The emissions of carbon monoxide (CO), nitrogen oxides (NO(x)) and total hydrocarbon (THC) from 7 new and 12 in-use motorcycles with or without the catalyst were evaluated by testing these vehicles on a dynamometer. Also the concentrations of volatile organic compounds (VOCs) in five driving patterns, including idle, acceleration, 30 km h-1 cruise, 50 km h-1 cruise, and deceleration, were monitored. Experimental results indicate that the emissions of CO and THC from in-use motorcycles are significantly higher than new ones, but not for NO(x), and the emissions of THC from 2-stroke motorcycles are much higher than 4-stroke ones. The emissions of VOCs from in-use motorcycles are higher than new motorcycles for all five driving patterns, and those from 2-stroke engines are higher than 4-stroke motorcycles. Emission of VOCs in the modes of deceleration and idle accounts for the most mass emitted during the test driving cycle. (C) 2000 Elsevier Science Ltd.
All Science Journal Classification (ASJC) codes
- 環境科學 (全部)