| Summary: | 碩士 === 大葉大學 === 環境工程學系碩士班 === 92 === The purpose of this study is to investigate the database of motorcycles from January 2003 to June 2003 in Taiwan. The database is divided into three groups to compare the emission characteristics of hydrocarbons and the related influential consistency factors under the motorcycle type and design factors. These three groups are including:
The first group consists of Taichung City, Hsinchu City, Chiayi City, Taipei City, Kaohsiung City, Tainan City, Keelung City. The second group consists of Changhua County, Kaohsiung County, Taipei County, Tainan County, Chiayi County, Taoyuan County, Hsinchu County, Taichung County. The third group consists of Miaoli County, Yilan County, Pingtung County, Taitung County, Nantou County, Penghu County, Hualien County, Yunlin County.
According to the analysis of the emission characteristics of hydrocarbons, the second group has the lowest mean, median, and the standard deviation in the three groups investigated. The percentages of the two-stroke engine motorcycle in the three groups were 55 , 49 , and 52 %, respectively. However, the contribution volumes of the hydrocarbons emitted from two- stroke engine motorcycle were 92, 91, and 91%. The percentages of the two-stroke 50 cc engine motorcycles in each group were 41, 34, and 34 %, respectively. But the contribution volumes were 69, 64, and 62%. Therefore, the two-stroke motorcycles emission is worth to pay attention.
The 97% of in-use motorcycles are tallied with the emission standards of hydrocarbons. About 3% of the two-stroke motorcycles are unqualified on the hydrocarbons exhaust concentration. Therefore, it is worth to pay attention with the two-stroke engine motorcycles, the 50 cc engine exhaust volume, and the date of production before 1997.
The concentration of hydrocarbons for the motorcycles can be described by the multiple regression equation as:.
1、The first model : Ŷ=214694.8+2742.4Ｘ1-105.3Ｘ2-30.0Ｘ3
2、The second model : Ŷ=427408.6+1210.1Ｘ1-212.1Ｘ2-8.53Ｘ3
Ŷ: the hydrocarbons exhaust concentration (ppm)
Ｘ1 : dummy variable is 1 for the two-stroke motorcycle
dummy variable is 0 for the four-stroke motorcycle
Ｘ2 : the date of production
Ｘ3 :the exhaust volume
|
|---|
