... .9NGignition mode ECU, sequential ignitionintake way turbochargedcooling method air-air intercoolingfuel mixing way premixing before superchargingcylinder arrangement 4-cylinder ... (kW, for 12 hours)KW40Biogas pressure (kPa)2-5.5kPapres. fluctuation (kPa)no more than 0.2kPaheat consumption ... (kPa)207-345steady-state speed regulation %no more than0.5%starting mode—DC, 24V cooling method—close-loop water ...