Search Results

An analyzer for real-time measure of sulfur compounds in vehicle exhaust gas has been developed utilizing the Ultra Violet Fluorescence (UVF) detection technology. This analyzer measures Total Sulfur (TS) including sulfates in PM. For detecting sulfur components as TS, sample gas is introduced into two combustion furnaces. The TS measurement by the UVF analyzer is considered to be applicable to real-time oil consumption test with sulfur tracing method, because it has high sensitivity and quick response. In this study, the UVF method is evaluated in detail based on the vehicle emission test results.

Nitrous oxide (N₂O) emission reduction has gained large prominence recently due to its contribution to the climate change as a greenhouse gas. The United States Environment Protection Agency (US-EPA) together with the United States Department of Transport (DOT) has already regulated the N₂O emissions from light-duty vehicles (LDV) to 0.010 g/mile. For LDV, N₂O measurement should be done from sample storage bags over the light-duty FTP drive cycles. N₂O emission standard of 0.10 g/bhp-hr for heavy-duty engines (HDE) is also finalized. The final N₂O standard becomes effective in 2014 model year for diesel engines. Usually raw or diluted exhaust is measured for HDE emission testing. Therefore, an analyzer capable of measuring N₂O from bag and from diluted sample continuously is required to support both LDV and HDE regulations.