission measurements from a new type of motorcycle with a cylinder capacity larger than 250 cc, Bsed on the measurement results, it was found that the Euro-4 emission requirement for CO, HC, NO_x can be easily fulfilled. However, an in-depth measurement on Particulate Matter (PM) indicate that the motorcycle produced higher concentration of nano-particulates (particulate with size less than 2.5 μm). The number concentration of PM_(2.5) is around 734.08/cm~3, which is around 99 of the total particulate emission. Given this fact, the PM value should be be taken into account in determining roadworthy motor vehicles.