CAJ | 학술논문

使用车载排放测试系统测试了北京市4种不同技术路线的14辆国V车辆的实际道路排放情况。结果表明，氧化催化器( DOC)能明显降低天然气公交车的CO排放，但其对THC的降排效果有待提高。采用EGR技术的天然气公交车在低速时NOx减排效果较柴油车好，但是高速时没有优势。使用SCR系统的柴油车CO和THC排放较低，但低速时NOx 排放较高。而天然气车由于排气温度较高，加装SCR系统后可有效降低NOx排放，效果最理想。天然气公交车的颗粒物质量排放远低于柴油车，但是由于稀释方式的影响，其核模态的颗粒物数量较多。
사용차재배방측시계통측시료북경시4충불동기술로선적14량국V차량적실제도로배방정황。결과표명，양화최화기( DOC)능명현강저천연기공교차적CO배방，단기대THC적강배효과유대제고。채용EGR기술적천연기공교차재저속시NOx감배효과교시유차호，단시고속시몰유우세。사용SCR계통적시유차CO화THC배방교저，단저속시NOx 배방교고。이천연기차유우배기온도교고，가장SCR계통후가유효강저NOx배방，효과최이상。천연기공교차적과립물질량배방원저우시유차，단시유우희석방식적영향，기핵모태적과립물수량교다。
[ Abstract] The real world emissions from 14 State-V buses with four different after-treatment technologies are measured with portable emission measurement system. The results show that diesel oxidation catalyst can appar-ently reduce the CO emission of CNG-fueled buses, but its effect of reducing THC emission need to be improved. The CNG-fueled buses adopting EGR technology have a better emission reduction effects than diesel buses at low speed but there is no superiority at high speeds. The diesel buses with SCR system have lower CO and THC emis-sions but their NOx emissions are relatively high at low speeds, while the CNG-fueled buses with SCR system can ef-fectively reduce NOx emission due to higher exhaust temperature, being the most ideal choice. The particulate mat-ter mass emissions of CNG-fueled buses are far lower than diesel buses, but due to the effects of the way of dilution they emit more particles in nucleation mode.