This study proposes a fuzzy control bio-hydrogen internal combustion engine (ICE) generating system. The ICE technology is composed of thermodynamics, mechanical engineering, hydrodynamics, and electrical engineering. Bio-hydrogen can provide clean and efficient power instead of conventional fuels applied in an ICE. The two critical cores of hydrogen ICE generator are ignition time control which can precisely ignite air fuel mixtures to make generator output stable power and air fuel ratio control which can adjust output power to satisfy load demand. Fuzzy logic can provide precise control and response fast within various air fuel ratios. The study establishes a fuzzy control system with an output generator and an ICE with solenoid valve that controls bio-hydrogen injection. The experimental system successfully output stable power and carried out parameters of bio-hydrogen flow rate, air fuel ratio, injection pressure, and ignition timing. Parameters and experimental data are analyzed in the study and can be references for future development of the bio-hydrogen internal combustion engine generating system. Crown Copyright (C) 2010, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.