Unregulated emissions characteristics of a gasoline direct injection vehicle fueled with methanol gasoline

A comparative study on unregulated emissions from a direct injection gasoline vehicle fueled with gasoline and M15 methanol-gasoline is conducted. Test cycles include a regulated cycle and three unregulated cycles simulating traffic conditions in Beijing. The results show that for each fuel, emissions of total aldehydes and ketones, major aldehydes and ketones and total BTEX (Benzene, Toluene, Ethylbenzene and Xylenes) over regulated cycle at hot start mode are lower than those at cold start mode. For each test cycle, formaldehyde emission with M15 is higher than that with gasoline. Emissions of total aldehydes and ketones, major aldehydes and ketones, formaldehyde and total BTEX with high speed cycle are the lowest among the four cycles at hot start mode.