Biomass resources are effective energy sources against global warming. In order to utilize biomass resources effectively, the automotive engine as a small-distributed generation system is one of the effective methods. In this study, a small size engine fueled by biomass gas based on automotive engine has been realized. Operating experiment fueled by low calorie gas simulating biomass gas gave knowledge about combustion characteristics and requirement for stable operation. 26% thermal efficiency was accomplished under appropriate conditions. An engine plant fueled by real biomass gas supplied from gasifying plant generated 19kW at its maximum. Then, auto control program was applied to the system. The control of air-fuel ratio and ignition timings realized stable rotational speed and power generation.
