Effects of methanol-gasoline blend on emission characteristics of gasoline engine in National Grade III standard
掺甲醇汽油对国Ⅲ汽油机排放性能影响

Three different ratios of methanol-gasoline blends, 0%, 15% and 50% of methanol in volume, were tested in an electronically controlled multi-point port injection gasoline engine. Fourier transform infrared (FTIR) spectrometers were used to detect the regular and irregular exhaust emissions before and after the conventional three-way catalyst. The measuring results showed that at the cold idling speed, the blends with methanol did not have any impact to NOx emission, but decreased CO and HC emissions as methanol percentage in the blends increased. Acetaldehyde decreased while formaldehyde and methanol emission increased. At warm idling speed, the blends with methanol did not have significant effects on pollutant emissions. While running at other operating conditions, CO and HC was reduced and NOx was only improved when methanol percentage in the blends was high. The side emissions of formaldehyde and methanol increased tremendously, while acetaldehyde decreased. All emissions were reduced close to zero level after reaction of TWC.