| Title | Review and Improvement of Model for Energy Consumption and Greenhouse Gas (GHG) Emissions for Buses by Using an Enlarged Database |
| Dept | Transportation Planning and Land Transport Division |
| Year | 2015 |
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| Summary | The Institute of Transportation (IOT) has made considerable efforts in integrating the model with transportation planning tools for evaluating energy/CO2 emission consequences resulting from various transportation policies. This study continues the efforts of a series of projects titled, “A Study on the Relation Analysis Between Energy Consumption, Emissions and Transportation Planning”, which established relationships between fuel consumption/green house gas emission rates and traffic operation factors of small automobiles, large buses and motorcycles. An experiment with intercity buses was performed on National Freeway No.5 in 2010. Due to restrictions, a complete gradient mode could not be built. The focus of this year is to continue collecting energy/CO2 emission parameters of buses traveling on Freeway No.1, expand existing databases, and review and strengthen both practical estimation models. The combining of the estimation model with transport solutions/strategy assessment applications is expected to enhance the evaluation of carbon reduction ability in policies.
This study made the following contributions: The project team used the new technology of On-board Emissions Measurement Systems to collect about 9.6 thousand seconds of emissions data, which were used for building relationships between CO2 emissions, fuel consumption and instantaneous operating speeds of freeway bus by highway class. Due to the differences in operating conditions, we recommend adopting separate fuel consumption and CO2 emission estimate modals for freeway NO.1 and freeway NO.5. The National Freeway No.1 model established this year covers the slope range from -2% to 2%, which occupied 90% of National Freeway No.1’s segments. The on-road data between 60-90km/hr shows that uphill segments have the worst fuel-efficiency and downhill segments with the best fuel-efficiency. The fuel consumption rate is extremely high on long steep slopes. The fuel consumption rate and CO2 emission rate by county segments were provided to make calculation of fuel consumption and CO2 emissions of National Freeway easier. |
| Post date | 2015/10/27 |
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