Gas feed method for a gas engine or dual-fuel engine, and gas supply apparatus for same

A gas engine or dual-fuel engine of the type having no gas pressure control system in the gas feed, in which combustion gas (G) is burned with combustion air (L), with

• a source of pressurized combustion gas,
• a source of combustion air (L),
• a gas engine or dual-fuel engine having an inlet area,
• a pressure-balanced gas valve (1) provided immediately upstream of the inlet area of the gas engine or dual-fuel engine, the gas valve (1) supplying combustion gas (G) in the combustion air (L) upstream of the gas engine or dual-fuel engine,
• a gas feed (10) connecting the source of pressurized combustion gas to the gas valve (1), the gas feed (10) having no gas pressure control system for control of the gas pressure upstream of the gas valve (1) in dependence on the operating state of the gas engine or dual-fuel engine, and
• a gas pressure control system comprising control logic wherein a previously detected flow performance map of the gas valve (1) is stored, the control logic programmed to receive measurements during operation of the gas engine or dual-fuel engine including the pressure before and after the gas valve (1) as well as the temperature of the supplied combustion gas are measured, wherein at least one of the opening duration and the unblocked opening cross-sectional area of the gas valve (1) is controlled according to instantaneous measured values, the current engine operating point and the flow performance map independent of the actual pressure differential, wherein gas metering in the gas pressure control system occurs solely via precise control of the gas valve (1).