Abstract

Effect on gasoline engine emission characteristics of variable composition oxygen-enriched intake air

Author(s): Han Bing-yuan, Bei Shao-yi, Zhao Jing-bo, Feng Jun-Ping

In this paper, taking air-cooled, four-stroke, single cylinder gasoline engine as the research object, oxygen-enriched intake air systems and gasoline engine performance test bed was built. In the range of 21% to 26% enrichment ratio, based on MAP chart of variable component enriched intake, control parameters was adjusted according to the PWM principle, mixture gas of different oxygen and nitrogen components was prepared for the test engine. Under the conditions of different components intake air, an HC, CO and NOx emission characteristic of gasoline was comparatively analyzed through universal characteristic test. The results show that the lowest HC emissions and CO emissions under conditions of variable component of the oxygen-rich intake air were reduced by 17.59% and 17.14% compared with the normal intake, the lowest NOx emissions was 53 × 10-6, it increased 7.55%. Under conditions of variable component oxygen-rich intake air, HC and CO emissions of gasoline engine significantly reduced, NOx emissions deteriorated slightly, which improved relatively integrated emission performance of gasoline engine